W.Murray PPD 1Summary & plenary

Conference Summary and Plenary talk

Bill MurraySTFC/RAL/STFC

KolkataWin 07

W.Murray PPD 2

Saha Institute of Nuclear Physics

SINP is large instituteCyclotron

We did not see it

GuardedMiddle-class planned suburb of Kolkata

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Kolkata industry

Booming industriesLots of hi-tech jobsIts going forward

W.Murray PPD 4

But cross the canal by SINP:

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W.Murray PPD 6

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And the construction?Puts ATLAS to shame

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Conference Overview

Plenary talks on EW symmetry breaking (Theory/expt)Weak decays (Theory/expt)Neutrino Physics (Theory/expt)Astroparticle Physics (Theory/expt)

Four 'working groups' (Parallel talks)Plenaries on:

Neutrino factory scoping studyINOWorking group summaries

I will not talk about very useful pedagogical lectures eg EW theory ideas and dark energy

W.Murray PPD 9

Weak decays

B to s gammaSensitive to new loop?

B to τ ν Sensitive to charged Higgs

10

2006: 2006: φφ11 with with bb →→ ss Penguins PenguinsSmaller than b→ccs in all of 9 modes

Theory tends to predict positive shifts(originating from phase in Vts)

Naïve average of all b → s modes

sin2βeff = 0.52 ± 0.052.6 σ deviation betweenpenguin and tree (b → s) ( b → c)

More statistics crucial for mode-by-mode studies

11

B B →→ τντν : Experimental Challenge : Experimental Challenge

N= 680keff.= 0.29% purity = 57%

Charged B

(*)0 (*)1/ / / SB D a D

0 0 0/D D sD

Tag-side: Full reconstruction

449M BB

Υ(4S)e− (8GeV)

e+(3.5GeV)

B

Bπ

τν signal

4-momentum determined B meson beam !

12

B B →→ τντν results results

Belle Hadronic tag

τ+ → e+νν (eff: 4.1%), µ+νν (2.4%), π+ν (4.9%), π+π0ν (1.2%)

D l ν tage+νν (3.6%) µ+νν (2.4 %)π+ν (4.9%) π+

π0ν (2.0%)πππν (0.8%)

First evidence, 3.5 σNo clear signal

Belle BaBarPRL97, 251802 (2006). hep-ex/0608019

13

Constraints on HConstraints on H±± mass mass

rH=1.13±0.51

Use known fB and |Vub |

Ratio to the SM BF.2

22

(1 tan )BH

H

mr

m

excluded

excl

uded

449M

W.Murray PPD 14

τ pairs in CDF

Find τ particle pairsCalculate mass of parent

Assuming they have one

Compare data with simulated backgroundsGood evidence for Z to ττ

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Φ to ττ in CDF

Now compare with expectation if the 'Φ' exists with mass 160GeVTwo sigma excess...Requires tan-beta around 50

16

CDF CDF ττ pair signal pair signal

excluded

excl

uded

449M

• CDF possibilityCDF possibility• Just sneaks into Just sneaks into

allowed region!allowed region!

W.Murray PPD 17

Neutrino Physics

B to s gammaSensitive to new loop?

B to τ ν Sensitive to charged Higgs

Future Precision with Reactor Experiments

identical detectors many errors cancel

E=4MeV 2km 4km 40km 80km

Double Chooz Daya Bay Reno? An-gra? Triple Chooz?

-

3 flavour effectno degeneraciesno correlationsno matter effects

W.Murray PPD 19

Sterile Neutrinos

Interesting discussion from Palash PalAllow sterile neutrino to give ΛCDM

Unfortunately the end of his talk is not in the web archive...Suggestion was:

1 light sterile neutrino for dark matter2 heavy ones for leptogenesis

W.Murray PPD 20

Light Neutrinos

Neutrino number in WMAP fitNeutrinos freestream

Smooth higher moments

Also affected by neutrino mass

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Sterile Neutrinos

Sterile neutrinos can be cold dark matterIf θ small, out of thermal equilibrium, and:

W.Murray PPD 22

Is this allowed?

Yes!

Highest energy cosmic rays: Pierre Auger project: energy spectrum

Presented by Markus Roth

4x statis-tics re-sults to appear soon!

Super GZK particles

PROBLEMS WITH SUSY :1. Little Hierarchy Problem 2. Flavour & CP Viol. Problem

-ht t~

mh > 114 GeV (LEP) m > 1 TeVt~

γeμ

−χ

e,~

µνe e

γe~

0χde

)(

10

~~

~,

e

e

mm

TeVm

νν

ν

µ

µ

≅

>)10(

102

,

~

−<

>

A

e TeVm

µφSplit SUSY solves 2 at the cost of aggravating1.

DCTeVm

BANoTeVm

o

f

&1

)&(1

,

~

⇒≈

⇒>>>

±χ

We shall consider a moremoderate option, allowing

TeVmf

10010~ −=

D. P. Roy: WHY SUSY :

B.Natural Soln to the Hierarchy Problem of EWSB

C.Natural (Radiative) Mechanism for EWSB

D.Natural Candidate for the cold DM (LSP)

E.Unification of Gauge Couplings @ GUT Scale

W.Murray PPD 25

ISS and NuFact

Major effort to consider status of this project

The ISS:

• Initiated at NuFact05, concluded at NuFact06:– Report now in preparation

• Goals:– Critical comparison of the performance of the three options– Establish a baseline for the accelerator and detector systems

requiredi.e. lay the foundations for a detailed International Design study leading to conceptual design report(s)

• Work of ISS carried out in three working groups:– Physics (convener Y. Nagashima, Osaka)– Accelerator (convener M. Zisman, LBNL)– Detector (convener A. Blondel, Geneva)– Overall coordination via Programme Committee chaired by P.

Dornan, Imperial

The International Scoping Studyof a future Neutrino Factory and super-beam facility

Two main physics strategies

use of the high neutrino rate (>1020/year) and energy (10-50 GeV) of Neutrino Factory + LMD (“Super-MINOS”) detector of large but not huge mass (50-100 Kt), necessarily magnetic (a dense magnetized Iron detector, or, possibly, Li-Argon, TASD), a few 1000 Km away.

µ ⇒ νe + νµ

• The options are only of two types, really

Two main physics strategies

use of the lower neutrino rate (1018-19/year) and energy (sub-GeV) of Betabeam + Megaton (“Hyper-Kamioka”) low density detector of very large mass (0.5-1 Mt) and volume (0.5-1 Mm3) non magnetic (a Water Cerenkov detector, or possibly, again Li-Argon,

TASD), a few 100 Km away. … or more

β ⇒ νe

• The options are only of two types, really

Mid-energy region: QE+ 1π + nπ

Super beam (Numi off, T2KK, CNGS+) high Energy beta-beam (CERN highQ or SPS+)

WATER CHERENKOV (Mton)TASD (NOvA), Larg TPC

Low energy region: QE dominates

Low energy super beam (T2K, T2HK, T2KK, Frejus)Low energy beta-beam (CERN baseline scenario)

WATER CHERENKOV (Mton)

High-energy region: DIS

Neutrino Factory

Magnetized Iron Emulsion

large magnet around: emulsion, TASD, Larg

Executive summary: baseline detectors

straightforward from MINOSsimulation+physics studiesibid vs OPERA

~100kton magnetized iron calorimeter (golden)wrong sign muons+ ~10 kton non-magnetic ECC (silver)wrong-sign tau (mu decay)

Neutrino Factory (20-50 GeV, 2000-7000km)

photosensors and detectorslong drifts, long wires, LEMs

no established baselineTASD (NOvA-like)Liquid Argon TPCor Megaton WC

1-5 GeVBB and SB

photosensors!cavern and infrastructure

Megaton WCsub-GeVBB and SB (MEMPHYS, T2K)

R&D neededFar detectorbeam

• The mid term goal : 2012 or so …. decision time

• LHC results well established

• ILC decision taken

• debt and WW LHC spending closing thou upgrade costs will not be negligible,

“2012” likely to be when new investments will be possible

• T2K, DCHOOZ result on θ13 , if no other before

• choice of ν beam + detector mature

We should not fail to have a consensual & convincing proposal fully ready by then

NB if we make it so

INOIndian Neutrino Observatory for Atmospheric neutrinos

Site at Pykara Ultimate Stage Hydro Electric Project (PUSHEP) TamilnaduDetector magetized iron and RPC’s.

Location of INOLocation of INO

Physics with Neutrino beam from NUFACT – Physics with Neutrino beam from NUFACT – Phase IIPhase II

• Determination of Determination of θθ1313

• Sign of Sign of ∆∆mm222323

• Probing CP violation in leptonic sectorProbing CP violation in leptonic sector

Current India­based Neutrino Observatory initiativeCurrent India­based Neutrino Observatory initiative

• Two phase approach:Two phase approach:

R & D and ConstructionR & D and ConstructionPhase I Phase I

Physics studies,Physics studies,Detector R & D,Detector R & D,Site survey,Site survey,Human resource deHuman resource de--velopment velopment

Phase IIPhase IIConstruction of the Construction of the detectordetector

Operation of the DetectorOperation of the Detector

Phase IPhase IPhysics with Atmospheric NeutrinosPhysics with Atmospheric Neutrinos

Phase IIPhase IIPhysics with Neutrino beam from Physics with Neutrino beam from

a factorya factory

GoalGoal:: A large mass detector with charge identification capability A large mass detector with charge identification capability

Physics using atmospheric neutrinos during Phase IPhysics using atmospheric neutrinos during Phase I

• Reconfirm atmospheric neutrino oscillationReconfirm atmospheric neutrino oscillation• Improved measurement of oscillation parametersImproved measurement of oscillation parameters• Search for potential matter effect in neutrino Search for potential matter effect in neutrino

oscillationoscillation

• Determining the sign of Determining the sign of ∆∆mm222323 using matter effect using matter effect

• Measuring deviation from maximal mixing for Measuring deviation from maximal mixing for θθ2323

• Probing CP and CPT violationProbing CP and CPT violation• Constraining long range leptonic forcesConstraining long range leptonic forces• Ultra high energy neutrinos and muonsUltra high energy neutrinos and muons

Recent developmentsRecent developments • INO Interim Project Report was presented to DAE and INO Interim Project Report was presented to DAE and

DST on 1 May, 2005.DST on 1 May, 2005.• A presentation on INO proposal was made to SAC-PM A presentation on INO proposal was made to SAC-PM

in August 2005.in August 2005.• The proposal was recommended by the Indian HEP-NP The proposal was recommended by the Indian HEP-NP

community at a meeting at Mumbai in March 2006 community at a meeting at Mumbai in March 2006 sponsored jointly by DAE and DST to define the road sponsored jointly by DAE and DST to define the road map for High Energy and Nuclear Physics research in map for High Energy and Nuclear Physics research in India.India.

• It was discussed in the Mega Science Committee set up It was discussed in the Mega Science Committee set up by Planning Commission in September, 2006 and by Planning Commission in September, 2006 and recommended for funding in the XI th 5 year plan recommended for funding in the XI th 5 year plan starting from April 07.starting from April 07.

INO SummaryINO Summary• A large magnetised detector of 50-100 Kton is needed to A large magnetised detector of 50-100 Kton is needed to

achieve some of the very exciting physics goals using achieve some of the very exciting physics goals using atmospheric neutrinos.atmospheric neutrinos.

• Physics case for such a detector is strong.Physics case for such a detector is strong.• It will complement the existing and planned water It will complement the existing and planned water

cherenkov detectors.cherenkov detectors.• Can be used as a far detector during neutrino factory era.Can be used as a far detector during neutrino factory era.• We have started a very active R & D work towards building We have started a very active R & D work towards building

such a detector.such a detector.• Looking forward for international participation.Looking forward for international participation.

For more information on INO please visit the website For more information on INO please visit the website www.imsc.res.in/~inowww.imsc.res.in/~ino

W.Murray PPD 41

Bill MurrayRAL, CCLRCw.murray@rl.ac.uk

WIN 07, Kolkata15th January 2007

Experimental Status: E

le

ctroweak Symmetry Breaking

What is E-W symmetry breakingWhat are the known knowns?What are the known unknowns?What about the unknown unknowns?

W.Murray PPD 42

9 years ago..

“The LHC would certain-

ly ferret out the Higgs by

2007”

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What is E-W symmetry breaking?

This gauge symmetry predicts γ,W,Z,gluons Requires them to be massless

Symmetry breaking is needed for W/Z masses

SU(3) x SU(2) x U(1)

W.Murray PPD 44

How can it occur?

Preserver underlying symmetrySpontaneous or dynamical breakingPreserves ρ=1

(Relative strength of neutral and charged current interactions)

Higgs mechanism!

Dr Bhattacharyya will cover this in detail.

W.Murray PPD 45

Two experimental themes

Precision Electroweak dataIs ρ=1 true?Are the loop effects correctly seen?Can we predict the Higgs mass from them?Needs masses, couplings...

Direct Higgs searchWhat can we say about SM HiggsWhat does the future hold? And when?What about Super-symmetry?

W.Murray PPD 46

Precision Electroweak

Does the SM give MW, M

t and Z properties cor-

rectly?Z properties

Largely from LEP/SLCFinal: “Phys Rept. 427 (2006) 257”

W mass/widthLEP II resultsTevatron run ICDF Run II

Top massTevatron: Runs I and II

W.Murray PPD 47

Z Properties: LEP

Mz = 91.1876±0.0021GeV/c2

Γz =2.4952±0.0023GeV/c2

Coupling example: ρ and sin2θ

eff

Leptons precise B quarks incompatibleNon-universal EW corrections observed! Born level not quite correct – ρ close to 1

Born level

W.Murray PPD 48

W mass

LEP results are close to finalM

W = 80.376±0.033

Run 1 Tevatron results:M

W = 80.452±0.059

Now: CDF Run II resultBased on 200pb-1

http://fcdfwww.fnal.gov/physics/ewk/2007/wmass/wmass_conf.psSummary follows..

W.Murray PPD 49

CDF lepton quality plots:

Electron material modeling excellentAs is muon tracking description

Based on fitting ψ, φ data, validated at Z

E/P, electrons Z mass muons

W.Murray PPD 50

Measured Transverse mass

Backgrounds very lowAgreement of data with fit looks great

For electrons, p(χ2)=5x10-7 (stat only)But the data is really very impressive

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Improvements since run I

Huge improvements in ~all systematics

Systematic (MeV)Run I Run II

Electron Muon Electron MuonLepton energy scale 75 85 30 17Lepton energy resolution 25 20 9 3Recoil energy 37 35 12 12Backgrounds 5 25 8 9pT(W) 15 20 3 3Parton distribution 15 15 11 11QED radiation 20 10 11 12

W.Murray PPD 52

Combined W mass

New result compatible with existingMost precise single result

Only 200pb-1: much more to come

80.452±0.05980.376±0.03380.136±0.08480.392±0.02980.413±0.04880.398±0.025

W.Murray PPD 53

Top Mass measurement

A unique particle to the TevatronPair produced, top decays:

The semileptonic are often 'golden'The other decay modes contribute too.

Hadronic

Semileptonic e+mu

leptonic e+mu

taus

W.Murray PPD 54

Semi-leptonic channel

Clear leptonic signatureWith missing energy

But enough constraints to calculate neutrino Two b jets

All tops have theseB tagging important

W+jets is main backround

W.Murray PPD 55

Mass Extraction

Mass is fitted along with Jet Energy Scale

MW fixes scale

Using matrix element convoluted with resolutionUses all information in the event Biggest systematic: signal description

Mass of jjj combination

166 b-tagged candidates

W.Murray PPD 56

Comparison of channels

Example from CDFAll contributeBut lepton plus jets dominates

W.Murray PPD 57

Top by channel/experiment:

CDF results based on much more dataThe lepton plus jets channels dominate the average

MT=171.4±1.2±1.8

Systematics important – future gains will be hard work

W.Murray PPD 58

Combined Electroweak

The consistency of the data can be used to test the use of EW correctionIt also constrains the Higgs mass

W.Murray PPD 59

The Electroweak fit:N

ote

0.2G

eV

rang

e of

sca

le

Direct and indirect agree – predicting M top!

Also suggests m

H around

100GeV

LEP said M

H>114

5th Jan 07CDF M

W

W.Murray PPD 60

How is this χ2?

18 observableExpect:

5 1-2 sigma1 2+ sigma

See3 1-2 sigma1 2+ sigma

No problem!(Recent M

W not

included)

W.Murray PPD 61

Why believe in a light Higgs?

Electroweak fit(Z properties, W

and top mass) give at 95%:

MH<166GeV/c2

(MH<153 with CDF M

W)

MH<199GeV/c2

(including LEP bound)(189GeV with new M

W)

Summer 06

W.Murray PPD 62

Direct Searches

SM Higgs:Past: LEPPresent: TevatronFuture: LHC

Supersymmetry

W.Murray PPD 63

Higgs then: LEP SM Higgs

Final LEP result:

MH>114.4GeV(95%CL)

Excess at 115GeV would happen in 9% cases without

signal

Likelihood shown

W.Murray PPD 64

Higgs now: The Tevatron

Tevatron is running well, pp at 2TeV collision energy

2fb-1 deliveredRecords broken all the time

CDF and D0 are in great shapeRun II results coming out – top qualityB tagging working well (B

s oscillations!)

Entering the region of sensitivity to SM Higgs

W.Murray PPD 65

Higgs now: The Tevatron

2fb-1 enough for SM Higgs

sensitivity

W.Murray PPD 66

Tevatron Search channels

H WW l l→ → ν ν

WH WWW→

WH l bb→ ν

ZH bb→νν

ZH llbb→

100 110 120 130 140 150 160 170 180 190 200

Approximate ranges for channels

MH, GeV/c2

W.Murray PPD 67

ZH→llbb search

D0 plots of 0.9fb-1

Signal is ~50 times below backgroundBut well simulated and signal has mass peak

Sensitivity possible

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ZH→ννbb search; CDF

Double tagged mass distribution:Overall small excess in dataSignal 10% of background at peak

This is the most powerful channel

for light Higgs

W.Murray PPD 69

WH→lνbb with CDF

Small excess around 100GeVSignal 15 times below background

1 b tag 2 b tag

W.Murray PPD 70 HWW* : final selection

eµ

MH=160GeV (x10)

eµ

µµ

εe

950pb-1

W.Murray PPD 71

Combined Higgs boson Search @ CDF

All low mass channels analyses use 1 fb-1 of data

WH (lνbb)

ZH (l+l- bb)

ZH (ννbb)

H→WW >~ 120 GeV

For mH = 115 GeV, the 95%CL Limit/SM

is

9 (expected)

13 (observed)

W.Murray PPD 72

Tevatron SM Higgs Combination

mH Limit/SM(GeV) Exp. Obs.

115 7.6 10.4

130 10.1 10.6

160 5.0 3.9

180 7.5 5.8

Essentially equivalent to one experiment with 1.3 fb-1, since the experiments have “com-plementary” statistics at low and high mass

Tevatron is close to SM Higgs sensitivity

All CDF and DØ results from summer 06 combined

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Ingredients (DØ)Equiv Lumigain (@115)

Using ~330 pb-1 - 15 9

6.0 6.1 3.7

Combine DØ and CDF 2.0

NN b-Tagger/L0 3.0 3.5

NN analysis selections 1.7 2.7 2.8

Dijet-mass resolution 1.5 2.2

Increased Acceptance 1.2 2.0 2.5

New channels 1.2 1.9 2.1

1.7Reduced Systematics 1.21.2 1.5

⇒At 160 GeV needs ~5 fb-1

⇒At 115 GeV needs ~3 fb-1

Xsec Factor Xsec FactormH=115 GeV mH= 160 GeV

Lumi = 2.0 fb-1

95% CL exclusion for mH= 115-185 GeV with 8 fb-1

(assuming similar improvements at DØ and CDF)

Improvements planned/expected

W.Murray PPD 74

Tevatron Likelihood curve

The Tevatron Higgs log-likelihood

Small excess at 105GeVSmall deficit at 165GeV

Nothing to see here - move along.

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Let's be naughty

Log-likelihood curves can be addedThat's their great beauty

So, if we ASSUME there is a Higgs, and just want to extract its mass, we can add:

EW fitLEP Higgs search llTeVatron Higgs search ll

W.Murray PPD 76

Combined Likelihood

A Higgs near 115GeV still best fit

60 70 80 90 100 110 120 130 140 150 160 170 180 190 200-2

-1

0

1

2

3

4

5

6

LEP ll

EW

Tevatron

Sum

Very crudeNo systematics

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Next: The LHC

The 14TeV pp energy raises the Higgs cross section

c/f 2TeV Tevatron

Designed for 1034 luminosityc/f 2 1032 currently at Tevatron

Decades of preparation for this search

W.Murray PPD 78

LHC status

1000th dipole in ring

- Out of 1230

Collisions in 2007 planned

But at 900GeV C-o-M

W.Murray PPD 79

LHC Possible runs?

Don't shoot me...just random guesses

30fb-1 often used: Nominal first 3 years

Year Energy Luminosity TeV Total

2007 0.9 0.001 0.0012008 14 3 3

2009-2010 14 10 232011-2014 14 80 343

2017+ SLHC 14 1000 3000

Luminosity, fb-1 Per year

1028

1032-33

1033

1034

1035

W.Murray PPD 80

Rates?

LHC backgrounds!

Every event at a lepton collider is physics; every event at a hadron collider is background

Sam Ting

1010

W.Murray PPD 81

Rates in channels used

Rates in major channelsNo cuts, just branching ratiosl: e or μThousands of events to look for...

Far less will pass cuts

LEP

W.Murray PPD 82

Boson fusion: qq→qqH→ττ

Two forward jets, PT like M

W/2

Higgs products centralNo colourflow → suppressed central jetsZ→ττ plus two jets main background

Jet

Jet

ηJet

Jet

η

• ττ→lνl'ν', lν+jet final states (τ hadronic ident.)• ττ mass reconstruction: need PT

miss

Low mass

W.Murray PPD 83

qqH(→ττ) via VBF

Need to undestand tails in Z mass resolutionBut signal to background could be good

• S/√B~2.5 in one LHC yearCMS: 40 fb-1 for discovery in mH=120-140 GeV rangeATLAS: Maybe 20fb-1

• Measures Yukawa coupling Hττ

mZ

W.Murray PPD 84

H→γγ

Very rare (10-3) decay mode – top loopBut trigger is goodLarge backgrounds of γγ, γ-jet and jet jet

Jet rejection 103 requiredNeed energy and angle resolution in calorimeter

Primary vertex!CMS resolution 0.5GeV best

Production mechanism may improve s/b

W.Murray PPD 85

H→ZZ→l+l-l+l-

Golden channel mH>140GeV/c2

Above ~200 two real Z'sGood mass resolution, trigger

Backgrounds:Irreducible QCD ZZ to llllReducible Zbb, tt

Multivariate (pt, η)

methods for low mH

ATLAS toroids help

W.Murray PPD 86

HWW(*)

Important for MH~170 GeV, Higgs mass not fully reconstructed, sensitive to systematics bck• Isolated leptons WW(*)→lνlν (l=e,μ)• Missing transverse energy ET

miss

Background t(Wb)t(Wb)

-Request central jet veto

-WW spin correlations for the signal-small l+l- opening angles

VBF qqH→qqWWPresence of forward jets allows

purer signalmost low-mass range accessible

ATL-PHYS-2003-005

W.Murray PPD 87

SM Discovery

With 30 fb-1, more than 7 σ for the whole range A 200GeV Higgs can be found with 2fb-1

W.Murray PPD 88

Measuring the Higgs mass

MSSM Higgs ∆m/m (%)h, A, H → γγ 0.1−0.4H → 4l 0.1−0.4H/A → µµ 0.1-1.5h → bb 1−2Η → hh → bb γγ 1-2Α → Zh → bbll 1−2H/A → ττ 1-10

precision of <0.3% for mH < 400 GeVno theoretical error included

W.Murray PPD 89

Branching ratio information

3 channels for almost all mH<200GeV

Comparison of rates gives coupling info.e.g. glue/W rate to 25%Hard to measure better than 10%Quark couplings rarely accessible (ttH, H to bb)

WH W→ γγ

WH WWW→

qqH qqWW→

qqH qq→ ττ

H WW→

H ZZ llll→ →

H →γγ

ttH

100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250

Channels with four sigma for 30fb-1

W.Murray PPD 90

Higgs Total Width

Width:Above 200GeV large width can be measuredBelow there is no possibility

ILC can do better

A muon collider would be very useful here

W.Murray PPD 91

Higgs Spin/Parity

Spin? Parity?ZZ and maybe ttH allow parity reconstruction

Spin 0 established if VVH seen – should be for all masses

W.Murray PPD 92

LHC Higgs

Extended Higgs sectors ????

NobelPrize:PeterHiggs

LHC can definitively test the SM Higgs sector

This model is falsifiable! Mass measurements to per cent levelCross section x Branching ratio 10's percentSelf coupling probably not addressable

W.Murray PPD 93

Extended Higgs sectors?

All previous discussion relates to simplest model; one Higgs doubletMany more complex possibilities fit EW dataSUSY is an obvious example

Requires two doubletsCan accommodate more complex possibilities

W.Murray PPD 94

Supersymmetry

EW fit result favours SUSY region:

Heavy SUSYSUSY has two Higgs doublets

5 HiggsesTwo parameters:

MA, tanβ

[ ]

222

2222

22222222

,

0

0 2cos421

+=

+=+⇒

−+±+=

WAH

ZAHh

ZAZAZAhH

MMM

MMMM

MMMMMMM Including Run II CDF M

W

W.Murray PPD 95

LEP SUSY Higgs limit:

LEP limits in Mh

max

Reduced Mtop

extends tanβ exclusion

Tanβ > ~2.5 for 174

Benchmark – not absolute limit. Reduced by:

CPV scenariosnMSSM modelsInvisible decays

179GeV Mtop

W.Murray PPD 96

e.g. CPX Scenario at LEP

Designed to have h/H/A mixing

MSUSY

500GeVM

2 200GeV

μ 2000GeVm

g1000GeV

arg(A) 90o

No mass limits for moderate tanβ

Hard at LHC too

W.Murray PPD 97

TeVatron MSSM reach

TeVatron currently sensitive to modes with enhanced couplings (w.r.t. SM)tanβ in

Bbφ→bbbbφ→ττ

Therefore large tanβ and moderate mass

W.Murray PPD 98

Other MSSM searches: γγγ

Fermio-phobic HiggsD0, 0.83fb-1

No sign of signalExclude fermio-phobic Higgs below 66GeV if H+ mass 100GeV

W.Murray PPD 99

LHC expectations:

H/A similar shape to TeVatronBut hugely expandedHH can be found for most of plot

But not all CPV scenarios all Higgs may escape

W.Murray PPD 100

Conclusions

Incredible new results from Tevatronm

W precision improving

Higgs mass below 150GeV seems clearDirect Higgs searches close to sensitive

LHC will start this yearThere is a real race happening

Do NOTNOT assume the unknown is trueBut in 2010 electroweak symmetry breaking of the SM will be established – or clearly wrong

A lepton collider will be required to explore properties