Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-05-24
Phys.Rev.D78:072006,2008
Physics
High Energy Physics
High Energy Physics - Experiment
38 pages, 12 figures, matches PRD version
Scientific paper
10.1103/PhysRevD.78.072006
We report a high-statistics measurement of the branching fraction for tau^- --> pi^- pi^0 nu_tau and the invariant mass spectrum of the produced pi^- pi^0 system using 72.2 fb^-1 of data recorded with the Belle detector at the KEKB asymmetric-energy e^+ e^- collider. The branching fraction obtained is (25.24 +/- 0.01 +/- 0.39)%, where the first error is statistical and the second is systematic. The unfolded pi^- pi^0 mass spectrum is used to determine resonance parameters for the rho(770), rho'(1450), and rho"(1700) mesons. We also use this spectrum to estimate the hadronic (2pi) contribution to the anomalous magnetic moment of the muon (a_{mu}^{pipi}). Our result for a_{mu}^{pipi} integrated over the mass range sqrt{s} = 2m_{pi} - 1.8 GeV/c^2 is a_{mu}^{pipi} = (523.5 +/- 1.5 (exp) +/- 2.6 (Br) +/- 2.5 (isospin))x 10^{-10}, where the first error is due to the experimental uncertainties, the second is due to the uncertainties in the branching fractions and the third is due to the uncertainties in the isospin-violating corrections.
Eidelman Shmuel
for the Belle Collaboration
Fujikawa Mari
Hayashii Hisaki
No associations
LandOfFree
High-Statistics Study of the tau^- -> pi^- pi^0 nu_tau Decay does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High-Statistics Study of the tau^- -> pi^- pi^0 nu_tau Decay, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-Statistics Study of the tau^- -> pi^- pi^0 nu_tau Decay will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-666127