Gavin P. Salam
CERN
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Publication
Featured researches published by Gavin P. Salam.
European Physical Journal C | 2012
Matteo Cacciari; Gavin P. Salam; Gregory Soyez
FastJet is a C++ package that provides a broad range of jet finding and analysis tools. It includes efficient native implementations of all widely used 2→1 sequential recombination jet algorithms for pp and e+e− collisions, as well as access to 3rd party jet algorithms through a plugin mechanism, including all currently used cone algorithms. FastJet also provides means to facilitate the manipulation of jet substructure, including some common boosted heavy-object taggers, as well as tools for estimation of pileup and underlying-event noise levels, determination of jet areas and subtraction or suppression of noise in jets.
Physics Letters B | 2006
Matteo Cacciari; Gavin P. Salam
Abstract At high-energy colliders, jets of hadrons are the observable counterparts of the perturbative concepts of quarks and gluons. Good procedures for identifying jets are central to experimental analyses and comparisons with theory. The k t family of successive recombination jet finders has been widely advocated because of its conceptual simplicity and flexibility and its unique ability to approximately reconstruct the partonic branching sequence in an event. Until now however, it had been believed that for an ensemble of N particles the algorithmic complexity of the k t jet finder scaled as N 3 , a severe issue in the high multiplicity environments of LHC and heavy-ion colliders. We here show that the computationally complex part of k t jet-clustering can be reduced to two-dimensional nearest neighbour location for a dynamic set of points. Borrowing techniques developed for this extensively studied problem in computational geometry, k t jet-finding can then be performed in N ln N time. Code based on these ideas is found to run faster than all other jet finders in current use.
Physics Letters B | 2008
Matteo Cacciari; Gavin P. Salam
One of the major challenges for the LHC will be to extract precise information from hadronic final states in the presence of the large number of additional soft pp collisions, pileup, that occur simultaneously with any hard interaction in high luminosity runs. We propose a novel technique, based on jet areas, that provides jet-by-jet corrections for pileup and underlying-event effects. It is data driven, does not depend on Monte Carlo modelling and can be used with any jet algorithm for which a jet area can be sensibly defined. We illustrate its effectiveness for some key processes and find that it can be applied also in the context of the Tevatron, low-luminosity LHC and LHC heavy-ion collisions.
Physical Review Letters | 2008
J. M. Butterworth; A. R. Davison; Mathieu Rubin; Gavin P. Salam
It is widely considered that, for Higgs boson searches at the CERN Large Hadron Colider, WH and ZH production where the Higgs boson decays to bb are poor search channels due to large backgrounds. We show that at high transverse momenta, employing state-of-the-art jet reconstruction and decomposition techniques, these processes can be recovered as promising search channels for the standard model Higgs boson around 120 GeV in mass.
Physical Review Letters | 2008
J. M. Butterworth; A. R. Davison; Mathieu Rubin; Gavin P. Salam
It is widely considered that, for Higgs boson searches at the CERN Large Hadron Colider,
Journal of High Energy Physics | 2008
Matteo Cacciari; Gavin P. Salam; Gregory Soyez
WH
Physics Letters B | 2001
Mrinal Dasgupta; Gavin P. Salam
and
European Physical Journal C | 2011
A. Abdesselam; Alexander Belyaev; E. Bergeaas Kuutmann; U. Bitenc; G. Brooijmans; J. M. Butterworth; P. A. Bruckman de Renstrom; D. Buarque Franzosi; R. M. Buckingham; B. Chapleau; Mrinal Dasgupta; A. R. Davison; J. Dolen; Stephen D. Ellis; F. Fassi; J. Ferrando; Mads T. Frandsen; J. A. Frost; T. Gadfort; N. Glover; A. Haas; E. Halkiadakis; K. Hamilton; Chris Hays; Christopher Hill; J. Jackson; C. Issever; M. Karagoz; A. Katz; Lukasz Kreczko
ZH
Journal of Physics G | 2012
A. Altheimer; S. Arora; L. Asquith; G. Brooijmans; J. M. Butterworth; M. Campanelli; B. Chapleau; A. E. Cholakian; John Paul Chou; Mrinal Dasgupta; A. R. Davison; J. Dolen; Stephen D. Ellis; R. Essig; J. J. Fan; R. D. Field; Alessandro Fregoso; Jason Gallicchio; Yuri Gershtein; A. Gomes; A. Haas; E. Halkiadakis; V. Halyo; Stefan Hoeche; Anson Hook; Andrew Hornig; P. Huang; Eder Izaguirre; M. Jankowiak; Graham D. Kribs
production where the Higgs boson decays to
Journal of High Energy Physics | 1998
Gavin P. Salam
b\overline{b}