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BRAHMS Global Tracking Enhancements

BRAHMS Global Tracking Enhancements. K. Hagel. Review of Original Procedure. Start with Track position and direction at T1. Perform Minuit fit varying p, ydir using starting values of p ave =(p d2 +p d3 +p d4 )/3, ydir of track.

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BRAHMS Global Tracking Enhancements

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  1. BRAHMS Global Tracking Enhancements K. Hagel

  2. Review of Original Procedure • Start with Track position and direction at T1. • Perform Minuit fit varying p, ydir using starting values of pave=(pd2+pd3+pd4)/3, ydir of track. • 2 calculated on (x,y) positions of local tracks in other tracking stations. • Swim backwards through D1 to vertex to obtain Zvtx, θ, .

  3. Enhancements to the code • Vary t1X and t1Y as fit parameters • Vary x direction as fit parameter • Calculate 2 “correctly” using “known” σs of detectors (position and angle) • 350 m TPCx • 500 m TPCy • 200 m DCx • .5mr in θ bend plane

  4. X difference

  5. Y difference

  6. Theta difference

  7. Attempt to resolve differences in positions • Shift detectors by difference of “where they want to be at” • t1y by -0.2cm • t2x by 0.1cm • t3y by 0.128cm • Affects the chisq calculation

  8. X difference (modified)

  9. Y difference (modified)

  10. Theta difference (modified)

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