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Measurement of charged hadron production in $Z$-tagged jets in proton-proton collisions at $\sqrt{s}=8$ TeV

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Abstract

The production of charged hadrons within jets recoiling against a $Z$ boson is measured in proton-proton collision data at $\sqrt{s}=8$ TeV recorded by the LHCb experiment. The charged-hadron structure of the jet is studied longitudinally and transverse to the jet axis for jets with transverse momentum $p_{\rm T}>20$ GeV and in the pseudorapidity range $2.5<\eta<4$. These are the first measurements of jet hadronization at forward rapidities and also the first where the jet is produced in association with a $Z$ boson. In contrast to previous hadronization measurements at the Large Hadron Collider, which are dominated by gluon jets, this measurement probes predominantly light-quark jets. Therefore, these results can provide valuable information on differences between quarks and gluons regarding nonperturbative hadronization dynamics.

Figures and captions

Unfolded distributions of the longitudinal momentum fraction of the hadron with respect to the jet in three bins of jet $ p_{\mathrm{T}}$ . The bars (boxes) show the statistical (systematic) uncertainties.

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Unfolded distributions of the transverse momentum of charged hadrons with respect to the jet axis in three bins of jet $ p_{\mathrm{T}}$ . The bars (boxes) show the statistical (systematic) uncertainties.

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Unfolded radial profile distributions of hadrons with respect to the jet axis in three bins of jet $ p_{\mathrm{T}}$ . The bars (boxes) show the statistical (systematic) uncertainties.

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The $z$ distribution for jets with $30< p_{\mathrm{T}} <50\text{ Ge V} $ compared to Pythia simulation predictions. The bars (boxes) show the statistical (systematic) uncertainties.

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Supplementary Material [file]

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Created on 17 August 2019.Citation count from INSPIRE on 20 August 2019.