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Measurements of $$mumu$$ pairs from open heavy flavor and Drell-Yan in $$p+p$$ collisions at $$sqrt{s}=200$$ GeV

$$sqrt{s}=200$$GeVでの陽子-陽子衝突におけるDrell-Yan過程および重クォーク生成からの$$mumu$$ペアの測定

Aidala, C.*; 長谷川 勝一; 今井 憲一; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他287名*

Aidala, C.*; Hasegawa, Shoichi; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; PHENIX Collaboration*; 287 of others*

PHENIX reports differential cross sections of $$mumu$$ pairs from semileptonic heavy-flavor decays and the Drell-Yan production mechanism measured in $$p$$$$+$$$$p$$ collisions at $$sqrt{s}=200$$ GeV at forward and backward rapidity ($$1.2 < |eta| < 2.2$$). The $$mumu$$ pairs from $$cbar{c}$$, $$bbar{b}$$, and Drell-Yan are separated using a simultaneous fit to unlike- and like-sign muon pair spectra in mass and $$p_T$$. The azimuthal opening angle correlation between the muons from $$cbar{c}$$ and $$bbar{b}$$ decays and the pair-$$p_T$$ distributions are compared to distributions generated using ${sc pythia}$ and ${sc powheg}$ models, which both include next-to-leading order processes. The measured distributions for pairs from $$cbar{c}$$ are consistent with ${sc pythia}$ calculations. The $$cbar{c}$$ data presents narrower azimuthal correlations and softer $$p_T$$ distributions compared to distributions generated from ${sc powheg}$. The $$bbar{b}$$ data are well described by both models. The extrapolated total cross section for bottom production is $$3.75{pm}0.24({rm stat}){pm}^{0.35}_{0.50}({rm syst}){pm}0.45({rm global})$$[$$mu$$b], which is consistent with previous measurements at the Relativistic Heavy Ion Collider in the same system at the same collision energy, and is approximately a factor of two higher than the central value calculated with theoretical models. The measured Drell-Yan cross section is in good agreement with next-to-leading-order quantum-chromodynamics calculations.

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パーセンタイル:49.94

分野:Astronomy & Astrophysics

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