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2012

Background subtraction and jet quenching on jet reconstruction

Apolinário, Liliana, Armesto, Néstor, Cunqueiro, Letícia

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In order to assess the ability of jet observables to constrain the characteristics of the medium produced in heavy-ion collisions at the LHC, we investigate the influence of background subtraction and jet quenching on jet reconstruction, with focus on the dijet asymmetry as currently studied by ATLAS and CMS.

Using a toy model, we examine the influence of different background subtraction methods on dijet momentum imbalance and azimuthal distributions.
We compare the usual jet-area based background subtraction technique and a variant of the noise-pedestal subtraction method used by CMS.
The purpose of this work is to understand what are the differences between the two techniques, given the same event configuration.

Background subtraction and jet quenching on jet reconstruction · Around

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arXiv:1102.1957
Original
S. Chatrchyan, et al., Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV, Phys.Rev. C84 (2011) 024906 · 1957
Earlier work this paper cites.
O. Kodolova, I. Vardanian, A. Nikitenko, A. Oulianov, The performance of the jet identification and reconstruction in heavy ions collisions with CMS detector, Eur.Phys.J. C50 (2007) 117–123
2007
Earlier work this paper cites.
arXiv:0907.1014
Original
N. Armesto, L. Cunqueiro, C. A. Salgado, Q-PYTHIA: A Medium-modified implementation of final state radiation, Eur.Phys.J. C63 (2009) 679–690 · 2009
Earlier work this paper cites.

Similar

arXiv:1011.6182
Original
G. Aad, et al., Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at sqrt(S(NN))= 2.76 TeV with the ATLAS Detector at the LHC, Phys.Rev.Lett. 105 (2010) 252303 · 2010
Cited alongside, same era.
arXiv:1202.5022
Original
S. Chatrchyan, et al., Jet momentum dependence of jet quenching in PbPb collisions at sqrt(sNN)=2.76 TeV, Phys.Lett. B712 (2012) 176–197 · 2012
Cited alongside, same era.

Then

arXiv:1201.2423
Original
B. Abelev, et al., Measurement of Event Background Fluctuations for Charged Particle Jet Reconstruction in Pb-Pb collisions at · 2012
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arXiv:1111.6097
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M. Cacciari, G. P. Salam, G. Soyez, FastJet user manual, Eur.Phys.J. C72 (2012) 1896 · 2012
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