The chromomagnetic dipole operator and the B semileptonic branching ratio

Ciuchini, M.; Gabrielli, Emidio; Giudice, Gian F.

doi:10.1016/s0370-2693(96)01168-9

Cited by 38 publications

(10 citation statements)

References 33 publications

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“…Whereas the Standard Model predicts the very small value B SM (B → X sg ) ≈ 0.2%, a much larger branching ratio is attainable in models with enhanced b → sg transitions [54]- [56]. This would increase the production of charmless final states in hadronic B decays, which could help to explain the low experimental values of the semileptonic branching ratio and charm yield.…”

Section: Impact Of New Physics and Constraints On Extensions Of The Ssupporting

confidence: 93%

“…A detailed analysis of the B → X s γ branching ratio in this scenario is presented in Ref. [56]. Another example with large positive χ is provided by models with techniscalars of charge 1 6 [54, 60, 61], whereas an example with large negative χ is provided by penguin diagrams with new neutral scalars and vector-like quarks of charge − 1 3 .…”

Section: Impact Of New Physics and Constraints On Extensions Of The Smentioning

confidence: 99%

“…This figure generalizes the corresponding leading-order results discussed in Refs. [52,53,56]. It is evident that for a given New Physics scenario, i.e.…”

Section: Impact Of New Physics and Constraints On Extensions Of The Smentioning

confidence: 99%

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QCD anatomy of $B\to X_s\gamma$ decays

1999

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We present an updated next-to-leading order analysis of the B → X s γ branching ratio and photon spectrum, including consistently the effects of Fermi motion in the heavy-quark expansion. For the Standard Model, we obtain B(B → X s γ) = (2.57 ± 0.26 +0.31 −0.36 ) × 10 −4 for the integral over the high-energy part of the photon spectrum with E lab γ > 2.2 GeV, where the first error reflects the uncertainty in the input parameters, and the second one the uncertainty in the calculation of Fermi motion. This prediction agrees with the CLEO measurement of the same quantity within one standard deviation. From a reanalysis of the CLEO data, we obtain for the total branching ratio B(B → X s γ) = (2.62 ± 0.60 exp +0.37 −0.30 th ) × 10 −4 using the measured rate above 2.2 GeV, and (2.66 ± 0.56 exp +0.43 −0.48 th ) × 10 −4 using a fit to the photon energy spectrum. Both values are consistent with the Standard Model prediction of (3.29 ± 0.33) × 10 −4 . Our analysis contains an improved discussion of renormalization scale dependence and QED corrections. We also study the sensitivity of the branching ratio and photon spectrum to hadronic parameters such as the b-quark mass, and to possible contributions from New Physics beyond the Standard Model.

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Section: Impact Of New Physics and Constraints On Extensions Of The Ssupporting

confidence: 93%

Section: Impact Of New Physics and Constraints On Extensions Of The Smentioning

confidence: 99%

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QCD anatomy of $B\to X_s\gamma$ decays

1999

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“…TeV scale without jeopardizing the electrodipole bsγ coupling [10,11]. One explicit example in the framework of the Minimal Supersymmetric Standard Model (MSSM) has been studied in ref.…”

Section: It Is Possible To Enhance the Chromo-dipole Bsg Coupling By ...mentioning

confidence: 99%

Inclusive eta´ production in B decays and the enhancement due to charged technipions

Xiao²,

Hongkai³

et al. 1999

J. Phys. G: Nucl. Part. Phys.

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The new contributions to the charmless B decay B → X s η ′ from the unitcharged technipions P ± and P ± 8 are estimated. The technipions can provide a large enhancement to the inclusive branching ratio: Br(B → X s η ′ ) ∼ 7 × 10 −4 for m p1 = 100GeV and m p8 = 250 ∼ 350GeV when the effect of QCD gluon anomaly is also taken into account. The new physics effect is essential to interpret the CLEO data.

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“…First, it is less constrained by the experimental results on the branching ratio of the inclusive transitions B → X s γ and B → X s l + l − than the chargino contributions [25]. Second, it includes the effect of the chromomagnetic operator which, as we will show, has a huge enhancement in SUSY models [26,27]. We perform this analysis at the NLO accuracy in QCD by using the results of Ali and Greub [28].…”

Section: Introductionmentioning

confidence: 99%

On supersymmetric contributions to theCPasymmetry of theB→φKSprocess

Khalil

Kou

2003

Phys. Rev. D

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We analyse the CP asymmetry of the B → φK S process in general supersymmetric models. In the framework of the mass insertion approximation, we derive model independent limits for the mixing CP asymmetry. We show that chromomagnetic type of operator may play an important role in accounting for the deviation of the mixing CP asymmetry between B → φK S and B → J/ψK S processes observed by Belle and BaBar experiments. A possible correlation between the direct and mixing CP asymmetry is also discussed. Finally, we apply our result in minimal supergravity model and supersymmetric models with non-universal soft terms.

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The chromomagnetic dipole operator and the B semileptonic branching ratio

Cited by 38 publications

References 33 publications

QCD anatomy of $B\to X_s\gamma$ decays

QCD anatomy of $B\to X_s\gamma$ decays

Inclusive eta´ production in B decays and the enhancement due to charged technipions

On supersymmetric contributions to theCPasymmetry of theB→φKSprocess

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