Measurement of jet shapes in high-$Q^2$ deep inelastic scattering at HERA

The ZEUS Collaboration: J. Breitweg - et al.

doi:doi:10.1007/s100529901107

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C 8, 367-380
DOI 10.1007/s100529901107

Measurement of jet shapes in high-Q² deep inelastic scattering at HERA

The ZEUS Collaboration

J. Breitweg - et al.

Argonne National Laboratory, Argonne, IL, USA

Received: 2 April 1998 / Published online: 15 April 1999

Abstract
The shapes of jets with transverse energies, $E_{\rm T}^{\rm jet}$ , up to 45GeV produced in neutral- and charged-current deep inelastic e⁺p scattering (DIS) at Q² > 100GeV² have been measured with the ZEUS detector at HERA. Jets are identified using a cone algorithm in the $\eta-\varphi$ plane with a cone radius of one unit. The jets become narrower as $E^{\rm jet}_{\rm T}$ increases. The jet shapes in neutral- and charged-current DIS are found to be very similar. The jets in neutral-current DIS are narrower than those in resolved processes in photoproduction and closer to those in direct-photon processes for the same ranges in $E_{\rm T}^{\rm jet}$ and jet pseudorapidity. The jet shapes in DIS are observed to be similar to those in e⁺e^- interactions and narrower than those in $\bar{p}p$ collisions for comparable $E_{\rm T}^{\rm jet}$ . Since the jets in e⁺e^- interactions and e⁺p DIS are predominantly quark initiated in both cases, the similarity in the jet shapes indicates that the pattern of QCD radiation within a quark jet is to a large extent independent of the hard scattering process in these reactions.