Midrapidity Lambda and (Lambda)over-bar production in Au plus Au collisions at root s(NN)=130 GeV

0185568 - UJF-V 20020078 RIV US eng J - Článek v odborném periodiku
Adler, C. - Ahammed, Z. - Allgower, C. - Amonett, J. - Anderson, B. D. - Anderson, M. - Averichev, G. S. - Balewski, J. - Barannikova, O. - Barnby, L. S. - Šumbera, Michal - Zborovský, Imrich
Midrapidity Lambda and (Lambda)over-bar production in Au plus Au collisions at root s(NN)=130 GeV.
Physical Review Letters. Roč. 89, č. 9 (2002), s. 2301. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA MŠMT ME 475
Klíčová slova: Heavy-ion collisions * quark-gluon plasma * charged-particle multiplicity
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 7.323, rok: 2002

We report the first measurement of strange (Lambda) and antistrange (anti Lambda) baryon production from 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 anti Lambda overer bar hyperons is found to be approximately proportional to the number of negative hadrons. The production of(anti Lambda) over bar 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.
Trvalý link: http://hdl.handle.net/11104/0081958