Measurement of χc1and χc2production with √s = 7 TeV pp collisions at ATLAS

The ATLAS collaboration

Research output: Contribution to journalArticlepeer-review


The prompt and non-prompt production cross-sections for the χc1and χc2charmonium states are measured in pp collisions at √s = 7TeV with the ATLAS detector at the LHC using 4.5 fb−1of integrated luminosity. The χcstates 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 χc2state relative to the χc1state is measured for prompt and non-prompt χcas a function of J/ψ transverse momentum. The prompt χccross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χcdecays. The fractions of χc1and χc2produced in b-hadron decays are also measured.

Original languageEnglish (US)
Article number154
JournalJournal of High Energy Physics
Issue number7
StatePublished - Jul 30 2014


  • Hadron-hadron scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'Measurement of χc1and χc2production with √s = 7 TeV pp collisions at ATLAS'. Together they form a unique fingerprint.

Cite this