{"title":"Charm fragmentation fractions and ${\\rm c\\overline{c}}$ cross section in p$-$Pb collisions at $\\sqrt{s_{\\rm NN}}=5.02$ TeV","authors":"ALICE Collaboration","doi":"arxiv-2405.14571","DOIUrl":null,"url":null,"abstract":"The total charm-quark production cross section per unit of rapidity\n$\\mathrm{d}\\sigma({\\rm c\\overline{c}})/\\mathrm{d}y$, and the fragmentation\nfractions of charm quarks to different charm-hadron species\n$f(\\mathrm{c}\\rightarrow {\\rm h_{c}})$, are measured for the first time in\np$-$Pb collisions at $\\sqrt{s_\\mathrm{NN}} = 5.02$ TeV at midrapidity\n($-0.96<y<0.04$ in the centre-of-mass frame) using data collected by ALICE at\nthe CERN LHC. The results are obtained based on all the available measurements\nof prompt production of ground-state charm-hadron species: $\\mathrm{D}^{0}$,\n$\\mathrm{D}^{+}$, $\\mathrm{D}_\\mathrm{s}^{+}$, and $\\mathrm{J/\\psi}$ mesons,\nand $\\Lambda_\\mathrm{c}^{+}$ and $\\Xi_{\\rm c}^{0}$ baryons. The resulting cross\nsection is $\\mathrm{d}\\sigma({\\rm c\\overline{c}})/\\mathrm{d}y =219.6 \\pm\n6.3\\;(\\mathrm{stat.}) {\\;}_{-11.8}^{+10.5}\\;(\\mathrm{syst.})\n{\\;}_{-2.9}^{+7.6}\\;(\\mathrm{extr.})\\pm 5.4\\;(\\mathrm{BR})\\pm\n4.6\\;(\\mathrm{lumi.}) \\pm 19.5\\;(\\text{rapidity shape})+15.0\\;(\\Omega_{\\rm\nc}^{0})$ mb, which is consistent with a binary scaling of pQCD calculations\nfrom pp collisions. The measured fragmentation fractions are compatible with\nthose measured in pp collisions at $\\sqrt{s} = 5.02$ and $13$ TeV, showing an\nincrease in the relative production rates of charm baryons with respect to\ncharm mesons in pp and p$-$Pb collisions compared with $\\mathrm{e^{+}e^{-}}$\nand $\\mathrm{e^{-}p}$ collisions. The $p_\\mathrm{T}$-integrated nuclear\nmodification factor of charm quarks, $R_\\mathrm{pPb}({\\rm c\\overline{c}})= 0.91\n\\pm 0.04\\;{\\rm (stat.)}{}^{+0.08}_{-0.09}\\;{\\rm\n(syst.)}{}^{+0.04}_{-0.03}\\;{\\rm (extr.)}{}\\pm 0.03\\;{\\rm (lumi.)}$, is found\nto be consistent with unity and with theoretical predictions including nuclear\nmodifications of the parton distribution functions.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Nuclear Experiment","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2405.14571","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The total charm-quark production cross section per unit of rapidity
$\mathrm{d}\sigma({\rm c\overline{c}})/\mathrm{d}y$, and the fragmentation
fractions of charm quarks to different charm-hadron species
$f(\mathrm{c}\rightarrow {\rm h_{c}})$, are measured for the first time in
p$-$Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV at midrapidity
($-0.96