The case for duality violations in the analysis of hadronic τ decays

Santiago Peris; Diogo Boito; Maarten Golterman; Kim Maltman

doi:10.1142/S0217732316300317

The case for duality violations in the analysis of hadronic τ decays

Santiago Peris, Diogo Boito, Maarten Golterman, Kim Maltman

Research output: Contribution to journal › Review article › Research › peer-review

9 Citations (Scopus)

Abstract

© 2016 World Scientific Publishing Company. In this review, we discuss why, in the determination of αs(mτ2) from hadronic τ decays, two important assumptions made in most of previous analyses, namely the neglect of higher-dimension condensates and of duality violations (DVs), have introduced uncontrolled systematic errors into this determination. Although the use of pinched weights is usually offered as a justification of these assumptions, we explain why it is not possible to simultaneously suppress these two contributions; particularly since the Operator Product Expansion (OPE) is expected to be an asymptotic, rather than a convergent expansion. There is not only experimental and theoretical evidence for DVs but they also affect the extraction of αs(mτ2).

Original language	English
Article number	1630031
Journal	Modern Physics Letters A
Volume	31
Issue number	30
DOIs	https://doi.org/10.1142/S0217732316300317
Publication status	Published - 28 Sep 2016

Keywords

QCD
α s
τ decays

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abstract = "{\textcopyright} 2016 World Scientific Publishing Company. In this review, we discuss why, in the determination of αs(mτ2) from hadronic τ decays, two important assumptions made in most of previous analyses, namely the neglect of higher-dimension condensates and of duality violations (DVs), have introduced uncontrolled systematic errors into this determination. Although the use of pinched weights is usually offered as a justification of these assumptions, we explain why it is not possible to simultaneously suppress these two contributions; particularly since the Operator Product Expansion (OPE) is expected to be an asymptotic, rather than a convergent expansion. There is not only experimental and theoretical evidence for DVs but they also affect the extraction of αs(mτ2).",

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T1 - The case for duality violations in the analysis of hadronic τ decays

AU - Peris, Santiago

AU - Boito, Diogo

AU - Golterman, Maarten

AU - Maltman, Kim

PY - 2016/9/28

Y1 - 2016/9/28

N2 - © 2016 World Scientific Publishing Company. In this review, we discuss why, in the determination of αs(mτ2) from hadronic τ decays, two important assumptions made in most of previous analyses, namely the neglect of higher-dimension condensates and of duality violations (DVs), have introduced uncontrolled systematic errors into this determination. Although the use of pinched weights is usually offered as a justification of these assumptions, we explain why it is not possible to simultaneously suppress these two contributions; particularly since the Operator Product Expansion (OPE) is expected to be an asymptotic, rather than a convergent expansion. There is not only experimental and theoretical evidence for DVs but they also affect the extraction of αs(mτ2).

AB - © 2016 World Scientific Publishing Company. In this review, we discuss why, in the determination of αs(mτ2) from hadronic τ decays, two important assumptions made in most of previous analyses, namely the neglect of higher-dimension condensates and of duality violations (DVs), have introduced uncontrolled systematic errors into this determination. Although the use of pinched weights is usually offered as a justification of these assumptions, we explain why it is not possible to simultaneously suppress these two contributions; particularly since the Operator Product Expansion (OPE) is expected to be an asymptotic, rather than a convergent expansion. There is not only experimental and theoretical evidence for DVs but they also affect the extraction of αs(mτ2).

KW - QCD

KW - α s

KW - τ decays

U2 - 10.1142/S0217732316300317

DO - 10.1142/S0217732316300317

M3 - Review article

VL - 31

JO - Modern Physics Letters A

JF - Modern Physics Letters A

SN - 0217-7323

IS - 30

M1 - 1630031

ER -