Nuclear Theory·nucl-th

Tuesday·November 26, 2019

15 papers—12 primary·3 cross-listed

13
Conundrum for the free energy of a holonomous gluonic plasma at cubic order
Christiaan P. Korthals Altes🇫🇷 · Hiromichi Nishimura🇯🇵 · Robert D. Pisarski🇺🇸 · Vladimir V. Skokov🇺🇸
We compute the term $\sim g^{3}$ in the free energy for a $S U (N)$ gauge theory with nonzero holonomy at nonzero temperature. If the holonomy is generated kinematically by the introduction of gauge invariant sources coupled to Polyakov loops, the contribution of charged (off-diagonal) gluons to the free energy at order $g^{3}$ , $F^{(3 : c.g.)}$ , is singular: $F^{(3 : c.g.)} \neq = 0$ without holonomy, but $F^{(3 : c.g.)} = 0$ when the holonomy is nonzero, even infinitesimally. We show that the absence of the charged gluon contribution is required by gauge invariance alone and is therefore a universal feature.
↳ hep-thhep-lathep-phnucl-thPLB(2020)·9 citations
14
True muonium production in ultraperipheral $P b P b$ collisions
C. Azevedo🇧🇷 · V.P. Goncalves🇧🇷 · B.D. Moreira🇧🇷
In this paper we investigate the production of a true muonium state, which is an atom consisting of a $μ^{+} μ^{-}$ bound state, by $γ γ$ interactions in ultraperipheral $P b P b$ collisions considering an accurate treatment of the absorptive corrections and for the nuclear form factor. The rapidity distributions and cross sections are estimated considering the RHIC, LHC and FCC energies. Our results indicate that the experimental analysis can be useful to observe, for the first time, the true muonium state.
↳ hep-phhep-exnucl-thPRC(2020)·24 citations
15
Proton structure from a light-front Hamiltonian
Chandan Mondal. Siqi Xu · Jiangshan Lan · Xingbo Zhao · Yang Li · Dipankar Chakrabarti · James P. Vary
We obtain the electromagnetic form factors, the axial form factor, and the parton distribution functions of the proton from the eigenstates of a light-front effective Hamiltonian in the leading Fock representation suitable for low-momentum scale applications. The electromagnetic and the axial form factors are found to be in agreement with the available experimental data. The unpolarized, the helicity, and the transversity valence quark distributions, after QCD evolution, are consistent with the global QCD analyses. The tensor charge also agree the experimental data, while the axial charge is somewhat outside the experimental error bar.
↳ hep-phnucl-thPRD(2020)·97 citations

Affiliations

first authorsco-authorsvia INSPIRE

Conundrum for the free energy of a holonomous gluonic plasma at cubic order

True muonium production in ultraperipheral PbPb collisions

Proton structure from a light-front Hamiltonian

Affiliations

True muonium production in ultraperipheral $P b P b$ collisions