12,106 research outputs found
Photon Signatures for Low Energy Supersymmetry Breaking and Broken R-parity
The possible phenomenological consequences of R-parity violating interactions
in the framework of low energy supersymmetry breaking are studied. It is
pointed out that even very weak R-parity violation would completely overshadow
one of the basic signatures of low energy supersymmetry breaking models, that
is, the decay of the next to lightest supersymmetric particle into a photon
(lepton) and missing energy. Thus, the observation of these decays would put
very strong limits on R-parity violating couplings. Vice-versa, if R-parity
violation is established experimentally, before a detailed knowledge of the
spectrum is obtained, it will be very difficult to distinguish gravity mediated
from low energy gauge mediated supersymmetry breaking. Those conclusions are
very model independent. We also comment on the possibility of mixing between
charged and neutral leptons with charginos and neutralinos, respectively, and
its phenomenological consequences for the photon (lepton) signatures, in
scenarios where this mixing is generated by the presence of bilinear or
trilinear R-parity violating terms in the superpotential.Comment: 12 pages, Late
Updating Bounds on -Parity Violating Supersymmetry from Meson Oscillation Data
We update the bounds on -parity violating supersymmetry originating from
meson oscillations in the and systems. To this end, we
explicitly calculate all corresponding contributions from -parity violating
operators at the one-loop level, thereby completing and correcting existing
calculations. We apply our results to the derivation of bounds on -parity
violating couplings, based on up-to-date experimental measurements. In
addition, we consider the possibility of cancellations among flavor-changing
contributions of various origins, e.g. from multiple -parity violating
couplings or -parity conserving soft terms. Destructive interferences among
new-physics contributions could then open phenomenologically allowed regions,
for values of the parameters that are naively excluded when the parameters are
varied individually.Comment: 53 pages, 10 figures, 2 tables; final versio
R-parity violating two-loop level rainbowlike contribution to the fermion electric dipole moment
We analyze the two-loop level R-parity violating supersymmetric contribution
to the electric and chromoelectric dipole moments of the fermion with neutrino
and gaugino in the intermediate state. It is found that this contribution can
be sufficiently enhanced with large tan {\beta} and that it can have comparable
size with the currently known R-parity violating Barr-Zee type process in the
TeV scale supersymmetry breaking. We also give new limits on the R-parity
violating couplings from the experimental data of the electric dipole moments
of the neutron and the electron.Comment: 10 pages, 9 figure
R-Parity Violation at HERA ?
We examine the possibility that the high-Q^2 events seen at HERA are due to
the production and decay of squarks of R-parity violating supersymmetry. The
relevant R-parity violating coupling(s) is identified and shown to lie between
0.03 and 0.26. Consequences of such a coupling at other experiments, such as
the LEP and Tevatron, are discussed
On Prospects for Exploration of Supersymmetry in Double Beta Decay Experiments
We analyze constraints on the parameters of the R-parity violating
supersymmetry which can be extracted from non-observation of the neutrinoless
nuclear double beta decay () at a given half-life lower bound.
Our analysis covers a large class of phenomenologically viable R-parity
violating SUSY models. We introduce special characteristics: the SUSY
sensitivity of a decaying isotope and the SUSY reach of a
experiment. The former provides a physical criterion for a
selection of the most promising isotopes for SUSY searches and the latter gives
a measure of success for a experiment in exploring the
R-parity violating SUSY parameter space. On this basis we discuss prospects for
exploration of supersymmetry in various experiments.Comment: 11 pages, 5 Postscript figures. Modified and updated version is
printed also in Proc. of NANP97 (JINR, Dubna, July 7--11, 1997): Phys. Atom
Nucl, 1998, 61, vol. 6, p.1092--109
Searches for Prompt -Parity-Violating Supersymmetry at the LHC
Searches for supersymmetry (SUSY) at the LHC frequently assume the
conservation of -parity in their design, optimization and interpretation. In
the case that -parity is not conserved, constraints on SUSY particle masses
tend to be weakened with respect to -parity-conserving models. We review the
current status of searches for -parity-violating (RPV) supersymmetry models
at the ATLAS and CMS experiments, limited to 8 TeV search results published or
submitted for publication as of the end of March 2015. All forms of
renormalisable RPV terms leading to prompt signatures have been considered in
the set of analyses under review. Discussing results for searches for prompt
R-parity-violating SUSY signatures summarizes the main constraints for various
RPV models from LHC Run I and also defines the basis for promising signal
regions to be optimized for Run II. In addition to identifying highly
constrained regions from existing searches, also gaps in the coverage of the
parameter space of RPV SUSY are outlined
Search for R-Parity Violating Supersymmetry at the CMS Experiment
The latest results from CMS on R-Parity violating Supersymmetry based on the
19.5/fb full dataset from the 8 TeV LHC run of 2012 are reviewed. The results
are interpreted in the context of simplified models with multilepton and
b-quark jets signatures that have low missing transverse energy arising from
light top-squark pair with R-parity-violating decays of the lightest
supersymmetric particle. In addition to simplified model, a new approach for
phenomenological MSSM interpretation is shown which demonstrates that the
obtained results from multilepton final states are valid for a wide range of
supersymmetry models.Comment: 6 pages, 10 figures, EPS-2013 July 17-24, Stockholm, Swede
R-parity Violating Supersymmetry at IceCube
The presence of -parity violating (RPV) supersymmetric interactions
involving high-energy neutrinos can lead to resonant production of TeV-scale
squarks inside large-volume neutrino detectors. Using the ultra-high energy
neutrino events observed recently at the IceCube, with the fact that for a
given power-law flux of astrophysical neutrinos, there is no statistically
significant deviation in the current data from the Standard Model expectations,
we derive robust upper limits on the RPV couplings as a function of the
resonantly-produced squark mass, independent of the other unknown model
parameters, as long as the squarks decay dominantly to 2-body final states
involving leptons and quarks through the RPV couplings. With more statistics,
we expect these limits to be comparable/complementary to the existing limits
from direct collider searches and other low-energy processes.Comment: 10 pages, 4 figures; minor changes, version to appear in Phys. Lett.
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