Studying re-scattering effect in heavy-ion collision through K* production
Abstract
We have studied the K* production within a multi-phase transport model (AMPT) for Au+Au collisions at √ {sNN} = 200 GeV to understand the hadronic re-scattering effect on the measured yields of the resonance. The hadronic re-scattering of the K* decay daughter particles (π and K) will alter their momentum distribution thereby making it difficult to reconstruct the K* signal through the invariant mass method. An increased hadronic re-scattering effect thus leads to a decrease in the reconstructed yield of K* in the heavy-ion collisions. Through this simulation study, we argue that a decrease in K*/K ratio with the increase in collision centrality necessarily reflects the hadronic re-scattering effect. Since the re-scattering occurs in the hadronic phase and K* has a lifetime of 4 fm/c, we present a toy model-based discussion on using measured K*/K to put a lower limit on the hadronic phase lifetime in high energy nuclear collisions.
- Publication:
-
International Journal of Modern Physics E
- Pub Date:
- May 2015
- DOI:
- 10.1142/S021830131550041X
- arXiv:
- arXiv:1505.02342
- Bibcode:
- 2015IJMPE..2450041S
- Keywords:
-
- Resonances;
- re-scattering;
- heavy-ion collisions;
- 25.75.-q;
- 25.75.Ag;
- Relativistic heavy-ion collisions;
- Global features in relativistic heavy ion collisions;
- Nuclear Experiment;
- High Energy Physics - Phenomenology;
- Nuclear Theory
- E-Print:
- 9 pages, 5 figures, accepted for publication in IJMPE