1 Hunting for the Higgs at LHC Konstantin Goulianos RU HOL FORUM October 6, 2011 The key to mass?

2 M  g = 0 M W, Z ~100 m p M top ~M gold About the Higgs The Standard Model (SM) (Glashow, Salam and Weinberg – 1979 Nobel prize) In the SM all particles have zero mass The Higgs field is needed to renormalize the theory  “generates” mass – but not its own mass Symmetry: SU3XSU2XU1 H WS SM u d u M w and M Z

3 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.

4 M  g = 0 M W, Z ~100 m p M top ~M gold The SM & RU Fermilab 1995 CERN 1970s BNL 1962 (my PhD thesis at Columbia) BNL 1981  p    p evidence for Z Evidence for quarks Z discovered at CERN in 1983 predict charm in 1979 – Glashaw, Iliopoulos (RU), Miani H What are we doing now in the search for the Higgs?

5  -particles Source  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 1985LHC 2010 CDF D0

6 T. Virdee, ICHEP08 6 The Larhe Hadron Collider Lake Geneva Large Hadron Collider 27 km circumference Large Hadron Collider 27 km circumference CMS ATLAS LHCb ALICE CERN ATLAS

7 Collisions at LHC search down to 1 part in 10 13

8 H   H      H  bb (displaced vertex) H  W + W - H  Z 0 Z 0 (Z 0  e+e - /    ) e e   Higgs searches at CMS - I H  ZZ leplon let

9 Higgs searches at CMS -II

10 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???

11 Exclusive Higgs Production H POMERONPOMERON Phys. Rev. D 77, beam p’ roman pots dipole beam p+pp'+H+p'p+pp'+H+p' H

12 Higgs discovery limits Tevatron range With 5fb-1 & combination of CMS+ATLAS data the SM Higgs exclusion reach is in the range140<M H <600GeV  The non-discovery of the SM Higgs will be an even bigger discovery!

13 The Lab Anwar Luc Stefano Michele Mary Koji Christina Andrea Ken HOL talk in (student) Robert Jim Sarah  Vadim and Joe  (machine shop)

14 Backup

15 Accelerator and CR experiments  M 2 12 ~ 7.9x10 -5 eV 2. From cosmology: CMB and large scale structure experiments  Σ =0.03<m1+m2+m3.<0.05eV Neutrino mass hierarchy problem

16 OPERA - 1

17 OPERA – 2

18 The CDF

19 Threading the MiniPlug fibers About 1500 wavelength shifting fibers of 1 mm dia. are ‘strung’ through holes drilled in 36x¼” lead plates sandwiched between reflective Al sheets and guided into bunches to be viewed individually by multi-channel photomultipliers.

20 History of the Universe

21 Blow-hole at Grand Cayman

22 p-p Interactions Diffractive: Colorless exchange with vacuum quantum numbers Non-diffractive: Color-exchange Incident hadrons retain their quantum numbers remaining colorless pseudo- DECONFINEMENT Incident hadrons acquire color and break apart CONFINEMENT POMERONPOMERON Goal: understand the QCD nature of the diffractive exchange rapidity gap

23 Dark Energy P(  y) is exponentially suppressed Rapidity gaps are formed by multiplicity fluctuations: Non-diffractive interactions Rapidity gaps at t=0 grow with  y: Diffractive interactions 2  : negative particle density! Gravitational repulsion ?

24 Grant Unification