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Measurement of the relative rate of prompt $\chi_{c0}$, $\chi_{c1}$ and $\chi_{c2}$ production at $\sqrt{s}=7$TeV

The LHCb collaboration
JHEP 1310 (2013) 115, 2013

Abstract (data abstract)
CERN-LHC. Prompt production of charmonium $\chi_{c0}$, $\chi_{c1}$ and $\chi_{c1}$ mesons is studied using proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. The $\chi_{c}$ mesons are identified through their decay to $J/\psi$ $\gamma$, with $J/\psi \rightarrow \mu^+ \mu^-$ using photons that converted in the detector. A data sample, corresponding to an integrated luminosity of 1.0 fb-1 collected by the LHCb detector, is used to measure the relative prompt production rate of $\chi_{c1}$ and $\chi_{c2}$ in the rapidity range 2.0 < y < 4.5 as a function of the Jpsi transverse momentum from 3 to 20 GeV/c. First evidence for $\chi_{c0}$ meson production at a high-energy hadron collider is also presented.

  • Table 1

    Data from T 3


    Measurements of the ratio of $\chi_{c2}$ to $\chi_{c1}$ production cross-sections for the given $J/\psi$ $p_T$ range assuming unpolarized $\chi_c$ production....

  • Table 2

    Data from P 12


    Ratio of $\chi_{c0}$ to $\chi_{c2}$ in the observed $J/\psi$\ $p_T$ range from 4-20 GeV. Also given is the $\chi_{c2}$ to...

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