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Hunting for the Higgs at LHC

Konstantin GoulianosRU HOL FORUM October 6, 2011

The key to mass?

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Mg = 0 MW, Z~100 mp Mtop~Mgold

About the HiggsThe Standard Model (SM)

(Glashow, Salam and Weinberg – 1979 Nobel prize)

In the SM all particles have zero massThe Higgs field is needed to renormalize the theory “generates” mass – but not its own mass

Symmetry:

SU3XSU2XU1

H

WS

SM

udu

Mw and MZ

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Higgs mechanism

solves mass hierarchy problem

Higgs:renormalizes the theory (removes infinities) one neutral Higgs boson “generates” the quark masses

by coupling to quarks ~ mass.

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Mg = 0 MW, Z~100 mp

Mtop~Mgold

The SM & RU

Fermilab1995

CERN1970s

BNL 1962(my PhD thesisat Columbia)

BNL 1981

p pevidence for Z

Evidencefor quarks

Z discovered atCERN in 1983

predict charm in 1979 – Glashaw, Iliopoulos (RU) , Miani

H

What are we doing now in the search for the Higgs?

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-particlesSource

Rutherford Experiment

Large angle scattering atoms have nuclei

Particle accelerators

27 km tunnel 7 TeV4 mile (6.4 km) tunnel 2 TeV

1910

Fermilab Tevatron 1985 LHC 2010

CDFD0

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T. Virdee, ICHEP08 6

The Larhe Hadron ColliderLake GenevaLake GenevaLarge Large HadronHadron Collider Collider27 km circumference27 km circumference

Large Large HadronHadron Collider Collider27 km circumference27 km circumference

CMSCMS

ATLASATLAS

LHCbLHCb

ALICEALICE

CERNCERN

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Collisions at LHC

search down to 1 part in 1013

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H

H

Hbb (displaced vertex)

HW+W-

HZ0Z0 (Z0e+e- /)

ee

Higgs searches at CMS - I

HZZ

leplonleplon

let

let

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Higgs searches at CMS -II

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Super-symmetry (SUSY)

The SM is not stable at high energies because of loop corrections

SUSY renormalizes the SM by introducing opposite sign contributions

The lightest SUSY particle (LSP) escapes detection

candidate for dark matter

…but what about dark energy???

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Exclusive Higgs Production

H

POMERON

Phys. Rev. D 77, 052004

MeV21~δMTOF

δp2~M

10~M

m~/gg)qRate(q

Higgsidentifiesstate

oJ

72

2q

_

z

0

beam

p’

p’roman pots roman pots

dipole

dipole

beam

p+pp'+H+p'

H

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Higgs discovery limits

Tevatronrange

With 5fb-1 & combination of CMS+ATLAS data the SM Higgs exclusion reach is in the range140<MH<600GeVThe non-discovery of the SM Higgs will be an even bigger discovery!

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The Lab

Anwar Luc Stefano Michele Mary Koji Christina Andrea Ken

HOL talk in 2004

2011(student)

Robert Jim Sarah

Vadim and Joe (machine shop)

http://physics.rockefeller.edu/

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Backup

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Accelerator and CR experiments M212 ~ 7.9x10-5 eV2.

From cosmology:CMB and large scale structure experiments Σ =0.03<m1+m2+m3.<0.05eV

Neutrino mass hierarchy problem

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OPERA - 1

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OPERA – 2

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The MiniPlugs @ CDF

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Threading the MiniPlug fibers

About 1500 wavelength shifting fibers of 1 mm dia. are ‘strung’ through holesdrilled in 36x¼” lead plates sandwiched between reflective Al sheets and guided

into bunches to be viewed individually by multi-channel photomultipliers.

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History of the Universe

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Blow-hole at Grand Cayman

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p-p InteractionsDiffractive:

Colorless exchange with vacuum quantum numbers

Non-diffractive:Color-exchange

Incident hadrons retain their quantum numbersremaining colorless

pseudo-DECONFINEMENT

Incident hadrons acquire colorand break apart

CONFINEMENT

POMERON

Goal: understand the QCD nature of the diffractive exchange

rapidity gap

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Dark Energy

P(y) is exponentially suppressed

dy

dNρ,ey)P( particlesΔyρ

Rapidity gaps are formed bymultiplicity fluctuations:

Non-diffractive interactions

Δy2εe~0ty)P(

2lnlnln Msy

Rapidity gaps at t=0 grow with y:

Diffractive interactions

2: negative particle density!

Gravitational repulsion?http://physics.rockefeller.edu/dino/myhtml/talks/goulianos_konstantin_eds09_discussion.pdf

http://physics.rockefeller.edu/dino/myhtml/conference.html

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Grant Unification