# EST Eficiencies

• Some usefull definitions
The new Est tracking is acually set to reconstruct tracks going trough SVT and TPC in the following to patterns:
• Pattern 1. Tracks with 3 or more hits on SVT with at least 1 hit in each barrel (because of overlapping a track may have 2 hits in a given barrel).
• Pattern 2. Tracks with 2 or more hits on SVT with at least 2 hits in 2 differents barrels.

For this first look at the efficiencies of Est in MDC4 I will define the 2 values, efficiency and purity as:

• effiency = Number of Monte Carlo tracks(MC) with the pattern 1(2) associated to a Reconstructed track(RC) with the pattern 1(2) Divided by the Number of MC tracks with the pattern 1(2)
• purity = Number of RC tracks with the pattern 1(2) associated to a MC track with the pattern 1(2)Divided by the Number of RC tracks with the pattern 1(2)
• Efficiency and purity for primary tracks

• Pattern 1 : 1 hit in each SVT barrel

Efficiency and purity for primary tracks with the pattern 1 as a function of transverse momentum(Upper), pseudoRapidity(Midlle) and phi(Bottom). The efficiency is around 80% with a purity of 90% !

• Pattern 2 : 2 hit in 2 SVT barrel

•

Efficiency and purity for primary tracks with the pattern 2 as a function of transverse momentum(Upper), pseudoRapidity(Midlle) and phi(Bottom). The efficiency is around 70% with a purity of 85% !

• Efficiency and purity for scondary tracks

To evaluate the efficiency of reconstruction of secondaries tracks, I define the Efficiency as above, but when selecting the good MC trcaks I request this tracks NOT to came from the primary vertex. The purity is also defined as above but selecting  globals RC tracks I ask them NOT to have a primary track partner.

• Pattern 1 : 1 hit in each SVT barrel