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Measurement of prompt D$^{0}$, D$^{+}$, D$^{*+}$, and ${\mathrm{D}}_{\mathrm{S}}^{+}$ production in p–Pb collisions at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}$ = 5.02 TeV

The collaboration
JHEP 1912 (2019) 092, 2019

Abstract
The measurement of the production of prompt D$^0$, D$^+$, D$^{*+}$, and D$^+_s$ mesons in proton$-$lead (p$-$Pb) collisions at the centre-of-mass energy per nucleon pair of $\sqrt{s_{\rm NN}}$ = 5.02 TeV, with an integrated luminosity of $292\pm 11$ $\mu$b$^{-1}$, are reported. Differential production cross sections are measured at mid-rapidity ($-0.96<y_{\rm cms}<0.04$) as a function of transverse momentum ($p_{\rm T}$) in the intervals $0< p_{\rm T} < 36$ GeV/$c$ for D$^0$, $1< p_{\rm T} <36$ GeV/$c$ for D$^+$ and D$^{*+}$, and $2< p_{\rm T} <24$ GeV/$c$ for D$^+_s$ mesons. For each species, the nuclear modification factor $R_{\rm pPb}$ is calculated as a function of $p_{\rm T}$ using a proton-proton (pp) reference measured at the same collision energy. The results are compatible with unity in the whole $p_{\rm T}$ range. The average of the non-strange D mesons $R_{\rm pPb}$ is compared with theoretical model predictions that include initial-state effects and parton transport model predictions. The $p_{\rm T}$ dependence of the D$^0$, D$^+$, and D$^{*+}$ nuclear modification factors is also reported in the interval $1< p_{\rm T} < 36$ GeV/$c$ as a function of the collision centrality, and the central-to-peripheral ratios are computed from the D-meson yields measured in different centrality classes. The results are further compared with charged-particle measurements and a similar trend is observed in all the centrality classes. The ratios of the $p_{\rm T}$-differential cross sections of D$^0$, D$^+$, D$^{*+}$, and D$^+_s$ mesons are also reported. The D$^+_s$ and D$^+$ yields are compared as a function of the charged-particle multiplicity for several $p_{\rm T}$ intervals. No modification in the relative abundances of the four species is observed with respect to pp collisions within the statistical and systematic uncertainties.

• #### Prompt D0 without vertexing analysis, Figure 6

Data from Figure 6,right panel

10.17182/hepdata.93013.v1/t1

• #### Inclusive D0 pp reference, Figure 6

Data from Figure 6, left panel

10.17182/hepdata.93013.v1/t3

$p_{\rm{T}}$ differential cross section of inclusive D0 mesons from the analysis without vertexing reconstruction in pp collisions at $\mathbf{\sqrt{{\textit s}}~=~5.02~TeV}$...

• #### D0 pPb cross section, Figure 7

Data from Figure 7

10.17182/hepdata.93013.v1/t4

$p_{\rm{T}}$ differential cross section of prompt D0 mesons in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$. For $0<p_{\rm{T}}<1$ GeV/$c$ the cross...

• #### D0 pp reference, Figure 7

Data from Figure 7

10.17182/hepdata.93013.v1/t5

$p_{\rm{T}}$ differential cross section of prompt D0 mesons in pp collisions at $\mathbf{\sqrt{\textit s}~=~5.02~TeV}$ multiplied by A=208. For $0<p_{\rm{T}}<1$ GeV/$c$...

• #### D* pPb cross section, Figure 7

Data from Figure 7

10.17182/hepdata.93013.v1/t6

$p_{\rm{T}}$ differential cross section of prompt D* mesons in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$.

• #### D* pp reference, Figure 7

Data from Figure 7

10.17182/hepdata.93013.v1/t7

$p_{\rm{T}}$ differential cross section of prompt D* mesons in pp collisions at $\mathbf{\sqrt{{\textit s}}~=~5.02~TeV}$ multiplied by A=208.

• #### D+ pPb cross section, Figure 7

Data from Figure 7

10.17182/hepdata.93013.v1/t8

$p_{\rm{T}}$ differential cross section of prompt D+ mesons in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$.

• #### D+ pp reference, Figure 7

Data from Figure 7

10.17182/hepdata.93013.v1/t9

$p_{\rm{T}}$ differential cross section of prompt D+ mesons in pp collisions at $\mathbf{\sqrt{{\textit s}}~=~5.02~TeV}$ multiplied by A=208.

• #### Ds pPb cross section, Figure 7

Data from Figure 7

10.17182/hepdata.93013.v1/t10

$p_{\rm{T}}$ differential cross section of prompt Ds mesons in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$.

• #### Ds pp reference, Figure 7

Data from Figure 7

10.17182/hepdata.93013.v1/t11

$p_{\rm{T}}$ differential cross section of prompt Ds mesons in pp collisions at $\mathbf{\sqrt{{\textit s}}~=~5.02~TeV}$ multiplied by A=208.

• #### RpPb D0, Figure 8

Data from Figure 8, left panel

10.17182/hepdata.93013.v1/t12

$R_{\rm{pPb}}$ of prompt D0 mesons in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$.

• #### RpPb D*, Figure 8

Data from Figure 8, left panel

10.17182/hepdata.93013.v1/t13

$R_{\rm{pPb}}$ of prompt D* mesons in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$.

• #### RpPb D+, Figure 8

Data from Figure 8, left panel

10.17182/hepdata.93013.v1/t14

$R_{\rm{pPb}}$ of prompt D+ mesons in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$.

• #### RpPb Ds, Figure 8

Data from Figure 8, right panel

10.17182/hepdata.93013.v1/t15

$R_{\rm{pPb}}$ of prompt Ds mesons in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$.

• #### RpPb average non strange D mesons, Figure 8

Data from Figure 8

10.17182/hepdata.93013.v1/t16

$R_{\rm{pPb}}$ of prompt non-strange D mesons in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$.

• #### QpPb, Figure 10

Data from Figure 10

10.17182/hepdata.93013.v1/t17

$Q_{\rm pPb}$ of prompt D mesons in different centrality classes in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$

• #### Qcp, Figure 12

Data from Figure 12

10.17182/hepdata.93013.v1/t18

$Q_{\rm CP}$ of prompt D mesons in different centrality classes in p-Pb collisions at $\mathbf{\sqrt{{\textit s}_{\rm NN}}~=~5.02~TeV}$

• #### D+/D0, Figure 13

Data from Figure 13

10.17182/hepdata.93013.v1/t19

• #### Ds+/D0, Figure 13

Data from Figure 13

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• #### Ds+/D+ ratio vs DN/DETA(NCH), PT(D) 2 TO 4, Figure 14

Data from Figure 14

10.17182/hepdata.93013.v1/t23

Ratio of prompt Ds+ over D+ production cross section as a function of the charged particle pseudorapidity density in p-Pb...

• #### Ds+/D+ ratio vs DN/DETA(NCH), PT(D) 4 TO 6, Figure 14

Data from Figure 14

10.17182/hepdata.93013.v1/t24

Ratio of prompt Ds+ over D+ production cross section as a function of the charged particle pseudorapidity density in p-Pb...

• #### Ds+/D+ ratio vs DN/DETA(NCH), PT(D) 6 TO 8, Figure 14

Data from Figure 14

10.17182/hepdata.93013.v1/t25

Ratio of prompt Ds+ over D+ production cross section as a function of the charged particle pseudorapidity density in p-Pb...

• #### Ds+/D+ ratio vs DN/DETA(NCH), PT(D) 8 TO 12, Figure 14

Data from Figure 14

10.17182/hepdata.93013.v1/t26

Ratio of prompt Ds+ over D+ production cross section as a function of the charged particle pseudorapidity density in p-Pb...

• #### Ds+/D+ ratio vs DN/DETA(NCH), PT(D) 12 TO 16, Figure 14

Data from Figure 14

10.17182/hepdata.93013.v1/t27

Ratio of prompt Ds+ over D+ production cross section as a function of the charged particle pseudorapidity density in p-Pb...