Nuclear Theory·nucl-th

Wednesday·October 28, 2015

10 papers—7 primary·3 cross-listed

08
Event-by-Event Study of Space-Time Dynamics in Flux-Tube Fragmentation
Cheuk-Yin Wong🇺🇸
In the semi-classical description of the flux-tube fragmentation process for hadron production and hadronization in high-energy $e^{+} e^{-}$ annihilations and $pp$ collisions, the rapidity-space-time ordering and the local conservation laws of charge, flavor, and momentum provide a set of powerful tools that may allow the reconstruction of the space-time dynamics of quarks and mesons in exclusive measurements of produced hadrons, on an event-by-event basis. We propose procedures to reconstruct the space-time dynamics from event-by-event exclusive hadron data to exhibit explicitly the ordered chain of hadrons produced in a flux tube fragmentation. As a supplementary tool, we infer the average space-time coordinates of the $q$ - $q ˉ$ pair production vertices from the $π^{-}$ rapidity distribution data obtained by the NA61/SHINE Collaboration in $pp$ collisions at $s$ = 6.3 to 17.3 GeV.
↳ hep-phnucl-thJ.Phys.G(2017)·2 citations
09
Chemical Freeze-out Parameters via a Non-perturbative QCD Approach
Jing Chen🇨🇳 · Fei Gao🇨🇳 · Yu-xin Liu🇨🇳
By analyzing the calculated baryon number susceptibility ratios $χ_{1}^{B} / χ_{2}^{B}$ and $χ_{3}^{B} / χ_{1}^{B}$ in two-flavor system via the Dyson-Schwinger equation approach of QCD, we determine the chemical freeze-out temperature and baryon chemical potential in cases of both thermodynamic limit and finite size. We calculate the center-of-mass energy dependence of the $χ_{4}^{B} / χ_{2}^{B} (κ σ^{2})$ at the freeze-out line and find an excellent agreement with experimental data in $S_{N N} \geq 19.6$ GeV region when taking into account the finite size effect. Our calculations indicate that the $κ σ^{2}$ exhibits a non-monotonic behavior in lower collision energy region.
↳ hep-phnucl-exnucl-th6 citations
10
On general ultraviolet properties of a class of confining propagators
M. A. L. Capri🇧🇷 · M. S. Guimaraes🇧🇷 · I. Justo🇧🇷 · L. F. Palhares🇧🇷 · S. P. Sorella🇧🇷
We study the ultraviolet properties of theories whose fundamental fields display a confining, Gribov-type, propagator. These are propagators that exhibit complex poles and violate positivity, thus precluding a physical propagating particle interpretation. We show that the properties of this type of confining propagators do not change the ultraviolet behavior of the theory, in the sense that no new ultraviolet primitive divergences are generated, thus securing the renormalizability of these confining theories. We illustrate these properties by studying a variety of models, including bosonic and fermionic confined degrees of freedom. The more intricate case of Super Yang-Mills with $N = 1$ supersymmetries in the Wess-Zumino gauge is taken as example in order to prove these statements to all orders by means of the algebraic renormalization set up.
↳ hep-thhep-phnucl-thEPJC(2016)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE

Event-by-Event Study of Space-Time Dynamics in Flux-Tube Fragmentation

Chemical Freeze-out Parameters via a Non-perturbative QCD Approach

On general ultraviolet properties of a class of confining propagators

Affiliations