Nuclear Theory·nucl-th

Friday·July 16, 2021

3 papers—1 primary·2 cross-listed

02
Studying of final states in p-Au and p-Pb collisions
Tetiana Obikhod🇺🇦 · Ievgenii Petrenko🇺🇦
In the framework of PYTHIA8.2 program we considered p-Pb and p-Au heavy ion collisions at the energy of 5.02 TeV and 8 TeV. The advantage of this program is in the combining of several nucleon-nucleon collisions into one heavy ion collision, based on phenomenological treatment of a hadron as a vortex line in a color superconducting medium, the consistent treatment of the central rapidity region with improvements of Glauber-like model where diffractive excitation processes are taken into account. We have considered the influence of impact parameter correlations on the production cross sections of p-Pb and p-Au processes to estimate the influence of hard and soft subprocesses on basic hadronic final-state properties in proton-ion collisions. Using these characteristics based on semi-hard multiparton interaction model we received the transverse momentum and rapidity distributions of K-meson and Lambda baryon at the energy of 5.02 TeV and 8.14 TeV.
↳ hep-phnucl-thPoS(2022)·1 citation
03
The $π f_{0} (500)$ decay of the $a_{1} (1260)$
R. Molina🇪🇸 · M. Doering🇺🇸 · W. H. Liang🇨🇳 · E. Oset🇪🇸
We evaluate the $a_{1} (1260) \to π σ (f_{0} (500))$ decay width from the perspective that the $a_{1} (1260)$ resonance is dynamically generated from the pseudoscalar-vector interaction and the $σ$ arises from the pseudoscalar-pseudoscalar interaction. A triangle mechanism with $a_{1} (1260) \to ρ π$ followed by $ρ \to π π$ and a fusion of two pions within the loop to produce the $σ$ provides the mechanism for this decay under these assumptions for the nature of the two resonances. We obtain widths of the order of $13 - 22$ MeV. Present experimental results differ substantially from each other, suggesting that extra efforts should be devoted to the precise extraction of this important partial decay width, which should provide valuable information on the nature of the axial vector and scalar meson resonances and help clarify the role of the $π σ$ channel in recent lattice QCD calculations of the $a_{1}$ .
↳ hep-phnucl-thEPJC(2021)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE

Studying of final states in p-Au and p-Pb collisions

The πf0​(500) decay of the a1​(1260)

Affiliations

The $π f_{0} (500)$ decay of the $a_{1} (1260)$