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Phase Difference Between the Electromagnetic and Strong Amplitudes for psi(2S) and J/psi Decays into Pairs of Pseudoscalar Mesons | | Z. Metreveli
; S. Dobbs
; A. Tomaradze
; T. Xiao
; Kamal K. Seth
; J. Yelton
; D. M. Asner
; G. Tatishvili
; G. Bonvicini
; | | Date: |
23 Mar 2012 | | Abstract: | Using the data for 24.5x10^6 psi(2S) produced in e^+e^- annihilations at
sqrt{s}=3686 MeV at the CESR-c e^+e^- collider and 8.6x10^6 J/psi produced in
the decay psi(2S)->pi^+pi^-J/psi, the branching fractions for psi(2S) and J/psi
decays to pairs of pseudoscalar mesons, pi^+pi^-, K^+K^-, and K_S K_L, have
been measured using the CLEO-c detector. We obtain branching fractions
Br(psi(2S)->pi^+pi^-)=(7.6+-2.5+-0.6)x10^-6,
Br(psi(2S)->K^+K^-)=(74.8+-2.3+-3.9)x10^-6, Br(psi(2S)->K_S
K_L)=(52.8+-2.5+-3.4)x10^-6, and Br(J/psi->pi^+pi^-)=(1.47+-0.13+-0.13)x10^-4,
Br(J/psi->K^+K^-)=(2.86+-0.09+-0.19)x10^-4, Br(J/psi+-K_S
K_L)=(2.62+-0.15+-0.14)x10^-4, where the first errors are statistical and the
second errors are systematic. The phase differences between the amplitudes for
electromagnetic and strong decays of psi(2S) and J/psi to 0^{-+} pseudoscalar
pairs are determined by a Monte Carlo method to be
delta(psi(2S)_{PP}=(110.5^{+16.0}_{-9.5})^o and
delta(J/psi)_{PP}=(73.5^{+5.0}_{-4.5})^o. The difference between the two is
Deltadelta = delta(psi(2S))_{PP}-delta(J/psi)_{PP}
=(37.0^{+16.5}_{-10.5})^o. | | Source: | arXiv, 1203.5361 | | Services: | Forum | Review | PDF | Favorites | |
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