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Prompt production of charmonium $\chi_{c0}$, $\chi_{c1}$ and $\chi_{c2}$mesons is studied using proton-proton collisions at the LHC at a centre-of-massenergy of $\sqrt{s}=7$TeV. The $\chi_{c}$ mesons are identified through theirdecay to $J/\psi\gamma$, with $J/\psi\to\mu^+\mu^-$ using photons thatconverted in the detector. A data sample, corresponding to an integratedluminosity of $1.0\mathrm{fb}^{-1}$ collected by the LHCb detector, is used tomeasure the relative prompt production rate of $\chi_{c1}$ and $\chi_{c2}$ inthe rapidity range $2.0<y<4.5$ as a function of the $J/\psi$ transversemomentum from 3 to 20 GeV$/c$. First evidence for $\chi_{c0}$ meson productionat a high-energy hadron collider is also presented.

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