Nuclear-Modification Factor for Open-Heavy-Flavor Production at Forward Rapidity in Cu+Cu Collisions at √s_NN=200 GeV

Adare, A.; Awes, Terry C.; Cianciolo, Vince; Efremenko, Yuri V.; Enokizono, Akitomo; Read Jr, Kenneth F.; Silvermyr, David O.; Sorensen, Soren P.; Stankus, Paul W.; Young, Glenn R.; Collaboration, Phenix

doi:10.1103/PhysRevC.86.024909

Title: Nuclear-Modification Factor for Open-Heavy-Flavor Production at Forward Rapidity in Cu+Cu Collisions at √s_NN=200 GeV

Journal Article · Wed Aug 01 00:00:00 EDT 2012 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.86.024909· OSTI ID:1049089

Adare, A. ^[1]; Awes, Terry C. ^[2];

^[2]; Efremenko, Yuri V. ^[2]; Enokizono, Akitomo ^[2];

^[2]; Silvermyr, David O. ^[2];

^[2];

^[2]; Young, Glenn R. ^[2]; Collaboration, Phenix ^[3]

University of Colorado, Boulder
ORNL
PHENIX Collaboration

Heavy-flavor production in p + p collisions is a good test of perturbative-quantum-chromodynamics (pQCD) calculations. Modification of heavy-flavor production in heavy-ion collisions relative to binary-collision scaling from p + p results, quantified with the nuclear-modification factor (R{sub AA}), provides information on both cold- and hot-nuclear-matter effects. Midrapidity heavy-flavor R{sub AA} measurements at the Relativistic Heavy Ion Collider have challenged parton-energy-loss models and resulted in upper limits on the viscosity-entropy ratio that are near the quantum lower bound. Such measurements have not been made in the forward-rapidity region. Determine transverse-momentum (p{sub T}) spectra and the corresponding R{sub AA} for muons from heavy-flavor meson decay in p + p and Cu + Cu collisions at {radical}s{sub NN} = 200 GeV and y = 1.65. Results are obtained using the semileptonic decay of heavy-flavor mesons into negative muons. The PHENIX muon-arm spectrometers measure the p{sub T} spectra of inclusive muon candidates. Backgrounds, primarily due to light hadrons, are determined with a Monte Carlo calculation using a set of input hadron distributions tuned to match measured-hadron distributions in the same detector and statistically subtracted. The charm-production cross section in p + p collisions at {radical}s = 200 GeV, integrated over p{sub T} and in the rapidity range 1.4 < y < 1.9, is found to be d{sigma}{sub cc}{sup -}/dy = 0.139 {+-} 0.029 (stat){sub -0.058}{sup +0.051} (syst) mb. This result is consistent with a perturbative fixed-order-plus-next-to-leading-log calculation within scale uncertainties and is also consistent with expectations based on the corresponding midrapidity charm-production cross section measured by PHENIX. The R{sub AA} for heavy-flavor muons in Cu + Cu collisions is measured in three centrality bins for 1 < p{sub T} < 4 GeV/c. Suppression relative to binary-collision scaling (R{sub AA} < 1) increases with centrality. Within experimental and theoretical uncertainties, the measured charm yield in p + p collisions is consistent with state-of-the-art pQCD calculations. Suppression in central Cu + Cu collisions suggests the presence of significant cold-nuclear-matter effects and final-state energy loss.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1049089

Journal Information:: Physical Review C, Vol. 86, Issue 2; ISSN 0556-2813

Country of Publication:: United States

Language:: English

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Title: Nuclear-Modification Factor for Open-Heavy-Flavor Production at Forward Rapidity in Cu+Cu Collisions at √s_NN=200 GeV

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