1. 1-lepton + Multijets Analysis bRPV interpretation
2011 proton-proton collision data
ATLAS open presentation last Friday.
Will soon be public
Conf note: ATLAS-COM-CONF
Supp note: ATL-COM-PHYS
≥ 1-lepton + (3-5) jets: ATLAS-CONF
Paper:
Vasiliki Mitsou
Emma Torró Pastor
Elena Romero Adam
(IFIC)
September 10, 2012

2. Analysis Overview Signal Region: (h1lh7jt)
Exactly one isolated electron or muon
+ ≥ 7 jets + missing transverse energy
Observed number of events in the electron and muon signal regions, and the background expectations from the fit. The inputs to the fit are also shown
* electron (muon) *
Muon: p0 = sigma = 2.083
Electron: p0 = sigma = 1.12
Combined: p0 = sigma = 2.077

3. Exclusion Plots This year analysis Extended grid 1-lepton + ≥ 7 jets
Last year analysis
1 muon + 3 or 4 jets
extended grid: luminosity, muon + electron, new SR multijets, enhanced fit (shape fit)

4. BACKUP

5. Exclusion Plots
David Côte’s talk at SUSY Working Group Approval Meeting on the 27th of July 2012

6. SUSY Model

10. Supersymmetry SUSY = global symmetry between fermions & bosons
all SM particles have SUSY-partners with spin difference of ±1/2
Theoretical motivation
Higgs mass stabilisation against loop corrections (fine-tuning problem)
unification of gauge couplings at single scale
dark matter candidate: Lightest supersymmetric particle (LSP)

11. R-Parity
bilinear terms

12. SUSY Model mSUGRA + bRPV Choice of mSUGRA parameters:
tan β = 10
A0 = 0 GeV
sign( μ ) = 1
m0 = 100 – 800 GeV
m1/2 = 200 – 600 GeV
bRPV: parameters chosen to be consistent with constraints from neutrino experiments
Δmatm2, Δmsol2, tan2θatm, tan2θsol, …

13. Bilinear RPV: theoretical motivation
RPV through bilinear terms
six bRPV parameters: ϵi, Bi ⇔ ϵi, Λi (Λi = ϵivd + μvi)
Bilinear RPV introduces new aspects
EW symmetry is broken by Higgs and sneutrino vev’s
neutrinos mix with neutralinos ➞ 7 × 7 mixing matrix
a “low-scale” seesaw mechanism renders neutrinos massive
tree level → atmospheric scale
1-loop → solar scale
Valle, Hirsch, Porod, Diaz et al.
Bilinear R-parity violating terms in the superpotential introduce neutrino masses in an intrinsically supersymmetric way
HEP2012
V.A. Mitsou