Jet-Hadron Correlations in √sNN = 200 GeV p+p and Central Au+Au Collisions

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) Jet-Hadron Correlations in √sNN = 200 GeV p+p and Central Au+Au Collisions. PHYSICAL REVIEW LETTERS, 112 (12). ISSN 0031-9007

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Abstract

Azimuthal angular correlations of charged hadrons with respect to the axis of a reconstructed (trigger) jet in Au+Au and p+p collisions at √sNN = 200 GeV in STAR are presented. The trigger jet population in Au+Au collisions is biased towards jets that have not interacted with the medium, allowing easier matching of jet energies between Au+Au and p+p collisions while enhancing medium effects on the recoil jet. The associated hadron yield of the recoil jet is significantly suppressed at high transverse momentum (passoc T ) and enhanced at low passoc T in 0-20% central Au+Au collisions compared to p+p collisions, which is indicative of medium-induced parton energy loss in ultrarela- tivistic heavy-ion collisions.

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