Inclusive production of the $P_c$ resonances in $p\overline{p}$ collisions

Abstract

We present a study of the inclusive production in $p\overline{p}$ collisions of the pentaquark states $P_c(4440)$ and $P_c(4457)$ with the decay to the $J/\psi p$ final state previously observed by the LHCb experiment. Using a sample of candidates originating from decays of $b$-flavored hadrons, we find an enhancement in the $J/\psi p$ invariant mass distribution consistent with a sum of $P_c(4440)$ and $P_c(4457)$. The significance, with the input parameters set to the LHCb values, is $3.0\sigma$. This is the first confirmatory evidence for these pentaquark states. We measure the ratio $N_{\mathrm{prompt}}/N_{\mathrm{nonprompt}}=0.05\pm 0.39$ and set an upper limit of 0.8 at the 95\% credibility level. The ratio of the yield of the $P_c(4312)$ to the sum of $P_c(4440)$ and $P_c(4457)$ is less than 0.6 at the 95\% credibility level. The study is based on $10.4\mathrm{f}{\mathrm{b}}^{-1}$ of data collected by the D0 experiment at the Fermilab Tevatron collider.

arXiv comment7 pages, 3 figures

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