Probing photon helicity in radiative B decays via charmonium resonance interference

Knecht, M.; Schietinger, T.

doi:10.1016/j.physletb.2006.02.004

Cited by 6 publications

(1 citation statement)

References 35 publications

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“…We conclude that it is difficult to test SD physics with exclusive B → Kγγ decays. However, even strongly resonance polluted, this mode could be useful to probe the photon helicity in b → sγ via interference of different resonance amplitudes, as pointed out recently in [11].…”

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confidence: 92%

Phenomenological study of the double radiative decay $B\rightarrow K \gamma \gamma$

Safir¹,

Hiller²

2007

Proceedings of International Europhysics Conference on High Energy Physics — PoS(HEP2005)

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Using the operator product expansion (OPE) technique, we study the rare double radiative decay B → Kγγ in the Standard Model (SM) and beyond. 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/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) OPE 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. On the other hand, the present experimental upper limit on B s → τ + τ − decays, leaves considerable room for New Physics (NP) 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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confidence: 92%