Search for Excited Electrons
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Search for Excited Electrons • In compositeness models, quarks and leptons are assumed to be bound states of “preons” made of three fermions or a fermion and a boson. Predict a large spectrum of excited states • Study singly produced e* via Contact Interaction (CI) and decaying via Gauge Mediated (GM) decay. • Three GM decay modes: • ν + W 2 j + or l + • e + γ : most promising channel (high branching ratio and low SM background) • e + Z e +2 j or e + 2 l • Final state : 2e+ γ • Model with 2 parameters : excited electron mass m e* and compositeness scale Λ. Ahmed ABDELALIM, Alain BLONDEL, Bertrand MA miss T E Single e* prod. Cross section miss T E e e* q q e e* q q
description
Search for Excited Electrons. Ahmed ABDELALIM, Alain BLONDEL, Bertrand MARTIN. In compositeness models, quarks and leptons are assumed to be bound states of “ preons ” made of three fermions or a fermion and a boson. Predict a large spectrum of excited states - PowerPoint PPT Presentation
Transcript of Search for Excited Electrons
Search for Excited Electrons
• In compositeness models, quarks and leptons are assumed to be bound states of “preons” made of three fermions or a fermion and a boson. Predict a large spectrum of excited states
• Study singly produced e* via Contact Interaction (CI) and decaying via Gauge Mediated (GM) decay.
• Three GM decay modes: • ν + W 2 j + or l +• e + γ : most promising channel
(high branching ratio and low SM background)• e + Z e +2 j or e + 2 l
• Final state : 2e+ γ• Model with 2 parameters : excited electron mass me*
and compositeness scale Λ.
Ahmed ABDELALIM, Alain BLONDEL, Bertrand MARTIN
missTE
Single e* prod.Cross section
missTE
e e*
q q
e e*
q q
• Previous Limits :– LEP, HERA : me* > 300 GeV
– CDF : me* > 879 GeV for Λ = me*
– DØ : me* > 796 GeV for Λ = me*
• Backgrounds :– Physics : Z+ γ– Jets faking e/γ: Z+Jet, W+ γ, W+Jet, diboson, QCD ....(will
be included later)
Excl. 95% CL
Reco. meeγ Reco. meγ
me*=1TeV, Λ= 5TeV
1200pbLdt 1200pbLdt
