Measurement of χ[subscript c1] and χ[subscript c2] Production with = 7 TeV Pp Collisions at ATLAS
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Aad-2014-Measurement of chi(c.pdf
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Author(s)
ATLAS Collaboration
Taylor, Frank E.
Alternative Title
Measurement of χ c1 and χ c2 production with √s = 7 TeV pp collisions at ATLAS
Date Issued
July 2014
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag Berlin Heidelberg
Citation
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, et al. “Measurement of χ[subscript c1] and χ[subscript c2] Production with √s = 7 TeV Pp Collisions at ATLAS.” J. High Energ. Phys. 2014, no. 7 (July 2014).
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/jhep07(2014)154
