Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-10-15
Phys.Lett. B446 (1999) 326-331
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 2 figures, REVTEX; mistake in plot of c-quark mt-distribution corrected, some references added
Scientific paper
10.1016/S0370-2693(98)01467-1
We employ the Monte-Carlo PYTHIA to calculate the transverse mass spectra of various hadrons and their inverse slopes T* at m_T-m=1.5-2 GeV in p+p reactions at sqrt(s)=200 GeV. Due to (multiple) minijet production T* increases as a function of the hadron mass. Moreover, the T*(m) systematics has a ``discontinuity'' at the charm threshold, i.e. the inverse slope of D-mesons is much higher than that of non-charmed hadrons and even of the heavier Lambda_C baryon. The experimental observation of this characteristic behaviour in Au+Au collisions would indicate the absence of c-quark rescattering. In contrast, the assumption of thermalized partons and hydrodynamical evolution would lead to a smoothly increasing T*(m), without discontinuity at the charm threshold. The degree of collective transverse flow, indicated by the slope of the T*(m) systematics, depends strongly on whether kinetic equilibrium is maintained for some time after hadronization or not.
Dumitru Adrian
Spieles C.
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