Measurement of differential J/psi production cross sections and forward-backward ratios in p plus Pb collisions with the ATLAS detector [Elektronisk resurs]

<p>ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevC.92.034904</p>
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Measurements of differential cross sections for J/psi production in p + Pb collisions at root S-NN= 5.02 TeV at the CERN Large Hadron Collider with the ATLAS detector are presented. The data set used corresponds to an integrated luminosity of 28.1 nb(-1). The J/psi mesons are reconstructed in the dimuon decay channel over the transverse momentum range 8 < PT < 30 GeV and over the center-of-mass rapidity range -2.87 < y* < 1.94. Prompt J/psi are separated from J/psi resulting from b-hadron decays through an analysis of the distance between the J/psi decay vertex and the event primary vertex. The differential cross section for production of nonprompt J/psi is compared to a FONLL calculation that does not include nuclear effects. Forward-backward production ratios are presented and compared to theoretical predictions. These results complement previously published results by covering a region of higher transverse momentum and more central rapidity. They thus constrain the kinematic dependence of nuclear modifications of charmonium and b-quark production in p + Pb collisions.

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Fler titlar av: Aad, G.; Bergeås, Elin Kuutma ...; Brenner, Richard; Buszello, Claus P.; Ekelöf, Tord; Ellert, Mattias; visa fler...; Ferrari, Arnaud; Isaksson, Charlie; Madsen, Alexander; Öhman, Henrik; Pelikan, Daniel; Rangel-Smith, Camill ...; Zwalinski, L.; Uppsala universitet ...; visa färre...
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