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Dan Hertz A Examination Physics Department Cornell University 5/4/05. MSSM, SUSY and discovery potential at the LHC. If you knew Susy like I know Susy, oh oh oh what a girl. Why do we like SUSY? Because it's pretty... and SUPER Higgs quadratic divergence problem solved Hierarchy Problem

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dan hertz a examination physics department cornell university 5 4 05
Dan Hertz

A Examination

Physics Department

Cornell University

5/4/05

MSSM, SUSY and discovery potential at the LHC
if you knew susy like i know susy oh oh oh what a girl
If you knew Susy like I know Susy, oh oh oh what a girl...
  • Why do we like SUSY?
    • Because it's pretty...
    • and SUPER
    • Higgs quadratic divergence problem solved
    • Hierarchy Problem
    • Gauge unification
    • It gives us lots of stuff to look for
susy lagrangian
SUSY Lagrangian

Lgauge + Lint: Gauge interactions

Lchiral: Dimensionless, non-gauge

SUSY Terms (soft)

when susy breaks
Solution?

universal soft masses

universal gaugino masses

(scalar)3 like Yukawa

Keep it real

When SUSY breaks...
  • ~100 new parameters!
  • Problems:
    • FCNC
    • CP
    • meg
    • Kaon mixing
msugra
The Bad

Reality check?

Reasonable assumptions?

A victim of its own popularity?

mSUGRA

The Good:

  • Simple:
  • 4 parameters + 1:
  • m0 , m1/2, A0, B0 (m)
    • m0, m1/2, A0, tanb, sgn(m)
  • Dark Matter
sample msugra spectrum
Sample mSUGRA spectrum

m0 = 60 GeV, m1/2 = 250 GeV, A0 = 0, tanb = 10, m > 0

what do we look for
Exclusive

2l + E_miss (+ jets)

2 l, no jets

3l, no jets

Cutoff in mll

What do we look for?

Inclusive

  • as broad as possible
  • Try to see something
    • (jets, E_miss)
    • leptons, jets, E_miss
    • anything
what do we see
What do we see?

cutoff in mll

Reach

great we ve got a signal now what
Great, we've got a signal! Now what...
  • Celebrate
  • Declare victory
  • Check all our models
    • points in parameter space
  • Probe how mSUGRA (SUSY) works
  • But...
what if it s not right the negative approach
What if it's not right?The negative approach
  • Look for ways to disprove SUSY
    • correlated signals
      • 2l SS, no jets
      • 2l OS, no jets
    • 104 mSUGRA points
      • bounded region in space of correlated signals