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Measurement of χ c1 and χ c2 production with s√ = 7 TeV pp collisions at ATLAS

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  • The ATLAS collaboration
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Article number154
<mark>Journal publication date</mark>30/07/2014
<mark>Journal</mark>Journal of High Energy Physics
Issue number7
Volume2014
Number of pages52
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The prompt and non-prompt production cross-sections for the χ c1 and χ c2 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 c2 state relative to the χ c1 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 c1 and χ c2 produced in b-hadron decays are also measured.

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JHEP is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0