Jet production in charged current deep inelastic e+p scattering at HERA

TL;DR

This paper reports on jet production rates and substructure in charged current deep inelastic e+p scattering at HERA, comparing measurements with QCD predictions and determining the strong coupling constant.

Contribution

It provides new measurements of jet cross sections and subjet multiplicities in charged current DIS, and extracts the value of alpha_s(M_Z) from these data.

Findings

Jet cross sections are measured for specific energy and pseudorapidity ranges.

The mean subjet multiplicity is consistent with neutral current DIS results.

The strong coupling constant alpha_s(M_Z) is determined to be approximately 0.1202.

Abstract

The production rates and substructure of jets have been studied in charged current deep inelastic e+p scattering for Q**2>200 GeV**2 with the ZEUS detector at HERA using an integrated luminosity of 110.5 pb**-1. Inclusive jet cross sections are presented for jets with transverse energies E_T(jet) > 14 GeV and pseudorapidities in the range -1 < eta(jet) < 2. Dijet cross sections are presented for events with a jet having E_T(jet) > 14 GeV and a second jet having E_T(jet) > 5 GeV. Measurements of the mean subjet multiplicity, <n_sbj>, of the inclusive jet sample are presented. Predictions based on parton-shower Monte Carlo models and next-to-leading-order QCD calculations a re compared to the measurements. The value of alphas(M_Z), determined from <n_sbj> at y_cut=0.01 for jets with 25<E_T(jet)<119 GeV, is alphas(M_Z) = 0.1202 +-0.0052 (stat.) +0.0060-0.0019 (syst.) +0.0065-0.0053 (th.). The mean subjet multiplicity as a function of Q**2 is found to be consistent with that measured in NC DIS.