4 research outputs found
Probing Lepton Flavor Violation Signal Induced by R-violating Minimal Supersymmetric Standard Model at a Linear Collider
The lepton-flavor violation (LFV) effect at an linear collider (LC),
in the frame of R-parity violating minimal supersymmetric standard model is
studied. We take the R-parity violating processes
as signal, and define the summation of the two processes as ``experiment''
observable. We find that the cross-section summation can reach
in the parameter space without sneutrino resonance
effect(). The summation treatment manifests
uniform differential distribution on , where denotes the
polar angles of both outgoing respectively to incoming electron beam
in two signal processes. The uniform feature together with collinearity
would help to reduce the SM background dramatically. Consequently we conclude
that at a LC with annual luminosity, it's either
possible to detect the distinctive R-violating LFV signal, or exclude
sneutrino to at 95% CL in the machine's biennial
runtime interval.Comment: 14 pages, 9 figure
Probing bilinear R-parity violating supergravity at the LHC
We study the collider phenomenology of bilinear R-parity violating
supergravity, the simplest effective model for supersymmetric neutrino masses
accounting for the current neutrino oscillation data. At the CERN Large Hadron
Collider the center-of-mass energy will be high enough to probe directly these
models through the search for the superpartners of the Standard Model (SM)
particles. We analyze the impact of R-parity violation on the canonical
supersymmetry searches - that is, we examine how the decay of the lightest
supersymmetric particle (LSP) via bilinear R-parity violating interactions
degrades the average expected missing momentum of the reactions and show how
this diminishes the reach in the 'usual' channels for supersymmetry searches.
However, the R-parity violating interactions lead to an enhancement of the
final states containing isolated same-sign di-leptons and trileptons,
compensating the reach loss in the fully inclusive channel. We show how the
searches for displaced vertices associated to LSP decay substantially increase
the coverage in supergravity parameter space, giving the corresponding reaches
for two reference luminosities of 10 and 100 fb and compare with those
of the R-parity conserving minimal supergravity model.Comment: Corrected version. To appear at JHE
How large could the R-parity violating couplings be?
We investigate in detail the predictions coming from the d=4 operators for
proton decay. We find the most general constraints for the R-parity violating
couplings coming from proton decay, taking into account all fermion mixing and
in different supersymmetric scenarios.Comment: 8 pages, several corrections, to appear in J.Phys.G (2005