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

Cerri, A, De Santo, A, Grout, Z J, Potter, C T, Salvatore, F, Santoyo Castillo, I, Sutton, M, Vivarelli, I and others (ATLAS collaboration), (2014) Measurement of χ c1 and χ c2 production with s√ = 7 TeV pp collisions at ATLAS. Journal of High Energy Physics, 2014 (7). ISSN 1029-8479

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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.

Item Type: Article
Additional Information: Published as part of ATLAS collaboration
Keywords: Hadron-Hadron Scattering
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy > QB0460 Astrophysics
Q Science > QC Physics
Q Science > QC Physics > QC0770 Nuclear and particle physics. Atomic energy. Radioactivity
Q Science > QC Physics > QC0770 Nuclear and particle physics. Atomic energy. Radioactivity > QC0793 Elementary particle physics
Depositing User: Samuel Appleton
Date Deposited: 17 Jul 2015 07:46
Last Modified: 07 Mar 2017 11:53
URI: http://sro.sussex.ac.uk/id/eprint/55402

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Project NameSussex Project NumberFunderFunder Ref
Consolidated GrantG0927STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/K001329/1