The rare decay η → ππγγ in chiral perturbation theory ∗
نویسنده
چکیده
We investigate the rare radiative eta decay modes η → π+π−γγ and η → π0π0γγ within the framework of chiral perturbation theory at O(p4). We present photon spectra and partial decay rates for both processes as well as a Dalitz contour plot for the charged decay. PACS numbers: 12.39.Fe 11.30.Rd 13.25.Jx Typeset using REVTEX †Present address: Department of Physics and Astronomy, University of Massachusetts, Amherst, MA 01003 ∗Supported by the Deutsche Forschungsgemeinschaft (SFB 201) 1
منابع مشابه
Chiral dynamics of rare eta decays and virtual Compton scattering off the nucleon
Two different topics relevant for DAΦNE and CEBAF, respectively, are covered. First we analyze the rare radiative eta decay mode η → ππγγ within the framework of chiral perturbation theory at O(p 4). We then discuss virtual Compton scattering off the nucleon at low energies. Predictions for the two spin-independent generalized polarizabilities are shown.
متن کاملar X iv : h ep - p h / 04 02 23 9 v 1 2 3 Fe b 20 04 The η → π 0 π 0 γγ decay in Generalized χ PT
Calculations of η → ππγγ decay in Generalized chiral perturbation theory are presented. Tree level and next-to-leading corrections are involved. Sensitivity to violation of the Standard counting is discussed.
متن کاملChiral–loop and Vector–meson Contributions to Η → Ππγγ Decays
The process η → π 0 π 0 γγ is discussed in Chiral Perturbation Theory (ChPT). Special attention is devoted to one-loop corrections, η-η ′ mixing effects and vector-meson dominance of ChPT counter-terms. The less interesting η → π + π − γγ transition is briefly discussed too. The rare decay modes η → π 0 π 0 γγ and η → π + π − γγ have been recently discussed by several authors in the context of ...
متن کاملl - ex / 0 20 20 08 v 1 1 1 Fe b 20 02 The Neutral Decay Modes of the Eta - Meson ∗
The neutral decay modes of the η meson are reviewed. The most recent results obtained with the Crystal Ball multiphoton detector at BNL are incorporated. This includes a new, precise result for the slope parameter α of the Dalitz plot in η → 3π 0 decay and a new, lower branching ratio for η → π 0 γγ which is consistent with chiral perturbation theory. Recently-obtained limits are given for nove...
متن کاملγγ decay within a chiral unitary approach
Together with the VMD dominant terms for η → π 0 γγ, we introduce the contribution of chiral loops from unitarized chiral perturbation theory, thus generating the a 0 (980) resonance and fixing the longstanding sign ambiguity on its contribution to this process. The same approach allows us to establish constraints in the decay from the γγ → π 0 η data. In particular, the ηV V couplings have to ...
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 1996