Blast-Wave fit to spectra and HBT in AuAu @ 19.6 GeV

Updated on Sat, 2009-06-27 02:00 by testadmin. Originally created by chajecki on 2008-02-20 11:29.

1. Blast Wave fit to spectra and HBT from AuAu@19GeV.

Here, I present results of BW fit to spectra (from Daniel Cebra) and HBT radii from the most central [0-10%] Au+Au@19.6 GeV. I used Fabrice's code to do the fit.

Figure 1: Light particle spectra

Figure 2: HBT radii vs k_T

	Chi2/(number of data points)
π⁺ spectra	60.0394 / 31
π^- spectra	50.8827 / 31
K⁺ spectra	43.3543 / 20
K^- spectra	32.4811 / 19
p spectra	47.1665 / 28
pbar spectra	28.2348 / 28
π R_out	3.91632 / 4
π R_side	1.59221 / 4
π R_long	0.832901 / 4
Total	268.5/164

T (MeV)	106 ± 2
Rho0	0.83 ± 0.02
Rho2	0.058	fixed
Rho4	0	fixed
Rx (fm)	11.1 ± 0.5
Ry (fm)	11.1	fixed
As	0	fixed
Tau (fm/c)	7.3 ± 0.7	6.8 ± 0.3 -value obtained from the fit to R_long - see Fig. 4 and Fig. 5
Deltat (fm/c)	1.7 ± 0.7

Table 1: Fit results

In case someone wants to compare those results to BW fit results to RHIC data at 130 GeV presented in Retiere, Lisa, Phys.Rev.C70:044907,2004 I put a copy of the table from this paper here.