Renormalization group evolution of R-parity-violating Yukawa couplings

Details Renormalization group evolution of R-parity-violating Yukawa couplings Renormalization group evolution of R-parity-violating Yukawa couplings

1995-11-30

arxiv.org/abs/hep-ph/9511473v1

Phys.Rev.D53:6407-6415,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

plain Latex, 19 pages, 3 postscript figures also submitted. Uses epsf.sty. Compressed postscript file of text with figures als

Scientific paper

10.1103/PhysRevD.53.6407

We study the evolution of $R$-parity-violating (RPV) couplings in the minimum supersymmetric standard model, between the electroweak and grand unification scales, assuming a family hierarchy for these coupling strengths. Particular attention is given to solutions where both the $R$-conserving and $R$-violating top quark Yukawa couplings simultaneously approach infrared fixed points; these we analyse both algebraically and with numerical solutions of the evolution equations at one-loop level. We identify constraints on these couplings at the GUT scale, arising from lower limits on the top quark mass. We show that fixed points offer a new source of bounds on RPV couplings at the electroweak scale. We derive evolution equations for the CKM matrix, and show that RPV couplings affect the scaling of the unitarity triangle. The fixed-point behaviour is compatible with all present experimental constraints. However, fixed-point values of RPV top-quark couplings would require the corresponding sleptons or squarks to have mass $\agt m_t$ to suppress strong new top decays to sparticles.

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