Sparticle Sparticle reconstruction in reconstruction in final states with di- final states with di- leptons leptons M. Chiorboli, M. Chiorboli, M. Galanti M. Galanti , A. , A. Tricomi Tricomi University and INFN, Catania University and INFN, Catania Credits: Luc Pape Credits: Luc Pape
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Sparticle reconstruction in final states with di-leptons
Sparticle reconstruction in final states with di-leptons. M. Chiorboli, M. Galanti , A. Tricomi University and INFN, Catania Credits: Luc Pape. Outline. Aim: measurement of sparticle masses from kinematical end-point analyses in events containing c 2 0 → c 1 0 ll (l=e, m ) - PowerPoint PPT Presentation
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Sparticle Sparticle reconstruction in final reconstruction in final states with di-leptonsstates with di-leptons
M. Chiorboli, M. Chiorboli, M. GalantiM. Galanti, A. Tricomi, A. TricomiUniversity and INFN, CataniaUniversity and INFN, Catania
Credits: Luc PapeCredits: Luc Pape
Mario GalantiMario GalantiUniversity & INFN - University & INFN - CataniaCatania
Aim: measurement of sparticle Aim: measurement of sparticle masses from kinematical end-masses from kinematical end-point analyses in events point analyses in events containing containing 22
00→→1100ll (l=e,ll (l=e,))
Feasibility study:Feasibility study:– first step: parton levelfirst step: parton level– preliminary attempts with FAMOSpreliminary attempts with FAMOS
Mario GalantiMario GalantiUniversity & INFN - University & INFN - CataniaCatania
In sequential decays, all the sparticle masses involved can be extracted from the measurement of edges and thresholds in the effective mass distributions
Maxima and minima of effective masses correspond to collinear configurations
Only squark chains considered at this stage
Squark coming from gluino decays or directly produced
Mario GalantiMario GalantiUniversity & INFN - University & INFN - CataniaCatania
(llq) edges(llq) edges Two upper end points for high and low m(ll)Two upper end points for high and low m(ll) Lower threshold depending on M(ll) Lower threshold depending on M(ll)
(parametrization known)(parametrization known)
2
20
2
21max, 11
XQ
XQllq M
M
M
MMM
2
20
2
22max, 11
RQ
RQllq M
M
M
MMM
2
20
2
23max,
)(
)(11
RQ
X
X
RQllq MM
MM
M
MMM
M(llq)max,1
M(llq)max,2 or M(llq)max,3
m(l
l)
m(llq)
Mario GalantiMario GalantiUniversity & INFN - University & INFN - CataniaCatania
Identification of l1 Identification of l1 and l2 mandatory and l2 mandatory to observe the true to observe the true maxima in llq maxima in llq distributiondistribution
Distinction Distinction between the two between the two leptons: under leptons: under investigationinvestigation
M(llq)
M(l
1q
)
Mario GalantiMario GalantiUniversity & INFN - University & INFN - CataniaCatania
10k events produced @ LM110k events produced @ LM1– FAMOS_0_9_0_pre4, CMKIN _3_1_0FAMOS_0_9_0_pre4, CMKIN _3_1_0– Only Only ~q ~~q ~
process, process, forced decaysforced decays Created rootfiles with information on:Created rootfiles with information on:
– muons:muons: FastMuonLvl3FinderFastMuonLvl3Finder – jets:jets: FamosPersistentJetFinderFamosPersistentJetFinder– missing Et:missing Et: FamosMETfromCaloTowerFamosMETfromCaloTower– No electrons yetNo electrons yet– No mu isolation yetNo mu isolation yet– No b-taggingNo b-tagging
Mario GalantiMario GalantiUniversity & INFN - University & INFN - CataniaCatania