1. Physics performance with SB2009 Progress report of a study by QuickSimulator Akiya Miyamoto 15-Jan-2010 KEK SB2009 WG Meeting

2. Introduction As a quick check of physics performance, a study of Higgs signal has been performed using QuickSimulator. A preliminary report of the study are reported. Samples were produced and analized by JSF/SimTools tools. 2 2010/1/15 Akiya Miyamoto SB2009 WG Meeting

3. Generator and QuickSimulator Event generator  Pythia 6.416  Beam polarization 0  Convoluted with luminosity spectrums simulated by CAIN. QuickSimulator  gld_v3.com, but no Intermediate Tracker ( to avoid a problem in vertexing )  Consists of 3 layers of VTX, TPC, ECAL/HCAL  Expected performance: ( not tested in recent code ) Momentum resolution :  p t /p t 2 ~ 5x10 -5 at high momentum, worse than ILD performance. Jet energy resolution :  E/E ~ 30%/Sqrt(E) 3 2010/1/15 Akiya Miyamoto SB2009 WG Meeting

4. RDRSB2009 w/o TFSB2009 wTF RDRSB2009 wTF CM Energy (GeV) 250350500250a250b350500250a250b350500 300 Ne-(*10 10 )2.05 222 222 2 Ne+(*10 10 )2.05 122 122 2 nb2625 1312 26251312 F(Hz)55552.5555 55 55  x(*10 -6 )10  y(*10 -8 )4443.5 4 xx22 2021 151121 1511 2217.5 yy0.5 0.40.48 0.2 0.50.2  z(mm)0.3 L(10 34 cm -2 s -1 ) by GDE 0.751.220.20.220.71.50.250.2712 dE/E(e-, %)0.2720.1940.1360.220 0.2180.2070.220 0.2180.207 0.2300.240 dE/E(e+, %)0.1800.1290.0900.130 0.0930.0650.130 0.0930.065 0.1500.108 L(10 34 cm -2 s -1 ) by CAIN 0.971.362.150.240.260.91.680.30.341.22.3 1.170.93 L(10 34 cm -2 s -1 ) by GP 0.9011.2912.070.2210.2380.8591.6550.2880.3241.1782.342 Beam parameters from GDE WG’s table 4 2010/1/15 Akiya Miyamoto SB2009 WG Meeting Private parameter Cain/GuineaPig calculation

5. Luminosity Spectrum 2 dimensional luminosity spectrum generated by CAIN are fitted to get functions 5 2010/1/15 Akiya Miyamoto SB2009 WG Meeting Typical spectrum including initial beam energy spread and beamstrahlung for 250 GeV and 500 GeV center of mass energy

6. Recoil Mass – 500fb -1 6 2010/1/15 Akiya Miyamoto SB2009 WG Meeting Selection: #  =2, |Mz(  )-91.19|<10.0, |cos  (  )|<0.9 Recoil mass(GeV/c 2 ) RDR SB2009 wTF Measurement near threshold is the best for Higgs recoil mass study

7. Recoil mass – 500 days 7 2010/1/15 Akiya Miyamoto SB2009 WG Meeting Background processes are yet to be included rdr_250 parameter gives the sharpest distribution. Recoil mass(GeV/c 2 ) Events/1 GeV

8. Visible Energy – 200days running 8 2010/1/15 Akiya Miyamoto SB2009 WG Meeting Evis/Ecm(nominal) S-channel 4j 2 2j t-channel Obvious difference in spectrum between RDR and SB2009_wTF is not seen

9. Other observables for 2 2j selection 9 2010/1/15 Akiya Miyamoto SB2009 WG Meeting noff: Number of charged track whose closest approach to ip (3D) is more than 4 sigma. Used for b/c quark selection All Higgs events noffNoff noff is smaller at higher energies.

10. Selection of H (RDR parameters ) 10 2010/1/15 Akiya Miyamoto SB2009 WG Meeting Mh(GeV/c 2 ) ZZ ZH/xxH Selection Criteria 1.0.2 < Xevis < 0.55 ( Xevis=Evis/Ecm(nominal)) 2. noff > 3 - As background process, only ZZ process is considered. - Largest statistics at 500 GeV, but other background channel and tight selection should be considered ! - About 5 GeV shift in Mh, due impperfect Ejet calibration

11. Selection of H (SB2009_wTF) 11 2010/1/15 Akiya Miyamoto SB2009 WG Meeting Mh(GeV/c 2 ) ZZ ZH/xxH Selection Criteria 1.0.2 < Xevis < 0.55 ( Xevis=Evis/Ecm(nominal)) 2. noff > 3 For fixed running time, 500 GeV running has the largest statistics. Effect of other backgrounds, yet to be studied

12. Summary Physics performance with SB2009 beam parameters are being studied using QuickSimulator Higgs Recoil mass resolution  RDR_250 provides the best performance as long as recoil mass resolution is concerned. nnH channel  500 GeV running gives the largest statistics, but effect of other background needs to be studied Next  Analysis of 4 jets mode, improve analysis methods  Include analysis of Tim’s new 350 GeV SM sample  Quantitative evaluation of performances, such as  mh,  (br)  Comparison with full simulation based studies.  … 12 2010/1/15 Akiya Miyamoto SB2009 WG Meeting

13. 2010/1/15 Akiya MiyamotoSB2009 WG Meeting 13 BACKUP SLIDES

14. Recoil mass by generator only 14 2010/1/15 Akiya Miyamoto SB2009 WG Meeting To see only the kinematical effect, recoil mass were calculated by the generator information and plotted. No event selection Histograms are scaled to have the same entries in 110 < mh < 160 GeV Recoil mass(GeV/c 2 ) Events/1 GeV rdr 250 rdr 300 rdr 350