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

, The ATLAS collaboration (2015) Observation and measurements of the production of prompt and non-prompt Jψ Jψ mesons in association with a Z Z boson in pp pp collisions at s √ =8TeV s √ =8TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, 75 (5). ISSN 1434-6044

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Abstract

The production of a Z boson in association with a J/ψ 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 20.3fb −1 of data collected with the ATLAS experiment at the LHC in pp collisions at s √ =8TeV , the first measurement of associated Z+J/ψ production is presented for both prompt and non-prompt J/ψ production, with both signatures having a significance in excess of 5σ . The inclusive production cross-sections for Z boson production (analysed in μ + μ − or e + e − decay modes) in association with prompt and non-prompt J/ψ(→μ + μ − ) are measured relative to the inclusive production rate of Z bosons in the same fiducial volume to be (36.8±6.7±2.5)×10 −7 and (65.8±9.2±4.2)×10 −7 respectively. Normalised differential production cross-section ratios are also determined as a function of the Jψ 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.

Item Type:
Journal Article
Journal or Publication Title:
European Physical Journal C: Particles and Fields
Additional Information:
© CERN for the benefit of the ATLAS collaboration 2015. This article is published with open access at Springerlink.com EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
ID Code:
75469
Deposited By:
Deposited On:
09 Sep 2015 06:34
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Dec 2020 02:52