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_{T}>20 GeV and in the pseudorapidity range 2.5<η<4. These are the first measurements of jet hadronization at these 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, these measurements probe predominantly light-quark jets which are found to be more longitudinally and transversely collimated with respect to the jet axis when compared to the previous gluon dominated measurements. Therefore, these results provide valuable information on differences between quarks and gluons regarding nonperturbative hadronization dynamics.
Highlights
The productiopn ffioffi f charged hadrons within jets recoiling against a Z boson is measured in proton-proton collision data at s 1⁄4 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 pT > 20 GeV and in the pseudorapidity range 2.5 < η < 4. These are the first measurements of jet hadronization at these forward rapidities and 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, these measurements probe predominantly light-quark jets which are found to be more longitudinally and transversely collimated with respect to the jet axis when compared to the previous gluon dominated measurements
Summary
The productiopn ffioffi f charged hadrons within jets recoiling against a Z boson is measured in proton-proton collision data at s 1⁄4 8 TeV recorded by the LHCb experiment. Measuring fragmentation functions with respect to high transverse momentum (pT) jets offers a unique opportunity to study hadron production relative to an object that is correlated to the scattered parton. The unfolded fragmentation distributions are normalized by the total number of Z þ jet events in a given jet pT bin, which is determined separately from the hadron-in-jet unfolding procedure.
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