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Observation of the radiative decays of $��(1S)$ to $��_{c1}$
- Publication Year :
- 2019
- Publisher :
- arXiv, 2019.
-
Abstract
- We report the first observation of the radiative decay of the $��(1S)$ into a charmonium state. The statistical significance of the observed signal of $��(1S) \to ����_{c1}$ is 6.3 standard deviations including systematics. The branching fraction is calculated to be Br($��(1S) \to ����_{c1}$) = (4.7^{+2.4}_{-1.8} (stat) ^{+0.4}_{-0.5} (sys)) * 10^{-5}. We also searched for $��(1S)$ radiative decays into $��_{c0,2}$ and $��_c(1S,2S)$ 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 $��(2S)$ mass using $��(1S)$ tagging by the $��(2S) \to ��(1S) ��^+��^-$ transitions.<br />7pages, 3 figures
- Subjects :
- High Energy Physics - Experiment (hep-ex)
FOS: Physical sciences
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi...........ffddf18cbaed075fe529f4db342d666e
- Full Text :
- https://doi.org/10.48550/arxiv.1910.10915