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Measurement of chi(c1) and chi(c2) production with root s=7 TeV pp collisions at ATLAS
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 2960
2014 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 7, 154- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. no 7, 154- p.
Keyword [en]
Hadron-Hadron Scattering
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-151382DOI: 10.1007/JHEP07(2014)154ISI: 000340391300001Scopus ID: 2-s2.0-84925745749OAI: oai:DiVA.org:kth-151382DiVA: diva2:748416
Funder
Swedish Research Council
Note

QC 20140919

Available from: 2014-09-19 Created: 2014-09-19 Last updated: 2017-12-05Bibliographically approved

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Strandberg, Jonas

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  • apa
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