A study of semi-inclusive charmless B → πX decays

Kim, C. S.; Lee, J.; Oh, Sechul; Hong, Juhee; Kim, D. Y.; Kim, H. S.

doi:10.1007/s10052-002-1020-0

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…First predictions for the semi-inclusive hadronic decays B → XM in the endpoint region were given in Refs. [5,6] using the soft-collinear effective theory (SCET) [7,8,9,10] (for earlier works on semi-inclusive decays using different theoretical approaches see [11,12,13,14,15,16,17,18]). In the present work we go beyond Ref.…”

Section: Introductionmentioning

confidence: 99%

Probing electroweak physics for allB→XMdecays in the endpoint region

et al. 2007

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Using soft-collinear effective theory we describe at leading order in 1/m b all the semi-inclusive hadronic B → XM decays near the endpoint, where an energetic light meson M recoils against an inclusive jet X. We also include the decays involving η, η ′ mesons that receive additional contributions from gluonic operators. The predicted branching ratios and CP asymmetries depend on fewer hadronic parameters than the corresponding two-body B decays. This makes semiinclusive hadronic B → XM decays a powerful probe of the potential nonperturbative nature of charming penguins as well as a useful probe of new physics effects in electroweak flavor changing transitions. A comparison with B → KX data from BaBar points to an enhanced charming penguin, albeit with large experimental errors.

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Section: Introductionmentioning

confidence: 99%

Probing electroweak physics for allB→XMdecays in the endpoint region

et al. 2007

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“…Semi-inclusive hadronic decays B → XM have received much less attention over the years in contrast to the widely studied exclusive two-body B decays [1,2,3,4,5,6,7,8,9]. As we will show in this paper, semi-inclusive hadronic B decays in the endpoint region, where M is an isolated energetic meson and X is a collinear jet of hadrons in the opposite direction, are theoretically simpler than the exclusive two-body B decays in many respects, yet still address many of the questions that had been debated in the context of the two-body B decays.…”

Section: Introductionmentioning

confidence: 99%

Semi-inclusive hadronicBdecays in the endpoint region

et al. 2006

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We consider in the soft-collinear effective theory semi-inclusive hadronic B decays, B ! XM, in which an energetic light meson M near the endpoint recoils against an inclusive jet X. We focus on a subset of decays where the spectator quark from the B meson ends up in the jet. The branching ratios and direct CP asymmetries are computed to next-to-leading order accuracy in s and to leading order in 1=m b . The contribution of charming penguins is extensively discussed, and a method to extract it in semi-inclusive decays is suggested. Subleading 1=m b corrections and SU3 breaking effects are discussed.

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Fivebranes from gauge theory

2006

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We study theories with sixteen supercharges and a discrete energy spectrum. One class of theories has symmetry group $SU(2|4)$. They arise as truncations of ${\cal N}=4$ super Yang Mills. They include the plane wave matrix model, 2+1 super Yang Mills on $R \times S^2$ and ${\cal N}=4$ super Yang Mills on $R \times S^3/Z_k$. We explain how to obtain their gravity duals in a unified way. We explore the regions of the geometry that are relevant for the study of some 1/2 BPS and near BPS states. This leads to a class of two dimensional (4,4) supersymmetric sigma models with non-zero $H$ flux, including a massive deformed WZW model. We show how to match some features of the string spectrum with the Yang Mills theory. The other class of theories are also connected to ${\cal N}=4$ super Yang Mills and arise by making some of the transverse scalars compact. Their vacua are characterized by a 2d Yang Mills theory or 3d Chern Simons theory. These theories realize peculiar superpoincare symmetry algebras in 2+1 or 1+1 dimensions with "non-central" charges. We finally discuss gravity duals of ${\cal N}=4$ super Yang Mills on $AdS_3 \times S^1$.Comment: 50+24 pages, 9 figures, latex. v2: typos corrected, references adde

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A study of semi-inclusive charmless B → πX decays

Abstract: We study semi-inclusive charmless decays B → πX in detail, such as B 0 →

Cited by 3 publications

References 13 publications

Probing electroweak physics for allB→XMdecays in the endpoint region

Probing electroweak physics for allB→XMdecays in the endpoint region

Semi-inclusive hadronicBdecays in the endpoint region

Fivebranes from gauge theory

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