Observation of the Radiative Decays of Ï(1S) to χ_{c1}.
Phys Rev Lett
; 124(12): 122001, 2020 Mar 27.
Article
em En
| MEDLINE
| ID: mdl-32281835
ABSTRACT
We report the first observation of the radiative decay of the Ï(1S) into a charmonium state. The significance of the observed signal of Ï(1S)âγχ_{c1} is 6.3 standard deviations including systematics. The branching fraction is calculated to be B[Ï(1S)âγχ_{c1}]=[4.7_{-1.8}^{+2.4}(stat)_{-0.5}^{+0.4}(sys)×10^{-5}]. We also searched for Ï(1S) radiative decays into χ_{c0,2} and η_{c}(1S,2S), and set upper limits on their branching fractions. These results are obtained from a 24.9 fb^{-1} data sample collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider at a center-of-mass energy equal to the Ï(2S) mass using Ï(1S) tagging by the Ï(2S)âÏ(1S)π^{+}π^{-} transitions.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2020
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Article