Abstract
We study the production of an electroweak boson in association with jets, in processes where the jet with the highest transverse momentum is identified as quark-initiated. The quark/gluon tagging procedure is realised by a cut on a jet angularity and it is therefore theoretically well-defined and exhibits infrared and collinear safety. In this context, exploiting resummed perturbation theory, we are able to provide theoretical predictions for transverse momentum distributions at a well-defined and, in principle, systematically improvable accuracy. In particular, tagging the leading jet as quark-initiated allows us to enhance the initial-state gluon contribution. Thus these novel transverse momentum distributions are potentially interesting observables to probe the gluonic degrees of freedom of the colliding protons.
Highlights
This work is part of an incipient effort to find innovative ways of applying jet substructure techniques to the broader LHC physics program and to provide the necessary tools so that this cross-pollination can bear its fruits
We study the production of an electroweak boson in association with jets, in processes where the jet with the highest transverse momentum is identified as quark-initiated
We start by considering the channel fractions fi j that measure, to a given order in perturbation theory, the contribution to the Z transverse momentum distributions from the subprocess initiated by partons i and j, which, for brevity, we indicate as σiaj, where a could be the Z boson or the leading jet J : fiaj σgag, a = Z, J, (1)
Summary
This work is part of an incipient effort to find innovative ways of applying jet substructure techniques to the broader LHC physics program and to provide the necessary tools so that this cross-pollination can bear its fruits In this context, measurements of the internal structure of highly energetic jets produced in association with a boosted electroweak boson offer an ideal playground for such studies, because the leptonic decay of the Z boson offers a valuable trigger. If the leading jet is tagged as quarkinitiated, at leading order, the subprocess that features a quark and gluon in the initial state is enhanced This procedure could potentially provide us with a new handle on the determination of the gluon parton distribution function (PDF). The results presented here account for the resummation of the tagging parameter at the next-to-leading logarithmic (NLL) accuracy, matched to fixed order predictions at O αs with respect to the Born contribution, denoted as next-to-leading order (NLO).
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