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# Search results

1,160 records were found.

## Measurements of the CKM angle $\beta/\phi_1$ at the B Factories

We report measurements of time-dependent CP asymmetries related to the CKM angle $\beta/\phi_1$, using decays of neutral B mesons to charmonium, open charm and in $b\to s$ loop processes. A preliminary measurement of time-dependent CP asymmetries in $B^0\to \rho^0(770) K^0_S$ decays from the BaBar experiment is given here.

## The NA48 liquid krypton calorimeter description and performances

The NA48 experiment at CERN aims at making a precision study of direct CP violation in the neutral kaons, by measuring $Re(\epsilon'/\epsilon)$ with an accuracy better than 0.02%. To achieve this goal, the experiment requires a neutral detector with fast response, high efficiency in a high-rate environment (\sim MHz), long-term stability, sub-nanosecond time resolution, millimetric space precision, and an excellent energy resolution (1%) in the $5 \to 100$ GeV range. To achieve these performances, a quasi-homogeneous Liquid Krypton calorimeter has been chosen, designed with a projective tower geometry, high transversal segmentation, and fast digital readout. The calorimeter was operative during the '97 data taking period, its performances were thoroughly studied, and found to be in agreement with design requirements. A detector descrip...

## Measurements of the CKM angle $\alpha/\phi_2$ at the B Factories

We describe measurements related to the CKM angle $\alpha/\phi_2$, using exclusive decays of B mesons to charmless hadronic final states. Time-dependent CP asymmetries, branching fractions and direct CP asymmetries in the $B \to \pi\pi, B \to \rho\pi$ and $B \to \rho\rho$ modes are considered. Constraints on the CKM angle α are obtained, and perspectives on future constraints are discussed.

## The Gravitational and Electrostatic Fields Far from an Isolated Einstein-Maxwell Source

Comment: 11 pages, revTeX

## Measurements of the CKM angle $\beta/\phi_1$ at the B Factories

Comment: Contributed to the Proceedings of the XLI Rencontres de Moriond - Electroweak Interactions and Unified Theory, La Thuile Italy, March 11-18, 2006. 6 pages

## CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories

Comment: Final version accepted for publication in EPJ C, updated results and plots are available at: http://ckmfitter.in2p3.fr or http://www.slac.stanford.edu/xorg/ckmfitter/ (mirror)

## Predictions of selected flavour observables within the Standard Model

This letter gathers a selection of Standard Model predictions issued from the metrology of the CKM parameters performed by the CKMfitter group. The selection includes purely leptonic decays of neutral and charged B, D and K mesons. In the light of the expected measurements from the LHCb experiment, a special attention is given to the radiative decay modes of B mesons as well as to the B-meson mixing observables, in particular the semileptonic charge asymmetries a^d,s_SL which have been recently investigated by the D0 experiment at Tevatron. Constraints arising from rare kaon decays are addressed, in light of both current results and expected performances of future rare kaon experiments. All results have been obtained with the CKMfitter analysis package, featuring the frequentist statistical approach and using Rfit to handle theoretic...

## Predictions of selected flavour observables within the Standard Model

This letter gathers a selection of Standard Model predictions issued from the metrology of the CKM parameters performed by the CKMfitter group. The selection includes purely leptonic decays of neutral and charged B, D and K mesons. In the light of the expected measurements from the LHCb experiment, a special attention is given to the radiative decay modes of B mesons as well as to the B-meson mixing observables, in particular the semileptonic charge asymmetries a^d,s_SL which have been recently investigated by the D0 experiment at Tevatron. Constraints arising from rare kaon decays are addressed, in light of both current results and expected performances of future rare kaon experiments. All results have been obtained with the CKMfitter analysis package, featuring the frequentist statistical approach and using Rfit to handle theoretical...

## Evidence for an excess of B -> D(*) Tau Nu decays

Based on the full BaBar data sample, we report improved measurements of the ratios R(D(*)) = B(B -> D(*) Tau Nu)/B(B -> D(*) l Nu), where l is either e or mu. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R(D) = 0.440 +- 0.058 +- 0.042 and R(D*) = 0.332 +- 0.024 +- 0.018, which exceed the Standard Model expectations by 2.0 sigma and 2.7 sigma, respectively. Taken together, our results disagree with these expectations at the 3.4 sigma level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model. We also report the observation of the decay B -> D Tau Nu, with a significance of 6.8 sigma.