Status report on CEPC H at Zhenwei Cui

Status report on CEPC + H->μ +μ at Zhenwei Cui, Qiang Li, Gang Li, Manqi Ruan, Xin Mo, Lei Wang 2016/11/28 1

OUTLINE 1. Introduction 2. Inclusive analysis 3. Exclusive analysis 2

Introduction (Physics at the e +e − Linear Collider Aug. 13 2015) ILC 3

Inclusive analysis Divide the signal(full) equally with random number. . Part A : Find sections. Part B : Get test result Signal : full BKG: fast BKG(fast): 184 4

BKG：second order Chebychev function Signal：CBShape function Significance： 5. 89 Uncertainty： 5

BDT: Ptsum, abs(Pzsum), cosum, cosup, Ptuu Max Significance: 6. 00 at bdt=0. 01 6

Exclusive: Signal and BKG Event generator: generator WHIZARD 1. 95 Detector simulation: simulation MOKKA(cepc_v 1 model) Particle reconstruction: reconstruction arbor_v 1(except ww_sl_muq, ww_sl_tauq, zzorww_h_udud, zzorww_h_cscs) Z decay Neutrinos (all) Charged leptons (all) Electron Muon Tau Hadrons (all) 20. 50% Event choice: Zee. Huu 10. 20% Zuu. Huu Znn. Huu 3. 40% Zjj. Huu 3. 40% 69. 20% num==1&&nup==1&&nem==1&&nep==1&&nothch==0 num==2&&nup==2&&nem==0&&nep==0&&nothch==0 num==1&&nup==1&&nem==0&&nep==0&&nothch==0 !(num<=2&&nup<=2&&nem<=1&&nep<=1&&nothch==0) &&num>0&&nup>0 num: number of unup: number of u+ nem: number of enep: number of e+ nothch: number of the other charged particles 7

Znn. Huu Channel Variables: dium dinm recoilu recoiln ptdiu pzdiu met mez cosum cosup ptuu cosumn cosupn Invariant mass of di-moun Invariant mass of missing particles Recoil mass of di-moun Recoil mass of missing particles Pt of di-muon Abs(Pz of di-muon) Pt of missing particles Abs(Pz of missing particles) Cos(polar angle of u-) Cos(polar angle of u+) the angle between the di-muon' pt Cos(the angle between u- and missing particles) Cos(the angle between u+ and missing particles) Pre-section: To choose the events that have missing particles, dinm must over 0. Because the neutrinos are from Z boson, the condition can be: dinm>85. (no fake rate in signal)

Cut-Chain: pre SZ 60440. 3 Znn. Huu ZZ WW(SW) ZZor. WW 42614. 9 244464. 0 373949. 4 2 f 0. 0 bkg 721468. 6 sig 44. 4 120<dium<130 120<recoiln<130 256. 7 250. 3 10945. 1 22875. 2 0. 0 34327. 3 37. 8 90<recoilu<93 90<dinm<93 85. 2 90. 6 823. 7 1508. 9 0. 0 2508. 5 24. 4 Main BKG: ZZor. WW_lmumu: 1505. 9 WW_l: 823. 7 9

MVA(BDT): Remove the less important variable. Finally, the variables are used for BDT are: ptdiu pzdiu mez cosum cosup ptuu 10

Cut-Chain and fit result: pre 120<dium<130 120<recoiln<130 90<recoilu<93 90<dinm<93 MVA(BDT)>0 effection SZ 60440. 3 Znn. Huu ZZ WW(SW) ZZor. WW 42614. 9 244464. 0 373949. 4 2 f 0. 0 bkg 721468. 6 sig 44. 4 256. 7 250. 3 10945. 1 22875. 2 0. 0 34327. 3 37. 8 85. 2 90. 6 823. 7 1508. 9 0. 0 2508. 5 24. 4 308. 0 18. 2 41. 0% BKG：third order Chebychev function Signal：CBShape function Significance： 2. 32 11

Zjj. Huu Channel Variables: jet 1 m jet 2 m jet 1 u 1 a jet 1 u 2 a jet 2 u 1 a jet 2 u 2 a jet 1 u 1 at jet 1 u 2 at jet 2 u 1 at jet 2 u 2 at dijm dium recoilu recoilj ptu pzu ptj pzj Invariant mass of jet 1 Invariant mass of jet 2 the angle between jet 1 and u+ the angle between jet 1 and uthe angle between jet 2 and u+ the angle between jet 2 and uthe angle between jet 1's pt and u+'pt the angle between jet 1's pt and u-'pt the angle between jet 2's pt and u+'pt the angle between jet 2's pt and u-'pt Invariant mass of di-jet Invariant mass of di-moun Recoil mass of di-jet Pt of di-muon Abs(Pz of di-muon) Pt of di-jet Abs(Pz of di-jet) cosum cosup cosj 1 cosj 2 yy 12 yy 23 yy 34 yy 45 ptuu ptjj ptzh umed uped jet 1 ed jet 2 ed polar angle of u+ polar angle of jet 1 polar angle of jet 2 y 12 y 23 y 34 y 45 the angle between the di-muon' pt the angle between the di-jet' pt the angle between the Z'pt and H' pt Energy of u+ Energy of jet 1 Energy of jet 2 12

Pre-section: Signal Traverse 2 D histogram of jet 1 m and jet 2 m and find when jet 1 m>5 and jet 2 m>3 the fake rate is smallest, 0. 23% Cut-Chain: pre 120<dium<130 90<recoilu<93 abs(pzu)<63 abs(pzj)<75 ptu<64 ptj<80 Main BKG: SZ 22342. 9 8. 0 1. 0 ZZ 622906. 6 3745. 4 1053. 0 Zjj. Huu WW(SW) 3328308. 5 10553. 1 685. 5 1. 0 989. 6 659. 2 ZZor. WW 1798982. 3 10. 7 1. 3 2 f 14967017. 0 0. 0 bkg 20739557. 4 14317. 2 1740. 8 sig 151. 3 132. 9 82. 2 0. 0 1649. 8 82. 1 zzsl_mudown_or_up: 983. 6 wwsl_muq: 659. 2 13

Two way to reduce the wwsl_muq: dijm>76 No good cut jetxuxa>0. 9 cut: dijm>80 abs(pzu)<63 abs(pzj)<75 ptu<64 ptj<80 dijm>76 SZ ZZ WW(SW) ZZor. WW 2 f bkg sig 1. 0 989. 6 659. 2 0. 0 1649. 8 82. 1 1. 0 803. 2 8. 4 0. 0 812. 6 77. 9 14

MVA(BDT): Use different variables' combine and find the best one dijm recoilj ptu pzu ptj pzj 15

BKG：third order Chebychev function Signal：CBShape function Significance： 7. 93 pre 120<dium<130 90<recoilu<93 abs(pzu)<63 abs(pzj)<75 ptu<64 ptj<80 dijm>76 MVA(BDT)>0. 07 effection SZ 22342. 9 8. 0 1. 0 ZZ 622906. 6 3745. 4 1053. 0 Zjj. Huu WW(SW) 3328308. 5 10553. 1 685. 5 1. 0 989. 6 659. 2 0. 0 1649. 8 82. 1 1. 0 803. 2 8. 4 0. 0 812. 6 288 77. 9 58. 1 51. 5% ZZor. WW 1798982. 3 10. 7 1. 3 2 f 14967017. 0 0. 0 bkg 20739557. 4 14317. 2 1740. 8 sig 151. 3 132. 9 82. 2 16

Simultaneous fit BKG：third order Chebychev function Signal：CBShape function Significance： 7. 83

Zee. Huu and Zuu. Huu (bkg: fast) presection 120<dium<130 89<recoilu<100 diem<92 recoile>124 90<recoilu<93 mva>0. 51 Normalization Eff Signal 272 241 214 214 141 110 2. 64 40% Zee. Huu（SVM） sz zz ww(sw) 2045762 1890 210 1806 5 0 290 3 0 227 3 0 209 3 0 zow 1 0 0 2 f 1894 0 0 bkg 2049757 1811 293 230 212 ww(sw) 0 0 zow 0 0 2 f 0 0 bkg 45060 2229 1217 348 83 27 27 Zee. Huu: Significance=0. 5 Zuu. Huu(BDT) zz 45060 2229 1217 348 presection 120<(di-mu)H. M<130 89<(recoil-mu)H. M<121 84<(di-mu)Z. M<94 signal 302 271 258 sz 0 0 123. 5<(recoil-mu)Z. M<150 258 0 267 0 0 0 267 mva>-0. 05 diumall<250 recoilall>0 normalization eff 232 184 4. 41 61% 0 0 0 57 49 29 0 0 0 0 0 57 49 29 29 Zuu. Huu: Significance=0. 75

Conclusion znnhuu zjjhuu combine zeehuu zuuhuu inclusive N_sig 18. 2 58. 1 76. 3 2. 64 4. 41 45. 7 N_sig_fit 13. 7± 6. 7 57. 0± 9. 6 13. 9± 6. 6 / 57. 4± 9. 4 BKG: fast simulation - sigma 0. 247 0. 227 0. 245 - mean 124. 85 124. 84 - significance 2. 32 7. 93 7. 83 0. 50 0. 75 5. 89 Next： 1 Update all analysis to full simulation and give the strength 2 H-> tau+moun 3 Write note 19

THANK YOU 20

BACKUP sze_lmu full fast Pt also have some problem 21

3 sigma: 0. 63 -1. 38 1 sigma: 0. 8 -1. 18 22