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

Abstract

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-mass energy of $\sqrt{s}=7$TeV. The ${\chi }_c$ mesons are identified through their decay to $J/\psi \gamma$, with $J/\psi \to {\mu }^{+}{\mu }^{-}$ using photons that converted in the detector. A data sample, corresponding to an integrated luminosity of $1.0{\mathrm{fb}}^{-1}$ 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 $J/\psi$ transverse momentum from 3 to 20 GeV$/c$. First evidence for ${\chi }_{c0}$ meson production at a high-energy hadron collider is also presented.

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