Weak radiative B-meson decay beyond leading logarithms [Phys. Lett. B 400 (1997) 206]

Chetyrkin, K.G.; Misiak, Mikołaj; Münz, Manfred

doi:10.1016/s0370-2693(98)00225-1

Cited by 397 publications

(613 citation statements)

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“…In the meanwhile, the branching ratio for this decay has become quite precise through the subsequent measurements by the CLEO [3], ALEPH [4] and BELLE [5] collaborations, with the BABAR measurements keenly awaited. The present experimental average of the branching ratio B(B → X s γ) = (3.22 ± 0.40) × 10 −4 is in good agreement with the next-to-leading order prediction of the same in the standard model (SM), estimated as B(B → X s γ) SM = (3.35 ± 0.30) × 10 −4 [6,7] for the pole quark mass ratio m c /m b = 0.29 ± 0.02, rising to B(B → X s γ) SM = (3.73 ± 0.30) × 10 −4 [8], if one uses the input value m MS c (µ)/m pole b = 0.22 ± 0.04, where m MS c (µ) is the charm quark mass in the MS-scheme, evaluated at a scale µ in the range m c < µ < m b . The inherent uncertainty reflects in part the present accuracy of the theoretical branching ratio, which is limited to O(α s ), and in part the imprecise measurements of the photon energy spectrum in B → X s γ decays.…”

Section: Introductionsupporting

confidence: 88%

Improved model-independent analysis of semileptonic and radiative rareBdecays

et al. 2002

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We update the branching ratios for the inclusive decays B → X s + − and the exclusive decays B → (K, K * ) + − , with = e, µ, in the standard model by including the explicit O(α s ) and Λ QCD /m b corrections. This framework is used in conjunction with the current measurements of the branching ratios for B → X s γ and B → K + − decays and upper limits on the branching ratios for the decays B → (K * , X s ) + − to work out bounds on the Wilson coefficients C 7 , C 8 , C 9 and C 10 appearing in the effective Hamiltonian formalism. The resulting bounds are found to be consistent with the predictions of the standard model and some variants of supersymmetric theories. We illustrate the constraints on supersymmetric parameters that the current data on rare B decays implies in the context of minimal flavor violating model and in more general scenarios admitting additional flavor changing mechanisms. Precise measurements of the dilepton invariant mass distributions in the decays B → (X s , K * , K) + − , in particular in the lower dilepton mass region, and the forward-backward asymmetry in the decays B → (X s , K * ) + − , will greatly help in discriminating among the SM and various supersymmetric theories. *

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Section: Introductionsupporting

confidence: 88%

Improved model-independent analysis of semileptonic and radiative rareBdecays

et al. 2002

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“…The bremsstrahlung corrections and the necessary virtual corrections, in order to cancel the infrared divergence, are included in the term A [24].…”

Section: B Mass Matrix Of the Kk Modes For The Top And Bottom Quarksmentioning

confidence: 99%

Top quark Kaluza-Klein mode mixing in the Randall-Sundrum bulk standard model andB→Xsγ

Kim¹,

Kim

Song

2003

Phys. Rev. D

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We study top quark Kaluza-Klein (KK) mode mixing in the Randall-Sundrum scenario with all the SM fermions and gauge bosons in the bulk. Even though the simple assumption of universal bulk fermion mass m ψ leads to the same KK mass spectrum for all the SM fermions and thus suppresses new contributions to the flavor changing neutral current and the ρ parameter, large Yukawa coupling of the top quark generates the mixing among its KK modes and breaks the degeneracy: Unacceptably large contribution to ∆ρ occurs. In order to satisfy the ∆ρ constraint, we relax the model by assigning a different bulk fermion mass to SU(2) singlet bottom quark, and demonstrate that there exists some limited parameter space where the ∆ρ constraint is satisfied.It is also shown that the current measurement of Br(B → X s + γ) can be accommodated in this modified model, and one sigma level precision constrains the effective weak scale k EW such as k EW > ∼ 3 TeV for m ψ /k = −0.4, where k EW is the warp-suppressed AdS 5 curvature.

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“…In the 2HDM, the up-type and the down-type quarks couple either to the same Higgs doublet (this is known as the 2HDM-I), or they could couple to different doublets (2HDM-II). One of the most stringent test of the 2HDM type I and type II comes from the measurement of the b → sγ decay rate which receives substantial enhancement (over the SM prediction) in the 2HDM in a large region of the (m H ± , tan β) parameter space [13,14,15]. The measured b → sγ decay rate from CLEO [16] and ALEPH [17] leads to a model dependent indirect lower bound of the charged Higgs mass as function of tan β [18].…”

mentioning

confidence: 99%

Search for the lepton flavor violating decayA0/H0→τ±
Assamagan
¹
,
Deandrea
²
,
Delsart
³

2003
Phys. Rev. D
72
3
78
0
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In the two Higgs doublet model type III and in several other extensions of the Standard Model, there are no discrete symmetries that suppress flavor changing couplings at tree level. The experimental observation of the ν µ -ν τ flavor oscillation may suggest the nonconservation of lepton number. This would lead to the decay of the type A 0 /H 0 → τ ± µ ∓ . We determine the present low energy limit on lepton flavor violating (LFV) couplings from the muon g − 2 measurement and discuss the prospects for detecting lepton flavor violating decays at the TeVatron and at the Large Hadron Collider. The achievable bounds on the LFV coupling parameter λ τ µ are presented.

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Weak radiative B-meson decay beyond leading logarithms [Phys. Lett. B 400 (1997) 206]

Cited by 397 publications

References 0 publications

Improved model-independent analysis of semileptonic and radiative rareBdecays

Improved model-independent analysis of semileptonic and radiative rareBdecays

Top quark Kaluza-Klein mode mixing in the Randall-Sundrum bulk standard model andB→Xsγ

Search for the lepton flavor violating decayA0/H0→τ±
Assamagan
¹
,
Deandrea
²
,
Delsart
³

2003
Phys. Rev. D
72
3
78
0
View full text Add to dashboard Cite

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Weak radiative B-meson decay beyond leading logarithms [Phys. Lett. B 400 (1997) 206]

Cited by 397 publications

References 0 publications

Improved model-independent analysis of semileptonic and radiative rareBdecays

Improved model-independent analysis of semileptonic and radiative rareBdecays

Top quark Kaluza-Klein mode mixing in the Randall-Sundrum bulk standard model andB→Xsγ

Search for the lepton flavor violating decayA0/H0→τ±Assamagan1, Deandrea2, Delsart3 2003Phys. Rev. D723780View full textAdd to dashboardCite

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Search for the lepton flavor violating decayA0/H0→τ±
Assamagan
¹
,
Deandrea
²
,
Delsart
³

2003
Phys. Rev. D
72
3
78
0
View full text Add to dashboard Cite