Conveners
Session I: Vus
- Juliet Lee-Franzini (LNF-INFN, Frascati)
- Matthew Moulson (LNF-INFN, Frascati)
Session I: Vus and Vud
- Mario Antonelli (LNF-INFN, Frascati)
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Dr Vincenzo Cirigliano (Los Alamos)21/05/2007, 14:30Vus and Vud
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Prof. Antonio Pich (Valencia University, IFIC)21/05/2007, 15:00Vus and Vud
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Swagato Banerjee (University of Victoria)21/05/2007, 15:30Vus and VudWe report measurements of branching fractions for several hadronic tau decays to final states including kaons, which can be used to determine the strange quark mass and the element |Vus| of the CKM quark mixing matrix. The results are collected with the Babar detector at PEP-II, the SLAC asymmetric-energy e+e- collider.Go to contribution page
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Andreas Juettner (Univ. of Southampton)21/05/2007, 15:50Vus and VudWe present the latest results from UKQCD/RBC collaborations for the Kl3 form factor with 2+1 flavours of dynamical domain wall quarks. Simulations are performed on 16^3x32x16 and 24^3x64x16 lattices with three values of the light quark mass, allowing for an extrapolation to the chiral limitGo to contribution page
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Ms Anne Dabrowski (Department of Physics and Astronomy, Northwestern University)21/05/2007, 16:10Vus and VudMeasured ratios of decay rates for ${\cal R}_{K e 3 / K2\pi}$, ${\cal R}_{K \mu 3 / K2\pi}$ and ${\cal R}_{K \mu 3 / Ke3}$ are presented, based on $K^\pm$ decays collected in a dedicated run in 2003 by the NA48/2 experiment at CERN. The results obtained are $ {\cal R}_{K e 3 / K2\pi} = 0.2470\pm 0.0009 (stat)\pm 0.0004 (syst)$ and $ {\cal R}_{K \mu 3 / K2\pi} = 0.1637\pm 0.0006...Go to contribution page
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Emilie Passemar (IPN Orsay)21/05/2007, 17:00Vus and VudIn this talk we will introduce an accurate dispersive parametrization of the two K_{l3} form factors and discuss three applications to the analysis of K_{e3} and K_{mu3} measurements: the prediction of the branching ratios K_{mu3}/K_{e3}, the extraction of |f_+(0)V_{us}| and finally the possible measurement of m_d - m_u induced isospin breaking asymmetry.Go to contribution page
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Jan Stern (IPN Orsay)21/05/2007, 17:20Vus and VudThe recent dedicated analysis of K^L_{$\mu$ 3} Dalitz plot by NA48 reveals a 5 $\sigma$ deviation from the Callan-Treiman low-energy theorem , provided standard electroweak couplings of quarks are assumed. QCD can hardly tolerate such a huge violation of its $ SU(2) X SU(2) $ chiral symmetry. We suggest that , instead, the observed discrepancy reflects a small admixture of right -...Go to contribution page
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Dr Barbara Sciascia (LNF - INFN, Frascati)21/05/2007, 17:50Vus and VudThe semileptonic BR's are relevant for the evaluation of the CKM matrix element |Vus|. The measurement of the branching ratios for the charged K semileptonic decays uses four independent samples tagged by the following kaon decays: K+ -> mu2, K+ -> pi2, K- -> mu2, and K- -> pi2. Using 410 pb-1 of total integrated luminosity (2.5 fb-1), about 60 million tag decays have been identified...Go to contribution page
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Mr Viacheslav Duk (INR RAS)21/05/2007, 18:10Vus and VudWe review recent results on charged kaon decays obtained by ISTRA+ collaboration. The obtained branching fractions are compared with theoretical predictions. For Kl3 radiative decays the estimations of T-odd asymmetry are given.Go to contribution page
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Dr Claudio Gatti (LNF - INFN, Frascati)21/05/2007, 18:30Vus and VudSemileptonic kaon decays offer possibly the cleanest way to obtain an accurate value of the Cabibbo angle, or better, $V_{us}$. At present, the largest uncertainty in calculating $V_{us}$ from the decay rate, is due to the difficulties in computing the matrix element of the $K \rightarrow \pi$ transition. The matrix element of $K_L \rightarrow \pi \mu \nu$ decay is expressed in...Go to contribution page
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Paolo Massarotti (Naples University & INFN)21/05/2007, 18:50Vus and VudThe charged K lifetime, is an experimental input to the determination of Vus. The present fractional uncertainty is about 0.2%, however the available data show large discrepancies between the measurements done using charged kaon decays in-flight and at-rest. At KLOE two different methods have been developed: one based on the measurement of the charged kaon decay length and the other...Go to contribution page
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Prof. Takashi Kaneko (KEK, Tsukuba)22/05/2007, 09:00Vus and Vud
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Dr Takeyasu Ito (Los Alamos)22/05/2007, 09:30Vus and Vud
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Dr Matteo Palutan (LNF -INFN)22/05/2007, 10:00Vus and VudAt present, the first-row constraint, $|V_{ud}|^2 + |V_{us}|^2 + |V_{ub}|^2$ = 1 (with $|V_{ub}|^2$ negligible), offers the most precise test of CKM unitarity. Up until 2002 (and for the 2004 PDG evaluation), the evaluation of $|V_{us}$ from older $K_{l3}$ data gave 2.3$\sigma$ hint of unitarity violation in the first-row test. The 2003 measurement of BR($K^+_{e2}$) by BNL E865 gave a...Go to contribution page