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論文

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

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*

Physical Review D, 95(11), p.112001_1 - 112001_15, 2017/06

AA2017-0235.pdf:0.72MB

https://doi.org/10.1103/PhysRevD.95.112001
 被引用回数：17 パーセンタイル：63.64(Astronomy & Astrophysics)

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.

論文

Measurements of double-helicity asymmetries in inclusive $$J/psi$$ production in longitudinally polarized $$p+p$$ collisions at $$sqrt{s}=510$$ GeV

Adare, A.*; 今井 憲一; 長谷川 勝一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他328名*

Physical Review D, 94(11), p.112008_1 - 112008_10, 2016/12

AA2016-0475.pdf:0.51MB

https://doi.org/10.1103/PhysRevD.94.112008
 被引用回数：9 パーセンタイル：42.39(Astronomy & Astrophysics)

We report the double-helicity asymmetry, $$A_{LL}^{J/psi}$$, in inclusive $$J/psi$$ production at forward rapidity as a function of transverse momentum $$p_T$$ and rapidity $$|y|$$. The data analyzed were taken during $$sqrt{s}=510$$ GeV longitudinally polarized $$p+p$$ collisions at the Relativistic Heavy Ion Collider in the 2013 run using the PHENIX detector. At this collision energy, $$J/psi$$ particles are predominantly produced through gluon-gluon scatterings, thus $$A_{LL}^{J/psi}$$ is sensitive to the gluon polarization inside the proton. We measured $$A_{LL}^{J/psi}$$ by detecting the decay daughter muon pairs $$mu^+mu^-$$ within the PHENIX muon spectrometers in the rapidity range $$1.2<|y|<2.2$$. In this kinematic range, we measured the $$A_{LL}^{J/psi}$$ to be $$0.012 pm 0.010 ({rm stat}) pm 0.003 ({rm syst})$$. The $$A_{LL}^{J/psi}$$ can be expressed to be proportional to the product of the gluon polarization distributions at two distinct ranges of Bjorken $$x$$: one at moderate range $$x cong 5 times 10^{-2}$$ where recent data of jet and $$pi^0$$ double helicity spin asymmetries have shown evidence for significant gluon polarization, and the other one covering the poorly known small-x region $$x cong 2 times 10^{-3}$$ Thus our new results could be used to further constrain the gluon polarization for $$x < 5 times 10^{-2}$$.

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