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LCWS2013 Higgs Recoil Mass Study at 350 GeV Apr 27, 2014 Jacqueline Yan Komamiya Lab, Univ. of Tokyo 富山 12013/07/20.

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Presentation on theme: "LCWS2013 Higgs Recoil Mass Study at 350 GeV Apr 27, 2014 Jacqueline Yan Komamiya Lab, Univ. of Tokyo 富山 12013/07/20."— Presentation transcript:

1 LCWS2013 Higgs Recoil Mass Study at 350 GeV Apr 27, 2014 Jacqueline Yan Komamiya Lab, Univ. of Tokyo ILC@ 富山 12013/07/20

2 What’s New This Week  improve (correct) fitting method  re-evaluate data selection performance and cross section error  Compare alternative polarization scenarios  Comparison with sqrt(s)=250 GeV  Summary & Plans Goal: precise measurement of Higgs mass cross section σ H recoil mass study using e+e-  Zh  μ+μ-h Ec.m.s. = 250 GeV, L = 250 fb-1 Ec.m.s. = 350 GeV, L = 333 fb-1 polarization: (e-, e+) = (- 0.8, + 0.3)

3 Signal sample: Pe2e2h_.eL.pR & Pe2e2h._eR.pL relevant BG process for Zmumu 4f_ZZ_leptonic 4f_ZZ_semileptonic 2f_Z_leptonic 4f_WW_leptonic 4f_WW_semileptonic 4fSingleZee_leptonic 4fSingleZnunu_leptonic 4f_ZZWWMix_leptonic 6f backgrounds (sqrt(s)=350 GeV) after all cuts, dominant BG are: sqrt(s) = 250 GeV : #1) 2f_Z_l #2) 4f_ZZ_sl #3) 4f_ZZWWMix_l sqrt(s) = 350 GeV : #1) 4f_ZZ_sl #2) 2f_Z_l #3) 4f_WW_sl no ttbar BG left after data selection

4 Δσ/σ ～ 4.1 % fitted recoil mass : Mh =125.7 GeV +/- 144 MeV recoil mass calculated recoil mass with correction for 14 mrad beam crossing angle  BG: 3 rd order polynomial  signal : GPET: 5 parameters : Gaus (left-side), Gaus + expo (right side) Final fitting: float only height and mean, fix others from BG shape and 1 st time fitting 1 st time: fit only signal float all 5 GPET pars

5 Final Selection for 350 GeV 84 GeV < M_mumu < 98 GeV 10 GeV < pT_mumu < 140 GeV coplanarity < 3 |cos(θ_Zpro)| < 0.91 (Z production angle) 120 GeV < Mrecoil < 140 GeV Muon Selection reject neutrals Ptot > 5 GeV small E_cluster / P_total < 0.5 opposite charge Best track selection : cos(track angle) < 0.98 & |D0/δD0| < 5 Best Z Candidate Selection 2 mu candidates with opposite charge choose pair with invariant mass closest to Z mass Evaluate performance in recoil mass range of 120– 140 GeV calculate recoil mass with correction for 14 mrad beam crossing angle

6 Sig + BG fitting using weighted bins Fitting in wide range 115-150 GeV Sig + BG Integrated fitted func in (120 – 140 GeV) error : 3.15/76.67 = 4.1 % Nsig = 1080+/-44 = 48.9 +/- 0.5 % Nbg= 3467 S/BG = 0.32 significance = 16.2 Very close to result from just counting under histogram < Nsig = 1089+/-45 = 48.9 +/- 0.5 % S/BG = 0.31 significance = 16.1

7 Compare Alternative Polarization Scenarios See supplementary EXCEL files (attached to meeting page)

8 Comparisons (0,0) seems best for both Δσ/σ (+0.8, -0.3) yields best S/N, Δσ/σ not bad either WW BGs significantly suppressed (< 1/10 of (-0.8, *0.3)) other major BGs less also (esp for eLpR) (< ½ of (-0.8, +0.3) even though statistics is lower, some BG process is suppressed ? no big difference between (-0.8, + 0.3) and (-0.8, 0) no big difference in cut efficiency for each individual BG process  is e+ polarization really necessary (practical)? Re-consider for 250 GeV (accelerator issues) ε Δσ/σ Nsig S/Nsignificance 350 GeV (-0.8,+0.3) 48.9+/-0.5%4.10% 1089+/-450.3116.1 (-0.8,0) 47.6+/-0.5%4.00% 865+/-34 0.3214.4 (0,0) 47.7+/-0.5%3.10% 737+/-23 0.3714.1 (+0.8,-0.3) 47.8+/-0.5%3.70% 738+/-27 0.4815.4 250 GeV (-0.8,+0.3) 69.9+/-0.5%4.10% 1752+/-720.2619 (-0.8,0) 67.2+/-0.5%4.00% 1390+/-560.2617 (0,0) 66.9+/-0.5%3.20% 1183+/-380.316.6

9 350 GeV(-0.8, + 0.3) (-0.8, 0) (0, 0) (+0.8, -0.3)

10 Compare with Results for 250 GeV

11 250 GeV(-0.8, + 0.3) (0, 0) (-0.8, 0)

12 Δσ/σ ～ 4.1 % fitted recoil mass : Mh =125.6 GeV +/- 144 MeV recoil mass calculated recoil mass with correction for 14 mrad beam crossing angle  BG: 3 rd order polynomial  signal : GPET: 5 parameters : Gaus (left-side), Gaus + expo (right side) Final fitting: float only height and mean, fix others from BG shape and 1 st time fitting 1 st time: fit only signal float all 5 GPET pars

13 Final Selection for 250 GeV analysis after filling root files 84 GeV < M_mumu < 98 GeV 10 GeV < pT_mumu < 70 GeV |cos(θ_Zpro)| < 0.91 (Z production angle) 120 GeV < Mrecoil < 140 GeV also tried 123 GeV – 135 GeV Muon Selection reject neutrals Ptot > 5 GeV small E_cluster / P_total < 0.5 opposite charge Best track selection cos(track angle) < 0.98 |D0/δD0| < 5 Best Z Candidate Selection 2 mu candidates with opposite charge if several possibilities : choose pair with invariant mass closest to Z mass Evaluate data selection efficiency in within range of 120– 140 GeV calculate recoil mass with correction for 14 mrad beam crossing angle

14 optimization of data selection method for Higgs recoil mass study using e+e-  Zh  μ+μ-h @ Ec.m.s =350 GeV, L = 333 fb-1 compared with @ Ec.m.s. = 250 GeV, L = 250 fb-1 350 GeV: ε_sig = 48,9 +/-0.5 %, S/B ～ 0.31, significance ～ 16.1 Δσmeas> / = 4.1 % fitted recoil mass : 125.7 GeV +/- 144 MeV 250 GeV: ε_sig = 69.9 +/-0.5 %, S/B ～ 0.26, significance ～ 19 Δσmeas> / = 4.1 % fitted recoil mass : 125.4 GeV +/- 44 MeV After improvement of fitting, efficiency and Δσ/σ seem much improved Compared different polarization scenarios : (-0.8, 0.3) vs (+ 0.8, -0.3) vs (0,0) (0,0) is best for Δσ/σ, not realistic (?) (+0.8, -0.3) seems to have better S/N (?), but not practical (?) not much difference between (-0.8,0) amd (-0.8, +0.3) Need to balance physics merits with accelerator (e+ production) issues Summary

15 Use Toy MC to evaluate cross section error may resolve some statistical fluctuations Deeper study of which process is suppressed by alternative polarization scenarios  improve data selection Implement Pt_bal and likelihood cut ? Plans

16 BACKUP

17 preliminary comparison of cut efficiency between MC truth and reconstructed for 350 GeV signal and a few dominant BGs : integrated under histograms, counted in region 123-135 GeV Rec cut signaleff4f_ZZ_sleff2f_Z_leff raw 2288100%188087100.00%2226361100.00% only best mu pair221497%2521713.41%32958114.80% cos(trackAng)<0.98220296%1990610.58%30514613.71% 84 <M_inv <98182480%53142.83%946714.25% 10 <P_Tdl<140181779%51982.76%260631.17% copl < 3 179078%48532.58%227661.02% cos(θZ)<0.91170775%36721.95%107650.48% 120 GeV <M_rec <140 GeV108948%11330.60%10500.05% MC cut signaleff4f_ZZ_sleff2f_Z_leff raw 2288100%188087100.00%2226361100.00% only best mu pair2288100%2621913.94%41798218.77% cos(trackAng)<0.98220897%173859.24%30629713.76% 84 <M_inv <98198187%51152.72%1026914.61% 10 <P_Tdl<140194585%50062.66%245391.10% copl < 3 194585%46912.49%245391.10% cos(θZ)<0.91185281%35991.91%118130.53% 120 GeV <M_rec <140 GeV125655%10560.56%9860.04%

18 MC reconstructed Black : muon- Green: muon + Muon track angle sqrt(s) = 350 GeV

19 more forward/ asymmetrical than 350 GeV MC reconstructed Black : muon- Green: muon + Muon track angle sqrt(s) = 250 GeV

20 (0, 0) (+0.8, -0.3) (-0.8, + 0.3) (-0.8, 0)

21 recoil mass cut 120-140 GeV fit in 114-140 GeV = 1115 +/- 46 = 42.8 +/- 1.7 % /sqrt( + ) = 14.7 / =0.24 Δσmeas> / = 4.1 % 250 GeV Compare 250 GeV & 350 GeV: integrate fitted functions Calculate Error of σmeas from relative error of height fitting recoil mass cut 120-140 GeV fit in 115 – 150 GeV = 1145 +/- 54 = 51.4 +/- 2.4 % /sqrt( + ) = 17.3 / =0.35 Δσmeas> / = 4.7 % 350 GeV recoil mass cut : 123 – 135 GeV fit in 114-140 GeV = 1169 +/- 48 = 44.9+/- 1.8 % /sqrt( + ) = 18.5 / =0.42 Δσmeas> / = 4.1 % recoil mass cut 120-140 GeV fit in 114-140 GeV = 1115 +/- 50 = 50.1 +/- 2.2 % /sqrt( + ) = 17.2 / =0.36 Δσmeas> / = 4.5 %

22 Compare different polarization scenarios sqrt(s) = 350 GeV L = 333 fb-1 For now, keep same cut parameters as (-0.8, +0.3) (they could be optimized) (0, 0) Pol weight(eLpR) = 0.5*0.5 Pol weight(eRpL) = 0.5*0.5 = 737 +/- 23 = 33.1+/- 1.0 % /sqrt( + ) = 14.2 / =0.37 Δσmeas> / = 3.1 % (+0.8, -0.3) Pol weight(eLpR) = 0.1*0.35 Pol weight(eRpL) = 0.9*0.65 n> = 737 +/- 27 = 33.1+/- 1.2 % /sqrt( + ) = 15.8 / =0.51 Δσmeas> / = 3.7 % (-0.8, + 0.3) Pol weight(eLpR) = 0.9*0.65 Pol weight(eRpL) = 0.1*0.35 = 1080 +/- 44 = 48.5 +/- 2.0 % /sqrt( + ) = 16.2 / =0.32 Δσmeas> / = 4.1 % (-0.8, 0) Pol weight(eLpR) = 0.9*0.5 Pol weight(eRpL) = 0.1*0.5 = 857 +/- 34 = 38.5+/- 1.5 % /sqrt( + ) = 14.5 / =0.32 Δσmeas> / = 4.0 %

23 Signal efficiency 61 % S/N  0.39 Significance 〜 21.2 Evaluation in 123 – 135 GeV region sqrt(s) = 250 GeV count under histograms

24 DBD Samples event weight = pol_weight * ( process_cross_section * assumed_integrated_luminosity ) / ( number_of_reconstructed_events ) sqrt(s) = 250 GeV /grid/ilc/prod/ilc/mc-dbd/ild/dst-merged/250-TDR_ws/ 20 x Higher statistics data : /hsm/ilc/grid/storm/user/a/amiyamot/myprod/ild/dst-merged / 250-TDR_ws/ reference: meta files and diagrams in http://ilcsoft.desy.de/dbd/generated/other.htmlhttp://ilcsoft.desy.de/dbd/generated/other.html sqrt(s) = 350 GeV /grid/ilc/prod/ilc/mc-dbd/ild/dst-merged/350-TDR_ws/ List of samples: http://www-jlc.kek.jp/~miyamoto/CDS/prod_status/REC_ILD_o1_v05_350GeV.html http://www-jlc.kek.jp/~miyamoto/CDS/prod_status/REC_ILD_o1_v05_350GeV.html Lumosity TDR baseline sqrt(s)=250 GeV, Lumi=0.75 x 10^34 cm^-2 s^-1  assume L = 250 fb-1 sqrt(s)=350 GeV, Lumi=1.0 x 10^34 cm^-2 s^-1  assume L = 333 fb-1 Polarization: (-0.8, + 0.3)  compare with (+0.8, -0.3)

25 stacked, eLpR stacked, eRpL 250 GeV

26 recoil mass after implementing all cuts Black : MC Red: reconstructed pT Invariant mass

27 Black : MC Red: reconstructed Z production angle coplanarity

28 dilepton PT, 350 GeV do cut : 10 GeV< pT_dl < 140 GeV Signal, 250 GeV : 0 – 80 GeV peak at about 60 GeV Before cuts) Signal, 350 GeV : 0 – 140 GeV peak at about 135 GeV Before cuts)

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