Constraints on models for the Higgs boson with exotic spin and parity in VH→Vbb¯ final states
Résumé
We present the first constraints on the spin $J$ and parity $P$ of the Higgs boson, $H$, decaying to two $b$ quarks in up to 9.7~\infb\ of $p\bar{p}$ collisions at $\sqrt{s} = $ 1.96~TeV collected with the D0 detector at the Fermilab Tevatron Collider. In the \zhl, \whl, and \zhv\ final states, we compare the standard model (SM) Higgs boson hypothesis, \jpzp, with two alternative hypotheses, \jpzm\ and \jptp. We use a likelihood ratio to quantify the level of preference in data for the \jpzp\ prediction. We reject the \jpzm\ and \jptp\ hypotheses at the 97.6\%\ CL and at the 99.0\%\ CL, respectively, assuming that the product of the signal production cross section and the branching fraction into $b\bar{b}$ is equal to the SM prediction. The expected exclusion sensitivity for a \jpzm\ (\jptp) state is at the 99.86\%\ (99.94\%) CL. For completeness, other production rates are also considered. When considering the hypothesis that our data is the result of a combination of the SM-like Higgs boson and either a \jpzm\ or a \jptp\ signal, we exclude a \jpzm\ fraction above 0.80 and a \jptp\ fraction above 0.67 at the 95\%\ CL. The expected exclusion covers \jpzm\ (\jptp) fractions above 0.54 (0.47).
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