Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays. / The BESIII Collaboration.
в: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Том 791, 10.04.2019, стр. 375-384.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays
AU - BESIII Collaboration
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Ahmed, S.
AU - Albrecht, M.
AU - Amoroso, A.
AU - An, F. F.
AU - An, Q.
AU - Bai, Y.
AU - Bakina, O.
AU - Baldini Ferroli, R.
AU - Ban, Y.
AU - Bennett, D. W.
AU - Bennett, J. V.
AU - Berger, N.
AU - Bertani, M.
AU - Bettoni, D.
AU - Bian, J. M.
AU - Bianchi, F.
AU - Boger, E.
AU - Boyko, I.
AU - Briere, R. A.
AU - Cai, H.
AU - Cai, X.
AU - Cakir, O.
AU - Calcaterra, A.
AU - Cao, G. F.
AU - Cetin, S. A.
AU - Chai, J.
AU - Chang, J. F.
AU - Chelkov, G.
AU - Chen, G.
AU - Chen, H. S.
AU - Chen, J. C.
AU - Chen, M. L.
AU - Chen, P. L.
AU - Chen, S. J.
AU - Chen, X. R.
AU - Chen, Y. B.
AU - Chu, X. K.
AU - Cibinetto, G.
AU - Dai, H. L.
AU - Dai, J. P.
AU - Dbeyssi, A.
AU - Dedovich, D.
AU - Deng, Z. Y.
AU - Denig, A.
AU - Denysenko, I.
AU - Destefanis, M.
AU - Muchnoi, N. Yu
AU - Nikolaev, I. B.
N1 - Publisher Copyright: © 2019 The Author Copyright: Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/4/10
Y1 - 2019/4/10
N2 - Using 16 energy points of e + e − annihilation data collected in the vicinity of the J/ψ resonance with the BESIII detector and with a total integrated luminosity of around 100pb −1 , we study the relative phase between the strong and electromagnetic amplitudes of J/ψ decays. The relative phase between J/ψ electromagnetic decay and the continuum process (e + e − annihilation without the J/ψ resonance) is confirmed to be zero by studying the cross section lineshape of μ + μ − production. The relative phase between J/ψ strong and electromagnetic decays is then measured to be (84.9±3.6) ∘ or (−84.7±3.1) ∘ for the 2(π + π − )π 0 final state by investigating the interference pattern between the J/ψ decay and the continuum process. This is the first measurement of the relative phase between J/ψ strong and electromagnetic decays into a multihadron final state using the lineshape of the production cross section. We also study the production lineshape of the multihadron final state ηπ + π − with η→π + π − π 0 , which provides additional information about the phase between the J/ψ electromagnetic decay amplitude and the continuum process. Additionally, the branching fraction of J/ψ→2(π + π − )π 0 is measured to be (4.73±0.44)% or (4.85±0.45)%, and the branching fraction of J/ψ→ηπ + π − is measured to be (3.78±0.68)×10 −4 . Both of them are consistent with the world average values. The quoted uncertainties include both statistical and systematic uncertainties, which are mainly caused by the low statistics.
AB - Using 16 energy points of e + e − annihilation data collected in the vicinity of the J/ψ resonance with the BESIII detector and with a total integrated luminosity of around 100pb −1 , we study the relative phase between the strong and electromagnetic amplitudes of J/ψ decays. The relative phase between J/ψ electromagnetic decay and the continuum process (e + e − annihilation without the J/ψ resonance) is confirmed to be zero by studying the cross section lineshape of μ + μ − production. The relative phase between J/ψ strong and electromagnetic decays is then measured to be (84.9±3.6) ∘ or (−84.7±3.1) ∘ for the 2(π + π − )π 0 final state by investigating the interference pattern between the J/ψ decay and the continuum process. This is the first measurement of the relative phase between J/ψ strong and electromagnetic decays into a multihadron final state using the lineshape of the production cross section. We also study the production lineshape of the multihadron final state ηπ + π − with η→π + π − π 0 , which provides additional information about the phase between the J/ψ electromagnetic decay amplitude and the continuum process. Additionally, the branching fraction of J/ψ→2(π + π − )π 0 is measured to be (4.73±0.44)% or (4.85±0.45)%, and the branching fraction of J/ψ→ηπ + π − is measured to be (3.78±0.68)×10 −4 . Both of them are consistent with the world average values. The quoted uncertainties include both statistical and systematic uncertainties, which are mainly caused by the low statistics.
KW - BESIII
KW - Electromagnetic amplitude
KW - J/ψ decay
KW - Phase
KW - Strong amplitude
KW - J/Psi decay
KW - EXPLANATION
KW - ANNIHILATION
KW - PSI
KW - VECTOR
UR - http://www.scopus.com/inward/record.url?scp=85062993535&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2019.03.001
DO - 10.1016/j.physletb.2019.03.001
M3 - Article
AN - SCOPUS:85062993535
VL - 791
SP - 375
EP - 384
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -
ID: 23385556