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We evaluate the Kobayashi-Maskawa (KM) matrix using a maximum-likelihood method which takes into account experimental errors on input data and "systematic errors" associated with theoretical approximations. We carefully reconsider the constraints from meson decays and mixings as well as CP...
We consider the effect of a doubly charged Higgs boson ( Δ - - ) on several processes. We find that the effective Hamiltonian that is normally used to interpret the results of muonium-antimuonium oscillation experiments also describes the t -channel exchange of a Δ - - . A limit on the...
It is shown that in order to explain the ratios x and y of the helicity amplitudes for the process J ψ → γ + f 2 ( 1270 ) and the experimental datum R = B ( ψ ′ ( 3685 ) → γ + f 2 ( 1270 ) ) B ( J ψ → γ + f 2 ( 1270 ) ) = ( 9 ± 3 ) % in terms of the mixture between the meson f 2 (...
A formalism for analyzing spin correlations in multibody decays of Λ c is presented. It is a generalization of the α , β , γ formalism used to two-body hyperon decays. Application to semileptonic Λ c decays and to a few nonleptonic decays are also discussed.
The radiative decays of the ground S -wave and the first excited P -wave mesons in light-quark q q ¯ systems are investigated in the covariant oscillator quark model. An important feature of this scheme is that the effective electromagnetic currents for respective processes, which are manifestly...
We evaluate the rate of pair production in a uniform electric field confined to a bounded region in space. Using the Balian-Bloch expansion of Green's functions we obtain explicit expressions for finite-size corrections to Schwinger's formula. The case of a time-dependent boundary, relevant to...
In the context of minimal left-right-symmetric extensions of the standard SU ( 2 ) L × U ( 1 ) model, four possible scenarios emerge depending upon the number of neutral Higgs fields that acquire nonzero vacuum expectation values. We examine these four scenarios in the case of a simple form for...
Mattis and Braaten have derived a linear relation among partial-wave amplitudes for meson-baryon reactions which is valid in the limit N c → ∞ , where N c is the number of quark colors. From this they establish the selection rule I t = J t found previously by Mattis and Mukerjee. Using the...
We show that, contrary to the situation in the vacuum, a Majorana neutrino can have electric and magnetic dipole moments in a medium. This is because of new contributions, equal for a particle and its antiparticle, that can arise only in a material background. For Dirac neutrinos, these...
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