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We are trying to understand the magnitude and sign of the Forward-Backward

What are the issues after the last presentation in collaboration meeting. We are trying to understand the magnitude and sign of the Forward-Backward Asymmetry using the MC Generator in standalone mode. Kk2f MC data agreed with the published result ( sign and magnitude )

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We are trying to understand the magnitude and sign of the Forward-Backward

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  1. What are the issues after the last presentation in collaboration meeting • We are trying to understand the magnitude and sign of the Forward-Backward • Asymmetry using the MC Generator in standalone mode. • Kk2f MC data agreed with the published result (sign and magnitude) • Verified with two different published results. • CM=29GeV, her=14.5 GeV and ler 14.5 GeV (Physical Review Letter, Vol 51, Nov 21, 1983) • CM=13.9GeV, her=6.95 GeV and ler 6.95 GeV (Z. Phys. C, Page 163-170, 1988) ----planned • BaBar data agreed with the Kk2f MC data regarding magnitude • however the Sign is not agreed. • Discrepancy still remain unfound between MC data • (detector simulated) and BaBar data regarding magnitude. • However sign is the same in this case. • Discrepancy still remain unfound between positive and negative muon • both in MC and BaBar data.

  2. Some New Findings after the last Collaboration meeting • AFB calculation done by event counting using Kk2f MC Generator . The results are also verified with the fitting procedure. • We’ve presented the AFB using the MC data (Kk2f) in standalone mode. • For All processes (QED+Weak+Interection) • Only for QED process (with ISR*FSR on + Higher Orders) • Only for Weak process • Only for interaction part only (need to have the theoretical calculation to compare the result) • New Findings from Kk2f MC data in standalone mode: • Only QED processes by switching off ISR (All processes, only QED) • Only QED processes by switching off FSR (All processes, only QED) • Only QED processes by switching off higher order terms (boxes)--planned (however they are very low statistics, have to increase the stat.)

  3. Polar Angle Distribution From the MC Sample of Kk2F Generator Prediction for All Processes(QED+interference+WEAK) CM=10.58GeVher=8.99 GeV ler=3.1175GeV Prediction for only WEAK Process Prediction for only QED Process

  4. Polar Angle Distribution From the Kk2f MC Sample when ISR is off(New) CM=10.58GeVher=8.99 GeV ler=3.1175GeVISR off, FSR on1M data for all processes

  5. Polar Angle Distribution From the Kk2f MC Sample when ISR is off(New) CM=10.58GeVher=8.99 GeV ler=3.1175GeVISR off, FSR on1M data for only QED process

  6. Polar Angle Distribution From the Kk2f MC Sample when FSR is off(New) CM=10.58GeVher=8.99 GeV ler=3.1175GeVISR on, FSR off1M data for All processes

  7. Forward Backward asymmetries from the MC Sample of Kk2F Generator Gamma, Z interference is roughly half the size of pure QED and opposite sign.

  8. Systematic Study Using Kk2F Generatorto Check the sign and Magnitude : CM=10.58GeVher= 3.1175GeV ler=8.99GeV 1M data Prediction for All Processes(QED+interference+WEAK) CM=10.58GeVher=5.29GeV ler=5.29GeV 10M data

  9. Forward Backward asymmetries from the MC Sample of Kk2F Generator

  10. Systematic Study Using Kk2F Generatorto Compare the sign and Magnitude with a published paper Prediction for All Processes@ s=29GeV The dashed line corresponds to the O(3) QED cross-section and solid line to the fitted cross section. Center of Mass is 29GeV, her=14.5 GeV and ler 14.5 GeV

  11. Forward Backward asymmetries from the MC Sample of Kk2F Generator

  12. Backup: Preliminary Result of AFB @ BaBar • -: |AFB (R1)|- |AFB (R6)| =(-1.6  0.6)10-3 • +: |AFB (R1)|- |AFB (R6)| =(-1.6  0.6)10-3 • R1: |AFB(-)|- |AFB (+)|=(9.07.1)  10-4 • R6: |AFB(-)|- |AFB (+)|=(9.03.5)  10-4 • Data • -: |AFB (R1)|- |AFB (R6)| =(-1.4  0.5)  10-3 • +:|AFB (R1)|- |AFB (R6)| =(-1.4  0.5)  10-3 • R1 MC’s: |AFB(-)|- |AFB (+)|=(2.06.6)  10-4 • R6 MC’s: |AFB(-)|- |AFB (+)|=(2.03.5)  10-4 • MC’s

  13. Back up: Data and MC Samples Integrated Luminosity • BaBar Data Sample R(1-6): • L ~ 424.78fb-1for On Resonance. • L~ 45 fb-1 for Off Resonance. • Monte Carlo Sample R(1-6): for On Resonance , , , & • Generic : 441.64 • Generic : 16.49 • Generic :1761.00 • Generic :1642.98 • Generic : 918.32 • R24 skimmed datasets were used under analysis 52. • Current study with data of Run 1 (20.47fb-1) & Run6 (77.93 fb-1)

  14. Backup

  15. Forward-backward Asymmetries VS Center of mass energy Physics Reports, Volume 427, Issue 5-6, p. 257-454 1Phys. Rev. Lett. 41, 449-451 (1978). 2Phys. Rev. Lett. 51, 1941-1944 (1983) 3Phys. Rev. Lett. 50, 1238-1241 (1983).

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