@article{10902/2266,
year = {2012},
month = {4},
url = {http://hdl.handle.net/10902/2266},
abstract = {We present a measurement of the CP-violating parameter βsJ/ψϕ using approximately 6500 Bs0→J/ψϕ decays reconstructed with the CDF II detector in a sample of pp̅ collisions at √s=1.96  TeV corresponding to 5.2  fb-1 integrated luminosity produced by the Tevatron collider at Fermilab. We find the CP-violating phase to be within the range βsJ/ψϕ∈[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<m(K+K-)<1.028  GeV/c2. Assuming the standard model prediction for the CP-violating phase βsJ/ψϕ, we find the Bs0 decay width difference to be ΔΓs=0.075±0.035(stat)±0.006(syst)  ps-1. We also present the most precise measurements of the Bs0 mean lifetime τ(Bs0)=1.529±0.025(stat)±0.012(syst)  ps, the polarization fractions |A0(0)|2=0.524±0.013(stat)±0.015(syst) and |A∥(0)|2=0.231±0.014(stat)±0.015(syst), as well as the strong phase δ⊥=2.95±0.64(stat)±0.07(syst)  rad. In addition, we report an alternative Bayesian analysis that gives results consistent with the frequentist approach.},
publisher = {American Physical Society},
publisher = {Physical review. D, Particles, fields, gravitation, and cosmology, vol. 85, iss. 7, art. num. 072002 (2012)},
title = {Measurement of the CP-violating phase βsJ/ψϕ in Bs0→J/ψϕ decays with the CDF II detector},
author = {Aaltonen, Timo Antero and Álvarez González, Bárbara and Amidei, Dante and Anastassov, Anton and Annovi, Alberto and Antos, Jaroslav and Apollinari, Giorgio and Appel, Jeffrey A. and Casal Laraña, Bruno and Cuevas Maestro, Francisco Javier and Gómez Gramuglio, Gervasio and Palencia Cortezón, José Enrique and Rodrigo Anoro, Teresa and Ruiz Jimeno, Alberto and Scodellaro, Luca and Vila Álvarez, Iván  and Vilar Cortabitarte, Rocío and Vizán García, Jesús Manuel and Arisawa, Tetsuo and Amerio, Silvia},
}