# Prompt $\Lambda^+_c$ production in $p\mathrm{Pb}$ collisions at $\sqrt{s_{NN}} = 5.02$ TeV

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## Abstract

The production of $\Lambda^+_c$ baryons produced directly at the interacting point is studied in proton-lead collisions collected with the LHCb detector at the LHC. The data sample corresponds to an integrated luminosity of $1.58\mathrm{nb}^{-1}$ recorded at a nucleon-nucleon centre-of-mass energy of $\sqrt{s_{NN}}=5.02$ TeV. Measurements of the differential cross-section and the forward-backward production ratio are reported for $\Lambda^+_c$ baryons with transverse momenta in the range $2<p_{T}<10$GeV/$c$ and rapidities in the ranges $1.5<y^*<4.0$ and $-4.5<y^*<-2.5$ in the nucleon-nucleon centre-of-mass system. The ratio of cross-sections of $\Lambda^+_c$ baryons and $D^0$ mesons is also reported. The results are compared with next-to-leading order calculations that use nuclear parton distribution functions.

 Distributions of the invariant mass, $m( p K ^- \pi ^+ )$, in the range $2< p_{\mathrm{ T}} <10 {\mathrm{ Ge V /}c}$ for (a) the forward data sample with $1.5 ## Tables and captions  Systematic and statistical uncertainties for the differential cross-sections. The ranges indicate the variation over the ($ p_{\mathrm{ T}} , y^*$) bins. Table_1.pdf [56 KiB] HiDef png [129 KiB] Thumbnail [66 KiB] tex code Measured differential cross-section (in$\mathrm{ mb} /( {\mathrm{ Ge V /}c} )$) of prompt$\Lambda ^+_ c $baryons as a function of$ p_{\mathrm{ T}} $in$ p\mathrm{Pb} $forward and backward data in different rapidity regions. The right column shows the results for$ p_{\mathrm{ T}} > 7 {\mathrm{ Ge V /}c} $and$2.5<|y^*|<3.5$, which are used to compute the$ R_\mathrm{FB} $values at$ p_{\mathrm{ T}} > 7 {\mathrm{ Ge V /}c} $. The first uncertainties are statistical and the second are systematic. Table_2.pdf [46 KiB] HiDef png [166 KiB] Thumbnail [81 KiB] tex code Differential cross-section (in$\mathrm{ mb} $) for prompt$\Lambda ^+_ c $baryons as a function of$|y^{*}|$in$ p\mathrm{Pb} $forward and backward data. The first uncertainties are statistical and the second are systematic. Table_3.pdf [45 KiB] HiDef png [269 KiB] Thumbnail [113 KiB] tex code Forward-backward prompt$\Lambda ^+_ c $production ratio$ R_\mathrm{FB} $as a function of$ p_{\mathrm{ T}} $in the common range$2.5<|y^*|<4.0$. The first uncertainty is statistical and the second is systematic. Table_5.pdf [35 KiB] HiDef png [178 KiB] Thumbnail [71 KiB] tex code$ R_\mathrm{FB} $ratio as a function of$|y^*|$in the range$2< p_{\mathrm{ T}} <10 {\mathrm{ Ge V /}c} $. The first uncertainty is statistical and the second is systematic. Table_6.pdf [41 KiB] HiDef png [87 KiB] Thumbnail [34 KiB] tex code Production ratio$ R_{\Lambda ^+_ c / D ^0 } $as a function of$ p_{\mathrm{ T}} $in the forward and backward rapidity regions. The first uncertainty is statistical and the second is systematic. Table_7.pdf [44 KiB] HiDef png [277 KiB] Thumbnail [136 KiB] tex code Production ratio$ R_{\Lambda ^+_ c / D ^0 } $as a function of$y^*$for$2< p_{\mathrm{ T}} <10 {\mathrm{ Ge V /}c} \$. The first uncertainty is statistical and the second is systematic. Table_8.pdf [42 KiB] HiDef png [183 KiB] Thumbnail [81 KiB] tex code

Created on 17 August 2019.Citation count from INSPIRE on 20 August 2019.