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Search for the double-charmonium state with ηcJ/ψ at Belle.
- Source :
- Journal of High Energy Physics; Aug2023, Vol. 2023 Issue 8, p1-21, 21p
- Publication Year :
- 2023
-
Abstract
- We measure the cross section of e<superscript>+</superscript>e<superscript>−</superscript> → η<subscript>c</subscript>J/ψ at the Υ(nS)(n = 1–5) on-resonance and 10.52 GeV off-resonance energy points using the full data sample collected by the Belle detector with an integrated luminosity of 955 fb<superscript>−1</superscript>. We also search for double charmonium production in e<superscript>+</superscript>e<superscript>−</superscript> → η<subscript>c</subscript>J/ψ via initial state radiation near the η<subscript>c</subscript>J/ψ threshold. No evident signal of the double charmonium state is found, but evidence for the e<superscript>+</superscript>e<superscript>−</superscript>→ η<subscript>c</subscript>J/ψ process is found with a statistical significance greater than 3.3σ near the η<subscript>c</subscript>J/ψ threshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions. [ABSTRACT FROM AUTHOR]
- Subjects :
- CHARMONIUM
STATISTICAL significance
ENERGY consumption
Subjects
Details
- Language :
- English
- ISSN :
- 11266708
- Volume :
- 2023
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Journal of High Energy Physics
- Publication Type :
- Academic Journal
- Accession number :
- 171892458
- Full Text :
- https://doi.org/10.1007/JHEP08(2023)121