We present a measurement of the CP-violating parameter beta(s)(J/psi phi) using approximately 6500 B-s(0) -> J/psi phi decays reconstructed with the CDF II detector in a sample of p (p) over bar collisions at root 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 beta(s)(J/psi phi) of [0.02, 0.52] OR [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 B-s(0) -> J/psi K+K- final state which is found to be negligible over the mass interval 1.009 < m(K+K-) < 1.028 GeV/c(2). Assuming the standard model prediction for the CP-violating phase beta(s)(J/psi phi), we find the B-s(0) decay width difference to be Delta Gamma(s) = (0.075 +/- 0.035(stat) +/- 0.006(syst)) ps(-1). We also present the most precise measurements of the B-s(0) mean lifetime tau(B-s(0)) = (1.529 +/- 0.025(stat) +/- 0.012(syst)) ps, the polarization fractions |A(0)(0)|(2) = 0.524 +/- 0.013(stat) +/- 0.015(syst) and |A(parallel)(0)|(2) = 0.231 +/- 0.014(stat) +/- 0.015(syst), as well as the strong phase delta(perpendicular) = 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.

T., A., B., Á.G., S., A., D., A., A., A., A., A., et al. (2012). Measurement of the CP-violating phase beta(s)(J/psi phi) in B-s(0) -> J/psi phi decays with the CDF II detector. PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85(7) [10.1103/PhysRevD.85.072002].

Measurement of the CP-violating phase beta(s)(J/psi phi) in B-s(0) -> J/psi phi decays with the CDF II detector

BARRIA, PATRIZIA;GAROSI, PAOLA;MAESTRO, PAOLO;RUFFINI, FABRIZIO;SCRIBANO, ANGELO;SQUILLACIOTI, PAOLA;
2012-01-01

Abstract

We present a measurement of the CP-violating parameter beta(s)(J/psi phi) using approximately 6500 B-s(0) -> J/psi phi decays reconstructed with the CDF II detector in a sample of p (p) over bar collisions at root 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 beta(s)(J/psi phi) of [0.02, 0.52] OR [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 B-s(0) -> J/psi K+K- final state which is found to be negligible over the mass interval 1.009 < m(K+K-) < 1.028 GeV/c(2). Assuming the standard model prediction for the CP-violating phase beta(s)(J/psi phi), we find the B-s(0) decay width difference to be Delta Gamma(s) = (0.075 +/- 0.035(stat) +/- 0.006(syst)) ps(-1). We also present the most precise measurements of the B-s(0) mean lifetime tau(B-s(0)) = (1.529 +/- 0.025(stat) +/- 0.012(syst)) ps, the polarization fractions |A(0)(0)|(2) = 0.524 +/- 0.013(stat) +/- 0.015(syst) and |A(parallel)(0)|(2) = 0.231 +/- 0.014(stat) +/- 0.015(syst), as well as the strong phase delta(perpendicular) = 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.
2012
T., A., B., Á.G., S., A., D., A., A., A., A., A., et al. (2012). Measurement of the CP-violating phase beta(s)(J/psi phi) in B-s(0) -> J/psi phi decays with the CDF II detector. PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85(7) [10.1103/PhysRevD.85.072002].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/29923
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