The prompt production of the charmonium χ c1 and χ c2 mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of s=7 TeV. The χ c mesons are identified through their decays χ c→J/ψγ with J/ψ→μ +μ - using 36 pb -1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for the two χ c spin states, σ(χ c2)/σ(χ c1), has been determined as a function of the J/ψ transverse momentum, pTJ/ψ, in the range from 2 to 15 GeV/c. The results are in agreement with the next-to-leading order non-relativistic QCD model at high pTJ/ψ and lie consistently above the pure leading-order colour-singlet prediction. © 2012 CERN.

Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., et al. (2012). Measurement of the cross-section ratio σ(χ c2)/σ(χ c1) for prompt χ c production at s=7 TeV. PHYSICS LETTERS. SECTION B, 714(2-5), 215-223 [10.1016/j.physletb.2012.06.077].

Measurement of the cross-section ratio σ(χ c2)/σ(χ c1) for prompt χ c production at s=7 TeV

CALVI, MARTA;KUCHARCZYK, MARCIN;PEREGO, DAVIDE LUIGI;PESSINA, GIANLUIGI EZIO;
2012

Abstract

The prompt production of the charmonium χ c1 and χ c2 mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of s=7 TeV. The χ c mesons are identified through their decays χ c→J/ψγ with J/ψ→μ +μ - using 36 pb -1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for the two χ c spin states, σ(χ c2)/σ(χ c1), has been determined as a function of the J/ψ transverse momentum, pTJ/ψ, in the range from 2 to 15 GeV/c. The results are in agreement with the next-to-leading order non-relativistic QCD model at high pTJ/ψ and lie consistently above the pure leading-order colour-singlet prediction. © 2012 CERN.
Articolo in rivista - Articolo scientifico
Nuclear and High Energy Physics; Heavy Flavour Physics, LHC Collider
English
215
223
9
Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., et al. (2012). Measurement of the cross-section ratio σ(χ c2)/σ(χ c1) for prompt χ c production at s=7 TeV. PHYSICS LETTERS. SECTION B, 714(2-5), 215-223 [10.1016/j.physletb.2012.06.077].
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