Azimuthally anisotropic emission of low-momentum direct photons in Au+Au collisions at √.sup.s./sup.NN=200 GeV

0501338 - FZÚ 2019 RIV US eng J - Článek v odborném periodiku
Adare, A. - Afanasiev, S. - Aidala, C. - Mikeš, P. - Růžička, L. - Tomášek, Lukáš - Tomášek, Michal - Vrba, Václav … celkem 552 autorů
Azimuthally anisotropic emission of low-momentum direct photons in Au+Au collisions at √^sNN=200 GeV.
Physical Review C. Roč. 94, č. 6 (2016), s. 1-14, č. článku 064901. ISSN 2469-9985. E-ISSN 2469-9993
Institucionální podpora: RVO:68378271
Klíčová slova: bremsstrahlung * gold * PHENIX * Brookhaven RHIC Coll * numerical calculations * experimental methods * experimental results * 200 GeV/nucleon
Obor OECD: Particles and field physics
Impakt faktor: 3.820, rok: 2016

The PHENIX experiment at the BNL Relativistic Heavy Ion Collider has measured second- and third-order Fourier coefficients of the azimuthal distributions of direct photons emitted at midrapidity in Au+Au collisions at sNN=200 GeV for various collision centralities. Combining two different analysis techniques, results were obtained in the transverse momentum range of 0.4<pT<4.0 GeV/c. At low pT the second-order coefficients, v2, are similar to the ones observed in hadrons. Third-order coefficients, v3, are nonzero and almost independent of centrality. These new results on v2 and v3, combined with previously published results on yields, are compared to model calculations that provide yields and asymmetries in the same framework. Those models are challenged to explain simultaneously the observed large yield and large azimuthal anisotropies.
Trvalý link: http://hdl.handle.net/11104/0293324