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http://hdl.handle.net/123456789/1740| Title: | Observation of Υ(2S)→γηb(1S) Decay |
| Authors: | Bhardwaj, V. |
| Keywords: | Physics Asymmetric energy Branching fractions Decay mode Standard deviation Photon spectra |
| Issue Date: | 2018 |
| Publisher: | American Physical Society |
| Citation: | Physical Review Letters, 121(23). |
| 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. |
| Description: | Only IISERM authors are available in the record. |
| URI: | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.232001 http://hdl.handle.net/123456789/1740 |
| Appears in Collections: | Research Articles |
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