Difference: ThreeDseparationplot (r8 vs. r7)


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 in dependence of momentum p

  • Number of sigma:
    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.

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

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:


Pathlength

Number of measured Cherenkov photons:

Number of measured Cherenkov photons


Detected Cherenkov photons:


Detected Cherenkov photons

Number of sigma in dependence 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 (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


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 and number of sigma larger 4:


Cut momentum and theta angle and number of sigma larger 4

-- GeorgSchepers - 29 Nov 2007

  • Ref.: Aida Galoyan:
    Ref.: Aida Galoyan
IAttachmentActionSizeDateWhoComment
Full.gifgifFull.gifmanage 6.9 K 06 Dec 2007 - 16:21GeorgSchepers Number of sigma in depndence of momentum and theta angle
l.gifgifl.gifmanage 1.9 K 06 Dec 2007 - 16:18GeorgSchepers Pathlength of a partice in the radiator of the barrel
nphotonp.gifgifnphotonp.gifmanage 4.0 K 06 Dec 2007 - 16:13GeorgSchepers Number of measured Cherenkov photons
nphotonsdetected_plot.gifgifnphotonsdetected_plot.gifmanage 16.1 K 07 Dec 2007 - 17:35GeorgSchepers Detected Cherenkov photons
nsigma.gifgifnsigma.gifmanage 2.5 K 06 Dec 2007 - 16:12GeorgSchepers Number of sigma
nsigma_p_plot.gifgifnsigma_p_plot.gifmanage 3.4 K 07 Dec 2007 - 17:38GeorgSchepers Number of sigma in dependence of momentum p
nsigma_p_theta_2000-4000.gifgifnsigma_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
nsigma_p_theta_500-5000.gifgifnsigma_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
pathlength_thetapsi_plot.gifgifpathlength_thetapsi_plot.gifmanage 12.9 K 07 Dec 2007 - 14:27GeorgSchepers Pathlength
pbarptophiphi_cutns.jpegjpegpbarptophiphi_cutns.jpegmanage 48.8 K 11 Dec 2007 - 13:56GeorgSchepers Cut momentum and theta angle and number of sigma larger 4
pbarptophiphi_cutptheta.jpegjpegpbarptophiphi_cutptheta.jpegmanage 52.1 K 11 Dec 2007 - 13:55GeorgSchepers Cut momentum and theta angle
ppbartophiphi.jpegjpegppbartophiphi.jpegmanage 63.8 K 11 Dec 2007 - 13:54GeorgSchepers pbar p to phi phi
psi.gifgifpsi.gifmanage 2.8 K 06 Dec 2007 - 16:20GeorgSchepers Angle 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.gifgifl.gifmanage 1.9 K 06 Dec 2007 - 16:18GeorgSchepers Pathlength of a partice in the radiator of the barrel
nphotonp.gifgifnphotonp.gifmanage 4.0 K 06 Dec 2007 - 16:13GeorgSchepers Number of measured Cherenkov photons
nphotonsdetected_plot.gifgifnphotonsdetected_plot.gifmanage 16.1 K 07 Dec 2007 - 17:35GeorgSchepers Detected Cherenkov photons
nsigma.gifgifnsigma.gifmanage 2.5 K 06 Dec 2007 - 16:12GeorgSchepers Number of sigma
nsigma_p_plot.gifgifnsigma_p_plot.gifmanage 3.4 K 07 Dec 2007 - 17:38GeorgSchepers Number of sigma in dependence of momentum p
nsigma_p_theta_2000-4000.gifgifnsigma_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
nsigma_p_theta_500-5000.gifgifnsigma_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
pathlength_thetapsi_plot.gifgifpathlength_thetapsi_plot.gifmanage 12.9 K 07 Dec 2007 - 14:27GeorgSchepers Pathlength
psi.gifgifpsi.gifmanage 2.8 K 06 Dec 2007 - 16:20GeorgSchepers Angle psi
separationpower.gifgifseparationpower.gifmanage 3.4 K 29 Nov 2007 - 16:17GeorgSchepers Separation power versus momentum

 
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