Abstract
Background: 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 (RAA), provides information on both cold- and hot-nuclear-matter effects. Midrapidity heavy-flavor RAA 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. Purpose: Determine transverse-momentum (pT) spectra and the corresponding RAA for muons from heavy-flavor meson decay in p + p and Cu + Cu collisions at √sNN=200 GeV and y=1.65. Method: Results are obtained using the semileptonic decay of heavy-flavor mesons into negative muons. The PHENIX muon-arm spectrometers measure the pT 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. Results: The charm-production cross section in p + p collisions at √s=200 GeV, integrated over pT and in the rapidity range 1.4<y<1.9, is found to be dσcc̄/dy=0.139±0.029(stat)-0.058+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 RAA for heavy-flavor muons in Cu + Cu collisions is measured in three centrality bins for 1<pT<4 GeV/c. Suppression relative to binary-collision scaling (RAA<1) increases with centrality. Conclusions: 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.
| Original language | English |
|---|---|
| Article number | 024909 |
| Journal | Physical Review C - Nuclear Physics |
| Volume | 86 |
| Issue number | 2 |
| DOIs | |
| State | Published - Aug 20 2012 |
Funding
| Funders | Funder number |
|---|---|
| Japan Society for the Promotion of Science | 24105002, 20224014 |
| Japan Society for the Promotion of Science |
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In: Physical Review C - Nuclear Physics, Vol. 86, No. 2, 024909, 20.08.2012.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Nuclear-modification factor for open-heavy-flavor production at forward rapidity in Cu+Cu collisions at √sNN=200 GeV
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PY - 2012/8/20
Y1 - 2012/8/20
N2 - Background: 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 (RAA), provides information on both cold- and hot-nuclear-matter effects. Midrapidity heavy-flavor RAA 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. Purpose: Determine transverse-momentum (pT) spectra and the corresponding RAA for muons from heavy-flavor meson decay in p + p and Cu + Cu collisions at √sNN=200 GeV and y=1.65. Method: Results are obtained using the semileptonic decay of heavy-flavor mesons into negative muons. The PHENIX muon-arm spectrometers measure the pT 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. Results: The charm-production cross section in p + p collisions at √s=200 GeV, integrated over pT and in the rapidity range 1.4cc̄/dy=0.139±0.029(stat)-0.058+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 RAA for heavy-flavor muons in Cu + Cu collisions is measured in three centrality bins for 1T<4 GeV/c. Suppression relative to binary-collision scaling (RAA<1) increases with centrality. Conclusions: 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.
AB - Background: 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 (RAA), provides information on both cold- and hot-nuclear-matter effects. Midrapidity heavy-flavor RAA 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. Purpose: Determine transverse-momentum (pT) spectra and the corresponding RAA for muons from heavy-flavor meson decay in p + p and Cu + Cu collisions at √sNN=200 GeV and y=1.65. Method: Results are obtained using the semileptonic decay of heavy-flavor mesons into negative muons. The PHENIX muon-arm spectrometers measure the pT 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. Results: The charm-production cross section in p + p collisions at √s=200 GeV, integrated over pT and in the rapidity range 1.4cc̄/dy=0.139±0.029(stat)-0.058+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 RAA for heavy-flavor muons in Cu + Cu collisions is measured in three centrality bins for 1T<4 GeV/c. Suppression relative to binary-collision scaling (RAA<1) increases with centrality. Conclusions: 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.
UR - http://www.scopus.com/inward/record.url?scp=84865773583&partnerID=8YFLogxK
U2 - 10.1103/PhysRevC.86.024909
DO - 10.1103/PhysRevC.86.024909
M3 - Article
AN - SCOPUS:84865773583
SN - 0556-2813
VL - 86
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 2
M1 - 024909
ER -