Higher-order multipole amplitude measurement in $ψ(2S)\toγχ_{c2}$

Details Higher-order multipole amplitude measurement in $ψ(2S)\toγχ_{c2}$ Higher-order multipole amplitude measurement in $ψ(2S)\toγχ_{c2}$

2011-10-08

arxiv.org/abs/1110.1742v2

Phys.Rev.D84:092006,2011

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, 4 figures

Scientific paper

10.1103/PhysRevD.84.092006

Using $106\times10^6$ $\psi(2S)$ events collected with the BESIII detector at the BEPCII storage ring, the higher-order multipole amplitudes in the radiative transition $\psi(2S)\to\gamma\chi_{c2}\to\gamma\pi\pi/\gamma KK$ are measured. A fit to the $\chi_{c2}$ production and decay angular distributions yields $M2=0.046\pm0.010\pm0.013$ and $E3=0.015\pm0.008\pm0.018$, where the first errors are statistical and the second systematic. Here $M2$ denotes the normalized magnetic quadrupole amplitude and $E3$ the normalized electric octupole amplitude. This measurement shows evidence for the existence of the $M2$ signal with $4.4\sigma$ statistical significance and is consistent with the charm quark having no anomalous magnetic moment.

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