Abstract
Background: Heavy-flavor modification in relativistic p(d)+A collisions are sensitive to different kinds of strong-interaction physics ranging from modifications of the nuclear wave function to initial- and final-state energy loss. Modifications to single heavy-flavor particles and their decay leptons at midrapidity and forward rapidity are well established at the Relativistic Heavy Ion Collider (RHIC). Purpose: This paper presents measurements of azimuthal correlations of electron-muon pairs produced from heavy-flavor decays, primarily cc̄, in sNN=200 GeV p+p and d+Au collision using the PHENIX detector at RHIC. The electrons are measured at midrapidity while the muons in the pair are measured at forward rapidity, defined as the direction of the deuteron beam, in order to utilize the deuteron to probe low-x partons in the gold nucleus. Methods: This analysis uses the central spectrometer arms for electron identification and forward spectrometer arms for muon identification. Azimuthal correlations are built in all sign combinations for e-μ pairs. Subtracting the like-sign yield from the unlike-sign yield removes the correlations from light flavor decays and conversions. Results: Comparing the p+p results with several different Monte Carlo event generators, we find the results are consistent with a total charm cross section σcc̄=538±46 (stat) ± 197 (data syst) ± 174 (model syst) μb. These generators also indicate that the back-to-back peak at Δφ=π is dominantly from the leading-order contributions (gluon fusion), while higher-order processes (flavor excitation and gluon splitting) contribute to the yield at all Δφ. We observe a suppression in the pair yield per collision in d+Au. We find the pair yield suppression factor for 2.7<Δφ<3.2 rad is JdA=0.433±0.087 (stat) ± 0.135 (syst). Conclusions: The e-μ pairs result from partons at xAu∼10-2 at Q2=10 GeV/c2 at the edge of the shadowing region. The pair suppression indicates modification to cc̄ pairs for these kinematics in the cold nuclear medium at RHIC.
| Original language | American English |
|---|---|
| Article number | 034915 |
| Journal | Physical Review C - Nuclear Physics |
| Volume | 89 |
| Issue number | 3 |
| DOIs | |
| State | Published - 31 Mar 2014 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
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In: Physical Review C - Nuclear Physics, Vol. 89, No. 3, 034915, 31.03.2014.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Heavy-flavor electron-muon correlations in p+p and d+Au collisions at sNN =200 GeV
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N1 - Office of Nuclear Physics in the Office of Science of the Department of Energy; National Science Foundation; Renaissance Technologies LLC; Abilene Christian University Research Council; Research Foundation of SUNY; College of Arts and Sciences, Vanderbilt University (U.S.A.); Ministry of Education, Culture, Sports, Science, and Technology; Japan Society for the Promotion of Science (Japan); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (Brazil); Natural Science Foundation of China (P. R. China); Ministry of Education, Youth and Sports (Czech Republic); Centre National de la Recherche Scientifique; Commissariat a l'Energie Atomique; Institut National de Physique Nucleaire et de Physique des Particules (France); Bundesministerium fur Bildung und Forschung; Deutscher Akademischer Austausch Dienst; Alexander von Humboldt Stiftung (Germany); Hungarian National Science Fund, OTKA (Hungary); Department of Atomic Energy and Department of Science and Technology (India); Israel Science Foundation (Israel); National Research Foundation; WCU program of the Ministry Education Science and Technology (Korea); Physics Department, Lahore University of Management Sciences (Pakistan); Ministry of Education and Science; Russian Academy of Sciences; Federal Agency of Atomic Energy (Russia); VR and Wallenberg Foundation (Sweden); U.S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union; US-Hungarian Fulbright Foundation for Educational Exchange; US-Israel Binational Science FoundationWe thank the staff of the Collider-Accelerator and Physics Departments at Brookhaven National Laboratory and the staff of the other PHENIX participating institutions for their vital contributions. We acknowledge support from the Office of Nuclear Physics in the Office of Science of the Department of Energy, the National Science Foundation, a sponsored research grant from Renaissance Tech
PY - 2014/3/31
Y1 - 2014/3/31
N2 - Background: Heavy-flavor modification in relativistic p(d)+A collisions are sensitive to different kinds of strong-interaction physics ranging from modifications of the nuclear wave function to initial- and final-state energy loss. Modifications to single heavy-flavor particles and their decay leptons at midrapidity and forward rapidity are well established at the Relativistic Heavy Ion Collider (RHIC). Purpose: This paper presents measurements of azimuthal correlations of electron-muon pairs produced from heavy-flavor decays, primarily cc̄, in sNN=200 GeV p+p and d+Au collision using the PHENIX detector at RHIC. The electrons are measured at midrapidity while the muons in the pair are measured at forward rapidity, defined as the direction of the deuteron beam, in order to utilize the deuteron to probe low-x partons in the gold nucleus. Methods: This analysis uses the central spectrometer arms for electron identification and forward spectrometer arms for muon identification. Azimuthal correlations are built in all sign combinations for e-μ pairs. Subtracting the like-sign yield from the unlike-sign yield removes the correlations from light flavor decays and conversions. Results: Comparing the p+p results with several different Monte Carlo event generators, we find the results are consistent with a total charm cross section σcc̄=538±46 (stat) ± 197 (data syst) ± 174 (model syst) μb. These generators also indicate that the back-to-back peak at Δφ=π is dominantly from the leading-order contributions (gluon fusion), while higher-order processes (flavor excitation and gluon splitting) contribute to the yield at all Δφ. We observe a suppression in the pair yield per collision in d+Au. We find the pair yield suppression factor for 2.7<Δφ<3.2 rad is JdA=0.433±0.087 (stat) ± 0.135 (syst). Conclusions: The e-μ pairs result from partons at xAu∼10-2 at Q2=10 GeV/c2 at the edge of the shadowing region. The pair suppression indicates modification to cc̄ pairs for these kinematics in the cold nuclear medium at RHIC.
AB - Background: Heavy-flavor modification in relativistic p(d)+A collisions are sensitive to different kinds of strong-interaction physics ranging from modifications of the nuclear wave function to initial- and final-state energy loss. Modifications to single heavy-flavor particles and their decay leptons at midrapidity and forward rapidity are well established at the Relativistic Heavy Ion Collider (RHIC). Purpose: This paper presents measurements of azimuthal correlations of electron-muon pairs produced from heavy-flavor decays, primarily cc̄, in sNN=200 GeV p+p and d+Au collision using the PHENIX detector at RHIC. The electrons are measured at midrapidity while the muons in the pair are measured at forward rapidity, defined as the direction of the deuteron beam, in order to utilize the deuteron to probe low-x partons in the gold nucleus. Methods: This analysis uses the central spectrometer arms for electron identification and forward spectrometer arms for muon identification. Azimuthal correlations are built in all sign combinations for e-μ pairs. Subtracting the like-sign yield from the unlike-sign yield removes the correlations from light flavor decays and conversions. Results: Comparing the p+p results with several different Monte Carlo event generators, we find the results are consistent with a total charm cross section σcc̄=538±46 (stat) ± 197 (data syst) ± 174 (model syst) μb. These generators also indicate that the back-to-back peak at Δφ=π is dominantly from the leading-order contributions (gluon fusion), while higher-order processes (flavor excitation and gluon splitting) contribute to the yield at all Δφ. We observe a suppression in the pair yield per collision in d+Au. We find the pair yield suppression factor for 2.7<Δφ<3.2 rad is JdA=0.433±0.087 (stat) ± 0.135 (syst). Conclusions: The e-μ pairs result from partons at xAu∼10-2 at Q2=10 GeV/c2 at the edge of the shadowing region. The pair suppression indicates modification to cc̄ pairs for these kinematics in the cold nuclear medium at RHIC.
UR - http://www.scopus.com/inward/record.url?scp=84898810279&partnerID=8YFLogxK
U2 - https://doi.org/10.1103/PhysRevC.89.034915
DO - https://doi.org/10.1103/PhysRevC.89.034915
M3 - Article
SN - 0556-2813
VL - 89
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 3
M1 - 034915
ER -