Search for neutral Higgs bosons in e+ e- collisions at S**(1/2) approximately equals 189-GeV

A search for neutral Higgs bosons has been performed with the OPAL detector at LEP, using approximately 170 pb-1 of e+e- collision data collected at sqrt(s)~189GeV. Searches have been performed for the Standard Model (SM) process e+e- to H0Z0 and the MSSM processes e+e- to H0Z0, A0h0. The searches are sensitive to the b b-bar and tau antitau decay modes of the Higgs bosons, and also to the MSSM decay mode h0 to A0A0. OPAL search results at lower centre-of-mass energies have been incorporated in the limits we set, which are valid at the 95% confidence level. For the SM Higgs boson, we obtain a lower mass bound of 91.0 GeV. In the MSSM, our limits are mh>74.8GeV and mA>76.5GeV, assuming tan(beta)>1, that the mixing of the scalar top quarks is either zero or maximal, and that the soft SUSY-breaking masses are 1 TeV. For the case of zero scalar top mixing, we exclude values of tan(beta) between 0.72 and 2.19.

Note:

38 pages, 15 figures, submitted Euro. Phys. J. C Report-no: CERN-EP/99-096

electron positron: colliding beams
electron positron: annihilation
Higgs particle: search for
Higgs particle: neutral particle
Higgs particle: electroproduction
Z0: associated production
Higgs particle: pair production
supersymmetry
Higgs particle: decay modes
Higgs particle: mass

References(61)

Figures(0)

Broken symmetries, massless particles and gauge fields

Peter W. Higgs
(
- Edinburgh U.
)

- Phys.Lett. 12 (1964) 132-133,
- Also in *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 125-126
•
DOI:
- 10.1016/0031-9163(64)91136-9

Broken Symmetry and the Mass of Gauge Vector Mesons

F. Englert
(
- Brussels U.
)
,
R. Brout
(
- Brussels U.
)

- Phys.Rev.Lett. 13 (1964) 321-323,
- Also in *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 127-129,
•
DOI:
- 10.1103/PhysRevLett.13.321

Global Conservation Laws and Massless Particles

G.S. Guralnik
(
- Imperial Coll., London
)
,
C.R. Hagen
(
- Imperial Coll., London
)
,
T.W.B. Kibble
(
- Imperial Coll., London
)

- Phys.Rev.Lett. 13 (1964) 585-587,
- Also in *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 130-132,
•
DOI:
- 10.1103/PhysRevLett.13.585

Weak Interactions with Lepton-Hadron Symmetry

- Phys.Rev.D 2 (1970) 1285-1292,
- Also in *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 203-210,
- In *Rosner, J.L. (ed.): New Particles*, 18-25,
- In *Lichtenberg, D. B. (Ed.), Rosen, S. P. (Ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 193-200.,
- In *Bologna 1984, Proceedings, Fifty Years of Weak-Interaction Physics* 687-694
•
DOI:
- 10.1103/PhysRevD.2.1285

A Model of Leptons

Steven Weinberg
(
- MIT, LNS
)

- Phys.Rev.Lett. 19 (1967) 1264-1266,
- Also in *Lichtenberg, D. B. (ed.), Rosen, S. P. (ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 157-159,
- In *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 185-187,
- In *Rosner, J. L. (ed.): New Particles*, 26-28
•
DOI:
- 10.1103/PhysRevLett.19.1264

Weak and Electromagnetic Interactions

Abdus Salam
(
- Imperial Coll., London and
- ICTP, Trieste
)

- Conf.Proc.C 680519 (1968) 367-377,
- Reprinted in *Lichtenberg, D. B. (ed.), Rosen, S. P. (ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 160-170, and in *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 188-198,
- Also in *Rosner, J.L. (ed.): New particles* 29-39,
- Also in *Ali, A. (ed.) et al.: Selected papers of Abdus Salam* 244-254
•
DOI:
- 10.1142/9789812795915_0034

Supersymmetry, Supergravity and Particle Physics

Hans Peter Nilles
(
- Geneva U. and
- CERN
)

- Phys.Rept. 110 (1984) 1-162
•
DOI:
- 10.1016/0370-1573(84)90008-5

The Search for Supersymmetry: Probing Physics Beyond the Standard Model

Howard E. Haber
(
- UC, Santa Cruz and
- SLAC
)
,
Gordon L. Kane
(
- Michigan U.
)

- Phys.Rept. 117 (1985) 75-263
•
DOI:
- 10.1016/0370-1573(85)90051-1

On the Possibility of Finding Light Uncolored Supersymmetric Partners at Present and Future Machines

J.M. Frere
(
- Michigan U.
)
,
Gordon L. Kane
(
- Michigan U.
)

- Nucl.Phys.B 223 (1983) 331-350
•
DOI:
- 10.1016/0550-3213(83)90059-7

Search for Neutral Gauge Fermions in $e^+ e^-$ Annihilation

- Phys.Lett.B 132 (1983) 436-442
•
DOI:
- 10.1016/0370-2693(83)90343-X

Search for Supersymmetry at the anti-p p Collider

- Phys.Lett.B 127 (1983) 233-241
•
DOI:
- 10.1016/0370-2693(83)90883-3

Search for Higgs bosons in $e^{+} e^{-}$ collisions at 183-GeV

OPAL

Collaboration

•

G. Abbiendi

et al.

- Eur.Phys.J.C 7 (1999) 407-435
•
e-Print:
- hep-ex/9811025
•
DOI:
- 10.1007/s100529901102

Search for the standard model higgs boson in e+ e- collisions at s**(1/2) = 161-GeV - 172-GeV

OPAL

Collaboration

•

K. Ackerstaff

et al.

- Eur.Phys.J.C 1 (1998) 425-438
•
e-Print:
- hep-ex/9709003
•
DOI:
- 10.1007/s100520050094

A Search for neutral Higgs bosons in the MSSM and models with two scalar field doublets

OPAL

Collaboration

•

K. Ackerstaff

et al.

- Eur.Phys.J.C 5 (1998) 19-40
•
e-Print:
- hep-ex/9803019
•
DOI:
- 10.1007/s100520050245

Search for the standard model Higgs boson at the LEP-2 collider near S**(1/2) = 183-GeV

ALEPH

Collaboration

•

R. Barate
(
- Annecy, LAPP
)

et al.

- Phys.Lett.B 440 (1998) 403-418,
- Phys.Lett.B 447 (1999) 336-351
•
e-Print:
- hep-ex/9811032
•
DOI:
- 10.1016/S0370-2693(98)01239-8

Searches for the neutral Higgs bosons of the MSSM in $e^+e^-$ collisions at center-of-mass energies of 181-GeV to 184-GeV

ALEPH

Collaboration

•

R. Barate
(
- Annecy, LAPP
)

et al.

- Phys.Lett.B 440 (1998) 419-434,
- Phys.Lett.B 447 (1999) 355-355 (erratum)
•
DOI:
- 10.1016/S0370-2693(98)01240-4

Search for the standard model Higgs boson in e+ e- interactions at S**(1/2) = 183-GeV

L3

Collaboration

•

M. Acciarri

et al.

- Phys.Lett.B 431 (1998) 437-450
•
DOI:
- 10.1016/S0370-2693(98)00568-1

Search for neutral Higgs bosons of the minimal supersymmetric standard model in $e^{+} e^{-}$ interactions at $\sqrt{s}$ = 130-GeV - 183-GeV

L3

Collaboration

•

M. Acciarri

et al.

- Phys.Lett.B 436 (1998) 389-402
•
DOI:
- 10.1016/S0370-2693(98)01002-8

The OPAL detector at LEP

OPAL

Collaboration

•

K. Ahmet

et al.

- Nucl.Instrum.Meth.A 305 (1991) 275-319
•
DOI:
- 10.1016/0168-9002(91)90547-4

The extended OPAL silicon strip microvertex detector

OPAL

Collaboration

•

S. Anderson
(
- Indiana U.
)

et al.

- Nucl.Instrum.Meth.A 403 (1998) 326-350
•
DOI:
- 10.1016/S0168-9002(97)01093-0

The OPAL silicon - tungsten calorimeter front end electronics

OPAL

Collaboration

•

B.E. Anderson

et al.

- IEEE Trans.Nucl.Sci. 41 (1994) 845-852
•
DOI:
- 10.1109/23.322818

Production of fermion pair events in e+ e- collisions at 161-GeV center-of-mass energy

OPAL

Collaboration

•

K. Ackerstaff

et al.

- Phys.Lett.B 391 (1997) 221-234
•
DOI:
- 10.1016/S0370-2693(97)81627-9

Search for the minimal Standard Model Higgs boson

OPAL

Collaboration

•

R. Akers

et al.

- Phys.Lett.B 327 (1994) 397-410
•
DOI:
- 10.1016/0370-2693(94)90746-3

Search for chargino and neutralino production at $\sqrt{s}$ = 170-GeV and 172-GeV at LEP

OPAL

Collaboration

•

K. Ackerstaff

et al.

- Eur.Phys.J.C 2 (1998) 213-236
•
e-Print:
- hep-ex/9708018
•
DOI:
- 10.1007/s100520050134

High-energy physics event generation with PYTHIA 5.7 and JETSET 7.4

Torbjorn Sjostrand
(
- CERN
)

- Comput.Phys.Commun. 82 (1994) 74-90,
- CERN Geneva - TH. 7111 (93/12,rec.Jan.94) 17 p. and e: CERN th-7111-93
•
DOI:
- 10.1016/0010-4655(94)90132-5

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