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Physical Review D 2021年第1期103卷 012004-012004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 J. Albrecht F. Alessio M. Alexander A. Alfonso Albero Z. Aliouche G. Alkhazov P. Alvarez Cartelle S. Amato Y. Amhis L. An L. Anderlini A. Andreianov M. Andreotti F. Archilli A. Artamonov M. Artuso K. Arzymatov E. Aslanides M. Atzeni B. Audurier S. Bachmann M. Bachmayer J. J. Back S. Baker P. Baladron Rodriguez V. Balagura W. Baldini J. Baptista Leite R. J. Barlow S. Barsuk W. Barter M. Bartolini F. Baryshnikov J. M. Basels G. Bassi B. Batsukh A. Battig A. Bay M. Becker F. Bedeschi I. Bediaga A. Beiter V. Belavin S. Belin V. Bellee K. Belous I. Belov I. Belyaev G. Bencivenni E. Ben-Haim A. Berezhnoy R. Bernet D. Berninghoff H. C. Bernstein C. Bertella E. Bertholet A. Bertolin C. Betancourt F. Betti M. O. Bettler Ia. Bezshyiko S. Bhasin J. Bhom L. Bian M. S. Bieker S. Bifani P. Billoir M. Birch F. C. R. Bishop A. Bizzeti M. Bjørn M. P. Blago T. Blake F. Blanc S. Blusk D. Bobulska J. A. Boelhauve O. Boente Garcia T. Boettcher A. Boldyrev A. Bondar N. Bondar S. Borghi M. Borisyak M. Borsato J. T. Borsuk S. A. Bouchiba T. J. V. Bowcock A. Boyer C. Bozzi M. J. Bradley S. Braun A. Brea Rodriguez M. Brodski J. Brodzicka A. Brossa Gonzalo D. Brundu A. Buonaura C. Burr A. Bursche A. Butkevich J. S. Butter J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese L. Calefice L. Calero Diaz S. Cali R. Calladine M. Calvi M. Calvo Gomez P. Camargo Magalhaes A. Camboni P. Campana D. H. Campora Perez A. F. Campoverde Quezada S. Capelli L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini I. Carli P. Carniti K. Carvalho Akiba A. Casais Vidal G. Casse M. Cattaneo G. Cavallero S. Celani J. Cerasoli A. J. Chadwick M. G. Chapman M. Charles Ph. Charpentier G. Chatzikonstantinidis C. A. Chavez Barajas M. Chefdeville C. Chen S. Chen A. Chernov S.-G. Chitic V. Chobanova S. Cholak M. Chrzaszcz A. Chubykin V. Chulikov P. Ciambrone M. F. Cicala X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier J. 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 USA (associated with Syracuse University Syracuse New York USA) INFN Sezione di Milano Milano Italy University of Cincinnati Cincinnati Ohio USA 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 Department of Physics and Astronomy University of Manchester Manchester United Kingdom Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI) Gatchina Russia 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 INFN Sezione di Ferrara Ferrara Italy Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany 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 Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Department of Physics University of Warwick Coventry United Kingdom Imperial College London London United Kingdom Centro Brasileiro de Pesquisas Físicas (CBPF) Rio de Janeiro Brazil INFN Sezione di Genova Genova Italy National University of Science and Technology “MISIS” Mosco

Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5 fb−1, the observation of a new excited Ξb0 resonance decaying to the Ξb−π+ final state is presented. The state, referred to as Ξb(6227)0, has a measured mass and natural width of m(Ξb(6227)0)=6227.1−1.5+1.4±0.5 MeV and Γ(Ξb(6227)0)=18.6−4.1+5.0±1.4 MeV, where the uncertainties are statistical and systematic. The production rate of the Ξb(6227)0 state relative to that of the Ξb− baryon in the kinematic region 2<η<5 and pT<30 GeV is measured to be fΞb(6227)0fΞb−B(Ξb(6227)0→Ξb−π+)=0.045±0.008±0.004, where B(Ξb(6227)0→Ξb−π+) is the branching fraction of the decay, and fΞb(6227)0 and fΞb− represent fragmentation fractions. Improved measurements of the mass and natural width of the previously observed Ξb(6227)− state, along with the mass of the Ξb− baryon, are also reported. Both measurements are significantly more precise than, and consistent with, previously reported values.

关键词： Bottom baryons

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Model-independent searches of new physics in DARWIN with a semi-supervised deep learning pipeline

arXiv

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arXiv 2024年

作者： Aalbers, J. Abe, K. Adrover, M. Ahmed Maouloud, S. Althueser, L. Amaral, D.W.P. Andrieu, B. Angelino, E. Antón Martin, D. Antunovic, B. Aprile, E. Babicz, M. Bajpai, D. Balzer, M. Barberio, E. Baudis, L. Bazyk, M. Bell, N.F. Bellagamba, L. Biondi, R. Biondi, Y. Bismark, A. Boehm, C. Boese, K. Braun, R. Breskin, A. Brommer, S. Brown, A. Bruni, G. Budnik, R. Cai, C. Capelli, C. Chauvin, A. Cimental Chavez, A.P. Colijn, A.P. Conrad, J. Cuenca-García, J.J. D'Andrea, V. Daniel Garcia, L.C. Decowski, M.P. Deisting, A. Di Donato, C. Di Gangi, P. Diglio, S. Doerenkamp, M. Drexlin, G. Eitel, K. Elykov, A. Engel, R. Ferella, A.D. Ferrari, C. Fischer, H. Flehmke, T. Flierman, M. Fujikawa, K. Fulgione, W. Fuselli, C. Gaemers, P. Gaior, R. Galloway, M. Gao, F. Garroum, N. Giacomobono, R. Girard, F. Glade-Beucke, R. Glück, F. Grandi, L. Grigat, J. Größle, R. Guan, H. Guida, M. Gyorgy, P. Hammann, R. Hannen, V. Hansmann-Menzemer, S. Hargittai, N. Higuera, A. Hils, C. Hiraoka, K. Hoetzsch, L. Hoferichter, M. Hood, N.F. Iacovacci, M. Itow, Y. Jakob, J. James, R.S. Joerg, F. Kahlert, F. Kaminaga, Y. Kara, M. Kavrigin, P. Kazama, S. Keller, M. Kharbanda, P. Kilminster, B. Kleifges, M. Klute, M. Kobayashi, M. Koke, D. Kopec, A. von Krosigk, B. Kuger, F. LaCascio, L. Landsman, H. Lang, R.F. Levinson, L. Li, I. Li, A. Li, S. Liang, S. Liang, Z. Lin, Y.-T. Lindemann, S. Lindner, M. Liu, K. Loizeau, J. Lombardi, F. Long, J. Lopes, J.A.M. Lucchetti, G.M. Luce, T. Ma, Y. Macolino, C. Mahlstedt, J. Maier, B. Mancuso, A. Manenti, L. Marignetti, F. Martens, K. Masbou, J. Masson, E. Mastroianni, S. Melchiorre, A. Menéndez, J. Messina, M. Milosovic, B. Milutinovic, S. Miuchi, K. Miyata, R. Molinario, A. Monteiro, C.M.B. Morå, K. Moriyama, S. Morteau, E. Mosbacher, Y. Müller, J. Murra, M. Newstead, J.L. Ni, K. O'Hare, C. Oberlack, U. Obradovic, M. Ostrowskiy, I. Ouahada, S. Paetsch, B. Pan, Y. Pandurovic, M. Pellegrini, Q. Nikhef The University of Groningen Van Swinderen Institute Groningen9747AG Netherlands University of Tokyo Higashi-Mozumi Kamioka Gifu Hida506-1205 Japan Physik-Institut University of Zürich Zürich8057 Switzerland LPNHE Sorbonne Université CNRS IN2P3 Paris75005 France Institute for Nuclear Physics University of Münster Münster48149 Germany Department of Physics and Astronomy Rice University HoustonTX77005 United States INAF-Astrophysical Observatory of Torino Department of Physics University of Torino INFN-Torino Torino10125 Italy INFN-Laboratori Nazionali del Gran Sasso Gran Sasso Science Institute L'Aquila67100 Italy Department of Physics Enrico Fermi Institute Kavli Institute for Cosmological Physics University of Chicago ChicagoIL60637 United States Vinca Institute of Nuclear Science University of Belgrade Mihajla Petrovica Alasa 12-14 Belgrade Serbia Physics Department Columbia University New YorkNY10027 United States Department of Physics & Astronomy University of Alabama TuscaloosaAL34587-0324 United States Institute for Data Processing and Electronics Karlsruhe Institute of Technology Karlsruhe76021 Germany ARC Centre of Excellence for Dark Matter Particle Physics School of Physics The University of Melbourne VIC3010 Australia SUBATECH IMT Atlantique CNRS IN2P3 Nantes Université Nantes44307 France Department of Physics and Astronomy University of Bologna INFN-Bologna Bologna40126 Italy Max-Planck-Institut für Kernphysik Heidelberg69117 Germany Institute for Astroparticle Physics Karlsruhe Institute of Technology Karlsruhe76021 Germany School of Physics The University of Sydney Camperdown SydneyNSW2006 Australia Department of Particle Physics and Astrophysics Weizmann Institute of Science Rehovot7610001 Israel Institute of Experimental Particle Physics Karlsruhe Institute of Technology Karlsruhe76021 Germany Physikalisches Institut Universität Freiburg Freiburg79104 Germany Department of Physics and

We present a novel deep learning pipeline to perform a model-independent, likelihood-free search for anomalous (i.e., non-background) events in the proposed next generation multi-ton scale liquid Xenon-based direct detection experiment, DARWIN. We train an anomaly detector comprising a variational autoencoder and a classifier on extensive, high-dimensional simulated detector response data and construct a one-dimensional anomaly score optimised to reject the background only hypothesis in the presence of an excess of non-background-like events. We benchmark the procedure with a sensitivity study that determines its power to reject the background-only hypothesis in the presence of an injected WIMP dark matter signal, outperforming the classical, likelihood-based background rejection test. We show that our neural networks learn relevant energy features of the events from low-level, high-dimensional detector outputs, without the need to compress this data into lower-dimensional observables, thus reducing computational effort and information loss. For the future, our approach lays the foundation for an efficient end-to-end pipeline that eliminates the need for many of the corrections and cuts that are traditionally part of the analysis chain, with the potential of achieving higher accuracy and significant reduction of analysis time. Copyright © 2024, The Authors. All rights reserved.

关键词： Self-supervised learning

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Observation of excited Ωc0 baryons in Ωb−→Ξc+K−π− decays

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Physical Review D 2021年第9期104卷 L091102-L091102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 J. Albrecht F. Alessio M. Alexander A. Alfonso Albero Z. Aliouche G. Alkhazov P. Alvarez Cartelle S. Amato Y. Amhis L. An L. Anderlini A. Andreianov M. Andreotti F. Archilli A. Artamonov M. Artuso K. Arzymatov E. Aslanides M. Atzeni B. Audurier S. Bachmann M. Bachmayer J. J. Back P. Baladron Rodriguez V. Balagura W. Baldini J. Baptista Leite R. J. Barlow S. Barsuk W. Barter M. Bartolini F. Baryshnikov J. M. Basels G. Bassi B. Batsukh A. Battig A. Bay M. Becker F. Bedeschi I. Bediaga A. Beiter V. Belavin S. Belin V. Bellee K. Belous I. Belov I. Belyaev G. Bencivenni E. Ben-Haim A. Berezhnoy R. Bernet D. Berninghoff H. C. Bernstein C. Bertella A. Bertolin C. Betancourt F. Betti Ia. Bezshyiko S. Bhasin J. Bhom L. Bian M. S. Bieker S. Bifani P. Billoir M. Birch F. C. R. Bishop A. Bitadze A. Bizzeti M. Bjørn M. P. Blago T. Blake F. Blanc S. Blusk D. Bobulska J. A. Boelhauve O. Boente Garcia T. Boettcher A. Boldyrev A. Bondar N. Bondar S. Borghi M. Borisyak M. Borsato J. T. Borsuk S. A. Bouchiba T. J. V. Bowcock A. Boyer C. Bozzi M. J. Bradley S. Braun A. Brea Rodriguez M. Brodski J. Brodzicka A. Brossa Gonzalo D. Brundu A. Buonaura C. Burr A. Bursche A. Butkevich J. S. Butter J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese L. Calefice L. Calero Diaz S. Cali R. Calladine M. Calvi M. Calvo Gomez P. Camargo Magalhaes P. Campana A. F. Campoverde Quezada S. Capelli L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini I. Carli P. Carniti L. Carus K. Carvalho Akiba A. Casais Vidal G. Casse M. Cattaneo G. Cavallero S. Celani J. Cerasoli A. J. Chadwick M. G. Chapman M. Charles Ph. Charpentier G. Chatzikonstantinidis C. A. Chavez Barajas M. Chefdeville C. Chen S. Chen A. Chernov V. Chobanova S. Cholak M. Chrzaszcz A. Chubykin V. Chulikov P. Ciambrone M. F. Cicala X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier J. L. Cobbledick V. Coco J. A. B. Coelho J. Cogan E. Cogneras 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 USA (associated with Syracuse University Syracuse New York USA) INFN Sezione di Milano Milano Italy University of Cincinnati Cincinnati Ohio USA 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 Department of Physics and Astronomy University of Manchester Manchester United Kingdom Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI) Gatchina Russia Cavendish Laboratory University of Cambridge Cambridge 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 INFN Sezione di Ferrara Ferrara Italy Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI) Protvino Russia Syracuse University Syracuse New York USA Yandex School of Data Analysis Moscow Russia Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Department of Physics University of Warwick Coventry United Kingdom Centro Brasileiro de Pesquisas Físicas (CBPF)

The first observation of the Ωb−→Ξc+K−π− decay is reported using p p collision data at center of mass energies of 7, 8, and 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. Four excited Ωc0 baryons are observed in the Ξc+ K− mass projection of the Ωb−→Ξc+K−π− decays with the significance of each exceeding five standard deviations. They coincide with the states previously observed in prompt pp and e+e− production. Relative production rates, masses, and natural widths of the states are measured, and a test of spin hypotheses is performed. Moreover, the branching ratio of Ωb−→Ξc+K−π− is measured relative to the Ωb−→Ωc0π− decay mode and a precise measurement of the Ωb− mass of 6044.3±1.2±1.1−0.22+0.19 MeV is obtained.

关键词： Branching fraction Hadronic decays Bottom baryons Charmed baryons Mass Parity Spin Hadron colliders

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γ-ray strength function for thallium isotopes relevant to the Pb205−Tl205 chronometry

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Physical Review C 2019年第2期99卷 024609-024609页

作者： H. Utsunomiya T. Renstrøm G. M. Tveten S. Goriely T. Ari-izumi D. Filipescu J. Kaur Y.-W. Lui W. Luo S. Miyamoto A. C. Larsen S. Hilaire S. Péru A. J. Koning Konan University Department of Physics 8-9-1 Okamoto Higashinada Japan Department of Physics University of Oslo N-0316 Oslo Norway Institut d'Astronomie et d'Astrophysique Université Libre de Bruxelles Campus de la Plaine CP-226 1050 Brussels Belgium National Institute for Physics and Nuclear Engineering Horia Hulubei (IFIN-HH) 30 Reactorului 077125 Bucharest-Magurele Romania Extreme Light Infrastructure Nuclear Physics “Horia Hulubei” National Institute for Physics and Nuclear Engineering (IFIN-HH) 30 Reactorului 077125 Bucharest-Magurele Romania Cyclotron Institute Texas A&M University College Station Texas 77843 USA School of Nuclear Science and Technology University of South China Hengyang 421001 China Laboratory of Advanced Science and Technology for Industry University of Hyogo 3-1-2 Kouto Kamigori Ako-gun Hyogo 678-1205 Japan CEA DAM DIF F-91297 Arpajon France Nuclear Data Section International Atomic Energy Agency A-1400 Vienna Austria

Photoneutron cross sections were measured for Tl203 and Tl205 at energies between the one- and two-neutron thresholds using quasimonochromatic γ-ray beams produced in laser Compton scattering at the NewSUBARU synchrotron radiation facility. Our measurement results in cross sections significantly different from the previously reported bremsstrahlung experiment, leading to rather different giant dipole resonance (GDR) parameters, in particular to lower GDR peak energies and higher peak cross sections. The photoneutron data are used to constrain the γ-ray strength function on the basis of the Hartree-Fock-Bogolyubov plus quasiparticle random-phase approximation using the Gogny D1M interaction. Supplementing the experimentally constrained γ-ray strength function with the zero-limit E1 and M1 contributions for the de-excitation mode, we estimate the Maxwellian-averaged cross section for the s-process branching-point nucleus Tl204 in the context of the Pb205−Tl205 chronometry.

关键词： Hydrostatic stellar nucleosynthesis Lifetimes & widths nuclear astrophysics nuclear reactions Photonuclear reactions Thermal & statistical models 190 ≤ A ≤ 219

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Search for CP violation in Ξb−→pK−K− decays

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Physical Review D 2021年第5期104卷 052010-052010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 J. Albrecht F. Alessio M. Alexander A. Alfonso Albero Z. Aliouche G. Alkhazov P. Alvarez Cartelle S. Amato Y. Amhis L. An L. Anderlini A. Andreianov M. Andreotti F. Archilli A. Artamonov M. Artuso K. Arzymatov E. Aslanides M. Atzeni B. Audurier S. Bachmann M. Bachmayer J. J. Back P. Baladron Rodriguez V. Balagura W. Baldini J. Baptista Leite R. J. Barlow S. Barsuk W. Barter M. Bartolini F. Baryshnikov J. M. Basels G. Bassi B. Batsukh A. Battig A. Bay M. Becker F. Bedeschi I. Bediaga A. Beiter V. Belavin S. Belin V. Bellee K. Belous I. Belov I. Belyaev G. Bencivenni E. Ben-Haim A. Berezhnoy R. Bernet D. Berninghoff H. C. Bernstein C. Bertella A. Bertolin C. Betancourt F. Betti Ia. Bezshyiko S. Bhasin J. Bhom L. Bian M. S. Bieker S. Bifani P. Billoir M. Birch F. C. R. Bishop A. Bitadze A. Bizzeti M. Bjørn M. P. Blago T. Blake F. Blanc S. Blusk D. Bobulska J. A. Boelhauve O. Boente Garcia T. Boettcher A. Boldyrev A. Bondar N. Bondar S. Borghi M. Borisyak M. Borsato J. T. Borsuk S. A. Bouchiba T. J. V. Bowcock A. Boyer C. Bozzi M. J. Bradley S. Braun A. Brea Rodriguez M. Brodski J. Brodzicka A. Brossa Gonzalo D. Brundu A. Buonaura C. Burr A. Bursche A. Butkevich J. S. Butter J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese L. Calefice L. Calero Diaz S. Cali R. Calladine M. Calvi M. Calvo Gomez P. Camargo Magalhaes P. Campana A. F. Campoverde Quezada S. Capelli L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini I. Carli P. Carniti L. Carus K. Carvalho Akiba A. Casais Vidal G. Casse M. Cattaneo G. Cavallero S. Celani J. Cerasoli A. J. Chadwick M. G. Chapman M. Charles Ph. Charpentier G. Chatzikonstantinidis C. A. Chavez Barajas M. Chefdeville C. Chen S. Chen A. Chernov V. Chobanova S. Cholak M. Chrzaszcz A. Chubykin V. Chulikov P. Ciambrone M. F. Cicala X. Cid Vidal G. Ciezarek P. E. L. Clarke M. Clemencic H. V. Cliff J. Closier J. L. Cobbledick V. Coco J. A. B. Coelho J. Cogan E. Cogneras 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 United States associated to Syracuse University Syracuse New York USA INFN Sezione di Milano Milano Italy University of Cincinnati Cincinnati Ohio USA 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 Department of Physics and Astronomy University of Manchester Manchester United Kingdom Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI) Gatchina Russia Cavendish Laboratory University of Cambridge Cambridge 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 INFN Sezione di Ferrara Ferrara Italy Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany 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 Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France Institute of Physics Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland Department of Physics University of Warwick Coventry United Kingdom Centro Brasileiro de P

A search for CP violation in charmless three-body Ξb−→pK−K− decays is performed using pp collision data recorded with the LHCb detector, corresponding to integrated luminosities of 1 fb−1 at a center-of-mass energy s=7 TeV, 2 fb−1 at s=8 TeV and 2 fb−1 at s=13 TeV. A good description of the phase-space distribution is obtained with an amplitude model containing contributions from Σ(1385), Λ(1405), Λ(1520), Λ(1670), Σ(1775) and Σ(1915) resonances. The model allows for CP -violation effects, which are found to be consistent with zero. The branching fractions of Ξb−→Σ(1385)K−, Ξb−→Λ(1405)K−, Ξb−→Λ(1520)K−, Ξb−→Λ(1670)K−, Ξb−→Σ(1775)K− and Ξb−→Σ(1915)K− decays are also reported. In addition, an upper limit is placed on the product of ratios of Ωb− and Ξb− fragmentation fractions and the Ωb−→pK−K− and Ξb−→pK−K− branching fractions.

关键词： Baryons CP violation

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Metastable solitonic states in the strained itinerant helimagnet FeGe

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Physical Review B 2020年第1期102卷 014416-014416页

作者： Victor Ukleev Yuichi Yamasaki Oleg Utesov Kiyou Shibata Naoya Kanazawa Nicolas Jaouen Hironori Nakao Yoshinori Tokura Taka-hisa Arima RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan Laboratory for Neutron Scattering and Imaging (LNS) Paul Scherrer Institute (PSI) CH-5232 Villigen Switzerland Research and Services Division of Materials Data and Integrated System (MaDIS) National Institute for Materials Science (NIMS) Tsukuba 305-0047 Japan PRESTO Japan Science and Technology Agency (JST) Kawaguchi 332-0012 Japan Petersburg Nuclear Physics Institute NRC “Kurchatov Institute ” Gatchina Saint-Petersburg 188300 Russia St. Petersburg State University 7/9 Universitetskaya nab. St. Petersburg 199034 Russia St. Petersburg Academic University–Nanotechnology Research and Education Centre of the Russian Academy of Sciences 194021 St. Petersburg Russia Department of Applied Physics and Quantum-Phase Electronics Center (QPEC) University of Tokyo Tokyo 113-8656 Japan Synchrotron SOLEIL Saint-Aubin Boîte Postale 48 91192 Gif-sur-Yvette Cedex France Condensed Matter Research Center and Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization Tsukuba 305-0801 Japan Department of Applied Physics University of Tokyo Tokyo 113-8656 Japan Tokyo College University of Tokyo Tokyo 113-8656 Japan Department of Advanced Materials Science University of Tokyo Kashiwa 277-8561 Japan

Tensile strain is a promising tool for the creation and manipulation of magnetic solitonic textures in chiral helimagnets via tunable control of magnetic anisotropy and Dzyaloshinskii-Moriya interaction. Here, by using in situ resonant small-angle x-ray scattering, we demonstrate that skyrmion and chiral soliton lattices can be achieved as metastable states in FeGe lamella as distinct states under tensile strain and magnetic fields in various orientations with respect to the deformation. The small-angle scattering data can be well accounted for in the framework of the analytical model for a soliton lattice. By using the experimental results and analytical theory, the unwinding of metastable skyrmions in a perpendicular magnetic field as shown by a small-angle scattering experiment was analyzed via micromagnetic simulation.

关键词： Helicoidal magnetic texture Skyrmions Symmetry protected topological states Helimagnets Nanostructures Micromagnetic modeling Resonant elastic x-ray scattering Small-angle x-ray scattering Solitons X-ray resonant magnetic scattering

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Snowmass 2021 White Paper: Electron Ion Collider for High Energy Physics

arXiv

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arXiv 2022年

作者： Abdul Khalek, R. D'Alesio, U. Arratia, Miguel Bacchetta, A. Battaglieri, M. Begel, M. Boglione, M. Boughezal, R. Boussarie, R. Bozzi, G. Chekanov, S.V. Celiberto, F.G. Chirilli, G. Cridge, T. Cruz-Torres, R. Corliss, R. Cotton, C. Davoudiasl, H. Denton, Peter B. Deshpande, A. Dong, Xin Emmert, A. Fazio, S. Forte, S. Furletova, Yulia Gal, Ciprian Gwenlan, Claire Guzey, V. Harland-Lang, L.A. Helenius, I. Hentschinski, M. Hobbs, Timothy J. Höche, S. Hou, T.-J. Ji, Y. Jing, X. Kelsey, M. Klasen, M. Kang, Zhong-Bo Kovchegov, Y.V. Kumar, K.S. Lappi, Tuomas Lee, K. Lee, Yen-Jie Li, H.-T. Li, X. Lin, H.-W. Liu, H. Liu, Z.L. Liuti, S. Lorcé, C. Lunghi, E. Marcarelli, R. Magill, S. Makris, Y. Mantry, S. Melnitchouk, W. Mezrag, C. Moch, S. Moutarde, H. Mukherjee, Swagato Murgia, F. Nachman, B. Nadolsky, P.M. Nam, J.D. Neill, D. Neil, E.T. Nocera, E. Nycz, M. Olness, F. Petriello, F. Pitonyak, D. Plätzer, S. Prestel, Stefan Prokudin, Alexei Qiu, J. Radici, M. Radhakrishnan, S. Sadofyev, A. Rojo, J. Ringer, F. Salazar, Farid Sato, N. Schenke, Björn Schlichting, Sören Schweitzer, P. Sekula, S.J. Shao, D.Y. Sherrill, N. Sichtermann, E. Signori, A. Şimşek, K. Simonelli, A. Sznajder, P. Szymanowski, L. Tezgin, K. Thorne, R.S. Tricoli, A. Venugopalan, R. Vladimirov, A. Vicini, Alessandro Vitev, Ivan Wallon, S. Wiegand, D. Wong, C.-P. Xie, K. Zaccheddu, M. Zhao, Y. Zhang, J. Zheng, X. Zurita, P. Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States Dipartimento di Fisica Università di Cagliari Cittadella Universitaria CA MonserratoI-09042 Italy INFN Sezione di Cagliari Cittadella Universitaria CA MonserratoI-09042 Italy Department of Physics and Astronomy University of California RiversideCA92521 United States Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States Dipartimento di Fisica Universià di Pavia INFN-Sezione Pavia PaviaI-27100 Italy INFN Sezione di Genova Genova16146 Italy Physics Department Brookhaven National Laboratory UptonNY11973 United States Dipartimento di Fisica Università di Torino INFN-Sezione Torino Italy High Energy Physics Division Argonne National Laboratory ArgonneIL60439 United States CPHT CNRS Ecole Polytechnique Institut Polytechnique de Paris Palaiseau91128 France Dipartimento di Fisica Universit'a di Cagliari Cittadella Universitaria CA MonserratoI-09042 Italy Villazzano TrentoI-38123 Italy Povo TrentoI-38123 Italy INFN-TIFPA Trento Institute of Fundamental Physics and Applications Povo TrentoI-38123 Italy Institute for Theoretical Physics University of Regensburg Universitätsstrasse 31 RegensburgD-93040 Germany Department of Physics and Astronomy University College London LondonWC1E 6BT United Kingdom Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics and Astronomy Stony Brook University Stony BrookNY11794 United States Center for Frontiers in Nuclear Science Stony Brook University Stony BrookNY11794 United States University of Virginia CharlottesvilleVA22904 United States High Energy Theory Group Physics Department Brookhaven National Laboratory UptonNY11973 United States Dipartimento di Fisica Università degli Studi di Milano INFN Sezione di Milano MilanoI-20133 Italy Mississippi State University Mississippi StateMS39762 United States Oxford University OxfordOX1 3P

Electron Ion Collider (EIC) is a particle accelerator facility planned for construction at Brookhaven National laboratory on Long Island, New York by the United States Department of Energy. EIC will provide capabilities of colliding beams of polarized electrons with polarized beams of proton and light ions. EIC will be one of the largest and most sophisticated new accelerator facilities worldwide, and the only new large-scale accelerator facility planned for construction in the United States in the next few decades. The versatility, resolving power and intensity of EIC will present many new opportunities to address some of the crucial and fundamental open scientific questions in particle physics. This document provides an overview of the science case of EIC from the perspective of the high energy physics community. Copyright © 2022, The Authors. All rights reserved.

关键词： Ions

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The excitation functions of ^(187)Re(n,2n)^(186m,g)Re reactions

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Chinese Physics C 2016年第8期40卷 55-61页

作者：黄小龙康梦霄刘丽乐王记民陈雄军 Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy

A new value for the emission probability of 137.144 keV γ-rays from 186gRe decay is recommended to be （9.47±0.03）/%. Using this value the measured cross sections for 187Re（n,2n）186mRe and 187Re（n,2n）186gRe reactions around 14 MeV are analyzed, and the cross section for187Ke（n,2n）186m＋gRe reaction at 14.g MeV is （2213=k116） mb. The UNF code was adopted to calculate the cross sections for the 187Re（n,2n）186m＋gRe reaction below 20 MeV, fitting to the value （2213±116） mb at 14.8 MeV using a set of optimum neutron optical potential parameters which were obtained based on the relevant experimental data of rhenium. The isomeric cross section ratio for the 187Re（n,2n）186m,gRe reaction was analyzed using the V-H method based on nuclear statistical theory. Combining these calculated results, the excitation functions for the 187Re（n,2n）lS6mRe and 187Re（n,2n）186gRe reactions were obtained. The obtained results are in good agreement with the available experimental data.

关键词： excitation function isomeric cross section 187Re（n,2n）186m,gRe reaction

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Angular analysis of B0 → D∗−Ds∗+ with Ds∗+ → Ds+γ decays

arXiv

引用

arXiv 2021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 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. 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. 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. 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. Buonaura, A. Burr, C. Bursche, A. Butkevich, A. Butter, J.S. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calefice, L. Diaz, L. Calero Cali, S. Calladine, R. Calvi, M. Gomez, M. Calvo Magalhaes, P. Camargo Camboni, A. Campana, P. Quezada, A.F. Campoverde Capelli, S. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carli, I. Carniti, P. Carus, L. Akiba, K. Carvalho Vidal, A. Casais Casse, G. Cattaneo, M. Cavallero, G. Celani, S. Cerasoli, J. Chadwick, A.J. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Barajas, C.A. Chavez Chefdeville, M. Chen, C. Chen, S. 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 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 Physic

The first full angular analysis of the B0 → D∗−Ds∗+ decay is performed using 6 fb−1 of pp collision data collected with the LHCb experiment at a centreof-mass energy of 13 TeV. The Ds∗+ → Ds+ γ and D∗− → D0π− vector meson decays are used with the subsequent Ds+ → K+K−π+ and D0 → K+π− decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be fL = 0.578 ± 0.010 ± 0.011 with world-best precision, where the first uncertainty is statistical and the second is systematic. The pattern of helicity amplitude magnitudes is found to align with expectations from quark-helicity conservation in B decays. The ratio of branching fractions [B(B0 → D∗−Ds∗+) × B(Ds∗+ → Ds+ γ)]/B(B0 → D∗−Ds+) is measured to be 2.045 ± 0.022 ± 0.071 with world-best precision. In addition, the first observation of the Cabibbo-suppressed Bs0 → D∗−Ds+ decay is made with a significance of seven standard deviations. The branching fraction ratio B(Bs0 → D∗−Ds+)/B(B0 → D∗−Ds+) is measured to be 0.049 ± 0.006 ± 0.003 ± 0.002, where the third uncertainty is due to limited knowledge of the ratio of fragmentation fractions. © 2021, CC BY.

关键词： Hadrons

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Evaluation of planar silicon pixel sensors with the RD53A readout chip for the Phase-2 Upgrade of the CMS Inner Tracker

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Journal of Instrumentation 2023年第11期18卷 P11015页

作者： Adam, W. Bergauer, T. Damanakis, K. Dragicevic, M. Frühwirth, R. Steininger, H. Beaumont, W. Darwish, M.R. Janssen, T. Rejeb Sfar, H. Van Mechelen, P. Breugelmans, N. Delcourt, M. De Moor, A. D’Hondt, J. Heyen, F. Lowette, S. Makarenko, I. Muller, D. Sahasransu, A.R. Vannerom, D. Van Putte, S. Allard, Y. Clerbaux, B. Dansana, S. De Lentdecker, G. Evard, H. Favart, L. Hohov, D. Khalilzadeh, A. Lee, K. Mahdavikhorrami, M. Malara, A. Paredes, S. Postiau, N. Robert, F. Thomas, L. Vanden Bemden, M. Vanlaer, P. Yang, Y. Benecke, A. Bruno, G. Bury, F. Caputo, C. De Favereau, J. Delaere, C. Donertas, I.S. Giammanco, A. Jaffel, K. Jain, S. Lemaitre, V. Mondal, K. Szilasi, N. Tran, T.T. Wertz, S. Brigljević, V. Chitroda, B. Ferenček, D. Mishra, S. Starodumov, A. Šuša, T. Brücken, E. Lampén, T. Martikainen, L. Tuominen, E. Karadzhinova-Ferrer, A. Luukka, P. Petrow, H. Tuuva, T. Agram, J.-L. Andrea, J. Apparu, D. Bloch, D. Bonnin, C. Brom, J.-M. Chabert, E. Charles, L. Collard, C. Dangelser, E. Falke, S. Goerlach, U. Gross, L. Haas, C. Krauth, M. Ollivier-Henry, N. Baulieu, G. Bonnevaux, A. Boudoul, G. Caponetto, L. Chanon, N. Contardo, D. Dupasquier, T. Galbit, G. Marchisone, M. Mirabito, L. Nodari, B. Schibler, E. Schirra, F. Vander Donckt, M. Viret, S. Botta, V. Ebisch, C. Feld, L. Karpinski, W. Klein, K. Lipinski, M. Louis, D. Meuser, D. Özen, I. Pauls, A. Pierschel, G. Röwert, N. Teroerde, M. Wlochal, M. Dziwok, C. Fluegge, G. Pooth, O. Stahl, A. Ziemons, T. Agah, A. Bhattacharya, S. Blekman, F. Campbell, A. Cardini, A. Cheng, C. Consuegra Rodriguez, S. Eckerlin, G. Eckstein, D. Gallo, E. Guthoff, M. Kleinwort, C. Mankel, R. Maser, H. Muhl, C. Mussgiller, A. Nürnberg, A. Otarid, Y. Perez Adan, D. Petersen, H. Pitzl, D. Rastorguev, D. Reichelt, O. Schütze, P. Sreelatha Pramod, L. Stever, R. Velyka, A. Ventura Barroso, A. Walsh, R. Zuber, A. Albrecht, A. Antonello, M. Biskop, H. Buhmann, P. Connor, P. Feindt, F. Garutti, E. Institut für Hochenergiephysik Wien Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Institut Ruđer Bošković Zagreb Croatia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta-Lahti University of Technology Lappeenranta Finland Université de Strasbourg CNRS IPHC UMR 7178 Strasbourg France Université de Lyon Université Claude Bernard Lyon 1 CNRS IN2P3 IP2I Lyon UMR 5822 Villeurbanne France RWTH Aachen University I. Physikalisches Institut Aachen Germany RWTH Aachen University III. Physikalisches Institut B Aachen Germany Deutsches Elektronen-Synchrotron Hamburg Germany University of Hamburg Hamburg Germany Institut für Experimentelle Teilchenphysik KIT Karlsruhe Germany NCSR Demokritos Aghia Paraskevi Greece Wigner Research Centre for Physics Budapest Hungary National Institute of Science Education and Research HBNI Bhubaneswar India University of Delhi Delhi India Saha Institute of Nuclear Physics HBNI Kolkata India Indian Institute of Technology Madras Madras India INFN Sezione di Bari Bari Italy Università di Bari Bari Italy Politecnico di Bari Bari Italy INFN Sezione di Catania Catania Italy Università di Catania Catania Italy INFN Sezione di Firenze Firenze Italy Università di Firenze Firenze Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano-Bicocca Milano Italy Università di Milano-Bicocca Milano Italy INFN Sezione di Padova Padova Italy Università di Padova Padova Italy INFN Sezione di Pavia Pavia Italy Università di Bergamo Pavia Italy Bergamo Università di Pavia Pavia Italy INFN Sezione di Perugia Perugia Italy Università di Perugia Perugia Italy CNR-IOM Perugia Perugia Italy INFN Sezione di Pisa Siena Italy Università di Pisa Siena Italy Scuola Normale Superiore di Pisa Sien

The Large Hadron Collider at CERN will undergo an upgrade in order to increase its luminosity to 7.5 × 1034 cm-2s-1. The increased luminosity during this High-Luminosity running phase, starting around 2029, means a higher rate of proton-proton interactions, hence a larger ionizing dose and particle fluence for the detectors. The current tracking system of the CMS experiment will be fully replaced in order to cope with the new operating conditions. Prototype planar pixel sensors for the CMS Inner Tracker with square 50 μm × 50 μm and rectangular 100 μm × 25 μm pixels read out by the RD53A chip were characterized in the lab and at the DESY-II testbeam facility in order to identify designs that meet the requirements of CMS during the High-Luminosity running phase. A spatial resolution of approximately 3.4 μm (2 μm) is obtained using the modules with 50 μm×50 μm (100 μm × 25 μm) pixels at the optimal angle of incidence before irradiation. After irradiation to a 1MeV neutron equivalent fluence of Φeq = 5.3 × 1015 cm-2, a resolution of 9.4 μm is achieved at a bias voltage of 800V using a module with 50 μm × 50 μm pixel size. All modules retain a hit efficiency in excess of 99% after irradiation to fluences up to 2.1 × 1016 cm-2. Further studies of the electrical properties of the modules, especially crosstalk, are also presented in this paper. © 2023 Institute of Physics Publishing. All rights reserved.

关键词： Pixels

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