Phase difference between the electromagnetic and strong amplitudes for $\psi \left(2S\right)$ and $J/\psi$ decays into pairs of pseudoscalar mesons

Journal Article · Mon May 14 00:00:00 EDT 2012 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.85.092007· OSTI ID:1083418

Metreveli, Z.; Dobbs, S.; Tomaradze, A.; Xiao, T.; Seth, Kamal K.; Yelton, J.; Asner, D. M.; Tatishvili, G.; Bonvicini, G.

Using the data for 24.5 × 106 ψ(2S) produced in e+e- annihilations at √s = 3686 MeV at the CESR-c e+e- collider and 8.6 × 106 J/ψ produced in the decay ψ(2S) → π+π-J/ψ, thebranching fractions for ψ(2S) and J/ψ decays to pairs of pseudoscalar mesons, π+π-, K+K-, and KSKL, have been measured using the CLEO-c detector. We obtain branching fractions B(ψ(2S) →π+π-) = (7.6 ± 2.5 ± 0.6) × 10-6, B(ψ(2S) → K+K-) = (74.8 ± 2.3 ± 3.9) × 10-6, B(ψ(2S) →KSKL) = (52.8 ± 2.5 ± 3.4) × 10-6, and B(J/ψ → π+π-) = (1.47 ± 0.13 ± 0.13) × 10-4, B(J/ψ →K+K-) = (2.86 ± 0.09 ± 0.19) × 10-4, B(J/ψ → KSKL) = (2.62 ± 0.15 ± 0.14) × 10-4, wherethe first errors are statistical and the second errors are systematic. The phase differences between the amplitudes for electromagnetic and strong decays of ψ(2S) and J/ψ to 0-+ pseudoscalar pairs are determined by a Monte Carlo method to be δ(ψ(2S)PP = (110.5+16.0)° and δ(J/ψ)PP = -9.5 (73.5+5.0)°. The difference between the two is Δδ ≡ δ(ψ(2S))PP - δ(J/ψ)PP = (37.0+16.5)°.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1083418
• Report Number(s): PNNL-SA-86891; PRVDAQ; KA1202033
• Journal Information: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 85, Issue 9; ISSN 1550-7998
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
electron
positron
CESR