ICHEP 2024

Measurement of jet production in deep inelastic scattering and NNLO determination of the strong coupling at ZEUS

18 Jul 2024, 14:45

15m

North Hall

Parallel session talk 06. Strong Interactions and Hadron Physics Strong interactions and Hadron Physics

Speaker

Florian Lorkowski (University of Zürich)

Description

A new measurement of inclusive-jet cross sections in the Breit frame in neutral current deep inelastic scattering using the ZEUS detector at the HERA collider is presented. The data were taken at a centre-of-mass energy of 318 GeV and correspond to an integrated luminosity of 347 pb-1. Massless jets, reconstructed using the kt-algorithm in the Breit reference frame, have been measured as a function of the squared momentum transfer, and the transverse momentum of the jets in the Breit frame. The measurement has been used in a next-to-next-to-leading-order QCD analysis to perform a simultaneous determination of parton distribution functions of the proton and the strong coupling, resulting in a value of ${\alpha }_s(M_Z^2)=0.1142\pm 0.0017$ (exp/fit)${}_{-0.0007}^{+0.0006}$ (model/param) ${}_{-0.0004(scale)}^{+0.0006}$, whose accuracy is improved compared to similar measurements. In addition, the running of the strong coupling is demonstrated using data obtained at different scales.

Presentation materials

InclusiveJets.pdf