Time-of-flight particle identification results from central silicon-silicon and silicon-tungsten collisions at 14.6 x A GeV/c

[摘要] Momentum spectra of $pisp-$, $Ksp-$, p and d have been measured from central collisions of 14.6 $imes$ A GeV/c Si beam on Si and W targets at rapidity 1.9 $<$ y $<$ 2.1. The inverse slope parameters $Tsb0$ obtained by an exponential fit with the transverse mass spectra in transverse kinetic energy are found to be $Tsb0(pisp-) < Tsb0(Ksp-) < Tsb0(p) < Tsb0(d)$. This result is predicted by a radially expanding flow model. From integrated results, the $Ksp-/pisp-$ ratios, (2.7 $pm$ 0.3) % from Si and (2.4 $pm$ 0.2) % from W, are consistent with pp collision results. The deuteron production rates can be explained by a relativistic coalescence model.

[发布机构] Rice University

[效力级别] Elementary particles