Strong coupling from e + e − → hadrons below charm

Boito, Diogo; Golterman, Maarten; Keshavarzi, Alexander; Maltman, Kim; Nomura, Daisuke; Peris, Santiago; Teubner, Thomas

doi:10.1103/PhysRevD.98.074030

Title: Strong coupling from $e^{+} e^{-} \to hadrons$ below charm

Journal Article · Wed Oct 31 00:00:00 EDT 2018 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.98.074030· OSTI ID:1480155

Boito, Diogo; Golterman, Maarten; Keshavarzi, Alexander; Maltman, Kim; Nomura, Daisuke; Peris, Santiago; Teubner, Thomas

We use a new compilation of the hadronic R-ratio from available data for the process e⁺e^– →hadrons to determine the strong coupling, αs. We make use of all data for the R-ratio from threshold to a center-of-mass energy of 2 GeV by employing finite-energy sum rules. Data above 2 GeV, for which at present far fewer high-precision experimental data are available, do not provide much additional constraint but are fully consistent with the values for αs we obtain. Quoting our results at the τ mass to facilitate comparison to the results obtained from analogous analyses of hadronic τ-decay data, we find α_s(m$$^{2}_{τ}$$) = 0.298 ± 0.016 ± 0.006 in fixed-order perturbation theory, and α_s(m$$^{2}_{τ}$$) = 0.304 ± 0.018 ± 0.006 in contour-improved perturbation theory, where the first error is statistical, and the second error reflects our estimate of various systematic effects. These values are in good agreement with a recent determination from the OPAL and ALEPH data for hadronic τ decays.

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Research Organization:: San Francisco State Univ., CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG03-92ER40711; FPA2014-55613-P; 2014-SGR-1450

OSTI ID:: 1480155

Alternate ID(s):: OSTI ID: 1614580

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 98 Journal Issue: 7; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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