Flavour Changing Neutral Current transitions B → Xs/d γ and B → Xs/d l + l − provide an excellent laboratory for the search for physics beyond the Standard Model and for the study of the dynamics of b-quark inside B mesons. B → Xs/d γ and B → Xs/d l + l − decays are selected from the samples of events collected by the BaBar, Belle and CDF detectors by means of several strategies. Standard Model tests are performed through measurements of inclusive BR(B → Xs/d γ ), BR(B → Xs/d l +l −), CP and isospin asymmetries, and the study of the relevant angular distributions in B → Xs/d l + l − decays. A |Vt d /Vt s | measurement with reduced theoretical uncertainties is obtained from the branching fraction ratio BR(b → d γ )/BR(b → sγ ). The most precise |Vcb | determination is extracted by global fits to the moments of inclusive dis- tributions in B → Xc l ν and B → Xs γ using the kinetic mass scheme. Uncertainties on shape functions in the measurement of |Vub | using inclusive semileptonic decays B → Xu l ν are limited by comparing the partial rates for B → Xu l ν and B → Xs γ in restricted phase space regions.

B->Xs,d gamma and B->Xs,d l+l-

MARGONI, MARTINO
2011

Abstract

Flavour Changing Neutral Current transitions B → Xs/d γ and B → Xs/d l + l − provide an excellent laboratory for the search for physics beyond the Standard Model and for the study of the dynamics of b-quark inside B mesons. B → Xs/d γ and B → Xs/d l + l − decays are selected from the samples of events collected by the BaBar, Belle and CDF detectors by means of several strategies. Standard Model tests are performed through measurements of inclusive BR(B → Xs/d γ ), BR(B → Xs/d l +l −), CP and isospin asymmetries, and the study of the relevant angular distributions in B → Xs/d l + l − decays. A |Vt d /Vt s | measurement with reduced theoretical uncertainties is obtained from the branching fraction ratio BR(b → d γ )/BR(b → sγ ). The most precise |Vcb | determination is extracted by global fits to the moments of inclusive dis- tributions in B → Xc l ν and B → Xs γ using the kinetic mass scheme. Uncertainties on shape functions in the measurement of |Vub | using inclusive semileptonic decays B → Xu l ν are limited by comparing the partial rates for B → Xu l ν and B → Xs γ in restricted phase space regions.
2011
POS Proceedings of Science
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2528550
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