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Midrapidity Lambda and Lambda(macro) production in Au+Au collisions at the square root of [s(NN)]=130 GeV |
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| Authors: | Adler C Ahammed Z Allgower C Amonett J Anderson B D Anderson M Averichev G S Balewski J Barannikova O Barnby L S Baudot J Bekele S Belaga V V Bellwied R Berger J Bichsel H Billmeier A Bland L C Blyth C O Bonner B E Boucham A Brandin A Bravar A Cadman R V Caines H Calderón de la Barca Sánchez M Cardenas A Carroll J Castillo J Castro M Cebra D Chaloupka P Chattopadhyay S 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 Deng W S Derevschikov A A Didenko L Dietel T Draper J E Dunin V B Dunlop J C Eckardt V Efimov L G Emelianov V |
| Institution: | University of Frankfurt, Frankfurt, Germany. |
| Abstract: | We report the first measurement of strange (Lambda) and antistrange (Lambda macro) baryon production from square root of s(NN)]=130 GeV Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). Rapidity density and transverse mass distributions at midrapidity are presented as a function of centrality. The yield of Lambda and Lambda; hyperons is found to be approximately proportional to the number of negative hadrons. The production of Lambda; hyperons relative to negative hadrons increases very rapidly with transverse momentum. The magnitude of the increase cannot be described by existing hadronic string fragmentation models alone. |
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