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Directed flow of lambda hyperons in (2-6 )A GeV Au+Au collisions |
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| Authors: | Chung P Ajitanand N N Alexander J M Anderson M Best D Brady F P Case T Caskey W Cebra D Chance J L Cole B Crowe K Das A Draper J E Gilkes M L Gushue S Heffner M Hirsch A S Hjort E L Huo L Justice M Kaplan M Keane D Kintner J C Klay J Krofcheck D Lacey R A Lauret J Lisa M A Liu H Liu Y M McGrath R Milosevich Z Odyniec G Olson D L Panitkin S Y Pinkenburg C Porile N T Rai G Ritter H G Romero J L Scharenberg R Schroeder L Srivastava B Stone N T Symons T J Wienold T Witt R Whitfield J Wood L Zhang W N;E Collaboration |
| Institution: | Chung P,Ajitanand N N,Alexander J M,Anderson M,Best D,Brady F P,Case T,Caskey W,Cebra D,Chance J L,Cole B,Crowe K,Das A,Draper J E,Gilkes M L,Gushue S,Heffner M,Hirsch A S,Hjort E L,Huo L,Justice M,Kaplan M,Keane D,Kintner J C,Klay J,Krofcheck D,Lacey R A,Lauret J,Lisa M A,Liu H,Liu Y M,McGrath R,Milosevich Z,Odyniec G,Olson D L,Panitkin S Y,Pinkenburg C,Porile N T,Rai G,Ritter H G,Romero J L,Scharenberg R,Schroeder L,Srivastava B,Stone N T,Symons T J,Wienold T,Witt R,Whitfield J,Wood L,Zhang W N;E895 Collaboration |
| Abstract: | Directed flow measurements for Lambda hyperons are presented and compared to those for protons produced in the same Au+Au collisions (2A, 4A, and 6A GeV; b<5-6 fm). The measurements indicate that Lambda hyperons flow consistently in the same direction but with smaller magnitudes. A strong positive flow for Lambdas] has been predicted in calculations which include the influence of the Lambda-nucleon potential. The experimental flow ratio Lambda/p is in qualitative agreement with expectations (approximately 2/3) from the quark counting rule at 2A GeV but is found to decrease with increasing beam energy. |
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