Difference: ThreeDseparationplot (r10 vs. r9)

r10 - 14 Jan 2008 - 16:06 - GeorgSchepers r9 - 14 Jan 2008 - 14:31 - GeorgSchepers


ThreeDseparationplot

ThreeDseparationplot



part of the DircPlayground

part of the DircPlayground

Calculation of the Separationpower in dependence of momentum and angle

Calculation of the Separationpower in dependence of momentum and angle

The dependence of N(sigma) from the momentum p and the angle theta is calculated and displayed with Mathematia:

The dependence of N(sigma) from the momentum p and the angle theta is calculated and displayed with Mathematia:

1. Momentum Dependence

1. Momentum Dependence

Plot Number of sigma in dependence of momentum p:
Number of sigma in dependence of momentum p

Plot Number of sigma in dependence of momentum p:
Number of sigma in dependence of momentum p

  • Number of sigma:
    Number of sigma
  • Number of sigma:
    Number of sigma


The plot represents the Numbers of sigmas two particles are separated depending on the mometum with

The plot represents the Numbers of sigmas two particles are separated depending on the mometum with

  • "sigma" = 0.01 is the resolution of a single photon track
  • "sigma/sqrt(nph)" gives the resolution of a track with
    • nph = 16 is a typical number of produced photons
  • Kaon = 493.68 MeV
  • pionn = 139.57
  • refractiv index n=1.47
  • "sigma" = 0.01 is the resolution of a single photon track
  • "sigma/sqrt(nph)" gives the resolution of a track with
    • nph = 16 is a typical number of produced photons
  • Kaon = 493.68 MeV
  • pionn = 139.57
  • refractiv index n=1.47


2. Angle Dependence

2. Angle Dependence

The number of produced photons denpends on the pathlength in the radiator which depends again on the incident angle.

The number of produced photons denpends on the pathlength in the radiator which depends again on the incident angle.

See also
http://www.gae.ucm.es/~emma/tesina/node4.html
See also
http://www.gae.ucm.es/~emma/tesina/node4.html

Pathlength:

Pathlength:

Pathlength of a partice in the radiator of the barrel (see PathLength, Aida Galoyan))with: Angle psi:
Angle psi

Pathlength of a partice in the radiator of the barrel (see PathLength, Aida Galoyan))with: Angle psi:
Angle psi



Pathlength of a partice in the radiator of the barrel:

Pathlength of a partice in the radiator of the barrel:



Pathlength

Pathlength

Number of measured Cherenkov photons:

Number of measured Cherenkov photons:

Number of measured Cherenkov photons

Number of measured Cherenkov photons



Detected Cherenkov photons:

Detected Cherenkov photons:



Detected Cherenkov photons

Detected Cherenkov photons

Number of sigma in dependence of momentum and theta angle:

Number of sigma in dependence of momentum and theta angle:

Number of sigma in depndence of momentum and theta angle

Number of sigma in depndence of momentum and theta angle



Number of sigma in dependence of momentum p (500-5000MeV/c) and angle theta:

Number of sigma in dependence of momentum p (500-5000MeV/c) and angle theta:



Number of sigma in dependence of momentum p (500-5000MeV/c) and angle theta

Number of sigma in dependence of momentum p (500-5000MeV/c) and angle theta



Number of sigma in dependence of momentum p (2000-4000MeV/c) and angle theta:

Number of sigma in dependence of momentum p (2000-4000MeV/c) and angle theta:



Number of sigma in dependence of momentum p (2000-4000MeV/c) and angle theta

Number of sigma in dependence of momentum p (2000-4000MeV/c) and angle theta



Example on the treatment on the Phase Space Plots

Example on the treatment on the Phase Space Plots



  

On the Example pbar p to phi phi it is shown which fraction of produced kaons can be separated from pions with the help of the Barrel Dirc. First one sees all the kaons produced, secondly the kaons in the solid angle and the lower threshold (of the Kaon detection) of the Cherenkov detector and last but not least all the kaons over the limit of numbers of sigma separation beeing 4. The latter conditions is done for the two track resolutions "sigma" (track) = 10 mrad and 30 mrad. It shows that we loose with a bad track resolution for higher monenta a not minor amount of kaons (meaning having a not sufficient resolution to separate them from pions) in the angular region of the Barel DIRC. Remark: The calculations are peliminary and the separation limit arbitrary.

On the Example pbar p to phi phi: is shown which numbers of kaon can be separated from the pions with the help of the Barrel Dirc. First one sees all the kaons produced, secondly the kaons in the solid angle of the detector and last but not least the kaon over the limit of numbers of sigma separation beeing 4. The latter conditions shows that we loose for higher monenta a not minor amount of kaons (meaning having a not sufficient resolution to separate them from pions) in the angular region of the Barel DIRC.



pbar p to phi phi

pbar p to phi phi



Cut momentum and theta angle:

Cut momentum and theta angle:



Cut momentum and theta angle

Cut momentum and theta angle



Cut momentum and theta angle and number of sigma larger 4:

Cut momentum and theta angle and number of sigma larger 4:



  

With a track resulution of 10 mrad:
traqck resulution 10 mrad

Cut momentum and theta angle and number of sigma larger 4

  

With a track resolution of 30 mrad:
Cut momentum and theta angle and number of sigma larger 4

-- GeorgSchepers - 29 Nov 2007

-- GeorgSchepers - 29 Nov 2007

  
IAttachmentActionSizeDateWhoComment
Full.gifgifFull.gifmanage 6.9 K 06 Dec 2007 - 16:21GeorgSchepers Number of sigma in depndence of momentum and theta angle
goodtrackresolution.jpegjpeg goodtrackresolution.jpeg manage30.5 K 14 Jan 2008 - 16:47 GeorgScheperstraqck resulution 10 mrad
l.gifgifl.gif manage1.9 K 06 Dec 2007 - 16:18 GeorgSchepersPathlength of a partice in the radiator of the barrel
nphotonp.gifgifnphotonp.gif manage4.0 K 06 Dec 2007 - 16:13 GeorgSchepersNumber of measured Cherenkov photons
nphotonsdetected_plot.gifgifnphotonsdetected_plot.gif manage16.1 K 07 Dec 2007 - 17:35 GeorgSchepersDetected Cherenkov photons
nsigma.gifgifnsigma.gif manage2.5 K 06 Dec 2007 - 16:12 GeorgSchepersNumber of sigma
nsigma_p_plot.gifgifnsigma_p_plot.gif manage3.4 K 07 Dec 2007 - 17:38 GeorgSchepersNumber of sigma in dependence of momentum p
nsigma_p_theta_2000-4000.gifgifnsigma_p_theta_2000-4000.gif manage21.2 K 07 Dec 2007 - 17:40 GeorgSchepersNumber of sigma in dependence of momentum p (2000-4000MeV/c) and angle theta
nsigma_p_theta_500-5000.gifgifnsigma_p_theta_500-5000.gif manage21.9 K 07 Dec 2007 - 17:39 GeorgSchepersNumber of sigma in dependence of momentum p (500-5000MeV/c) and angle theta
pathlength_thetapsi_plot.gifgif pathlength_thetapsi_plot.gif manage12.9 K 07 Dec 2007 - 14:27 GeorgSchepersPathlength
pbarptophiphi_cutns.jpegjpegpbarptophiphi_cutns.jpeg manage48.8 K 11 Dec 2007 - 13:56 GeorgSchepersCut momentum and theta angle and number of sigma larger 4
pbarptophiphi_cutptheta.jpegjpegpbarptophiphi_cutptheta.jpeg manage52.1 K 11 Dec 2007 - 13:55 GeorgSchepersCut momentum and theta angle
ppbartophiphi.jpegjpeg ppbartophiphi.jpeg manage63.8 K 11 Dec 2007 - 13:54 GeorgScheperspbar p to phi phi
psi.gifgifpsi.gif manage2.8 K 06 Dec 2007 - 16:20 GeorgSchepersAngle psi
separationpower.gifgifseparationpower.gifmanage 3.4 K 29 Nov 2007 - 16:17GeorgSchepers Separation power versus momentum
IAttachmentActionSizeDateWhoComment
Full.gifgifFull.gifmanage 6.9 K 06 Dec 2007 - 16:21GeorgSchepers Number of sigma in depndence of momentum and theta angle
l.gifgif l.gif manage1.9 K 06 Dec 2007 - 16:18 GeorgSchepersPathlength of a partice in the radiator of the barrel
nphotonp.gifgifnphotonp.gif manage4.0 K 06 Dec 2007 - 16:13 GeorgSchepersNumber of measured Cherenkov photons
nphotonsdetected_plot.gifgifnphotonsdetected_plot.gif manage16.1 K 07 Dec 2007 - 17:35 GeorgSchepersDetected Cherenkov photons
nsigma.gifgifnsigma.gif manage2.5 K 06 Dec 2007 - 16:12 GeorgSchepersNumber of sigma
nsigma_p_plot.gifgifnsigma_p_plot.gif manage3.4 K 07 Dec 2007 - 17:38 GeorgSchepersNumber of sigma in dependence of momentum p
nsigma_p_theta_2000-4000.gifgifnsigma_p_theta_2000-4000.gif manage21.2 K 07 Dec 2007 - 17:40 GeorgSchepersNumber of sigma in dependence of momentum p (2000-4000MeV/c) and angle theta
nsigma_p_theta_500-5000.gifgifnsigma_p_theta_500-5000.gif manage21.9 K 07 Dec 2007 - 17:39 GeorgSchepersNumber of sigma in dependence of momentum p (500-5000MeV/c) and angle theta
pathlength_thetapsi_plot.gifgifpathlength_thetapsi_plot.gif manage12.9 K 07 Dec 2007 - 14:27 GeorgSchepersPathlength
pbarptophiphi_cutns.jpegjpeg pbarptophiphi_cutns.jpeg manage48.8 K 11 Dec 2007 - 13:56 GeorgSchepersCut momentum and theta angle and number of sigma larger 4
pbarptophiphi_cutptheta.jpegjpegpbarptophiphi_cutptheta.jpeg manage52.1 K 11 Dec 2007 - 13:55 GeorgSchepersCut momentum and theta angle
ppbartophiphi.jpegjpegppbartophiphi.jpeg manage63.8 K 11 Dec 2007 - 13:54 GeorgScheperspbar p to phi phi
psi.gifgif psi.gif manage2.8 K 06 Dec 2007 - 16:20 GeorgSchepersAngle psi
separationpower.gifgifseparationpower.gif manage3.4 K 29 Nov 2007 - 16:17 GeorgSchepersSeparation power versus momentum
r10 - 14 Jan 2008 - 16:06 - GeorgSchepers r9 - 14 Jan 2008 - 14:31 - GeorgSchepers

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