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Related Experiment Videos

Observation of B-/+-->rho-/+rho0 decays.

J Zhang1, M Nakao, K Abe

  • 1Aomori University, Aomori, Japan.

Physical Review Letters
|December 20, 2003
PubMed

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Summary

Researchers observed the charmless vector-vector decay B-/+-->rho(-/+)rho(0) for the first time. The study measured its branching fraction, longitudinal polarization, and direct CP violation using Belle detector data.

Area of Science:

  • Particle Physics
  • High Energy Physics
  • B Physics

Background:

  • Understanding B meson decays provides insights into the Standard Model of particle physics.
  • Charmless decays are crucial for probing New Physics beyond the Standard Model.

Purpose of the Study:

  • To report the first observation of the B-/+-->rho(-/+)rho(0) decay.
  • To measure the branching fraction, longitudinal polarization, and direct CP-violating asymmetry for this decay.

Main Methods:

  • Analysis of a 78 fb(-1) data sample collected with the Belle detector at the KEKB asymmetric e(+)e(-) collider.
  • Operating at the Upsilon(4S) resonance.
  • Analysis of rho helicity-angle distributions.

Main Results:

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  • Observed the charmless vector-vector decay B-/+-->rho(-/+)rho(0).
  • Measured branching fraction B(B-/+-->rho(-/+)rho(0)) = [31.7+/-7.1(stat)+3.8-6.7(syst)]x10(-6).
  • Determined longitudinal polarization fraction Gamma(L)/Gamma = 0.95+/-0.11(stat)+/-0.02(syst).
  • Measured direct CP-violating asymmetry A(CP)(B-/+-->rho(-/+)rho(0)) = 0.00+/-0.22(stat)+/-0.03(syst).

Conclusions:

  • The first observation of this decay provides a new channel for studying CP violation.
  • The high longitudinal polarization suggests specific underlying dynamics for this decay.
  • The measured direct CP-violating asymmetry is consistent with zero, constraining theoretical models.