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Conference Paper

Latest results from CERES/NA45


Rak,  J.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;


Wurm,  J. P.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Adamová, D., Agakichiev, G., Appelshäuser, H., Belaga, V., Braun-Munzinger, P., Campagnolo, R., et al. (2003). Latest results from CERES/NA45. Nuclear Physics A, 715, 262c-271c.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-8F27-C
In this talk latest results from the analysis of e ‘e--pairs emitted in Pb+Au collisions at, 40 AGeV/c and a combined analysis of all data available at 158 AGeV/c are presented. The enhancement of low-mass e+e - -pairs (mee >0.2 GeV/c2) with respect to the expected yield from hadron decays first reported at 158 AGeV/c is also found at 40 AGeV/c and is mm larger t,here. Comparing to various theoretical models based on ~T+x- annihilation, the data carp only 1x1 reproduced. if the prop&es of the intermediate p in the hot and :ittilsti !urdium are n~otlificd. Throret icdlly. I he modific~ation is linked to baryon densit> rdt her ! haI1 rf~rI!iJeI,aturc‘. Cr,l!5tI’:lil?tS from !luth111 dilta t dWl1 ;It thP ‘XliC hP?lIli cwqif5 ;iitlerii iliciicate a Ilrt~tAl t~vollitiofl dlolig ki trk3jwI.orv r~f llighrr lxn’riri :lr~l!SiiJ ;~t li! :1GeV/c. consist,ent with the observed la.rger enhancement factor.