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arXiv 2020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. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Archilli, F. Artamonov, A. Artuso, M. Arzymatov, K. Aslanides, E. Atzeni, M. Audurier, B. Bachmann, S. Back, J.J. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barsuk, S. Barter, W. Bartolini, M. Baryshnikov, F. Basels, J.M. Bassi, G. Batozskaya, V. Batsukh, B. Battig, A. Bay, A. Becker, M. Bedeschi, F. Bediaga, I. Beiter, A. Belavin, V. Belin, S. Bellee, V. Belous, K. Belyaev, I. Bencivenni, G. Ben-Haim, E. Benson, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bernstein, H.C. Bertella, C. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.O. Bezshyiko, Ia. Bhasin, S. Bhom, J. Bieker, M.S. Bifani, S. Billoir, P. Bizzeti, A. Bjørn, M. Blago, M.P. Blake, T. Blanc, F. Blusk, S. Bobulska, D. Bocci, V. Boente Garcia, O. Boettcher, T. Boldyrev, A. Bondar, A. Bondar, N. Borghi, S. Borisyak, M. Borsato, M. Borsuk, J.T. Bowcock, T.J.V. Bozzi, C. Bradley, M.J. Braun, S. Brea Rodriguez, A. Brodski, M. Brodzicka, J. Brossa Gonzalo, A. Brundu, D. Buchanan, E. Büchler-Germann, A. Buonaura, A. Burr, C. Bursche, A. Butkevich, A. Butter, J.S. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calero Diaz, L. Cali, S. Calladine, R. Calvi, M. Calvo Gomez, M. Camargo Magalhaes, P. Camboni, A. Campana, P. Campora Perez, D.H. Campoverde Quezada, A.F. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carli, I. Carniti, P. Carvalho Akiba, K. Casais Vidal, A. Casse, G. Cattaneo, M. Cavallero, G. Celani, S. Cenci, R. Cerasoli, J. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chekalina, V. Chen, C. Chen, S. Chernov, A. Chitic, S.-G. Chobanova, V. Cholak, S. Chrzaszcz, M. Chubykin, A. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University 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 Beijing China Institute of Particle Physics Central China Normal University Wuhan Hubei China Univ. Grenoble Alpes 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 Universit Paris-Saclay CNRS IN2P3 IJCLab Orsay France91405 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-Bicocca Milano Italy INFN Sezione di Milano Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma Tor Vergata Roma Italy INFN Sezione di Roma La Sapienza Roma Italy Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Subatomic Physics VU University Amsterdam Amsterdam Netherlands Henryk Niewodniczanski Institute Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics

An angular analysis of the B0 → K∗0(→ K+π−)µ+µ− decay is presented using a data set corresponding to an integrated luminosity of 4.7 fb−1 of pp collision data collected with the LHCb experiment. The full set of CP-averaged observables are determined in bins of the invariant mass squared of the dimuon system. Contamination from decays with the K+π− system in an S-wave configuration is taken into account. The tension seen between the previous LHCb results and the Standard Model predictions persists with the new data. The precise value of the significance of this tension depends on the choice of theory nuisance parameters. Copyright © 2020, The Authors. All rights reserved.

关键词： Shear waves

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Observation of structure in the J/ψ-pair mass spectrum

arXiv

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arXiv 2020年

作者： Aaij, R. Beteta, C. Abellán Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C.A. Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Albero, A. Alfonso Aliouche, Z. Alkhazov, G. Cartelle, P. Alvarez Alves, A.A. Amato, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. 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. Rodriguez, P. Baladron Balagura, V. Baldini, W. Leite, J. Baptista Barlow, R.J. Barsuk, S. Barter, W. Bartolini, M. Baryshnikov, F. Basels, J.M. Bassi, G. Batozskaya, V. Batsukh, B. Battig, A. Bay, A. Becker, M. Bedeschi, F. Bediaga, I. Beiter, A. Belavin, V. Belin, S. Bellee, V. Belous, K. Belyaev, I. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Berninghoff, D. Bernstein, H.C. Bertella, C. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.O. Bezshyiko, Ia. Bhasin, S. Bhom, J. Bian, L. Bieker, M.S. Bifani, S. Billoir, P. Birch, M. Bishop, F.C.R. Bizzeti, A. Bjørn, M. Blago, M.P. Blake, T. Blanc, F. Blusk, S. Bobulska, D. Bocci, V. Boelhauve, J.A. Garcia, O. Boente 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. Rodriguez, A. Brea Brodski, M. Brodzicka, J. Gonzalo, A. Brossa Brundu, D. Buchanan, E. Buonaura, A. Burr, C. Bursche, A. Butkevich, A. Butter, J.S. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Diaz, L. Calero Cali, S. Calladine, R. Calvi, M. Gomez, M. Calvo Magalhaes, P. Camargo Camboni, A. Campana, P. Perez, D.H. Campora Quezada, A.F. Campoverde Capelli, S. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carli, I. Carniti, P. Akiba, K. Carvalho Vidal, A. Casais Casse, G. Cattaneo, M. Cavallero, G. Celani, S. Cenci, R. Cerasoli, J. Chadwick, A.J. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University 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 Beijing China Institute of Particle Physics Central China Normal University WuhanHubei China Univ. Grenoble Alpes 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 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-Bicocca Milano Italy INFN Sezione di Milano 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 Tor Vergata Roma Italy INFN Sezione di Roma La Sapienza Roma Italy Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Subatomic Physics VU University Amsterdam Amsterdam Netherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institut

Using proton-proton collision data at centre-of-mass energies of √s = 7, 8 and 13 TeV recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9 fb−1, the invariant mass spectrum of J/ψ pairs is studied. A narrow structure around 6.9 GeV/c2 matching the lineshape of a resonance and a broad structure just above twice the J/ψ mass are observed. The deviation of the data from nonresonant J/ψ-pair production is above five standard deviations in the mass region between 6.2 and 7.4 GeV/c2, covering predicted masses of states composed of four charm quarks. The mass and natural width of the narrow X(6900) structure are measured assuming a Breit–Wigner lineshape. Copyright © 2020, The Authors. All rights reserved.

关键词： Mass spectrometry

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Isospin transport phenomena for the systems Kr80+Ca40,48 at 35 MeV/nucleon

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Physical Review C 2021年第1期103卷 014603-014603页

作者： S. Piantelli G. Casini A. Ono G. Poggi G. Pastore S. Barlini M. Bini A. Boiano E. Bonnet B. Borderie R. Bougault M. Bruno A. Buccola A. Camaiani A. Chbihi C. Ciampi M. Cicerchia M. Cinausero M. Degerlier J. A. Dueñas Q. Fable D. Fabris J. D. Frankland C. Frosin F. Gramegna D. Gruyer A. Kordyasz T. Kozik J. Lemarié N. Le Neindre I. Lombardo O. Lopez G. Mantovani T. Marchi M. Henri L. Morelli A. Olmi P. Ottanelli M. Pârlog G. Pasquali J. Quicray A. A. Stefanini G. Tortone S. Upadhyaya S. Valdré G. Verde E. Vient M. Vigilante INFN Sezione di Firenze I-50019 Sesto Fiorentino Italy Department of Physics Tohoku University Sendai 980-8578 Japan Dipartimento di Fisica Università di Firenze I-50019 Sesto Fiorentino Italy INFN Sezione di Napoli 80126 Napoli Italy SUBATECH Université de Nantes IMT Atlantique IN2P3/CNRS 44307 Nantes Cedex 3 France Université Paris-Saclay CNRS/IN2P3 IJCLab 91405 Orsay France Normandie Univ ENSICAEN UNICAEN CNRS/IN2P3 LPC Caen F-14000 Caen France Dipartimento di Fisica Università di Bologna 40127 Bologna Italy INFN Sezione di Bologna 40127 Bologna Italy GANIL CEA/DRF-CNRS/IN2P3 14076 Caen France INFN Laboratori Nazionali di Legnaro 35020 Legnaro Italy Physics Department of Nevsehir Haci Bektas Veli University Nevsehir (Turkey) Departamento de Ingeniería Eléctrica y Centro de Estudios Avanzados en Física Matemáticas y Computación Universidad de Huelva 21007 Huelva Spain INFN Sezione di Padova 35131 Padova Italy Heavy Ion Laboratory University of Warsaw 02-093 Warszawa Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University 30-348 Cracow Poland INFN Sezione di Catania 95123 Catania Italy Dipartimento di Fisica Università di Padova 35131 Padova Italy Universidade de Santiago de Compostela Santiago de Compostela Spain “Horia Hulubei” National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH) P. O. Box MG-6 Bucharest Magurele Romania Dipartimento di Fisica Università di Napoli 80126 Napoli Italy

Experimental data concerning isospin transport phenomena for the systems Kr80+Ca40,48 at 35 MeV/nucleon are presented. Data have been collected with four FAZIA blocks; this data set is the same analyzed in S. Piantelli et al., Phys. Rev. C 101, 034613 (2020). The isotopic composition of the QuasiProjectile residue (up to Z around 25) and of its decay products in the two reactions are compared, finding a neutron enrichment when the target is Ca48. The isotopic composition of the emitted light charged particles (LCP) and intermediate mass fragments (IMF) was also investigated in different windows of velocity. The obtained results have been compared with the prediction of the transport model AMD followed by the statistical code GEMINI (used as an afterburner), with different recipes for the density dependence of the symmetry energy term in the nuclear equation of state. A weak indication in favor of a stiff symmetry energy emerges when the fragments emitted at midvelocity are examined.

关键词： Low & intermediate energy heavy-ion reactions Models & methods for nuclear reactions Nuclear fragmentation Transfer reactions

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Spin filtering effect generated by the inter-subband spin-orbit coupling in the bilayer nanowire with the quantum point contact

arXiv

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arXiv 2017年

作者： Wójcik, Pawel Adamowski, Janusz Agh University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków Poland

The spin filtering effect in the bilayer nanowire with quantum point contact is investigated theoretically. We demonstrate the new mechanism of the spin filtering based on the lateral inter-subband spin-orbit coupling, which for the bilayer nanowires has been reported to be strong. The proposed spin filtering effect is explained as the joint effect of the Landau-Zener inter-subband transitions caused by the hybridization of states with opposite spin (due to the lateral Rashba SO interaction) and the confinement of carriers in the quantum point contact region. Copyright © 2017, The Authors. All rights reserved.

关键词： Nanowires

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Observation of new Ξc0 baryons decaying to Λ+c K−

arXiv

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arXiv 2020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. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Archilli, F. Artamonov, A. Artuso, M. Arzymatov, K. Aslanides, E. Atzeni, M. Audurier, B. Bachmann, S. Back, J.J. Baker, S. Balagura, V. Baldini, W. Baptista Leite, J. Barlow, R.J. Barsuk, S. Barter, W. Bartolini, M. Baryshnikov, F. Basels, J.M. Bassi, G. Batozskaya, V. Batsukh, B. Battig, A. Bay, A. Becker, M. Bedeschi, F. Bediaga, I. Beiter, A. Belavin, V. Belin, S. Bellee, V. Belous, K. Belyaev, I. Bencivenni, G. Ben-Haim, E. Benson, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bernstein, H.C. Bertella, C. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.O. Bezshyiko, Ia. Bhasin, S. Bhom, J. Bieker, M.S. Bifani, S. Billoir, P. Bizzeti, A. Bjørn, M. Blago, M.P. Blake, T. Blanc, F. Blusk, S. Bobulska, D. Bocci, V. Boente Garcia, O. Boettcher, T. Boldyrev, A. Bondar, A. Bondar, N. Borghi, S. Borisyak, M. Borsato, M. Borsuk, J.T. 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. Buchanan, E. Büchler-Germann, A. Buonaura, A. Burr, C. Bursche, A. Butkevich, A. Butter, J.S. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calero Diaz, L. Cali, S. Calladine, R. Calvi, M. Calvo Gomez, M. Camargo Magalhaes, P. Camboni, A. Campana, P. Campora Perez, D.H. Campoverde Quezada, A.F. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carli, I. Carniti, P. Carvalho Akiba, K. Casais Vidal, A. Casse, G. Cattaneo, M. Cavallero, G. Celani, S. Cenci, R. Cerasoli, J. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chekalina, V. Chen, C. Chen, S. Chernov, A. Chitic, S.-G. Chobanova, V. Cholak, S. Chrzaszcz, M. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University 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 Beijing China Institute of Particle Physics Central China Normal University Wuhan Hubei China Univ. Grenoble Alpes 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 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-Bicocca Milano Italy INFN Sezione di Milano Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma Tor Vergata Roma Italy INFN Sezione di Roma La Sapienza Roma Italy Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Subatomic Physics VU University Amsterdam Amsterdam Netherlands Henryk Niewodniczanski Institute Nuclear Physics Polish Academy of Sciences Kraków Poland AGH University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engi

The Λ+c K− mass spectrum is studied with a data sample of pp collisions at a centreof-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb−1 collected by the LHCb experiment. Three Ξc0 states are observed with a large significance and their masses and natural widths are measured to be m(Ξc(2923)0) = 2923.04 ± 0.25 ± 0.20 ± 0.14 MeV, Γ(Ξc(2923)0) = 7.1 ± 0.8 ± 1.8 MeV, m(Ξc(2939)0) = 2938.55 ± 0.21 ± 0.17 ± 0.14 MeV, Γ(Ξc(2939)0) = 10.2 ± 0.8 ± 1.1 MeV, m(Ξc(2965)0) = 2964.88 ± 0.26 ± 0.14 ± 0.14 MeV, Γ(Ξc(2965)0) = 14.1 ± 0.9 ± 1.3 MeV, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λ+c mass. The Ξc(2923)0 and Ξc(2939)0 baryons are new states. The Ξc(2965)0 state is in the vicinity of the known Ξc(2970)0 baryon;however, their masses and natural widths differ significantly. Copyright © 2020, The Authors. All rights reserved.

关键词： Hadrons

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Large directed flow of open charm mesons probes the three dimensional distribution of matter in heavy ion collisions

arXiv

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arXiv 2017年

作者： Chatterjee, Sandeep Bozek, Piotr Agh University of Science and Technology Faculty of Physics and Applied Computer Science aleja Mickiewicza 30 Krakow30-059 Poland

Thermalized matter created in non-central relativistic heavy-ion collisions is expected to be tilted in the reaction plane with respect to the beam axis. The most notable consequence of this forward-backward symmetry breaking is the observation of rapidity-odd directed flow for charged particles. On the other hand, the production points for heavy quarks are forward-backward symmetric and shifted in the transverse plane with respect to the fireball. The drag on heavy quarks from the asymmetrically distributed thermalized matter generates substantial directed flow for heavy avor mesons. We predict a very large rapidity odd directed flow of D mesons in non-central Au-Au collisions at √ sNN= 200 GeV, several times larger than for charged particles. A possible experimental observation of a large directed flow for heavy flavor mesons would represent an almost direct probe of the 3-dimensional distribution of matter in heavy-ion collisions. Copyright © 2017, The Authors. All rights reserved.

关键词： Hadrons

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Measurement of the branching fraction of the decay Bs0→KS0KS0

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Physical Review D 2020年第1期102卷 012011-012011页

作者： R. Aaij C. Abellán Beteta T. Ackernley B. Adeva M. Adinolfi H. Afsharnia C. A. Aidala S. Aiola Z. Ajaltouni S. Akar P. Albicocco J. Albrecht F. Alessio M. Alexander A. Alfonso Albero G. Alkhazov P. Alvarez Cartelle A. A. Alves, Jr. S. Amato Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti F. Archilli J. Arnau Romeu A. Artamonov M. Artuso K. Arzymatov E. Aslanides M. Atzeni B. Audurier S. Bachmann J. J. Back S. Baker V. Balagura W. Baldini A. Baranov R. J. Barlow S. Barsuk W. Barter M. Bartolini F. Baryshnikov G. Bassi V. Batozskaya B. Batsukh A. Battig V. Battista A. Bay M. Becker F. Bedeschi I. Bediaga A. Beiter L. J. Bel V. Belavin S. Belin N. Beliy V. Bellee K. Belous I. Belyaev G. Bencivenni E. Ben-Haim S. Benson S. Beranek A. Berezhnoy R. Bernet D. Berninghoff H. C. Bernstein E. Bertholet A. Bertolin C. Betancourt F. Betti M. O. Bettler Ia. Bezshyiko S. Bhasin J. Bhom M. S. Bieker S. Bifani P. Billoir A. Bizzeti M. Bjørn M. P. Blago T. Blake F. Blanc S. Blusk D. Bobulska V. Bocci O. Boente Garcia T. Boettcher A. Boldyrev A. Bondar N. Bondar S. Borghi M. Borisyak M. Borsato J. T. Borsuk T. J. V. Bowcock C. Bozzi S. Braun A. Brea Rodriguez M. Brodski J. Brodzicka A. Brossa Gonzalo D. Brundu E. Buchanan A. Büchler-Germann A. Buonaura C. Burr A. Bursche J. S. Butter J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese S. Cali R. Calladine M. Calvi M. Calvo Gomez A. Camboni P. Campana D. H. Campora Perez L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini P. Carniti K. Carvalho Akiba A. Casais Vidal G. Casse M. Cattaneo G. Cavallero R. Cenci J. Cerasoli M. G. Chapman M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville V. Chekalina C. Chen S. Chen A. Chernov S.-G. Chitic V. Chobanova M. Chrzaszcz A. Chubykin P. Ciambrone M. F. Cicala X. Cid Vidal G. Ciezarek F. Cindolo P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier J. L. Cobbledick V. Coco J. A. B. Coelho J. Cogan E. Cogneras L. Cojocariu P. Collins T. Colombo A. Comerma-Montells A. Contu N. Cooke G. Coombs S. Coquereau G. Corti C Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Physik-Institut Universität Zürich Zürich Switzerland Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Instituto Galego de Física de Altas Enerxías (IGFAE) Universidade de Santiago de Compostela Santiago de Compostela Spain H. H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France University of Michigan Ann Arbor Michigan USA (associated Syracuse University Syracuse New York USA) INFN Sezione di Milano Milano Italy University of Cincinnati Cincinnati Ohio USA INFN Laboratori Nazionali di Frascati Frascati Italy Fakultät Physik Technische Universität Dortmund Dortmund Germany European Organization for Nuclear Research (CERN) Geneva Switzerland School of Physics and Astronomy University of Glasgow Glasgow United Kingdom ICCUB Universitat de Barcelona Barcelona Spain Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI) Gatchina Russia Imperial College London London United Kingdom Universidade Federal do Rio de Janeiro (UFRJ) Rio de Janeiro Brazil Université Paris-Saclay CNRS/IN2P3 IJCLab Orsay France INFN Sezione di Firenze Firenze Italy Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland INFN Sezione di Ferrara Ferrara Italy Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI) Protvino Russia Protvino Russia Syracuse University Syracuse New York USA Yandex School of Data Analysis Moscow Russia INFN Sezione di Cagliari Monserrato Italy Department of Physics University of Warwick Coventry United Kingdom Department of Physics and Astronomy University of Manchester Manchester United Kingdom INFN Sezione di Genova Genova Italy INFN Sezione di Pisa Pis

A measurement of the branching fraction of the decay Bs0→KS0KS0 is performed using proton–proton collision data corresponding to an integrated luminosity of 5 fb−1 collected by the LHCb experiment between 2011 and 2016. The branching fraction is determined to be B(Bs0→KS0KS0)=[8.3±1.6(stat)±0.9(syst)±0.8(norm)±0.3(fs/fd)]×10−6, where the first uncertainty is statistical, the second is systematic, and the third and fourth are due to uncertainties on the branching fraction of the normalization mode B0→ϕKS0 and the ratio of hadronization fractions fs/fd. This is the most precise measurement of this branching fraction to date. Furthermore, a measurement of the branching fraction of the decay B0→KS0KS0 is performed relative to that of the Bs0→KS0KS0 channel, and is found to be B(B0→KS0KS0)B(Bs0→KS0KS0)=[7.5±3.1(stat)±0.5(syst)±0.3(fs/fd)]×10−2.

关键词： Branching fraction Flavor changing neutral currents Hadronic decays

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Feasibility studies for the measurement of time-like proton electromagnetic form factors from pp ¯ → µ+µ− at PANDA at FAIR

arXiv

引用

arXiv 2020年

作者： Barucca, G. Davì, F. Lancioni, G. Mengucci, P. Montalto, L. Natali, P.P. Paone, N. Rinaldi, D. Scalise, L. Erni, W. Krusche, B. Steinacher, M. Walford, N. Cao, N. Liu, Z. Liu, C. Liu, B. Shen, X. Sun, S. Tao, J. Xiong, X.A. Zhao, G. Zhao, J. Albrecht, M. Alkakhi, W. Bökelmann, S. Feldbauer, F. Fink, M. Frech, J. Freudenreich, V. Fritsch, M. Hagdorn, R. Heinsius, F.H. Held, T. Holtmann, T. Keshk, I. Koch, H. Kopf, B. Kuhlmann, M. Kümmel, M. Küßner, M. Mustafa, A. Pelizäus, M. Pitka, A. Reher, J. Reicherz, G. Richter, M. Schnier, C. Sohl, L. Steinke, M. Triffterer, T. Wenzel, C. Wiedner, U. Denizli, H. Er, N. Beck, R. Hammann, C. Hartmann, J. Ketzer, B. Müllers, J. Rossbach, M. Salisbury, B. Schmidt, C. Thoma, U. Urban, M. Bianconi, A. Bragadireanu, M. Pantea, D. Domagala, M. Filo, G. Lisowski, E. Lisowski, F. Michalek, M. Poznański, P. Plażek, J. Korcyl, K. Kozela, A. Lebiedowicz, P. Pysz, K. Schäfer, W. Szczurek, A. Fiutowski, T. Idzik, M. Swientek, K. Terlecki, P. Korcyl, G. Lalik, R. Malige, A. Moskal, P. Nowakowski, K. Przygoda, W. Rathod, N. Rudy, Z. Salabura, P. Smyrski, J. Augustin, I. Böhm, R. Lehmann, I. Schmitt, L. Varentsov, V. Al-Turany, M. Belias, A. Deppe, H. Dzhygadlo, R. Flemming, H. Gerhardt, A. Götzen, K. Heinz, A. Jiang, P. Karabowicz, R. Koch, S. Kurilla, U. Lehmann, D. Lühning, J. Lynen, U. Orth, H. Peters, K. Rieger, J. Saito, T. Schepers, G. Schmidt, C.J. Schwarz, C. Schwiening, J. Täschner, A. Traxler, M. Voss, B. Wieczorek, P. Abazov, V. Alexeev, G. Arefiev, V.A. Astakhov, V. Barabanov, M. Yu Batyunya, B.V. Dodokhov, V. Kh Efremov, A. Fechtchenko, A. Galoyan, A. Golovanov, G. Koshurnikov, E.K. Lobanov, Y. Yu Olshevskiy, A.G. Piskun, A.A. Samartsev, A. Shimanski, S. Skachkov, N.B. Skachkova, A.N. Strokovsky, E.A. Tokmenin, V. Uzhinsky, V. Verkheev, A. Vodopianov, A. Zhuravlev, N.I. Branford, D. Watts, D. Böhm, M. Eyrich, W. Lehmann, A. Miehling, D. Pfaffinger, M. Università Politecnica delle Marche-Ancona Ancona Italy Universität Basel Basel Switzerland Institute of High Energy Physics Chinese Academy of Sciences Beijing China Ruhr-Universität Bochum Institut für Experimentalphysik I Bochum Germany Department of Physics Bolu Abant Izzet Baysal University Bolu Turkey Rheinische Friedrich-Wilhelms-Universität Bonn Bonn Germany Università di Brescia Brescia Italy Institutul National de C&D pentru Fizica si Inginerie Nucleara "Horia Hulubei" Bukarest-Magurele Romania University of Technology Institute of Applied Informatics Cracow Poland IFJ Institute of Nuclear Physics PAN Cracow Poland AGH University of Science and Technology Cracow Poland Instytut Fizyki Uniwersytet Jagiellonski Cracow Poland FAIR Facility for Antiproton and Ion Research in Europe Darmstadt Germany GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany Joint Institute for Nuclear Research Dubna Russia University of Edinburgh Edinburgh United Kingdom Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Germany Northwestern University Evanston United States Università di Ferrara INFN Sezione di Ferrara Ferrara Italy Goethe-Universität Institut für Kernphysik Frankfurt Germany Frankfurt Institute for Advanced Studies Frankfurt Germany INFN Laboratori Nazionali di Frascati Frascati Italy Dept of Physics University of Genova and INFN-Genova Genova Italy Justus-Liebig-Universität Gießen II Physikalisches Institut Gießen Germany IRFU CEA Université Paris-Saclay Gif-sur-Yvette Cedex France University of Glasgow Glasgow United Kingdom Birla Institute of Technology and Science Pilani K K Birla Goa Campus Goa India University of Groningen Groningen Netherlands Gauhati University Physics Department Guwahati India University of Science and Technology of China Hefei China Universität Heidelberg Heidelberg Germany Department of Physics Dogus University Istanbul Turkey Forschungszentrum Jülich Institut für Kernphysik

This paper reports on Monte Carlo simulation results for future measurements of time-like proton electromagnetic form factors, |GE| and |GM|, using the pp ¯ → µ+µ− reaction at PANDA (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at PANDA, using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is pp ¯ → π+π−, due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distributions of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented. Copyright © 2020, The Authors. All rights reserved.

关键词： Uncertainty analysis

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State transition at electrohydrodynamic convection of twisted nematic liquid crystals

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Physical Review E 2018年第5期98卷 052704-052704页

作者： Chul Gyu Jhun Gyu Jin Choi Dae Geon Ryu Jong-Hoon Huh Jin Seog Gwag School of Display Engineering Hoseo University Asan-shi Chungnam 31499 Republic of Korea Department of Physics Yeungnam University 280 Daehak-Ro Gyeongsan 38541 Republic of Korea Department of Mechanical Information Science and Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka 820–8502 Japan

We study electrohydrodynamic convection (EHC) patterns in twisted nematic liquid crystal (TNCL) cells with an initial homeotropic alignment. In addition, we demonstrate switching characteristics due to the transition between the 90° and −90∘ twisted states. The pattern formations are similar to those obtained in a parallel-aligned nontwisted liquid crystal cell. Calculations of the free energy in an initially, homeotropically aligned TNLC in an electric field demonstrate that the energy barrier between the two states decreases with the increase of the electric field. The mutual transition is caused by the fluctuating flow at the dynamic scattering mode 2, where the energy barrier between the two states is reduced by applying a strong electric field. These properties may be employed for the development of a redirectable dynamic lenticular lens, as an extended version of the dynamic lenticular lens using EHC. The transition between the two states caused by EHC is reversible, and the convection roll pattern of the Williams domain rotates by 90° at each transition.

关键词： Convection Nematic liquid crystals Hydrodynamics

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Electron beam welding of high strength quenched and tempered steel 9th

Electron beam welding of high strength quenched and tempered...

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9th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2016

作者： Węglowski, Marek Stanislaw Blacha, Sylwester Dymek, Stanislaw Kopyściański, Mateusz Department of the Testing of Materials Weldability and Welded Construction Institute of Welding Gliwice Poland Faculty of Metal Engineering and Industrial Computer Science AGH University of Science and Technology Krakow Poland

ISBN: (纸本)9783035711295

The paper deals with the investigation of microstructure and mechanical properties of electron beam welded joints of high strength steel grades S690QL and S960QL in quenched and tempered condition. The microstructure of base metal was composed of bainite and martensite mixture at hardness about 270HV10 and 340HV10 for the S690QL and S960QL steels, respectively. The weldment was composed of several characteristic subzones revealed on the transverse sections. The central region of the weldment consisted mainly of coarse columnar dendritic grains which perpendicular to the fusion zone boundary. The microstructure of the heat affected zone near the fusion line consisted mainly of martensite, however, in both steels the microstructure varied with the distance from the fusion line. The tensile strengths of welded oints were Rm=850 MPa (S690QL) and 1074MPa (S960QL) and corresponded the tensile strengths of the base materials. © 2017 Trans Tech Publications, Switzerland.

关键词： Electron beam welding

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