Precision measurement of the branching fractions of J/psi -> pi+pi-pi0 and psi' -> pi+pi-pi0

Abstract

We study the decays of the J/psi and psi' mesons to pi+pi-pi0 using data samples at both resonances collected with the BES III detector in 2009. We measure the corresponding branching fractions with unprecedented precision and provide mass spectra and Dalitz plots. The branching fraction for J/psi -> pi+pi-pi0 is determined to be (2.137 +- 0.004 (stat.) +0.058-0.056 (syst.) +0.027-0.026 (norm.))*10-2, and the branching fraction for psi' -> pi+pi-pi0 is measured as (2.14 +- 0.03 (stat.) +0.08-0.07 (syst.) +0.09-0.08 (norm.))*10-4. The J/psi decay is found to be dominated by an intermediate rho(770) state, whereas the psi' decay is dominated by di-pion masses around 2.2 GeV/c2, leading to strikingly different Dalitz distributions.

arXiv comment15 pages, 2 figures

References in corpus (17)

• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• The $e^{+}{e}^{-}\to 2({\pi }^{+}{\pi }^{-}){\pi }^0$, 2(π^+π^-)η$,$K^+ K^-π^+π^-π^0$and$K^+ K^-π^+π^-η$ Cross Sections Measured with Initial-State Radiation
• Branching fraction measurements of χ_{c0} and χ_{c2} to π^0π^0 and ηη
• Study of e+e- --> pi+ pi- pi0 process using initial state radiation with BABAR
• Measurements of h_c(^1P_1) in psi' Decays
• Intrinsic Charm of Vector Mesons: A Possible Solution of the "rho pi" Puzzle
• A possible hadronic excess in psi(2S) decay and rho-pi puzzle
• Measurement of the Branching Fraction of J/psi --> pi+ pi- pi0
• An Explanation for the rho-pi Puzzle of J/psi and psi' Decays
• Observation of 1^-0^- Final States from psi(2S) Decays and e^+e^- Annihilation
• Measurement of the Matrix Element for the Decay ${\eta }^{\prime }\to \eta {\pi }^{+}{\pi }^{-}$
• Trigger efficiencies at BES III
• Measurement of the anti-B ---> D* pi lepton anti-neutrino(lepton) Branching Fraction
• Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations
• Exclusive charmonium decays

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