1. Study of Hb`b, c`c and gg in the `H channel
Jianping Dai (SJTU) /07/2015

2. Physics Motivation
To measure the BR of Higgs decay to b, c and gluon in the process of ee−Z(`)H at 250GeV;
The BR of Z(`)H is twice as large as the BR of Z(l`l)H;

3. MC Samples and Cross Sections (fb)
`qq backgrounds
l`lqq backgrounds
l`qq backgrounds

4. MC Samples and Cross Sections (fb)
ZH background: HWW*, ZZ*…
l`ll`l backgrounds
All the samples are from the full simulation;
The signal sample is reconstructed with the newest Arbor, but the backgrounds samples are also used old Arbor;
All the signal and backgrounds are normalized to 5ab-1;
Because of the lack of the sample, the qq background isn’t considered now;

5. MC Samples and Cross Sections

6. ILC: 80<Mmiss<140 GeV/c2;
Missing mass of di-jet
ILC: 80<Mmiss<140 GeV/c2;

7. ILC: 20<PT<70 GeV/c;

8. PL
ILC: |PL|<60 GeV/c;

9. ILC: Pmax(Trk)<30 GeV/c;

10. NChaTrk
ILC: NChaTrk>10;

11. Y23
ILC: Y23<0.02;

12. Y12
ILC: 0.2<Y12<0.8;

13. ILC: 100<Mgg<130 GeV/c2;
Invariant mass of di-jet
ILC: 100<Mgg<130 GeV/c2;

14. Cut Flows Signal `qq lqq Total Events 167948 1405103 16725057
80<Mmiss<140 GeV/c2
147079/0.876
/0.765
/0.245
20<PT<70 GeV/c
134006/0.911
745774/0.694
289580/0.706
|PL|<60 GeV/c
132133/0.986
430203/0.577
/0.798
Pmax(Trk)<30 GeV/c
121688/0.921
347736/0.808
/0.449
NChaTrk>10
121325/0.997
334481/0.962
991871/0.957
Y23<0.02
87895/0.724
260593/0.779
224339/0.226
0.2<Y12<0.8
84148/0.957
194766/0.747
183074/0.816
100<Mgg<130 GeV/c2
74502/0.885
20128/0.103
69059/0.377 
0.4436

15. Cut Flows `H l`lqq llll Total Events 75073 2601000 1079184
80<Mmiss<140 GeV/c2
40996/0.546
349332/0.134
65730/0.0609
20<PT<70 GeV/c
36094/0.880
76212/0.218
467/
|PL|<60 GeV/c
34896/0.967
68096/0.894
325/0.696
Pmax(Trk)<30 GeV/c
26256/0.752
37516/0.551
4/0.0123
NChaTrk>10
25760/0.981
36481/0.972
0/0.0
Y23<0.02
4033/0.157
6093/0.167
0.2<Y12<0.8
3785/0.939
5451/0.895
100<Mgg<130 GeV/c2
2405/0.635
3136/0.575 
0.0

16. ILC results ( v2)

17. If selecting a least lepton (electron or muon), the initial events after passing FSClasser is about 25000, the efficiency will be reduced nearly by 85%;

18. Thanks