Determination of the strong coupling at NNLO from jet production in DIS

Abstract

A first determination of the strong coupling ${\alpha }_s(m_Z)$ in next-to-next-to-leading order (NNLO) from inclusive jet and dijet production cross sections in deep-inelastic scattering at HERA is presented. Data collected by the H1 experiment in the years 1995 to 2007 covering the range of momentum transfer $5.5<Q^2<15000{\mathrm{GeV}}^2$ and jet transverse momenta $P_T>4.5\mathrm{GeV}$ are explored. The strong coupling is determined in a fit to inclusive jet and dijet data to ${\alpha }_s(m_Z)=0.1157(6{)}_{\exp }{(}_{-26}^{+31}{)}_{\mathrm{theo}}$. Further studies on the phenomenological application of the new NNLO calculations and on fits to the individual data sets are presented. The running of the strong coupling is probed in a single experiment over one order of magnitude in the remormalisation scale and consistency with the QCD expectations is found.

Comments: 5 pages, 4 figures. Contribution to the proceedings of the XXV International Workshop on Deep-Inelastic Scattering and Related Topics (DIS2017), University of Birmingham, UK, 3-7 April 2017