PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Strong Interactions and Hadron Physics
Determination of the strong coupling constant $\alpha_s (m_Z )$ in next-to-next-to-leading order QCD using H1 jet cross section measurements
D. Britzger*  on behalf of the H1 Collaboration
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Published on: August 02, 2019
The strong coupling constant is one of the least known parameters of the Standard Model (SM) and a precise knowledge is of great importance for precision physics and searches for physics beyond the SM at the LHC. The value of the strong coupling constant \asmz\ is determined from inclusive jet and dijet cross sections in neutral-current deep-inelastic $ep$ scattering (DIS) measured at HERA by the H1 collaboration using next-to-next-to-leading order (NNLO) QCD predictions. Using inclusive jet and dijet data together, the strong coupling constant is determined to be $\alpha_s(M_Z)=0.1157(20)_{\rm exp}(29)_{\rm th}$. Complementary, $\alpha_s(M_Z)$ is determined together with parton distribution functions of the proton (PDFs) from jet and inclusive DIS data measured by the H1 experiment. The value $\alpha_s(M_Z)=0.1142(28)_{\rm tot}$ obtained is consistent with the determination from jet data alone. The impact of the jet data on the PDFs is studied. The running of the strong coupling is tested at different values of the renormalisation scale and the results are found to be in agreement with expectations.
DOI: https://doi.org/10.22323/1.340.0448
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