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Understanding AFB through Kk2f MC Data Analysis at Varying CM Energies

This research highlights the need for more standalone Kk2f Monte Carlo data to analyze the forward-backward asymmetry (AFB) across different center-of-mass (CM) energies, specifically 10.58, 29, 34.5, and 35 GeV. We present AFB values derived from the Kk2f generator, contrasting predicted distributions for weak and QED processes while factoring in interference effects. Results showcase AFB values for muon pair production, where systematic comparisons with previously published cross-sections are performed. The systematic data offers insights into the magnitudes and signs of AFB across the observed energy spectrum.

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Understanding AFB through Kk2f MC Data Analysis at Varying CM Energies

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  1. Research Update May 7, 2013 • We need more Kk2f (standalone) MC data to understand the magnitude and sign of the AFB. The CM energies are • sqrt(s)=34.5 GeV (Expt: TASSO, published R.J. Cashmore, 1986) • sqrt(s)=35 GeV (Expt: TASSO, published R.J. Braunschweig, 1986) • See the plots in the next pages

  2. AFB values fors=10.58, 29, 34.5, 35 GeV

  3. AFB values for s=10.58 R1 and R6 R1 (data with Backbround) NO. NAME VALUE ERROR SIZE DERIVATIVE 1 a0 4.70349e+05 2.34420e+02 2.03056e+00 1.51587e-10 2 a1 -1.87190e+04 3.65010e+02 4.50364e+00 -2.20879e-12 3 a2 4.70109e+05 8.28597e+02 7.14239e+00 4.32948e-11

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

  5. Polar Angle Distribution of the Kk2f MC data with the removal of ISR+FSR(New) CM=10.58GeVher=8.99 GeV ler=3.1175GeVISR+FSR removed10M data for all processes

  6. Polar Angle Distribution of the Kk2f MC data with the removal of ISR+FSR(old) CM=10.58GeVher=8.99 GeV ler=3.1175GeVISR+FSR removed10M data for QED processes

  7. Polar Angle Distribution of the Kk2f MC data with the removal of ISR+FSR(old) CM=10.58GeVher=8.99 GeV ler=3.1175GeVISR+FSR removed10M data for Weak processes

  8. Polar Angle Distribution From the Kk2f MC Sample when FSR is off(old) CM=10.58GeVher=8.99 GeV ler=3.1175GeVISR+FSR on10M dataAFB got from fitted value

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

  10. Systematic Study Using Kk2F Generator old and shown before to 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 (old and shown before)

  12. Backup: Preliminary Result of AFB @ BaBar old and shown before • -: |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

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