First observation of the M1 transition $\psi(3686)\to \gamma\eta_c(2S)$ - INSPIRE

DataBETA

First observation of the M1 transition $\psi(3686)\to \gamma\eta_c(2S)$

BES

Collaboration

May, 2012

7 pages

Published in:

Phys.Rev.Lett. 109 (2012) 042003

e-Print:

1205.5103 [hep-ex]

DOI:

10.1103/PhysRevLett.109.042003

PDG:

{{\mathit \eta}_{{{c}}}{(2S)}}

\rightarrow

{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}

Experiments:

BEPC-BES

View in:

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Abstract: (arXiv)

Using a sample of 106 million \psi(3686) events collected with the BESIII detector at the BEPCII storage ring, we have made the first measurement of the M1 transition between the radially excited charmonium S-wave spin-triplet and the radially excited S-wave spin-singlet states: \psi(3686)\to\gamma\eta_c(2S). Analyses of the processes \psi(2S)\to \gamma\eta_c(2S) with \eta_c(2S)\to \K_S^0 K\pi and K^+K^-\pi^0 gave an \eta_c(2S) signal with a statistical significance of greater than 10 standard deviations under a wide range of assumptions about the signal and background properties. The data are used to obtain measurements of the \eta_c(2S) mass (M(\eta_c(2S))=3637.6\pm 2.9_\mathrm{stat}\pm 1.6_\mathrm{sys} MeV/c^2), width (\Gamma(\eta_c(2S))=16.9\pm 6.4_\mathrm{stat}\pm 4.8_\mathrm{sys} MeV), and the product branching fraction (\BR(\psi(3686)\to \gamma\eta_c(2S))\times \BR(\eta_c(2S)\to K\bar K\pi) = (1.30\pm 0.20_\mathrm{stat}\pm 0.30_\mathrm{sys})\times 10^{-5}). Combining our result with a BaBar measurement of \BR(\eta_c(2S)\to K\bar K \pi), we find the branching fraction of the M1 transition to be \BR(\psi(3686)\to\gamma\eta_c(2S)) = (6.8\pm 1.1_\mathrm{stat}\pm 4.5_\mathrm{sys})\times 10^{-4}.

Note:

7 pages, 1 figure, 1 table

13.20.Gd
13.25.Gv
14.40.Pq
psi(3685): radiative decay
branching ratio: measured
BES
electron positron: annihilation
charmonium: hadron spectroscopy
eta/c(3590): mass: measured
eta/c(3590): width: measured

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