R-parity violation in superstring derived models
نویسنده
چکیده
The ALEPH collaboration has recently reported a significant excess of fourjet events at the LEP 1.5 and LEP 2 experiments. While not yet confirmed by the other collaborations, i t was recently proposed that this excess may be explained by certain R-parity violating operators in supersymmetric models. R-parity violating operators introduce the danger of inducing rapid proton decay. I discuss how the operators required to explain the ALEPH four jet events 8 W A d may arise from superstring derived models without inducing rapid proton d e 0 cay. & 00 d
منابع مشابه
Proton Stability and Superstring Z
Recently it was argued that proton lifetime limits impose that the scale of quantum gravity must be above 10GeV. By studying the proton stability in the context of realistic heterotic–string models, I propose that proton longevity necessitates the existence of an additional U(1)Z′ symmetry, which is of non–GUT origin and remains unbroken down to intermediate, or low, energies. It is shown that ...
متن کاملProton Stability and Superstring Z ′ Alon
Recently it was argued that proton lifetime limits impose that the scale of quantum gravity must be above 10GeV. By studying the proton stability in the context of realistic heterotic–string models, I propose that proton longevity necessitates the existence of an additional U(1)Z′ symmetry, which is of non–GUT origin and remains unbroken down to intermediate, or low, energies. It is shown that ...
متن کاملCustodial nonabelian gauge symmetries in realistic superstring derived models
A well known problem in supersymmetric models is the presence of, lepton and baryon number violating, dimension four operators. The traditional R parity solution may not be suitable if one tries to incorporate supersymmetry into a Planck scale theory. I propose a different solution in the context of realistic string models. I show that realistic string models can give rise to custodial nonabeli...
متن کاملCP in R-parity violating models
It is shown that in R-parity violating models of supersymmetry, the CP violation observed in the kaon system could arise purely from the R-parity violating scalar interactions (A-terms), with no CP violation in the CKM matrix. The direct CP violating parameter, ε, could be as large or larger than that expected in the Standard Model. CP violation in the B system however is expected to be negligi...
متن کاملRadiative W and Z Decays and Spontaneous R-Parity Violation
We point out that in a class of supersymmetric models where R-parity violation is induced by the spontaneous breaking of local B − L symmetry, the R-parity violating W decay W → l̃γ and Z decay Z → ν̃γ, forbidden in the minimal supersymmetric standard model (MSSM), occur at an enhanced rate compared to other models with R-parity breaking. We find that the branching fractions for these modes can b...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1996