ar X iv : h ep - e x / 05 11 01 6 v 1 4 N ov 2 00 5 SLAC - PUB - 11557 Measurements of the CKM Angle β
نویسنده
چکیده
In this article I report on new and updated measurements of the CP-violating parameter β (φ1), which is related to the phase of the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix of the electroweak interaction. Over the past few years, β has become the most precisely known parameter of the CKM unitarity triangle that governs the B system. The results presented here were produced by the two B Factories, BABAR and Belle, based on their most recent datasets of over 600 million BB events combined. The new world average for sin2β , measured in the theoretically and experimentally cleanest charmonium modes, such as B0 → J/ψK0 S , is sin2β = 0.685± 0.032. In addition to these tree-level dominated decays, independent measurements of sin2β are obtained from gluonic b → s penguin decays, including B0 → φ K0 S , B 0 → η ′K0 S and others. There are hints, albeit somewhat weaker than earlier this year, that these measurements tend to come out low compared to the charmonium average, giving rise to the tantalizing possibility that New Physics amplitudes could be contributing to the corresponding loop diagrams. Clearly, more data from both experiments are needed to elucidate these intriguing differences.
منابع مشابه
ar X iv : h ep - p h / 01 11 23 5 v 1 1 9 N ov 2 00 1 SLAC - PUB - 9009 November 2001 Testing Factorization
We briefly review the status of factorization in b-decays. We discuss several experimental tests of its nature and stress their importance. We show that decays into mesons which have small decay constants or spin greater than one (‘designer mesons’) offer a variety of new opportunities.
متن کاملar X iv : h ep - p h / 05 11 03 7 v 1 4 N ov 2 00 5 Rephasing Invariance and Hierarchy of the CKM Matrix
We identified a set of four rephasing invariant parameters of the CKM matrix. They are found to exhibit hierarchies in powers of λ 2 , from λ 2 to λ 8. It is shown that, at the present level of accuracy, only the first three parameters are needed to fit all available data on flavor physics.
متن کاملar X iv : h ep - p h / 00 11 16 3 v 3 2 8 N ov 2 00 0 SLAC - PUB - 8707 hep - ph / 0011163 November 2000 Challenges in
We give an personal overview of some of the unsolved problems related to hyperon decays. We cover nonleptonic decays, radiative decays and magnetic moments. Some of the theoretical issues are also touched upon.
متن کاملar X iv : h ep - t h / 05 11 16 1 v 1 1 6 N ov 2 00 5 The Effective Potential in the Massive φ 4 4 Model
متن کامل
ar X iv : h ep - p h / 96 11 42 1 v 1 2 6 N ov 1 99 6 SLAC – PUB – 7361 November 1996 QCD : Questions , Challenges , and Dilemmas ∗
An introduction to some outstanding issues in QCD is presented, with emphasis on work by Diakonov and co-workers on the influence of the instanton vacuum on low-energy QCD observables. This includes the calculation of input valence-parton distributions for deep-inelastic scattering.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2005