https://doi.org/10.1007/BF01245796
Search for a massive Di-photon resonance at ∝s = 91 – 172 GeV
15
School of Physics and Space Research, University of Birmingham, B15 2TT, Birmingham, UK
7
Dipartimento di Fisica dell' University di Bologna and INFN, I-40126, Bologna, Italy
13
Physikalisches Institut, Universität Bonn, D-53115, Bonn, Germany
23
Department of Physics, University of California, 92521, Riverside, CA, USA
4
Cavendish Laboratory, C133 OHE, Cambridge, UK
21
Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, KIS 5136, Ottawa, Ontario, Canada
28
Centre for Research in Particle Physics, Carleton University, KIS 5136, Ottawa, Ontario, Canada
1
European Organisation for Particle Physics, CERN, CH-1211, Geneva 23, Switzerland
5
Enrico Fermi Institute and Department of Physics, University of Chicago, 60637, Chicago, IL, USA
18
Fakultät für Physik, Albert Ludwigs Universität, D-79104, Freiburg, Germany
19
Physikalisches Institut, Universität Heidelberg, D-69120, Heidelberg, Germany
6
Department of Physics, Indiana University, Swain Hall West 117, 47405, Bloomington, IN, USA
22
Queen Mary and Westfield College, University of London, El 4NS, London, UK
14
Technische Hochschule Aachen, III Physikalisches Institut, Sommerfeldstrasse 26-28, D-52056, Aachen, Germany
24
University College London, WCIE 613T, London, UK
3
Department of Physics, Schuster Laboratory, The University, M13 9PL, Manchester, UK
12
Department of Physics, University of Maryland, 20742, College Park, MD, USA
11
Laboratoire de Physique Nucléaire, University de Montreal, H3C 3J7, Montreal, Quebec, Canada
33
Department of Physics, University of Oregon, 97403, Eugene, OR, USA
16
Rutherford Appleton Laboratory, OX11 OQX, Chilton, Didcot, Oxfordshire, UK
25
Department of Physics, Technion-Israel Institute of Technology, 32000, Haifa, Israel
2
Department of Physics and Astronomy, Tel Aviv University, 69978, Tel Aviv, Israel
8
International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo, 113, Tokyo, Japan
9
Kobe University, 657, Kobe, Japan
31
Brunel University, U138 3PH, Uxbridge, Middlesex, UK
29
Particle Physics Department, Weizmann Institute of Science, 76100, Rehovot, Israel
17
II Institut fur Experimental Physik, Universität Hamburg/DESY, Notkestrasse 85, D-22607, Hamburg, Germany
32
Department of Physics, University of Victoria, P O Box 3055, V8W 3P6, Victoria, BC, Canada
10
University of British Columbia, Department of Physics, V6T 1Z1, Vancouver, BC, Canada
26
Department of Physics, University of Alberta, T6G 2J1, Edmonton, AB, Canada
34
Dept of Physics, Duke University, 27708-0305, Durham, NC, USA
30
Research Institute for Particle and Nuclear Physics, P O Box 49, H-1525, Budapest, Hungary
27
Institute of Nuclear Research, P O Box 51, H-4001, Debrecen, Hungary
20
Sektion Physik, Ludwigs-Maximilians-Universitat München, Am Coulombwall 1, D-85748, Garching, Germany
Received:
2
September
1997
Published online:
27
February
2005
A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a total data sample of 25.7 pb−1 taken at centre-of-mass energies between 130 GeV and 172 GeV with the OPAL detector at LEP. The observed number of events is consistent with the expected number from Standard Model processes. The observed candidates are combined with search results from ∝s ≈ Mz to place limits onB(H0 → γγ within the Standard Model for Higgs boson masses up to 77 GeV, and on the production cross section of any scalar resonance decaying into di-photons. Upper limits onB(H0 →4 γγ x σ(e+e− → H°Z°) of 290 – 830 fb are obtained over 40 <M H < 160 GeV. Higgs scalars which couple only to gauge bosons with Standard Model strength are ruled out up to a mass of 76.5 GeV at the 95% confidence level.
© Springer-Verlag, 1998
