Measurement of prompt D0, D+, D*+, and $$ {\mathrm{D}}_{\mathrm{S}}^{+} $$ production in p–Pb collisions at $$ \sqrt{{\mathrm{s}}_{\mathrm{NN}}} $$ = 5.02 TeV
抄録
<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>The measurement of the production of prompt D<jats:sup>0</jats:sup>, D<jats:sup>+</jats:sup>, D<jats:sup>*+</jats:sup>, and <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {\mathrm{D}}_{\mathrm{S}}^{+} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mi>S</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> </jats:alternatives> </jats:inline-formula> mesons in proton–lead (p–Pb) collisions at the centre-of-mass energy per nucleon pair of <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \sqrt{s_{\mathrm{NN}}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> </mml:math> </jats:alternatives> </jats:inline-formula> = 5<jats:italic>.</jats:italic>02 TeV, with an integrated luminosity of 292 ± 11 <jats:italic>μ</jats:italic>b<jats:sup> <jats:italic>−</jats:italic>1</jats:sup>, are reported. Differential production cross sections are measured at mid-rapidity (<jats:italic>−</jats:italic>0<jats:italic>.</jats:italic>96 <jats:italic>< y</jats:italic> <jats:sub>cms</jats:sub> <jats:italic><</jats:italic> 0<jats:italic>.</jats:italic>04) as a function of transverse momentum (<jats:italic>p</jats:italic> <jats:sub>T</jats:sub>) in the intervals 0 <jats:italic>< p</jats:italic> <jats:sub>T</jats:sub> <jats:italic><</jats:italic> 36 GeV<jats:italic>/c</jats:italic> for D<jats:sup>0</jats:sup>, 1 <jats:italic>< p</jats:italic> <jats:sub>T</jats:sub> <jats:italic><</jats:italic> 36 GeV<jats:italic>/c</jats:italic> for D<jats:sup>+</jats:sup> and D<jats:sup>*+</jats:sup>, and 2 <jats:italic>< p</jats:italic> <jats:sub>T</jats:sub> <jats:italic><</jats:italic> 24 GeV<jats:italic>/c</jats:italic> for D<jats:sup>+</jats:sup> mesons. For each species, the nuclear modification factor <jats:italic>R</jats:italic> <jats:sub>pPb</jats:sub> is calculated as a function of <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> using a proton-proton (pp) ref- erence measured at the same collision energy. The results are compatible with unity in the whole <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> range. The average of the non-strange D mesons <jats:italic>R</jats:italic> <jats:sub>pPb</jats:sub> is compared with theoretical model predictions that include initial-state effects and parton transport model predictions. The <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> dependence of the D<jats:sup>0</jats:sup>, D<jats:sup>+</jats:sup>, and D<jats:sup>*+</jats:sup> nuclear modification factors is also reported in the interval 1 <jats:italic>< p</jats:italic> <jats:sub>T</jats:sub> <jats:italic><</jats:italic> 36 GeV<jats:italic>/c</jats:italic> as a function of the collision centrality, and the central-to-peripheral ratios are computed from the D-meson yields measured in different centrality classes. The results are further compared with charged-particle measurements and a similar trend is observed in all the centrality classes. The ratios of the <jats:italic>p</jats:italic> <jats:sub>T</jats:sub>-differential cross sections of D<jats:sup>0</jats:sup>, D<jats:sup>+</jats:sup>, D<jats:sup>*+</jats:sup>, and <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {\mathrm{D}}_{\mathrm{S}}^{+} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mi>S</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> </jats:alternatives> </jats:inline-formula> mesons are also reported. The <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ {\mathrm{D}}_{\mathrm{S}}^{+} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mi>S</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> </jats:alternatives> </jats:inline-formula> and D<jats:sup>+</jats:sup> yields are compared as a function of the charged-particle multiplicity for several <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> intervals. No modification in the relative abundances of the four species is observed with respect to pp collisions within the statistical and systematic uncertainties.</jats:p>
収録刊行物
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- Journal of High Energy Physics
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Journal of High Energy Physics 2019 (12), 2019-12
Springer Science and Business Media LLC