Electromagnetic logarithms in

Huber, Tobias; Lunghi, Enrico; Misiak, Mikołaj; Wyler, D.

doi:10.1016/j.nuclphysb.2006.01.037

Cited by 240 publications

(374 citation statements)

References 42 publications

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“…In the SCET expansion they are both power and α s suppressed and thus beyond the order we are working at. Similar considerations apply to electroweak corrections [21,22], which are not included here.…”

Section: Split Matching and Effective Wilson Coefficientsmentioning

confidence: 99%

NonperturbativemXcut effects inB→Xsl+l−observables

Lee

Tackmann

2009

Phys. Rev. D

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Recently, it was shown that in inclusive B → Xs ℓ + ℓ − decay, an angular decomposition provides three independent (q 2 dependent) observables. A strategy was formulated to extract all measurable Wilson coefficients in B → Xs ℓ + ℓ − from a few simple integrals of these observables in the low q 2 region. The experimental measurements in the low q 2 region require a cut on the hadronic invariant mass, which introduces a dependence on nonperturbative b quark distribution functions. The associated hadronic uncertainties could potentially limit the sensitivity of these decays to new physics. We compute the nonperturbative corrections to all three observables at leading and subleading order in the power expansion in ΛQCD/m b . We find that the subleading power corrections give sizeable corrections, of order −5% to −10% depending on the observable and the precise value of the hadronic mass cut. They cause a shift of order −0.05 GeV 2 to −0.1 GeV 2 in the zero of the forward-backward asymmetry.

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Section: Split Matching and Effective Wilson Coefficientsmentioning

confidence: 99%

NonperturbativemXcut effects inB→Xsl+l−observables

Lee

Tackmann

2009

Phys. Rev. D

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“…The NNLL QCD calculations for the branching ratio [58][59][60][61][62][63][64] and the forwardbackward asymmetry [65][66][67][68][69][70] have been finalised some time ago by an effort of several research groups. Even electromagnetic corrections have been already calculated [69,71,72]. The theoretical accuracy in the low-q 2 region is of the order of 10% [72].…”

Section: Cross-check With the Inclusive Modementioning

confidence: 99%

On the LHCb anomaly in B → K * ℓ + ℓ −

Hurth

Mahmoudi

2014

J. High Energ. Phys.

126

131

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Abstract:The latest LHCb angular analysis of the rare decay B → K * µ + µ − shows some discrepancies from the SM up to the 3.7σ level. There is a consistent new physics explanation of these anomalies, while it is also reasonable that these anomalies are just statistical fluctuations and/or a direct consequence of underestimated hadronic uncertainties. We briefly discuss possible cross-checks of the various hypotheses with an analysis of the inclusive B → X s + − based on the data collected by the B factories Babar and Belle and also based on future opportunities at SuperBelle. We also present a global analysis of the latest LHCb data under the hypothesis of Minimal Flavour Violation. The latter is an important benchmark scenario for new physics models. Any measurements beyond the MFV bounds and relations unambiguously indicate the existence of new flavour structures next to the Yukawa couplings of the Standard Model. However, if new physics is responsible for these discrepancies, we show it is compatible with the MFV hypothesis, so no new flavour structures are needed. Moreover, we analyse the impact of the correlations between the observables based on a Monte Carlo study.

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“…[23]. This expansion starts with tree-level contributions denoted by the superscript (00), has higher-order QCD corrections (m0) with m > 0, pure QED corrections (mm) with m > 0 and mixed QCD-QED corrections (mn) with m > n > 0, all of which depend explicitly on µ 0 except for (00).…”

Section: Matching Calculation Of Nlo Electroweak Correctionsmentioning

confidence: 99%

“…Above, Eq. (12) has to be understood as the definition of the components C (mn) i that complies with the single-G F normalization in the literature [23]. Comparison with Eqs.…”

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confidence: 99%

Electroweak corrections toBs,d→ℓ+ℓ−

2014

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We calculate the full two-loop electroweak matching corrections to the operator governing the decay Bq → + − in the Standard Model. Their inclusion removes an electroweak scheme and scale uncertainty of about ±7% of the branching ratio. Using different renormalization schemes of the involved electroweak parameters, we estimate residual perturbative electroweak and QED uncertainties to be less than ±1% at the level of the branching ratio.

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Electromagnetic logarithms in

Cited by 240 publications

References 42 publications

NonperturbativemXcut effects inB→Xsl+l−observables

NonperturbativemXcut effects inB→Xsl+l−observables

On the LHCb anomaly in B → K * ℓ + ℓ −

Electroweak corrections toBs,d→ℓ+ℓ−

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