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O’Donnell, Patrick; Tung, Humphrey K. K.

doi:10.1103/physrevd.43.r2067

Cited by 135 publications

(50 citation statements)

References 17 publications

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“…Our goal will be in particular to review the present status of the theoretical prediction for the B meson semileptonic branching ratio B SL . This quantity has received some attention in recent years since theoretical calculations (Altarelli and Petrarca, 1991), (Tanimoto, 1992), (Palmer and Stech, 1993), (Bigi et al, 1994b), (Falk et al, 1995) tended to yield values around 12.5 − 13.5%, above the experimental figure B SL = (10.4 ± 0.4)% (Particle Data Group, 1994). However, these earlier analyses have not been complete in regard to the inclusion of final state mass effects and NLO QCD corrections in the nonleptonic widths.…”

Section: A General Remarksmentioning

confidence: 99%

“…One can also include the non-perturbative O(1/m 2 b ) corrections to the spectator model which enhance the rate for B → X s e + e − by roughly 10% (Falk et al, 1994). A realistic phenomenological analysis should also include the long-distance contributions which are mainly due to the J/ψ and ψ ′ resonances (Lim et al, 1989), (Deshpande et al, 1989), (O'Donnell and Tung, 1991). Since in this review we are mainly interested in the next-to-leading short-distance QCD effects we will not include these complications in what follows.…”

Section: A General Remarksmentioning

confidence: 99%

“…We keep in mind that forŝ ≈ m 2 ψ /m 2 b ,ŝ ≈ m 2 ψ ′ /m 2 b etc. the spectator model cannot be the full story and additional long-distance contributions discussed in (Lim et al, 1989), (Deshpande et al, 1989), (O'Donnell and Tung, 1991) have to be taken into account in a phenomenological analysis. Similarly we do not include 1/m 2 b corrections calculated in (Falk et al, 1994) In fig.…”

Section: B the Differential Decay Ratementioning

confidence: 99%

“…In order to understand weak meson decays we have to understand the interplay of weak interactions with the strong forces. To accomplish this task it is necessary to employ the field theoretical tools of the operator product expansion (OPE) (Wilson and Zimmermann, 1972) and the renormalization group (Stueckelberg and Petermann, 1953), (Gell-Mann and Low, 1954), (Ovsyannikov, 1956), (Symanzik, 1970), (Callan Jr, 1970), ('t Hooft, 1973), (Weinberg, 1973). The basic virtues of these two techniques may be characterized as follows.…”

Section: Introduction a Preliminary Remarksmentioning

confidence: 99%

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Weak decays beyond leading logarithms

1996

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arXiv:hep-ph/9512380v1 15 Dec 1995 M P I − P h/95 − 104 T U M − T 31 − 100/95 F ERM ILAB − P U B − 95/305 − T SLAC − P U B 7009 November 1995) to appear in Reviews of Modern Physics WEAK DECAYS BEYOND LEADING LOGARITHMS AbstractWe review the present status of QCD corrections to weak decays beyond the leading logarithmic approximation including particle-antiparticle mixing and rare and CP violating decays. After presenting the basic formalism for these calculations we discuss in detail the effective hamiltonians for all decays for which the next-to-leading corrections are known. Subsequently, we present the phenomenological implications of these calculations. In particular we update the values of various parameters and we incorporate new information on m t in view of the recent top quark discovery. One of the central issues in our review are the theoretical uncertainties related to renormalization scale ambiguities which are substantially reduced by including next-to-leading order corrections. The impact of this theoretical improvement on the determination of the Cabibbo-Kobayashi-Maskawa matrix is then illustrated in various cases. *

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Section: A General Remarksmentioning

confidence: 99%

Section: A General Remarksmentioning

confidence: 99%

Section: B the Differential Decay Ratementioning

confidence: 99%

Section: Introduction a Preliminary Remarksmentioning

confidence: 99%

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Weak decays beyond leading logarithms

1996

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“…The resonance effects in the b → s transition have been investigated in connection to the long distance contribution of the b → s ℓ + ℓ − [16][17][18] as well as the b → s γ [19] process. In Eq.…”

Section: Minimal Sugra Modelmentioning

confidence: 99%

Erratum:b→sll¯in the minimal supergravity model [Phys. Rev. D
Goto¹,
Okada²,
Shimizu³
et al. 2002
Phys. Rev. D

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The b → s ℓ + ℓ − process is studied in the minimal supergravity model in detail. Taking account of the long distance contributions from the cc resonances, we calculate the branching ratio and the lepton forward-backward asymmetry in this model. We find that there is a strong correlation between the branching ratios of b → s γ and b → s ℓ + ℓ − processes and that the interference effect can change the b → s ℓ + ℓ − branching ratio in the off-resonance regions by up to ±15% depending on the relative phase between the long and short distance contributions. Using various phenomenological constraints including the branching ratio of b → s γ, we show that there are regions in the parameter space where the branching ratio of b → s ℓ + ℓ − is enhanced by about 50% compared to the SM. We also show that the branching ratio of b → s νν is reduced at most by 10% from the SM prediction. I IntroductionAlthough the Standard Model (SM) of the elementary particle physics is successful in explaining almost all experimental results, it is possible that physics beyond the SM exists just above the presently available energy scale. Since new physics may affect various processes at low energy such as the flavor changing neutral current (FCNC) processes of K mesons and B mesons, new physics searches in these processes are as important as direct particle searches at collider experiments. A prime example is the b → s γ process. Experimentally the inclusive branching ratio is determined as B(b → s γ) = (2.32 ± 0.57 ± 0.35) × 10 −4 at the CLEO experiment [1]. It is known that this process puts very strong constraints on various new physics beyond the SM, for example two Higgs doublet model and supersymmetric (SUSY) extension of the SM. Along with the b → s γ process, another important rare b decay process is the b → s ℓ ℓ decay. Although only upper bounds on branching ratios are given by experiments for various exclusive modes [2], this process is expected to be observed in the near future at B factories as well as at hadron machines.In this paper we investigate the b → s ℓ ℓ decay in the minimal supersymmetric standard model (MSSM), especially in the minimal supergravity (SUGRA) model.The MSSM is now considered to be the most promising candidate beyond the SM. In the MSSM, SUSY partners such as squarks, sleptons, higgsinos and gauginos can contribute to FCNC processes through loop diagrams. In order to evaluate their contributions quantitatively it is necessary to specify how soft SUSY breaking terms are generated. In particular, the soft SUSY breaking terms in the squark sector become new sources of flavor mixing, and the K 0 -K 0 mixing becomes too large if the squark mixing is O(1) and masses of SUSY partners are in below-TeV region [3]. In the minimal SUGRA model it is assumed that the soft SUSY breaking terms are universal at the Planck or GUT scale. Flavor mixing at the electroweak scale can be determined by solving the relevant renormalization group equations (RGEs) from the Planck to the low energy scale. It is shown t...

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Estimates of B-decays into K-resonances and dileptons

Ahmady

Fariborz

1996

Z. Phys. C - Particles and Fields

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Short and long distance contributions to the exclusive B-decays into various K-resonances and dileptons, i.e. B → K i ℓl(ℓ = e, µ, ν), are examined. The heavy quark effective theory has been used to calculate the hadronic matrix elements. Substantial branching fractions are obtained for the dileptonic B-decays into some higher excited states of K-mesons. The long distance (resonance) contributions to these exclusive rare B-decay modes dominate the short distance contributions mostly by two orders of magnitude. It is pointed out that, excluding the resonance contributions, the P-wave channels are dominant, accounting for about 50% of the inclusive B → X s ℓ + ℓ − branching fraction.

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Resonance contributions to the decayb→sl+l−

Cited by 135 publications

References 17 publications

Weak decays beyond leading logarithms

Weak decays beyond leading logarithms

Erratum:b→sll¯in the minimal supergravity model [Phys. Rev. D
Goto¹,
Okada²,
Shimizu³
et al. 2002
Phys. Rev. D

Estimates of B-decays into K-resonances and dileptons

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Resonance contributions to the decayb→sl+l−

Cited by 135 publications

References 17 publications

Weak decays beyond leading logarithms

Weak decays beyond leading logarithms

Erratum:b→sll¯in the minimal supergravity model [Phys. Rev. DGoto1, Okada2, Shimizu3 et al. 2002Phys. Rev. D

Estimates of B-decays into K-resonances and dileptons

Contact Info

Product

Resources

About

Erratum:b→sll¯in the minimal supergravity model [Phys. Rev. D
Goto¹,
Okada²,
Shimizu³
et al. 2002
Phys. Rev. D