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The width difference of rho vector mesons

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arxiv 0708.3256 v1 pith:MNXCOATV submitted 2007-08-23 hep-ph

classification hep-ph
keywords differencemesonsbreakingchargeddeltagammaisospinmass
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

We compute the difference in decay widths of charged and neutral \rho(770) vector mesons. The isospin breaking arising from mass differences of neutral and charged \pi and \rho mesons, radiative corrections to \rho -> \pi\pi, and the \rho -> \pi\pi\gamma decays are taken into account. It is found that the width difference \Delta \Gamma_rho is very sensitive ot the isospin breaking in the $\rho$ meson mass \Delta m_\rho. This result can be useful to test the correlations observed between the values of these parameters extracted from experimental data.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Isospin-breaking effects in inclusive hadronic $\tau$ data for the muon $(g-2)$ from first principles

    hep-lat 2026-07 unverdicted novelty 6.0 of 10

    A lattice QCD+QED strategy is outlined for calculating isospin-breaking effects in inclusive tau decays to support high-precision HVP contributions to muon g-2.

  2. Data-based form factor corrections between the two-pion $\tau$ and $e^+e^-$ spectral functions

    hep-ph 2025-04 conditional novelty 6.0 of 10

    A data-only extraction of the charged versus neutral rho mass and width differences gives a total isospin-breaking correction of -(12.2 +/- 3.4) x 10^-10 to the tau-based hadronic vacuum polarization contribution to t...

  3. The anomalous magnetic moment of the muon in the Standard Model: an update

    hep-ph 2025-05 accept novelty 5.0 of 10

    The updated SM prediction for the muon anomalous magnetic moment is 116592033(62)×10^{-11}, showing no tension with the experimental average of 38(63)×10^{-11}.

  4. Compatibility between $e^+e^-$ and $\tau$ decay data in the di-pion channel and implications for $a_\mu^\mathrm{SM}$ and CVC tests

    hep-ph 2024-11 conditional novelty 4.0 of 10

    Updated isospin-breaking corrections bring tau decay data into agreement with the new CMD-3 e+e- result, supporting a tau-based hadronic vacuum polarization estimate that reduces the muon g-2 tension to 2.7 sigma.

  5. The anomalous magnetic moment of the muon in the Standard Model

    hep-ph 2020-06 accept novelty 2.0 of 10

    The Standard Model value for the muon anomalous magnetic moment is 116591810(43)×10^{-11}, 3.7σ below the Brookhaven experimental measurement.

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