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https://hdl.handle.net/20.500.11851/9665
Title: | 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 | Authors: | Aad, G. Abbott, B. Abdallah, J. Khalek, S. Abdel Abdinov, O. Aben, R. Adelman, J. |
Keywords: | J-Psi Quarkonium Qcd Photoproduction Scattering Upsilon Decays |
Publisher: | Springer | Abstract: | 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. | URI: | https://doi.org/10.1140/epjc/s10052-015-3406-9 https://hdl.handle.net/20.500.11851/9665 |
ISSN: | 1434-6044 1434-6052 |
Appears in Collections: | PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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