6533b85ffe1ef96bd12c1313
RESEARCH PRODUCT
Consistent Treatment of Axions in the Weak Chiral Lagrangian.
Sophie RennerMatthias NeubertMatthias NeubertMatthias NeubertAndrea ThammMarvin SchnubelMartin Bauersubject
PhysicsQuarkParticle physics530 PhysicsBranching fractionHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologyFOS: Physical sciencesGeneral Physics and AstronomyOrder (ring theory)Context (language use)10192 Physics Institute3100 General Physics and Astronomysymbols.namesakeHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)symbolsHigh Energy Physics::ExperimentPerturbation theoryAxionLagrangiandescription
We present a consistent implementation of weak decays involving an axion or axion-like particle in the context of an effective chiral Lagrangian. We argue that previous treatments of such processes have used an incorrect representation of the flavor-changing quark currents in the chiral theory. As an application, we derive model-independent results for the decays $K^-\to\pi^- a$ and $\pi^-\to e^-\bar\nu_e a$ at leading order in the chiral expansion and for arbitrary axion couplings and mass. In particular, we find that the $K^-\to\pi^- a$ branching ratio is almost 40 times larger than previously estimated.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-02-25 | Physical review letters |