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Particle-type dependence of azimuthal anisotropy and nuclear modification of particle production in Au+Au collisions at square root of sNN=200 GeV |
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| Authors: | Adams J Adler C Aggarwal M M Ahammed Z Amonett J Anderson B D Anderson M Arkhipkin D Averichev G S Badyal S K Balewski J Barannikova O Barnby L S Baudot J Bekele S Belaga V V Bellwied R Berger J Bezverkhny B I Bhardwaj S Bhaskar P Bhati A K Bichsel H Billmeier A Bland L C Blyth C O Bonner B E Botje M Boucham A Brandin A Bravar A Cadman R V Cai X Z Caines H Calderón de la Barca Sánchez M Carroll J Castillo J Castro M Cebra D Chaloupka P Chattopadhyay S Chen H F Chen Y Chernenko S P Cherney M Chikanian A Choi B Christie W Coffin J P Cormier T M Cramer J G Crawford H J Das D Das S |
| Institution: | University of Birmingham, Birmingham, United Kingdom. |
| Abstract: | We present STAR measurements of the azimuthal anisotropy parameter v(2) and the binary-collision scaled centrality ratio R(CP) for kaons and lambdas (Lambda+Lambda) at midrapidity in Au+Au collisions at square root of s(NN)=200 GeV. In combination, the v(2) and R(CP) particle-type dependencies contradict expectations from partonic energy loss followed by standard fragmentation in vacuum. We establish p(T) approximately 5 GeV/c as the value where the centrality dependent baryon enhancement ends. The K(0)(S) and Lambda+Lambda v(2) values are consistent with expectations of constituent-quark-number scaling from models of hadron formation by parton coalescence or recombination. |
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