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Measurement of the lifetime difference between Bs mass eigenstates.

D Acosta1, J Adelman, T Affolder

  • 1University of Florida, Gainesville, Florida 32611, USA.

Physical Review Letters
|March 24, 2005
PubMed
Summary

Researchers measured lifetimes and polarization amplitudes for B(0)(s) and B(0)(d) decays. For the first time, they determined the distinct lifetimes of the B(0)(s) system

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Quantum Mechanics

Background:

  • Understanding B meson decays is crucial for testing the Standard Model of particle physics.
  • CP violation in the B(0)(s) system provides insights into matter-antimatter asymmetry.
  • Previous studies lacked precise measurements of the lifetimes of the heavy and light mass eigenstates.

Purpose of the Study:

  • To measure the lifetimes and polarization amplitudes for B(0)(s)-->J/psiphi and B(0)(d)-->J/psiK(*0) decays.
  • To separately measure the lifetimes of the heavy and light mass eigenstates in the B(0)(s) system for the first time.
  • To determine the relative contributions of amplitudes with definite CP as a function of decay time.

Main Methods:

  • Analysis of B(0)(s)-->J/psiphi and B(0)(d)-->J/psiK(*0) decay data.
  • Measurement of lifetimes using the time-dependent decay rates.
  • Determination of CP properties through polarization amplitude analysis.

Main Results:

  • Measured lifetimes for B(0)(s) eigenstates: tau(L) = (1.05(+0.16)(-0.13) +/- 0.02) ps and tau(H) = (2.07(+0.58)(-0.46) +/- 0.03) ps.
  • Calculated the difference in decay rates: DeltaGamma(s)/Gamma(s) = (65(+25)(-33) +/- 1)%.
  • Determined the average decay rate difference: DeltaGamma(s) = (0.47(+0.19)(-0.24) +/- 0.01) ps(-1).

Conclusions:

  • The study provides the first separate measurements of B(0)(s) heavy and light eigenstate lifetimes.
  • The results offer new precision for understanding CP violation and decay dynamics in the B(0)(s) system.
  • These measurements contribute to stringent tests of the Standard Model in flavor physics.