MIT Libraries logoDSpace@MIT

MIT
View Item 
  • DSpace@MIT Home
  • MIT Open Access Articles
  • MIT Open Access Articles
  • View Item
  • DSpace@MIT Home
  • MIT Open Access Articles
  • MIT Open Access Articles
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Measurement of the CP-violating phase β[subscript s][superscript J/ψϕ] in B[subscript s][superscript 0]→J/ψϕ decays with the CDF II detector

Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.
Thumbnail
DownloadAaltonen-2012-Measurement of the CP-violating phase.pdf (1.430Mb)
PUBLISHER_POLICY

Publisher Policy

Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.

Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Metadata
Show full item record
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/ψϕЄ[0.02,0.52]u[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.
Date issued
2012-04
URI
http://hdl.handle.net/1721.1/71671
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review D
Publisher
American Physical Society
Citation
T. Aaltonen et al. (CDF Collaboration). "Measurement of the CP-violating phase β[subscript s][superscript J/ψϕ] in B[subscript s][superscript 0]→J/ψϕ decays with the CDF II detector" Physical Review D 85, 072002 (2012). © 2012 American Physical Society
Version: Final published version
ISSN
1550-7998
1089-4918

Collections
  • MIT Open Access Articles

Browse

All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

My Account

Login

Statistics

OA StatisticsStatistics by CountryStatistics by Department
MIT Libraries
PrivacyPermissionsAccessibilityContact us
MIT
Content created by the MIT Libraries, CC BY-NC unless otherwise noted. Notify us about copyright concerns.