# ThreeDseparationplot

part of the DircPlayground

## 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:

1. Momentum Dependence

Plot Number of sigma in dependence of momentum p:

• Number of sigma:

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

## 2. Angle Dependence

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

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

## Pathlength:

(see PathLength, Aida Galoyan))with: Angle psi:

Pathlength of a partice in the radiator of the barrel:

## Number of measured Cherenkov photons:

Detected Cherenkov photons:

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

## Example on the treatment on the Phase Space Plots

pbar p to phi phi:

Cut momentum and theta angle:

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

-- GeorgSchepers - 29 Nov 2007

• Ref.: Aida Galoyan:
IAttachmentActionSizeDateWhoComment
gifFull.gifmanage 6.9 K 06 Dec 2007 - 16:21GeorgSchepers Number of sigma in depndence of momentum and theta angle
gifl.gifmanage 1.9 K 06 Dec 2007 - 16:18GeorgSchepers Pathlength of a partice in the radiator of the barrel
gifnphotonp.gifmanage 4.0 K 06 Dec 2007 - 16:13GeorgSchepers Number of measured Cherenkov photons
gifnphotonsdetected_plot.gifmanage 16.1 K 07 Dec 2007 - 17:35GeorgSchepers Detected Cherenkov photons
gifnsigma.gifmanage 2.5 K 06 Dec 2007 - 16:12GeorgSchepers Number of sigma
gifnsigma_p_plot.gifmanage 3.4 K 07 Dec 2007 - 17:38GeorgSchepers Number of sigma in dependence of momentum p
gifnsigma_p_theta_2000-4000.gifmanage 21.2 K 07 Dec 2007 - 17:40GeorgSchepers Number of sigma in dependence of momentum p (2000-4000MeV/c) and angle theta
gifnsigma_p_theta_500-5000.gifmanage 21.9 K 07 Dec 2007 - 17:39GeorgSchepers Number of sigma in dependence of momentum p (500-5000MeV/c) and angle theta
gifpathlength_thetapsi_plot.gifmanage 12.9 K 07 Dec 2007 - 14:27GeorgSchepers Pathlength
jpegpbarptophiphi_cutns.jpegmanage 48.8 K 11 Dec 2007 - 13:56GeorgSchepers Cut momentum and theta angle and number of sigma larger 4
jpegpbarptophiphi_cutptheta.jpegmanage 52.1 K 11 Dec 2007 - 13:55GeorgSchepers Cut momentum and theta angle
jpegppbartophiphi.jpegmanage 63.8 K 11 Dec 2007 - 13:54GeorgSchepers pbar p to phi phi
gifpsi.gifmanage 2.8 K 06 Dec 2007 - 16:20GeorgSchepers Angle psi
gifseparationpower.gifmanage 3.4 K 29 Nov 2007 - 16:17GeorgSchepers Separation power versus momentum
IAttachmentActionSizeDateWhoComment
gifFull.gifmanage 6.9 K 06 Dec 2007 - 16:21GeorgSchepers Number of sigma in depndence of momentum and theta angle
gifl.gifmanage 1.9 K 06 Dec 2007 - 16:18GeorgSchepers Pathlength of a partice in the radiator of the barrel
gifnphotonp.gifmanage 4.0 K 06 Dec 2007 - 16:13GeorgSchepers Number of measured Cherenkov photons
gifnphotonsdetected_plot.gifmanage 16.1 K 07 Dec 2007 - 17:35GeorgSchepers Detected Cherenkov photons
gifnsigma.gifmanage 2.5 K 06 Dec 2007 - 16:12GeorgSchepers Number of sigma
gifnsigma_p_plot.gifmanage 3.4 K 07 Dec 2007 - 17:38GeorgSchepers Number of sigma in dependence of momentum p
gifnsigma_p_theta_2000-4000.gifmanage 21.2 K 07 Dec 2007 - 17:40GeorgSchepers Number of sigma in dependence of momentum p (2000-4000MeV/c) and angle theta
gifnsigma_p_theta_500-5000.gifmanage 21.9 K 07 Dec 2007 - 17:39GeorgSchepers Number of sigma in dependence of momentum p (500-5000MeV/c) and angle theta
gifpathlength_thetapsi_plot.gifmanage 12.9 K 07 Dec 2007 - 14:27GeorgSchepers Pathlength
gifpsi.gifmanage 2.8 K 06 Dec 2007 - 16:20GeorgSchepers Angle psi
gifseparationpower.gifmanage 3.4 K 29 Nov 2007 - 16:17GeorgSchepers Separation power versus momentum

View topic | View difference side by side |  | More topic actions

Copyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding PANDA Wiki? Send feedback
Imprint (in German)