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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=8TeV with the ATLAS detector

CollaborationWith : Alexandre, Gauthier / Ancu, Lucian Stefan / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Delitzsch, Chris Malena / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Goulette, Marc / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Tykhonov, Andrii / Vallecorsa, Sofia / Wu, Xin
Published in The European Physical Journal. C, Particles and Fields. 2015, vol. 75, no. 5, p. 229
Collection Open Access - SCOAP3
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.
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ATLAS COLLABORATION. Observation and measurements of the production of prompt and non-prompt Jψ mesons in association with a Z boson in pp collisions at s=8TeV with the ATLAS detector. In: The European Physical Journal. C, Particles and Fields, 2015, vol. 75, n° 5, p. 229. doi: 10.1140/epjc/s10052-015-3406-9 https://archive-ouverte.unige.ch/unige:72941

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Deposited on : 2015-06-02

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