Publication: Measurement of <i>b</i>(ψ(3770) → γχ<sub><i>c</i>1</sub>) and search for ψ(3770) → γχ<sub><i>c</i>2</sub>
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Date
2015-05-26
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American Physical Society
Abstract
We report a measurement of the branching fraction for psi(3770) -> gamma chi(c1) and search for the transition psi(3770) -> gamma chi(c2) based on 2.92 fb(-1) of e(+)e(-) data accumulated at root s = 3.773 GeV with the BESIII detector at the BEPCII collider. We measure B(psi(3770) -> gamma chi(c1)) = (2.48 +/- 0.15 +/- 0.23) x 10(-3), which is the most precise measurement to date. The upper limit on the branching fraction of psi(3770) -> gamma chi(c2) at a 90% confidence level is B(psi(3770) -> gamma chi(c2)) < 0.64 x 10(-3). The corresponding partial widths are Gamma(psi(3770) -> gamma chi(c1)) = (67.5 +/- 4.1 +/- 6.7)keV and Gamma(psi(3770) -> gamma chi(c2)) < 17.4 keV.
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Cross-section, Open charm, Decay, Generator, States, Science & technology, Physical sciences, Astronomy & astrophysics, Physics, particles & fields, Physics
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