Faculty of Physics - University of Bucharest

UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2007 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

Jet physics algorithms

Authors:

D. Felea(1), A. Sevcenco(1), C. Besliu(2), C.C. Bordeianu(2)(3), A.G. Gheata(1)(4), M. Gheata(1)(4), I.V. Grossu(2), M. Haiduc(1), D. Hasegan(1), Al. Jipa(2), C. Mitu(1), A.A. Radu(1), M. Rujoiu(1)

Affiliation:

(1)Institute of Space Sciences, Laboratory of Space Research, Bucharest-Magurele, ROMANIA

(2)Faculty of Physics, University of Bucharest, Bucharest-Magurele, ROMANIA

(3)Technologic High School no. 1, Campulung Moldovenesc, Bucharest-Magurele, ROMANIA

(4)CERN, Geneva, SWITZERLAND

E-mail

felea@venus.nipne.ro, adrian.sevcenco@cern.ch

Keywords:

jet physics, jet algorithms, pseudorapidity-azimuth plane, heavy-ion experiments

Abstract:

Jets are defined in QCD (Quantum ChromoDynamics) as cascades of consecutive emissions of partons from an initial hard scattering. The partons produce the observed hadrons due to confinement. Jet-finding techniques for QCD studies are well established for p-p, e-p, and e-e collisions. Due to the presence of a high background from the underlying events these algorithms will not work without modification for the study of jets in heavy-ion collisions. For this purpose a jet finder (HIJA) based on the UA1 cone-type algorithm was previously developed and implemented by other teams of physicists from heavy-ion experiments worldwide. In this algorithm, the jet is defined as a cluster of particles in a cone of fixed radius in the plane defined by the pseudorapidity (eta) and azimuth (phi). However, because in some experiments there are limited possibilities to measure jet properties, we present herewith a variation of this algorithm, the so-called CDF algorithm. We verified this algorithm in a first instance with a toy model which randomly generates jets in phi–eta space and then compared some basic distributions performed in jets analysis with those obtained in proton-antiproton hard interactions at 1.8 TeV at Fermilab by CDF collaboration and also with similar results by using UA1 cone algorithm. These types of algorithms could be used by some LHC-CERN collaborations involved in the study of jet physics, like ALICE (A Large Ion Collider Experiment).