The prompt production of charmonium χ c ; J/ψ states is studied in proton-proton collisions at a centre-of-mass energy of s=7 TeV at the Large Hadron Collider. The χ c ; J/ψ mesons are identified through their decays χ c→J/ψγ ; 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 χ c ; J/ψ, σ(χ c→J/ψγ)/σ(J/ψ), is determined as a function of the J/ψ transverse momentum in the range 2<pTJ/ψ<15 GeV/c. The results are in excellent agreement with next-to-leading order non-relativistic expectations ; show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low pTJ/ψ region. © 2012 CERN.
Measurement of the ratio of prompt χ c to J/ψ production in pp collisions at √s=7 TeV
PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2012-01-01
Abstract
The prompt production of charmonium χ c ; J/ψ states is studied in proton-proton collisions at a centre-of-mass energy of s=7 TeV at the Large Hadron Collider. The χ c ; J/ψ mesons are identified through their decays χ c→J/ψγ ; 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 χ c ; J/ψ, σ(χ c→J/ψγ)/σ(J/ψ), is determined as a function of the J/ψ transverse momentum in the range 2I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.