Abstract
We study the rare hadronic transitions Υ(2S)→Υ(1S)η and Υ(2S)→Υ(1S)π0 using a sample of 158×106Υ(2S) decays collected with the Belle detector at the KEKB asymmetric-energy e +e- collider. We measure the ratios of branching fractions (B)B(Υ(2S)→Υ(1S)η)B(Υ(2S)→Υ(1S) π+π-)=(1.99±0.14(stat)±0.11(syst)) ×10-3 and B(Υ(2S)→Υ(1S)π0)B(Υ(2S) →Υ(1S)π+π-)<2.3×10-4 at the 90% confidence level (CL). Assuming the value B(Υ(2S) →Υ(1S)π-π+)=(17.92±0.26)%, we obtain B(Υ(2S)→Υ(1S)η)=(3.57±0.25(stat)±0. 21(syst))×10-4 and B(Υ(2S)→Υ(1S)π0)<4. 1×10-5(90%CL).
Original language | English |
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Article number | 011104 |
Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
Volume | 87 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2013 Jan 29 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)