Электронный каталог

Статья

d'Enterria, D.
The Strong Coupling Constant: State of the Art and the Decade Ahead / D.d'Enterria, A.V.Kotikov, V.G.Krivokhizhin, A.V.Nesterenko, B.G.Shaikhatdenov, [a.o.] // Journal of Physics G [Electronic resource]. – 2024. – Vol. 51, No. 9. – P. 090501. – URL: https://doi.org/10.1088/1361-6471/ad1a78. – Bibliogr.: 608.

Theoretical predictions for particle production cross sections and decays at colliders rely heavily on perturbative Quantum Chromodynamics (QCD) calculations, expressed as an expansion in powers of the strong coupling constant αS. The current O(1%) uncertainty of the QCD coupling evaluated at the reference Z boson mass, a&sub(S)(m*2&sub(Z))=0.1179*(0.0009 , is one of the limiting factors to more precisely describe multiple processes at current and future colliders. A reduction of this uncertainty is thus a prerequisite to perform precision tests of the Standard Model as well as searches for new physics. This report provides a comprehensive summary of the state-of-the-art, challenges, and prospects in the experimental and theoretical study of the strong coupling. The current a&sub(S)(m*2&sub(Z)) world average is derived from a combination of seven categories of observables: (i) lattice QCD, (ii) hadronic τ decays, (iii) deepinelastic scattering and parton distribution functions fits, (iv) electroweak boson decays, hadronic final-states in (v)e*+e*−, (vi) e–p, and (vii) p–p collisions, and (viii) quarkonia decays and masses. We review the current status of each of these seven *a&sub(S)(m*2&sub(Z)) extraction methods, discuss novel αS determinations, and examine the averaging method used to obtain the world-average value. Each of the methods discussed provides a ‘wish list’ of experimental and theoretical developments required in order to achieve the goal of a permille precision on *a&sub(S)(m*2&sub(Z)) within the next decade.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 323.5 - Теория взаимодействия частиц при высоких энергиях$
Спец.(статьи,препринты) = С 324.1б - Сильные взаимодействия. Электромагнитная структура частиц. Алгебра токов. Киральные теории. Теория Редже$