Final Systematics for the WH analysis

Jorge Troconiz, U/ of Madrid

Jorge presented the final numbers for the search for a scalar Higgs decaying into b\bar b produced in association with a vector boson that decays hadronically

$p\bar p\rightarrow W/Z H \rightarrow (q\bar q) (b\bar b) $

This analysis is complementary to the search for the same production process followed by a leptonic decay of the W (paper already sumbitted to PRL), where

$p\bar p\rightarrow W/Z H \rightarrow (q\bar q) (b\bar b) $

The analysis by Jorge and his group is going trough the final stages of the godparenting process and the first PRL draft will be out soon to the collaboration. The table shown is this:

Comments:

• Dave Stuart asked for clarifications about the evaluation of the systematic after the fit (see for instance how a 40% systematic on the totel efficiency for M_H=110 GeV/c² translates to a 27% total on the cross section after the fit). The fact is that the systematic uncertainties on the cross section evaluated from the fit are obtained as the fluctuation of the fit result itself using as input the acceptance value fluctuated up and down by it total uncertainty.In simple words if the fit has a broad minimum, its stability make less crucial the effect of the systematic of the efficiency on the overall result. In this particular case the stability is given also by the fact that for all the mass value above 80 GeV the fit prefers the solution with no signal. For a better description of the procedures for the evaluation of systematics see CDF Note 4129 and 4131.
• (After the meeting) the group has also been requested to add the systematic uncertainty due to the PDF's. This contribution has a totally negligible effect on the 95% CL but has been added for the sake of completeness.The modified table will apper in a update of CDF Note 4129.

The result was blessed!