The Strange Quark Mass, alpha_s and the Chiral Limit Electroweak Penguin Matrix Elements From Hadronic Tau Decay Data

Abstract

Hadronic tau decay data provides access to the light quark vector (V) and axial vector (A) spectral functions. This makes possible investigations of the dynamics of QCD at intermediate scales and improved determinations of certain QCD/Standard Model parameters. We discuss three such applications: (1) the investigation of the nature of duality violation in QCD at intermediate scales (and its relation to the determination of alpha_s); (2) the extraction of m_s from flavor-breaking differences of flavor 'ud' and 'us' data; and (3) the determination of the dimension D=6 term in the OPE for the flavor 'ud' V-A correlator difference. The latter is relevant to the evaluation of the chiral limit values of the K-->pi pi electroweak penguin matrix elements, and hence to our understanding of expectations for epsilon'/epsilon in the Standard Model.

Invited talk at the Seventh International Workshop on Tau Lepton Physics (TAU02-WE05), Santa Cruz, CA, USA, September 2002, 18 pages, LATEX, 7 eps figures

References in corpus (7)

• Strangeness-changing scalar form factors
• Light quark masses from scalar sum rules
• Matching the Electroweak Penguins $Q_7$, $Q_8$ and Spectral Correlators
• Strange Quark Mass from the Invariant Mass Distribution of Cabibbo-Suppressed Tau Decays
• Improved Determination of the Electroweak Penguin Contribution to epsilon'/epsilon in the Chiral Limit
• Determination of <2pi_{I=2}|Q_{7,8}|K0> in the Chiral Limit
• m_u+m_d From Isovector Pseudoscalar Sum Rules

Cited by in corpus (15)

• Z^* Resonances: Phenomenology and Models
• Alpha_s(M_Z) from hadronic tau decays
• Improved Determination of the Electroweak Penguin Contribution to epsilon'/epsilon in the Chiral Limit
• QCD Condensates for the Light Quark V-A Correlator
• Measurement of the tau- --> K- pi0 nu_tau Branching Fraction
• Measurement of the Strange Spectral Function in Hadronic tau Decays
• V_us From Hadronin Tau Decays
• A Mixed Tau-Electroproduction Sum Rule for V_us
• Constraints on the I=1 hadronic tau decay and e^+e^- --> hadrons data sets and implications for (g-2)_mu
• V_us From Hadronic Tau Decays
• Joint Extraction of m_s and V_us from Hadronic Tau Decays
• Determination of the numerical value for the strong coupling constant from tau decays in perturbative QCD
• Electroweak Penguins and Large Nc
• The Joint Extraction of m_s and V_us From Hadronic Tau Decay Data
• Status of the Lattice and Tau Decay Determinations of alpha_s