Inclusive, prompt and non-prompt J/ψ production at midrapidity in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV
抄録
<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A measurement of inclusive, prompt, and non-prompt J/<jats:italic>ψ</jats:italic> production in p-Pb collisions at a nucleon-nucleon centre-of-mass energy <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 is presented. The inclusive J/<jats:italic>ψ</jats:italic> mesons are reconstructed in the dielectron decay channel at midrapidity down to a transverse momentum <jats:italic>p</jats:italic><jats:sub>T</jats:sub> = 0. The inclusive J/<jats:italic>ψ</jats:italic> nuclear modification factor <jats:italic>R</jats:italic><jats:sub>pPb</jats:sub> is calculated by comparing the new results in p-Pb collisions to a recently measured proton-proton reference at the same centre-of-mass energy. Non-prompt J/<jats:italic>ψ</jats:italic> mesons, which originate from the decay of beauty hadrons, are separated from promptly produced J/<jats:italic>ψ</jats:italic> on a statistical basis for <jats:italic>p</jats:italic><jats:sub>T</jats:sub> larger than 1.0 GeV/<jats:italic>c</jats:italic>. These results are based on the data sample collected by the ALICE detector during the 2016 LHC p-Pb run, corresponding to an integrated luminosity <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \mathcal{L} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>L</mml:mi> </mml:math></jats:alternatives></jats:inline-formula><jats:sub>int</jats:sub> = 292 <jats:italic>±</jats:italic> 11 <jats:italic>μ</jats:italic>b<jats:sup><jats:italic>−</jats:italic>1</jats:sup>, which is six times larger than the previous publications. The total uncertainty on the <jats:italic>p</jats:italic><jats:sub>T</jats:sub>-integrated inclusive J/<jats:italic>ψ</jats:italic> and non-prompt J/<jats:italic>ψ</jats:italic> cross section are reduced by a factor 1.7 and 2.2, respectively. The measured cross sections and <jats:italic>R</jats:italic><jats:sub>pPb</jats:sub> are compared with theoretical models that include various combinations of cold nuclear matter effects. From the non-prompt J/<jats:italic>ψ</jats:italic> production cross section, the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \mathrm{b}\overline{\mathrm{b}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>b</mml:mi> <mml:mover> <mml:mi>b</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula> production cross section at midrapidity, <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\mathrm{d}\sigma}_{\mathrm{b}\overline{\mathrm{b}}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mrow> <mml:mi>d</mml:mi> <mml:mi>σ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>b</mml:mi> <mml:mover> <mml:mi>b</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:mrow> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula><jats:italic>/</jats:italic>d<jats:italic>y</jats:italic>, and the total cross section extrapolated over full phase space, <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\sigma}_{\mathrm{b}\overline{\mathrm{b}}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>σ</mml:mi> <mml:mrow> <mml:mi>b</mml:mi> <mml:mover> <mml:mi>b</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:mrow> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula>, are derived.</jats:p>
収録刊行物
-
- Journal of High Energy Physics
-
Journal of High Energy Physics 2022 (6), 2022-06-03
Springer Science and Business Media LLC