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Электронный каталог: Kataev, A. L. - Perturbative QCD Fitting of KEDR and BESIII e*+e*- Data for R(s) and *a&sub(s) Determination
Kataev, A. L. - Perturbative QCD Fitting of KEDR and BESIII e*+e*- Data for R(s) and *a&sub(s) Determination
Статья
Автор: Kataev, A. L.
Natural Science Review: Perturbative QCD Fitting of KEDR and BESIII e*+e*- Data for R(s) and *a&sub(s) Determination
б.г.
ISBN отсутствует
Автор: Kataev, A. L.
Natural Science Review: Perturbative QCD Fitting of KEDR and BESIII e*+e*- Data for R(s) and *a&sub(s) Determination
б.г.
ISBN отсутствует
На полку
Статья
Kataev, A.L.
Perturbative QCD Fitting of KEDR and BESIII e*+e*- Data for R(s) and *a&sub(s) Determination / A.L.Kataev, K.Yu.Todyshev. – Text : electronic // Natural Science Review. – 2026. – Vol. 3, No. 8. – P. 100801. – URL: https://doi.org/10.54546/NaturalSciRev.100801. – Bibliogr.: 90.
The experimental data collected by KEDR and BESIII collaborations at the energies below charm quark thresholds are compared with the massless QCD expressions for the (e^+e^-) annihilation R-ratio truncated at different orders of perturbation theory. The fits demonstrate the dependence of the extracted (alpha_s(M_Z)) values on the orders of 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 scale of mass of (J/Psi) meson, give the following results (alpha_s(M_Z)=0.1151_{-0.0069}^{+0.0052}), (alpha_s(M_Z)=0.1190_{-0.0081}^{+0.0064}) and (alpha_s(M_Z)=0.1283_{-0.0075}^{+0.0028}). The increasing tendency of fitted (alpha_s(M_Z)) value is associated with the effects of not totally controlled within asymptotic perturbation theory expansions kinematical (pi^2) contributions to R-ratio coefficients due to analytical continuation from the space-like to time-like energy regions. The applications of the fixed orders of perturbation theory expansions and careful treatment of the analytical continuation effects are commented.
ОИЯИ = ОИЯИ (JINR)2026
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки
Спец.(статьи,препринты) = С 324.1д - Квантовая хромодинамика$
Kataev, A.L.
Perturbative QCD Fitting of KEDR and BESIII e*+e*- Data for R(s) and *a&sub(s) Determination / A.L.Kataev, K.Yu.Todyshev. – Text : electronic // Natural Science Review. – 2026. – Vol. 3, No. 8. – P. 100801. – URL: https://doi.org/10.54546/NaturalSciRev.100801. – Bibliogr.: 90.
The experimental data collected by KEDR and BESIII collaborations at the energies below charm quark thresholds are compared with the massless QCD expressions for the (e^+e^-) annihilation R-ratio truncated at different orders of perturbation theory. The fits demonstrate the dependence of the extracted (alpha_s(M_Z)) values on the orders of 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 scale of mass of (J/Psi) meson, give the following results (alpha_s(M_Z)=0.1151_{-0.0069}^{+0.0052}), (alpha_s(M_Z)=0.1190_{-0.0081}^{+0.0064}) and (alpha_s(M_Z)=0.1283_{-0.0075}^{+0.0028}). The increasing tendency of fitted (alpha_s(M_Z)) value is associated with the effects of not totally controlled within asymptotic perturbation theory expansions kinematical (pi^2) contributions to R-ratio coefficients due to analytical continuation from the space-like to time-like energy regions. The applications of the fixed orders of perturbation theory expansions and careful treatment of the analytical continuation effects are commented.
ОИЯИ = ОИЯИ (JINR)2026
Спец.(статьи,препринты) = С 332.7 - Встречные е+е- и мю+мю- пучки
Спец.(статьи,препринты) = С 324.1д - Квантовая хромодинамика$
