OPTIMISATION OF THE CUTS

Based on opt. MC samples (WPHACT: hee (h --> b b~) with 80 GeV mass for signal and eeqq~ for background)

No use of automatic methods: previously used cuts (Sept. meeting) nearly ok, some improvement in eff. with minor increase of bg moving smaller isol. cut from 8 to 4 degrees

CUT

DEFINITION

1

El. ident.

2

2nd jet mult>1

3

Pcomb(fit)>1.E-20%

4

Isjmin>4,Isjmax>15

5

Fast el. en.>40 GeV

6

Fitted Mrec>50 GeV

7

min(probp,probs)<0.3

See eff. vs bg. plot varying the btag cut

Data-MC comparison plots at 183 GeV. Plots at the left show data (err.bars), total b.g. (black line) and qq~ contribution (blue); at the right Higgs MC of 80 GeV (black line: preselection, yellow: final cut)

tables