scholarly journals Pion-to-vacuum vector and axial vector amplitudes and weak decays of pions in a magnetic field

2019 ◽  
Vol 99 (5) ◽  
Author(s):  
M. Coppola ◽  
D. Gomez Dumm ◽  
S. Noguera ◽  
N. N. Scoccola
Keyword(s):  
Magnetic Field ◽  
Axial Vector ◽  
Vacuum Vector ◽  
Weak Decays

scholarly journals Generalized two-point tree-level amplitude j f → j′ f′ in a magnetized medium

2015 ◽  
Vol 30 (11) ◽  
pp. 1550049 ◽  
Author(s):  
A. V. Kuznetsov ◽  
D. A. Rumyantsev ◽  
D. M. Shlenev
Keyword(s):  
Magnetic Field ◽  
Axial Vector ◽  
Field Operator ◽  
Coherent Scattering ◽  
Tree Level ◽  
Tree Level Amplitude ◽  
Photoproduction Process ◽  
Arbitrary Strength ◽  
Neutrino Emissivity ◽  
A Current

The tree-level two-point amplitudes for the transitions j f → j′ f′, where f is a fermion and j is a generalized current, in a constant uniform magnetic field of an arbitrary strength and in charged fermion plasma, for the j f f interaction vertices of the scalar, pseudoscalar, vector and axial-vector types have been calculated. The generalized current j could mean the field operator of a boson, or a current consisting of fermions, e.g. the neutrino current. The particular cases of a very strong magnetic field, and of the coherent scattering off the real fermions without change of their states (the "forward" scattering) have been analyzed. The contribution of the neutrino photoproduction process, [Formula: see text], to the neutrino emissivity has been calculated with taking account of a possible resonance on the virtual electron.

scholarly journals PHOTON-PAIR CONVERSION INTO NEUTRINOS IN A STRONG MAGNETIC FIELD

2001 ◽  
Vol 16 (25) ◽  
pp. 1659-1665 ◽  
Author(s):  
A. V. KUZNETSOV ◽  
N. V. MIKHEEV
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Strong Magnetic Field ◽  
Asymptotic Form ◽  
Axial Vector ◽  
Electroweak Interaction ◽  
The Other ◽  
The Standard Model ◽  
Loop Amplitude ◽  
The Magnetic Field

A general analysis of the three-vertex loop amplitude in a strong magnetic field, based on the asymptotic form of the electron propagator in the field, is performed. In order to investigate the photon–neutrino process [Formula: see text], the vertex combinations of the scalar–vector–vector (SVV), pseudoscalar–vector–vector (PVV), three-vector (VVV), and axial-vector–vector–vector (AVV) types are considered. It is shown that only the SVV amplitude grows linearly with the magnetic field strength, while in the other amplitudes, PVV, VVV and AVV, the linearly growing terms are canceled. The process [Formula: see text] is investigated in the left–right-symmetric extension of the standard model of electroweak interaction, where the effective scalar νν e e coupling could exist. Possible astrophysical manifestations of the considered process are discussed.

scholarly journals QCD phase diagram with a background magnetic field in an improved soft-wall AdS/QCD model

2021 ◽  
Vol 81 (6) ◽  
Author(s):  
Zhen Fang ◽  
Ying-Ying Li ◽  
Yue-Liang Wu
Keyword(s):  
Magnetic Field ◽  
Axial Vector ◽  
Vector Mesons ◽  
Magnetic Catalysis ◽  
Qcd Phase Diagram ◽  
Chiral Transition ◽  
Background Magnetic Field ◽  
Soft Wall Model ◽  
Soft Wall ◽  
Melting Properties

AbstractWe studied the magnetic effects on the chiral transition and the melting properties of vector and axial-vector mesons in the improved soft-wall AdS/QCD model under a charged magnetic background, which is solved perturbatively from an Einstein–Maxwell system with a negative cosmological constant. The phase diagrams for both chiral transition and meson melting have been obtained. We show that the inverse magnetic catalysis emerged naturally in the improved soft-wall model. We also find that the magnetic field can induce meson melting, at least for the vector and axial-vector mesons, in our holographic setup.

scholarly journals Weak decays of the axial-vector tetraquark Tbb;u¯d¯−

2019 ◽  
Vol 99 (3) ◽  
Author(s):  
S. S. Agaev ◽  
K. Azizi ◽  
B. Barsbay ◽  
H. Sundu
Keyword(s):  
Axial Vector ◽  
Weak Decays
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