Canonical description of strangeness conservation and particle production

Multiplicity fluctuations in limited segments of momentum space in statistical models

“…Thus, we obtain the well known canonical suppression of yields [19,20,21,22] and fluctuations [7,23].…”

“…(15) can essentially be found in two ways. The first way would be to integrate the distribution (20) over all possible values of multiplicity N Ω , while all other variables are set to their peak values, e.g. Q = V κ Q 1 , E = V κ E 1 , P = 0.…”

“…The second and more practical way is to use an approximation similar to Eq. (20) to describe the macro state Q j = (Q, E, P ). The normalization in Eq.…”

Enhanced strange baryon production in Au+Au collisions compared top+patsNN=200Abelev1, Aggarwal2, Ahammed3 et al. 2008Phys. Rev. C1104241View full textAdd to dashboardCite

“…If this is the case, any measured enhancement is really a phase-space suppression in p+p reactions that is removed in the heavy ion case. This lack of available phase space in small systems, such as those from p+p collisions, requires a canonical ensemble to be used, which results in a suppression of strangeness production when scaled to the appropriate volume [2,3]. However, there is no a priori method for directly calculating this volume, and thus the authors make the simplest hypothesis and assume that the volume is linearly proportional to the number of collision participants N part .…”

On charm production near the phase boundary

“…This increases, as mentioned already in [6], the (grand-canonical) thermal charm yield by about a factor 2.5, mostly because of the large statistical factors of the D * mesons. Since, despite this increase, the number of charm pairs is significantly less than 1 per collision, we treat the system, as proposed by Redlich [18], within canonical thermodynamics, following [19]. A similar approach was recently chosen by [20], to investigate limits on open charm production which are imposed within the present model by the data on J/ψ production.…”