sNN=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

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書誌事項

タイトル別名
  • Measurement of long-range angular correlation and quadrupole anisotropy of pions and (anti)protons in central d+Au collisions at sNN = 200 GeV
  • Measurement of Long-Range Angular Correlation and Quadrupole Anisotropy of Pions and (Anti)Protons in Central<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi><mml:mo>+</mml:mo><mml:mi>Au</mml:mi></mml:mrow></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn></mml:mrow></mml:math>GeV

抄録

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.

収録刊行物

  • Physical Review Letters

    Physical Review Letters 114 (19), 192301_1-192301_8, 2015-05

    American Physical Society (APS)

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