| PndBoxGenerator [message #4298] |
Tue, 22 May 2007 18:59  |
StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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first-grade participant |
From: *physik.uni-giessen.de
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After some discussions I wrote a new box generator inside pgenerators directory: PndBoxGenerator.
PndBoxGenerator is like CbmBoxGenerator, but I put one function in order to set uniform distributions in cos(theta), and not in theta as it is done by default.
Example:
If you want to have a unifor distribution i theta, you have to type in your simulation macro:
PndBoxGenerator* boxGen = new PndBoxGenerator(13, 1);
boxGen->SetPRange(1.,1.); // GeV/c
boxGen->SetPhiRange(0., 360.); // Azimuth angle range [degree]
boxGen->SetThetaRange(0., 180.); // Polar angle in lab system range [degree]
boxGen->SetXYZ(0., 0., 0.); // vertex coordinates [cm]
primGen->AddGenerator(boxGen);
IF you want to have a unifor distribution in cos(theta):
PndBoxGenerator* boxGen = new PndBoxGenerator(13, 1);
boxGen->SetPRange(1.,1.); // GeV/c
boxGen->SetPhiRange(0., 360.); // Azimuth angle range [degree]
boxGen->SetThetaRange(0., 180.); // Polar angle in lab system range [degree]
boxGen->SetCosTheta(); // Set uniform ditribution in cos(theta)
boxGen->SetXYZ(0., 0., 0.); // vertex coordinates [cm]
primGen->AddGenerator(boxGen);
And that's all.
Enjoy...
Ste
[Updated on: Fri, 20 July 2007 13:51] Report message to a moderator |
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| Re: PndBoxGenerator -> distributions uniform in 1/p [message #4721 is a reply to message #4299] |
Fri, 20 July 2007 13:59  |
StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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first-grade participant |
From: *physik.uni-giessen.de
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Hello,
I added in PndBoxGenerator a new option, in order to have distributions uniform in 1/p (sometimes is can be useful).
It works as the CosTheta function, so (example):
PndBoxGenerator* boxGen = new PndBoxGenerator(13, 1);
boxGen->SetPRange(0.1,15.);
boxGen->SetPhiRange(0., 360.);
boxGen->SetThetaRange(1., 12.);
boxGen->SetXYZ(0., 0., 0.);
primGen->AddGenerator(boxGen);
generates particles with a uniform distribution opver p in the fixed range, while if you add the boxGen->SetInverseP() function:
PndBoxGenerator* boxGen = new PndBoxGenerator(13, 1);
boxGen->SetPRange(0.1,15.);
boxGen->SetInverseP();
boxGen->SetPhiRange(0., 360.);
boxGen->SetThetaRange(1., 12.);
boxGen->SetXYZ(0., 0., 0.);
primGen->AddGenerator(boxGen);
you will have a distribution in the same range BUT uniform in 1/p. It works even with pt range (so uniform in 1/pt).
Enjoy.
P.S. meanwhile I corrected a missing initialization in the constructor, ad sone for CbmBoxGenerator.
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