Measurement of the mass difference and relative production rate of the Ωb- and Ξb- baryons

被引:2
作者
Aaij, R. [32 ]
Abdelmotteleb, A. S. W. [50 ]
Beteta, C. Abellan [44 ]
Abudinen, F. [50 ]
Ackernley, T. [54 ]
Adeva, B. [40 ]
Adinolfi, M. [48 ]
Adlarson, P. [74 ]
Afsharnia, H. [9 ]
Agapopoulou, C. [13 ]
Aidala, C. A. [75 ]
Ajaltouni, Z. [9 ]
Akar, S. [59 ]
Akiba, K. [32 ]
Albicocco, P. [23 ]
Albrecht, J. [15 ]
Alessio, F. [42 ]
Alexander, M. [53 ]
Albero, A. Alfonso [39 ]
Aliouche, Z. [56 ]
Cartelle, P. Alvarez [49 ]
Amalric, R. [13 ]
Amato, S. [2 ]
Amey, J. L. [48 ]
Amhis, Y. [11 ,42 ]
An, L. [42 ]
Anderlini, L. [22 ]
Andersson, M. [44 ]
Andreianov, A. [37 ]
Andreotti, M. [21 ]
Andreou, D. [62 ]
Ao, D. [6 ,89 ]
Archilli, F. [31 ,76 ]
Artamonov, A. [37 ]
Artuso, M. [62 ]
Aslanides, E. [10 ]
Atzeni, M. [44 ]
Audurier, B. [12 ]
Perea, I. Bachiller [8 ]
Bachmann, S. [17 ]
Bachmayer, M. [43 ]
Back, J. J. [50 ]
Rodriguez, P. Baladron [40 ]
Balagura, V. [12 ]
Baldini, W. [21 ,42 ]
Leite, J. Baptista de Souza [1 ]
Barbetti, M. [22 ,77 ]
Barlow, R. J. [56 ]
Barsuk, S. [11 ]
Barter, W. [52 ]
机构
[1] Ctr Brasileiro Pesquisas Fis CBPF, Rio De Janeiro, Brazil
[2] Univ Fed Rio De Janeiro UFRJ, Rio De Janeiro, Brazil
[3] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China
[4] Inst High Energy Phys IHEP, Beijing, Peoples R China
[5] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing, Peoples R China
[6] Univ Chinese Acad Sci, Beijing, Peoples R China
[7] Cent China Normal Univ, Inst Particle Phys, Wuhan, Hubei, Peoples R China
[8] Univ Savoie Mont Blanc, CNRS, IN2P3 LAPP, Annecy, France
[9] Univ Clermont Auvergne, LPC, CNRS IN2P3, Clermont Ferrand, France
[10] Aix Marseille Univ, CPPM, CNRS IN2P3, Marseille, France
[11] Univ Paris Saclay, CNRS IN2P3, IJCLab, Orsay, France
[12] Inst Polytech Paris, Lab Leprince Ringuet, Ecole Polytech, CNRS IN2P3, Palaiseau, France
[13] Sorbonne Univ, LPNHE, Paris Diderot Sorbonne Paris Cite, CNRS IN2P3, Paris, France
[14] Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany
[15] Tech Univ Dortmund, Fak Phys, Dortmund, Germany
[16] Max Planck Inst Kernphys MPIK, Heidelberg, Germany
[17] Heidelberg Univ, Phys Inst, Heidelberg, Germany
[18] Univ Coll Dublin, Sch Phys, Dublin, Ireland
[19] INFN Sez Bari, Bari, Italy
[20] INFN Sez Bologna, Bologna, Italy
[21] INFN Sez Ferrara, Ferrara, Italy
[22] INFN Sez Firenze, Florence, Italy
[23] INFN Lab Nazl Frascati, Frascati, Italy
[24] INFN Sez Genova, Genoa, Italy
[25] INFN Sez Milano, Milan, Italy
[26] INFN Sez Milano Bicocca, Milan, Italy
[27] INFN Sez Cagliari, Monserrato, Italy
[28] Univ Padua, Univ, Padua, Italy
[29] INFN, Padua, Italy
[30] INFN Sez Pisa, Pisa, Italy
[31] INFN Sez Roma Tor Vergata, Rome, Italy
[32] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands
[33] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Krakow, Poland
[34] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, Krakow, Poland
[35] Natl Ctr Nucl Res NCBJ, Warsaw, Poland
[36] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania
[37] CERN, Meyrin, Switzerland
[38] Univ Ramon Llull, DS4DS, Barcelona, Spain
[39] Univ Barcelona, ICCUB, Barcelona, Spain
[40] Univ Santiago De Compostela, Inst Galego Fis Altas Enerxias IGFAE, Santiago De Compostela, Spain
[41] Ctr Mixto Univ Valencia CSIC, Inst Fis Corpuscular, Valencia, Spain
[42] European Org Nucl Res CERN, Geneva, Switzerland
[43] Ecole Polytech Fed Lausanne, Inst Phys, Lausanne, Switzerland
[44] Univ Zurich, Phys Inst, Zurich, Switzerland
[45] NSC Kharkiv Inst Phys & Technol NSC KIPT, Kharkiv, Ukraine
[46] Natl Acad Sci KINR, Inst Nucl Res, Kiev, Ukraine
[47] Univ Birmingham, Birmingham, W Midlands, England
[48] Univ Bristol, HH Wills Phys Lab, Bristol, Avon, England
[49] Univ Cambridge, Cavendish Lab, Cambridge, England
[50] Univ Warwick, Dept Phys, Coventry, W Midlands, England
基金
美国国家科学基金会; 欧洲研究理事会; 欧盟地平线“2020”; 中国国家自然科学基金; 英国科学技术设施理事会;
关键词
D O I
10.1103/PhysRevD.108.052008
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The mass difference between the Omega -b and Xi -b baryons is measured using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb-1, and is found to be mo Omega -bthorn - mo Xi -bthorn 1/4 248.54? 0.51ostatthorn ? 0.38osystthorn MeV=c2. The mass of the Omega -b baryon is measured to be mo Omega -bthorn 1/4 6045.9 ? 0.5ostatthorn ? 0.6osystthorn MeV=c2. This is the most precise determination of the Omega -b mass to date. In addition, the production rate of Omega -b baryons relative to that of Xi -b baryons is measured for the first time in pp collisions, using an LHCb dataset collected at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 6 fb-1. Reconstructing beauty baryons in the kinematic region 2 < <eta> < 6 and pT < 20 GeV=c with their decays to a J=psi meson and a hyperon, the ratio f Omega- b f Xi- b tation fractions of b quarks into Omega -b and Xi -b baryons, respectively, and B represents the branching fractions of their respective decays. Bo Omega- b -> J=psi Omega -thorn x Bo Xi- b -> J=psi Xi -thorn 1/4 0.120 ? 0.008ostatthorn ? 0.008osystthorn, is obtained, where f Omega- b and f Xi -b are the fragmen-
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