{"title":"在$\\sqrt{s_{\\rm NN}}=5.02$TeV的p$-$Pb对撞中的粲碎片分数和${rm c\\overline{c}}$ 交叉截面","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":"{\"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}","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
摘要
单位快速性的总粲夸克产生截面$/mathrm{d}\sigma({/rm c\overline{c}})/\mathrm{d}y$、首次在p$-$Pb对撞中以$\sqrt{s_\mathrm{NN}} = 5.02$ TeV 的中慢度（在质量中心框架内，$-0.96本文章由计算机程序翻译，如有差异，请以英文原文为准。
Charm fragmentation fractions and ${\rm c\overline{c}}$ cross section in p$-$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV
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
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