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γ + d → p + p + π - Analysis Status

γ + d → p + p + π - Analysis Status. Y.C.Han@NKS2 Meeting Dec20, 2007. Outline. Debug in source and macro file Check analysis method w/ simulation Analysis of Jan2007’s experiment data. Debug. In source file P3TrVertex3D.cpp 1. debug three tracks’ rotation angle;

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γ + d → p + p + π - Analysis Status

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  1. γ+ d → p + p + π-AnalysisStatus Y.C.Han@NKS2 Meeting Dec20, 2007

  2. Outline • Debug in source and macro file • Check analysis method w/ simulation • Analysis of Jan2007’s experiment data

  3. Debug • In source file P3TrVertex3D.cpp 1. debug three tracks’ rotation angle; 2. return track’s momentum w/ mean values in two 2TrVertex reconstruction • In root macro files Correct the mixing use of three tracks’ momentum • Simulation Some changes of Generator upgrade the formater

  4. Check analysis method w/ simulation • Check simulation’s 3BPS generator uniform or not 2. Compare simulation data before and after analysis by check the geometrics and kinematics

  5. center of mass frame L1: p1 L2: p2 L3: π- ( MeV ) Uniform??

  6. The theta distibution don’t show uniform ?

  7. L1: p1 L2: p2 L3: π- ( MeV ) laboratory frame

  8. The method needs improve on Z Axis

  9. How to understand the two peaks tendency ?

  10. Peak less than PDG Mass ~24MeV

  11. Analysis of Jan2007 exp data • The data is under analyzed. There are about 70% data finished until this morning. The following are some of the preliminary check for these part data.

  12. w/o cut LVp1(MomP1, Ep1); LVp2(MomP2, Ep2); LVpi (MomPi, Epi); LVg(Momg, Eg); LVTar=LVp1+LVp2+LVpi-LVg;

  13. W/ PDG mass

  14. w/ reconstruct target mass cut Simulation

  15. w/ reconstruct target mass cut Simulation The difference from simulation is from ground, fluctuation due to small events #, or simple simulation ?

  16. w/ reconstruct target mass cut

  17. c.f. LVmiss W/O cut

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