Nuclear Theory·nucl-th

Friday·May 29, 2020

11 papers—2 primary·9 cross-listed

01
[Submitted on 28 May 2020]
Light mesons within the basis light-front quantization framework
Wenyang Qian (1)🇺🇸 · Shaoyang Jia (1)🇺🇸 · Yang Li (1 and 2)🇺🇸 · James P. Vary (1) ((1) Iowa State University, (2) University of Chinese Academy of Sciences)🇺🇸
We study the light-unflavored mesons as relativistic bound states in the nonperturbative Hamiltonian formalism of the basis light-front quantization (BLFQ) approach. The dynamics for the valence quarks of these mesons is specified by an effective Hamiltonian containing the one-gluon exchange interaction and the confining potentials both introduced in our previous work on heavy quarkonia, supplemented additionally by a pseudoscalar contact interaction. We diagonalize this Hamiltonian in our basis function representation to obtain the mass spectrum and the light-front wave functions (LFWFs). Based on these LFWFs, we then study the structure of these mesons by computing the electromagnetic form factors, the decay constants, the parton distribution amplitudes (PDAs), and the parton distribution functions (PDFs). Our results are comparable to those from experiments and other theoretical models.
Comments:
12 pages, 6 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2005.13806 [pdf]
PRC(2020)·50 citations
02
[Submitted on 28 May 2020]
In-medium pion dispersion relation and medium correction of $N π \leftrightarrow Δ$ near the threshold energy of pion production
Ying Cui🇨🇳 · Yingxun Zhang🇨🇳 · Zhuxia Li🇨🇳
Transport models cannot simultaneously explain very recent data on pion multiplicities and pion charged ratios of Sn+Sn in the reaction at 0.27 A GeV. This stimulates further investigations on the pion dispersion relation, in-medium $N π \to Δ$ cross sections and $Δ \to N π$ decay widths near the threshold energy or at subthreshold energy of pion production in isospin asymmetric nuclear matter. In this study, the pion dispersion relation, in-medium $N π \to Δ$ cross section and $Δ \to N π$ decay width near the threshold energy are investigated in isospin asymmetric nuclear matter by using the one-boson-exchange model. With the consideration of the energy conservation effect, the in-medium $N π \to Δ$ cross sections are enhanced at $s^{1/2} < 1.11$ GeV in nuclear medium. The prediction of pion multiplicity and $π^{-} / π^{+}$ ratios near the threshold energy can be modified if this effect is considered in transport model simulations.
Comments:
15pages, 15figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2005.13845 [pdf]
CPC(2021)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE

Light mesons within the basis light-front quantization framework

In-medium pion dispersion relation and medium correction of Nπ↔Δ near the threshold energy of pion production

Affiliations

In-medium pion dispersion relation and medium correction of $N π \leftrightarrow Δ$ near the threshold energy of pion production