R-parity violation, sneutrino mixing phenomena, and CP violation in p{bar p}{r_arrow}{tilde {nu}}{r_arrow}l{sup +}l{sup {minus}}+X
- Physics Department, University of California, Riverside, California 92521 (United States)
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
The sneutrino resonance reactions p{bar p}{r_arrow}{tilde {nu}}+X{r_arrow}l{sup +}l{sup {minus}}+X, for l=e,{mu},{tau}, in the MSSM without R-parity are considered. We perform a cross-section analysis and show that present limits on some products of R{sub P} couplings in the sneutrino sector can be significantly improved in future upgraded Fermilab Tevatron runs. Furthermore, we introduce CP-violating and CP-conserving {tau}-spin asymmetries which are generated already at the {ital tree level} in the reaction p{bar p}{r_arrow}{tilde {nu}}+X{r_arrow}{tau}{sup +}{tau}{sup {minus}}+X if there is {tilde {nu}}{sup {mu}}-{nu}&dbartil;{sup {mu}} mixing and that vanish in the SM. We find, for example, that for muon-sneutrino masses in the range 150 GeV{approx_lt}m{sub {tilde {nu}}{sup {mu}}}{approx_lt}450 GeV, these spin asymmetries reach {approximately}20{endash}30{percent} and {approximately}10{percent} for mass splitting between the muon-sneutrino CP-odd and CP-even states at the level of {Delta}m{approximately}{Gamma} and {Delta}m{approximately}{Gamma}/4, respectively, where {Gamma} is the {tilde {nu}}{sup {mu}} width. Both the CP-violating and the CP-conserving spin asymmetries should be detectable in future Tevatron runs even for a heavy sneutrino with a mass {approx_lt}500 GeV. If detected, such asymmetries{emdash}being proportional to the mass splitting between the CP-even and CP-odd sneutrino states{emdash}may serve as a strong indication for the existence of the sneutrino mixing phenomenon. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 308261
- Journal Information:
- Physical Review, D, Vol. 59, Issue 5; Other Information: PBD: Mar 1999
- Country of Publication:
- United States
- Language:
- English
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