Identification and rejection of fake reconstructed jets from a fluctuating heavy ion background in ATLASReportar como inadecuado




Identification and rejection of fake reconstructed jets from a fluctuating heavy ion background in ATLAS - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

The European Physical Journal C

, Volume 62, Issue 1, pp 191–196

First Online: 10 March 2009Received: 07 October 2008

Abstract

Full jet reconstruction in relativistic heavy ion collisions provides new and unique insights to the physics of parton energy loss. Because of the large underlying event multiplicity in A+A collisions, random and correlated fluctuations in the background can result in the reconstruction of fake jets. These fake jets must be identified and rejected to obtain the purest jet sample possible. A large but reducible fake rate of jets reconstructed using an iterative cone algorithm on HIJING events is observed. The absolute rate of fake jets exceeds the binary-scaled p+p jet rate below 50 GeV and is not negligible until 100 GeV. The variable ΣjT, the sum of the jet constituent’s ET perpendicular to the jet axis, is introduced to identify and reject fake jets at by a factor of 100 making it negligible. This variable is shown to not strongly depend on jet energy profiles modified by energy loss. By studying azimuthal correlations of reconstructed di-jets, the fake jet rate can be evaluated in data.

All results presented use modified versions of ATLAS software and should be considered -ATLAS preliminary-.

Download to read the full article text



Autor: on behalf of the ATLAS Collaboration - N. Grau

Fuente: https://link.springer.com/



DESCARGAR PDF




Documentos relacionados