Measurement of the production cross section of prompt J/ ψ mesons in association with a W ± boson in pp collisions at √s = 7 TeV with the ATLAS detector

Aad, G. and Abajyan, T. and Abbott, B. and Abdallah, J. and Abdel, Khalek S. and Abdinov, O. and Aben, R. and Abi, B. and Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Abulaiti, Y. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adye, T. and Aefsky, S. and Agatonovic-Jovin, T. and Aguilar-Saavedra, J. A. and Agustoni, M. and Ahlen, S. P. and Ahmad, A. and Aielli, G. and Åkesson, T. P. A. and Akimoto, G. and Akimov, A. V. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2014) Measurement of the production cross section of prompt J/ ψ mesons in association with a W ± boson in pp collisions at √s = 7 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2014 (4). ISSN 1126-6708

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Abstract

The process pp →W ±J/ ψ provides a powerful probe of the production mechanism of charmonium in hadronic collisions, and is also sensitive to multiple parton interactions in the colliding protons. Using the 2011 ATLAS dataset of 4.5 fb−1 of √s = 7 TeV pp collisions at the LHC, the first observation is made of the production of W ± + prompt J/ ψ events in hadronic collisions, using W ±→ μνμ and J/ψ → μ+ μ−. A yield of 27.4+7.5 −6.5 W ± + prompt J/ ψ events is observed, with a statistical significance of 5.1 σ . The production rate as a ratio to the inclusive W ± boson production rate is measured, and the double parton scattering contribution to the cross section is estimated.

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