Determination of the π+ - πo + e+ + v decay rate
نویسندگان
چکیده
منابع مشابه
Observation of the rare decay KS → π 0 e + e −
A search for the decay KS → π0e+e− has been made by the NA48/1 experiment at the CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity KS beam, 7 events were found with a background of 0.15 events. The branching fraction BR(KS → π0e+e−, mee > 0.165 GeV/c2) = (3.0 −1.2(stat) ± 0.2(syst)) × 10−9 has been measured. Using a vector matrix element and a form factor e...
متن کاملSearch for the Decay KL → π 0 e + e −
We report on a search for the decay KL → πee carried out by the KTeV/E799 experiment at Fermilab. This decay is expected to have a significant CP violating contribution and the measurement of its branching ratio could support the CKM mechanism for CP violation or could point to new physics. Two events were observed in the 1997 data with an expected background of 1.06 ± 0.41 events, and we set a...
متن کاملSome aspects of Dalitz decay π 0 → e + e − γ ¶
A calculation of π → eeγ in next-to-leading order in chiral perturbation theory of two flavour case extended by virtual photons is presented. The whole kinematic sector is covered and realistic experimental situation is discussed.
متن کاملCP- and T-Violation in the Decay KL → π + π − e + e − and Related Processes ∗
I review the theoretical basis of the prediction that the decay KL → π+π−e+e− should show a large CP and T -violation, a prediction now confirmed by the KTeV experiment. The genesis of the effect lies in a large violation of CP and T -invariance in the decay KL → π+π−γ, which is encrypted in the polarization state of the photon. The decay KL → π+π−e+e− serves as an analyser of the photon polari...
متن کامل0 Observation of the φ → π + π − π + π − Decay
Using 11.6 pb of data collected in the energy range 0.984–1.06 GeV by CMD-2 at VEPP-2M, the cross section of the reaction e+e− → π+π−π+π− has been studied. For the first time an interference pattern was observed in the energy dependence of the cross section near the φ meson. The branching ratio of the φ → π+π−π+π− decay double suppressed by the G-parity and OZI rule is measured Br(φ → ππππ) = (...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Letters
سال: 1962
ISSN: 0031-9163
DOI: 10.1016/0031-9163(62)90099-9