Isospin breaking and the extraction of ms from the τ-decay-like vector current sum rule

1998/04/15 by Kim Maltman · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1016/s0370-2693(98)00367-0

published as Phys.Lett. B428 (1998) 179-185 · 6 pages, Latex, to appear in Phys. Lett. B

arxiv created 1998/04/15 · openalex publication_date 1998/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Narison's τ-decay-like sum rule for determining the strange quark mass is re-investigated, taking into account isospin-breaking corrections in the extraction of the input spectral functions from e⁺e^-→ hadrons data. The corrections, estimated using experimental data on vector meson electromagnetic decay constants and a QCD sum rule analysis of the 38 vector current correlator, are shown to be especially large for the isoscalar case. The reason such large corrections are natural is also explained. Due to the high degree of cancellation in the original sum rule, the effect of these corrections on the determination of m_s is significant. A new central value m_s=113-138 MeV is found, in the MS scheme at 1 GeV², with significant (asymmetric) errors associated with errors in the input experimental data.

Citations

• Light quark masses in QCD
• Problems with extractingmsfrom flavor breaking in hadronic τ decays
• Decay Correlations of Heavy Leptons ine++e−→l++l−
• On the QCD sum rule determination of the strange quark mass
• The strange quark mass from QCD sum rules
• Order-αs3 determination of the strange quark mass
• Review of particle properties

Cited by

• Problems with extractingmsfrom flavor breaking in hadronic τ decays
• Strange quark mass frome+e−revisited and present status of light quark masses