Multijet production in neutral current deep inelastic scattering at HERA and determination of

doi:10.1140/epjc/s2005-02347-1

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C (2005) 44: 183-193
https://doi.org/10.1140/epjc/s2005-02347-1

Experimental Physics

Multijet production in neutral current deep inelastic scattering at HERA and determination of $\alpha_s$

The ZEUS Collaboration

Abstract

Multijet production rates in neutral current deep inelastic scattering have been measured in the range of exchanged boson virtualities $10 < Q^{2} < 5000\;{\text{GeV}}^{2}$ . The data were taken at the ep collider HERA with centre-of-mass energy $\sqrt{s} = 318 \hbox{GeV}$ using the ZEUS detector and correspond to an integrated luminosity of $82.2 \hbox{pb}^{-1}$ . Jets were identified in the Breit frame using the k _T cluster algorithm in the longitudinally invariant inclusive mode. Measurements of differential dijet and trijet cross sections are presented as functions of jet transverse energy ( $E_{T,B}^{\rm jet}$ ), pseudorapidity ( $\eta_{\rm LAB}^{\rm jet}$ ) and Q ² with $E^{{{\text{jet}}}}_{{T,B}} > 5\;{\text{GeV}}$ and $- 1 < \eta ^{{{\text{jet}}}}_{{{\text{LAB}}}} < 2.5$ . Next-to-leading-order QCD calculations describe the data well. The value of the strong coupling constant $\alpha_s(M_Z)$ , determined from the ratio of the trijet to dijet cross sections, is $\alpha_s(M_Z) = 0.1179 \pm 0.0013 \rm (stat.)^{ + 0.0028}_{-0.0046} \rm (exp.)^{ + 0.0064}_{-0.0046} \rm (th.)$ .