6533b872fe1ef96bd12d3146
RESEARCH PRODUCT
Magnetic field driven enhancement of the weak decay width of charged pions
S. NogueraDaniel Gómez DummN. N. ScoccolaM. Coppolasubject
PhysicsNuclear and High Energy Physics010308 nuclear & particles physicsHigh Energy Physics - Lattice (hep-lat)FísicaFOS: Physical sciences//purl.org/becyt/ford/1.3 [https]QCD Phenomenology7. Clean energy01 natural sciencesMagnetic fieldNuclear physics//purl.org/becyt/ford/1 [https]High Energy Physics - PhenomenologyPionHigh Energy Physics - LatticeHigh Energy Physics - Phenomenology (hep-ph)0103 physical scienceslcsh:QC770-798lcsh:Nuclear and particle physics. Atomic energy. RadioactivityHigh Energy Physics::Experiment010306 general physicsCiencias Exactasdescription
We study the effect of a uniform magnetic field B→ on the decays π⁻ → l⁻ ν⁻l, where l⁻ = e⁻, μ⁻, carrying out a general analysis that includes four π⁻ 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 ∼ 10 for eB = 0.1 GeV² up to ∼ 10³ 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-09-01 |