Measurement of chi(c1) and chi(c2) production with root s=7 TeV pp collisions at ATLAS
Number of Authors: 2960
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 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.
IdentifiersURN: urn:nbn:se:kth:diva-151382DOI: 10.1007/JHEP07(2014)154ISI: 000340391300001ScopusID: 2-s2.0-84925745749OAI: oai:DiVA.org:kth-151382DiVA: diva2:748416
FunderSwedish Research Council
QC 201409192014-09-192014-09-192014-09-19Bibliographically approved