Upper limit on the branching ratio for the decay τ-→Π-ηvτ

Upper limit on the η → π + π − branching ratio with the KLOE detector . The KLOE Collaboration

We have searched with the KLOE detector for the P and CP violating decay η → ππ in a sample of 1.55 × 10 η’s from the decay φ → ηγ of φ-mesons produced in ee annihilations at DAΦNE. No signal is found. We obtain the upper limit BR(η → ππ)< 1.3×10 at 90% confidence level.

Measurement of the Dalitz-decay branching ratio of the π

The ratio B = Γ (π → eeγ)/Γ (π → γγ) is measured by comparing the production rates of the π in the two decay channels. The analysis is based on approximately four million hadronic decays of the Z boson recorded by the ALEPH detector in the years 1991 to 1995. The value of B is determined to be (1.140 ± 0.041)%. A recalculation of the Particle Data Group world average gives rise to a slightly im...

Measurement of the - - + - branching fraction and a τ → ηπ π π ντ search for a second - class current in the - ( 958 ) - decay τ → η π ντ ′

Measurement of the branching ratio for the decay K ± → π ± π 0 π 0 with the KLOE detector

A new measurement of the absolute branching ratio BR(K → πππ) with the KLOE detector at the DAΦNE ee collider is presented, based on a sample of ∼ 3.3× 10 charged kaons tagged events, produced in the reaction ee → φ → KK. The value BR(K → πππ) = (1.781± 0.013stat ± 0.016syst)% has been obtained. The study of the non leptonic three pions decays of K has been subject of a new both theoretical and...

A High Statistics Study of the Decay τ − → π − π 0 ν τ

K. Abe, K. Abe, I. Adachi, H. Aihara, K. Aoki, K. Arinstein, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, T. Aziz, S. Bahinipati, A. M. Bakich, V. Balagura, Y. Ban, S. Banerjee, E. Barberio, M. Barbero, A. Bay, I. Bedny, K. Belous, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, A. Bozek, M. Bračko, 22, 15 J. Brodzicka, T. E. Browder, M.-C. Chang, P. Chang, Y. Chao, A. Chen, K.-F. Chen, W. T. Chen, B....