The Isospin Model prediction for multi-pion tau decays
نویسنده
چکیده
The predictions of an isospin model are compared with the branching ratios of the 5 and 6 pion decays of the tau lepton. In both cases, the isospin model suggests that the tau favours decays in which there is an ω resonance. Recent measurements of such tau decays confirm this hypothesis. If the decay of the tau to 7 pions also proceeds through an intermediate ω, then the isospin model predicts that the branching ratio of the τ− → 4π3πν τ should be small when compared with other 7 pion decays. New limits on this mode appear to support this argument.
منابع مشابه
New Results from Cleo-ii on Hadronic Decays of the Tau Lepton
Results on semi-hadronic decays of the τ lepton are presented, from studies of e+e− annihilation data obtained at the Cornell Electron Storage Ring with the CLEO-II detector. Branching fractions have been measured for decays to two, three and four hadrons, namely τ→ ντhπ, τ→ ντhhh, and τ→ντhhhπ, where h represents a charged pion or kaon. CLEO-II has also observed decays with charged and/or neut...
متن کاملStrong decays of strange charmed P-wave mesons.
Goldstone boson decays of P-wave D s mesons are studied within the framework of Heavy Hadron Chiral Perturbation Theory. We first analyze the simplest single kaon decays of these strange charmed mesons. We derive a model independent prediction for the width of Ds2 and use experimental information on Ds1 to constrain the S-wave contribution to D 1 decay. Single and double pion decay modes are th...
متن کاملChiral Symmetry and Weak Decay of Hypernuclei
The weak decays of hyperons and hypernuclei are studied from the chiral symmetry viewpoint. The soft pion relations are useful in understanding the isospin properties of the weak hyperon decays. Recent development on the short-range part of the ΛN → NN weak transitions shows fairly good account of the weak decays of hypernuclei, though it fails to explain the n/p ratio. The π decays of light hy...
متن کاملHadronic Τ Decays into Two and Three Meson Modes within Resonance Chiral Theory
We study two and three meson decays of the tau lepton within the framework of the Resonance Chiral Theory, that is based on the following properties of QCD: its chiral symmetry in the massless case, its large-NC limit, and the asymptotic behaviour it demands to the relevant form factors. Most of the couplings in the Lagrangian are determined this way rendering the theory predictive. Our outcome...
متن کاملEffects of multi-pion correlations on the source distribution in ultra-relativistic heavy-ion collisions
Multi-pion correlation effect on the source distribution is studied. It is shown that multi-pion Bose-Einstein correlation make the average radius of the pion source become smaller. The isospin effect on the pion multiplicity distribution and the source distribution is also discussed. PACS number(s): 11.38 Mh, 11.30 Rd,25.75 Dw Ultrarelativistic hadronic and nuclear collisions provide a unique ...
متن کامل