LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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ATLAS and CMS activities
Albert De RoeckCERN
ECFA/DESY meeting St Malo 12-15 April 2002
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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LHC Prospects• New date for first beams/collisions: 1/4/2007• Initial physics run starts in 2007 ~10 fb-1 (2.1033cm-2 s-1)• Depending on the evolution: 200-300 fb-1 in 5-6 years (3.4-10.1033cm-2 s-1 )• Studies ongoing for 1.1035cm-2 s-1 (SLHC)
– Needs changes in machine and detectors ~3000 fb-1 in 3-4 years, i.e. by the end of 2010 or so
• CMS & ATLAS preparing for first beam in 2007– Concentrate on hard & software– Main questions are on trigger/DAQ, using gold plated physics
channels– Exploring of new physics studies not main activity now Discovery potential has been demonstrated for key processes
• Planned/existing physics review studies– ATLAS physics TDR exist since 2000, may be redone in 2005– CMS physics TDR planned for 2005, starting to prepare during
2002
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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ATLAS and CMS Plans• Common LC/LHC studies
– There is interest but not yet much activity (5-10 people/exp for now)
– We need to start with a fewspecific questions/studies– (Agree on luminosities etc.)
• ATLAS: Global fits using masses of measured particles, to scan and constrain the susy space Expect gain due to sleptons on M0
Add branching ratio & cross section measurements Will be initially based on the ‘old’ LHC benchmark points CMS: interest to start such activity/using new benchmark points
• ATLAS & CMS: check on gain of precise measurements of 01 (and
other gaugino’s) for reconstructing squark masses (mass splitting)• CMS: Combining heavy higgs (LHC) with light higgs (LC)
measurement
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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ATLAS and CMS Plans• Benchmark points
– ATLAS: so far study of point E(*) (SPS 2(**)), maybe B (SPS 1a) next
– CMS: point B, C (SPS 3) , E and G for trigger studies and reconstruction points I,L (SPS 4) for heavy Higgs to Tau
( point I could be replaced by SPS1b )– SLHC study: points M, K, H used (no SPS equivalent)– Non-mSUGRA models: take SPS selected points
• CMS: Combined studies of extra dimensions ?
Plan for first results end of June
In the following:• A reminder of LHC reach, relevant for this group• New studies in CMS, e.g. on susy mass reconstruction
(*) BDEGMOPW points (**) Snowmass points & slopes
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Example: LSP from LCImpact of the precise knowledge of the LSP from the LC on the neutralino two and slepton masses
LSP mass LSP mass
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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CMS
Visiting IP5… CMS getting into shape
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Example: The CMS experimento Tracking
o Silicon pixelso Silicon strips
o Calorimeterso PbW04 crystals for Electro-magn.o Scintillator/copper for hadronic part
o 4T solenoido Instrumented iron for muon detection
o Jet Energy scale to 1.0%o EM energy scale to 0.1%o Luminosity to better than 5%
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Expected Event rates
0.001 104
(m=1 TeV) H 0.001 104
(m=0.8 TeV)
Process Events/s Events/year Other machines
W e 15 108 104 LEP / 107 Tev
Z ee 1.5 107 107 LEP
0.8 107 104 Tevatron
105 1012 108 Belle/BaBar
QCD jets 102 109 107 pT > 200 GeV
gg~~
tt
bb
Huge event rates:
The LHC will bea W-factory, aZ-factory, a topfactory, a Higgsfactory etc..
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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SM Higgs search
Production and decay modes:
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Expected Results for the Higgs
- Will discover the Higgs in the range 100 GeV 1 TeV (if exists)- Precision on the measurement of the mass between 0.1-1%
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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H ZZ(*) 4 leptons
• clean signal, mass resolution 1%• precision on muon momentum comes from combining muon chamber with tracker info
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Light Higgs search
If mh < 140 GeV : gg h most promising channel, although BR only 10-3 …
motivation for high resolution ECAL (PbWO4 crystals: 1% at 100 GeV)
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Light Higgs search
Recent: h bb in tth production _
Also results on H
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Hgap gap
b
b -jet
-jet
Exclusive Higgs
A recent development: search for exclusive Higgs production pp p H p
p p
beam
p’
p’
dipoleroman pots
Needs roman pots
Cross section ~ 1 fb Khoze et al.
roman pots
dipole
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Invisible Higgs
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Heavy Higgs
Working hard to cover low tan - high mA region …
COVERED• at large tan , bb A/H and tb H production strongly enhanced!!
• assume Msusy = 1 TeV
• important channels:• A/H • A/H • H • H tb
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Heavy MSSM Higgs search (3)
F. Moortgat
NEW: at low tan , we may exploit the sparticle decay modes:
A, H 20 2
0 4l + ETmiss
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Susy measurements
Atlas physics TDR
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Susy
Mostly complicated decay chains
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Susy
Decay chain example
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Susy discovery LimitsS. Abdoulin
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Susy measurementsAtlas physics TDR: LHC Point 5
m0=100 GeV m1/2=300 GeV tan = 2.1sgn()=+A=300 GeV
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Susy measurementsAtlas physics TDR
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Benchmark points
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Benchmark Points
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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99.610 = LSP
186.01±145.8lR
379.72±211.4lL
186.820549qR
358.830570qL
379.140549.7bR
600.5tR522.5bL
412.5tL643.3g
pb 41.41TOTSUSY
Study of point B (SPS1)M. Chiorboli
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Decay chain
p
p
g~
b~
b
b
01
~
02
~ ~
0A
)( sign
10β tan
100m
250m
0
0
21
bb~
g~ pp
b~02
01~
(15% bL, 10% bR)
(35 % bL, 22% bR)
(0.2 %)
01
~ ~
(60 %)
Event final state:
• 2 high pt isolated leptons OS
• 2 high pt b jets
• missing Et
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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First step: 20 l+l- 1
0
02
~ 01
~
~p
p
g~
b~
b
b
01
~
02
~ ~
GeV 85.32 M
)M)(MM(MM
2
χ
222
χmax01
02
~
~~~~
GeV 1.64 86.00 Mmax
Fit result:
)μM(μ )eM(e -
)μM(e -)μM(e - )μM(μ )eM(e -- Etmiss > 50 GeV
10 fb-1
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Sbottom reconstruction
p
p
g~
b~
b
b
01
~
02
~ ~
Assuming M(10)
known!
p
M
M1p
01
02
~
~
GeV 92 M GeV 75
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Sbottom mass
55.8
GeV 8.1516.4b)~M( 02
Result of fit:
GeV 7.549)b~
M(
GeV 5.522)b~
M(
R
L
Generated masses:
10 fb-1
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Gluino reconstruction
p
p
g~
b~
b
b
01
~
02
~ ~
b)b~
( angle
Etmiss > 150 GeV
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Gluino mass
9.54σ
GeV 7.2631.8bb)χ~M( 02
Result of fit:
GeV 643.3)gM( ~Generated mass:
10 fb-1
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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with 60 fb-1
60 fb-1
0.37σ
GeV 3.50.99b)χ~M(bb)χ~M( 02
02
Result of fit:
)bM(-)gM(~~ )bM(-)gM(~~
GeV 6.93)b~
M(-)g~M(
GeV 8.120)b~
M(-)g~M(
R
L
Generated values:
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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152.510 = LSP
294.51±193.4lR
546.12±299.6lL
294.820780qR
532.430814qL
545.340771.3bR
800.8tR723.0bL
589.4tL919.8g
Point G
pb 6.00TOTSUSY
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Sbottom peak
6.82
GeV 8.743b)~M( 02
Result of fit:
GeV 3.771)b~
M(
GeV 0.723)b~
M(
R
L
Generated masses:
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Guino peak
7.31σ
GeV 1.909bb)χ~M( 02
Result of fit:
GeV 8.199)g~M(
Generated mass:
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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estimation
This needs better understanding of the SM bkg behaviour!
27.9σ
GeV 5.7168.1b)χ~M(bb)χ~M( 02
02
Result of fit:
)bM(-)gM(~~ )bM(-)gM(~~
GeV 5.148)b~
M(-)g~M(
GeV 8.196)b~
M(-)g~M(
R
L
Generated values:
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Conclusions
Point G, with 60 fb-1
• Sbottom and gluino seem to be visible
• estimation of M(l+l-)max
• sbottom reconstruction with Resol. ~ 10 %, but 2 sbottoms not resolved
• gluino reconstruction with Resol. < 10 %
• M(g) - M(b) estimation, independent of M(10), with Err ~ 4 %
Point B, with 10 fb-1
~2~
2~
2~
2~ M)MM)(MM( 0
102
• Maybe we can separate the 2 sbottoms
Point B, with 60 fb-1
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Stop Searches
Stop mass and cross sectionMissing ET and transverse l mass
S/B forSM andSM+SUSY
Channels
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Rare Top Decays
S. Slabospitskydecay production
t ugt cg
1.6 10-3
1.6 10-3
(0.35.) 10-3
(2.122.) 10-3
tutc
2.5 10-5
2.5 10-5
0.4 10-5
3.5 10-5
tuZtcZ
1.6 10-4
1.6 10-4
1.1 10-4
4.8 10-4
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Graviton SearchesTraczyk, Wrochna
KK excitations in the RS model
Search Reach
MG=1000 GeVC=0.01
MG=2000 GeVC=0.01
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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physics
• observation: provided efficient measurement of forward scattered protons, one can study high-energy collisions at the LHC
p p
Highlights:• CM energy W up to/beyond 1 TeV (and under control) • Large photon flux F therefore significant luminosity• Complementary (and clean) physics to pp interactions, eg studies of exclusive production of the Higgs boson, W pairs might be possible opens new field of studying very high
energy physics
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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Two-photon interactions at the LHC
pp
October 2001 K.Piotrzkowski, Erice Workshop
Physics Menu - Highlights
H0
pb (at W=MH=200 GeV)
pb
tt
pb
nb
All ?
W+W-
+ SUSY processes
+ total cross section ….
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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physics
H0
pb (at W=MH=200 GeV)
SUSY: Higgs:
clean signatures: both transversal and longitudinal missing energy !
it cannot be missed!!
LC Workshop April 2002 ATLAS & CMS prospects Albert De Roeck (CERN)
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And more…-Precision measurements MW to 15 MeV, Mtop to 1.5 GeV anomalous gauge couplings, sin2W, rare top decays, B-physics, CP violation studies-MSSM Higgs bosons-Extra dimensions-New heavy gauge bosons-Strong interactions in the W sector-Technicolor-Compositeness up to scales of 40 TeV
LHC detectors must be preparedfor the unknown
MSSM Higgs
W massNew W boson
Top quark mass
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