Observation of $Z$ production in proton-lead collisions at LHCb

Abstract

The first observation of $Z$ boson production in proton-lead collisions at a centre-of-mass energy per proton-nucleon pair of $\sqrt{s_{NN}}=5\text{TeV}$ is presented. The data sample corresponds to an integrated luminosity of $1.6{\text{nb}}^{-1}$ collected with the LHCb detector. The $Z$ candidates are reconstructed from pairs of oppositely charged muons with pseudorapidities between 2.0 and 4.5 and transverse momenta above $20\text{GeV}/c$. The invariant dimuon mass is restricted to the range $60-120\text{GeV}/c^2$. The $Z$ production cross-section is measured to be \begin{eqnarray*} σ_{Z\toμ^+μ^-}(\text{fwd})&=&13.5^{+5.4}_{-4.0}\text{(stat.)}\pm1.2\text{(syst.)}~\text{nb} \end{eqnarray*} in the direction of the proton beam and \begin{eqnarray*} σ_{Z\toμ^+μ^-}(\text{bwd}) & =&10.7^{+8.4}_{-5.1}\text{(stat.)}\pm1.0\text{(syst.)}~\text{nb} \end{eqnarray*} in the direction of the lead beam, where the first uncertainty is statistical and the second systematic.

arXiv comment19 pages, 3 figures

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