Enhancement of low-mass dileptons in ultraperipheral collisions
نویسندگان
چکیده
منابع مشابه
Enhancement of low-mass dileptons in heavy ion collisions.
Using a relativistic transport model for the expansion stage of S+Au collisions at 200 GeV/nucleon, we show that the recently observed enhancement of low-mass dileptons by the CERES collaboration can be explained by the decrease of vector meson masses in hot and dense hadronic matter.
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Ultraperipheral collisions (UPC) are the processes that occur at impact parameter b > 2R, when the two ions do not interact hadronically. Instead one uses the strong Coulomb field surrounding the ions for elementary particle processes, see Fig. 1. The coherence of all the protons in the ion leads to an enhancement factor of Z (γγ) or Z (γA), respectively, compared to the one for pp or ee. This ...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2021
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-021-09053-4