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Research Update May 7, 2013 - PowerPoint PPT Presentation


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Research Update May 7, 2013. We need more Kk2f (standalone) MC data to understand the magnitude and sign of the A FB . 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)

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slide1

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
slide5

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

slide6

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

slide7

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

slide8

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

slide9

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

slide10

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

slide11

Forward Backward asymmetries from the MC Sample of Kk2F Generator

Gamma, Z interference is roughly half the size of pure QED and opposite sign.

slide12

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

slide14

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