The OPAL Higgs Working Group Public Page

The members of the OPAL Higgs Working Group search for direct evidence of Higgs boson production and decay in e+e- collision events at LEP1 and at LEP2. In addition to the search for the single Higgs boson predicted by the Minimal Standard Model, searches are conducted for the Higgs bosons of models with extended Higgs sectors, such as the MSSM and more general models. The OPAL Group for New Particle Searches covers analyses seeking other new particles.

The listbox mailing address of the OPAL Higgs Working Group is opal-higgs-wg@opal-lb.cern.ch.

The organizers of the group are Satoru Yamashita, Pamela Ferrari and Fredrik Akesson.

Search Topics and People

• Standard Model Higgs Boson Searches (Higgsstrahlung+WW/ZZ Fusion processes)

  • Four-Jet Channel Fredrik Akesson, Rob Davis, James Pinfold, Arnulf Quadt, Markus Schumacher
  • Missing-Energy Channel Ehud Duchovni, Eilam Gross, Amit Klier, Michael Kupper
  • Tau Channels Andy Hocker, Richard Teuscher
  • Lepton Channels Isamu Nakamura, Satoru Yamashita

• MSSM Higgs Boson Searches (hA and h to AA)

  • Model Databases Philip Bechtle, Klaus Desch, Arnulf Quadt
  • Four-B Channel Klaus Desch, Arnulf Quadt
  • bb tautau Channel Andy Hocker, Richard Teuscher
  • 6b channel Gail Hanson
  • Low mA Search (h to AA) Pamela Ferrari, Pauline Gagnon

• Charged Higgs Searches

  • Fermionically Decaying Charged Higgses Csaba Hajdu, Dezso Horvath, Tom Marchant Graham Wilson, Terry Wyatt
  • Charged Higgs decays to WA Kara Hoffman, Anna Okpara

• Extended Higgs Sectors

  • Invisibly Decaying Higgs bosons Koichi Nagai
  • Photonically Decaying Higgs bosons (fermiophobic) Mark Oreglia, Markus Schumacher
  • General 2HDM Models Pamela Ferrari, Daniel Zer-Zion
  • Yukawa Searches Fredrik Akesson, Klaus Desch, Michael Kobel
  • Decay-Mode Independent Searches Jochen Cammin, Michael Kobel, Markus Klute
  • Flavour-Independent HZ Searches with hadronically decaying H
    • Four-Jet Channel Jenny Boehme, Goetz Gaycken, Nicole Nesvadba
    • Missing-Energy Channel Ehud Duchovni, Eilam Gross, Amit Klier, Michael Kupper
    • Tau Channels Andy Hocker, Richard Teuscher
    • Lepton Channels Isamu Nakamura, Satoru Yamashita
  • Flavour-independent hA searches with hadronically decaying h, A Christian Couyoumtzelis, Tom Junk

• Confidence Level and Limit Calculations

  • Peter Bock, Tom Junk

• LEP Higgs WG Contacts

  • Peter Igo-Kemenes, Tom Junk

Recent Publications

PR329

Search for the Standard Model Higgs Boson in e+e- Collisions at sqrt(s)=192-209 GeV

The OPAL Collaboration, G. Abbiendi et al.
22nd December 2000
CERN-EP-2000-156, Phys. Lett. B499 (2001) 38-52
Spires record (mirrored in UK, Japan, Germany)
 

PR318

Two Higgs Doublet Model and Model Independent Interpretation of Neutral Higgs Boson Searches

The OPAL Collaboration, G. Abbiendi et al.
7th July 2000
CERN-EP-2000-092, Eur. Phys. J. C18 (2001) 425-445
Spires record (mirrored in UK, Japan, Germany)
 

PR285

Search for Neutral Higgs Bosons in e+e- Collisions at sqrt(s) ~ 189 GeV
The OPAL Collaboration, G. Abbiendi et al.
8th July 1999
CERN-EP/99-096, Eur. Phys. J. C12 (2000) 567-586
Spires record (mirrored in UK, Japan, Germany)
 

PR281

Search for Higgs Boson and Other Massive States Decaying into Two Photons in e+e- Collisions at 189 GeV
The OPAL Collaboration, G. Abbiendi et al.
21st June 1999
CERN-EP/99-084, Phys. Lett. B 464 (1999) 311-322
Spires record (mirrored in UK, Japan, Germany)
 

Recent Physics Notes

PN483 Search for Yukawa Production of a Light Neutral Higgs Boson at LEP

9th July 2001
 

PN475 Two Higgs Doublet Model Interpretation of Neutral higgs Boson Searches up to the Highest LEP Energies

4th July 2001
 

PN472 Searches for Higgs Bosons in Extensions to the Standard Model in e+e- Collisions at the Highest LEP Energies

23rd February 2001
 

Also see the LEP Higgs WG's papers page for results combined with ALEPH, DELPHI and L3.

Some talks given by OPAL Higgs Searchers

Higgs & SUSY 2001 19-22 March, Orsay

• Searches for Higgs Bosons with OPAL at LEP by Fredrik Akesson [ 27 pages 6.8 MB ps.gz ]

Rencontres de Moriond (QCD), Les Arcs, France, 17-24 March 2001

• LEP Higgs Combinations by Anna Okpara [ 24 pages 394 kB ps.gz ]

Les Rencontres de Physique de la Vallee d'Aoste 4-10 March 2001 La Thuile

• Higgs Searches in OPAL by Amit Klier [2.1 MB pdf]

LEPC Meeting of 3 November 2000

• Status of Higgs Boson Searches by Peter Igo-Kemenes [21 pages / 305K PS.gz]
• Results from the OPAL experiment by Arnulf Quadt [16 pages / 502K PS.gz] ;backup slides:[5 pages / 152K PS.gz]

LEP Fest, 9-11 October 2000

• Combined LEP Higgs Searches by Tom Junk [23 pages / 378K PS.gz]

Hadron Structure, High Tatras, Slovakia, 2-8 October 2000

• Higgs Searches at LEP by Pamela Ferrari [ 40 pages / 604K ps.gz]

RADCOR2000, 11-15 September 2000,Carmel, California, USA

• Searches at LEP by Tom Junk [44 pages / 523K PS.gz]

SUSY2k, 26-30 June 2000, CERN

• Searches for Higgs Bosons at LEP by Tom Junk [37 pages / 528K PS.gz]

Moriond Electroweak, March 2000

• MSSM Higgs Searches at LEP2 by Arnulf Quadt [9 pages / 411K ps.gz]

EPS-HEP'99, Tampere, Finland, 15-21 July, 1999

• Other Higgs Boson Searches at LEP

Beyond'99, Rottach-Egern/Tegernsee, Germany, 6-12 June, 1999

• Status and Perspectives of LEP Searches for the Higgs Boson(s) by Christian Couyoumtzelis [20 pages / 474K PS.gz]

DPF 99, UCLA, USA, 5-9 January 1999

• MSSM Higgs Boson Searches at LEP2 by Andy Hocker [18 pages / 290K PS.gz]

Also see the LEP Higgs WG's talks page for talks about combined Higgs results.

Other CERN links of interest

• CERN Welcome
• The OPAL Experiment
• The LEP Higgs Working Group
• The LEP SUSY Working Group