Cornell Seminar, Oct. 4, 20041 Physics at CMS Status of CMS and US CMS Dan Green Fermilab October 6, 2004

Cornell Seminar, Oct. 4, 2004 1

Physics at CMSPhysics at CMSPhysics at CMSPhysics at CMS

Status of CMS

and

US CMS

Dan Green

Fermilab

October 6, 2004


OutlineOutlineOutlineOutline

• LHC Accelerator

• CMS Detector

• Trigger/DAQ - L1T, HLT

• Higgs• gg Fusion

• Associated Production, WW Fusion

• SUSY

• Exotica (Composites, Z’, Extra Dimensions, …)

• HI Program


LHC SignificanceLHC SignificanceLHC SignificanceLHC Significance

Higgs boson

t quark

b quark

s quark

ISR

Tevatron

SPEAR

SppS

TRISTAN

LEPII

CESR

Prin-Stan

Accelerators

electron

hadron

W, Z bosons

c quark

LHC

PEP

SLC

1960 1970 1980 1990 2000

Starting Year2010

10-1

100

101

102

103

104

Con

stit

uent

CM

Ene

rgy

(GeV

)

LHC will be the first big jump in C.M. energy and luminosity in 20 years. Based on the last 40 years of HEP, new phenomena are expected.


LHC ScheduleLHC ScheduleLHC ScheduleLHC Schedule

Blue is the planned schedule. Red is just in time. Issues of SC cable and cold masses (vendors) are solved. Testing at CERN is now the CP for dipoles – and cryoline installation. There is no reason to assume that the CERN schedule will not be ~ met. Three shift operation -> sector test in Spring 2006. Collisions in April 2007. Physics run (10 fb -1) starting in late 2007 ?.


The CMS DetectorThe CMS DetectorThe CMS DetectorThe CMS Detector

MUON BARREL

CALORIMETERS

ECAL

SUPERCONDUCTINGCOIL

IRON YOKE

TRACKER

MUONENDCAPS

HCAL

Basic Choices:

Strong, large B field (4T)

All Si tracking (L)

Best possible ECAL dE/E

Robust Muon - yoke


Magnet Coil : ~ 2/3 doneMagnet Coil : ~ 2/3 doneMagnet Coil : ~ 2/3 doneMagnet Coil : ~ 2/3 done

Expect the 5 modules at CERN by Nov., 2004 Start cooling in March 2005 Complete SX5 magnet test on Oct, 2005 Lower CMS into UX5 – 1.5 yr before LHC Lower CMS into UX5 – 1.5 yr before LHC beambeam


Trial Test of Coil InsertionTrial Test of Coil InsertionTrial Test of Coil InsertionTrial Test of Coil Insertion

Simulation ofcoil radial extent

Assembly of CMS proceeding in the surface hall (SX5).


CMS Tracker – All SiCMS Tracker – All SiCMS Tracker – All SiCMS Tracker – All Si

5.4 m

Outer Barrel –TOB-

Inner Barrel –TIB-

End cap –TEC-Pixel

2,4

m

Inner Disks –TID-

210 m2 of silicon sensors6,136 Thin detectors (1 sensor)9,096 Thick detectors (2 sensors)9,648,128 electronics channels


ECAL Test Beam ModuleECAL Test Beam ModuleECAL Test Beam ModuleECAL Test Beam Module

PbWO4 crystals. Fast and rad hard but light output is low APD. Electronics is IBM 0.25 um which is radiation hard.


HCAL : HB and HEHCAL : HB and HEHCAL : HB and HEHCAL : HB and HE

Back-flange18 Brackets3 Layers of absorber

Scintillator + brass. Use HPD and QIE.


Endcap Muon ChambersEndcap Muon ChambersEndcap Muon ChambersEndcap Muon Chambers

Endcap return yoke and CSC


Detector Performance/StatusDetector Performance/StatusDetector Performance/StatusDetector Performance/Status

• TTC vetted, 25 nsec test beam in 2003, ESR passed, 0.25 m commonality, GOL standard.

• Pixels – occupancy ~0.0001, impact ~ 15 m, R&D. production in 2005.

• SiTrkr – pre-production, dpT/pT~0.02 at 100 GeV. Full production in 2005.

• Calor – production, timing with laser, calib with construction data. Testbeam G4 data set, cosmic muons. Minbias, Z -> ee, t -> Wb, J-J and J - in situ.

• Muons – production, slice tests, alignment, trigger primitives on cosmic muons.


DAQ TDR: Level-1 TriggerDAQ TDR: Level-1 TriggerDAQ TDR: Level-1 TriggerDAQ TDR: Level-1 Trigger

Information from calorimeters

and muon detectors• Electron/photon triggers

• Jet and missing ET triggers

• Muon triggers

High efficiency for discovery level Physics with ~ 30 kHz bandwidth (~ 3x headroom)


Level-1 Trigger Table (10Level-1 Trigger Table (103434))Level-1 Trigger Table (10Level-1 Trigger Table (103434))

Trigger Threshold

(GeV or GeV/c)

Rate (kHz) Cumulative Rate (kHz)

Isolated e/ 34 6.5 6.5

Di-e/ 19 3.3 9.4

Isolated muon 20 6.2 15.6

Di-muon 5 1.7 17.3

Single tau-jet 101 5.3 22.6

Di-tau-jet 67 3.6 25.0

1-jet, 3-jet, 4-jet 250, 110, 95 3.0 26.7

Jet*ETmiss 113*70 4.5 30.4

Electron*jet 25*52 1.3 31.7

Muon*jet 15*40 0.8 32.5

Min-bias 1.0 33.5

TOTAL 33.5

L1 Trigger on leptons, jets, missing ET and calib/minbias


Minimum Bias EventsMinimum Bias Events Minimum Bias EventsMinimum Bias Events

• Pileup must be understood in dealing with Physics.

• Isolation criteria are applied and efficiency must be understood.

• A fast calibration to reduce the number of calorimeter constants

• Use symmetry of deposited energy to inter-calibrate calorimeter towers within rings of constant

BarrelCMS Note 2003-031

D.F

ut y

an ,

C.S

ee

z


DAQ TDR: DAQ DAQ TDR: DAQ DAQ TDR: DAQ DAQ TDR: DAQ

• Event size: 1MB from ~700 front-end electronics modules

• Level-1 decision time: ~3s — ~1s actual processing(the rest in transmission delays)

• DAQ designed to accept Level-1 rate of 100kHz

• Modular DAQ: 8 x 12.5kHz units

• HLT designed to output O(102)Hz – rejection of 1000

• DAQ factorizes by 8x


HLT Selection - HLT Selection - HLT Selection - HLT Selection -

-leptons• Level-2:

calorimetric reconstruction and isolation

• Very narrow jet surrounded by isolation cone

• Level-3: tracker isolation


HLT Electron Selection: Level-2HLT Electron Selection: Level-2HLT Electron Selection: Level-2HLT Electron Selection: Level-2

“Level-2” electron:

• Search for match to Level-1 trigger

• Use 1-tower margin around 4x4-tower trigger region

• Bremsstrahlung recovery “super-clustering”

• Select highest ET cluster

Brem recovery:

• Road along in narrow -window around seed

• Collect all sub-clusters in road “super-cluster”

basic cluster

super-cluster


HLT Electron Selection: Level-2.5HLT Electron Selection: Level-2.5HLT Electron Selection: Level-2.5HLT Electron Selection: Level-2.5

Most e triggers are neutrals use pixel information

• Very fast, large rejection with high efficiency

• Before most material before most bremsstrahlung, and before most conversions

• Number of potential hits is 3, so demanding 2 hits is quite efficient

Full pixel system

Staged option


HLT and Physics EfficiencyHLT and Physics EfficiencyHLT and Physics EfficiencyHLT and Physics Efficiency


HLT Performance HLT Performance — Efficiency— EfficiencyHLT Performance HLT Performance — Efficiency— Efficiency

Channel Efficiency

(for fiducial objects)

H(115 GeV) 77%

H(160 GeV)WW* 2 92%

H(150 GeV)ZZ4 98%

A/H(200 GeV)2 45%

SUSY (~0.5 TeV sparticles) ~60%

With RP-violation ~20%

We 67% (||<2.1, 60%)

W 69% (||<2.1, 50%)

tX 72%


Preparing for PhysicsPreparing for PhysicsPreparing for PhysicsPreparing for Physics

To do the Physics well, we must – by 2007:

• Commission – SX5, slice tests, trigger primitives, portable DAQ, pulsers, lasers, cosmics

• Calibrate – test beam, sources, lasers, muons

• Align – muons, photogrammetry, proximity sensors

• Deploy Core Software – data challenges, calib samples (W, Z, JJ, J, minbias)


SWC ChallengesSWC ChallengesSWC ChallengesSWC Challenges


Physics TDR goalsPhysics TDR goalsPhysics TDR goalsPhysics TDR goals

Physics TDR is a test of validity/readiness of CMS to extract initial Physics

• Readiness of software, computing and people’s knowledge, skills

• Next step is the Physics TDR so that

It is:

• an opportunity to write, debug, clean, re-write our software

• a test/chance to tune data-handling and distributed analysis

• re-evaluate our (detector/software) strengths and weaknesses

• the way to identify priorities at T0, plus general time-scales

• e.g. SUSY shows up quickly

• a way to learn the new system (start in late 2003, end in 2005)

• Necessary input to major computing procurements in 2006.


Higgs ProductionHiggs ProductionHiggs ProductionHiggs Production


Higgs Decay ModesHiggs Decay ModesHiggs Decay ModesHiggs Decay Modes

Goal is to measure mass, total width and several partial widths to confront the SM incisively. At low mass, several couplings are measurable. At higher masses WW and ZZ dominate.


““Higgs” Quantum NumbersHiggs” Quantum Numbers““Higgs” Quantum NumbersHiggs” Quantum Numbers

•If the 2 photon mode is observed then “H” is not a vector (Yangs’ theorem).

•If the “H” is the SM Higgs then the leptons are ~ collinear in a WW decay.

•If the ZZ decay is seen then a P = + state has decay planes aligned – P = - has planes orthogonal .

1 2x 1 2


Associated Production - HttAssociated Production - HttAssociated Production - HttAssociated Production - Htt

H is radiated in a tt final state. At low H mass the cross section is sufficient to extract a clean signal in the dominant H -> bb decay mode. In addition, a “control” sample arises from the ttZ state with a leptonic Z decay (same Feynman diagrams).


Htt Associated ProductionHtt Associated ProductionHtt Associated ProductionHtt Associated Production

Good b tagging is clearly essential.

ttZ can be used to measure the background in bb using leptonic Z decays.

Most background processes have large scale uncertainties.


H Production from W+WH Production from W+WH Production from W+WH Production from W+W

Use the EW radiation of a W by a quark. The “effective W approximation” analogous to the WW approximation. Need good jet coverage to low PT and small angles. Cross section depends only on the Higgs coupling to W, Z.


qqH,H -> W+W* -> qqH,H -> W+W* -> qqH,H -> W+W* -> qqH,H -> W+W* ->

SM H leads to ~ collinear and low mass lepton pairs. qqH is most useful for H masses > 140 GeV.


Higgs Summary in CMSHiggs Summary in CMSHiggs Summary in CMSHiggs Summary in CMS

For 10 fb-1, or 1 year at 1/10 of design luminosity almost all the allowed range for a SM Higgs is covered.

CMS must be ready to quickly and incisively analyze the early LHC data.

qqW, WW*, ZZ* are the discovery modes at low mass.


Higgs Self Coupling Higgs Self Coupling Higgs Self Coupling Higgs Self Coupling

Baur, Plehn, Rainwater HH W+ W- W+ W- jj jj

Find the Higgs? If the H mass is known, then the SM H potential is completely known HH prediction. If H is found, measure self-couplings, but ultimately SLHC is needed. The plan is for 10x increase in luminosity ~ 2013.


WW Fusion into ZZWW Fusion into ZZWW Fusion into ZZWW Fusion into ZZ

No Higgs? Look at VV scattering. Process depends only on VVV, VVVV couplings. Not viable at Tevatron. In SM cross section -> a constant, angular distribution is F/B peaked, and WLWL flux dominates. If no H then possibly large enhancement due to TT scattering.


W+W -> Z + Z Angular DistributionW+W -> Z + Z Angular DistributionW+W -> Z + Z Angular DistributionW+W -> Z + Z Angular Distribution

If there is a SM H then the distribution is very F/B peaked. If not, then the cross section may have a dramatic (~ 80 x) increase and the angular distribution may become isotropic – e.g. pure quartic. Need SLHC to push to ZZ masses > 1 TeV.


SUSY ?SUSY ?SUSY ?SUSY ?

Why SUSY?

•GUT Mass scale, unification

•Improved Weinberg angle prediction

•p decay rate

•Neutrino mass (seesaw)

•Mass hierarchy – Planck/EW

•String connectionsMMSM has ~ SM light h and ~ mass degenerate H,A. LSP is neutralino. Squarks and gluinos are heavy.


WMAP and Other ConstraintsWMAP and Other ConstraintsWMAP and Other ConstraintsWMAP and Other Constraints

LEP2

g-2

WMAP

LSP is neutral

b s


SUSY Cross Sections at LHCSUSY Cross Sections at LHCSUSY Cross Sections at LHCSUSY Cross Sections at LHC

Squarks and gluinos are most copious (strong production). Cascade decay to LSP ( ) study jets and missing energy. E.g. 600 GeV squark. Dramatic event signatures and large cross section mean we will discover SUSY quickly, if it exists.

01


SUSY – Mass “Reach”SUSY – Mass “Reach”SUSY – Mass “Reach”SUSY – Mass “Reach”

WMAP

1 year at 1/10 design luminosity.

SUSY discovery would happen quickly.


SUSY – Mass ScaleSUSY – Mass Scale SUSY – Mass ScaleSUSY – Mass Scale

Effective mass “tracks”squark/gluino mass well

4

1

( ) ( jets)eff T TM P P

1 year at l/10th design luminosity

Will immediately start to measure the fundamental SUSY parameters.

With 4 jets + missing energy the SUSY mass scale can be established to 20 %.


Sparticle CascadesSparticle CascadesSparticle CascadesSparticle Cascades

Use SUSY cascades to the stable LSP to sort out the new spectroscopy.

Decay chain used is :

Then

And

Final state is

02

02b b

g b b

1o

01b b


Sparticle MassesSparticle MassesSparticle MassesSparticle Masses

2-body decay: edge in Mll

10 fb-1

An example of the kind of analysis done, from 1 year at 1/10th design luminosity.


Full CMS Exposure – Full CMS Exposure – Reconstruction of Heavy StatesReconstruction of Heavy States

Full CMS Exposure – Full CMS Exposure – Reconstruction of Heavy StatesReconstruction of Heavy States

0 02 1 2

ob b g b b


SUSY Higgs must be light, < 130 GeV

Signature: B-jets + lepton + ETmiss

Requires b-tagging + jet counting + full calorimeter coverage for ET

miss

h Decays to b pairsh Decays to b pairsh Decays to b pairsh Decays to b pairs


A to A to + + to Leptons to LeptonsA to A to + + to Leptons to Leptons

Fast simulations of b and tau tags. Tau decays to leptons. Background from Z, tt, Wtb


A,H to A,H to + + to Hadrons to HadronsA,H to A,H to + + to Hadrons to Hadrons

Even in the minimal model, there is a large parameter space. This study uses hadronic tau decays. A and H are nearly mass degenerate.


HH++-> t + b-> t + bHH++-> t + b-> t + b

Charged Higgs decay into quarks. Top decays to W+b with W decay to leptons supplying the trigger. H couples preferentially to high mass t quark.


Heavy SUSY Higgs - 10 fbHeavy SUSY Higgs - 10 fb-1-1 Heavy SUSY Higgs - 10 fbHeavy SUSY Higgs - 10 fb-1-1

A / H tan =30, mA=130 GeV

A / H tan =40, mA=200 GeV

Some parts of the parameter space are not covered using dilepton decays of H,A.


is the jet-jet C.M.scattering angle.If contact interactions excess at low , S wave scattering . Reach of CMS is ~ 20 TeV. CanPush up with SLHC.

No Higgs? No SUSY? Weak interactions will become strong.2-jet events: expect excess of high-ET centrally produced jets if quarks are composites (a la Rutherford).

Composites - JetsComposites - JetsComposites - JetsComposites - Jets

ˆ ˆ(1 cos ) /(1 cos )


Early Physics Reach – q*Early Physics Reach – q*Early Physics Reach – q*Early Physics Reach – q*

If the calorimetry is understood, resonances up to a few TeV in mass are accessible early in the LHC run. (R. Harris) SLHC gives ~ 20% increase in mass reach.


Composites - DYComposites - DYComposites - DYComposites - DY

Search for lepton composites in D-Y production of dilepton pairs. At masses above the Z there is no known resonant state. Reach is ~ 20 TeV. Early reach is ~ 5 TeV for 10 fb-1.


Extra DimensionsExtra DimensionsExtra DimensionsExtra Dimensions

Number (D) of space-time dimensions form of force observed• E+M: F~1/r2 because D=3+1

• For “flatlanders” confined to live in D=2+1 dimensions, E+M is perceived to be a F~1/r force

Inspired by “string theory” which naturally incorporates SUSY and which requires extra dimensions to be self consistent. The extra dimensions required by strings may be at the Plank scale or at the TeV scale, In the latter case there is no hierarchy problem.


TeV Scale Extra Dimension TeV Scale Extra Dimension TeV Scale Extra Dimension TeV Scale Extra Dimension

KK excitations of the , Z in D-Y LHC at 600 fb-1 has a reach to 6 TeV. SLHC would push out 30% further.

Black hole production Democratic Hawking evaporation copious Higgs production. Study with full CMS simulation.


Black Hole Production at CMSBlack Hole Production at CMSBlack Hole Production at CMSBlack Hole Production at CMS

If the extra dimensions are ~ If the extra dimensions are ~ TeV scale, then black holes TeV scale, then black holes should be produced at the should be produced at the LHC. LHC. Black holes decay immediately ( ~ 10-26 s) by Hawking radiation (democratic evaporation) :large multiplicity, small missing E, jets/leptons ~ 5.

A black hole event with MBH ~ 8 TeV

Spectacular signature !


Heavy Ion Physics in CMSHeavy Ion Physics in CMSHeavy Ion Physics in CMSHeavy Ion Physics in CMS

Study properties of hot nuclear matter, plasma of quarks and gluons• Use high pT jets and quarkonia as probes of the medium

• Jet quenching, a new QCD process

• Production and survival of quarkonia: J/ ,• Study as a function of nuclear geometry

Compare to p+p: minimum bias physics at the start of LHC

q

q

q

q

p+p Ion+Ion


HI Measurements in CMSHI Measurements in CMSHI Measurements in CMSHI Measurements in CMS

Excellent detector for high pT probes:

• High rates and large cross sections

• quarkonia (J/ ,) and heavy quarks (bb)

• high pT jets, including detailed studies of jet fragmentation

• high energy photons, Z0

• Correlations

• jet-• jet-Z0

• multijets

Global event characterization

• Energy flow in wide rapidity range

• Charged particle multiplicity

• Centrality

CMS can use highest luminosities available at LHC both in A+A and p+A modes

• DAQ and Trigger uniquely suited to dual-mode experimentation

-


Jet Quenching at RHICJet Quenching at RHICJet Quenching at RHICJet Quenching at RHIC

STAR

CMS


Summary and ConclusionsSummary and ConclusionsSummary and ConclusionsSummary and Conclusions

• CMS is designed for discovery• Trigger strategy is sound (e.g. no L2)• Higgs is ~ assured of discovery if it

exists.• SUSY is ~ assured if it exists as a

solution of the Hierarchy Problem.• Discoveries will come early because

energy matters. CMS must be ready on day one. Next step is the Physics TDR.

• With the SLHC the program at CMS will span decades.


CMS Tracking - CrossingCMS Tracking - CrossingCMS Tracking - CrossingCMS Tracking - Crossing


ECAL – PbWO CrystalsECAL – PbWO CrystalsECAL – PbWO CrystalsECAL – PbWO Crystals

Fully active detector – transverse size ~ Xo


CMS ECAL CalibrationCMS ECAL Calibration CMS ECAL CalibrationCMS ECAL Calibration

1. Lab measurements of all modules; light yield, APD gain etc. 4.5 %

2. Testbeam precalibration transported to CMS (for 25% of detector) 2.0 %

• Distributed within detector, as “standard candle”

3. Min-bias phi symmetry 2 %

• Fast calibration to reduce number of calibration constants

4. Z e+e- 0.5 % (design value)

• Needs tracking in Si-tracker• Within ~2 months

5. Laser monitoring system over time to monitor crystal transparency

APDs

Total ~85,000 channels


225 GeV muon

beam

beam

100 GeV electron

AD

C c

ount

s

beam

300 GeV pion

HCAL 2002 Test BeamHCAL 2002 Test BeamHCAL 2002 Test BeamHCAL 2002 Test Beam


Measurement of HO muon signal for RPC trigger (Goal: use the HO as part of muon trigger)

beamHO

HO SignalPedestal Subtracted

Pedestal Distribution

HO in 2002 Test BeamHO in 2002 Test BeamHO in 2002 Test BeamHO in 2002 Test Beam


Resolution Linearity

Check Monte Carlo – G4Check Monte Carlo – G4Check Monte Carlo – G4Check Monte Carlo – G4


Muon System – 4 StationsMuon System – 4 StationsMuon System – 4 StationsMuon System – 4 Stations

HO


Muon Performance - BMuon Performance - BssMuon Performance - BMuon Performance - Bss

Lvl-1 Lvl-1 HLT HLT Global Global Events/ 10fbEvents/ 10fb-1-1 Trigger RateTrigger Rate

15.2%15.2% 33.5%33.5% 5.1%5.1% 4747 <1.7Hz<1.7Hz

Offline analysis results (hep-ph/9907256), using SM BR=3.5x10-9

(Lvl-1 trigger in ||<2.4 instead of ||< 2.1)10 fb-1 => 7 signal events with <1 background

5 observation with 30 fb-1

= 46 MeV= 46 MeV


Level-1 Trigger Table (2x10Level-1 Trigger Table (2x103333))Level-1 Trigger Table (2x10Level-1 Trigger Table (2x103333))

Trigger Threshold

(GeV)

Rate (kHz) Cumulative Rate (kHz)

Isolated e/ 29 3.3 3.3

Di-e/ 17 1.3 4.3

Isolated muon 14 2.7 7.0

Di-muon 3 0.9 7.9

Single tau-jet 86 2.2 10.1

Di-tau-jet 59 1.0 10.9

1-jet, 3-jet, 4-jet 177, 86, 70 3.0 12.5

Jet*ETmiss 88*46 2.3 14.3

Electron*jet 21*45 0.8 15.1

Min-bias 0.9 16.0

TOTAL 16.0


HLT Summary: 2x10HLT Summary: 2x103333 cm cm-2-2ss-1-1HLT Summary: 2x10HLT Summary: 2x103333 cm cm-2-2ss-1-1

Trigger Threshold(GeV or GeV/c)

Rate (Hz) Cuml. rate (Hz)

Inclusive electron 29 33 33

Di-electron 17 1 34

Inclusive photon 80 4 38

Di-photon 40, 25 5 43

Inclusive muon 19 25 68

Di-muon 7 4 72

Inclusive tau-jet 86 3 75

Di-tau-jet 59 1 76

1-jet * ETmiss 180 * 123 5 81

1-jet OR 3-jet OR 4-jet

657, 247, 113 9 89

Electron * jet 19 * 45 2 90

Inclusive b-jet 237 5 95

Calibration etc 10 105

TOTAL 105


B Tagging EfficiencyB Tagging EfficiencyB Tagging EfficiencyB Tagging Efficiency

The actual light quark rejection and b quark acceptance as a function of ET will only be known when the actual environment and performance of the tracker is known.


Standard Model PhysicsStandard Model PhysicsStandard Model PhysicsStandard Model Physics

Yields Cross section(nb)

Acceptance (1 in <2.1)

Eff. after HLT with isolation

Yield for 10

fb-1

W 19.6 50 % 69 % 7 × 107

Z 1.84 71 % 92 % 1.1 × 107

tt WbWb +X 0.126 86 % 72 % 7.8 ×

105

• rare top decays

• precision measurements of top couplings and properties

• EW boson triple gauge couplings

An example: standard model physics using muons, CMS


Muon Trigger EfficienciesMuon Trigger EfficienciesMuon Trigger EfficienciesMuon Trigger Efficiencies


Higgs Mass – Low?Higgs Mass – Low?Higgs Mass – Low?Higgs Mass – Low?

102

103

10-3

10-2

10-1

100

101

102

103 Higgs Width

MH

(GeV)

H

(Ge

V)

Current EW data indicates a low mass H. SUSY requires a low mass H. The mass width is then likely to be small < experimental resolution ECAL


Low Mass Higgs Low Mass Higgs Low Mass Higgs Low Mass Higgs

H: decay is rare (B~10-3)• But with good resolution, one gets a mass

peak

• Motivation for PbWO4

calorimeter

• CMS: at 100 GeV, 1GeV

• S/B 1:20


Intermediate Mass HiggsIntermediate Mass HiggsIntermediate Mass HiggsIntermediate Mass Higgs

HZZ+–+– ( =e,)• Very clean

• Resolution: better than 1 GeV (around 100 GeV mass)

• Valid for the mass range 130<MH<600 GeV/c2


H -> Z + Z* -> 4H -> Z + Z* -> 4H -> Z + Z* -> 4H -> Z + Z* -> 4

V. Bartsch et al., Karlsruhe


H -> Z + Z -> 4 H -> Z + Z -> 4 H -> Z + Z -> 4 H -> Z + Z -> 4

Expected invariant mass distribution for L = 20 fb-1,

after selection. M. Sani et al., Firenze


High Mass HiggsHigh Mass HiggsHigh Mass HiggsHigh Mass Higgs

HZZ +–jet jet• Need higher Branching

fraction (also for the highest masses ~ 800 GeV/c2)

• At the limit of statistics


No Higgs? VV Scattering?No Higgs? VV Scattering?No Higgs? VV Scattering?No Higgs? VV Scattering?

If no Higgs look at VV scattering? Individual diagrams diverge with C.M. energy. Total set of 3 EW diagrams approaches a constant. The ~ isotropic distribution of each diagram becomes a F/B peak in the sum of the 3 EW diagrams.


SUSY and Grand UnificationSUSY and Grand UnificationSUSY and Grand UnificationSUSY and Grand Unification


Minimal SUSYMinimal SUSYMinimal SUSYMinimal SUSY

2 vev (ratio tan sign ) 2 masses (at GUT scale), soft SUSY breaking. Leads to 5 Higgs, sleptons, gauginos (LSP) and squarks and gluinos (higher mass0


SUSY Mass ReachSUSY Mass ReachSUSY Mass ReachSUSY Mass Reach


Supersymmetry Supersymmetry Supersymmetry Supersymmetry

CMS

tan=10

5 contours

Impact of the SLHCExtending the discovery regionby roughly 0.5 TeV i.e. from ~2.5 TeV 3 TeV

This extension involved highET jets/leptons and missing ET

Not compromised by increased pile-up at SLHC


SUSY - DisoverySUSY - DisoverySUSY - DisoverySUSY - Disovery

4

1

( ) ( jets)eff T TM P P

backgrounds

SUSY600 GeV

squark

Dramatic event signatures and large cross section mean we will discover SUSY quickly, if it exists.


Sparticle Mass MeasurementsSparticle Mass MeasurementsSparticle Mass MeasurementsSparticle Mass Measurements

Proposed Post-LEP Benchmarks for Supersymmetry (hep-ph/0106204)Proposed Post-LEP Benchmarks for Supersymmetry (hep-ph/0106204)


A, H to A, H to + + A, H to A, H to + +

A and H are ~ mass degenerate. B tag useful for backgrounds.


HH++ -> -> ++ + + HH++ -> -> ++ + +


Sparticle Reconstruction Sparticle Reconstruction Sparticle Reconstruction Sparticle Reconstruction


Sparticle ReconstructionSparticle ReconstructionSparticle ReconstructionSparticle Reconstruction


SUSY HiggsSUSY HiggsSUSY HiggsSUSY Higgs

Mass of h = mass of Z. With top loops the h mass is increased. However, mass of h is < 130 GeV. Thus, SUSY predicts a light “Higgs” ~ the SM Higgs.


Timing of Physics TDRTiming of Physics TDRTiming of Physics TDRTiming of Physics TDR

Physics TDR: start in 2003, end in 2005

Time scale determined by:• Desire to submit as late as possible

• To cover all software; to supplement it with real-life examples of prime physics analyses (training ground/ test of analysis chain).

• In 2006 we start procurements of major parts of the computing resources of the experiment

• And it’s the last point in time to make any major changes to the software infrastructure

• “T01.5”: near-optimal time to have this “test of Physics readiness”


CPT OrganizationCPT OrganizationCPT OrganizationCPT Organization

ECAL/e/C. Seez

HiggsS. Nikitenko

TRACKER/b-M.Mannelli,L.Silvestris

SUSY & Beyond SM

L. Pape

HCAL/JetMETJ.Rohlf,C.Tully

Standard Model

J. Mnich

MuonsD. Acosta,

U.Gasparini

Heavy IonsB. Wyslouch

Resource ManagerI. Willers

Technical Coordinator

L. Taylor

Arch, Frmwrks &

ToolkitsV. Innocente

Regional Centers

L. Bauerdick

Librarian ServicesS. Ashby

Production & data mgmt

T. Wildish

GRID Integration

C. Grandi

Computing infrastructure

N. Sinanis

Online Farm

Online Filter Software

CCS PM D. Stickland

PRS PM P. Sphicas

TRIDAS (Onl. Farm)

PM S. Cittolin

CPT Institution Board

Reconstruction project S. Wynhoff

Simulation project A. DeRoeck

Documents

Cornell Seminar, Oct. 4, 20041 Physics at CMS Status of CMS and US CMS Dan Green Fermilab October 6, 2004