Journal
PHYSICAL REVIEW D
Volume 86, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.86.075022
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Funding
- Natural Sciences and Engineering Research Council of Canada
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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 gamma gamma, ZZ*, Z gamma, and WW* final states in a model-independent way. These four decays are controlled by only two effective operators, so that the rates in Z gamma and WW* are predicted now that the rates in gamma gamma and ZZ*, Z gamma* -> 4l have been measured. We find that the pseudoscalar possibility is disfavored but not conclusively excluded. Experimental exclusion of the Z gamma decay to well below sigma/sigma(SM) similar to 170 or conclusive observation of the WW* decay near the Standard Model rate would eliminate the pseudoscalar possibility. The Z gamma exclusion should be possible using existing data. The only loophole in our argument is the possibility that the 4l signal comes from pseudoscalar decays to a pair of new neutral gauge bosons with mass near the Z pole.
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