Measurement of higher-order multipole amplitudes in $\psi(3686)\rightarrow\gamma\chi_{c1,2}$ with $\chi_{c1,2}\to\gamma J/\psi$ and search for the transition $\eta_{c}(2S)\to\gamma J/\psi$ - INSPIRE

DataBETA

Measurement of higher-order multipole amplitudes in $\psi(3686)\rightarrow\gamma\chi_{c1,2}$ with $\chi_{c1,2}\to\gamma J/\psi$ and search for the transition $\eta_{c}(2S)\to\gamma J/\psi$

BESIII

Collaboration

Jan 4, 2017

13 pages

Published in:

Phys.Rev.D 95 (2017) 7, 072004

Published: Apr 6, 2017

e-Print:

1701.01197 [hep-ex]

DOI:

10.1103/PhysRevD.95.072004

PDG:

{{\mathit \chi}_{{{c1}}}{(1P)}}

\rightarrow

{{\mathit \gamma}}{{\mathit J / \psi}{(1S)}}

Experiments:

BEPC-BES-III

View in:

ADS Abstract Service

reference search15 citations

Citations per year

Abstract: (APS)

Using 106 ×106 ψ(3686) events collected with the BESIII detector, we measure multipole amplitudes for the decay ψ(3686)→γχc1,2→γγJ/ψ beyond the dominant electric-dipole amplitudes. The normalized magnetic-quadrupole (M2) amplitude for ψ(3686)→γχc1,2→γγJ/ψ and the normalized electric-octupole amplitudes for ψ(3686)→γχc2, χc2→γJ/ψ are determined. The M2 amplitudes for ψ(3686)→γχc1 and χc1,2→γJ/ψ are found to differ significantly from zero and are consistent with theoretical predictions. We also obtain the ratios of M2 contributions of ψ(3686) and J/ψ decays to χc1,2, b21/b22=1.35±0.72 and a21/a22=0.617±0.083, which agree well with theoretical expectations. By considering the multipole contributions of χc1,2, we measure the product branching fractions for the cascade decays ψ(3686)→γχc0,1,2→γγJ/ψ and search for the process ηc(2S)→γJ/ψ through ψ(3686)→γηc(2S). The product branching fraction for ψ(3686)→γχc0→γγJ/ψ is 3σ larger than published measurements, while those of ψ(3686)→γχc1,2→γγJ/ψ are consistent. No significant signal for the decay ψ(3686)→γηc(2S)→γγJ/ψ is observed, and the upper limit of the product branching fraction at the 90% confidence level is determined.

Note:

12 pages, 5 figures

electron positron: annihilation
electron positron: colliding beams
psi(3685): electroproduction
psi(3685): radiative decay
chi mesons: radiative decay
eta/c(3590): radiative decay
photon: associated production
J/psi(3100): associated production
decay: angular distribution
chi/c1(3510)

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