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$ϒ$ production in p–Pb collisions at $\sqrt{s_{NN}}$=8.16 TeV

The collaboration
Phys.Lett. B806 (2020) 135486, 2020.

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.

• #### Table 1

Data from Figure 2

10.17182/hepdata.95539.v1/t1

$\Upsilon$(1S) differential cross section as a function of $y_{\rm cms}$, in p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The...

• #### Table 2

Data from Figure 2

10.17182/hepdata.95539.v1/t2

$\Upsilon$(2S) differential cross section times as a function of $y_{\rm cms}$, in p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 8.16 TeV....

• #### Table 3

Data from Figure 2

10.17182/hepdata.95539.v1/t3

$\Upsilon$(3S) differential cross section as a function of $y_{\rm cms}$, in p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The...

• #### Table 4

Data from Figure 3 (closed symbols)

10.17182/hepdata.95539.v1/t4

$\Upsilon$(1S) differential cross section as a function of $p_{\rm T}$, at forward rapidity at $\sqrt{s_{\rm NN}}$ = 8.16 TeV .The...

• #### Table 5

Data from Figure 3 (open symbols)

10.17182/hepdata.95539.v1/t5

$\Upsilon$(1S) differential cross section as a function of $p_{\rm T}$, at backward rapidity at $\sqrt{s_{\rm NN}}$ = 8.16 TeV .The...

• #### Table 6

Data from Figure 4

10.17182/hepdata.95539.v1/t6

Ratio of $\Upsilon$(2S) over $\Upsilon$(1S) yields in p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 8.16 TeV .The first uncertainty is statistical,...

• #### Table 7

Data from Figure 4

10.17182/hepdata.95539.v1/t7

Ratio of $\Upsilon$(3S) over $\Upsilon$(1S) yields in p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 8.16 TeV .The first uncertainty is statistical,...

• #### Table 8

Data from Figure 5

10.17182/hepdata.95539.v1/t8

$\Upsilon$(1S) $R_{\rm pPb}$ values at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first uncertainty is statistical, the second is the uncorrelated...

• #### Table 9

Data from Figure 6

10.17182/hepdata.95539.v1/t9

$\Upsilon$(1S) $R_{\rm pPb}$ as a function of $y_{\rm {cms}}$ at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first uncertainty is statistical,...

• #### Table 10

Data from Figure 7 (Left)

10.17182/hepdata.95539.v1/t10

$\Upsilon$(1S) $R_{\rm pPb}$ as a function of $p_{\rm T}$ at backward rapidity at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first...

• #### Table 11

Data from Figure 7 (Right)

10.17182/hepdata.95539.v1/t11

$\Upsilon$(1S) $R_{\rm pPb}$ as a function of $p_{\rm T}$ at forward rapidity at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first...

• #### Table 12

Data from Figure 8 (Left)

10.17182/hepdata.95539.v1/t12

$\Upsilon$(1S) $Q_{\rm pPb}$ as a function of $<N_{\rm coll}>$ at backward rapidity at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first...

• #### Table 13

Data from Figure 8 (Right)

10.17182/hepdata.95539.v1/t13

$\Upsilon$(1S) $Q_{\rm pPb}$ as a function of $<N_{\rm coll}>$ at forward rapidity at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first...

• #### Table 14

Data from Figure 9 (RED)

10.17182/hepdata.95539.v1/t14

$\Upsilon$(1S) $R_{\rm pPb}$ values at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first uncertainty is statistical, the second is the uncorrelated...

• #### Table 15

Data from Figure 9 (AZURE)

10.17182/hepdata.95539.v1/t15

$\Upsilon$(2S) $R_{\rm pPb}$ values at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first uncertainty is statistical, the second is the uncorrelated...

• #### Table 16

Data from Figure 9 (GREEN)

10.17182/hepdata.95539.v1/t16

$\Upsilon$(3S) $R_{\rm pPb}$ values at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The first uncertainty is statistical, the second is the uncorrelated...

• #### Table 17

Data from Figure 9 (BLUE)

10.17182/hepdata.95539.v1/t17

Ratio of $\Upsilon$(2S) to $\Upsilon$(1S) $R_{\rm pPb}$ at $\sqrt{s_{\rm NN}}$ = 8.16 TeV as a function of $y_{\rm cms}$ .The...

• #### Table 18

Data from Figure 9 (RED)

10.17182/hepdata.95539.v1/t18

Ratio of $\Upsilon$(3S) to $\Upsilon$(1S) $R_{\rm pPb}$ at $\sqrt{s_{\rm NN}}$ = 8.16 TeV as a function of $y_{\rm cms}$ .The...