Observation of e+e− →ωχbJ(1P) and Search for Xb→ωΥ(1S) at √s near 10.75 GeV
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Date
2023
Authors
Adachi, I.
Aggarwal, L.
Ahmed, H.
Aihara, H.
Akopov, N.
Aloisio, A.
Anh Ky, N.
Asner, D.M.
Aushev, T.
Aushev, V.
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Journal article
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Physical Review Letters, 2023; 130(9):1-8
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Belle II Collaboration ... I. Adachi ... S. A. De La Motte ... P. Jackson ... et al.
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Abstract
We study the processes e^{+}e^{-}→ωχ_{bJ}(1P) (J=0, 1, or 2) using samples at center-of-mass energies sqrt[s]=10.701, 10.745, and 10.805 GeV, corresponding to 1.6, 9.8, and 4.7 fb^{-1} of integrated luminosity, respectively. These data were collected with the Belle II detector during special operations of the SuperKEKB collider above the ϒ(4S) resonance. We report the first observation of ωχ_{bJ}(1P) signals at sqrt[s]=10.745 GeV. By combining Belle II data with Belle results at sqrt[s]=10.867 GeV, we find energy dependencies of the Born cross sections for e^{+}e^{-}→ωχ_{b1,b2}(1P) to be consistent with the shape of the ϒ(10753) state. These data indicate that the internal structures of the ϒ(10753) and ϒ(10860) states may differ. Including data at sqrt[s]=10.653 GeV, we also search for the bottomonium equivalent of the X(3872) state decaying into ωϒ(1S). No significant signal is observed for masses between 10.45 and 10.65 GeV/c^{2}.
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3 .
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http://purl.org/au-research/grants/arc/DE220100462
http://purl.org/au-research/grants/arc/DP180102629
http://purl.org/au-research/grants/arc/DP170102389
http://purl.org/au-research/grants/arc/DP170102204
http://purl.org/au-research/grants/arc/DP150103061
http://purl.org/au-research/grants/arc/FT130100303
http://purl.org/au-research/grants/arc/FT130100018
http://purl.org/au-research/grants/arc/FT120100745
http://purl.org/au-research/grants/arc/DP180102629
http://purl.org/au-research/grants/arc/DP170102389
http://purl.org/au-research/grants/arc/DP170102204
http://purl.org/au-research/grants/arc/DP150103061
http://purl.org/au-research/grants/arc/FT130100303
http://purl.org/au-research/grants/arc/FT130100018
http://purl.org/au-research/grants/arc/FT120100745