Naslov
Azimuthally anisotropic emission of low-momentum direct photons in Au + Au collisions at sqrt(sNN)=200GeV

Autori
Adare, A. ; ... ; Makek, Mihael ; ... ; Zou, L.

Kolaboracija
PHENIX Collaboration

Izvornik
Physical review. C (2469-9985) 94 (2016), 6; 064901, 14

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
heavy-ion collision ; direct photons ; flow

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA