Measurement of $J/\psi$ production in $pp$ collisions at $\sqrt{s}=2.76$ TeV
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Publication date
December 2012
DOI Publisher
Springer Science and Business Media LLCAbstract
The production of $J/\psi$ mesons is studied with the LHCb detector using data from $pp$ collisions at $\sqrt{s}=2.76\, {\rm TeV}$ corresponding to an integrated luminosity of $71\,{\rm nb}^{-1}$. The differential cross-section for inclusive $J/\psi$ production is measured as a function of its transverse momentum $p_{\rm T}$. The cross-section in the fiducial region $0<p_{\rm T}<12\,{\rm GeV}/c$ and rapidity $2.0<y<4.5$ is measured to be $5.6\pm 0.1\,({\rm stat})\pm 0.4\,({\rm syst})\,\mu{\rm b}$, with the assumption of unpolarised $J/\psi$ production. The fraction of $J/\psi$ production from $b$-hadron decays is measured to be $(7.1\pm 0.6\,({\rm stat})\pm0.7\,({\rm syst}))\%$
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