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- W1991232372 abstract "We test the possibility that the newly-discovered 126 GeV boson is a pseudoscalar by examining the correlations among the loop-induced pseudoscalar decay branching fractions to $gammagamma$, $ZZ^*$, $Zgamma$, and $WW^*$ final states in a model-independent way. These four decays are controlled by only two effective operators, so that the rates in $Zgamma$ and $WW^*$ are predicted now that the rates in $gammagamma$ and $ZZ^*,Zgamma^* to 4 ell$ have been measured. We find that the pseudoscalar possibility is disfavored but not conclusively excluded. Experimental exclusion of the $Zgamma$ decay to well below $sigma/sigma_{rm SM} sim 170$ or conclusive observation of the $WW^*$ decay near the Standard Model rate would eliminate the pseudoscalar possibility. The $Zgamma$ exclusion should be possible using existing data. The only loophole in our argument is the possibility that the $4ell$ signal comes from pseudoscalar decays to a pair of new neutral gauge bosons with mass near the $Z$ pole." @default.
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- W1991232372 date "2012-10-16" @default.
- W1991232372 modified "2023-09-24" @default.
- W1991232372 title "Can the 126 GeV boson be a pseudoscalar?" @default.
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- W1991232372 doi "https://doi.org/10.1103/physrevd.86.075022" @default.
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