Measurement of $$χ$$c1 and $$χ$$c2 production with $$ \sqrt{s} $$ = 7 TeV $pp$ collisions at ATLAS
Journal Article
·
· Journal of High Energy Physics (Online)
The prompt and non-prompt production cross-sections for the χc1 and χc2 charmonium states are measured in pp collisions at $$ \sqrt{s} $$ = 7 TeV with the ATLAS detector at the LHC using 4.5 fb-1 of integrated luminosity. The χc states 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 χc2 state relative to the χc1 state is measured for prompt and non-prompt χc as a function of J/ψ transverse momentum. The prompt χc 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 χc decays. The fractions of χc1 and χc2 produced in b-hadron decays are also measured.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- The ATLAS collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1523937
- Alternate ID(s):
- OSTI ID: 1162381
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 7 Vol. 2014; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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