Inclusive jet cross-sections in the Breit frame in neutral current deep inelastic scattering at HERA and determination of alpha(s) - INSPIRE

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Inclusive jet cross-sections in the Breit frame in neutral current deep inelastic scattering at HERA and determination of alpha(s)

ZEUS

Collaboration

Aug, 2002

36 pages

Published in:

Phys.Lett.B 547 (2002) 164-180

e-Print:

hep-ex/0208037 [hep-ex]

DOI:

10.1016/S0370-2693(02)02763-6

Report number:

DESY-02-112

Experiments:

DESY-HERA-ZEUS

View in:

ADS Abstract Service

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Abstract:

Inclusive jet differential cross sections have been measured in neutral current deep inelastic e+p scattering for boson virtualities Q**2>125 GeV**2. The data were taken using the ZEUS detector at HERA and correspond to an integrated luminosity of 38.6 pb-1. Jets were identified in the Breit frame using the longitudinally invariant K_T cluster algorithm. Measurements of differential inclusive jet cross sections are presented as functions of jet transverse energy (E_T,jet), jet pseudorapidity and Q**2, for jets with E_T,jet>8 GeV. Next-to-leading-order QCD calculations agree well with the measurements both at high Q**2 and high E_T,jet. The value of alpha_s(M_Z), determined from an analysis of dsigma/dQ**2 for Q**2>500 GeV**2, is alpha_s(M_Z) = 0.1212 +/- 0.0017 (stat.) +0.0023 / -0.0031 (syst.) +0.0028 / -0.0027 (th.).

Note:

34 pages, 6 figures, 8 tables: submitted to Phys. Lett Report-no: DESY-02-112

positron p: colliding beams
positron p: inclusive reaction
jet: hadroproduction
kinematics: Breit frame
differential cross section: momentum transfer
strong interaction: coupling constant
quantum chromodynamics: perturbation theory
track data analysis: cluster
differential cross section: transverse energy
rapidity dependence

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