Observation of Υ(2S)→γηb(1S) Decay
| dc.contributor.author | Bhardwaj, V. | |
| dc.date.accessioned | 2020-11-18T04:53:14Z | |
| dc.date.available | 2020-11-18T04:53:14Z | |
| dc.date.issued | 2018 | |
| dc.description | Only IISERM authors are available in the record. | |
| dc.description.abstract | We report the observation of Υ(2S)→γηb(1S) decay based on an analysis of the inclusive photon spectrum of 24.7 fb−1 of e+e− collisions at the Υ(2S) center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. We measure a branching fraction of B[Υ(2S)→γηb(1S)]=(6.1+0.6+0.9−0.7−0.6)×10−4 and derive an ηb(1S) mass of 9394.8+2.7+4.5−3.1−2.7 MeV/c2, where the uncertainties are statistical and systematic, respectively. The significance of our measurement is greater than 7 standard deviations, constituting the first observation of this decay mode. | en_US |
| dc.identifier.citation | Physical Review Letters, 121(23). | en_US |
| dc.identifier.other | https://doi.org/10.1103/PhysRevLett.121.232001 | |
| dc.identifier.uri | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.232001 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/1740 | |
| dc.language.iso | en | en_US |
| dc.publisher | American Physical Society | en_US |
| dc.subject | Physics | en_US |
| dc.subject | Asymmetric energy | en_US |
| dc.subject | Branching fractions | en_US |
| dc.subject | Decay mode | en_US |
| dc.subject | Standard deviation | en_US |
| dc.subject | Photon spectra | en_US |
| dc.title | Observation of Υ(2S)→γηb(1S) Decay | en_US |
| dc.type | Article | en_US |