4,937 research outputs found
Effective field theories for baryons with two- and three-heavy quarks
Baryons made of two or three heavy quarks can be described in the modern
language of non-relativistic effective field theories. These, besides allowing
a rigorous treatment of the systems, provide new insight in the nature of the
three-body interaction in QCD.Comment: 7 pages, 1 figure; published versio
On Statistical Mechanics Developments of Clan Concept in Multiparticle Production
Clan concept has been introduced in multiparticle dynamics in order to
interpret the wide occurrence of negative binomial (NB) regularity in n-charged
particle multiplicity distributions (MDs) in various high energy collisions.
The centrality of clan concept led to the attempt to justify its occurrence
within a statistical model of clan formation and evolution. In this framework
all thermodynamical potentials have been explicitly calculated in terms of NB
parameters. Interestingly it was found that NB parameter k corresponds to the
one particle canonical partition function. The goal of this paper is to explore
a possible temperature and volume dependence of parameter k in various classes
of events in high energy hadron-hadron collisions. It is shown that the
existence of a phase transition at parton level from the ideal clan gas
associated to the semihard component with k>1 to the ideal clan gas of the hard
component with k<1 implies a discontinuity in the average number of particles
at hadron level.Comment: 20 pages, latex, no figures; v2: the description of the framework has
been considerably expanded, and the main body has been reorganized for
clarit
Simulation of ion cyclotron heating of tokamak plasmas using coupled Maxwell and quasilinear-Fokker-Planck solvers
Model-independent Study of Electric Dipole Transitions in Quarkonium
The paper contains a systematic, model-independent treatment of electric
dipole (E1) transitions in heavy quarkonium. Within the effective field theory
framework of potential non-relativistic QCD (pNRQCD), we derive the complete
set of relativistic corrections of relative order v^2 both for weakly and
strongly-coupled quarkonia. The result supports and complements former results
from potential model calculations.Comment: 42 pages, 9 figure
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