Observation of a new structure near 10.75GeV in the energy dependence of the e+e− → Υ(nS)π+π− (n = 1,2,3) cross sections
- Title
- Observation of a new structure near 10.75GeV in the energy dependence of the e+e− → Υ(nS)π+π− (n = 1,2,3) cross sections
- Author
- 천병구
- Keywords
- e plus -e- Experiments; Quarkonium; Spectroscopy
- Issue Date
- 2019-10
- Publisher
- SPRINGER
- Citation
- JOURNAL OF HIGH ENERGY PHYSICS, v. 10, no. 20, article no. 220
- Abstract
- We report a new measurement of the e(+)e(-)-> Upsilon(nS)pi(+)pi(-) (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= open="(10752.7 +/- 5.9-1.1+0.7 MeV/c2 and Gamma)" open (">35.5-11.3 0.5em -3.3+17.6+3.9 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(-)-> Upsilon (1S)pi(+)pi(-) process at the energy 10.52 GeV, which is below the B (B) over bar threshold.
- URI
- https://link.springer.com/article/10.1007/JHEP10(2019)220https://repository.hanyang.ac.kr/handle/20.500.11754/154438
- ISSN
- 1029-8479
- DOI
- 10.1007/JHEP10(2019)220
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
- Files in This Item:
- 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.pdfDownload
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