Speaker
Mr
Benedikt Vormwald
(DESY)
Description
Supersymmetry with bilinearly broken R-parity (bRPV) offers an attractive
alternative to R-parity conserved SUSY. With broken R-parity the lightest SUSY
particle is no longer stable and can decay into Standard Model particles. The
additional new bRPV terms in the Lagrangian introduce a mixing of the neutrino
and the neutralino sector, which can account for the current neutrino
oscillation data. Thus neutralinos become a probe of the neutrino sector by
studying neutralino decays, which give access to neutrino parameters at
colliders.
We will present an ILC study for the bRPV SUSY model at a centre-of-mass
energy of 500 GeV. At the ILC the neutralinos are most efficiently produced in
the direct process e+e- -> chi_1^0 chi_1^0. This production mode offers a very
clean environment to study the subsequent neutralino decay, which typically
involves a W/Z and a lepton. For the analysis, realistic beam parameters were
taken into account and a full detector simulation of the International Large
Detector (ILD) was performed for the signal and background samples.
It will be shown that the achievable precision of the neutralino mixing
angle sin^2(theta_23) from measuring the neutralino branching fractions
BR(chi_1^0 -> W mu) and BR(chi_1^0 -> W tau) at the ILC is comparable to the
current uncertainties from neutrino experiments.
Primary author
Mr
Benedikt Vormwald
(DESY)
