I am working on this under the guidence of Gene Van Buren.

We are looking for pT resolution of TPC Using TOF in the cosmic trigger with different anode voltage.

 

Run number with different anode voltage:

1.  run 11159020 : 1135V / 1390V (inner / outer)

2.  run 11159008 : 1100V / 1390V

3. run 11159010 : 1100V / 1345v

4. run 11159015 : 1070V / 1345V

Steps done:

1. Run over BFC on dac files.

2. Run over MuDst to find hit point positions and P_x,y,z

_{3. Selecting only those events, having 2tracks.}

_{4. Finding polar and azimuthal angle to select tracks, back to back.}

5. Selecting tracks having hit points within a sector and events having tracks in opposite sectors.

6. FitSlicesY using a Gaussian and then plot the means Δ(1/p_T), and widths divided by √2 to represent single track resolution δ(1/p_T).

7. Fitting δ(1/p_T) by the function "√{  U/[s⁴ (n+6)]  +  [V (1 + m² cos²θ/p_T²)]/(s p_T²)  }". where s is the track length, n is the number of position measurements (hits), θ is the dip angle and m is the particle mass (so m² ≅ 0.01 for muons), U and V are constants.

 

 

Phi dependence of pT:

eta dependance:

 

 

First and last hit points of a track

 

P_T resolution with diff

pT resolution when the 1st and last hit points of the tracks are in any sector and also the 1st and 2nd track are in any sector:

1. (1.63554+/-0.02321)%

2. (1.69734+/-0.02516)%                                                                 

3. (1.74293+/-0.02335)%

4. (1.77852+/-0.03218)%    

 

pT resolution when the 1st and last hit points of the tracks are in one sector and also the 1st and 2nd track are in any sector.

1. (1.56720+/-0.04525)%

2. (1.57860+/-0.04770)%

3. (1.61769+/-0.04727)%

4. (1.77225+/-0.091379)%

 

pT resolution when the 1st and last hit points of the tracks are in one sector and also the 1st and 2nd track are in opposite  sector.

1. (1.337+/-0.08935)%

2. (1.3876+/-0.10541)%

3. (1.34413+-0.1104)%

4. (1.852+/-0.27550)%

 

The corresponding plots are given below.

 

 

 

Resolution(multiplied by sqrt(2)) for different sector is  given below.