0000000000234620

AUTHOR

Jan Stern

showing 2 related works from this author

Lepton-number violation and right-handed neutrinos in Higgs-less effective theories

2005

Following previous work, we identify a symmetry S_nat that generalizes the concept of custodial symmetry, keeping under control deviations from the Standard Model (SM). To realize S_nat linearly, the space of gauge fields has to be extended. Covariant constraints formulated in terms of spurions reduce S_nat back to SU(2)_L x U(1)_Y. This allows for a covariant introduction of explicit S_nat-breaking parameters. We assume that S_nat is at play in a theory of electroweak symmetry-breaking without a light Higgs particle. We describe some consequences of this assumption, using a non-decoupling effective theory in which the loop expansion procedure is based on both momentum and spurion power cou…

PhysicsNuclear and High Energy PhysicsParticle physicsChiral perturbation theory010308 nuclear & particles physicsElectroweak interactionHigh Energy Physics::PhenomenologyFOS: Physical sciences01 natural sciencesLepton numberCustodial symmetryStandard ModelHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]0103 physical sciencesEffective field theoryHiggs bosonSymmetry breaking010306 general physics
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Dispersive analysis ofKLμ3andKLe3scalar and vector form factors using KTeV data

2010

Using the published KTeV samples of K{sub L} {yields} {pi}{sup {+-}}e{sup {-+}}{nu} and K{sub L} {yields} {pi}{sup {+-}}{mu}{sup {-+}}{nu} decays, we perform a reanalysis of the scalar and vector form factors based on the dispersive parameterization. We obtain phase space integrals I{sub K}{sup e} = 0.15446 {+-} 0.00025 and I{sub K}{sup {mu}} = 0.10219 {+-} 0.00025. For the scalar form factor parameterization, the only free parameter is the normalized form factor value at the Callan-Treiman point (C); our best fit results in ln C = 0.1915 {+-} 0.0122. We also study the sensitivity of C to different parametrizations of the vector form factor. The results for the phase space integrals and C a…

PhysicsNuclear and High Energy PhysicsAntiparticleParticle physicsMuonMeson010308 nuclear & particles physicsHadronScalar (mathematics)Elementary particle01 natural sciencesParticle decay0103 physical sciencesAtomic physics010306 general physicsDimensionless quantityPhysical Review D
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