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Observation and measurements of the production of prompt and non-prompt J/psi mesons in association with a Z boson in pp collisions at root s=8 TeV with the ATLAS detector
ATLAS Collaboration
2015
发表期刊EUROPEAN PHYSICAL JOURNAL C
卷号75期号:5页码:229
文章类型Article
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.
学科领域Physics
DOI10.1140/epjc/s10052-015-3406-9
收录类别SCI
WOS类目Physics, Particles & Fields
WOS记录号WOS:000355680900005
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228441
专题实验物理中心
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ATLAS Collaboration. Observation and measurements of the production of prompt and non-prompt J/psi mesons in association with a Z boson in pp collisions at root s=8 TeV with the ATLAS detector[J]. EUROPEAN PHYSICAL JOURNAL C,2015,75(5):229.
APA ATLAS Collaboration.(2015).Observation and measurements of the production of prompt and non-prompt J/psi mesons in association with a Z boson in pp collisions at root s=8 TeV with the ATLAS detector.EUROPEAN PHYSICAL JOURNAL C,75(5),229.
MLA ATLAS Collaboration."Observation and measurements of the production of prompt and non-prompt J/psi mesons in association with a Z boson in pp collisions at root s=8 TeV with the ATLAS detector".EUROPEAN PHYSICAL JOURNAL C 75.5(2015):229.
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