Study of $\ddot{I}ˆ(2S)$ production and cold nuclear matter effects in pPb collisions at $\sqrt{s_{NN}}=5\mathrm{TeV}$

Abstract

The production of $\ddot{I}ˆ(2S)$ mesons is studied in dimuon final states using proton-lead collision data collected by the LHCb detector. The data sample corresponds to an integrated luminosity of $1.6{\mathrm{nb}}^{-1}$. The nucleon-nucleon centre-of-mass energy of the proton-lead collisions is $\sqrt{s_{NN}}=5\mathrm{TeV}$. The measurement is performed using $\ddot{I}ˆ(2S)$ mesons with transverse momentum less than $14\mathrm{GeV}/c$ and rapidity $y$ in the ranges $1.5<y<4.0$ and $-5.0<y<-2.5$ in the nucleon-nucleon centre-of-mass system. The forward-backward production ratio and the nuclear modification factor are determined for $\ddot{I}ˆ(2S)$ mesons. Using the production cross-section results of $\ddot{I}ˆ(2S)$ and $J/\ddot{I}ˆ$ mesons from $b$-hadron decays, the $b\bar{b}$ cross-section in pPb collisions at $\sqrt{s_{NN}}=5\mathrm{TeV}$ is obtained.

23 pages, 7 figures and 3 tables. All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-058.html