Why are the dilepton temperatures at the relativistic heavy-ion colliders are constant, T ~ 0.3 GeV?
Abstract
The STAR collaboration at RHIC and the ALICE collaboration at the LHC have reported dielectron spectra in the intermediate mass region, M = (1-3) GeV, which reveal a strikingly constant, energy-independent emission temperature TIMR 0.3~GeV over a broad range of collision energies, sNN = 27 - 5020~GeV. This unexpected ''thermostat'' behavior raises fundamental questions: why does the temperature remain constant despite increasing collision energy,and what mechanism governs this apparent universality?
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