Measurement of the CP-violating phase βsJ/ψ in Bs0→J/ψ decays with the CDF II detector

Journal article

We present a measurement of the CP-violating parameter βsJ/ψ using approximately 6500 Bs0→J/ψ decays reconstructed with the CDF II detector in a sample of pp̄ collisions at √s=1.96TeV corresponding to 5.2fb -1 integrated luminosity produced by the Tevatron collider at Fermilab. We find the CP-violating phase to be within the range βsJ/ψ [0.02,0.52] [1.08,1.55] at 68% confidence level where the coverage property of the quoted interval is guaranteed using a frequentist statistical analysis. This result is in agreement with the standard model expectation at the level of about one Gaussian standard deviation. We consider the inclusion of a potential S-wave contribution to the Bs0→J/ψK +K - final state which is found to be negligible over the mass interval 1.009

Authors: Aaltonen, T; Alvarez González, B; Amerio, S; Amidei, D; Anastassov, A

• Journal: Physical Review D
• Volume: 85
• Issue: 7
• Publication date: 2012-04-24
• DOI: 10.1103/PhysRevD.85.072002
• EISSN: 1550-2368
• ISSN: 1550-7998
• Language: English