Infrared-safe definition of jet flavour

By A. Banfi, G. Salam, G. Zanderighi. 2006

184 citations recorded by the source corpus.

It is common, in both theoretical and experimental studies, to separately discuss quark and gluon jets. However, even at parton level, widely-used jet algorithms fail to provide an infrared-safe way of making this distinction. We examine the origin of the problem and propose a solution in terms of a new “flavour-kt” algorithm. As well as being of conceptual interest this can be a powerful tool when combining fixed-order calculations with multi-jet resummations and parton showers. It also has applications to studies of heavy-quark jets.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/2fdeedc5460f7737ab358057798c68fb3a395fa1

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In Nuclear and High Energy Physics

Citations in the corpus

QCD matrix elements and truncated showers (2009, background): “Extensions of those algorithms to include jet flavour have been presented in [42].”
Phenomenology of event shapes at hadron colliders (2010, methodology): “At perturbative level it is also possible to unambiguously attribute a partonic subprocess to the event, for example qq → qq (doing so requires a flavour infrared and collinear safe procedure, as in [72], but the result is”
Non-perturbative QCD effects in jets at hadron colliders (2007, background): “In order to estimate the effects of the nonperturbative shift we have computed here, let us begin by assuming that we have at our disposal a jet definition such that quark and gluon jets can be distinguished at parton level (an example of such a definition is given in [51]), and such that it can be ”
Energy correlation functions for jet substructure (2013, methodology): “There exist algorithms designed specifically to guarantee a safe jet flavor to all orders, the “flavor-kT ” algorithms [76].”
Towards jetography (2009, methodology): “If one is interested in maintaining a meaningful flavour for jets (for example in purely partonic studies, or when discussing heavy-flavour jets), then one may use a distance measure that takes into account the different divergences for quark and gluon branching, as in [81, 82].”
Gaining (mutual) information about quark/gluon discrimination (2014, background): “[41] is one option to define the truth flavor of a jet, we would prefer a definition for which the jet constituents are the same as for traditional flavor-less jet algorithms.”
Jet substructure at the Large Hadron Collider (2018, background): “Many labeling conventions exist, ranging in simplicity and modeldependence from matching to out-going matrix element partons to parsing an entire jet clustering history [87, 88]; however, no treatment escapes the problem that the nogluon-jet rejection 0 0.”
Giant QCD K-factors beyond NLO (2010, background): “As discussed in [ 33 ] such a modification alone is not sufficient to systematically guarantee sensible treatment of flavour in jet clustering.”