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Study of second lightest neutralino spin measurement with ATLAS detector at LHC

One of the goals of the ATLAS experiment at the CERN Large Hadron Collider is to search for evidence of Supersymmetry (SUSY) signals. If SUSY would be discovered, it will be fundamental to measure the spin of the new particles in order to prove that they are indeed supersymmetric partners. Left-hand...

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Detalles Bibliográficos
Autores principales: Biglietti, M, Borjanovic, I, Carlino, G, Conventi, F, Gorini, E, Migliaccio, A, Musto, E, Primavera, M, Spagnolo, S, Ventura, A
Lenguaje:eng
Publicado: 2006
Materias:
Acceso en línea:http://cds.cern.ch/record/1007184
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author Biglietti, M
Borjanovic, I
Carlino, G
Conventi, F
Gorini, E
Migliaccio, A
Musto, E
Primavera, M
Spagnolo, S
Ventura, A
author_facet Biglietti, M
Borjanovic, I
Carlino, G
Conventi, F
Gorini, E
Migliaccio, A
Musto, E
Primavera, M
Spagnolo, S
Ventura, A
author_sort Biglietti, M
collection CERN
description One of the goals of the ATLAS experiment at the CERN Large Hadron Collider is to search for evidence of Supersymmetry (SUSY) signals. If SUSY would be discovered, it will be fundamental to measure the spin of the new particles in order to prove that they are indeed supersymmetric partners. Left-handed squark cascade decay to second lightest neutralino which further decays to slepton can represent a good opportunity for SUSY particles' spin measurement. Assuming the neutralino spin to be 1/2, the invariant mass distributions of some detectable final products of the reactions have to be charge asymmetric. In the present work the detectability of this charge asymmetry is analysed in the stau-coannihilation region and in the bulk region of the minimal Supergravity parameter space allowed by the latest experimental constraints. The criteria used to isolate the decay chain of interest and to reject the background, coming from both Standard Model and different SUSY decay channels, are described as obtained by suitable optimizations on Monte Carlo samples produced with the ATLAS fast simulation. The estimates of the residual contributions to background and of the applied cut efficiencies are presented. Results on charge asymmetry are then shown and discussed.
id cern-1007184
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2006
record_format invenio
spelling cern-10071842021-04-18T19:39:59Zhttp://cds.cern.ch/record/1007184engBiglietti, MBorjanovic, ICarlino, GConventi, FGorini, EMigliaccio, AMusto, EPrimavera, MSpagnolo, SVentura, AStudy of second lightest neutralino spin measurement with ATLAS detector at LHCDetectors and Experimental TechniquesOne of the goals of the ATLAS experiment at the CERN Large Hadron Collider is to search for evidence of Supersymmetry (SUSY) signals. If SUSY would be discovered, it will be fundamental to measure the spin of the new particles in order to prove that they are indeed supersymmetric partners. Left-handed squark cascade decay to second lightest neutralino which further decays to slepton can represent a good opportunity for SUSY particles' spin measurement. Assuming the neutralino spin to be 1/2, the invariant mass distributions of some detectable final products of the reactions have to be charge asymmetric. In the present work the detectability of this charge asymmetry is analysed in the stau-coannihilation region and in the bulk region of the minimal Supergravity parameter space allowed by the latest experimental constraints. The criteria used to isolate the decay chain of interest and to reject the background, coming from both Standard Model and different SUSY decay channels, are described as obtained by suitable optimizations on Monte Carlo samples produced with the ATLAS fast simulation. The estimates of the residual contributions to background and of the applied cut efficiencies are presented. Results on charge asymmetry are then shown and discussed.ATL-PHYS-PUB-2007-004CERN-ATL-PHYS-PUB-2007-004ATL-COM-PHYS-2006-095oai:cds.cern.ch:10071842006-12-22
spellingShingle Detectors and Experimental Techniques
Biglietti, M
Borjanovic, I
Carlino, G
Conventi, F
Gorini, E
Migliaccio, A
Musto, E
Primavera, M
Spagnolo, S
Ventura, A
Study of second lightest neutralino spin measurement with ATLAS detector at LHC
title Study of second lightest neutralino spin measurement with ATLAS detector at LHC
title_full Study of second lightest neutralino spin measurement with ATLAS detector at LHC
title_fullStr Study of second lightest neutralino spin measurement with ATLAS detector at LHC
title_full_unstemmed Study of second lightest neutralino spin measurement with ATLAS detector at LHC
title_short Study of second lightest neutralino spin measurement with ATLAS detector at LHC
title_sort study of second lightest neutralino spin measurement with atlas detector at lhc
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/1007184
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