Oct 1, 2018
Measurement of ηc (1S), ηc (2S), and nonresonant η′π+π- production via two-photon collisions
Physical Review D
- Volume
- 98
- Number
- 7
- First page
- 072001-1
- Last page
- 072001-17
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1103/PhysRevD.98.072001
© 2018 authors. Published by the American Physical Society. We report the measurement of γγ→ηc(1S),ηc(2S)→η′π+π- with η′ decays to γρ and ηπ+π- using 941 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The ηc(1S) mass and width are measured to be M=[2984.6±0.7 (stat)±2.2 (syst)±0.3 (model)] MeV/c2 and Γ=[30.8-2.2+2.3 (stat)±2.5 (syst)±1.4 (model)] MeV, respectively. First observation of ηc(2S)→η′π+π- with a significance of 5.5σ including systematic error is obtained, and the ηc(2S) mass is measured to be M=[3635.1±3.7 (stat)±2.9 (syst)±0.4 (model)] MeV/c2. The products of the two-photon decay width and branching fraction (B) of decays to η′π+π- are determined to be ΓγγΓγγB=[65.4±2.6 (stat)±7.8 (syst)] eV for ηc(1S) and [5.6-1.1+1.2 (stat)±1.1 (syst)] eV for ηc(2S). The cross sections for γγ→η′π+π- and η′f2(1270) are measured for the first time.
- Link information
-
- DOI
- https://doi.org/10.1103/PhysRevD.98.072001
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85056185657&origin=inward Open access
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85056185657&origin=inward
- URL
- https://link.aps.org/doi/10.1103/PhysRevD.98.072001
- ID information
-
- DOI : 10.1103/PhysRevD.98.072001
- ISSN : 2470-0010
- eISSN : 2470-0029
- SCOPUS ID : 85056185657