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Search for the standard model Higgs boson decaying into two photons in pp collisions at √s=7 TeV

By CMS Collaboration, Serguei Chatrchyan, L. Bäni, Pierluigi Bortignon, Marco A. Buchmann, Bruno Casal, Nicolas Chanon, Zhiling Chen, Amanda Deisher, Günther Dissertori, Michael Dittmar, Marc Dünser, Jürg J. Eugster, Klaus Freudenreich, Christoph Grab, Pierre Lecomte, Werner Lustermann, Pablo Martinez Ruiz del Arbol, Niklas Mohr, Filip Moortgat, Christoph Nägeli, Pascal Nef, Francesca Nessi-Tedaldi, Luc C.M. Pape, Felicitas Pauss, Marco Peruzzi, Frédéric J. Ronga, Marco Rossini, Leonardo Sala, Ann-Karin Sanchez, Marie-Christine Sawley, Andrey Starodumov, Benjamin Stieger, Maiko Takahashi, Ludwig Tauscher, Alessandro Thea, Konstantinos Theofilatos, Daniel Treille, Christina Urscheler, Rainer Wallny, H.A. Weber, Lukas Wehrli, Joanna Weng and et al.

Abstract

A search for a Higgs boson decaying into two photons is described. The analysis is performed using a dataset recorded by the CMS experiment at the LHC from pp collisions at a center-of-mass energy of 7 TeV, which corresponds to an integrated luminosity of 4.8 fb−1. Limits are set on the cross section of the standard model Higgs boson decaying to two photons. The expected exclusion limit at 95% confidence level is between 1.4 and 2.4 times the standard model cross section in the mass range between 110 and 150 GeV. The analysis of the data excludes, at 95% confidence level, the standard model Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The largest excess of events above the expected standard model background is observed for a Higgs boson mass hypothesis of 124 GeV with a local significance of 3.1σ. The global significance of observing an excess with a local significance anywhere in the search range 110–150 GeV is estimated to be 1.8σ. More data are required to ascertain the origin of this excess.ISSN:0370-2693ISSN:0031-9163ISSN:1873-244

Topics: CMS; Physics; Higgs
Publisher: 'Elsevier BV'
Year: 2012
DOI identifier: 10.1016/j.physletb.2012.03.003
OAI identifier: oai:www.research-collection.ethz.ch:20.500.11850/48666
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