scholarly journals The  -Meson Mass Shift in Medium Using a Chiral Effective Lagrangian

2006 ◽  
Vol 115 (2) ◽  
pp. 381-409
Author(s):  
H. Kuwabara
Keyword(s):  
Mass Shift ◽  
Meson Mass ◽  
Effective Lagrangian

scholarly journals Skyrmions, half-skyrmions and nucleon mass in dense baryonic matter

2014 ◽  
Vol 29 ◽  
pp. 1460238 ◽  
Author(s):  
Yong-Liang Ma ◽  
Masayasu Harada ◽  
Hyun Kyu Lee ◽  
Yongseok Oh ◽  
Mannque Rho
Keyword(s):  
Crucial Role ◽  
Decay Constant ◽  
Effective Field ◽  
Chiral Expansion ◽  
Meson Mass ◽  
Pion Decay ◽  
Baryonic Matter ◽  
Pion Decay Constant ◽  
Effective Lagrangian ◽  
Holographic Qcd

We explore the hadron properties in dense baryonic matter in a unified way by using a Skyrme model constructed with an effective Lagrangian which includes the ρ and ω vector mesons as hidden gauge bosons and is valid up to O(p4) in chiral expansion including the homogeneous Wess-Zumino terms. With the two input values of pion decay constant and the lowest lying vector meson mass which can be fixed in free space, all the other low energy constants in the effective Lagrangian are determined by their master formulas derived from holographic QCD models, which allows us to study the baryonic matter properties with no additional free parameters and thus without ambiguities. We find that the ω field that figures in the homogeneous Wess-Zumino term plays a crucial role in the skyrmion structure and its matter properties. The most striking and intriguing observation is that the pion decay constant that smoothly drops with increasing density in the Skyrmion phase stops decreasing at n1/2 at which the skyrmions in medium fractionize into half-skyrmions and remains nearly constant in the half-skyrmion phase. In accordance with the large Nc consideration, the baryon mass also stays non-scaling in the half-skyrmion phase. This feature is supported by the nuclear effective field theory with the parameters of the Lagrangian scaling modified at the skyrmion–half-skyrmion phase transition. Our exploration also uncovers the crucial role of the ω meson in multi-baryon systems as well as in the structure of a single skyrmion.

EFFECTIVE VECTOR MESON MASSES IN A CUTOFF FIELD THEORY

2000 ◽  
Vol 09 (02) ◽  
pp. 169-183 ◽  
Author(s):  
KATSUAKI SAKAMOTO ◽  
MANABU NAKAI ◽  
HIROAKI KOUNO ◽  
AKIRA HASEGAWA ◽  
MASAHIRO NAKANO
Keyword(s):  
Field Theory ◽  
Mass Formula ◽  
High Energy ◽  
Low Energy ◽  
Meson Mass ◽  
Normal Density ◽  
Effective Masses ◽  
Effective Lagrangian ◽  
Cutoff Dependence ◽  
Energy Quantum

Based on quantum hadrodynamics with a finite cutoff, the effective masses of vector mesons (ω,ρ) in nuclear medium are calculated. We use a low-energy effective Lagrangian which is obtained by integrating high-energy quantum fluctuations. Although we use an artificial cutoff, the cutoff-dependence can be removed order by order. It is also found that the effective ρ-meson mass [Formula: see text] decreases as the density increases. The rate of the decrease becomes smaller at high density. As a result, at the normal density, [Formula: see text] is 0.85~0.92.

ρ-Meson Mass Shift in Photoproduction Processes

1970 ◽  
Vol 2 (9) ◽  
pp. 2105-2107 ◽  
Author(s):  
P. D. Mannheim ◽  
U. Maor
Keyword(s):  
Mass Shift ◽  
Meson Mass

Isoscalar-meson mass shift due to the two-gluon intermediate state

1988 ◽  
Vol 37 (7) ◽  
pp. 1957-1962 ◽  
Author(s):  
Walter S. Jaronski ◽  
Chris Long
Keyword(s):  
Intermediate State ◽  
Mass Shift ◽  
Meson Mass

THE ROLE OF ISOVECTOR MESON EXCHANGES TO NUCLEON–NUCLEON ELASTIC CROSS-SECTION

2003 ◽  
Vol 18 (38) ◽  
pp. 2713-2723 ◽  
Author(s):  
QINGFENG LI ◽  
ENGUANG ZHAO
Keyword(s):  
Cross Sections ◽  
Transport Theory ◽  
Nucleon Nucleon ◽  
Elastic Cross Section ◽  
Coupling Constants ◽  
Meson Mass ◽  
Nuclear System ◽  
Proton Proton ◽  
Effective Lagrangian

The contributions of δ-isovector-scalar and ρ-isovector-vector meson-exchanges to nucleon–nucleon elastic cross-sections (ECS) are studied based on QHD-type effective Lagrangian within the framework of the RBUU transport theory. The detailed expressions of ECS for symmetric nuclear system have also obtained. The medium correction of ρ-meson mass and a proper symmetry energy coefficient are selected in order to fix a set of suitable coupling constants for δ and ρ exchanges with the constraint of free ECS as a function of energy. The respective δ and ρ contributions to free ECS as a function of energy are also shown and it is found they both affect the neutron–proton and neutron–neutron (proton–proton) ECS on the contrary way.

scholarly journals Explicit soft supersymmetry breaking in the heterotic M-theory B − L MSSM

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Anthony Ashmore ◽  
Sebastian Dumitru ◽  
Burt A. Ovrut
Keyword(s):  
Line Bundle ◽  
Supersymmetry Breaking ◽  
Moduli Space ◽  
Initial Conditions ◽  
Low Energy ◽  
Strongly Coupled ◽  
Hidden Sector ◽  
Effective Lagrangian ◽  
Soft Supersymmetry Breaking ◽  
M Theory

Abstract The strongly coupled heterotic M-theory vacuum for both the observable and hidden sectors of the B − L MSSM theory is reviewed, including a discussion of the “bundle” constraints that both the observable sector SU(4) vector bundle and the hidden sector bundle induced from a single line bundle must satisfy. Gaugino condensation is then introduced within this context, and the hidden sector bundles that exhibit gaugino condensation are presented. The condensation scale is computed, singling out one line bundle whose associated condensation scale is low enough to be compatible with the energy scales available at the LHC. The corresponding region of Kähler moduli space where all bundle constraints are satisfied is presented. The generic form of the moduli dependent F-terms due to a gaugino superpotential — which spontaneously break N = 1 supersymmetry in this sector — is presented and then given explicitly for the unique line bundle associated with the low condensation scale. The moduli-dependent coefficients for each of the gaugino and scalar field soft supersymmetry breaking terms are computed leading to a low-energy effective Lagrangian for the observable sector matter fields. We then show that at a large number of points in Kähler moduli space that satisfy all “bundle” constraints, these coefficients are initial conditions for the renormalization group equations which, at low energy, lead to completely realistic physics satisfying all phenomenological constraints. Finally, we show that a substantial number of these initial points also satisfy a final constraint arising from the quadratic Higgs-Higgs conjugate soft supersymmetry breaking term.

scholarly journals Effective Lagrangian for Nambu-Goldstone modes in nonequilibrium open systems

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Masaru Hongo ◽  
Suro Kim ◽  
Toshifumi Noumi ◽  
Atsuhisa Ota
Keyword(s):  
Open Systems ◽  
Effective Lagrangian ◽  
Goldstone Modes
Sign in / Sign up

Export Citation Format

Share Document