نتایج جستجو برای: lepton
تعداد نتایج: 9322 فیلتر نتایج به سال:
. We have searched for a heavy charged lepton with an associated neutrino of nearly the same mass in e+eannihilation data taken with the Mark II detector at a centerof-mass energy of 29 GeV. In order to suppress contamination from conventional two.photon reactions, this analysis uses a novel, radiative-tagging technique. Requiring . the presence of an isolated, energetic photon allows a search ...
We report new direct measurements of the Z-lepton coupling asymmetry parameters Ae, A and A , with polarized Z 's collected by the SLD detector at the SLAC Linear Collider. The parameters are extracted from the measurement of the left-right-forward-backward asymmetries for each lepton species. The 1996, 1997 and 1998 SLD runs are included in this analysis and combined with published data from t...
We discuss the constraints of lepton mixing angles from lepton number violating processes such as neutrinoless double beta decay, μ-e conversion and K decay, K− → πμμ which are allowed only if neutrinos are Majorana particles. The rates of these processes are proportional to the averaged neutrino mass defined by 〈mν〉ab ≡ | ∑3 j=1 UajUbjmj | in the absence of right-handed weak coupling. Here a, ...
As pointed out by many authors, recent observations are consistent with an intriguing relation between the Cabibbo angle θC and the solar neutrino mixing angle θ12, namely θ12 ≃ π/4 − θC. Such quark-lepton complementarity (QLC) may be a signal of an underlying quark-lepton unification at short distances. We discuss possible ways to realize this relation in realistic quark-lepton unification the...
ÐMeasurement of lepton contamination is achieved across a radiotherapy photon beam and peripheral doses using radiochromic ®lm. An extrapolation technique is used where several layers are suspended in air to measure incident contamination without the eects of phantom scatter. Surface dose was measured as 11% of Dmax for 6 MV beams at central axis and 9% for 10 MV photons for a 10 10 cm ®eld si...
We present a model of weak scale dark matter (DM) where the thermal DM density is set by the lepton asymmetry due to the presence of higher dimension lepton violating operators. In these models there is generically a separation between the annihilation cross section responsible for the relic abundance (through lepton violating operators) and the annihilation cross section that is relevant for t...
ar X iv : h ep - p h / 99 06 43 3 v 2 2 9 O ct 1 99 9 SO ( 10 ) GUT and Quark - Lepton Mass Matrices
The phenomenological model that all quark and lepton mass matrices have the same zero texture, namely their (1,1), (1,3) and (3,1) components are zeros, is discussed in the context of SO(10) Grand Unified Theories (GUTs). The mass matrices of type I for quarks are consistent with the experimental data in the quark sector. For the lepton sector, consistent fitting to the data of neutrino oscilla...
The nonlinear spinorfield with Heisenberg's dipole regularization is interpreted as a leptonquark system. In Section 1, a nonlinear spinorfield equation for two lepton-quark generations is derived by physical arguments and the Heisenberg dipole regularization is formulated for this model. In Section 2, corresponding dynamical equations for local fermion and local boson states are deduced by mea...
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