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Systematics of mid-rapidity K-/pi ratio in heavy-ion collisions

Fuqiang Wang
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Abstract

It is observed that K-/pi in A+A and possibly p+p and pbar+p collisions follows an interesting systematic in omega, the pion transverse energy per unit of rapidity and transverse overlap area. The systematics show a linear increase of K-/pi with omega in the AGS and SPS energy regime and a saturation at RHIC energy. The systematics indicate that omega might be the relevant variable underlying K-/pi. At high energy, the omega variable is related to the gluon saturation scale in high density QCD, and perhaps to the initial energy density in the Bjorken picture.

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Fuqiang Wang. 2002-08-20. Systematics of mid-rapidity K-/pi ratio in heavy-ion collisions. https://doi.org/10.1088/0954-3899%2F28%2F7%2F380

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