TY  - JOUR
AU  - Coppola, M.
AU  - Gomez Dumm, D.
AU  - Noguera, S.
AU  - Scoccola, N. N.
PY  - 2019
DA  - 2019//
TI  - Pion-to-vacuum vector and axial vector amplitudes and weak decays of pions in a magnetic field
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 054031
EP  - 18pp
VL  - 99
IS  - 5
PB  - Amer Physical Soc
AB  - We propose a model-independent parametrization for the one-pion-to-vacuum matrix elements of the vector and axial vector hadronic currents in the presence of an external uniform magnetic field. It is shown that, in general, these hadronic matrix elements can be written in terms of several gauge covariant Lorentz structures and form factors. Within this framework we obtain a general expression for the weak decay pi(- )-> l(nu)over bar(l) and discuss the corresponding limits of strong and weak external magnetic fields.
SN  - 2470-0010
UR  - https://arxiv.org/abs/1810.08110
UR  - https://doi.org/10.1103/PhysRevD.99.054031
DO  - 10.1103/PhysRevD.99.054031
LA  - English
N1  - WOS:000462915500003
ID  - Coppola_etal2019
ER  -