Production of prompt D$^0$ mesons is studied in protonlead and leadproton 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 nucleonnucleon centreofmass energy of $\sqrt{s}=5$ TeV. Measurements of the differential crosssection, the forwardbackward 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 nucleonnucleon centreofmass system.
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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Doubledifferential crosssection $\frac{\mathrm{d}^2\sigma}{\mathrm{d} p_{\mathrm T}\mathrm{d} y^*}$ (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 crosssection 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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Forwardbackward 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 forwardbackward 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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Animated gif made out of all figures. 
PAPER2017015.gif Thumbnail 
Summary of systematic and statistical uncertainties on the crosssection. The ranges indicate the variations between bins, with the uncertainty on average increasing with rapidity and momentum. 
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Doubledifferential crosssection $\frac{\mathrm{d}^2\sigma}{\mathrm{d} p_{\mathrm T}\mathrm{d} y^*}$ (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 crosssection $\frac{\mathrm{d}\sigma}{\mathrm{d} p_{\mathrm T}}$ (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 crosssection $\frac{\mathrm{d}\sigma}{\mathrm{d} y^*}$ (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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Forwardbackward 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 full pdf 
supple[..].pdf [56 KiB] 

This is the supplementary material for the paper LHCbPAPER2017015, 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 17 August 2019.Citation count from INSPIRE on 23 August 2019.