Effect of secondary protons on baryon and proton number cumulants in event-by-event analysis

Hirosato Ono, Masayuki Asakawa, Masakiyo Kitazawa
2013 Physical Review C  
We investigate the effects of secondary (knockout) protons, which constitute about 20% of the observed protons at STAR, on the higher order cumulants of proton and baryon numbers measured by event-by-event analyses in relativistic heavy ion collisions. We argue that the contribution of this background effect on the cumulants is expressed by a simple formula, and that hence their effects can be removed in the experimental analysis. It is discussed that this background effect has non-negligible
more » ... ntribution to recently observed proton number cumulants at STAR, especially the third-order one, and that the removal of this effect is crucial to investigate the thermodynamical properties of the primordial hot medium appropriately.
doi:10.1103/physrevc.87.041901 fatcat:kacjqzksifa5vhfjft3gsftuya