Measurement of the prompt J/ψ pair production cross-section in pp collisions at √ s = 8 TeV with the ATLAS detector

Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Abeloos, B.; Aben, R.; AbouZeid, O.; Abraham, N.; Abramowicz, H.; Abreu, H.; Abreu, R.; Abulaiti, Y.; Acharya, B.; Adachi, S.; Adamczyk, L.; Adams, D.; Adelman, J.; Adomeit, S.; Adye, T.; et al.

Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/115053

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Type:	Journal article
Title:	Measurement of the prompt J/ψ pair production cross-section in pp collisions at √ s = 8 TeV with the ATLAS detector
Other Titles:	Measurement of the prompt J/psi pair production cross-section in pp collisions at root s = 8 TeV with the ATLAS detector
Author:	Aaboud, M. Aad, G. Abbott, B. Abdallah, J. Abdinov, O. Abeloos, B. Aben, R. AbouZeid, O. Abraham, N. Abramowicz, H. Abreu, H. Abreu, R. Abulaiti, Y. Acharya, B. Adachi, S. Adamczyk, L. Adams, D. Adelman, J. Adomeit, S. Adye, T. et al.
Citation:	European Physical Journal C: Particles and Fields, 2017; 77(2):1-34
Publisher:	Springer
Issue Date:	2017
ISSN:	1434-6044 1434-6052
Statement of Responsibility:	M. Aaboud ...P. Jackson ... L. Lee ... A. Petridis ... M.J. White ... [et al.] (The ATLAS Collaboration)
Abstract:	The production of two prompt J/ψ mesons, each with transverse momenta pT>8.5 GeV and rapidity \|y\|<2.1, is studied using a sample of proton-proton collisions at s√ = 8 TeV, corresponding to an integrated luminosity of 11.4 fb⁻¹ collected in 2012 with the ATLAS detector at the LHC. The differential cross-section, assuming unpolarised J/ψ production, is measured as a function of the transverse momentum of the lower-pT J/ψ meson, di-J/ψ pT and mass, the difference in rapidity between the two J/ψ mesons, and the azimuthal angle between the two J/ψ mesons. The fraction of prompt pair events due to double parton scattering is determined by studying kinematic correlations between the two J/ψ mesons. The total and double parton scattering cross-sections are compared with predictions. The effective cross-section of double parton scattering is measured to be σeff=6.3±1.6(stat)±1.0(syst) mb.
Keywords:	ATLAS Collaboration
Rights:	© CERN for the benefit of the ATLAS collaboration 2017. This article is published with open access at Springerlink.com. Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecomm ons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3.
DOI:	10.1140/epjc/s10052-017-4644-9
Grant ID:	ARC
Published version:	http://dx.doi.org/10.1140/epjc/s10052-017-4644-9
Appears in Collections:	Aurora harvest 8 Physics publications

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