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Geometrical efficiencies of a 3-sector Pixel prototype via GEANT

Geometrical efficiencies of a 3-sector Pixel prototype via GEANT. Original note based on a MathCAD simulation by H.Wieman http://www-rnc.lbl.gov/~wieman/D_efficiency.htm and http://www-rnc.lbl.gov/~wieman:D_efficiency_2.htm (you need IE or other compatible browser).

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Geometrical efficiencies of a 3-sector Pixel prototype via GEANT

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  1. Geometrical efficiencies of a 3-sector Pixel prototype via GEANT Original note based on a MathCAD simulation by H.Wieman http://www-rnc.lbl.gov/~wieman/D_efficiency.htm and http://www-rnc.lbl.gov/~wieman:D_efficiency_2.htm (you need IE or other compatible browser) J. Joseph, S. Margetis and J. Vanfossen Input data used We used ‘data’ from our own production using the UPGR13 geometry to best match Howard’s input Sept 28, 2007

  2. UPGR13 GEOMETRY R vs Z X vs Y • Detector hits look fine • Extends to |z|<=10cm • One Inner ladder covers 40 degrees in Phi

  3. h Our input has D0s uniformly in |eta|<=3 like HW

  4. pt Event_Vertex_Z (cm) • D0s are flat in pt • Event vertex gaussian with  = 10 cm like HW

  5. Excellent agreement now

  6. UPGR13 geometry AND daughters must also have • >=10 TPC hits • NPixHits >=2 • ‘particles decay’ Fraction of D0s that daughters have|eta|<= 1andp>=0.8GeVand are intercepted in the ‘detector’. My detector HW detector • Single Cylindrical surface at 8 cm radius only (same z coverage) Good agreement given the slight differences

  7. 3-patch Pixel simulation, each covering 40 degrees 400 p If the emission momentum vector of a daughter track falls in any angular cut then it is assumed as hitting the Pixels. Particle decays are included

  8. GEANT Ratio of: ‘All D0s with daughters that hit the patches’ to ‘All D0s with daughters in [eta<=1 and p>0.8]’ Remarkable agreement given that on the left we have included particle decays, TPC sector gaps and extra (# of hits) requirements

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