Measurement of long-range angular correlation and quadrupole anisotropy of pions and (anti)protons in central d+Au collisions at √sN N = 200 GeV

Adare, A. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Csanád, Máté and Csörgő, Tamás and Dávid, Gábor and Kiss, Ádám and Nagy, Márton and Sziklai, János István and Vértesi, Róbert (2015) Measurement of long-range angular correlation and quadrupole anisotropy of pions and (anti)protons in central d+Au collisions at √sN N = 200 GeV. PHYSICAL REVIEW LETTERS, 114 (19). ISSN 0031-9007

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Abstract

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 root s(NN) = 200 GeV. The charged hadron is measured at midrapidity vertical bar eta vertical bar < 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 vertical bar Delta eta vertical bar > 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 GeV/c. We also present the measurement of v(2) for identified pi(+/-) 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 root 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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