منابع مشابه
Semileptonic B Decays at the B Factories
Semileptonic B decays provide direct access to the CKM matrix elements Vub and Vcb, whose ratio gives a measurement of the side of the Unitarity Triangle opposite the angle β. The underlying theory of semileptonic B decays is at an advanced stage. The weak currents factorize in leptonic and hadronic parts which do not interact between each other. Moreover, the b quark mass is considerably large...
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Today progress in tau physics proceeds mostly at the two B-factories BABAR and Belle, where unprecedented statistics of tau pair events produced in ee annihilations have been recorded. Both experiments rely on “B-factories” operating at a centre-of-mass energy at and around the Υ(4s) peak (10.58GeV). BABAR operates at the PEP-II complex at SLAC, which collides 9GeV electrons against 3.1GeV posi...
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In this article, I review the most recent results in radiative penguin decays from the B factories Belle and BABAR. Most notably, I will talk about the recent new observations in the decays B → (ρ/ω) γ, a new analysis technique in b → sγ, and first measurements of radiative penguin decays in the B s meson system. Finally, I will summarize the current status and future prospects of radiative pen...
متن کاملRadiative Penguin Decays at the B Factories
The flavor-changing neutral current transitions b → s and b → d cannot proceed at the tree level in the Standard Model (SM). Radiative decays such as B → Xsγ , B → Xdγ and B → Xsll hence proceed primarily via one-loop diagrams known as penguin and box diagrams. Because of this, these processes are rare in the SM, with branching ratios on the order of 10 to 10. However, for the same reason, thes...
متن کاملRare B Decays at Belle
Belle is an experiment designed to make measurements of time-dependent CP asymmetries in B physics. Important measurements of these phenomena have recently been reported.1 In addition, owing to the unparalleled performance of KEKB,2 and the excellent performance of the Belle detector, numerous interesting rare B decay modes can be studied. The Belle detector is described in detail elsewhere.3 I...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1997
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(97)00130-5