The correction to BR[B→Xsγ]

Baranowski, Konrad; Misiak, Mikołaj

doi:10.1016/s0370-2693(00)00544-x

Cited by 37 publications

(52 citation statements)

References 10 publications

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“…At NNLL QCD accuracy subdominant perturbative electroweak two-loop corrections are also relevant and have been calculated to be −3.6% (74,75,76,77). They are included in the present NNLL prediction.…”

Section: Tobias Hurth and Mikihiko Nakaomentioning

confidence: 88%

Radiative and Electroweak Penguin Decays ofBMesons

Hurth

Nakao

2010

Annu. Rev. Nucl. Part. Sci.

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The huge datasets collected at the two B factories, Belle and BaBar, have made it possible to explore the radiative penguin process b → sγ, the electroweak penguin process b → sℓ + ℓ − and the suppressed radiative process b → dγ in detail, all in exclusive channels and inclusive measurements. Theoretical tools have also advanced to meet or surpass the experimental precision, especially in inclusive calculations and the various ratios of exclusive channels. In this article, we review the theoretical and experimental progress over the past decade in the radiative and electroweak penguin decays of B mesons.

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Section: Tobias Hurth and Mikihiko Nakaomentioning

confidence: 88%

Radiative and Electroweak Penguin Decays ofBMesons

Hurth

Nakao

2010

Annu. Rev. Nucl. Part. Sci.

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“…As far as the perturbative corrections are concerned, they are reduced dramatically after the completion of Next-to-Leading-Order (NLO) and NNLO QCD calculations. A further improvement comes from electroweak corrections [66][67][68][69]. On the other hand, no satisfactory quantitative estimates of all the non-perturbative effects are available, but they are believed to be ≈ 5% [70].…”

Section: Constraints On the 4g2hdmsmentioning

confidence: 99%

Two Higgs doublets with fourth-generation fermions: Models for TeV-scale compositeness

2011

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We construct a class of two Higgs doublets models with a 4th sequential generation of fermions that may effectively accommodate the low energy characteristics and phenomenology of a dynamical electroweak symmetry breaking scenario which is triggered by the condensates of the 4th family fermions. In particular, we single out the heavy quarks by coupling the "heavier" Higgs doublet (Φ h ) which possesses a much larger VEV only to them while the "lighter" doublet (Φ ℓ ) couples only to the light fermions. We study the constraints on these models from precision electroweak data as well as from flavor data. We also discuss some distinct new features that have direct consequences on the production and decays of the 4th family quarks and leptons in high energy colliders; in particular the conventional search strategies for t ′ and b ′ may need to be significantly revised.

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“…accounts for electroweak matching corrections at the weak scale [30] and logarithmically enhanced electromagnetic effects affecting the evolution of the Wilson coefficients [17,31]. Finally, the term ε peng ≈ 0.2% includes the effects of penguin contractions of operators other than Q c,u 1 [27], which are numerically negligible but are included here for completeness.…”

Section: Qcd Factorization Theoremmentioning

confidence: 99%

Renormalization-group improved calculation of the $B\to X_s\gamma$ branching ratio

2005

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Using results on soft-collinear factorization for inclusive B-meson decay distributions, a systematic study of the partial B → X s γ decay rate with a cut E γ ≥ E 0 on photon energy is performed. For values of E 0 below about 1.9 GeV, the rate can be calculated without reference to shape functions using a multi-scale operator product expansion (MSOPE). The transition from the shape-function region to the MSOPE region is studied analytically. The resulting prediction for the B → X s γ branching ratio depends on three large scales: m b , √ m b ∆, and ∆ = m b − 2E 0 . Logarithms associated with these scales are resummed at next-to-next-to-leading logarithmic order. While power corrections in Λ QCD /∆ turn out to be small, the sensitivity to the scale ∆ ≈ 1.1 GeV (for E 0 ≈ 1.8 GeV) introduces significant perturbative uncertainties, which so far have been ignored. The new theoretical prediction for the B → X s γ branching ratio with E γ ≥ 1.8 GeV is Br(B → X s γ) = (3.38 +0.31 +0.32 −0.42 −0.30 ) × 10 −4 , where the first error is an estimate of perturbative uncertainties and the second one reflects uncertainties in input parameters. With this cut (89 +6 −7 ± 1)% of all events are contained. The implications of larger theory uncertainties for New Physics searches are briefly explored with the example of the type-II two-Higgs-doublet model, for which the lower bound on the charged-Higgs mass is reduced compared with previous estimates to approximately 200 GeV at 95% confidence level.

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The correction to BR[B→Xsγ]

Cited by 37 publications

References 10 publications

Radiative and Electroweak Penguin Decays ofBMesons

Radiative and Electroweak Penguin Decays ofBMesons

Two Higgs doublets with fourth-generation fermions: Models for TeV-scale compositeness

Renormalization-group improved calculation of the $B\to X_s\gamma$ branching ratio

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