The production of J/$\psi$ mesons is studied in proton-lead collisions at the centre-of-mass energy per nucleon pair $\sqrt{s_{\text{NN}}}=8.16$ TeV with the LHCb detector at the LHC. The double differential cross-sections of prompt and nonprompt J/$\psi$ production are measured as functions of the J/$\psi$ transverse momentum and rapidity in the nucleon-nucleon centre-of-mass frame. Forward-to-backward ratios and nuclear modification factors are determined. The results are compared with theoretical calculations based on collinear factorisation using nuclear parton distribution functions, on the colour glass condensate or on coherent energy loss models.
(left) Invariant mass and (right) pseudo proper time distributions for $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ candidates in the bin $6< p_{\mathrm{ T}} <7 {\mathrm{ Ge V /}c} $ and $3.5<|y^*|<4.0$ for the (top) $p$Pb and (bottom) Pb$p$ samples respectively. The black circles with error bars represent the LHCb data. The projection of the result of the fit described in the text is drawn on each distribution: the red solid line is the total fit function, the blue dashed line is the prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ signal component, the purple solid line is the $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons signal component and the green dashed line is the combinatorial background component. |
pPb_ma[..].pdf [19 KiB] HiDef png [314 KiB] Thumbnail [260 KiB] *.C file |
|
pPb_tZ_pub.pdf [21 KiB] HiDef png [255 KiB] Thumbnail [196 KiB] *.C file |
||
Pbp_ma[..].pdf [19 KiB] HiDef png [309 KiB] Thumbnail [251 KiB] *.C file |
||
Pbp_tZ_pub.pdf [21 KiB] HiDef png [274 KiB] Thumbnail [204 KiB] *.C file |
||
Total $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ detection efficiency, $\epsilon_{\text{tot}}$, as a function of the $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ $p_{\mathrm{ T}}$ in different $y^*$ bins for (left) $p$Pb and (right) Pb$p$. |
eff_to[..].pdf [229 KiB] HiDef png [232 KiB] Thumbnail [229 KiB] *.C file |
|
eff_to[..].pdf [229 KiB] HiDef png [270 KiB] Thumbnail [247 KiB] *.C file |
||
Production cross-section for (top left) prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ in $p$Pb, (top right) $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons in $p$Pb, (bottom left) prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ in Pb$p$ and (bottom right) $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons in Pb$p$. The data points are placed at the centre of the $p_{\mathrm{ T}}$ bins, the horizontal error bars indicate the bin widths and the vertical error bars the total uncertainties, calculated as quadratic sums of the statistical and systematic uncertainties. |
crosss[..].pdf [229 KiB] HiDef png [231 KiB] Thumbnail [226 KiB] *.C file |
|
crosss[..].pdf [229 KiB] HiDef png [238 KiB] Thumbnail [235 KiB] *.C file |
||
crosss[..].pdf [229 KiB] HiDef png [258 KiB] Thumbnail [244 KiB] *.C file |
||
crosss[..].pdf [229 KiB] HiDef png [268 KiB] Thumbnail [253 KiB] *.C file |
||
Fraction of $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons, $f_b$, as a function of $p_{\mathrm{ T}}$ for (from top to bottom) $1.5<|y^*|<2.0$, $2.0<|y^*|<2.5$, $2.5<|y^*|<3.0$, $3.0<|y^*|<3.5$, $3.5<|y^*|<4.0$, $4.0<|y^*|<4.5$ and $4.5<|y^*|<5.0$. The data points are placed at the centre of the $p_{\mathrm{ T}}$ bins, the horizontal error bars indicate the bin widths and the vertical error bars the total uncertainties, calculated as quadratic sums of the statistical and systematic uncertainties. Blue circles are for $p$Pb collisions, red squares for Pb$p$ collisions and black triangles for $pp$ collisions at $8 {\rm TeV}$ taken from Ref. [64]. |
bfraction.pdf [242 KiB] Thumbnail [400 KiB] *.C file |
|
Absolute production cross-sections of (left) prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ and (right) $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons, as a function of $y^*$, integrated over the range $0< p_{\mathrm{ T}} <14 {\mathrm{ Ge V /}c} $. The black circles are the $p$Pb and Pb$p$ values and the red open squares the values for $pp$ collisions at the same energy, multiplied by the Pb mass number $A=208$. The horizontal error bars are the bin widths and vertical error bars the total uncertainties. |
crosss[..].pdf [226 KiB] HiDef png [175 KiB] Thumbnail [171 KiB] *.C file |
|
crosss[..].pdf [226 KiB] HiDef png [173 KiB] Thumbnail [165 KiB] *.C file |
||
Absolute production cross-sections of (top left) prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ in $p$Pb, (top right) prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ in Pb$p$, (bottom left) $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons in Pb$p$ and (bottom left) $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons in Pb$p$, as a function of $ p_{\mathrm{ T}} $ and integrated over the rapidity range of the analysis. The black circles are the $p$Pb and Pb$p$ values and the red open squares the values for $pp$ collisions at the same energy, multiplied by the Pb mass number $A=208$, integrated over the same rapidity ranges. The horizontal error bars are the bin widths and vertical error bars the total uncertainties. |
crosss[..].pdf [227 KiB] HiDef png [184 KiB] Thumbnail [185 KiB] *.C file |
|
crosss[..].pdf [227 KiB] HiDef png [183 KiB] Thumbnail [180 KiB] *.C file |
||
crosss[..].pdf [227 KiB] HiDef png [191 KiB] Thumbnail [188 KiB] *.C file |
||
crosss[..].pdf [227 KiB] HiDef png [190 KiB] Thumbnail [184 KiB] *.C file |
||
$ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ nuclear modification factor, $R_{p{\rm Pb}}$, integrated over $y^*$ in the analysis range, as a function of $p_{\mathrm{ T}}$ for (top left) prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ in $p$Pb, (bottom left) $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons in $p$Pb, (top right) prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ in Pb$p$ and (bottom right) $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons in Pb$p$. Horizontal error bars are the bin widths, vertical error bars the total uncertainties. The black circles are the values measured in this letter and the coloured areas the theoretical predictions from the models detailed in the text with their uncertainties. |
nuclea[..].pdf [229 KiB] HiDef png [691 KiB] Thumbnail [426 KiB] *.C file |
|
nuclea[..].pdf [229 KiB] HiDef png [586 KiB] Thumbnail [363 KiB] *.C file |
||
nuclea[..].pdf [226 KiB] HiDef png [239 KiB] Thumbnail [201 KiB] *.C file |
||
nuclea[..].pdf [226 KiB] HiDef png [228 KiB] Thumbnail [200 KiB] *.C file |
||
$ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ nuclear modification factor, $R_{p{\rm Pb}}$, integrated over $p_{\mathrm{ T}}$ in the range $0< p_{\mathrm{ T}} <14 {\mathrm{ Ge V /}c} $, as a function of $y^*$ for (left) prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ and (right) $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons. The horizontal error bars are the bin widths and vertical error bars the total uncertainties. The black circles are the values measured in this letter, the red squares the values measured at $\sqrt{s_{NN}}=5 {\rm TeV}$ from Ref. [27] and the coloured areas the theoretical computations from the models detailed in the text, with their uncertainties. |
nuclea[..].pdf [229 KiB] HiDef png [792 KiB] Thumbnail [443 KiB] *.C file |
|
nuclea[..].pdf [226 KiB] HiDef png [267 KiB] Thumbnail [209 KiB] *.C file |
||
Forward-to-backward ratios, $R_{{\rm FB}}$, integrated over the common rapidity range $2.5<|y^*|<4.0$ as a function of $p_{\mathrm{ T}}$ for (left) prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ and (right) $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons. The horizontal error bars are the bin widths and the vertical error bars the total uncertainties. The black circles are the values measured in this letter, the red squares the values measured at $\sqrt{s_{NN}}=5 {\rm TeV}$ from Ref. [27] and the coloured areas the theoretical computations from the models detailed in the text, with their uncertainties. |
forwar[..].pdf [228 KiB] HiDef png [698 KiB] Thumbnail [446 KiB] *.C file |
|
forwar[..].pdf [226 KiB] HiDef png [187 KiB] Thumbnail [189 KiB] *.C file |
||
Forward-to-backward ratios, $R_{{\rm FB}}$, integrated over $p_{\mathrm{ T}}$ in the range $0< p_{\mathrm{ T}} <14 {\mathrm{ Ge V /}c} $ as a function of $|y^{*}|$ for (left) prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ and (right) $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons. The horizontal error bars are the bin widths and the vertical error bars the total uncertainties. The black circles are the values measured in this letter, the red squares the values measured at $\sqrt{s_{NN}}=5 {\rm TeV}$ from Ref. [27] and the coloured areas the theoretical computations from the models detailed in the text, with their uncertainties. |
forwar[..].pdf [228 KiB] HiDef png [618 KiB] Thumbnail [380 KiB] *.C file |
|
forwar[..].pdf [225 KiB] HiDef png [148 KiB] Thumbnail [147 KiB] *.C file |
||
Animated gif made out of all figures. |
PAPER-2017-014.gif Thumbnail |
Summary of relative systematic uncertainties in $p$Pb and Pb$p$ on the cross-section of prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ and $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons. Uncertainties that are computed bin-by-bin are expressed as ranges giving the minimum to maximum values. The last column indicates the correlation between bins within the same beam configuration. |
Table_1.pdf [48 KiB] HiDef png [101 KiB] Thumbnail [45 KiB] tex code |
|
Prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ absolute production cross-section in $p$Pb, as a function of $p_{\mathrm{ T}}$ and $y^*$. The quoted uncertainties are the total uncertainties, and the breakdown into statistical uncertainties, and correlated and uncorrelated systematic uncertainties. |
Table_2.pdf [66 KiB] HiDef png [333 KiB] Thumbnail [154 KiB] tex code |
|
Prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ absolute production cross-section in $p$Pb, as a function of $p_{\mathrm{ T}}$ and $y^*$. The quoted uncertainties are the total uncertainties, and the breakdown into statistical uncertainties, and correlated and uncorrelated systematic uncertainties. |
Table_3.pdf [66 KiB] HiDef png [292 KiB] Thumbnail [134 KiB] tex code |
|
$ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons absolute production cross-section in $p$Pb, as a function of $p_{\mathrm{ T}}$ and $y^*$. The quoted uncertainties are the total uncertainties, and the breakdown into statistical uncertainties, and correlated and uncorrelated systematic uncertainties. |
Table_4.pdf [66 KiB] HiDef png [311 KiB] Thumbnail [140 KiB] tex code |
|
$ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons absolute production cross-section in $p$Pb, as a function of $p_{\mathrm{ T}}$ and $y^*$. The quoted uncertainties are the total uncertainties, and the breakdown into statistical uncertainties, and correlated and uncorrelated systematic uncertainties. |
Table_5.pdf [66 KiB] HiDef png [272 KiB] Thumbnail [129 KiB] tex code |
|
Prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ absolute production cross-section in Pb$p$, as a function of $p_{\mathrm{ T}}$ and $y^*$. The quoted uncertainties are the total uncertainties, and the breakdown into statistical uncertainties, and correlated and uncorrelated systematic uncertainties. |
Table_6.pdf [66 KiB] HiDef png [327 KiB] Thumbnail [144 KiB] tex code |
|
Prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ absolute production cross-section in Pb$p$, as a function of $p_{\mathrm{ T}}$ and $y^*$. The quoted uncertainties are the total uncertainties, and the breakdown into statistical uncertainties, and correlated and uncorrelated systematic uncertainties. |
Table_7.pdf [66 KiB] HiDef png [274 KiB] Thumbnail [124 KiB] tex code |
|
$ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons absolute production cross-section in Pb$p$, as a function of $p_{\mathrm{ T}}$ and $y^*$. The quoted uncertainties are the total uncertainties, and the breakdown into statistical uncertainties, and correlated and uncorrelated systematic uncertainties. |
Table_8.pdf [66 KiB] HiDef png [293 KiB] Thumbnail [133 KiB] tex code |
|
$ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons absolute production cross-section in Pb$p$, as a function of $p_{\mathrm{ T}}$ and $y^*$. The quoted uncertainties are the total uncertainties, and the breakdown into statistical uncertainties, and correlated and uncorrelated systematic uncertainties. |
Table_9.pdf [66 KiB] HiDef png [249 KiB] Thumbnail [122 KiB] tex code |
|
Fraction of $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons, $f_b$, in $p$Pb in bins of $p_{\mathrm{ T}}$ and $y^*$. The uncertainty is the quadratic sum of statistical and systematic uncertainties. |
Table_10.pdf [49 KiB] HiDef png [330 KiB] Thumbnail [165 KiB] tex code |
|
Fraction of $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons, $f_b$, in $p$Pb in bins of $p_{\mathrm{ T}}$ and $y^*$. The uncertainty is the quadratic sum of statistical and systematic uncertainties. |
Table_11.pdf [49 KiB] HiDef png [358 KiB] Thumbnail [175 KiB] tex code |
|
Fraction of $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons, $f_b$, in Pb$p$ in bins of $p_{\mathrm{ T}}$ and $y^*$. The uncertainty is the quadratic sum of statistical and systematic uncertainties. |
Table_12.pdf [49 KiB] HiDef png [304 KiB] Thumbnail [157 KiB] tex code |
|
Fraction of $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons, $f_b$, in Pb$p$ in bins of $p_{\mathrm{ T}}$ and $y^*$. The uncertainty is the quadratic sum of statistical and systematic uncertainties. |
Table_13.pdf [49 KiB] HiDef png [322 KiB] Thumbnail [164 KiB] tex code |
|
Prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ nuclear modification factor, $R_{p{\rm Pb}}$, in $p$Pb and Pb$p$ as a function of $p_{\mathrm{ T}}$ integrated over $y^*$ in the range $1.5<y^*<4.0$ for $p$Pb and $-5.0<y^*<-2.5$ for Pb$p$. The quoted uncertainties are the quadratic sums of statistical and systematic uncertainties. |
Table_14.pdf [42 KiB] HiDef png [194 KiB] Thumbnail [91 KiB] tex code |
|
Prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ nuclear modification factor, $R_{p{\rm Pb}}$, in $p$Pb and Pb$p$ as a function of $y^*$ integrated over $p_{\mathrm{ T}}$ in the range $0< p_{\mathrm{ T}} <14 {\mathrm{ Ge V /}c} $. The quoted uncertainties are the quadratic sums of statistical and systematic uncertainties. |
Table_15.pdf [48 KiB] HiDef png [209 KiB] Thumbnail [83 KiB] tex code |
|
$ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons nuclear modification factor, $R_{p{\rm Pb}}$, in $p$Pb and Pb$p$ as a function of $p_{\mathrm{ T}}$ integrated over $y^*$ in the range $1.5<y^*<4.0$ for $p$Pb and $-5.0<y^*<-2.5$ for Pb$p$. The quoted uncertainties are the quadratic sums of statistical and systematic uncertainties. |
Table_16.pdf [42 KiB] HiDef png [190 KiB] Thumbnail [89 KiB] tex code |
|
$ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons nuclear modification factor, $R_{p{\rm Pb}}$, in $p$Pb as a function of $y^*$ integrated over $p_{\mathrm{ T}}$ in the range $0< p_{\mathrm{ T}} <14 {\mathrm{ Ge V /}c} $. The quoted uncertainties are the quadratic sums of statistical and systematic uncertainties. |
Table_17.pdf [47 KiB] HiDef png [202 KiB] Thumbnail [82 KiB] tex code |
|
Prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ forward-to-backward ratio, $R_{{\rm FB}}$, as a function of $p_{\mathrm{ T}}$ integrated over $|y^*|$ in the range $2.5<|y^*|<4.0$. The quoted uncertainties are the quadratic sums of statistical and systematic uncertainties. |
Table_18.pdf [35 KiB] HiDef png [291 KiB] Thumbnail [118 KiB] tex code |
|
Prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ forward-to-backward ratio, $R_{{\rm FB}}$, as a function of $y^*$ integrated over $p_{\mathrm{ T}}$ in the range $0< p_{\mathrm{ T}} <14 {\mathrm{ Ge V /}c} $. The quoted uncertainties are the quadratic sums of statistical and systematic uncertainties. |
Table_19.pdf [40 KiB] HiDef png [95 KiB] Thumbnail [36 KiB] tex code |
|
$ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons forward-to-backward ratio, $R_{{\rm FB}}$, as a function of $p_{\mathrm{ T}}$ integrated over $|y^*|$ in the range $2.5<|y^*|<4.0$. The quoted uncertainties are the quadratic sums of statistical and systematic uncertainties. |
Table_20.pdf [35 KiB] HiDef png [289 KiB] Thumbnail [117 KiB] tex code |
|
$ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu}$ -from-$b$-hadrons forward-to-backward ratio, $R_{{\rm FB}}$, as a function of $y^*$ integrated over $p_{\mathrm{ T}}$ in the range $0< p_{\mathrm{ T}} <14 {\mathrm{ Ge V /}c} $. The quoted uncertainties are the quadratic sums of statistical and systematic uncertainties. |
Table_21.pdf [40 KiB] HiDef png [94 KiB] Thumbnail [36 KiB] tex code |
Created on 27 April 2024.