Supersymmetry at LHC and beyond. ---Ultimate tagets--- Mihoko M. Nojiri YITP, Kyoto University. Why collider ??. Best way to 1. See existence of superpartners 2. Supersymmetric relations 3. Soft mass measurements Understand SUSY breaking mechanism ] Interactions at high scale
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Mihoko M. Nojiri
YITP, Kyoto University
Best way to
1. See existence of superpartners
2. Supersymmetric relations
3. Soft mass measurements
Understand SUSY breaking mechanism
] Interactions at high scale
Impacts on the other physics
B, LFV, Dark matter
Large cross section.
No SM backgrounds
Search up to 2TeV squark or
for 1TeV squarks and gluinos
We should try to extract
ALL physics information
from THIS experiment!
(Not only) famous SPS1a …
Kawagoe, Goto, Nojiri(2004)
visible in wide parameter regions
Proof of smuon F term mixing
Other examples?( m(bb) distribution of gluino->stop top)
Hisano, Kawagoe,MMN 2003
Supergravity and the variants
KK3.Soft mass measurement Collider signature of SUSY “easy” to “hard”
lots of leptons and photons
(Kobayasi, Kawagoe, Ochi,MMN(2003)
Hinchliffe and Paige
gaugino<sfermion(3 body )
Time delay Signals
TOF for charged track
Endpoint analysis(Giacomo’s talk)
Tau and b modes
No good ideas“Moderatecases”
Based on the endpoint analysis, sparticle
masses may be understood very well. The lepton channels are important.
LSP mass [dark matter mass
Slepton mass, neutralino mass[Dark matter density
Nojiri, Polesello, Tovey hep-ph/0312318 (Les Houches)
5 Dim mass space M
A event<-> 4 dim hypersurface
For simplicity Assume we know mass of
Each event corresponds to a curve in the mass plane
Two events is enough to give the masses, and
a distribution of the solution in the previous plot
Kawagoe, MMN, Polesello…
non-universal squark and slepton masses for the 3rd generation.
SPS1a tanb=10 sbottom mass 492GeV
log L(1) + logL(2) + log L(3)+ logL(4)
= log L(~Dc2)
Neutralino momentum also solved.
of the 2nd LSP
Example II heavy higgs reconstruction 4lepton channel
Then 3 body
Tau mode dominate.
All squarks decays into gluino, information loss
Jet selection? B modes?“getting more difficult”
due to top Yukawa RGE
SUSY -> events with many b jets.
btc- ,bbc0and ttc0
Looking for non-b jets from SUSY decay is difficult.
many QCD jets
to W a jj
Branching ratio is biggest for tb final state.
SPS1a: edge with DMtb ~4GeV for 100fb-1
SPS2 :(focus points M=300GeV), distribution may reflect
But cross section is small….
(from the plots in
Hisano, Kawagoe, Nojiri PRD68.035007)
1000 fb-1 but cut is not optimized
easy to study. Want more example. Jet charge
For the wino like second –lightest neutralino
If WEAK SUSY parameters are known
precisely enough, decay pattern of sbottom
may be understood as
the function of q.
Hisano, Kawagoe, Nojiri (for LHC/LC)
O(10%) for GUT scale scalar masses.