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A class of potential backgrounds for Higgs boson searches in the W W todi-lepton channel at both the Tevatron and Large Hadron Collider is presented.Backgrounds from W photon production with external conversion of the on-shellphoton in detector material to an asymmetric electron-positron pair, with lossof the trailing electron or positron has been treated adequately in Higgssearches. Here we consider analogous backgrounds from the production of a Wwith an off-shell photon and with the internal conversion of the off-shellphoton in vacuum to an asymmetric lepton-anti-lepton pair. While the formerprocess yields almost entirely electrons or positrons, the latter can giveelectron, positron, muon, and anti-muon backgrounds in roughly equal amounts.We estimate that asymmetric internal conversion backgrounds are comparable tothe Higgs boson signal in the standard signal region of phase space. Theseprocesses also represent potential backgrounds for new physics searches insame-sign di-lepton channels. Some data driven methods to characterizeasymmetric internal conversion backgrounds are suggested.

Backgrounds To Higgs Boson Searches from Asymmetric Internal Conversion