Measurement of the ${\eta }_c(1S)$ production cross-section in proton-proton collisions via the decay ${\eta }_c(1S)\to p\bar{p}$

Abstract

The production of the ${\eta }_c(1S)$ state in proton-proton collisions is probed via its decay to the $p\bar{p}$ final state with the LHCb detector, in the rapidity range $2.0<y<4.5$ and in the meson transverse-momentum range $p_T>6.5$ GeV/c. The cross-section for prompt production of ${\eta }_c(1S)$ mesons relative to the prompt $J/\psi$ cross-section is measured, for the first time, to be ${\sigma }_{{\eta }_c(1S)}/{\sigma }_{J/\psi }=1.74\pm 0.29\pm 0.28\pm 0.18_B$ at a centre-of-mass energy $\sqrt{s}=7$ TeV using data corresponding to an integrated luminosity of 0.7 fb${}^{-1}$, and ${\sigma }_{{\eta }_c(1S)}/{\sigma }_{J/\psi }=1.60\pm 0.29\pm 0.25\pm 0.17_B$ at $\sqrt{s}=8$ TeV using 2.0 fb${}^{-1}$. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the ${\eta }_c(1S)$ and $J/\psi$ decays to the $p\bar{p}$ final state. In addition, the inclusive branching fraction of $b$-hadron decays into ${\eta }_c(1S)$ mesons is measured, for the first time, to be $B(b\to {\eta }_{c}X)=(4.88\pm 0.64\pm 0.29\pm 0.67_B)\times 10^{-3}$, where the third uncertainty includes also the uncertainty on the $J/\psi$ inclusive branching fraction from $b$-hadron decays. The difference between the $J/\psi$ and ${\eta }_c(1S)$ meson masses is determined to be $114.7\pm 1.5\pm 0.1$ MeV/c${}^2$.

20 pages, 3 figures

References in corpus (8)

• PYTHIA 6.4 Physics and Manual
• Big-Bang Nucleosynthesis
• Heavy quarkonium: progress, puzzles, and opportunities
• J/psi (psi') production at the Tevatron and LHC at O(α_s^4v^4) in nonrelativistic QCD
• Measurement of $J/\psi$ polarization in $pp$ collisions at $\sqrt{s}=7$ TeV
• Measurement of prompt J/psi and beauty hadron production cross sections at mid-rapidity in pp collisions at sqrt(s) = 7 TeV
• Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+
• Measurement of the relative rate of prompt ${\chi }_{c0}$, ${\chi }_{c1}$ and ${\chi }_{c2}$ production at $\sqrt{s}=7$TeV

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