Measurement of the CP-Violation Parameter sin2Φ1 with a New Tagging Method at the Υ(5S) Resonance
We report a measurement of the CP-violation parameter sin2Φ1 at the Υ(5S) resonance using a new tagging method, called “B-π tagging.” In Υ(5S) decays containing a neutral B meson, a charged B, and a charged pion, the neutral B is reconstructed in the J/ψK$$0\atop{S}$$ CP-eigenstate decay channel. The initial flavor of the neutral B meson at the moment of the Υ(5S) decay is opposite to that of the charged B and may thus be inferred from the charge of the pion without reconstructing the charged B. From the asymmetry between B-π+ and B-π- tagged J/ψK$$0\atop{S}$$ yields, we determine sin2Φ1=0.57±0.58(stat)±0.06(syst). The results are based on 121 fb-1 of data recorded by the Belle detector at the KEKB e+e- collider.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- Contributing Organization:
- Belle Collaboration
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1337741
- Report Number(s):
- PNNL-SA-87998; PRLTAO; KA2201020
- Journal Information:
- Physical Review Letters, Vol. 108, Issue 17; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
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