Inclusive-jet cross sections in NC DIS at HERA and a comparison of the kT, anti-kT and SIScone jet algorithms

TL;DR

This paper presents the first measurements of inclusive-jet cross sections in neutral current deep inelastic scattering at HERA using anti-kT and SIScone algorithms, comparing their performance and extracting the strong coupling constant.

Contribution

It introduces the use of anti-kT and SIScone algorithms in NC DIS jet measurements and compares their performance to the kT algorithm, providing new insights into jet algorithm suitability.

Findings

Jet cross sections are well described by NLO QCD calculations.

Ratios of cross sections using different algorithms match theoretical predictions.

Extracted alpha_s(Mz) values are consistent with previous measurements.

Abstract

For the first time, differential inclusive-jet cross sections have been measured in neutral current deep inelastic ep scattering using the anti-kT and SIScone algorithms. The measurements were made for boson virtualities Q^2 > 125 GeV^2 with the ZEUS detector at HERA using an integrated luminosity of 82 pb^-1 and the jets were identified in the Breit frame. The performance and suitability of the jet algorithms for their use in hadron-like reactions were investigated by comparing the measurements to those performed with the kT algorithm. Next-to-leading-order QCD calculations give a good description of the measurements. Measurements of the ratios of cross sections using different jet algorithms are also presented; the measured ratios are well described by calculations including up to O(alphas^3) terms. Values of alphas(Mz) were extracted from the data; the results are compatible with and have similar precision to the value extracted from the kT analysis.