Charge asymmetry and radiative φ decays ⋆
نویسنده
چکیده
The study of radiative φ decays into scalar mesons, with subsequent decay into ππγ, constitutes an important topic at the electron-positron collider DAPHNE. The interference of the respective amplitude with the one for ππγ production, where the photon originates from initial state radiation, will allow for unambiguous tests of models for the φ → γf0(→ ππ) amplitude. The forward-backward asymmetry of charged pions, which is a clear signal of such an interference, amounts up to 30 % and is at the same time quite sensitive to the details of the various amplitudes. The results for several characteristic cases are presented and their implementation into the Monte Carlo generator PHOKHARA is described.
منابع مشابه
Measurement of the branching ratio and search for a CP violating asymmetry in the η → π + π − e + e − ( γ ) decay at KLOE The KLOE Collaboration
We have studied the η → π+π−e+e−(γ) decay using about 1.7 fb−1 collected by the KLOE experiment at the DAΦNE φ-factory. This corresponds to about 72 millions η mesons produced in φ radiative decays. We have measured the branching ratio, inclusive of radiative effects, with 4% accuracy: BR(η → π+π−e+e−(γ)) = (26.8 ± 0.9Stat. ± 0.7Syst.) × 10−5. We have obtained the first measurement of the CP-od...
متن کامل2 00 9 Measurement of the branching ratio and search for a CP violating asymmetry in the η → π + π − e + e − ( γ ) decay at KLOE The KLOE Collaboration
We have studied the η → π+π−e+e−(γ) decay using about 1.7 fb−1 collected by the KLOE experiment at the DAΦNE φ-factory. This corresponds to about 72 millions η mesons produced in φ radiative decays. We have measured the branching ratio, inclusive of radiative effects, with 4% accuracy: BR(η → π+π−e+e−(γ)) = (26.8 ± 0.9Stat. ± 0.7Syst.) × 10−5. We have obtained the first measurement of the CP-od...
متن کاملMultiplicative Conservation of Baryon Number and Baryogenesis
In the canonical seesaw mechanism of neutrino mass, lepton number is only multiplicatively conserved, which enables the important phenomenon of leptogenesis to occur, as an attractive explanation of the present baryon asymmetry of the Universe. A parallel possibility, hitherto unrecognized, also holds for baryon number and baryogenesis. This new idea is shown to be naturally realized in the con...
متن کاملThe f0(980) and a0(980) Productions in Two-Photon Collisions and Radiative φ Meson Decays
We study how the scalar f0(980) and a0(980) states are produced in the two-photon collisions and radiative decays of the φ meson through unitarized Born amplitudes with the charged pion and kaon loops followed by S-wave meson-meson scattering amplitudes. We found in a previous paper that f0(980) is generated as the bound state resonance, but a0(980) as the cusp, and find here that the nature of...
متن کاملRadiative φ decays.
Radiative φ decays give us an excellent opportunity to study scalar and pseudoscalar mesons below 1 GeV. In this paper, results from different experiments are reviewed and compared.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004