$ϒ$ production in p–Pb collisions at $\sqrt{s_{NN}}$=8.16 TeV
Phys.Lett. B806 (2020) 135486, 2020.
The ALICE collaboration

Abstract (data abstract)
CERN-LHC-ALICE. $\Upsilon$ production in $\mbox{p--Pb}$ interactions is studied at the centre-of-mass energy per nucleon--nucleon collision $\sqrt{s_{_{\rm {NN}}}} = 8.16$~TeV with the ALICE detector at the CERN LHC. The measurement is performed reconstructing bottomonium resonances via their dimuon decay channel, in the centre-of-mass rapidity intervals $2.03<y_{\rm{cms}}<3.53$ and $-4.46<y_{\rm{cms}}<-2.96$, down to zero transverse momentum. In this work, results on the $\Upsilon$(1S) production cross section as a function of rapidity and transverse momentum are presented. The corresponding nuclear modification factor shows a suppression of the $\Upsilon$(1S) yields with respect to \mbox{pp} collisions, both at forward and backward rapidity. This suppression is stronger in the low transverse momentum region and shows no significant dependence on the centrality of the interactions. Furthermore, the $\Upsilon$(2S) nuclear modification factor is evaluated, suggesting a suppression similar to that of the $\Upsilon$(1S). A first measurement of the $\Upsilon$(3S) has also been performed. Finally, results are compared with previous ALICE measurements in $\mbox{p--Pb}$ collisions at $\sqrt{s_{_{\rm {NN}}}} = 8.16$~TeV and with theoretical calculations.

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