Search forB0decays to two charged leptons

European Organization for Nuclear Research Search for Neutral B Meson Decays to Two Charged Leptons

Tau decays into three charged leptons and two neutrinos.

We have searched for the radiative leptonic tau decays ! eee e and ! ee using 3.60 fb 1 of data collected by the CLEO-II experiment at CESR. We present a rst observation of the ! eee e process. For this channel we measure the branching fraction B( ! eee e) = (2:8 1:4 0:4) 10 . An upper limit is established for the second channel: B( ! ee ) < 3:6 10 5 at 90% CL. Both results are consistent with ...

Charged leptons with nanosecond lifetimes.

Some extensions of the standard model contain additional leptons which are vectorlike under weak isospin. A class of models is considered in which these leptons do not appreciably mix with the known leptons. In such models, the heavy charged lepton and the heavy neutrino are degenerate in mass, and the degeneracy is broken by radiative corrections. The mass splitting is calculated and found to ...

AN EFFICIENT CHARGED SYSTEM SEARCH USING CHAOS

The Charged System Search (CSS) is combined to chaos to solve mathematical global optimization problems. The CSS is a recently developed meta-heuristic optimization technique inspired by the governing laws of physics and mechanics. The present study introduces chaos into the CSS in order to increase its global search mobility for a better global optimization. Nine chaos-based CSS (CCSS) methods...

Branching fractions of tau leptons to three charged hadrons.

From electron-positron collision data collected with the CLEO detector operating at Cornell Electron Storage Ring near sqrt[s]=10.6 GeV, improved measurements of the branching fractions for tau decays into three explicitly identified hadrons and a neutrino are presented as B(tau(-)-->pi(-)pi(+)pi(-)nu(tau))=(9.13+/-0.05+/-0.46)%, B(tau(-)-->K-pi(+)pi(-)nu(tau))=(3.84+/-0.14+/-0.38) x 10(-3), B(...