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Measurement of χ c 1 and χ c 2 production with √s = 7 TeV pp collisions at ATLAS

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 / Gramling, Johanna Léna / 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 / Vallecorsa, Sofia / Wu, Xin
Published in Journal of High Energy Physics. 2014, vol. 1407, p. 154-206
Collection Open Access - SCOAP3
Abstract The prompt and non-prompt production cross-sections for the χ c 1 and χ c 2 charmonium states are measured in pp collisions at √s = 7 TeV with the ATLAS detector at the LHC using 4 . 5 fb −1 of integrated luminosity. The χ c states are reconstructed through the radiative decay χ c → J/ψγ (with J/ψ → μ + μ − ) where photons are reconstructed from γ → e + e − conversions. The production rate of the χ c 2 state relative to the χ c 1 state is measured for prompt and non-prompt χ c as a function of J/ψ transverse momentum. The prompt χ c cross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χ c decays. The fractions of χ c 1 and χ c 2 produced in b -hadron decays are also measured.
Keywords Hadron-Hadron Scattering
arXiv: 1404.7035
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ATLAS COLLABORATION. Measurement of χ c 1 and χ c 2 production with √s = 7 TeV pp collisions at ATLAS. In: Journal of High Energy Physics, 2014, vol. 1407, p. 154-206. doi: 10.1007/JHEP07(2014)154 https://archive-ouverte.unige.ch/unige:55790

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Deposited on : 2015-04-27

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