Factorization for power corrections to and

Lee, Keith S. M.; Stewart, Iain W.

doi:10.1016/j.nuclphysb.2005.05.004

Cited by 95 publications

(135 citation statements)

References 89 publications

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“…For e + e − → dijets event shapes described by SCET I , the leading O(λ) power corrections vanish [19,68,70]. This is expected because fixed order calculations indicate the leading correction should scale as e, while an O(λ) power correction would scale as √ e for our power counting.…”

Section: Vanishing At O(λ)mentioning

confidence: 69%

“…A prototypical example of this is the factorization theorem for the decay rate of b → sγ at large E γ , which has the same form as eq. (1.1) at leading power, and where a factorization theorem for the O(τ 0 ) terms has been derived [19]. It involves subleading hard, jet, and soft functions, since power corrections can not change the relevant degrees of freedom.…”

Section: Jhep11(2017)142mentioning

confidence: 99%

“…The description of observables with more complicated dynamics typically relies on factorization theorems and much less is known about the structure of power corrections in these cases. Power corrections have been considered for Drell-Yan [11][12][13][14][15] at O(Λ 2 QCD /Q 2 ), for inclusive B decays in the endpoint region at O((1−z) 0 , (Λ QCD /m b ) 1,2 ) [16][17][18][19][20][21][22][23][24], for exclusive B decays at O(Λ QCD /m b ) [25][26][27][28][29][30][31][32][33], for event shapes τ in e + e − , ep, and pp collisions at O(Λ k QCD /(Qτ ) k ) [13,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48], and at O((1 − z) 0 ) for threshold resummation [49][50][51][52][53][54][55][56]…”

Section: Introductionmentioning

confidence: 99%

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A complete basis of helicity operators for subleading factorization

Feige

Kolodrubetz

Moult

et al. 2017

J. High Energ. Phys.

Self Cite

193

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Factorization theorems underly our ability to make predictions for many processes involving the strong interaction. Although typically formulated at leading power, the study of factorization at subleading power is of interest both for improving the precision of calculations, as well as for understanding the all orders structure of QCD. We use the SCET helicity operator formalism to construct a complete power suppressed basis of hard scattering operators for e + e − → dijets, e − p → e − jet, and constrained Drell-Yan, including the first two subleading orders in the amplitude level power expansion. We analyze the field content of the jet and soft function contributions to the power suppressed cross section for e + e − → dijet event shapes, and give results for the lowest order matching to the contributing operators. These results will be useful for studies of power corrections both in fixed order and resummed perturbation theory.

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Section: Vanishing At O(λ)mentioning

confidence: 69%

Section: Jhep11(2017)142mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A complete basis of helicity operators for subleading factorization

Feige

Kolodrubetz

Moult

et al. 2017

J. High Energ. Phys.

Self Cite

193

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show abstract

“…Using methods of effective field theory, we propose a novel factorization formula valid at any order in the 1/m b expansion, which is a generalization of the familiar soft-collinear factorization formula [27][28][29][31][32][33] dΓ(B → X u lν) = …”

Section: Introduction and Outlinementioning

confidence: 99%

Factorization at subleading power and irreducible uncertainties in $ \bar{B} \to {X_s}\gamma $ decay

Benzke¹,

Lee²,

Neubert³

et al. 2010

J. High Energ. Phys.

113

160

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Using methods from soft-collinear and heavy-quark effective theory, a systematic factorization analysis is performed for theB → X s γ photon spectrum in the endpoint region m b − 2E γ = O(Λ QCD ). It is proposed that, to all orders in 1/m b , the spectrum obeys a novel factorization formula, which besides terms with the structure H J ⊗ S familiar from inclusiveB → X u lν decay distributions contains "resolved photon" contributions of the form H J ⊗ S ⊗J and H J ⊗ S ⊗J ⊗J. Here S andJ are new soft and jet functions, whose form is derived. These contributions arise whenever the photon couples to light partons instead of coupling directly to the effective weak interaction. The new contributions appear first at order 1/m b and are related to operators other than Q 7γ in the effective weak Hamiltonian. They give rise to non-vanishing 1/m b corrections to the total decay rate, which cannot be described using a local operator product expansion. A systematic analysis of these effects is performed at tree level in hard and hard-collinear interactions. The resulting uncertainty on the decay rate defined with a cut E γ > 1.6 GeV is estimated to be approximately ±5%. It could be reduced by an improved measurement of the isospin asymmetry ∆ 0− to the level of ±4%. We see no possibility to reduce this uncertainty further using reliable theoretical methods.

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“…in Eq. (13) of [29]. The complex parameterf cc that describes the interference of nonperturbative charming penguin with the perturbative hard kernels is related to the soft charm shape function F cc defined in [21] …”

Section: B Decays Into Kx S+dmentioning

confidence: 99%

Semiinclusive hadronicBdecays as null tests of the standard model

Soni

Zupan

2007

Phys. Rev. D

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We propose a new set of observables that can be used as experimental null tests of the Standard Model in charged and neutral B decays. The CP asymmetries in hadronic decays of charged B mesons into inclusive final states containing at least one of the following mesons: KS,L, η ′ , cc bound states or neutral K * or D mesons, for all of which a U-spin rotation is equivalent to a CP conjugation, are CKM suppressed and furthermore vanish in the exact U-spin limit. We show how this reduces the theoretical error by using Soft Collinear Effective Theory to calculate the CP asymmetries for KS,LX s+d , K * X s+d and η ′ X s+d final states in the endpoint region. For these CP asymmetries only the flavor and not the charge of the decaying B meson needs to be tagged up to corrections of NLO in 1/m b , making the measurements more accessible experimentally.

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Factorization for power corrections to and

Cited by 95 publications

References 89 publications

A complete basis of helicity operators for subleading factorization

A complete basis of helicity operators for subleading factorization

Factorization at subleading power and irreducible uncertainties in $ \bar{B} \to {X_s}\gamma $ decay

Semiinclusive hadronicBdecays as null tests of the standard model

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