Forward-backward and isospin asymmetry forB→K*ell+ell−decay in the standard model and in supersymmetry | Zendy

Thorsten Feldmann | Zendy; Joaquim Matias | Zendy

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Forward-backward and isospin asymmetry forB→K*ell⁺ell⁻decay in the standard model and in supersymmetry

Author(s) -

Thorsten Feldmann,

Joaquim Matias

Publication year - 2003

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2003/01/074

Subject(s) - physics , particle physics , isospin , asymmetry , lepton , meson , b meson , invariant mass , standard model (mathematical formulation) , nuclear physics , supersymmetry , recoil , quark , physics beyond the standard model , quantum chromodynamics , electron , archaeology , gauge (firearms) , history

We discuss two dedicated observables in exclusive B -> K* l+ l- decay thatcan be used to study effects of physics beyond the standard model, namely theforward-backward asymmetry in the lepton spectrum and the isospin-asymmetrybetween decays of charged and neutral B mesons. We consider the region of largerecoil-energy (i.e. small invariant mass of the lepton pair), and employ theQCD factorization approach to exclusive B meson decays. Sub-leading effects inthe heavy quark mass expansion have been taken into account for the calculationof the isospin-asymmetry. We give predictions for decay asymmetries in thestandard model, and its supersymmetric extension with minimal flavor violation,using parameter values allowed by current experimental constraints on B->X_sgamma decay.Comment: 21 pages, LaTeX with 6 figures, added reference

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