Search for the decays Bd0 → γγ and Bs0 → γγ

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doi:10.1016/0370-2693(95)01224-e

Cited by 13 publications

(6 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From Eqs. (9) and (12) it follows that the B → Kγγ rate vanishes for q 2 → 0. This must be so since in the limit that one of the photon energies vanishes the double photon rate does because the decay B → Kγ is forbidden.…”

Section: The B → Kγγ Matrix Element and Decay Distributionmentioning

confidence: 84%

“…For B → Kγγ decays, this amounts at lowest order to expanding κ(q 2 , m 2 c ) = κ(q 2 , 0) + O(m 2 c /q 2 ), that is, using κ c = 1/2, see Eq. (9). However, in the double photon decays we cannot have q 2 large enough and hence are too close to the charm threshold to use this expansion.…”

Section: Long-distance Effectsmentioning

confidence: 99%

“…B(B d → γγ) < 1.7 × 10 −6 (BaBar) [8] , B(B s → γγ) < 1.48 × 10 −4 (L3) [9], (1) which are about two orders of magnitude above their respective SM values, e.g. [6].…”

Section: Introductionmentioning

confidence: 99%

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Predictions forB→Kγγ decays

Hiller¹,

Safir²

2005

J. High Energy Phys.

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We present a phenomenological study of the rare double radiative decay B → Kγγ in the Standard Model (SM) and beyond. Using the operator product expansion (OPE) technique, we estimate the short-distance (SD) contribution to the decay amplitude in a region of the phase space which is around the point where all decay products have energy ∼ m b /3 in the rest frame of the B-meson. At lowest order in 1/Q, where Q is of order m b , the B → Kγγ matrix element is then expressed in terms of the usual B → K form factors known from semileptonic rare decays. The integrated SD branching ratio in the SM in the OPE region turns out to be ∆B(B → Kγγ) OP E SM ≃ 1 × 10 −9 . We work out the di-photon invariant mass distribution with and without the resonant background through B → K{η c , χ c0 } → Kγγ. In the SM, the resonance contribution is dominant in the region of phase space where the OPE is valid. The present experimental upper limit on B s → τ + τ − decays, which constrains the scalar/pseudoscalar Four-Fermi operators with τ + τ − , leaves considerable room for new physics in the one-particle-irreducible contribution to B → Kγγ decays. In this case, we find that the SD B → Kγγ branching ratio can be enhanced by one order of magnitude with respect to its SM value and the SD contribution can lie outside of the resonance peaks. *

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Section: The B → Kγγ Matrix Element and Decay Distributionmentioning

confidence: 84%

Section: Long-distance Effectsmentioning

confidence: 99%

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Predictions forB→Kγγ decays

Hiller¹,

Safir²

2005

J. High Energy Phys.

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“…Other particles from the supersymmetric spectrum can further modify the Standard Model expectation [1]. The current best limit on the branching fraction for B 0 → γγ, from the L3 experiment [3] at the CERN LEP collider, is B(B 0 → γγ) < 3.9 × 10 −5 (90% confidence level). In this Letter we present an analysis based on data taken with the BABAR detector [4], which operates at the PEP-II asymmetric-energy e + e − collider at the Stanford Linear Accelerator Center [5].…”

mentioning

confidence: 98%

Search for the DecayB0→γγ

Aubert

Boutigny²,

Gaillard³

et al. 2001

Phys. Rev. Lett.

Self Cite

101

141

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“…With the choice of (m b ,Λ s ) = (5.03 GeV, 370 MeV), the resulting branching ratio (1.4 · 10 −6 ) is substantially larger than what has been stated in the literature. The present best limit on the decay B s → γγ is [20] B(B s → γγ) < 1.48 · 10 −4 ,…”

Section: Numerical Estimatesmentioning

confidence: 94%

Leading logarithmic QCD corrections to the Bs → γγ decay rate including long-distance effects through Bs → φγ → γγ

Hiller

Iltan

1997

Physics Letters B

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We present leading logarithmic QCD corrections to the decay B s → γγ in the Standard Model. Further, the form factor F 1 (0) of B s → φγ is calculated in the framework of QCD sum rules and found to be in agreement with the result existing in the literature. Using Vector Meson Dominance model, the amplitude for B s → φγ → γγ is calculated as an estimate of the O 7 -type contributions to the long-distance effects in the B s → γγ decay. The resulting branching ratio B(B s → γγ) SD+LDO 7 is analysed in view of its strong dependence on the non-perturbative parameterΛ s , describing bound state effects, and the renormalization scale µ. * ‡ Supported by TUBITAK 1 We adopt the convention T r(γ µ γ ν γ α γ β γ5) = 4iǫ µναβ , with ǫ 0123 = +1. 2 In an earlier version of this paper the contributions of the operators O1,3...6 in the irreducible part in A + and A − were not completely taken into account. This is corrected here. As a second improvement we give the amplitudes in a formalism inspired by HQET to estimate the uncertainties coming from the bound state.

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Search for the decays Bd0 → γγ and Bs0 → γγ

Cited by 13 publications

References 11 publications

Predictions forB→Kγγ decays

Predictions forB→Kγγ decays

Search for the DecayB0→γγ

Leading logarithmic QCD corrections to the Bs → γγ decay rate including long-distance effects through Bs → φγ → γγ

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