Infrared-safe definition of jet flavour |
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| Authors: | A. Banfi G.P. Salam G. Zanderighi |
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| Affiliation: | (1) Centre for Mathematical Sciences, DAMTP, Cambridge, CB3 0WA, UK;(2) Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK;(3) University of Milano–Bicocca and INFN Sezione di Milano, Milano, Italy;(4) LPTHE: Université Pierre et Marie Curie – Paris 6; Université Denis Diderot – Paris 7; CNRS, 75252 Paris, France;(5) Theory Group, Fermilab, P.O. Box 500, Batavia, IL, USA;(6) Theory Division, Physics Department, CERN, 1211 Geneva 23, Switzerland |
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| Abstract: | 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. |
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