Wolfgang Hofle CERN AB/RF/FB Joel R. Thompson (LBNL/CERN) R. de Maria (BNL/CERN)
New Physics at the LHC/ILC B-L Workshop, LBNL September, 2007 Sally Dawson (BNL)
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Transcript of New Physics at the LHC/ILC B-L Workshop, LBNL September, 2007 Sally Dawson (BNL)
![Page 1: New Physics at the LHC/ILC B-L Workshop, LBNL September, 2007 Sally Dawson (BNL)](https://reader038.fdocuments.us/reader038/viewer/2022110400/56649dcf5503460f94ac3edb/html5/thumbnails/1.jpg)
New Physics at the LHC/ILC
B-L Workshop, LBNL
September, 2007
Sally Dawson (BNL)
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Three Examples:
• The Higgs
• Supersymmetry
• New Z’ boson
What do we know from the Tevatron?
What will the LHC tell us?
What needs the ILC?
I hope we find something we haven’t thought of yet!
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• Will be data driven
Particle Physics in tne LHC/ILC Era
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Bat 40
Eagerly anticipating LHC data……
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From the Tevatron to the LHC
Large increase in cross sections as
we go from the Tevatron to the LHC
1 TeV squark/gluino pair production
High pT QCD Jets
Drell-Yan production of W’s & Z’s
Gluon fusion of 150 GeV Higgs
F. Gianotti, Phys. Rep. 403, 379 (2004)
s (TeV)
(n
b)
LHCTevatron
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O(100 pb-1) per experiment by early 2009
Early Physics at the LHC
Channel Events/100 pb-1
at LHC
Previous # of Events
W→ 105 104 LEP, 106 Tevatron
Z →e+e- 105 107 LEP, 105 Tevatron
104 104 Tevatron
QCD jets, pT>1 TeV >103
1 TeV Gluino pairs 50
Early data used to calibrate detectors
Z→e+e-, +- (Tracker, ECAL, Muon chambers calibration)
tt →WbWb (Jet scale from W →jj, b-tag efficiency, etc)
Rediscover SM physics at s=14 TeV: W, Z, top, QCD
XbbWWtt
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Precision measurements limit Higgs Mass
• LEP EWWG (July, 2007):
– Mt=170.9 1.8 GeV
– Mh=76+36-24 GeV
– Mh < 144 GeV (one-sided 95% cl)
– Mh < 182 GeV (Precision measurements plus direct search limit)
Best fit in region excluded from direct searches
2007
Mh (GeV)
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SM Higgs Searches at Tevatron
Tevatron Observed
Tevatron Expected
LP07
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W, Top, and the Higgs
Will indirect measurements agree with what the LHC sees?
Run II2009
Includes K factors
Mh (GeV)Mt (GeV)
MW(G
eV)
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SM Higgs Production at the LHC
Dawson, Jackson, Reina, Wackeroth, hep-ph/0508293
Mh (GeV)
Rates wellunderstood
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Higgs discovery potential at the LHC
ATLAS+CMS
Ne
ede
d
Ldt
per
exp
erim
ent
(fb
-1)
1 fb-1: 95% C.L. exclusion5 fb-1: 5 discovery
Mh(GeV)
J. Blaising et al, Eur. Strategy Workshop
Assumes well understood
detector
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Is Mass Due to a Higgs Boson?
LHC measures couplings to Higgs bosons to 10-20%
ILC measures couplings to Higgs bosons at few % level
Duhrssen, hep-ph/0406323
Mh(GeV)Mh(GeV)
BR
(H→
X)),(
),(2
2
Xhg
Xhg
Self coupling of Higgs needed to reconstruct Higgs potential. Extremely challenging at both LHC and ILC
Battaglia & Desch, hep-ph/0101165
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Threshold behavior measures spin at ILC
ILC with 20 fb-1 /point
Measuring the spin of the Higgs
Spin is hard at the LHC!
LHC with 300 fb-1
Choi, Miller, Muhlleitner, Zerwas, hep-ph/0210077
M(Z*) (GeV)
Nu
mb
er
of E
ven
ts
s (GeV)
(fb)
J. Aguilar-Saavedra, hep-ph/0106315
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MSSM Higgs Searches at the Tevatron
LP07
Mhmax,> 0
h, H, A (D0)
Dominant SUSY Higgs production mechanism is gb→b for tan > 7
MA (GeV)
MA (GeV)ta
n tan
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MSSM Higgs at the LHC
Even with a lot (!) of data there are regions where the LHC can’t get all the MSSM Higgs
MA (GeV)MA (GeV)
tan
tan
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Squarks & Gluinos at the Tevatron
LP07
Mgluino > 290 GeV
If Mgluino=Msquark,
M > 380 GeV
Strongly interacting SUSY particles have large rates at the Tevatron and LHC
Mgluino (GeV)
Msq
uark (
GeV
)
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mSUGRA at the Tevatron
LP07
Tevatron probes just the tip of the iceberg
mSUGRA is useful framework for study
M0(GeV)M0(GeV)
M1/
2 (G
eV)
M1/
2 (G
eV)
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SUSY at the LHC(
pb)
M (GeV)Tevatron
Huge rates; well defined signaturesM(gluino, squark) 1 TeV gives 100 events with 100 pb-1 at LHC
Immediate improvements over Tevatron limits
M0(GeV)M
1/2
(GeV
)
2009
Tata
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300 fb-1
at LHC
If LSP is dark matter, and SUSY is mSUGRA…..LHC and ILC will see SUSY
Region allowed in mSUGRA by WMAP with LSP as dark matter
M0(GeV)
M1/
2 (G
eV)
tan =30, A0=0, >0
100 fb-1 at ILC
Baer, Belyaev, Krupovnickas, Tata, hep-ph/0311351
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Z’ at the Tevatron
MZ’ (GeV)
Z’ →e+ e-
Many differenttypes of Z’s are possible
B
R (
pb)
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New Z’ boson at the LHC
Small SM background Narrow peak above background
Z’ e+e- with SM-couplings (SSM)
Z’ Mass
(TeV)
Events
with 1 fb-1
Discovery Luminosity
(10 events)1.0 160 70 pb-1
1.5 30 300 pb-1
2.0 7 1.5 fb-1
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ILC Needed for Z’ Coupling Measurement
Which Z’ is it? Kaluza Klein state? Copy of standard model? Extended gauge symmetry?
ILC cleanly distinguishes between models
L=1 ab-1, P-=.8, P+=.6, P=.5%, sys (lep)=.2%
S. Riemann
Z’ couplings to leptons
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Conclusions
Discove
ries c
oming
soon