Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays

Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays. / BESIII Collaboration.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 791, 10.04.2019, p. 375-384.

Research output: Contribution to journal › Article › peer-review

BESIII Collaboration 2019, 'Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 791, pp. 375-384. https://doi.org/10.1016/j.physletb.2019.03.001

BESIII Collaboration (2019). Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 791, 375-384. https://doi.org/10.1016/j.physletb.2019.03.001

BESIII Collaboration. Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2019 Apr 10;791:375-384. doi: 10.1016/j.physletb.2019.03.001

BESIII Collaboration. / Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2019 ; Vol. 791. pp. 375-384.

@article{0e46479e9dfa4cd8a97e00a786069aab,

title = "Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays",

abstract = " 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. ",

keywords = "BESIII, Electromagnetic amplitude, J/ψ decay, Phase, Strong amplitude, J/Psi decay, EXPLANATION, ANNIHILATION, PSI, VECTOR",

author = "{BESIII Collaboration} and M. Ablikim and Achasov, {M. N.} and S. Ahmed and M. Albrecht and A. Amoroso and An, {F. F.} and Q. An and Y. Bai and O. Bakina and {Baldini Ferroli}, R. and Y. Ban and Bennett, {D. W.} and Bennett, {J. V.} and N. Berger and M. Bertani and D. Bettoni and Bian, {J. M.} and F. Bianchi and E. Boger and I. Boyko and Briere, {R. A.} and H. Cai and X. Cai and O. Cakir and A. Calcaterra and Cao, {G. F.} and Cetin, {S. A.} and J. Chai and Chang, {J. F.} and G. Chelkov and G. Chen and Chen, {H. S.} and Chen, {J. C.} and Chen, {M. L.} and Chen, {P. L.} and Chen, {S. J.} and Chen, {X. R.} and Chen, {Y. B.} and Chu, {X. K.} and G. Cibinetto and Dai, {H. L.} and Dai, {J. P.} and A. Dbeyssi and D. Dedovich and Deng, {Z. Y.} and A. Denig and I. Denysenko and M. Destefanis and Muchnoi, {N. Yu} and Nikolaev, {I. B.}",

year = "2019",

month = apr,

day = "10",

doi = "10.1016/j.physletb.2019.03.001",

language = "English",

volume = "791",

pages = "375--384",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

}

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.

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 -

Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays

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