Measurement of chi(c1) and chi(c2) production with root s=7 TeV pp collisions at ATLAS
Number of Authors: 2933
2014 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, no 7, 154- p.Article in journal (Refereed) Published
The prompt and non-prompt production cross-sections for the χ c1 and χ c2 charmonium states are measured in pp collisions at TeX = 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.
Place, publisher, year, edition, pages
2014. no 7, 154- p.
IdentifiersURN: urn:nbn:se:uu:diva-232771DOI: 10.1007/JHEP07(2014)154ISI: 000340391300001OAI: oai:DiVA.org:uu-232771DiVA: diva2:749674
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP07(2014)1542014-09-242014-09-242014-09-24Bibliographically approved