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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.29803 |
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| _version_ | 1866917394134335488 |
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| author | Kataev, A. L. Todyshev, K. Yu. |
| author_facet | Kataev, A. L. Todyshev, K. Yu. |
| contents | The experimental data collected by KEDR and BESIII collaborations at the energies below charm quark thresholds are compared with the QCD expressions for the $e^+e^-$ annihilation R-ratio truncated at different orders of perturbation theory. The fits demonstrate the dependence of the extracted $α_s(M_Z)$ values from orders of the truncation of the corresponding approximations. The next-to-leading order, next-to-next-to-leading order and next-to-next-to-next-to-leading order fits of the combined KEDR data and BESIII data , truncated at the mass scale of $J/Ψ$ meson, give the following results $α_s(M_Z)= 0.1179^{+0.0051}_{-0.0069}$,$α_s(M_Z)=0.1221^{+0.0063}_{-0.0080}$ and $α_s(M_Z)=0.1312^{+0.0027}_{-0.0067}$. The subjects related to the applications of the fixed orders of perturbation theory expansions and careful treatment of the analytical continuation effects are commented. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_29803 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Perturbative QCD fitting of KEDR and BESIII $e^+e^-$ data for R(s) and $α_s$ determination Kataev, A. L. Todyshev, K. Yu. High Energy Physics - Phenomenology High Energy Physics - Experiment The experimental data collected by KEDR and BESIII collaborations at the energies below charm quark thresholds are compared with the QCD expressions for the $e^+e^-$ annihilation R-ratio truncated at different orders of perturbation theory. The fits demonstrate the dependence of the extracted $α_s(M_Z)$ values from orders of the truncation of the corresponding approximations. The next-to-leading order, next-to-next-to-leading order and next-to-next-to-next-to-leading order fits of the combined KEDR data and BESIII data , truncated at the mass scale of $J/Ψ$ meson, give the following results $α_s(M_Z)= 0.1179^{+0.0051}_{-0.0069}$,$α_s(M_Z)=0.1221^{+0.0063}_{-0.0080}$ and $α_s(M_Z)=0.1312^{+0.0027}_{-0.0067}$. The subjects related to the applications of the fixed orders of perturbation theory expansions and careful treatment of the analytical continuation effects are commented. |
| title | Perturbative QCD fitting of KEDR and BESIII $e^+e^-$ data for R(s) and $α_s$ determination |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2603.29803 |