Dielectron Azimuthal Anisotropy at mid-rapidity in Au+Au collisions at √sNN = 200 GeV

Adamczyk, L. and Adkins, J. K. and Agakishiev, G. and Aggarwal, M. M. and Ahammed, Z. and Alekseev, I. and Alford, J. and Anson, C. D. and Aparin, A. and Arkhipkin, D. and Aschenauer, E. C. and Averichev, G. S. and Banerjee, A. and Beavis, D. R. and Bellwied, R. and Bhasin, A. and Bhati, A. K. and Bhattarai, P. and Bichsel, H. and Bielcik, J. and Bielcikova, J. and Bland, L. C. and Bordyuzhin, I. G. and Borowski, W. and Bouchet, J. and Brandin, A. V. and Brovko, S. G. and Bultmann, S. and Bunzarov, I. and Burton, T. P. and Vértesi, Róbert (2014) Dielectron Azimuthal Anisotropy at mid-rapidity in Au+Au collisions at √sNN = 200 GeV. PHYSICAL REVIEW C, 90 (6). ISSN 2469-9985

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Abstract

We report on the first measurement of the azimuthal anisotropy (v2) of dielectrons (e+e− pairs) at mid-rapidity from √sN N = 200 GeV Au+Au collisions with the STAR detector at RHIC, presented as a function of transverse momentum (pT ) for different invariant-mass regions. In the mass region Mee < 1.1 GeV/c2 the dielectron v2 measurements are found to be consistent with expectations from π0, η, ω and φ decay contributions. In the mass region 1.1 < Mee < 2.9 GeV/c2, the measured dielectron v2 is consistent, within experimental uncertainties, with that from the c¯c contributions.

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