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Title: 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), one-loop box graphs containing superpartners can give rise to non-(V-Ax(V-A) four-fermion operators in the presence of left-right 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 left-right mixing in the first generation scalar fermion sector.

Authors:
; ;  [1]
  1. 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., Ramsey-Musolf, 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., Ramsey-Musolf, M. J., & Tulin, S. Supersymmetric contributions to weak decay correlation coefficients. United States. doi:10.1103/PHYSREVD.75.075017.
Profumo, S., Ramsey-Musolf, 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 Ramsey-Musolf, 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), one-loop box graphs containing superpartners can give rise to non-(V-Ax(V-A) four-fermion operators in the presence of left-right 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 left-right 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 R-parity-violating (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 pion-exchange mechanism to dominate over the conventional two-nucleon 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 half-life limit. These constraints are significantly stronger than those previouslymore » known or expected from the ongoing accelerator experiments. {copyright} {ital 1997} {ital The American Physical Society}« less
  • 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 » and we speculate on the connection to the three e{sup +}e{sup {minus}} events observed at Fermilab with large dielectron invariant mass. {copyright} {ital 1998} {ital The American Physical Society}« less
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