منابع مشابه
Proton Decay and Realistic Models of Quark and Lepton Masses
It is shown that in realistic SUSY GUT models of quark and lepton masses both the proton decay rate and branching ratios differ in general from those predicted in the minimal SU(5) supersymmetric model. The observation of proton decay, and in particular the branching ratio B[(p → π+ν)/(p → K+ν)], would thus allow decisive tests of these fermion mass schemes. It is shown that the charged lepton ...
متن کاملProton decay
The status of proton decay is described, including general motivations for baryon number violation, and the present and future experimental situation. Grand unification with and without supersymmetry is considered, including possible evidence from coupling constant unification and implications for proton decay and neutrino mass. 1 Motivations Baryon number is almost certainly not absolutely con...
متن کاملProton Decay
We discuss the status of supersymmetric grand unified theories [SUSY GUTs] with regards to the observation of proton decay. In this talk we focus on SUSY GUTs in 4 dimensions. We outline the major theoretical uncertainties present in the calculation of the proton lifetime and then present our best estimate of an absolute upper bound on the predicted proton lifetime. Towards the end, we consider...
متن کاملZ0 decay into charmonium via charm quark fragmentation.
In decays of the Z, the dominant mechanism for the direct production of charmonium states is the decay of the Z into a charm quark or antiquark followed by its fragmentation into the charmonium state. We calculate the fragmentation functions describing the splitting of charm quarks into S-wave charmonium states to leading order in the QCD coupling constant. Leading logarithms of MZ/mc are summe...
متن کاملProton-Proton Fusion and Tritium β Decay from Lattice Quantum Chromodynamics.
The nuclear matrix element determining the pp→de^{+}ν fusion cross section and the Gamow-Teller matrix element contributing to tritium β decay are calculated with lattice quantum chromodynamics for the first time. Using a new implementation of the background field method, these quantities are calculated at the SU(3) flavor-symmetric value of the quark masses, corresponding to a pion mass of m_{...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1982
ISSN: 0556-2821
DOI: 10.1103/physrevd.26.3092