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 sqrt(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)x10-3, 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)<0.64x10-3. 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.
Measurement of B (psi(3770) --> gamma chi_c1) and search for psi(3770)-->gamma chi_c2
Garzia, I.;
2015
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 sqrt(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)x10-3, 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)<0.64x10-3. 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.File in questo prodotto:
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