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Study of Upsilon production and cold nuclear matter effects in pPb collisions at sqrt{s_(NN)}=5~TeV
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arxiv 1405.5152 v2 pith:KQPVKQMY submitted 2014-05-20 nucl-ex hep-ex
Study of Upsilon production and cold nuclear matter effects in pPb collisions at sqrt{s_(NN)}=5~TeV
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Production of $\Upsilon$ mesons in proton-lead collisions at a nucleon-nucleon centre-of-mass energy $\sqrt{s_{NN}}=5 \mathrm{TeV}$ is studied with the LHCb detector. The analysis is based on a data sample corresponding to an integrated luminosity of $1.6 \mathrm{nb}^{-1}$. The $\Upsilon$ mesons of transverse momenta up to $15 \mathrm{GeV}/c$ are reconstructed in the dimuon decay mode. The rapidity coverage in the centre-of-mass system is $1.5<y<4.0$ (forward region) and $-5.0<y<-2.5$ (backward region). The forward-backward production ratio and the nuclear modification factor for $\Upsilon(1S)$ mesons are determined. The data are compatible with the predictions for a suppression of $\Upsilon(1S)$ production with respect to proton-proton collisions in the forward region, and an enhancement in the backward region. The suppression is found to be smaller than in the case of prompt $J/\psi$ mesons.
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Nuclear Cold QCD: Review and Future Strategy
hep-ph 2025-06 unverdicted novelty 2.0
Review summarizing observed cold nuclear matter modifications in hadron-nucleus collision data and proposing experimental strategies for the EIC to clarify underlying QCD mechanisms.
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