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Observation of a new structure near 10.75 GeV in the energy dependence of the e+e−→ ϒ (nS)π+π− (n = 1, 2, 3) cross sections

Belle Collaboration; Mizuk, R.; Bondar, A.; Adachi, I.; Aihara, H.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Ayad, R.; Badhrees, I.; Bahinipati, S.; Bakich, A. M.; Behera, P.; Beleño, C.; Berger, M.; Bhardwaj, V.; Bilka, T.; Biswal, J.; Bozek, A.; Bračko, M.; Browder, T. E.; ... mehr

Abstract:
We report a new measurement of the e$^{+}$e$^{-}$→ ϒ(nS)π$^{+l}$π$^{-}$ (n = 1, 2, 3) cross sections at energies from 10.52 to 11.02 GeV using data collected with the Belle detector at the KEKB asymmetric-energy e$^{+}$e$^{-}$ collider. We observe a new structure in the energy dependence of the cross sections; if described by a Breit-Wigner function its mass and width are found to be M=(10752.7±5.9$^{+0.7}$$_{-1.1}$)MeV/c$^{2}$ and Γ=(35.5$^{+17.6+3.9}$$_{−11.3−3.3}$)MeV, where the first error is statistical and the second is systematic. The global significance of the new structure including systematic uncertainty is 5.2 standard deviations. We also find evidence for the e$^{+}$e$^{-}$→ ϒ (1S) π$^{+l}$π$^{-}$ process at the energy 10.52 GeV, which is below the BB̅ threshold.

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Verlagsausgabe §
DOI: 10.5445/IR/1000118542
Veröffentlicht am 21.04.2020
Originalveröffentlichung
DOI: 10.1007/JHEP10(2019)220
Scopus
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2019
Sprache Englisch
Identifikator ISSN: 1029-8479
KITopen-ID: 1000118542
Erschienen in Journal of high energy physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2019
Heft 10
Seiten Art. Nr.: 220
Vorab online veröffentlicht am 22.10.2019
Schlagwörter e+-e- Experiments, Quarkonium, Spectroscopy
Nachgewiesen in Scopus
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