1. γγ->HH Study Report 10.23.2008 Nozomi Maeda Hiroshima Univ.

2. Previous meeting choose Signal(Background) reaction. Cut with some parameter.

3. today ’ s topic ・ About Cut condition and result

4. choose solution solutions are... (H1, H2) = (j1+j2, j3+j4), (H1, H2) = (j1+j3, j2+j4), (H1, H2) = (j1+j4, j2+j3), (H1, H2) = (j3+j4, j1+j2), (H1, H2) = (j2+j4, j1+j3), (H1, H2) = (j2+j3, j1+j4) one solution that has smallest(largest) parameter will be choosen.

5. Cut parameter Number of tracks Reconstructed particle mass(choosen solution) Cos j1-j2(choosen solution) χ 2 (assume Higgs, assume W-boson)

6. distribution

7. Cut condition and result Ntrack > 100 Signal : 1000 -> 340 Background : 1000 -> 10 Mass > 90 Signal : 1000 -> 90 Background : 1000 -> 0 -0.8 < CosTheta < 0 Signal : 1000 -> 69 Background : 1000 -> 0

8. χ 2 2D Plot

10. Cut condition and result x :χ 2 (assume Higgs) y :χ 2 (assume W-boson) condition : y + (250/75)x < 250 Signal : 1000 -> 833 Background : 1000 -> 83

11. next plan optimize Cut condition b-tagging luminosity distribution