Measurement of the Λb0 lifetime and mass in the ATLAS experiment

被引：24

作者：

Aad, G. ^{[70
,122
]}

Abajyan, T. ^{[31
]}

Abbott, B. ^{[148
]}

Abdallah, J. ^{[15
,16
,17
]}

Khalek, S. Abdel ^{[152
,153
]}

Abdelalim, A. A. ^{[71
]}

Abdinov, O. ^{[14
]}

Aben, R. ^{[141
,142
]}

Abi, B. ^{[149
]}

Abolins, M. ^{[122
]}

AbouZeid, O. S. ^{[213
]}

Abramowicz, H. ^{[207
]}

Abreu, H. ^{[186
]}

Acerbi, E. ^{[123
]}

Acharya, B. S. ^{[220
,221
]}

Adamczyk, L. ^{[59
]}

Adams, D. L. ^{[38
]}

Addy, T. N. ^{[82
]}

Adelman, J. ^{[238
]}

Adomeit, S. ^{[132
]}

Adragna, P. ^{[106
]}

Adye, T. ^{[171
]}

Aefsky, S. ^{[33
]}

Aguilar-Saavedra, J. A. ^{[164
,165
,166
]}

Agustoni, M. ^{[23
,24
]}

Aharrouche, M. ^{[114
]}

Ahlen, S. P. ^{[32
]}

Ahles, F. ^{[70
]}

Ahmad, A. ^{[31
,120
,201
,202
]}

Ahsan, M. ^{[62
]}

Aielli, G. ^{[176
,177
]}

Akdogan, T. ^{[26
]}

Akesson, T. P. A. ^{[112
]}

Akimoto, G. ^{[209
,210
]}

Akimov, A. V. ^{[128
]}

Alam, M. S. ^{[1
]}

Alam, M. A. ^{[107
]}

Albert, J. ^{[231
]}

Albrand, S. ^{[79
,80
,81
]}

Aleksa, M. ^{[44
]}

Aleksandrov, I. N. ^{[92
]}

Alessandria, F.

Alexa, C. ^{[39
]}

Alexander, G. ^{[207
]}

Alexandre, G. ^{[71
]}

Alexopoulos, T. ^{[13
]}

Alhroob, M. ^{[220
,222
]}

Aliev, M. ^{[22
]}

Alimonti, G.

Alison, J. ^{[159
]}

机构：

[1] SUNY Albany, Dept Phys, Albany, NY 12222 USA

[2] Univ Alberta, Dept Phys, Edmonton, AB, Canada

[3] Ankara Univ, Dept Phys, TR-06100 Ankara, Turkey

[4] Gazi Univ, Dept Phys, Ankara, Turkey

[5] TOBB Univ Econ & Technol, Div Phys, Ankara, Turkey

[6] Turkish Atom Energy Commiss, Ankara, Turkey

[7] CNRS, IN2P3, LAPP, Annecy Le Vieux, France

[8] Univ Savoie, Annecy Le Vieux, France

[9] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA

[10] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

[11] Univ Texas Arlington, Dept Phys, Arlington, TX 76019 USA

[12] Univ Athens, Dept Phys, Athens, Greece

[13] Natl Tech Univ Athens, Dept Phys, Zografos, Greece

[14] Azerbaijan Acad Sci, Inst Phys, Baku 370143, Azerbaijan

[15] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain

[16] Univ Autonoma Barcelona, Dept Fis, E-08193 Barcelona, Spain

[17] ICREA, Barcelona, Spain

[18] Univ Belgrade, Inst Phys, Belgrade, Serbia

[19] Univ Belgrade, Vinca Inst Nucl Sci, Belgrade, Serbia

[20] Univ Bergen, Dept Phys & Technol, Bergen, Norway

[21] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA

[22] Humboldt Univ, Dept Phys, Berlin, Germany

[23] Univ Bern, Albert Einstein Ctr Fundamental Phys, Bern, Switzerland

[24] Univ Bern, High Energy Phys Lab, Bern, Switzerland

[25] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England

[26] Bogazici Univ, Dept Phys, Istanbul, Turkey

[27] Dogus Univ, Div Phys, Istanbul, Turkey

[28] Gaziantep Univ, Dept Engn Phys, Gaziantep, Turkey

[29] Ist Nazl Fis Nucl, Sez Bologna, Milan, Italy

[30] Univ Bologna, Dipartmento Fis, Bologna, Italy

[31] Univ Bonn, Inst Phys, Bonn, Germany

[32] Boston Univ, Dept Phys, Boston, MA 02215 USA

[33] Brandeis Univ, Dept Phys, Waltham, MA 02254 USA

[34] Univ Fed Rio de Janeiro COPPE EE IF, Rio De Janeiro, Brazil

[35] Fed Univ Juiz de Fora UFJF, Juiz De Fora, Brazil

[36] Fed Univ Sao Joao del Rei UFSJ, Sao Joao Del Rei, Brazil

[37] Univ Sao Paulo, Inst Fis, BR-01498 Sao Paulo, Brazil

[38] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[39] Natl Inst Phys & Nucl Engn, Bucharest, Romania

[40] Univ Politehn Bucuresti, Bucharest, Romania

[41] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, RA-1428 Buenos Aires, DF, Argentina

[42] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[43] Carleton Univ, Dept Phys, Ottawa, ON K1S 5B6, Canada

[44] CERN, Geneva, Switzerland

[45] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[46] Pontificia Univ Catolica Chile, Dept Fis, Santiago, Chile

[47] Univ Tecn Federico Santa Maria, Dept Fis, Valparaiso, Chile

[48] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China

[49] Univ Sci & Technol China, Dept Modern Phys, Hefei, Anhui, Peoples R China

[50] Nanjing Univ, Dept Phys, Nanjing, Jiangsu, Peoples R China

来源：

PHYSICAL REVIEW D | 2013年 / 87卷 / 03期

基金：

巴西圣保罗研究基金会; 加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.87.032002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A measurement of the Lambda(0)(b) lifetime and mass in the decay channel Lambda(0)(b) -> J/psi (mu(+) mu(-))Lambda(0)(p pi(-)) is presented. The analysis uses a signal sample of about 2200 Lambda(0)(b) and (Lambda) over bar (0)(b) decays that are reconstructed in 4.9 fb(-1) of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Lambda(0)(b) lifetime and mass. They are measured to be tau(Lambda b) = 1.449 +/- 0.036(stat) +/- 0.017(syst) ps and m(Lambda b) = 5619.7 +/- 0.7(stat) +/- 1.1(syst) MeV. DOI: 10.1103/PhysRevD.87.032002

引用

页数：19

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