Nuclear Theory·nucl-th

Thursday·July 9, 2015

4 papers—1 primary·3 cross-listed

02
[Submitted on 8 Jul 2015] (cross-list from hep-ph)
Investigating the nature of light scalar mesons with semileptonic decays of D mesons
Takayasu Sekihara (Osaka U., RCNP)🇯🇵 · Eulogio Oset (Valencia U. & Valencia U., IFIC)🇪🇸
We study the semileptonic decays of $D_{s}^{+}$ , $D^{+}$ , and $D^{0}$ mesons into the light scalar mesons [ $f_{0} (500)$ , $K_{0}^{*} (800)$ , $f_{0} (980)$ , and $a_{0} (980)$ ] and the light vector mesons [ $ρ (770)$ , $ω (782)$ , $K^{*} (892)$ , and $ϕ (1020)$ ]. With the help of a chiral unitarity approach in coupled channels, we compute the branching fractions for scalar meson processes of the semileptonic $D$ decays in a simple way. Using current known values of the branching fractions, we make predictions for the branching fractions of the semileptonic decay modes with other scalar and vector mesons. Furthermore, we calculate the $π^{+} π^{-}$ , $π η$ , $π K$ , and $K^{+} K^{-}$ invariant mass distributions in the semileptonic decays of $D$ mesons, which will help us clarify the nature of the light scalar mesons.
Comments:
17 pages, 11 eps figures, version accepted for publication in PRD, several references added
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1507.02026 [pdf]
PRD(2015)·64 citations
03
[Submitted on 8 Jul 2015] (cross-list from hep-ph)
Spontaneous magnetization of quark matter in the inhomogeneous chiral phase
Ryo Yoshiike🇯🇵 · Kazuya Nishiyama🇯🇵 · Tositaka Tatsumi🇯🇵
Considering the density wave of scalar and pseudoscalar condensates, we study the response of quark matter to a weak external magnetic field. In an external magnetic field, the energy spectrum of the lowest Landau level becomes asymmetric about zero, which is closely related to chiral anomaly, and gives rise to the spontaneous magnetization. This mechanism may be one of candidates for the origin of the strong magnetic field in pulsars and/or magnetars.
Comments:
4 pages, 2 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1507.02110 [pdf]
PLB(2015)·25 citations
04
[Submitted on 8 Jul 2015] (cross-list from hep-ph)
Nucleon Properties in the Quantized Linear Sigma Model at Finite Temperature and Chemical Potential
H. M. Mansour🇪🇬 · M. Abu-Shady🇪🇬
The linear sigma model at finite temperature and chemical potential is systematically studied using the coherent-pair approximation, in which fully taking quantum of fields are included. The expectation value of the chiral Hamiltonian density is minimized and the resulting equations for the nucleon are solved. The qualitative features of the quantized sigma and pion fields are strong sensitive to the change of temperature and baryonic chemical potential and are in agreement with the mean-field approximation calculations. It is noticed that the nucleon mass increases with increasing coherence parameter. In addition, the nucleon mass increases with increasing temperature and the baryonic chemical potential and then it decreases at higher values of the temperature and baryonic chemical potential. The obtained results show that the mean-square radius of the proton and the neutron increase with increasing temperature or the baryonic chemical potential and that the pion-nucleon coupling constant decreases with the temperature or chemical potential. We conclude that the coherent-pair approximation successfully give better description of the nucleon properties at finite temperature and baryonic chemical potential
Comments:
25 pages, 9 figures, 4 Tables. arXiv admin note: text overlap with arXiv:hep-ph/9809473 by other authors
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1507.02214 [pdf]
J.Phys.G(2016)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE

Investigating the nature of light scalar mesons with semileptonic decays of D mesons

Spontaneous magnetization of quark matter in the inhomogeneous chiral phase

Nucleon Properties in the Quantized Linear Sigma Model at Finite Temperature and Chemical Potential

Affiliations