{ital B}{sup 0}-{bar {ital B}}{sup 0} mixing and the {epsilon}{sub {ital K}} parameter in the minimal supergravity model
- Department of Physics, Tohoku University, Sendai 980-77 (Japan)
- Institute for Cosmic Ray Research, University of Tokyo, 3-2-1 Midori-cho, Tanashi-shi, Tokyo 188 (Japan)
- Theory Group, KEK, Tsukuba, Ibaraki 305 (Japan)
{ital B}{sup 0}-{bar {ital B}}{sup 0} mixing and a {ital CP} violation parameter in {ital K}{sup 0}-{bar {ital K}}{sup 0} mixing, {epsilon}{sub {ital K}}, are studied in the minimal supergravity model. We solve the one-loop renormalization group equations for the minimal supersymmetric standard model parameters numerically in order to determine the masses and mixings of the supersymmetric particles, while all off-diagonal (generation mixing) elements and phases of Yukawa coupling matrices and those of squark mass matrices are taken into account. Applying the radiative electroweak symmetry-breaking condition and phenomenological constraints including the recent measurement of the {ital b}{r_arrow}{ital s}{gamma} inclusive branching ratio, we obtain the allowed parameter region. We have found that the present constraints still allow a parameter region where both {ital B}{sup 0}-{bar {ital B}}{sup 0} mass splitting {Delta}{ital M}{sub {ital B}} and {epsilon}{sub {ital K}} are {approximately}20{percent} larger than the standard model values. By explicit numerical calculations, we have also found that the complex phase of the {ital B}{sup 0}-{bar {ital B}}{sup 0} mixing matrix element in this model is almost the same as the standard model value within good accuracy in the whole allowed parameter region. It is shown that {Delta}{ital M}{sub {ital B}} and {epsilon}{sub {ital K}} can put useful constraints on the supersymmetry{close_quote}s parameter space when the Cabibbo-Kobayashi-Maskawa matrix elements are determined through the measurements of {ital CP} violations in {ital B} decay with future {ital B} factories. {copyright}{ital 1996 The American Physical Society.}
- OSTI ID:
- 284081
- Journal Information:
- Physical Review, D, Vol. 53, Issue 9; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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