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 $2.5<y^*<3.0$. 
Fig1a.pdf [28 KiB] HiDef png [447 KiB] Thumbnail [294 KiB] *.C file 

Fig1b.pdf [33 KiB] HiDef png [348 KiB] Thumbnail [255 KiB] *.C file 

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 $4.0<y^*<3.5$. 
Fig2a.pdf [28 KiB] HiDef png [655 KiB] Thumbnail [356 KiB] *.C file 

Fig2b.pdf [33 KiB] HiDef png [445 KiB] Thumbnail [290 KiB] *.C file 

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. 
Fig3a.pdf [16 KiB] HiDef png [229 KiB] Thumbnail [190 KiB] *.C file 

Fig3b.pdf [16 KiB] HiDef png [206 KiB] Thumbnail [185 KiB] *.C file 

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. 
Fig4a.pdf [18 KiB] HiDef png [356 KiB] Thumbnail [249 KiB] *.C file 

Fig4b.pdf [31 KiB] HiDef png [449 KiB] Thumbnail [266 KiB] *.C file 

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. 
Fig5a.pdf [15 KiB] HiDef png [304 KiB] Thumbnail [208 KiB] *.C file 

Fig5b.pdf [16 KiB] HiDef png [527 KiB] Thumbnail [286 KiB] *.C file 

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. 
Fig6.pdf [27 KiB] HiDef png [452 KiB] Thumbnail [269 KiB] *.C file 

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. 
Fig7.pdf [14 KiB] HiDef png [117 KiB] Thumbnail [103 KiB] *.C file 

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. 
Fig8a.pdf [16 KiB] HiDef png [551 KiB] Thumbnail [311 KiB] *.C file 

Fig8b.pdf [15 KiB] HiDef png [483 KiB] Thumbnail [282 KiB] *.C file 

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. 
Fig9a.pdf [14 KiB] HiDef png [125 KiB] Thumbnail [113 KiB] *.C file 

Fig9b.pdf [13 KiB] HiDef png [102 KiB] Thumbnail [94 KiB] *.C file 

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. 
Table_1.pdf [60 KiB] HiDef png [123 KiB] Thumbnail [55 KiB] tex code 

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. 
Table_2.pdf [46 KiB] HiDef png [569 KiB] Thumbnail [255 KiB] tex code 

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} $. 
Table_3.pdf [46 KiB] HiDef png [169 KiB] Thumbnail [83 KiB] tex code 

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. 
Table_4.pdf [45 KiB] HiDef png [194 KiB] Thumbnail [95 KiB] tex code 

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. 
Table_5.pdf [36 KiB] HiDef png [151 KiB] Thumbnail [78 KiB] tex code 

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. 
Table_6.pdf [47 KiB] HiDef png [148 KiB] Thumbnail [70 KiB] tex code 

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. 
Table_7.pdf [42 KiB] HiDef png [259 KiB] Thumbnail [122 KiB] tex code 
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 
Fig10.pdf [14 KiB] HiDef png [96 KiB] Thumbnail [87 KiB] *C file 
Created on 27 February 2021.