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Measurement of long-range angular correlation and quadrupole anisotropy of pions and (anti)protons in central d+Au collisions at $$sqrt{s_{NN}} = 200$$ GeV

$$sqrt{s_{NN}}$$=200GeVでの重陽子-金中心衝突におけるパイ中間子および(反)陽子の長距離角相関と4極異方性の測定

Adare, A.*; 今井 憲一; 谷田 聖; PHENIX Collaboration*; 他421名*

Adare, A.*; Imai, Kenichi; Tanida, Kiyoshi; PHENIX Collaboration*; 421 of others*

We present azimuthal angular correlations between charged hadrons and energy deposited in calorimeter towers in central $$d$$ + Au and minimum bias $$p+p$$ collisions at $$sqrt{s_{NN}} = 200$$ GeV. The charged hadron is measured at midrapidity $$|eta| < 0.35$$, and the energy is measured at large rapidity ($$-3.7 < eta < -3.1$$, Au-going direction). An enhanced near-side angular correlation across $$|eta| < 2.75$$ is observed in $$d$$+Au collisions. Using the event plane method applied to the Au-going energy distribution, we extract the anisotropy strength $$v_2$$ for inclusive charged hadrons at midrapidity up to $$p_T < 4.5; {rm GeV}/c$$. We also present the measurement of $$v_2$$ for identified $$pi^{pm}$$ and and (anti)protons in central $$d$$ + Au collisions, and observe a mass-ordering pattern similar to that seen in heavy-ion collisions. These results are compared with viscous hydrodynamic calculations and measurements from $$p$$ + Pb at $$sqrt{s_{NN}}$$ = 5.02 TeV. The magnitude of the mass ordering in $$d$$+Au is found to be smaller than that in $$p$$+Pb collisions, which may indicate smaller radial flow in lower energy $$d$$+Au collisions.

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パーセンタイル:1.43

分野:Physics, Multidisciplinary

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