Observation and measurements of the production of prompt and non-prompt J/ψ mesons in association with a Z boson in pp collisions at √s=8 TeV with the ATLAS detector

被引：64

作者：

Aad, G. ^{[118
,119
]}

Abbott, B. ^{[151
]}

Abdallah, J. ^{[212
]}

Khalek, S. Abdel ^{[155
,156
]}

Abdinov, O. ^{[14
]}

Aben, R. ^{[144
,145
]}

Abi, B. ^{[152
]}

Abolins, M. ^{[124
]}

AbouZeid, O. S. ^{[220
]}

Abramowicz, H. ^{[214
]}

Abreu, H. ^{[213
]}

Abreu, R. ^{[43
]}

Abulaiti, Y. ^{[205
,206
]}

Acharya, B. S. ^{[227
,228
,248
]}

Adamczyk, L. ^{[60
]}

Adams, D. L. ^{[37
]}

Adelman, J. ^{[146
]}

Adomeit, S. ^{[135
]}

Adye, T. ^{[178
]}

Agatonovic-Jovin, T. ^{[17
]}

Aguilar-Saavedra, J. A. ^{[167
,172
,173
]}

Agustoni, M. ^{[22
,23
]}

Ahlen, S. P. ^{[31
]}

Ahmadov, F. ^{[94
,249
]}

Aielli, G. ^{[182
,183
]}

Akerstedt, H. ^{[205
,206
]}

Akesson, T. P. A. ^{[114
]}

Akimoto, G. ^{[216
,217
]}

Akimov, A. V. ^{[131
]}

Alberghi, G. L. ^{[28
,29
]}

Albert, J. ^{[238
]}

Albrand, S. ^{[81
]}

Alconada Verzini, M. J. ^{[100
,101
]}

Aleksa, M. ^{[43
]}

Aleksandrov, I. N. ^{[94
]}

Alexa, C. ^{[38
]}

Alexander, G. ^{[214
]}

Alexandre, G. ^{[73
]}

Alexopoulos, T. ^{[13
]}

Alhroob, M. ^{[151
]}

Alimonti, G. ^{[125
]}

Alio, L. ^{[118
,119
]}

Alison, J. ^{[44
]}

Allbrooke, B. M. M. ^{[24
]}

Allison, L. J. ^{[102
]}

Allport, P. P. ^{[105
]}

Aloisio, A. ^{[140
,141
]}

Alonso, A. ^{[57
]}

Alonso, F. ^{[100
,101
]}

Alpigiani, C. ^{[108
]}

机构：

[1] Univ Adelaide, Dept Phys, Adelaide, SA, Australia

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

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

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

[5] Istanbul Aydin Univ, Istanbul, Turkey

[6] TOBB Univ Econ & Technol, Div Phys, 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] Univ Belgrade, Inst Phys, Belgrade, Serbia

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

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

[20] Univ Calif Berkeley, Berkeley, CA 94720 USA

[21] Humboldt Univ, Dept Phys, D-10099 Berlin, Germany

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

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

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

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

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

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

[28] INFN Sez Bologna, Bologna, Italy

[29] Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy

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

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

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

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

[34] Fed Univ Juiz de Fora UFJF, Elect Circuits Dept, Juiz De Fora, Brazil

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

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

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

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

[39] Natl Inst Res & Dev Isotop & Mol Technol, Dept Phys, Cluj Napoca, Romania

[40] Univ Buenos Aires, Dept Fis, Buenos Aires, DF, Argentina

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

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

[43] CERN, Geneva, Switzerland

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

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

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

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

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

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

[50] Shandong Univ, Sch Phys, Jinan, Shandong, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL C | 2015年 / 75卷 / 05期

基金：

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

关键词：

J-PSI; QUARKONIUM; QCD; PHOTOPRODUCTION; SCATTERING; UPSILON; DECAYS;

D O I：

10.1140/epjc/s10052-015-3406-9

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The production of a Z boson in association with a J/psi meson in proton-proton collisions probes the production mechanisms of quarkonium and heavy flavour in association with vector bosons, and allows studies of multiple parton scattering. Using 20.3 fb(-1) of data collected with theATLAS experiment at the LHC in pp collisions at root s = 8 TeV, the first measurement of associated Z + J/psi production is presented for both prompt and non-prompt J/psi production, with both signatures having a significance in excess of 5 sigma. The inclusive production cross-sections for Z boson production (analysed in mu(+) mu(-) or e(+) e(-) decay modes) in association with prompt and non-prompt J/psi (-> mu(+) mu(-)) are measured relative to the inclusive production rate of Z bosons in the same fiducial volume to be (36.8 +/- 6.7 +/- 2.5) x 10(-7) and (65.8 +/- 9.2 +/- 4.2) x 10(-7) respectively. Normalised differential production cross-section ratios are also determined as a function of the J/psi transverse momentum. The fraction of signal events arising from single and double parton scattering is estimated, and a lower limit of 5.3 (3.7) mb at 68 (95)% confidence level is placed on the effective cross-section regulating double parton interactions.

引用

页码：1 / 29

页数：29

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