Measurement of prompt J/ψ and beauty hadron production cross sections at mid-rapidity in pp collisions at $ \sqrt{s}=7 $ TeV

Medientyp: E-Artikel
Titel: Measurement of prompt J/ψ and beauty hadron production cross sections at mid-rapidity in pp collisions at $ \sqrt{s}=7 $ TeV
Beteiligte: Abelev, Betty; Adam, Jaroslav; Adamova, Dagmar; Adare, Andrew Marshall; Aggarwal, Madan; Rinella, Gianluca Aglieri; Agocs, Andras Gabor; Agostinelli, Andrea; Salazar, Saul Aguilar; Ahammed, Zubayer; Ahmad, Arshad; Ahmad, Nazeer; Ahn, Sul-Ah; Ahn, Sang Un; Akindinov, Alexander; Aleksandrov, Dmitry; Alessandro, Bruno; Molina, Jose Ruben Alfaro; Alici, Andrea; Alkin, Anton; Avina, Erick Jonathan Almaraz; Alme, Johan; Alt, Torsten; Altini, Valerio; [...]
Erschienen: Springer Science and Business Media LLC, 2012
Erschienen in: Journal of High Energy Physics
Sprache: Englisch
DOI: 10.1007/jhep11(2012)065
ISSN: 1029-8479
Schlagwörter: Nuclear and High Energy Physics
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Beschreibung: <jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>The ALICE experiment at the LHC has studied J/<jats:italic>ψ</jats:italic> production at mid-rapidity in pp collisions at <jats:inline-formula> <jats:tex-math>$ \sqrt{s}=7 $</jats:tex-math> </jats:inline-formula> TeV through its electron pair decay on a data sample corresponding to an integrated luminosity <jats:italic>L</jats:italic> <jats:sub>int</jats:sub> = 5<jats:italic>.</jats:italic>6 nb<jats:sup>−1</jats:sup>. The fraction of J/<jats:italic>ψ</jats:italic> from the decay of long-lived beauty hadrons was determined for J/<jats:italic>ψ</jats:italic> candidates with transverse momentum <jats:italic>p</jats:italic> <jats:sub>t</jats:sub> <jats:italic>></jats:italic> 1<jats:italic>.</jats:italic>3 GeV/<jats:italic>c</jats:italic> and rapidity |<jats:italic>y</jats:italic>| <jats:italic><</jats:italic> 0<jats:italic>.</jats:italic>9. The cross section for prompt J/<jats:italic>ψ</jats:italic> mesons, i.e. directly produced J/<jats:italic>ψ</jats:italic> and prompt decays of heavier charmonium states such as the <jats:italic>ψ</jats:italic>(2S) and χ<jats:sub>c</jats:sub> resonances, is σ<jats:sub>prompt J/<jats:italic>ψ</jats:italic> </jats:sub> (<jats:italic>p</jats:italic> <jats:sub>t</jats:sub> <jats:italic>></jats:italic> 1<jats:italic>.</jats:italic>3 GeV<jats:italic>/c,</jats:italic> |<jats:italic>y</jats:italic>| <jats:italic><</jats:italic> 0<jats:italic>.</jats:italic>9) = 8<jats:italic>.</jats:italic>3 ± 0<jats:italic>.</jats:italic>8 (stat<jats:italic>.</jats:italic>) ± 1<jats:italic>.</jats:italic>1 (syst<jats:italic>.</jats:italic>) <jats:inline-formula> <jats:tex-math>$ _{-1.4}^{+1.5 } $</jats:tex-math> </jats:inline-formula> (syst<jats:italic>.</jats:italic> pol<jats:italic>.</jats:italic>) <jats:italic>μ</jats:italic>b. The cross section for the production of b-hadrons decaying to J/<jats:italic>ψ</jats:italic> with <jats:italic>p</jats:italic> <jats:sub>t</jats:sub> <jats:italic>></jats:italic> 1<jats:italic>.</jats:italic>3 GeV/<jats:italic>c</jats:italic> and |<jats:italic>y</jats:italic>| <jats:italic><</jats:italic> 0<jats:italic>.</jats:italic>9 is <jats:inline-formula> <jats:tex-math>$ {\sigma_{{{J \left/ {{\psi \leftarrow {{\mathrm{h}}_{\mathrm{B}}}}} \right.}}}} $</jats:tex-math> </jats:inline-formula> (<jats:italic>p</jats:italic> <jats:sub>t</jats:sub> > 1.3 GeV/<jats:italic>c</jats:italic>, |<jats:italic>y</jats:italic>| < 0.9) = 1.46 ± 0.38 (stat.) <jats:inline-formula> <jats:tex-math>$ _{-0.32}^{+0.26 } $</jats:tex-math> </jats:inline-formula> (syst.) <jats:italic>μ</jats:italic>b. The results are compared to QCD model predictions. The shape of the <jats:italic>p</jats:italic> <jats:sub>t</jats:sub> and <jats:italic>y</jats:italic> distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the <jats:inline-formula> <jats:tex-math>$ \mathrm{b}\overline{\mathrm{b}} $</jats:tex-math> </jats:inline-formula> pair total cross section and d<jats:italic>σ/</jats:italic>d<jats:italic>y</jats:italic> at mid-rapidity.</jats:p>

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