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Cross section and transverse single-spin asymmetry of muons from open heavy-flavor decays in polarized $$p+p$$ collisions at $$sqrt{s}$$=200 GeV

$$sqrt{s}$$=200GeVでの偏極陽子-陽子衝突における重いクォークの崩壊からのミューオンの生成断面積とシングルスピン非対称性

Aidala, C.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他431名*

Aidala, C.*; Hasegawa, Shoichi; Imai, Kenichi; Nagamiya, Shoji; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; PHENIX Collaboration*; 431 of others*

The cross section and transverse single-spin asymmetries of $$mu^-$$ and $$mu^+$$ from open heavy-flavor decays in polarized $$p+p$$ collisions at $$sqrt{s}$$ = 200 GeV were measured by the PHENIX experiment during 2012 at the Relativistic Heavy Ion Collider. Because heavy-flavor production is dominated by gluon-gluon interactions at $$sqrt{s}$$ = 200 GeV, these measurements offer a unique opportunity to obtain information on the trigluon correlation functions. The measurements are performed at forward and backward rapidity ($$1.4 < |y| < 2.0$$) over the transverse momentum range of $$1.25 < p_T < 7$$ GeV/$$c$$ for the cross section and $$1.25 < p_T < 5$$ GeV/$$c$$ for the asymmetry measurements. The obtained cross section is compared to a fixed-order-plus-next-to-leading-log perturbative-quantum-chromodynamics calculation. The asymmetry results are consistent with zero within uncertainties, and a model calculation based on twist-3 three-gluon correlations agrees with the data.

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パーセンタイル:47.13

分野:Astronomy & Astrophysics

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