TY  - JOUR
AU  - Coppola, M.
AU  - Gomez Dumm, D.
AU  - Noguera, S.
AU  - Scoccola, N. N.
PY  - 2020
DA  - 2020//
TI  - Magnetic field driven enhancement of the weak decay width of charged pions
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 058
EP  - 19pp
VL  - 09
IS  - 9
PB  - Springer
KW  - 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.
SN  - 1029-8479
UR  - https://arxiv.org/abs/1908.10765
UR  - https://doi.org/10.1007/JHEP09(2020)058
DO  - 10.1007/JHEP09(2020)058
LA  - English
N1  - WOS:000570908100001
ID  - Coppola_etal2020
ER  -