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Study of prompt D$^0$ meson production in pPb collisions at $\sqrt{s}$=5 TeV

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Abstract

Production of prompt D$^0$ mesons is studied in proton-lead and lead-proton collisions recorded at the LHCb detector at the LHC. The data sample corresponds to an integrated luminosity of $1.58\pm0.02$ nb$^{-1}$ recorded at a nucleon-nucleon centre-of-mass energy of $\sqrt{s}=5$ TeV. Measurements of the differential cross-section, the forward-backward production ratio and the nuclear modification factor are reported using D$^0$ candidates with transverse momenta less than 10 GeV/c and rapidities in the ranges $1.5<y^*<4.0$ and $-5.0<y^*<-2.5$ in the nucleon-nucleon centre-of-mass system.

Figures and captions

The (left) $M(K^\mp\pi^\pm)$ and (right) $\log_{10}(\chi^2_{\text{\rm IP}} ( D ^0 )) $ distributions and the fit result for the inclusive $ D ^0 $ mesons in the forward data sample in the kinematic range of $2< p_{\mathrm{ T}} <3 {\mathrm{ Ge V /}c} $ and $2.5<y^*<3.0$.

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The (left) $M(K^\mp\pi^\pm)$ and (right) $\log_{10}(\chi^2_{\text{\rm IP}} ( D ^0 )) $ distributions and the fit result for the inclusive $ D ^0 $ mesons in the backward data sample in the kinematic range of $2< p_{\mathrm{ T}} <3 {\mathrm{ Ge V /}c} $ and $-4.0<y^*<-3.5$.

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Double-differential cross-section $\frac{\mathrm{d}^2\sigma}{\mathrm{d} p_{\mathrm T}\mathrm{d} y^*}$ (mb/( $ {\mathrm{ Ge V /}c}$ )) of prompt $ D ^0 $ meson production in $ p\mathrm{Pb} $ collisions in the (left) forward and (right) backward collision samples. The uncertainty is the quadratic sum of the statistical and systematic components.

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Differential cross-section of prompt $ D ^0 $ meson production in $ p\mathrm{Pb} $ collisions as a function of (left) $ p_{\mathrm{ T}} $ ($\frac{\mathrm{d}\sigma}{\mathrm{d} p_{\rm T}}$) and (right) $y^{*}$ ($\frac{\mathrm{d}\sigma}{\mathrm{d} y^*}$) in the forward and backward collision samples. The uncertainty is the quadratic sum of the statistical and systematic components. The measurements are compared with theoretical predictions including different nuclear parton distribution functions as explained in the text.

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Nuclear modification factor $R_{ p\mathrm{Pb} }$ as a function of $ p_{\mathrm{ T}} $ for prompt $ D ^0 $ meson production in the (left) backward data and (right) forward data, integrated over the common rapidity range $2.5<|y^{*}|<4.0$ for $ p_{\mathrm{ T}} <6 {\mathrm{ Ge V /}c} $ and over $2.5<|y^{*}|<3.5$ for $6< p_{\mathrm{ T}} <10 {\mathrm{ Ge V /}c} $. The uncertainty is the quadratic sum of the statistical and systematic components. The CGC predictions are only available for the forward region.

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Nuclear modification factor $R_{ p\mathrm{Pb} }$ as a function of $y^*$ for prompt $ D ^0 $ meson production, integrated up to $ p_{\mathrm{ T}} =10 {\mathrm{ Ge V /}c} $. The uncertainty is the quadratic sum of the statistical and systematic components.

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Ratio of nuclear modification factors $R_{ p\mathrm{Pb} }$ of $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} $ and $\psi {(2S)} $ to $ D ^0 $ mesons in bins of rapidity integrated up to $ p_{\mathrm{ T}} =10 {\mathrm{ Ge V /}c} $ in the common rapidity range $2.5<|y^{*}|<4.0$. The uncertainty is the quadratic sum of the statistical and systematic components.

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Forward-backward ratio $R_\mathrm{FB}$ for prompt $ D ^0 $ meson production (left) as a function of $ p_{\mathrm{ T}} $ integrated over the common rapidity range $2.5<|y^{*}|<4.0$ for $ p_{\mathrm{ T}} <6 {\mathrm{ Ge V /}c} $ and over $2.5<|y^{*}|<3.5$ for $6< p_{\mathrm{ T}} <10 {\mathrm{ Ge V /}c} $; (right) as a function of $y^*$ integrated up to $ p_{\mathrm{ T}} =10 {\mathrm{ Ge V /}c} $. The uncertainty is the quadratic sum of the statistical and systematic components.

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Relative forward-backward production ratio $R_\mathrm{FB}$ for prompt $ D ^0 $ mesons over that for prompt $ { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} $ mesons (left) as a function of $ p_{\mathrm{ T}} $ integrated over the common rapidity range $2.5<|y^{*}|<4.0$ for $ p_{\mathrm{ T}} <6 {\mathrm{ Ge V /}c} $ and over $2.5<|y^{*}|<3.5$ for $6< p_{\mathrm{ T}} <10 {\mathrm{ Ge V /}c} $; (right) as a function of $y^*$ integrated up to $ p_{\mathrm{ T}} =10 {\mathrm{ Ge V /}c} $. The red inner bars in the uncertainty represent the statistical uncertainty and the black outer bars the quadratic sum of the statistical and systematic components.

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Tables and captions

Summary of systematic and statistical uncertainties on the cross-section. The ranges indicate the variations between bins, with the uncertainty on average increasing with rapidity and momentum.

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Double-differential cross-section $\frac{\mathrm{d}^2\sigma}{\mathrm{d} p_{\mathrm T}\mathrm{d} y^*}$ (mb/( $ {\mathrm{ Ge V /}c}$ )) for prompt $ D ^0 $ meson production as functions of $ p_{\mathrm{ T}} $ and $y^{*}$ in $ p\mathrm{Pb} $ forward and backward data, respectively. The first uncertainty is statistical, the second is the component of the systematic uncertainty that is uncorrelated between bins and the third is the correlated component. In the regions with no entries the signal is not statistically significant.

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Measured differential cross-section $\frac{\mathrm{d}\sigma}{\mathrm{d} p_{\mathrm T}}$ (mb/( $ {\mathrm{ Ge V /}c}$ )) for prompt $ D ^0 $ meson production as a function of $ p_{\mathrm{ T}} $ in $ p\mathrm{Pb} $ forward and backward data, respectively. The first uncertainty is statistical, the second is the component of the systematic uncertainty that is uncorrelated between bins and the third is the correlated component. The results in the last two columns are integrated over the common rapidity range $2.5<|y^{*}|<4.0$ for $ p_{\mathrm{ T}} <6 {\mathrm{ Ge V /}c} $ and over $2.5<|y^{*}|<3.5$ for $6< p_{\mathrm{ T}} <10 {\mathrm{ Ge V /}c} $.

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Differential cross-section $\frac{\mathrm{d}\sigma}{\mathrm{d} y^*}$ (mb) for prompt $ D ^0 $ meson production as a function of $|y^{*}|$ in $ p\mathrm{Pb} $ forward and backward data, respectively. The first uncertainty is statistical, the second is the component of the systematic uncertainty that is uncorrelated between bins and the third is the correlated component.

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Nuclear modification factor $R_{ p\mathrm{Pb} }$ for prompt $ D ^0 $ meson production in different $ p_{\mathrm{ T}} $ ranges, integrated over the common rapidity range $2.5<|y^{*}|<4.0$ for $ p_{\mathrm{ T}} <6 {\mathrm{ Ge V /}c} $ and over $2.5<|y^{*}|<3.5$ for $6< p_{\mathrm{ T}} <10 {\mathrm{ Ge V /}c} $ for the forward (positive $y^*$) and backward (negative $y^*$) samples. The first uncertainty is statistical and the second systematic.

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Nuclear modification factor $R_{ p\mathrm{Pb} }$ for prompt $ D ^0 $ meson production in different $y^*$ ranges, integrated up to $ p_{\mathrm{ T}} =10 {\mathrm{ Ge V /}c} $. The first uncertainty is statistical and the second systematic.

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Forward-backward ratio $R_\mathrm{FB}$ for prompt $ D ^0 $ meson production in different $ p_{\mathrm{ T}} $ ranges, integrated over the common rapidity range $2.5<|y^{*}|<4.0$ for $ p_{\mathrm{ T}} <6 {\mathrm{ Ge V /}c} $ and over $2.5<|y^{*}|<3.5$ for $6< p_{\mathrm{ T}} <10 {\mathrm{ Ge V /}c} $, and in different $y^*$ ranges integrated up to $ p_{\mathrm{ T}} =10 {\mathrm{ Ge V /}c} $. The first uncertainty is the statistical and the second is the systematic component.

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Supplementary Material [file]

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This is the supplementary material for the paper LHCb-PAPER-2017-015, Study of prompt Dzero meson production in pPb collisions at sqrt(s)=5 TeV. It includes the following files: Fig10.png Fig10.pdf Fig10.eps Fig10.C supplementary.pdf

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Created on 19 October 2019.