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Determination of the strong coupling constant as(mZ) in next-to-next-to-leading order QCD using H1 jet cross section measurements
journal contribution
posted on 2023-06-09, 19:31 authored by Mark SuttonMark Sutton, . H1 CollaborationThe strong coupling constant as 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. The dependence of the NNLO predictions and of the resulting value of as(mZ) at the Z-boson mass mZ are studied as a function of the choice of the renormalisation and factorisation scales. Using inclusive jet and dijet data together, the strong coupling constant is determined to be as(mZ)=0.1157(20)exp(29)th . Complementary, as(mZ) is determined together with parton distribution functions of the proton (PDFs) from jet and inclusive DIS data measured by the H1 experiment. The value as(mZ)=0.1142(28)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.
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- Published
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- Published version
Journal
European Physical Journal C: Particles and FieldsISSN
1434-6044Publisher
EDP SciencesExternal DOI
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791Volume
77Page range
1-21Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-11-01First Open Access (FOA) Date
2019-11-01First Compliant Deposit (FCD) Date
2019-10-31Usage metrics
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