Magnetic field driven enhancement of the weak decay width of charged pions
We study the effect of a uniform magnetic field B<sup>→</sup> on the decays π⁻ → l⁻ ν⁻<sub>l</sub>, 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)...
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| Autores principales: | , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2020
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/124141 |
| Aporte de: |
| Sumario: | We study the effect of a uniform magnetic field B<sup>→</sup> on the decays π⁻ → l⁻ ν⁻<sub>l</sub>, 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. |
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