%0 Journal Article
%T Magnetic field driven enhancement of the weak decay width of charged pions
%A Coppola, M.
%A Gomez Dumm, D.
%A Noguera, S.
%A Scoccola, N. N.
%J Journal of High Energy Physics
%D 2020
%V 09
%N 9
%I Springer
%@ 1029-8479
%G English
%F Coppola_etal2020
%O WOS:000570908100001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4534), last updated on Fri, 02 Oct 2020 07:33:51 +0000
%X 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.
%K QCD Phenomenology
%R 10.1007/JHEP09(2020)058
%U https://arxiv.org/abs/1908.10765
%U https://doi.org/10.1007/JHEP09(2020)058
%P 058-19pp