Measurement of chi(c1) and chi(c2) production with root s=7 TeV pp collisions at ATLAS

The prompt and non-prompt production cross-sections for the chi(c1) and chi(c2) charmonium states are measured in pp collisions at root s = 7TeV with the ATLAS detector at the LHC using 4.5 fb(-1) of integrated luminosity. The chi(c) states are reconstructed through the radiative decay chi c -&g...

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Published in:The journal of high energy physics 2014 (7), p.154
Main Authors: Aad, G., Jovicevic, Jelena, Kuwertz, Emma, Lund-Jensen, Bengt, Morley, Anthony, Strandberg, Jonas, Zwalinski, L., et al
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Language:English
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Hadron-Hadron Scattering
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container_issue 7
container_start_page 154
container_title The journal of high energy physics
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creator Aad, G.
Jovicevic, Jelena
Kuwertz, Emma
Lund-Jensen, Bengt
Morley, Anthony
Strandberg, Jonas
Zwalinski, L.
et al
description The prompt and non-prompt production cross-sections for the chi(c1) and chi(c2) charmonium states are measured in pp collisions at root s = 7TeV with the ATLAS detector at the LHC using 4.5 fb(-1) of integrated luminosity. The chi(c) states are reconstructed through the radiative decay chi c -> J/psi gamma ( with J/psi -> mu(+)mu(-)) where photons are reconstructed from gamma -> e(+)e(-) conversions. The production rate of the chi(c2) state relative to the chi(c1) state is measured for prompt and non-prompt chi(c) as a function of J/psi transverse momentum. The prompt chi(c) cross-sections are combined with existing measurements of prompt J/psi production to derive the fraction of prompt J/psi produced in feed-down from chi(c) decays. The fractions of chi(c1) and chi(c2) produced in b-hadron decays are also measured.
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subjects Hadron-Hadron Scattering
title Measurement of chi(c1) and chi(c2) production with root s=7 TeV pp collisions at ATLAS
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