Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.082002
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Funding
- DOE Office of Science, NSF
- Renaissance Technologies (USA)
- MEXT and JSPS (Japan)
- CNPq and FAPESP (Brazil)
- NSFC (China)
- MSMT (Czech Republic)
- IN2P3/CNRS
- CEA (France)
- BMBF
- DAAD
- AvH (Germany)
- OTKA (Hungary)
- DAE ( India)
- ISF (Israel)
- KRF and KOSEF (Korea)
- MES, RAS, and FAAE (Russia)
- VR and KAW (Sweden)
- U.S. CRDF
- US-Hungary Fulbright
- US-Israel BSF
- Direct For Mathematical & Physical Scien
- Division Of Physics [855569] Funding Source: National Science Foundation
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The momentum distribution of electrons from semileptonic decays of charm and bottom quarks for midrapidity |y|< 0.35 in p+p collisions at s=200 GeV is measured by the PHENIX experiment at the Relativistic Heavy Ion Collider over the transverse momentum range 2 < p(T)< 7 GeV/c. The ratio of the yield of electrons from bottom to that from charm is presented. The ratio is determined using partial D/D -> e(+/-)K(-/+)X (K unidentified) reconstruction. It is found that the yield of electrons from bottom becomes significant above 4 GeV/c in p(T). A fixed-order-plus-next-to-leading-log perturbative quantum chromodynamics calculation agrees with the data within the theoretical and experimental uncertainties. The extracted total bottom production cross section at this energy is sigma(bb)=3.2(-1.1)(+1.2)(stat)(-1.3)(+1.4)(syst)mu b.
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