1. Asian Physics and Software meeting Akiya Miyamoto KEK 3-September-2010

2. Comparison of Lum. Spectrum Lum spectrum generator.  Tim’s version: Using GunieaPig. Used for Whizard event generation. Both Energy spread and Beamstrahlung are included. Fortran95  BSGEN: Based on a fit to CAIN lum spectrum. Only beamstrahlung and energy spread can be given at generation time C++ & ROOT Beam parameters  SB2009 500 wTF  SB2009 350 wTF  RDR_250(BSGEN) and Tim’s 250 GeV spectrum ( used for LOI) Lum spectrum are generated by two programs and various spectrum are compared.  Generated events: 5M events 3 September 2010 2 Akiya Miyamoto, Asian Physics and Software Meeting

3. 3 3 September 2010 Akiya Miyamoto, Asian Physics and Software Meeting Black: BSGEN Red: Tim SB2009_500_wTF Normalized e- energy Normalized CM energy Normalized Pz Black: BSGEN Red: Tim Black: BSGEN Red: Tim Black: BSGEN Red: Tim

4. 4 3 September 2010 Akiya Miyamoto, Asian Physics and Software Meeting Black: BSGEN Red: Tim SB2009_350_wTF Normalized e- energy Normalized CM energy Normalized Pz Black: BSGEN Red: Tim Black: BSGEN Red: Tim Black: BSGEN Red: Tim

5. Black: BSGEN Red: Tim RDR_250 Normalized e- energy Normalized CM energy Normalized Pz Black: BSGEN Red: Tim Black: BSGEN Red: Tim Black: BSGEN Red: Tim

6. Energy spread Fit by a single Gaussian. Fit range: 0.9985 to 1.0025 Fit Example: SB2009_500_wTF, BSGEN spectrum 3 September 2010 6 Akiya Miyamoto, Asian Physics and Software Meeting

7. Gaus fit summary 7 3 September 2010 Akiya Miyamoto, Asian Physics and Software Meeting RDR_250SB2009_350_wTFSB2009_500_wTF (e-)(e-) 0.2720.2810.207 (e+)(e+) 0.180.0930.065  (Average) 0.1630.1190.108  (BSGEN) 0.15280.1100.0986  (Tim) 0.17350.1260.116 *) value in %

8. Summary of Lum comparison Tim’s lumi function and BSGEN produce similar spectrum In the region of large beamstrahlung, Tim’s spectrum is not smooth shape. Probably because of low statistics. Initial beam energy spread: BSGEN produces narrower and Tim’s function produce wider spectrum. In principle, BSGEN could change run parameter to produce similar width as Tim’s or those estimated by naive formula. BSGEN seems to produce slightly unbalanced Pz spectrum. Cause is not understood yet. 8 3 September 2010 Akiya Miyamoto, Asian Physics and Software Meeting

9. ttbar at 350 GeV 9 3 September 2010 Akiya Miyamoto, Asian Physics and Software Meeting Physsim generator was modified to use Tim’s Lumi function, and total cross section of e+e-  ttbar at 350 GeV was calculated with QCD effect on(NRQCD=1) and off(NRQCD=0). QCD effect enhances total cross section by about factor 8. Whizard calculation: Cross section of bbcssc was divided by branching ratio to get total cross section

10. Lum spectrum dependance 10 3 September 2010 Akiya Miyamoto, Asian Physics and Software Meeting Difference between two lum. function is 1% or less

11. Physsim cross sections 11 3 September 2010 Akiya Miyamoto, Asian Physics and Software Meeting  (e - L e + R )  (e - R e + L ) bbqqqq505.52200.47 bbe qq 162.7464.26 bb  qq 64.14 bb  qq 162.0664.38 bbe e 13.165.15 bbe  26.2310.38 bbe  26.2810.34 bb  13.055.11 bb  26.0810.27 bb  12.965.18 ( in fb unit ) with QCD effect

12. Decay mode of tt->bbqqqq 12 3 September 2010 Akiya Miyamoto, Asian Physics and Software Meeting ud cd us cscs ub cb

13. Beam Pol. Asymmetry WhizardPhssim(w/o QCD) Physsim(w/ QCD)  (e - L e + R  tt  bbqqqq) fb74.44 72.82  0.05506.5  0.5  (e - R e + L  tt  bbqqqq) fb24.88 28.39  0.02200.4  0.2 Apol0.4990.4390.433 1/  QED 1/1321/128 sin  W 0.22225 MzGeV/c 2 91.1882 MWMW GeV/c 2 80.419 13 3 September 2010 Akiya Miyamoto, Asian Physics and Software Meeting