English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

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^0system using 72.2 fb^-1 of data recorded with the Belle detector at the KEKBasymmetric-energy e^+ e^- collider. The branching fraction obtained is (25.24+/- 0.01 +/- 0.39)%, where the first error is statistical and the second issystematic. The unfolded pi^- pi^0 mass spectrum is used to determine resonanceparameters for the rho(770), rho'(1450), and rho"(1700) mesons. We also usethis spectrum to estimate the hadronic (2pi) contribution to the anomalousmagnetic 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 thefirst error is due to the experimental uncertainties, the second is due to theuncertainties in the branching fractions and the third is due to theuncertainties in the isospin-violating corrections.

High-Statistics Study of the tau^- -> pi^- pi^0 nu_tau Decay