Search for neutral MSSM Higgs bosons at LEP

Creators: Schael, S.; Favara, A.; Gataullin, M.; Newman, H.; Shevchenko, S.; Shvorob, A.; Xia, L.; Zhu, R. Y.; ALEPH Collaboration; DELPHI Collaboration; L3 Collaboration; OPAL Collaboration

Abstract

The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for the neutral Higgs bosons which are predicted by the Minimal Supersymmetric standard model (MSSM). The data of the four collaborations are statistically combined and examined for their consistency with the background hypothesis and with a possible Higgs boson signal. The combined LEP data show no significant excess of events which would indicate the production of Higgs bosons. The search results are used to set upper bounds on the cross-sections of various Higgs-like event topologies. The results are interpreted within the MSSM in a number of "benchmark" models, including CP-conserving and CP-violating scenarios. These interpretations lead in all cases to large exclusions in the MSSM parameter space. Absolute limits are set on the parameter cosβ and, in some scenarios, on the masses of neutral Higgs bosons.

Additional Information

© 2006 Springer-Verlag. Published in cooperation with EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0. Received: 17 January 2006; Revised version: 12 April 2006; Published online: 18 July 2006. The LEP Working Group for Higgs Boson Searches consists of members of the four LEP Collaborations and of theorists among whom S. Heinemeyer, A. Pilaftsis and G. Weiglein are authors of this paper. Supported by the Leverhulme Trust. Research Fellow of the Belgium FNRS. Supported by the Federal Office for Scientific, Technical and Cultural Affairs through the Interuniversity Attraction Pole P5/27. Research Associate of the Belgium FNRS. Also supported by CONICET and Universidad Nacional de La Plata, CC 67, 1900 La Plata, Argentina. Also supported by the Hungarian OTKA fund under contract number T026178. Supported by Interuniversity Attraction Poles Programme – Belgian Science Policy. Supported by CICYT, Spain. Supported by the National Science Foundation of China. Supported by the Danish Natural Science Research Council. Supported by the UK Particle Physics and Astronomy Research Council. Supported by the US Department of Energy, grant DE-FG0295- ER40896. Supported by the Austrian Ministry for Science and Transport. Supported by Bundesministerium für Bildung und Forschung, Germany. Supported by the Direction des Sciences de la Matière, C.E.A. Supported by the US Department of Energy, grant DE-FG03- 92ER40689. Supported by the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie. Supported by the National Natural Science Foundation of China. Supported by the Hungarian OTKA fund under contract numbers T019181, F023259 and T037350. Supported also by the Comisión Interministerial de Ciencia y Tecnología. We congratulate the LEP Accelerator Division for the successful running of LEP over twelve years, up to the highest energies. We also would like to express our thanks to the engineers and technicians in all our institutions for their contributions to the excellent performance of the four LEP experiments.

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