Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/109487
Title: Measurement of χc1and χc2production with √s = 7 TeV pp collisions at ATLAS
Authors: Santos, S. P. Amor dos 
Carvalho, J. 
Fiolhais, M. C. N. 
Galhardo, B. 
Oliveira, M.
Veloso, F. 
Wolters, H. 
ATLAS Collaboration
Keywords: Hadron-Hadron Scattering
Issue Date: 2014
Publisher: Springer Nature
Serial title, monograph or event: Journal of High Energy Physics
Volume: 2014
Issue: 7
Abstract: The prompt and non-prompt production cross-sections for the χc1and χc2charmonium states are measured in pp collisions at √s = 7TeV with the ATLAS detector at the LHC using 4.5 fb−1of integrated luminosity. The χcstates are reconstructed through the radiative decay χc→ J/ψγ (with J/ψ → μ+μ−) where photons are reconstructed from γ → e+e− conversions. The production rate of the χc2state relative to the χc1state is measured for prompt and non-prompt χcas a function of J/ψ transverse momentum. The prompt χccross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χcdecays. The fractions of χc1and χc2produced in b-hadron decays are also measured.
URI: https://hdl.handle.net/10316/109487
DOI: 10.1007/JHEP07(2014)154
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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