scholarly journals Hadron formation time and dilepton mass spectra in heavy ion collisions

1997 ◽  
Vol 411 (1-2) ◽  
pp. 187-192 ◽  
Author(s):  
Peter Filip ◽  
Ján Pišút
Keyword(s):  
Heavy Ion Collisions ◽  
Mass Spectra ◽  
Heavy Ion ◽  
Formation Time ◽  
Ion Collisions ◽  
Hadron Formation

scholarly journals Apparent and Actual Shifts in Mass and Width of ϕ Mesons Produced in Heavy-Ion Collisions

1997 ◽  
Vol 12 (02) ◽  
pp. 127-134 ◽  
Author(s):  
R. S. Bhalerao ◽  
S. K. Gupta
Keyword(s):  
Invariant Mass ◽  
Preliminary Data ◽  
Heavy Ion Collisions ◽  
Mass Spectra ◽  
Dense Matter ◽  
Heavy Ion ◽  
High Energy ◽  
Mass Shift ◽  
Ion Collisions ◽  
Invariant Mass Spectra

We present a method of analyzing invariant-mass spectra of kaon pairs resulting from decay of ϕ mesons produced in high-energy heavy-ion collisions. It can be used to extract the shifts in the mass and the width (ΔM and ΔΓ) of the ϕ mesons when they are inside the dense matter formed in these collisions. We illustrate our method with the help of available preliminary data. Extracted values of ΔM and ΔΓ are significantly larger than those obtained with an earlier method. Our results are consistent with the experimentally observed pT dependence of the mass shift. Finally, we present a phenomenological relation between ΔM and ΔΓ. It provides a useful constraint on theories which predict the values of these two quantities.

scholarly journals Re-hardening of hadron transverse mass spectra in relativistic heavy-ion collisions

Pramana ◽  
2006 ◽  
Vol 66 (5) ◽  
pp. 809-816
Author(s):  
P. K. Sahu ◽  
N. Otuka ◽  
M. Isse ◽  
Y. Nara ◽  
A. Ohnishi
Keyword(s):  
Heavy Ion Collisions ◽  
Mass Spectra ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Transverse Mass ◽  
Ion Collisions
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