Study of Υ(10753) decays to π+π−Υ(nS) final states at Belle II

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10494177" target="_blank" >RIV/00216208:11320/24:10494177 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-H5S9C72tN" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-H5S9C72tN</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP07(2024)116" target="_blank" >10.1007/JHEP07(2024)116</a>

Result language
angličtina
Original language name
Study of Υ(10753) decays to π+π−Υ(nS) final states at Belle II
Original language description
We present an analysis of the process e+e- RIGHTWARDS ARROW π+π-Υ(nS) (where n = 1, 2,or 3) reconstructed in 19.6 fb-1 of Belle II data during a special run of the SuperKEKBcollider at four energy points near the peak of the Υ(10753) resonance. By analyzing the massdistribution of the π+π-Υ(nS) system and the Born cross sections of the e+e- RIGHTWARDS ARROW π+π-Υ(nS)process, we report the first observation of Υ(10753) decays to the π+π-Υ(1S) and π+π-Υ(2S)final states, and find no evidence for decays to π+π-Υ(3S). Possible intermediate states inthe π+π-Υ(1S, 2S) transitions are also investigated, and no evidence for decays proceedingvia the πMINUS-OR-PLUS SIGNZ+-b or f0(980)Υ(nS) intermediate states is found. We measure Born cross sectionsfor the e+e- RIGHTWARDS ARROW π+π-Υ(nS) process that, combined with results from Belle, obtain themass and width of Υ(10753) to be (10756.6 +- 2.7 +- 0.9)MeV/c2 and (29.0 +- 8.8 +- 1.2)MeV,respectively. The relative ratios of the Born cross sections at the Υ(10753) resonance peakare also reported for the first time.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/GA22-18469S" target="_blank" >GA22-18469S: Studies of the Beyond Standard Model phenomena in the flavor sector with the Belle II Experiment</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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