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arXiv 2025年

作者： Aaij, R. Abdelmotteleb, A.s.W. Beteta, C. Abellan Abudinén, F. Ackernley, t. Adefisoye, A.A. Adeva, B. Adinolfi, M. Adlarson, P. Agapopoulou, C. Aidala, C.A. Ajaltouni, Z. Akar, s. Akiba, K. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Aliouche, Z. Cartelle, P. Alvarez Amalric, R. Amato, s. Amey, J.L. Amhis, Y. An, L. Anderlini, L. Andersson, M. Andreianov, A. Andreola, P. Andreotti, M. Andreou, D. Anelli, A. Ao, D. Archilli, F. Argenton, M. Cuendis, s. Arguedas Artamonov, A. Artuso, M. Aslanides, E. Da silva, R. Ataíde Atzeni, M. Audurier, B. Bacher, D. Perea, i. Bachiller Bachmann, s. Bachmayer, M. Back, J.J. Rodriguez, P. Baladron Balagura, V. Balboni, A. Baldini, W. Balzani, L. Bao, H. de souza Leite, J. Baptista Pretel, C. Barbero Barbetti, M. Barbosa, i.R. Barlow, R.J. Barnyakov, M. Barsuk, s. Barter, W. Bartolini, M. Bartz, J. Basels, J.M. Bashir, s. Bassi, G. Batsukh, B. Battista, P.B. Bay, A. Beck, A. Becker, M. Bedeschi, F. Bediaga, i.B. Behling, N.B. Belin, s. Belous, K. Belov, i. Belyaev, i. Benane, G. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Andres, s. Bernet Bertolin, A. Betancourt, C. Betti, F. Bex, J. Bezshyiko, ia. Bhom, J. Bieker, M.s. Biesuz, N.V. Billoir, P. Biolchini, A. Birch, M. Bishop, F.C.R. Bitadze, A. Bizzeti, A. Blake, t. Blanc, F. Blank, J.E. Blusk, s. Bocharnikov, V. Boelhauve, J.A. Garcia, O. Boente Boettcher, t. Bohare, A. Boldyrev, A. Bolognani, C.s. Bolzonella, R. Bonacci, R.B. Bondar, N. Bordelius, A. Borgato, F. Borghi, s. Borsato, M. Borsuk, J.t. Bouchiba, s.A. Bovill, M. Bowcock, t.J.V. Boyer, A. Bozzi, C. Rodriguez, A. Brea Breer, N. Brodzicka, J. Gonzalo, A. Brossa Brown, J. Brundu, D. Buchanan, E. Buonaura, A. Buonincontri, L. Burke, A.t. Burr, C. Butter, J.s. Buytaert, J. Byczynski, W. Cadeddu, s. Cai, H. Caillet, A.C. Calabrese, R. Ramirez, s. Calderon Calefice, L. Cali, s. Calvi, M. Gomez, M. Calvo Magalhaes, P. Camargo Bouzas, J.i. Cambon Campana, P. Perez, D.H. Campora Quezada, A.F. Campoverde Capelli, s. Capriotti, L. School of Physics and Astronomy Monash University Melbourne Australia Rio de Janeiro Brazil Rio de Janeiro Brazil Department of Engineering Physics Tsinghua University Beijing China Beijing China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Chinese Academy of Sciences Beijing China Institute of Particle Physics Central China Normal University Hubei Wuhan China San Jose Costa Rica Université Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Université Clermont Auvergne CNRS IN2P3 LPC Clermont-Ferrand France Gif-sur-Yvette France Aix Marseille Univ CNRS IN2P3 CPPM Marseille France Université Paris-Saclay CNRS IN2P3 IJCLab Orsay France Laboratoire Leprince-Ringuet CNRS IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Universität Bonn - Helmholtz-Institut für Strahlen und Kernphysik Bonn Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physikalisches Institut Albert-Ludwigs-Universität Freiburg Freiburg Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano Milano Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Perugia Perugia Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma La Sapienza Roma Italy INFN Sezione di Roma Tor Vergata Roma Italy Nikhef National Institute for Subatom

the first evidence for the decay B− → D∗∗0τ−ντ is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1, at centre-of-mass energies of 7, 8 and 13 teV. Here, the D∗∗0 meson represents any of the three excited charm mesons D1(2420)0, D2∗(2460)0, and D1′ (2400)0. the B− → D∗∗0τ−ντ signal is measured with a significance of 3.5 σ, including systematic uncertainties. the combined branching fraction B (B− → D1∗∗20τ−ντ) × B(D1∗∗20 → D∗+π−), where D1∗∗20 denotes both D1(2420)0 and D2∗(2460)0 contributions, is measured to be (0.051 ± 0.013 (stat) ± 0.006 (syst) ± 0.009(ext))%, where the last uncertainty reflects that of the branching fraction of the normalisation channel B− → D1∗∗20Ds−(∗). the ratio between the tauonic and muonic semileptonic B decays, with the latter taken from world average values, is also determined and found to be R(D1∗∗20) = 0.13 ± 0.03 (stat) ± 0.01 (syst) ± 0.02 (ext). © 2025, CC BY.

关键词： Bosons

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Observation of a new charmed baryon decaying to Ξc+π−π+

arXiv

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arXiv 2025年

作者： Aaij, R. Abdelmotteleb, A.s.W. Beteta, C. Abellan Abudinén, F. Ackernley, t. Adefisoye, A.A. Adeva, B. Adinolfi, M. Adlarson, P. Agapopoulou, C. Aidala, C.A. Ajaltouni, Z. Akar, s. Akiba, K. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Aliouche, Z. Cartelle, P. Alvarez Amalric, R. Amato, s. Amey, J.L. Amhis, Y. An, L. Anderlini, L. Andersson, M. Andreianov, A. Andreola, P. Andreotti, M. Andreou, D. Anelli, A. Ao, D. Archilli, F. Argenton, M. Cuendis, s. Arguedas Artamonov, A. Artuso, M. Aslanides, E. Da silva, R. Ataíde Atzeni, M. Audurier, B. Bacher, D. Perea, i. Bachiller Bachmann, s. Bachmayer, M. Back, J.J. Rodriguez, P. Baladron Balagura, V. Balboni, A. Baldini, W. Balzani, L. Bao, H. de souza Leite, J. Baptista Pretel, C. Barbero Barbetti, M. Barbosa, i.R. Barlow, R.J. Barnyakov, M. Barsuk, s. Barter, W. Bartz, J. Basels, J.M. Bashir, s. Batsukh, B. Battista, P.B. Bay, A. Beck, A. Becker, M. Bedeschi, F. Bediaga, i.B. Behling, N.A. Belin, s. Belous, K. Belov, i. Belyaev, i. Benane, G. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Andres, s. Bernet Bertolin, A. Betancourt, C. Betti, F. Bex, J. Bezshyiko, ia. Bezshyyko, O. Bhom, J. Bieker, M.s. Biesuz, N.V. Billoir, P. Biolchini, A. Birch, M. Bishop, F.C.R. Bitadze, A. Bizzeti, A. Blake, t. Blanc, F. Blank, J.E. Blusk, s. Bocharnikov, V. Boelhauve, J.A. Garcia, O. Boente Boettcher, t. Bohare, A. Boldyrev, A. Bolognani, C.s. Bolzonella, R. Bonacci, R.B. Bondar, N. Bordelius, A. Borgato, F. Borghi, s. Borsato, M. Borsuk, J.t. Bottalico, E. Bouchiba, s.A. Bovill, M. Bowcock, t.J.V. Boyer, A. Bozzi, C. Brandenburg, J.D. Rodriguez, A. Brea Breer, N. Brodzicka, J. Gonzalo, A. Brossa Brown, J. Brundu, D. Buchanan, E. Buonincontri, L. Marcos, M. Burgos Burke, A.t. Burr, C. Butter, J.s. Buytaert, J. Byczynski, W. Cadeddu, s. Cai, H. Caillet, A. Calabrese, R. Ramirez, s. Calderon Calefice, L. Cali, s. Calvi, M. Gomez, M. Calvo Magalhaes, P. Camargo Bouzas, J.i. Cambon School of Physics and Astronomy Monash University Melbourne Australia Rio de Janeiro Brazil Rio de Janeiro Brazil Department of Engineering Physics Tsinghua University Beijing China Beijing China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Chinese Academy of Sciences Beijing China Institute of Particle Physics Central China Normal University Hubei Wuhan China San Jose Costa Rica Université Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Université Clermont Auvergne CNRS IN2P3 LPC Clermont-Ferrand France IRFU Saclay Gif-sur-Yvette France Aix Marseille Univ CNRS IN2P3 CPPM Marseille France Université Paris-Saclay CNRS IN2P3 IJCLab Orsay France Laboratoire Leprince-Ringuet CNRS IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Universität Bonn - Helmholtz-Institut für Strahlen und Kernphysik Bonn Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physikalisches Institut Albert-Ludwigs-Universität Freiburg Freiburg Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano Milano Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Perugia Perugia Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma La Sapienza Roma Italy INFN Sezione di Roma Tor Vergata Roma Italy Nikhef National Institu

the Ξc+π−π+ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 teV, corresponding to an integrated luminosity of 5.4 fb−1, collected by the LHCb experiment during 2016–2018. Four states are observed with high significance, and their masses and wi.t.s are measured to be m[Ξc(2815)+] = 2816.65 ± 0.03 ± 0.03 ± 0.23 MeV, Γ[Ξc(2815)+] = 2.07 ± 0.08 ± 0.12 MeV, m[Ξc(2923)+] = 2922.8 ± 0.3 ± 0.5 ± 0.2 MeV, Γ[Ξc(2923)+] = 5.3 ± 0.9 ± 1.4 MeV, m[Ξc(2970)+] = 2968.6 ± 0.5 ± 0.5 ± 0.2 MeV, Γ[Ξc(2970)+] = 31.7 ± 1.7 ± 1.9 MeV, m[Ξc(3080)+] = 3076.8 ± 0.7 ± 1.3 ± 0.2 MeV, Γ[Ξc(3080)+] = 6.8 ± 2.3 ± 0.9 MeV, where the uncertainties are statistical, systematic, and due to the limited precision on the Ξc+ mass, respectively. the Ξc(2923)+ baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed Ξc(2923)0 state. Most of the measured parameters are more precise than existing world averages. © 2025, CC BY.

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study of the Bose-Einstein correlations of same-sign pions in proton-lead collisions

arXiv

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arXiv 2023年

作者： Aaij, R. Abellán Beteta, C. Ackernley, t. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C.A. Aiola, s. Ajaltouni, Z. Akar, s. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Aliouche, Z. Alkhazov, G. Alvarez Cartelle, P. Amato, s. Amhis, Y. An, L. Anderlini, L. Andreianov, A. Andreotti, M. Archilli, F. Artamonov, A. Artuso, M. Arzymatov, K. Aslanides, E. Atzeni, M. Audurier, B. Bachmann, s. Bachmayer, M. Back, J.J. Baker, s. Baladron Rodriguez, P. Balagura, V. Baldini, W. Baptista Leite, J. Barlow, R.J. Barsuk, s. Barter, W. Bartolini, M. Baryshnikov, F. Basels, J.M. Bassi, G. Batsukh, B. Battig, A. Bay, A. Becker, M. Bedeschi, F. Bediaga, i. Beiter, A. Belavin, V. Belin, s. Bellee, V. Belous, K. Belov, i. Belyaev, i. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Berninghoff, D. Bernstein, H.C. Bertella, C. Bertolin, A. Betancourt, C. Betti, F. Bezshyiko, ia. Bhasin, s. Bhom, J. Bian, L. Bieker, M.s. Bifani, s. Billoir, P. Birch, M. Bishop, F.C.R. Bitadze, A. Bizzeti, A. Bjørn, M. Blago, M.P. Blake, t. Blanc, F. Blusk, s. Bobulska, D. Boelhauve, J.A. Boente Garcia, O. Boettcher, t. Boldyrev, A. Bondar, A. Bondar, N. Borghi, s. Borisyak, M. Borsato, M. Borsuk, J.t. Bouchiba, s.A. Bowcock, t.J.V. Boyer, A. Bozzi, C. Bradley, M.J. Braun, s. Brea Rodriguez, A. Brodski, M. Brodzicka, J. Brossa Gonzalo, A. Brundu, D. Buonaura, A. Burr, C. Bursche, A. Butkevich, A. Butter, J.s. Buytaert, J. Byczynski, W. Cadeddu, s. Cai, H. Calabrese, R. Calefice, L. Calero Diaz, L. Cali, s. Calladine, R. Calvi, M. Calvo Gomez, M. Camargo Magalhaes, P. Camboni, A. Campana, P. Campoverde Quezada, A.F. Capelli, s. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carli, i. Carniti, P. Carus, L. Carvalho Akiba, K. Casais Vidal, A. Casse, G. Cattaneo, M. Cavallero, G. Celani, s. Cerasoli, J. Chadwick, A.J. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chavez Barajas, C.A. Chefdeville, M. Chen, C. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China Beijing China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Chinese Academy of Sciences Beijing China Institute of Particle Physics Central China Normal University Hubei Wuhan China Univ. Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Université Paris-Saclay CNRS/IN2P3 IJCLab Orsay France Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano Milano Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Cagliari Monserrato Italy Universita degli Studi di Padova Universita e INFN Padova Padova Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma La Sapienza Roma Italy INFN Sezione di Roma Tor Vergata Roma Italy Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Subatomic Physics VU University Amsterdam Amsterdam Netherlands AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Henryk Niewodniczanski Institute of Nuclear Physics Polish

Correlations of same-sign charged pions are analysed using proton-lead collision data collected by the LHCb experiment at a nucleon-nucleon centre-of-mass energy of 5.02 teV, corresponding to an integrated luminosity of 1.06 nb-1. Bose-Einstein correlations are observed in the form of an enhancement of pair production for same-sign charged pions with a small four-momentum difference. the dependence of the correlation radius and the intercept parameter on the reconstructed charged-particle multiplicity is investigated. the measured correlation radii scale linearly with the cube root of the reconstructed charged-particle multiplicity, being compatible with predictions of hydrodynamic models on the collision system evolution. © 2023, CC BY.

关键词： Charged particles

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search for resonance-enhanced CP and angular asymmetries in the Λ+c → pµ+µ− decay at LHCb

arXiv

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arXiv 2025年

作者： Aaij, R. Abdelmotteleb, A.s.W. Beteta, C. Abellan Abudinén, F. Ackernley, t. Adefisoye, A.A. Adeva, B. Adinolfi, M. Adlarson, P. Agapopoulou, C. Aidala, C.A. Ajaltouni, Z. Akar, s. Akiba, K. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Aliouche, Z. Cartelle, P. Alvarez Amalric, R. Amato, s. Amey, J.L. Amhis, Y. An, L. Anderlini, L. Andersson, M. Andreianov, A. Andreola, P. Andreotti, M. Andreou, D. Anelli, A. Ao, D. Archilli, F. Argenton, M. Cuendis, s. Arguedas Artamonov, A. Artuso, M. Aslanides, E. Da silva, R. Ataíde Atzeni, M. Audurier, B. Bacher, D. Perea, i. Bachiller Bachmann, s. Bachmayer, M. Back, J.J. Rodriguez, P. Baladron Balagura, V. Balboni, A. Baldini, W. Balzani, L. Bao, H. de souza Leite, J. Baptista Pretel, C. Barbero Barbetti, M. Barbosa, i.R. Barlow, R.J. Barnyakov, M. Barsuk, s. Barter, W. Bartz, J. Basels, J.M. Bashir, s. Bassi, G. Batsukh, B. Battista, P.B. Bay, A. Beck, A. Becker, M. Bedeschi, F. Bediaga, i.B. Behling, N.A. Belin, s. Belous, K. Belov, i. Belyaev, i. Benane, G. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Andres, s. Bernet Bertolin, A. Betancourt, C. Betti, F. Bex, J. Bezshyiko, ia. Bhom, J. Bieker, M.s. Biesuz, N.V. Billoir, P. Biolchini, A. Birch, M. Bishop, F.C.R. Bitadze, A. Bizzeti, A. Blake, t. Blanc, F. Blank, J.E. Blusk, s. Bocharnikov, V. Boelhauve, J.A. Garcia, O. Boente Boettcher, t. Bohare, A. Boldyrev, A. Bolognani, C.s. Bolzonella, R. Bonacci, R.B. Bondar, N. Bordelius, A. Borgato, F. Borghi, s. Borsato, M. Borsuk, J.t. Bottalico, E. Bouchiba, s.A. Bovill, M. Bowcock, t.J.V. Boyer, A. Bozzi, C. Brandenburg, J.D. Rodriguez, A. Brea Breer, N. Brodzicka, J. Gonzalo, A. Brossa Brown, J. Brundu, D. Buchanan, E. Buonincontri, L. Marcos, M. Burgos Burke, A.t. Burr, C. Butter, J.s. Buytaert, J. Byczynski, W. Cadeddu, s. Cai, H. Caillet, A. Calabrese, R. Ramirez, s. Calderon Calefice, L. Cali, s. Calvi, M. Gomez, M. Calvo Magalhaes, P. Camargo Bouzas, J.i. Cambon Campana, P. School of Physics and Astronomy Monash University Melbourne Australia Rio de Janeiro Brazil Rio de Janeiro Brazil Department of Engineering Physics Tsinghua University Beijing China Beijing China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Chinese Academy of Sciences Beijing China Institute of Particle Physics Central China Normal University Hubei Wuhan China San Jose Costa Rica Université Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Université Clermont Auvergne CNRS IN2P3 LPC Clermont-Ferrand France IRFU Saclay France IRFU Gif-sur-Yvette France Aix Marseille Univ CNRS IN2P3 CPPM Marseille France Université Paris-Saclay CNRS IN2P3 IJCLab Orsay France Laboratoire Leprince-Ringuet CNRS IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Universität Bonn - Helmholtz-Institut für Strahlen und Kernphysik Bonn Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physikalisches Institut Albert-Ludwigs-Universität Freiburg Freiburg Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano Milano Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Perugia Perugia Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma La Sapienza Roma Italy INFN Sezione di Roma Tor Vergata Roma Italy Nikhef N

the first measurement of the CP asymmetry of the decay rate (ACP) and the CP average (ΣAFB) and CP asymmetry (∆AFB) of the forward-backward asymmetry in the muon system of Λ+c → pµ+µ− decays is reported. the measurement is performed using a data sample of proton-proton collisions, recorded by the LHCb experiment from 2016 to 2018 at a center-of-mass energy of 13 teV, which corresponds to an integrated luminosity of 5.4 fb−1. the asymmetries are measured in two regions of dimuon mass near the -meson mass peak. the dimuon-mass integrated results are ACP = (−1.1 ± 4.0 ± 0.5)%, ΣAFB = (3.9 ± 4.0 ± 0.6)%, ∆AFB = (3.1 ± 4.0 ± 0.4)%, where the first uncertainty is statistical and the second systematic. the results are consistent with the conservation of CP symmetry and the standard Model expectations. © 2025, CC BY.

关键词： Colliding beam accelerators

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Measurement of the multiplicity dependence of Υ production ratios in pp collisions at √s = 13 teV

arXiv

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arXiv 2025年

作者： Aaij, R. Abdelmotteleb, A.s.W. Beteta, C. Abellan Abudinén, F. Ackernley, t. Adefisoye, A.A. Adeva, B. Adinolfi, M. Adlarson, P. Agapopoulou, C. Aidala, C.A. Ajaltouni, Z. Akar, s. Akiba, K. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Aliouche, Z. Cartelle, P. Alvarez Amalric, R. Amato, s. Amey, J.L. Amhis, Y. An, L. Anderlini, L. Andersson, M. Andreianov, A. Andreola, P. Andreotti, M. Andreou, D. Anelli, A. Ao, D. Archilli, F. Argenton, M. Cuendis, s. Arguedas Artamonov, A. Artuso, M. Aslanides, E. Da silva, R. Ataíde Atzeni, M. Audurier, B. Bacher, D. Perea, i. Bachiller Bachmann, s. Bachmayer, M. Back, J.J. Rodriguez, P. Baladron Balagura, V. Balboni, A. Baldini, W. Balzani, L. Bao, H. de souza Leite, J. Baptista Pretel, C. Barbero Barbetti, M. Barbosa, i.R. Barlow, R.J. Barnyakov, M. Barsuk, s. Barter, W. Bartolini, M. Bartz, J. Basels, J.M. Bashir, s. Bassi, G. Batsukh, B. Battista, P.B. Bay, A. Beck, A. Becker, M. Bedeschi, F. Bediaga, i.B. Behling, N.A. Belin, s. Belous, K. Belov, i. Belyaev, i. Benane, G. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Andres, s. Bernet Bertolin, A. Betancourt, C. Betti, F. Bex, J. Bezshyiko, ia. Bhom, J. Bieker, M.s. Biesuz, N.V. Billoir, P. Biolchini, A. Birch, M. Bishop, F.C.R. Bitadze, A. Bizzeti, A. Blake, t. Blanc, F. Blank, J.E. Blusk, s. Bocharnikov, V. Boelhauve, J.A. Garcia, O. Boente Boettcher, t. Bohare, A. Boldyrev, A. Bolognani, C.s. Bolzonella, R. Bonacci, R.B. Bondar, N. Bordelius, A. Borgato, F. Borghi, s. Borsato, M. Borsuk, J.t. Bouchiba, s.A. Bovill, M. Bowcock, t.J.V. Boyer, A. Bozzi, C. Rodriguez, A. Brea Breer, N. Brodzicka, J. Gonzalo, A. Brossa Brown, J. Brundu, D. Buchanan, E. Buonaura, A. Buonincontri, L. Burke, A.t. Burr, C. Butter, J.s. Buytaert, J. Byczynski, W. Cadeddu, s. Cai, H. Caillet, A.C. Calabrese, R. Ramirez, s. Calderon Calefice, L. Cali, s. Calvi, M. Gomez, M. Calvo Magalhaes, P. Camargo Bouzas, J.i. Cambon Campana, P. Perez, D.H. Campora School of Physics and Astronomy Monash University Melbourne Australia Rio de Janeiro Brazil Rio de Janeiro Brazil Department of Engineering Physics Tsinghua University Beijing China Beijing China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Chinese Academy of Sciences Beijing China Institute of Particle Physics Central China Normal University Hubei Wuhan China San Jose Costa Rica Université Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Université Clermont Auvergne CNRS IN2P3 LPC Clermont-Ferrand France IRFU Gif-Sur-Yvette Saclay France Aix Marseille Univ CNRS IN2P3 CPPM Marseille France Université Paris-Saclay CNRS IN2P3 IJCLab Orsay France Laboratoire Leprince-Ringuet CNRS IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France LPNHE Sorbonne Université Paris Diderot CNRS IN2P3 Sorbonne Paris Cité Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Universität Bonn Helmholtz-Institut für Strahlen und Kernphysik Bonn Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physikalisches Institut Albert-Ludwigs-Universität Freiburg Freiburg Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano Milano Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Perugia Perugia Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma La Sapienza Roma Italy INFN Sezione di Roma Tor Vergata Roma Italy Nikhef National Instit

the Υ(2s) and Υ(3s) production cross-sections are measured relative to that of the Υ(1s) meson, as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy of 13 teV. the measurement uses data collected by the LHCb experiment in 2018 corresponding to an integrated luminosity of 2 fb−1. Both the Υ(2s)-to-Υ(1s) and Υ(3s)-to-Υ(1s) cross-section ratios are found to decrease significantly as a function of event multiplicity, with the Υ(3s)-to-Υ(1s) ratio showing a steeper decline towards high multiplicity. this hierarchy is qualitatively consistent with the comover model predictions, indicating that final-state interactions play an important role in bottomonia production in high-multiplicity events. © 2025, CC BY.

关键词： Charged particles

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study of light-meson resonances decaying to Ks0Kπ in the B → (Ks0Kπ)K channels

arXiv

引用

arXiv 2025年

作者： Aaij, R. Abdelmotteleb, A.s.W. Beteta, C. Abellan Abudinén, F. Ackernley, t. Adefisoye, A.A. Adeva, B. Adinolfi, M. Adlarson, P. Agapopoulou, C. Aidala, C.A. Ajaltouni, Z. Akar, s. Akiba, K. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Aliouche, Z. Cartelle, P. Alvarez Amalric, R. Amato, s. Amey, J.L. Amhis, Y. An, L. Anderlini, L. Andersson, M. Andreianov, A. Andreola, P. Andreotti, M. Andreou, D. Anelli, A. Ao, D. Archilli, F. Argenton, M. Cuendis, s. Arguedas Artamonov, A. Artuso, M. Aslanides, E. Da silva, R. Ataíde Atzeni, M. Audurier, B. Bacher, D. Perea, i. Bachiller Bachmann, s. Bachmayer, M. Back, J.J. Rodriguez, P. Baladron Balagura, V. Balboni, A. Baldini, W. Balzani, L. Bao, H. de souza Leite, J. Baptista Pretel, C. Barbero Barbetti, M. Barbosa, i.R. Barlow, R.J. Barnyakov, M. Barsuk, s. Barter, W. Bartz, J. Basels, J.M. Bashir, s. Bassi, G. Batsukh, B. Battista, P.B. Bay, A. Beck, A. Becker, M. Bedeschi, F. Bediaga, i.B. Behling, N.A. Belin, s. Belous, K. Belov, i. Belyaev, i. Benane, G. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Andres, s. Bernet Bertolin, A. Betancourt, C. Betti, F. Bex, J. Bezshyiko, ia. Bhom, J. Bieker, M.s. Biesuz, N.V. Billoir, P. Biolchini, A. Birch, M. Bishop, F.C.R. Bitadze, A. Blake, t. Blanc, F. Blank, J.E. Blusk, s. Bocharnikov, V. Boelhauve, J.A. Garcia, O. Boente Boettcher, t. Bohare, A. Boldyrev, A. Bolognani, C.s. Bolzonella, R. Bonacci, R.B. Bondar, N. Bordelius, A. Borgato, F. Borghi, s. Borsato, M. Borsuk, J.t. Bottalico, E. Bouchiba, s.A. Bovill, M. Bowcock, t.J.V. Boyer, A. Bozzi, C. Brandenburg, J.D. Rodriguez, A. Brea Breer, N. Brodzicka, J. Gonzalo, A. Brossa Brown, J. Brundu, D. Buchanan, E. Buonincontri, L. Marcos, M. Burgos Burke, A.t. Burr, C. Butter, J.s. Buytaert, J. Byczynski, W. Cadeddu, s. Cai, H. Caillet, A.C. Calabrese, R. Ramirez, s. Calderon Calefice, L. Cali, s. Calvi, M. Gomez, M. Calvo Magalhaes, P. Camargo Bouzas, J.i. Cambon Campana, P. Perez, D.H. Campora Quezada, A.F. Campoverde Capelli, s. School of Physics and Astronomy Monash University Melbourne Australia Rio de Janeiro Brazil Rio de Janeiro Brazil Department of Engineering Physics Tsinghua University Beijing China Beijing China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Chinese Academy of Sciences Beijing China Institute of Particle Physics Central China Normal University Hubei Wuhan China San Jose Costa Rica Université Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France IRFU Gif-Sur-Yvette Saclay France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Université Paris-Saclay CNRS/IN2P3 IJCLab Orsay France Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Universität Bonn - Helmholtz-Institut für Strahlen und Kernphysik Bonn Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physikalisches Institut Albert-Ludwigs-Universität Freiburg Freiburg Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano Milano Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Perugia Perugia Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma La Sapienza Roma Italy INFN Sezione di Roma Tor Vergata Roma Italy Nikhef National Institute f

A study is presented of B+ → Ks0K−π+K+ and B+ → Ks0K+π−K+ decays based on the analysis of proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 teV, corresponding to an integrated luminosity of 9 fb−1. the Ks0Kπ invariant-mass distributions of both B+ decay modes show, in the m(Ks0Kπ) PC = 0−+, 1++ and 1+− resonances is observed, dominated by η(1405), η(1470), η(1760), f1(1285), f1(1420) and h1(1405) resonances. the Ks0Kπ Dalitz plots are dominated by asymmetric crossing K∗K bands which are different for the two B+ decay modes. this is due to a different interference pattern between the 1++ and 1+− amplitudes in the two channels. Branching fractions are measured for each resonant contribution. © 2025, CC BY.

关键词： Bosons

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Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star tOi-815*

arXiv

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arXiv 2024年

作者： Psaridi, Angelica Osborn, Hugh Bouchy, François Lendl, Monika Parc, Léna Billot, Nicolas Broeg, Christopher sousa, sérgio G. Adibekyan, Vardan Attia, Omar Bonfanti, Andrea Chakraborty, Hritam Collins, Karen A. Davoult, Jeanne Delgado-Mena, Elisa Grieves, Nolan Guillot, tristan Heitzmann, Alexis Helled, Ravit Hellier, Coel Jenkins, Jon M. Knierim, Henrik Krenn, Andreas Lissauer, Jack J. Luque, Rafael Rapetti, David santos, Nuno C. suárez, Olga Venturini, Julia Wilkin, Francis P. Wilson, thomas G. Winn, Joshua N. Ziegler, Carl Zingales, tiziano Alibert, Yann Brandeker, Alexis Egger, Jo Ann Gandolfi, Davide Hooton, Matthew J. tuson, Amy Ulmer-Moll, solène Abe, Lyu Allart, Romain Alonso, Roi Anderson, David R. Anglada, Guillem Bárczy, tamas Barrado, David Barros, susana C.C. Baumjohann, Wolfgang Beck, Mathias Beck, thomas Benz, Willy Bonfils, Xavier Borsato, Luca Bourrier, Vincent Ciardi, David R. Cameron, Andrew Collier Charnoz, sébastien Cointepas, Marion Csizmadia, szilárd Cubillos, Patricio Curto, Gaspare Lo Davies, Melvyn B. Daylan, tansu Deleuil, Magali Deline, Adrien Delrez, Laetitia Demangeon, Olivier D.s. Demory, Brice-Olivier Dorn, Caroline Dumusque, Xavier Ehrenreich, David Erikson, Anders des Etangs, Alain Lecavelier de Miguel Ferreras, Elena Diana Fortier, Andrea Fossati, Luca Frensch, Yolanda G.C. Fridlund, Malcolm Gillon, Michaël Güdel, Manuel Günther, Maximilian N. Hagelberg, Janis Helling, Christiane Hoyer, sergio isaak, Kate G. Kiss, Laszlo L. Lam, Kristine Laskar, Jacques Lavie, Baptiste Lovis, Christophe Magrin, Demetrio Marafatto, Luca Maxted, Pierre McDermott, scott Mékarnia, Djamel Mordasini, Christoph Murgas, Felipe Nascimbeni, Valerio Nielsen, Louise D. Olofsson, Göran Ottensamer, Roland Pagano, isabella Pallé, Enric Peter, Gisbert Piotto, Giampaolo Pollacco, Don Queloz, Didier Ragazzoni, Roberto Ramos, Devin Rando, Nicola Rauer, Heike Reimers, Christian Ribas, ignasi seager, sara ségransan, Damien scandariato, Gaetano simon, Attila smith, Alexis M.s. stalport, Manu steller, Manfred szabó, Gy Observatoire de Genève Université de Genève Chemin Pegasi 51 Versoix1290 Switzerland Center for Space and Habitability University of Bern Gesellschaftsstrasse 6 Bern3012 Switzerland Department of Physics Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology CambridgeMA02139 United States Weltraumforschung und Planetologie Physikalisches Institut University of Bern Gesellschaftsstrasse 6 Bern3012 Switzerland Instituto de Astrofísica e Ciências do Espaço Universidade do Porto CAUP Rua das Estrelas Porto4150-762 Portugal Departamento de Física e Astronomia Faculdade de Ciências Universidade do Porto Rua do Campo Alegre Porto4169-007 Portugal Space Research Institute Austrian Academy of Sciences Schmiedlstraße 6 Graz8042 Austria Center for Astrophysics Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States Université Côte d’Azur Observatoire de la Côte d’Azur CNRS Laboratoire Lagrange Bd de l’Observatoire CS 34229 Nice06304 Cedex 4 France Institute for Computational Science University of Zurich Winterthurerstr. 90 Zurich8057 Switzerland Astrophysics Group Keele University StaffordshireST5 5BG United Kingdom Department of Astronomy & Astrophysics University of Chicago ChicagoIL60637 United States NASA Ames Research Center Moffett FieldCA94035 United States Research Institute for Advanced Computer Science Universities Space Research Association WashingtonDC20024 United States Department of Physics and Astronomy Union College 807 Union St. SchenectadyNY12308 United States Department of Physics University of Warwick Gibbet Hill Road CoventryCV4 7AL United Kingdom Department of Astrophysical Sciences Princeton University PrincetonNJ08544 United States Department of Physics Engineering and Astronomy Stephen F. Austin State University 1936 North St NacogdochesTX75962 United States Dipartimento di Fisica e Astronomia ""Galileo Galilei"" Università degli Studi di Padova Vicol

We present the discovery and characterization of two warm mini-Neptunes transiting the K3V star tOi-815 in a K-M binary system. Analysis of its spectra and rotation period reveal the star to be young, with an age of 200+400−200 Myr. tOi-815b has a 11.2-day period and a radius of 2.94 ± 0.05 R with transits observed by tEss, CHEOPs, AstEP, and LCOGt. the outer planet, tOi-815c, has a radius of 2.62 ± 0.10 R, based on observations of three nonconsecutive transits with tEss;targeted CHEOPs photometry and radial velocity follow-up with EsPREssO were required to confirm the 35-day period. EsPREssO confirmed the planetary nature of both planets and measured masses of 7.6 ± 1.5 M (ρP = 1.64+0.33−0.31 g cm−3) and 23.5 ± 2.4 M (ρP = 7.2+1.1−1.0 g cm−3), respectively. thus, the planets have very different masses, which is unusual for compact multi-planet systems. Moreover, our statistical analysis of mini-Neptunes orbiting FGK stars suggests that weakly irradiated planets tend to have higher bulk densities compared to those undergoing strong irradiation. this could be ascribed to their cooler atmospheres, which are more compressed and denser. internal structure modeling of tOi-815b suggests it likely has a H-He atmosphere that constitutes a few percent of the total planet mass, or higher if the planet is assumed to have no water. in contrast, the measured mass and radius of tOi-815c can be explained without invoking any atmosphere, challenging planetary formation theories. Finally, we infer from our measurements that the star is viewed close to pole-on, which implies a spin-orbit misalignment at the 3σ level. this emphasizes the peculiarity of the system’s orbital architecture, and probably hints at an eventful dynamical history. © 2024, CC BY.

关键词： Photometry

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search for a vector-like quark t′ → tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at √s = 13 teV

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Journal of High Energy Physics 2023年第9期2023卷 1-40页

作者： tumasyan, A. Adam, W. Andrejkovic, J.W. Bergauer, t. Chatterjee, s. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P.s. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Mikulec, i. Paulitsch, P. Pitters, F.M. schieck, J. schöfbeck, R. schwarz, D. sonawane, M. templ, s. Waltenberger, W. Wulz, C.-E. Darwish, M.R. Janssen, t. Kello, t. Rejeb sfar, H. Van Mechelen, P. Bols, E.s. D’Hondt, J. De Moor, A. Delcourt, M. El Faham, H. Lowette, s. Moortgat, s. Morton, A. Müller, D. sahasransu, A.R. tavernier, s. Van Doninck, W. Vannerom, D. Clerbaux, B. De Lentdecker, G. Favart, L. Hohov, D. Jaramillo, J. Lee, K. Mahdavikhorrami, M. Makarenko, i. Malara, A. Paredes, s. Pétré, L. Postiau, N. thomas, L. Vanden Bemden, M. Vander Velde, C. Vanlaer, P. Dobur, D. Knolle, J. Lambrecht, L. Mestdach, G. Rendón, C. samalan, A. skovpen, K. tytgat, M. Van Den Bossche, N. Vermassen, B. Wezenbeek, L. Benecke, A. Bruno, G. Bury, F. Caputo, C. David, P. Delaere, C. Donertas, i.s. Giammanco, A. Jaffel, K. Jain, sa. Lemaitre, V. Mondal, K. taliercio, A. tran, t.t. Vischia, P. Wertz, s. Alves, G.A. Coelho, E. Hensel, C. Moraes, A. Rebello teles, P. Aldá Júnior, W.L. Alves Gallo Pereira, M. Barroso Ferreira Filho, M. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Da Costa, E.M. Da silveira, G.G. De Jesus Damiao, D. Dos santos sousa, V. Fonseca De souza, s. Martins, J. Mora Herrera, C. Mota Amarilo, K. Mundim, L. Nogima, H. santoro, A. silva Do Amaral, s.M. sznajder, A. thiel, M. Vilela Pereira, A. Bernardes, C.A. Calligaris, L. Fernandez Perez tomei, t.R. Gregores, E.M. Mercadante, P.G. Novaes, s.F. Padula, sandra s. Aleksandrov, A. Antchev, G. Hadjiiska, R. iaydjiev, P. Misheva, M. Rodozov, M. shopova, M. sultanov, G. Dimitrov, A. ivanov, t. Litov, L. Pavlov, B. Petkov, P. Petrov, A. shumka, E. thakur, s. Cheng, t. Javaid, t. Mittal, M. Yuan, L. Ahmad, M. Bauer, G. Hu, Z. Lezki, s. Yi, K. Chen, G.M. Chen, H.s. Chen, M. iemmi, F. Jiang, C.H. Kapoor, A. Liao, H. Liu, Z.-A. Milosevic, V. Monti, F. sharma, R. tao, J. thomas-Wilsker Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) — Fudan University Shanghai China Zhejiang University Zhejiang Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics

A search for the electroweak production of a vector-like quark t′, decaying to a top quark and a Higgs boson is presented. the search is based on a sample of proton-proton collision events recorded at the LHC at s = 13 teV, corresponding to an integrated luminosity of 138 fb1sup>. this is the first t′ search that exploits the Higgs boson decay to a pair of photons. For narrow isospin singlet t′ states with masses up to 1.1 teV, the excellent diphoton invariant mass resolution of 1–2% results in an increased sensitivity compared to previous searches based on the same production mechanism. the electroweak production of a t′ quark with mass up to 960 GeV is excluded at 95% confidence level, assuming a coupling strength κtsub> = 0.25 and a relative decay width Γ/Mt′sub> < 5%. [Figure not available: see fulltext.]. © 2023, the Author(s).

关键词： Beyond standard Model Hadron-Hadron scattering top Physics

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Bottom quark energy loss and hadronization with B+ and nuclear modification factors using pp and PbPb collisions at = 5.02 teV

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Journal of High Energy Physics 2025年第2期2025卷 1-40页

作者： Hayrapetyan, A. tumasyan, A. Adam, W. Andrejkovic, J. W. Bergauer, t. Chatterjee, s. Damanakis, K. Dragicevic, M. Hussain, P. s. Jeitler, M. Krammer, N. Li, A. Liko, D. Mikulec, i. schieck, J. schöfbeck, R. schwarz, D. sonawane, M. templ, s. Waltenberger, W. Wulz, C.-E. Darwish, M. R. Janssen, t. Van Mechelen, P. Breugelmans, N. D’Hondt, J. Dansana, s. De Moor, A. Delcourt, M. Heyen, F. Lowette, s. Makarenko, i. Müller, D. tavernier, s. tytgat, M. Van Onsem, G. P. Van Putte, s. Vannerom, D. Bilin, B. Clerbaux, B. Das, A. K. De Lentdecker, G. Evard, H. Favart, L. Gianneios, P. Jaramillo, J. Khalilzadeh, A. Khan, F. A. Lee, K. Mahdavikhorrami, M. Malara, A. Paredes, s. shahzad, M. A. thomas, L. Vanden Bemden, M. Vander Velde, C. Vanlaer, P. De Coen, M. Dobur, D. Gokbulut, G. Hong, Y. Knolle, J. Lambrecht, L. Marckx, D. Mota Amarilo, K. samalan, A. skovpen, K. Van Den Bossche, N. van der Linden, J. Wezenbeek, L. Benecke, A. Bethani, A. Bruno, G. Caputo, C. De Favereau De Jeneret, J. Delaere, C. Donertas, i. s. Giammanco, A. Guzel, A. O. Jain, sa. Lemaitre, V. Lidrych, J. Mastrapasqua, P. tran, t. t. Wertz, s. Alves, G. A. Alves Gallo Pereira, M. Coelho, E. Correia silva, G. Hensel, C. Menezes De Oliveira, t. Moraes, A. Rebello teles, P. soeiro, M. Vilela Pereira, A. Aldá Júnior, W. L. Barroso Ferreira Filho, M. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Da Costa, E. M. Da silveira, G. G. De Jesus Damiao, D. Fonseca De souza, s. Gomes De souza, R. Macedo, M. Martins, J. Mora Herrera, C. Mundim, L. Nogima, H. Pinheiro, J. P. santoro, A. sznajder, A. thiel, M. Bernardes, C. A. Calligaris, L. Fernandez Perez tomei, t. R. Gregores, E. M. Maietto silverio, i. Mercadante, P. G. Novaes, s. F. Orzari, B. Padula, sandra s. Aleksandrov, A. Antchev, G. Hadjiiska, R. iaydjiev, P. Misheva, M. shopova, M. sultanov, G. Dimitrov, A. Litov, L. Pavlov, B. Petkov, P. Petrov, A. shumka, E. Keshri, s. thakur, s. Cheng, t. Javaid, t. Yuan, L. Hu, Z. Liang, Z. Liu, J. Yi, K. Chen, G. M. Chen, H. s. Chen, M. iemmi, F. Jiang, C. H. Yerevan Physics Institute Yerevan Armenia Yerevan State University Yerevan Armenia Institut für Hochenergiephysik Vienna Austria TU Wien Vienna Austria Universiteit Antwerpen Antwerpen Belgium Institute of Basic and Applied Sciences Faculty of Engineering Arab Academy for Science Technology and Maritime Transport Alexandria Egypt Vrije Universiteit Brussel Brussel Belgium Ghent University Ghent Belgium Université Libre de Bruxelles Bruxelles Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual de Campinas Campinas Brazil Federal University of Rio Grande do Sul Porto Alegre Brazil UFMS Nova Andradina Brazil Universidade Estadual Paulista Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Instituto De Alta Investigación Universidad de Tarapacá Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Nanjing Normal University Nanjing China The University of Iowa Iowa City USA Institute of High Energy Physics Beijing China University of Chinese Academy of Sciences Beijing China China Center of Advanced Science and Technology Beijing China China Spallation Neutron Source Guangdong China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Guangdong Provincial Key Laboratory of Nuclear Science and Guangdong-Hong Kong Joint Laboratory of Quantum Matter South China Normal University Guangzhou China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Henan Normal University Xinxiang China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) - Fudan University Shanghai China Zhejiang University Hangzhou Ch

the production cross sections of $$ {\textrm{B}}_{\textrm{s}}^0 $$ and B+ mesons are reported in proton-proton (pp) collisions recorded by the CMS experiment at the CERN LHC with a center-of-mass energy of 5.02 teV. the data sample corresponds to an integrated luminosity of 302 pb−1. the cross sections are based on measurements of the $$ {\textrm{B}}_{\textrm{s}}^0 $$ → J/ψ(μ+μ−)ϕ(1020)(K+K−) and B+ → J/ψ(μ+μ−)K+ decay channels. Results are presented in the transverse momentum (pt) range 7–50 GeV/c and the rapidity interval |y| < 2.4 for the B mesons. the measured pt-differential cross sections of B+ and $$ {\textrm{B}}_{\textrm{s}}^0 $$ in pp collisions are well described by fixed-order plus next-to-leading logarithm perturbative quantum chromodynamics calculations. Using previous PbPb collision measurements at the same nucleon-nucleon center-of-mass energy, the nuclear modification factors, RAA, of the B mesons are determined. For pt > 10 GeV/c, both mesons are found to be suppressed in PbPb collisions (with RAA values significantly below unity), with less suppression observed for the $$ {\textrm{B}}_{\textrm{s}}^0 $$ mesons. in this pt range, the RAA values for the B+ mesons are consistent with those for inclusive charged hadrons and D0 mesons. Below 10 GeV/c, both B+ and $$ {\textrm{B}}_{\textrm{s}}^0 $$ are found to be less suppressed than either inclusive charged hadrons or D0 mesons, with the $$ {\textrm{B}}_{\textrm{s}}^0 $$ RAA value consistent with unity. the RAA values found for the B+ and $$ {\textrm{B}}_{\textrm{s}}^0 $$ are compared to theoretical calculations, providing constraints on the mechanism of bottom quark energy loss and hadronization in the quark-gluon plasma, the hot and dense matter created in ultrarelativistic heavy ion collisions.

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First measurement of the top quark pair production cross section in proton-proton collisions at s = 13.6 teV

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Journal of High Energy Physics 2023年第8期2023卷 204页

作者： tumasyan, A. Adam, W. Andrejkovic, J.W. Bergauer, t. Chatterjee, s. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P.s. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Mikulec, i. schieck, J. schöfbeck, R. schwarz, D. sonawane, M. templ, s. Waltenberger, W. Wulz, C.-E. Darwish, M.R. Janssen, t. Kello, t. Van Mechelen, P. Bols, E.s. D’Hondt, J. De Moor, A. Delcourt, M. El Faham, H. Lowette, s. Morton, A. Müller, D. sahasransu, A.R. tavernier, s. Van Doninck, W. Van Putte, s. Vannerom, D. Clerbaux, B. Dansana, s. De Lentdecker, G. Favart, L. Hohov, D. Jaramillo, J. Lee, K. Mahdavikhorrami, M. Makarenko, i. Malara, A. Paredes, s. Pétré, L. Postiau, N. thomas, L. Vanden Bemden, M. Vander Velde, C. Vanlaer, P. Dobur, D. Knolle, J. Lambrecht, L. Mestdach, G. Rendón, C. samalan, A. skovpen, K. tytgat, M. Van Den Bossche, N. Vermassen, B. Wezenbeek, L. Benecke, A. Bruno, G. Bury, F. Caputo, C. David, P. Delaere, C. Donertas, i.s. Giammanco, A. Jaffel, K. Jain, sa. Lemaitre, V. Lidrych, J. Mondal, K. tran, t.t. Vischia, P. Wertz, s. Alves, G.A. Coelho, E. Hensel, C. Moraes, A. Rebello teles, P. Aldá Júnior, W.L. Alves Gallo Pereira, M. Barroso Ferreira Filho, M. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Da Costa, E.M. Da silveira, G.G. De Jesus Damiao, D. Dos santos sousa, V. Fonseca De souza, s. Martins, J. Mora Herrera, C. Mota Amarilo, K. Mundim, L. Nogima, H. santoro, A. silva Do Amaral, s.M. sznajder, A. thiel, M. Vilela Pereira, A. Bernardes, C.A. Calligaris, L. Fernandez Perez tomei, t.R. Gregores, E.M. Mercadante, P.G. Novaes, s.F. Orzari, B. Padula, sandra s. Aleksandrov, A. Antchev, G. Hadjiiska, R. iaydjiev, P. Misheva, M. Rodozov, M. shopova, M. sultanov, G. Dimitrov, A. ivanov, t. Litov, L. Pavlov, B. Petkov, P. Petrov, A. shumka, E. Keshri, s. thakur, s. Cheng, t. Guo, Q. Javaid, t. Mittal, M. Yuan, L. Bauer, G. Hu, Z. Lezki, s. Yi, K. Chen, G.M. Chen, H.s. Chen, M. iemmi, F. Jiang, C.H. Kapoor, A. Liao, H. Liu, Z.-A. Milosevic, V. Monti, F. sharma, R. tao, J. Wang, J. Zhang, H. Zhao, J Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) - Fudan University Shanghai China Zhejiang University Zhejiang Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics

the first measurement of the top quark pair (tt¯) production cross section in proton-proton collisions at s = 13.6 teV is presented. Data recorded with the CMs detector at the CERN LHC in summer 2022, corresponding to an integrated luminosity of 1.21 fb−1sup>, are analyzed. Events are selected with one or two charged leptons (electrons or muons) and additional jets. A maximum likelihood fit is performed in event categories defined by the number and flavors of the leptons, the number of jets, and the number of jets identified as originating from b quarks. An inclusive tt¯ production cross section of 881 ± 23 (stat + syst) ± 20 (lumi) pb is measured, in agreement with the standard model prediction of 924−40sub>+32sup> pb. © the Author(s) 2023.

关键词： Hadron-Hadron scattering top Physics

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