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Improved measurement of CP-violation parameters sin 2phi(1) and |lambda|, B meson lifetimes, and B0 - anti-B0 mixing parameter Delta m(d)

Collaboration
Aug, 2004
20 pages
Published in:
  • Phys.Rev.D 71 (2005) 072003,
  • Phys.Rev.D 71 (2005) 079903 (erratum)
Contribution to:
e-Print:
DOI:
Report number:
  • BELLE-CONF-0436,
  • ICHEP04-8-0683,
  • BELLE-PRERPINT-2004-31,
  • KEK-PREPRINT-2004-63
Experiments:
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Abstract: (arXiv)
We present a precise measurement of the standard model CP-violation parameter sin(2phi1), the direct CP violation parameter |lambda|, the lifetimes of charged and neutral B mesons and their ratio, and the B0-B0bar mixing parameter Delta m_d based on a sample of 152 x 10^6 BB-bar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One of two B mesons is fully reconstructed in a CP-eigenstate or a flavor-eigenstate decay channel. The flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time interval between the two B meson decay points, we obtain sin(2phi1) = 0.728 +/- 0.056(stat) +/- 0.023(syst), |lambda| = 1.007 +/- 0.041(stat) +/- 0.033(syst), tau_B0 = 1.534 +/- 0.008(stat) +/- 0.010(syst) ps, tau_B+ = 1.635 +/- 0.011(stat) +/- 0.011(syst) ps, tau_B+/tau_B0 = 1.066 +/- 0.008(stat) +/- 0.008(syst) and Delta m_d = 0.511 +/- 0.005(stat) +/- 0.006(syst) ps-1. The results for sin(2phi1) and |lambda| are the most precise measurements performed so far, and are consistent with the standard model expectations. The significance of the observed deviation from unity in the lifetime ratio exceeds five standard deviations.
Note:
  • 20 pages, 10 figures, submitted to Physical Review D, also contributed to ICHEP2004, Beijing, China
  • 11.30.Er
  • 12.15.Hh
  • 13.25.Hw
  • talk: Beijing 2004/08/16
  • electron positron: colliding beams
  • electron positron: annihilation
  • Upsilon(10570): electroproduction
  • B: pair production
  • B: hadronic decay
  • particle identification: flavor