dN/dx for TPC and DCH

Implementation of dN/dx for TPC and DCH

Current implementation is a track-level sampling of dN/dx from Garfield++ simulation. Two "Algorithms" and one "Service" are created. The "Algorithms" call the SimplePIDSvc to sampling the dN/dx from 2D histograms of dN/dx mean and dN/dx sigma.

The "Algorithms", named TPCDndxAlg and DCHDndxAlg, are located in: Reconstruction/ParticleID

The "Service" is located in: Service/SimplePIDSvc

Preliminary checks:

• Particle: Pions
• Momentum: 5 GeV/c
• Polar angle: 60 deg

1. dN/dx distribution

2. Chi dN/dx distribution