Strong coupling from an improved <math display='inline'> <mi>?</mi> </math> vector isovector spectral function
نویسندگان
چکیده
We combine ALEPH and OPAL results for the spectral distributions measured in $\tau\to\pi^-\pi^0\nu_\tau$, $\tau\to 2\pi^-\pi^+\pi^0\nu_\tau$ $\tau\to\pi^-3\pi^0\nu_\tau$ decays with (i) recent BaBar analogous K^- K^0\nu_\tau$ distribution (ii) estimates of contributions from other hadronic $\tau$-decay modes obtained using CVC electroproduction data, to obtain a new more precise non-strange, inclusive vector, isovector function. The $K^- K^0$ CVC/electroproduction provide us alternate, entirely data-based input all exclusive which employed Monte-Carlo-based estimates. use resulting function determine $\alpha_s(m_\tau)$, strong coupling at $\tau$ mass scale, employing finite energy sum rules. Using fixed-order perturbation theory (FOPT) prescription, we find $\alpha_s(m_\tau)=0.3077\pm 0.0075$, corresponds five-flavor result $\alpha_s(M_Z)=0.1171\pm 0.0010$ $Z$ mass. While also an estimate contour-improved (CIPT), point out that FOPT prescription is be preferred comparison $\alpha_s$ determinations $\overline{{\rm MS}}$ scheme, especially given inconsistency between CIPT standard operator product expansion recently pointed literature. Additional experimental on dominant $2\pi$ $4\pi$ would allow further improvements current analysis.
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ژورنال
عنوان ژورنال: Physical review
سال: 2021
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevd.103.034028