Papers › Finite resonance widths influence thermal model description of hadron yields
Finite resonance widths influence thermal model description of hadron yields
Volodymyr Vovchenko, Mark I. Gorenstein, Horst Stoecker
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Different scenarios for modeling resonances in a thermal model description of hadron yields measured in heavy-ion collisions are explored: the zero-width approximation, the energy independent Breit-Wigner scheme, and the energy dependent Breit-Wigner (eBW) scheme. Application of the eBW scheme leads to a notable suppression in the proton yields, stemming mainly from a reduced feeddown from Δ resonances because of the threshold effects. A significantly improved agreement of thermal model with hadron yields measured in Pb-Pb collisions at √(s_(_(NN))) = 2.76 TeV by the ALICE collaboration is obtained in the eBW scheme at T ≃155 MeV, indicating a possible resolution of the so-called 'proton anomaly'. The results obtained show that there are significant systematic uncertainties in the thermal model due to the modeling of broad resonances.
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