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

doi:10.1140/epjc/s10052-015-3406-9

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Observation and measurements of the production of prompt and non-prompt Jψ mesons in association with a Z boson in pp collisions at √s = 8 TeV with the ATLAS detector	2 MB	Adobe Acrobat PDF	View Details	Download
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Title: 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
Creator: Aad, G.
Creator: Abdallah, J.
Creator: Chelkov, G. A.
Creator: Abbott, B.
Contributor: Томский государственный университет Радиофизический факультет Научные подразделения РФФ
Subject: ATLAS, детектор
Большой адронный коллайдер
столкновение частиц
бозоны
Date: 2015
DOI: 10.1140/epjc/s10052-015-3406-9
Description: The production of a Z boson in association with a J/ψ meson in proton–proton collisions probes the productionmechanisms 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 the ATLAS experiment at the LHC in pp collisions at √s = 8 TeV, 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 inμ+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 J/ψ 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.

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collection(s): Радиофизический факультет
Identifier: vtls:000525477
http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000525477
Type: статьи в журналах
Source: The European physical journal C. 2015. Vol. 75, № 5. P. 229 (1-29)
Language: eng

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Радиофизический факультет 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