PT Journal
AU Coppola, M
   Gomez Dumm, D
   Noguera, S
   Scoccola, NN
TI Magnetic field driven enhancement of the weak decay width of charged pions
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2020
BP 058
EP 19pp
VL 09
IS 9
DI 10.1007/JHEP09(2020)058
LA English
DE QCD Phenomenology
AB We study the effect of a uniform magnetic field B on the decays pi- > l- nu_l bar, where l(-)=e(-), μ(-), carrying out a general analysis that includes four pi (-) decay constants. Taking the values of these constants from a chiral effective Nambu-Jona-Lasinio (NJL) model, it is seen that the total decay rate gets strongly increased with respect to the B = 0 case, with an enhancement factor ranging from similar to 10 for eB = 0.1 GeV2 up to similar to 10(3) for eB = 1 GeV2. The ratio between electronic and muonic decays gets also enhanced, reaching a value of about 1 : 2 for eB = 1 GeV2. In addition, we find that for large B the angular distribution of outgoing antineutrinos shows a significant suppression in the direction of the magnetic field.
ER