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# QA plots Rho (February 16 2009)

Updated on Tue, 2009-02-24 14:09. Originally created by starembed on 2009-02-16 15:46.
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**QA P06ib (Rho->pi+pi)**

This is the QA for P06ib (Rho- > pi+pi). reconstruction on Global Tracks (pions)

**1. dEdx**

Reconstruction on Pion Daugthers.

**2. DCA Distributions**

An__ __original 3D histogram had been created and filled with pT, Eta and DCA as the 3 coordinates. Projection on PtBins and EtaBins had been made to create this "matrix" of plots.

Pt Bin array used : { 0.5, 0.6, 0.8, 1.0} (moves down) and

Eta Bin array : {0.2, 0.5, 0.8, 1.0} (moves to the right)

For the Error bars, i used the option hist->Sumw2();

**2b. Compared with MuDst**

**3. NFit Distributions**

Similarly An Original 3D Histogram had been created with Pt, Eta and Nfit as coordinates. Respective projections had been made in the same pT and Eta Bins as the DCa distributions.

Pt Bin array used : { 0.5, 0.6, 0.8, 1.0} (moves down) and

Eta Bin array : {0.2, 0.5, 0.8, 1.0} (moves to the right)

For the Error bars, i used the option hist->Sumw2();

**3b. Reconstructed compared with MuDsts**

__4. Delta Vertex__

The following are the Delta Vertex ( Vertex Reconstructed - Vertex Embedded) plot for the 3 diiferent coordinates (x, y and z) (Cuts of vz =30 cm , NFitCut= 25 are applied)

**5. Z Vertex and X vs Y vertex**

**6. Global Variables : Phi and Rapidity**

__7. Pt__

Embedded Rho meson with flat pt (black)and Recosntructed Pion (red).

**8. Randomness Plots **

The following plots, are to check the randomness of the input Monte Carlo (MC) tracks.

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