Measurement of χc1 and χc2 production with s√ = 7 TeV pp collisions at ATLAS

Aad, G. and Abajyan, T. and Abbott, B. and Abdallah, J. and Khalek, S. A. 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, P. and Ahmad, A. and Ahmadov, F. and Aielli, G. and Akesson, T. P. A. and Akimoto, G. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2014) Measurement of χc1 and χc2 production with s√ = 7 TeV pp collisions at ATLAS. JOURNAL OF HIGH ENERGY PHYSICS (7). ISSN 1126-6708

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Abstract

The prompt and non-prompt production cross-sections for th e 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/ψ γ (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.

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