Measurements of mass-dependent azimuthal anisotropy in central p + Au, d + Au, and He 3 + Au collisions at sNN =200 GeV

A. Adare, C. Aidala, N. N. Ajitanand, Y. Akiba, M. Alfred, V. Andrieux, N. Apadula, H. Asano, B. Azmoun, V. Babintsev, A. Bagoly, M. Bai, N. S. Bandara, B. Bannier, K. N. Barish, S. Bathe, A. Bazilevsky, M. Beaumier, S. Beckman, R. BelmontA. Berdnikov, Y. Berdnikov, D. S. Blau, M. Boer, J. S. Bok, K. Boyle, M. L. Brooks, J. Bryslawskyj, V. Bumazhnov, S. Campbell, V. Canoa Roman, R. Cervantes, C. H. Chen, C. Y. Chi, M. Chiu, I. J. Choi, J. B. Choi, T. Chujo, Z. Citron, M. Connors, N. Cronin, M. Csanád, T. Csörgo, T. W. Danley, A. Datta, M. S. Daugherity, G. David, K. Deblasio, A. Oskarsson, D. Silvermyr, PHENIX Collaboration

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20 Citations (SciVal)


We present measurements of the transverse-momentum dependence of elliptic flow v2 for identified pions and (anti)protons at midrapidity (|η|<0.35), in 0%-5% central p+Au and He3+Au collisions at sNN=200 GeV. When taken together with previously published measurements in d+Au collisions at sNN=200 GeV, the results cover a broad range of small-collision-system multiplicities and intrinsic initial geometries. We observe a clear mass-dependent splitting of v2(pT) in d+Au and He3+Au collisions, just as in large nucleus-nucleus (A+A) collisions, and a smaller splitting in p+Au collisions. Both hydrodynamic and transport model calculations successfully describe the data at low pT (<1.5GeV/c), but fail to describe various features at higher pT. In all systems, the v2 values follow an approximate quark-number scaling as a function of the hadron transverse kinetic energy per constituent quark (KET/nq), which was also seen previously in A+A collisions.

Original languageEnglish
Article number064904
JournalPhysical Review C
Issue number6
Publication statusPublished - 2018 Jun 11

Subject classification (UKÄ)

  • Subatomic Physics


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