Supersymmetric contributions to weak decay correlation coefficients
Abstract
We study supersymmetric contributions to correlation coefficients that characterize the spectral shape and angular distribution for polarized {mu} and {beta}decays. In the minimal supersymmetric standard model (MSSM), oneloop box graphs containing superpartners can give rise to non(VAx(VA) fourfermion operators in the presence of leftright or flavor mixing between sfermions. We analyze the present phenomenological constraints on such mixing and determine the range of allowed contributions to the weak decay correlation coefficients. We discuss the prospective implications for future {mu} and {beta}decay experiments, and argue that they may provide unique probes of leftright mixing in the first generation scalar fermion sector.
 Authors:
 California Institute of Technology, Pasadena, California 91125 (United States)
 Publication Date:
 OSTI Identifier:
 21020311
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.75.075017; (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; ANGULAR DISTRIBUTION; BETA DECAY; BETA PARTICLES; CORRELATIONS; FIELD OPERATORS; FLAVOR MODEL; MUONS; POLARIZATION; STANDARD MODEL; SUPERSYMMETRY
Citation Formats
Profumo, S., RamseyMusolf, M. J., and Tulin, S. Supersymmetric contributions to weak decay correlation coefficients. United States: N. p., 2007.
Web. doi:10.1103/PHYSREVD.75.075017.
Profumo, S., RamseyMusolf, M. J., & Tulin, S. Supersymmetric contributions to weak decay correlation coefficients. United States. doi:10.1103/PHYSREVD.75.075017.
Profumo, S., RamseyMusolf, M. J., and Tulin, S. Sun .
"Supersymmetric contributions to weak decay correlation coefficients". United States.
doi:10.1103/PHYSREVD.75.075017.
@article{osti_21020311,
title = {Supersymmetric contributions to weak decay correlation coefficients},
author = {Profumo, S. and RamseyMusolf, M. J. and Tulin, S.},
abstractNote = {We study supersymmetric contributions to correlation coefficients that characterize the spectral shape and angular distribution for polarized {mu} and {beta}decays. In the minimal supersymmetric standard model (MSSM), oneloop box graphs containing superpartners can give rise to non(VAx(VA) fourfermion operators in the presence of leftright or flavor mixing between sfermions. We analyze the present phenomenological constraints on such mixing and determine the range of allowed contributions to the weak decay correlation coefficients. We discuss the prospective implications for future {mu} and {beta}decay experiments, and argue that they may provide unique probes of leftright mixing in the first generation scalar fermion sector.},
doi = {10.1103/PHYSREVD.75.075017},
journal = {Physical Review. D, Particles Fields},
number = 7,
volume = 75,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}

We present a new contribution of the Rparityviolating (R/{sub p}) supersymmetry (SUSY) to neutrinoless double beta decay (0{nu}{beta}{beta}) via the pion exchange between decaying neutrons. The pion coupling to the final state electrons is induced by the R/{sub p} SUSY interactions. We have found this pionexchange mechanism to dominate over the conventional twonucleon one. The latter corresponds to direct interaction between quarks from two decaying neutrons without any light hadronic mediator like {pi} meson. The constraints on the certain R/{sub p} SUSY parameters are extracted from the current experimental 0{nu}{beta}{beta}decay halflife limit. These constraints are significantly stronger than those previouslymore »

Supersymmetric contributions to the decay of an extra Z boson
We analyze in detail the supersymmetric contributions to the decay of an extra Z boson in effective rank 5 models, including the important effect of D terms on sfermion masses. The inclusion of supersymmetric decay channels will reduce the Z{sup {prime}} branching ratio to standard model particles, resulting in lower Z{sup {prime}} mass limits than those often quoted. In particular, the supersymmetric parameter space motivated by the recent Fermilab ee{gamma}{gamma} event and other suggestive evidence results in a branching fraction B(Z{sup {prime}}{r_arrow}e{sup +}e{sup {minus}}){approx_equal}2{endash}4{percent}. The expected cross sections and branching ratios could give a few events in the present datamore » 
New contributions to neutrinoless doublebeta decay in supersymmetric theories
In supersymmetric theories with Rparity violation, there are new contributions to neutrinoless doublebeta ((..beta beta..)/sub 0//sub ..nu../) decay that do not involve the exchange of Majorana neutrinos. Experimental information on (..beta beta..)/sub 0//sub ..nu../ decay can therefore be used to constrain parameters of supersymmetric theories. We also discuss neutrino mass in these theories. We then discuss how Rparityviolating interactions can be induced in the lowenergy sector of a theory that respects Rparity conservation prior to symmetry breaking. 
Supersymmetric decay widths of weak bosons
The partial widths of W and Z decays to supersymmetric particles are evaluated in the simplest N = 1 supergravity model. The total widths can be 50% greater than the standardmodel predictions. Measurements of the widths at the pbarp collider can thereby be used either to place improved lower limits on gaugino, scalarquark, and scalarlepton masses or to provide indirect evidence for supersymmetry.