Flavor changing neutral processes and Bd0−B̄d0 mixing

Shin, Michael; Bander, Myron; Silverman, Dennis

doi:10.1016/0370-2693(89)90408-5

Flavor changing neutral processes and Bd0−B̄d0 mixing

Dec, 1988

8 pages

Published in:

Phys.Lett.B 219 (1989) 381-388,
Phys.Lett.B 219 (1989) 381-388

Published: Oct 10, 2002
and
Published: 1989

DOI:

10.1016/0370-2693(89)90408-5 (publication)

Report number:

UCI-TR-88-72

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Abstract: (Elsevier B.V.)

We propose that the observed Bd⁰−B̄d⁰ mixing reported by ARGUS and CLEO is due to the tree-level flavor changing neutral coupling of the standard model Higgs scalar, H⁰, or the Z⁰, induced by new physics with a mass scale beyond the standard model. The strengths of the flavor changing couplings of H⁰ and Z⁰ are shon to be increasing with the masses of the fermion flavors involved. If the observed Bd⁰-B̄d⁰ mixing is due to the flavor changing coupling of H⁰, the key predictions are D D⁰-D̄⁰ mixing of O (10%) of the present experimental upper limit and BR(μ⁻å e⁻γ) ≅ (1.1 ± 0.6) × 10⁻¹², and the mass of the Higgsscalar MH≅(200–300) GeV. In case the observed Bd⁰ - B̄d⁰ mixing is due to the flavor changing coupling of Z⁰, the rare decay mode μ⁻åe⁻e⁺e⁻ is predicted to be observable at any time in the near future with the branching ratio in the neighborhood of the present experimental upper limit, while other predictions include: D⁰-D̄⁰ mixing of O(1–10)% of the present upper limit, BR(Bs⁰å μ⁺μ⁻X) ≅ (8.5 ± 4.2) × 10⁻⁵, BR(τ^t-å μ⁻μ+μ⁻) ≅ (8.8 ±4.8) × and the branching ratios for the flavor changing decay modes of Z⁰, BR(Z⁰åbs̄ + ss̄) × 10⁷ ≅ (14 ±7), BR (Z⁰å tc̄ + ct̄) × 10⁷ ± (1500 ± 700)(mt/60 GeV), BR(Z⁰å b′b̄ +bb̄′) × 10⁷ ≅ (4800 ± 2300)(mb/50 GeV), BR (Z⁰å μ⁻τ⁺ + μ⁺τ⁻) × 3.6 ± 1.8, and BR (Z⁰å τ′ τ̄ + τ̄′τ) × 10⁷ ≅ (1300 ± 600) (mτ/40 GeV). These flavor changing branching ratios of Z⁰ can be tested at LEP with 10⁷ Z⁰′s. From the observed strength of Bd⁰-B̄d⁰ mixing the scale of new physics can be inferred to be M ≅ 250 GeV.

B0 anti-B0: mixing
HIGGS PARTICLE: MASS
MASS: HIGGS PARTICLE
HIGGS PARTICLE: COUPLING
COUPLING: HIGGS PARTICLE
Z0: COUPLING
COUPLING: Z0
COUPLING: FLAVOR CHANGING
FLAVOR CHANGING: COUPLING
D0 anti-D0: mixing

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