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Title: Mass spectrum in R-parity violating minimal supergravity and benchmark points

Abstract

We investigate in detail the low-energy spectrum of the R-parity violating minimal supergravity model using the computer program softsusy. We impose the experimental constraints from the measurement of the anomalous magnetic moment of the muon, (g-2){sub {mu}}, the decay b{yields}s{gamma} as well as the mass bounds from direct searches at colliders, in particular on the Higgs boson and the lightest chargino. We also include a new calculation for the R-parity violating contribution to Br(B{sub s}{yields}{mu}{sup +}{mu}{sup -}). We then focus on cases where the lightest neutralino is not the lightest supersymmetric particle (LSP). In this region of parameter space either the lightest scalar tau (stau) or the scalar tau neutrino (tau sneutrino) is the LSP. We suggest four benchmark points with typical spectra and novel collider signatures for detailed phenomenological analysis and simulation by the LHC collaborations.

Authors:
; ; ; ;  [1];  [2];  [3];  [3]
  1. DAMTP, University of Cambridge, Cambridge (United Kingdom)
  2. (Germany)
  3. (United Kingdom)
Publication Date:
OSTI Identifier:
21011005
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevD.75.035002; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B QUARKS; B S MESONS; BRANCHING RATIO; CERN LHC; COMPUTERIZED SIMULATION; HIGGS BOSONS; MAGNETIC MOMENTS; MASS SPECTRA; MUONS MINUS; PARITY; PARTICLE DECAY; PHOTONS; S CODES; S QUARKS; SPARTICLES; SUPERGRAVITY; TAU NEUTRINOS

Citation Formats

Allanach, B. C., Bernhardt, M. A., Dreiner, H. K., Kom, C. H., Richardson, P., Physics Institute, University of Bonn, Bonn, DAMTP, University of Cambridge, Cambridge, and IPPP, University of Durham, Durham. Mass spectrum in R-parity violating minimal supergravity and benchmark points. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.035002.
Allanach, B. C., Bernhardt, M. A., Dreiner, H. K., Kom, C. H., Richardson, P., Physics Institute, University of Bonn, Bonn, DAMTP, University of Cambridge, Cambridge, & IPPP, University of Durham, Durham. Mass spectrum in R-parity violating minimal supergravity and benchmark points. United States. doi:10.1103/PHYSREVD.75.035002.
Allanach, B. C., Bernhardt, M. A., Dreiner, H. K., Kom, C. H., Richardson, P., Physics Institute, University of Bonn, Bonn, DAMTP, University of Cambridge, Cambridge, and IPPP, University of Durham, Durham. Thu . "Mass spectrum in R-parity violating minimal supergravity and benchmark points". United States. doi:10.1103/PHYSREVD.75.035002.
@article{osti_21011005,
title = {Mass spectrum in R-parity violating minimal supergravity and benchmark points},
author = {Allanach, B. C. and Bernhardt, M. A. and Dreiner, H. K. and Kom, C. H. and Richardson, P. and Physics Institute, University of Bonn, Bonn and DAMTP, University of Cambridge, Cambridge and IPPP, University of Durham, Durham},
abstractNote = {We investigate in detail the low-energy spectrum of the R-parity violating minimal supergravity model using the computer program softsusy. We impose the experimental constraints from the measurement of the anomalous magnetic moment of the muon, (g-2){sub {mu}}, the decay b{yields}s{gamma} as well as the mass bounds from direct searches at colliders, in particular on the Higgs boson and the lightest chargino. We also include a new calculation for the R-parity violating contribution to Br(B{sub s}{yields}{mu}{sup +}{mu}{sup -}). We then focus on cases where the lightest neutralino is not the lightest supersymmetric particle (LSP). In this region of parameter space either the lightest scalar tau (stau) or the scalar tau neutrino (tau sneutrino) is the LSP. We suggest four benchmark points with typical spectra and novel collider signatures for detailed phenomenological analysis and simulation by the LHC collaborations.},
doi = {10.1103/PHYSREVD.75.035002},
journal = {Physical Review. D, Particles Fields},
number = 3,
volume = 75,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}
  • No abstract prepared.
  • Within the framework of an R-parity violating minimal supergravity model, at least three relatively large lepton number violating {lambda}{sup '} type trilinear couplings at the grand unified theory scale, not directly related to neutrino physics, can naturally generate via renormalization group evolution and/or CKM rotation, the highly suppressed bilinear and trilinear parameters at the weak scale required to explain the neutrino oscillation data. The structure of the renormalization group equations and the CKM matrix restrict the choices of the three input couplings to only eight possible combinations, each with its own distinctive experimental signature. The relatively large input couplings maymore » lead to spectacular low-energy signatures like rare weak decays of the {tau} lepton and K mesons, direct lepton number violating decays of several sparticles, and unconventional decay modes (and reduced lifetime) of the lightest neutralino, assumed to be the lightest supersymmetric particle, all with sizable branching ratios. Several low background signals at the Tevatron and CERN LHC have been suggested and their sizes are estimated to be at the observable level. From the particle content of the signal and the relative rate of different final states the input couplings at the grand unified theory scale, i.e., the origin of neutrino masses and mixing angles, can be identified.« less
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  • We show that the present experimental limits on electron-nucleon interactions that violate both parity and time reversal invariance provide new stringent bounds on the imaginary parts of some of the products of the R-parity-violating coupling constants in the R-parity-violating minimal supersymmetric standard model. (c) 2000 The American Physical Society.
  • In a variety of models of neutrino masses and mixings the lighter top squark decays into competing R-parity violating and R-parity conserving channels. Using PYTHIA we have estimated in a model independent way the minimum value of P{identical_to}BR(t-tilde){sub 1}{yields}c{chi}-tilde{sub 1}{sup 0})xBR(t-tilde){sub 1}{yields}l{sub i}{sup +}b), where l{sub i}=e{sup +} and {mu}{sup +}, corresponding to an observable signal involving the final state 1l+jets+Ee{sub T} (carried by the neutrinos from the {chi}-tilde{sub 1}{sup 0} decay) at Tevatron Run II. For the kinematical cuts designed in this paper P depends on m{sub t-tilde{sub 1}} only. We then compute P for representative choices of themore » model parameters constrained by the oscillation data and find that over a significant region of the allowed parameter space P is indeed larger than P{sub min}. This signal is complementary to the dilepton+dijet signal studied in several earlier experimental and phenomenological analyses and may be observed even if BR(t-tilde){sub 1}{yields}l{sub i}{sup +}b) is an order of magnitude smaller than BR(t-tilde{sub 1}{yields}c{chi}-tilde{sub 1}{sup 0}). The invariant mass distribution of the hardest lepton and the hardest jet may determine m{sub t-tilde{sub 1}} and reveal the lepton number violating nature of the underlying interaction. The invariant mass distribution of the two lowest energy jets may determine m{sub {chi}}{sub -tilde{sub 1}{sup 0}}.« less