First results from PHENIX (I) Energy density (submitted to PRL)

• ET measured by calorimetry: PHENIX EMCal is a good hadronic calorimeter: EThad = (1.17±0.05) ETEMCal

70% larger than SPS

It turns out that:

(modulo limitations of Bjorken’s estimate)

… but is this energy fully thermalized ?

eBjorken ~ 5.0 GeV/fm3

dET/dh at |h|ɘ.35, Dj = 45o

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