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High Energy Physics - Phenomenology

Title: QCD parameters and SM-high precision from $e^+e^-$ to Hadrons: Updated

Authors: Stephan Narison (LUPM CNRS/IN2P3, Univ. Montpellier, and iHEPMAD, Univ. Antananarivo - MG)
Abstract: 1. I update my previous comparison of the theoretical value of the muon anomaly with the new measurement and found $\Delta a_\mu\equiv a_\mu^{exp}-a_\mu^{th} = (143\pm 42_{th}\pm 22_{exp})\times 10^{-11}$ which is about 3$\sigma$ discrepancy between the SM predictions and experiment. 2. I improve the estimate of QCD power corrections up to dimension D=12 and provide a new estimate of the ones up to D=20 within the SVZ expansion by combining the ratio of the Laplace sum rules (LSR) with the BNP $\tau$-like decay moments for the I=1 vector current. The results in Table 1 confirm a violation of the factorization of the four-quark condensates and the value of the gluon one $ <\alpha_s G^2>$ from some other sources. Up to D=20, I there is not any factorial nor exponential growth of the size of these power corrections. 3. I use these new values of power corrections to extract $\alpha_s$ from the BNP lowest moment. To order $\alpha_s^4$, I find within the SVZ expansion: $\alpha_s(M_\tau)= 0.3081(50)_{fit}(71)_{\alpha_s^5}$ [resp. $0.3260 (47)_{fit}(62)_{\alpha_s^5}]$ implying $\alpha_s(M_Z)= 0.1170(6)(3)_{evol}$ [resp. $0.1192(6)(3)_{evol}$] for Fixed Order (FO) [resp. Contour Improved (CI)] PT series. They lead to the mean: $ \alpha_s(M_\tau)\vert_{SVZ}=0.3179(58)_{fit}(81)_{syst}$ and $ \alpha_s(M_Z)\vert_{SVZ}= 0.1182(12)(3)_{evol}$ where the systematic error(syst) takes into account the discrepancy between FO and CI. Using the lowest BNP moment, we also obtain from the vector (V) component of $\tau$-decay the mean: $ \alpha_s(M_\tau)\vert_{\tau,V}=0.3219(52)(91)_{syst}$ giving: $\alpha_s(M_Z)\vert_{\tau,V}=0.1187(13)(3)_{evol}$. The average of the two determinations leads to: $ \alpha_s(M_\tau)=0.3198(72)$ and $\alpha_s(M_Z)= 0.1185(9)(3)_{evol}$. 4. Some contributions beyond the SVZ expansion ($1/Q^2$, instantons and duality violation) expected to be small are discussed in Sections 10,11.
Comments: Latex sources, 19 pages, 8 figures, 3 tables. Some preliminaries results have been presented at the alphas2024 workshop (5-9th february 2024-ECT*-Trento-IT). Section 9 on the determination of alpha_s from tau-decay has been corrected. Version published in Nucl. Phys. A + Corrigendum (to appear in Nucl. Phys. A)
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex); High Energy Physics - Lattice (hep-lat)
DOI: 10.1016/j.nuclphysa.2024.122873
Cite as: arXiv:2402.13983 [hep-ph]
  (or arXiv:2402.13983v5 [hep-ph] for this version)

Submission history

From: Stephan Narison [view email]
[v1] Wed, 21 Feb 2024 18:11:14 GMT (1454kb,D)
[v2] Thu, 22 Feb 2024 16:43:55 GMT (1454kb,D)
[v3] Tue, 16 Apr 2024 13:56:55 GMT (1453kb,D)
[v4] Thu, 18 Apr 2024 05:02:51 GMT (1453kb,D)
[v5] Thu, 25 Apr 2024 16:52:29 GMT (1454kb,D)

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