Measurement of the prompt $D^0$ nuclear modification factor in $p$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV

Abstract

The production of prompt $D^0$ mesons in proton-lead collisions in the forward and backward configurations at a center-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=8.16\mathrm{TeV}$ is measured by the LHCb experiment. The nuclear modification factor of prompt $D^0$ mesons is determined as a function of the transverse momentum $p_{\mathrm{T}}$, and rapidity in the nucleon-nucleon center-of-mass frame $y^{\ast }$. In the forward rapidity region, significantly suppressed production with respect to $pp$ collisions is measured, which provides significant constraints of nuclear parton distributions and hadron production down to the very low Bjorken-$x$ region of $\sim 10^{-5}$. In the backward rapidity region, a suppression with a significance of 2.0 - 3.8 standard deviations compared to nPDF expectations is found in the kinematic region of $p_{\mathrm{T}}>6\mathrm{GeV}/c$ and $-3.25<y^{\ast }<-2.5$, corresponding to $x\sim 0.01$.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-007.html (LHCb public pages)

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