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Weak decay of magnetized pions

G.S. Bali
(
- Regensburg U. and
- TIFR, Mumbai, Dept. Theor. Phys.
)
,
B.B. Brandt
(
- Frankfurt U.
)
,
G. Endrődi
(
- Frankfurt U.
)
,
B. Gläßle
(
- Tubingen U.
)

May 28, 2018

6 pages

Published in:

Phys.Rev.Lett. 121 (2018) 7, 072001

Published: Aug 15, 2018

e-Print:

1805.10971 [hep-lat]

DOI:

10.1103/PhysRevLett.121.072001

View in:

ADS Abstract Service

reference search33 citations

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Abstract: (APS)

The leptonic decay of charged pions is investigated in the presence of background magnetic fields. In this situation, Lorentz symmetry is broken, and new fundamental decay constants need to be introduced, associated with the decay via the vector part of the electroweak current. We calculate the magnetic field dependence of both the usual and a new decay constant nonperturbatively on the lattice. We employ both Wilson and staggered quarks and extrapolate the results to the continuum limit. With this nonperturbative input, we calculate the tree level electroweak amplitude for the full decay rate in strong magnetic fields. We find that the muonic decay of the charged pion is enhanced drastically by the magnetic field. We comment on possible astrophysical implications.

Note:

5+3 pages, 4 figures. v3: discussion on systematic errors extended, version accepted for publication in PRL

Elementary Particles and Fields
magnetic field: background
pi: leptonic decay
current: electroweak interaction
decay: weak interaction
magnetic field: high
quantum chromodynamics
lattice field theory
numerical calculations
quark: flavor: 3

References(44)

Figures(4)

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)
,
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(
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)
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