Scalar K pi form factor and light quark masses

Abstract

Recent experimental improvements on K-decay data allow for a precise extraction of the strangeness-changing scalar K pi form factor and the related strange scalar spectral function. On the basis of this scalar as well as the corresponding pseudoscalar spectral function, the strange quark mass is determined to be m_s(2 GeV) = 92 +- 9 MeV. Further taking into account chiral perturbation theory mass ratios, the light up and down quark masses turn out to be m_u(2 GeV) = 2.7 +- 0.4 MeV as well as m_d(2 GeV) = 4.8 +- 0.5 MeV. As a by-product, we also find a value for the Cabibbo angle |V_{us}| = 0.2236(29) and the ratio of meson decay constants F_K/F_π= 1.203(16). Performing a global average of the strange mass by including extractions from other channels as well as lattice QCD results yields m_s(2 GeV) = 94 +- 6 MeV.

5 pages, 2 figures; comparison with lattice and global average added; version to appear in Phys. Rev. D

Cited by in corpus (35)

• Form Factors from Light-Cone Sum Rules with B-Meson Distribution Amplitudes
• Light-cone sum rules for $B\to \pi$ form factors revisited
• Twist-4 Distribution Amplitudes of the K${}^{\ast }$ and $\varphi$ Mesons in QCD
• Spectral distribution for the decay tau -> nu_tau K pi
• K pi vector form factor, dispersive constraints and tau -> nu_tau K pi decays
• B, Bs -> K form factors: an update of light-cone sum rule results
• What can be learned from the Belle spectrum for the decay tau- -> nu_tau K_S pi-
• Towards NNLO Accuracy in the QCD Sum Rule for the Kaon Distribution Amplitude
• $\bar{q}q$ condensate for light quarks beyond the chiral limit
• |V_us| and m_s from hadronic tau decays
• A new type of CP symmetry, family replication and fermion mass hierarchies
• Matching Chiral Perturbation Theory and the Dispersive Representation of the Scalar Kpi Form Factor
• Scalar radius of the pion and zeros in the form factor
• Tests of non-standard electroweak couplings of right-handed quarks
• The Kl3 scalar form factors in the standard model
• Constraints on the form factors for K --> pi l nu and implications for V_us
• Strange quark mass from Finite Energy QCD sum rules to five loops
• Tau Physics: Theory Overview
• Kpi form factors and final state interactions in D+ --> K- pi+ pi+ decays
• Up and down quark masses from Finite Energy QCD sum rules to five loops
• Low-energy pi-pi and pi-K scatterings revisited in three-flavour resummed chiral perturbation theory
• A Mixed Tau-Electroproduction Sum Rule for V_us
• Status of the Hadronic tau Decay Determination of |V_{us}|
• Upper bounds on $f_D$ and $f_{D_s}$ from two-point correlation function in QCD
• Joint Extraction of m_s and V_us from Hadronic Tau Decays
• Tau Physics 2006: Summary & Outlook
• Next-to-Leading Order perturbative QCD corrections to baryon correlators in matter
• Light quark masses from QCD sum rules with minimal hadronic bias
• Vus and lepton universality from kaon decays with the KLOE detector
• Theoretical progress on the V_us determination from tau decays
• Recent Progress on Tau Lepton Physics
• Bounds on the Light Quark Masses: the scalar channel revisited
• The Joint Extraction of m_s and V_us From Hadronic Tau Decay Data
• Analysis of tau -> Ks pion nu_tau Belle data in a chiral framework
• Can we probe right-handed charged quark currents?