Dedx status

Zoltán Fodor

KFKI – Research Institutefor Particle and Nuclear Physics

Zoltán Fodor 208.06.11

Status• Fully reconstructed runs /pC30, pp30,-C158 GeV/

are calibrated for timedepedence, ydependence, and sector constants using the 2007 BB function and amplitude loss corrections.

• dedxna61 client is updated for this runs

Zoltán Fodor 308.06.11

pC thin target

negativespositives

Zoltán Fodor 408.06.11

pp 30 Gev

negativespositives

Zoltán Fodor 508.06.11

-C 158 GeV

negativespositives

Zoltán Fodor 608.06.11

pC 30 thin target 2009

1.5 GeV 4.5 GeV 7.5 GeV 10.5 GeV

positives

negatives

Zoltán Fodor 708.06.11

pp 30 GeV

1.5 GeV 4.5 GeV 7.5 GeV 10.5 GeV

positives

negatives

Zoltán Fodor 808.06.11

-C 158 GeV

1.5 GeV 4.5 GeV 7.5 GeV 10.5 GeV

positives

negatives

Zoltán Fodor 908.06.11

pC 30 thin target 2009

14.5 GeV 18.5 GeV

positives

negatives

Zoltán Fodor 1008.06.11

pp 30 GeV

14.5 GeV 18.5 GeV

positives

negatives

Zoltán Fodor 1108.06.11

-C 158 GeV

14.5 GeV 18.5 GeV

positives

negatives

Zoltán Fodor 1208.06.11

To do• Amplitude loss corrections

– New simulations /on going/– then new calibrations for ydep (and sector constants)

• Chipgain calibration– 2 different calibration for pC and others /because of spikes/– Modified the dedxna61 client, to reject the chips with spikes– (Then new calibration of sector constants)

• BB calibrations for low and high momentum region, using all the datasets and selected particles by TOF /started/– Then new calibration of sector constants

• Jovan realized the dedx valu not propagate to the rootfiles for secondary tracks /in DSPACK exist/

Zoltán Fodor 1308.06.11

• Gauss function fitted to the peaks around the peak value

Zoltán Fodor 1408.06.11

• Changes of peak positions

pionspc2009/pc2007

protonspc2009/pc2007

pionspp30/pc2007

protonspp30/pc2007 pions

-C30/pc2007

Zoltán Fodor 1508.06.11

• The peak position is not changing with WFA cut

• The peak position is not changing with TOF selection /pC2007 and pC2009/

Zoltán Fodor 1608.06.11

Amplitude loss correction• The pC30 thin target and p-C158 are tested with different

corrections• The effect and corrections very close in the two datasets• Checked variation of diffusion on space direction, time

direction, thresholds, and several combination– For MTPC we can produce close to 0 absorption– For VTPC relatively high correction also give a negative

absorption

• Could be checked the gas composition dependence

Work on progress Thank to Nicolas to producing the new tables

Zoltán Fodor 1708.06.11

Diffx: no change

Difft: no change

Threshold: 6

Zoltán Fodor 1808.06.11

Diffx: no change

Difft: -20%

Threshold: 6

Zoltán Fodor 1908.06.11

Diffx: -20%

Difft: no change

Threshold: 6

Zoltán Fodor 2008.06.11

Diffx: no change

Difft: no change

Threshold: 5

Zoltán Fodor 2108.06.11

Diffx: -25%

Difft: -25%

Threshold: 6

Zoltán Fodor 2208.06.11

Diffx: -25%

Difft: -25%

Threshold: 5

Zoltán Fodor 2308.06.11