Prior to the Higgs boson discovery, in 2012, there was essentially one last, reasonably plausible way that the Higgs could have been missed at the Large Electron-Positron (LEP) collider, by decaying into four tau leptons via an intermediate pseudoscalar particle (like the a0 in the NMSSM, for example). So in 2009 we revisited data collected by the ALEPH experiment, at LEP, to look in this decay channel. Our paper is here:
J. Beacham, K. Cranmer, P. Spagnolo, I. Yavin, on behalf of the ALEPH Collaboration:
"Search for neutral Higgs bosons decaying into four taus at LEP2", March 2010Talk:
La Thuile, Italy, March 2010: Rencontres de Moriond, QCD and High Energy Interactions. [slides]
Poster (contributed):
Paris, July 2010: 35th International Conference on High Energy Physics. [listing] [poster]