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Title

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

CollaborationWith : Alexandre, Gauthier / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Muenstermann, Daniel / Nektarijevic, Snezana / Nikolics, Katalin / Pásztor, G. / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Wu, Xin
Published in Journal of High Energy Physics. 2014, vol. 1404, p. 172-209
Collection SCOAP3
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 ± → μν μ and J / ψ → μ + μ − . A yield of $ 27.4_{-6.5}^{+7.5 } $ 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.
Keywords Hadron-Hadron Scattering
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arXiv: 1401.2831
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ATLAS COLLABORATION. 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. In: Journal of High Energy Physics, 2014, vol. 1404, p. 172-209. https://archive-ouverte.unige.ch/unige:55805

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Deposited on : 2015-04-27

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