The prompt production of charmonium χ c and 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 and J/ψ mesons are identified through their decays χ c→J/ψγ and 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 and 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 <15 GeV/c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low pTJ/ψ region. © 2012 CERN.
CITATION STYLE
Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., … Zvyagin, A. (2012). Measurement of the ratio of prompt χ c to J/ψ production in pp collisions at √s=7 TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 718(2), 431–440. https://doi.org/10.1016/j.physletb.2012.10.068
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