git://git.uio.no / u / mrichter / AliRoot.git / blame
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1 | /////////////////////////////////////////////////////////////////////////// |
| 2 | // | |
| 3 | // Copyright 2010 | |
| 4 | // | |
| 5 | // This file is part of starlight. | |
| 6 | // | |
| 7 | // starlight is free software: you can redistribute it and/or modify | |
| 8 | // it under the terms of the GNU General Public License as published by | |
| 9 | // the Free Software Foundation, either version 3 of the License, or | |
| 10 | // (at your option) any later version. | |
| 11 | // | |
| 12 | // starlight is distributed in the hope that it will be useful, | |
| 13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 | // GNU General Public License for more details. | |
| 16 | // | |
| 17 | // You should have received a copy of the GNU General Public License | |
| 18 | // along with starlight. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | // | |
| 20 | /////////////////////////////////////////////////////////////////////////// | |
| 21 | // | |
| 22 | // File and Version Information: | |
| 23 | // $Rev:: 164 $: revision of last commit | |
| 24 | // $Author:: odjuvsla $: author of last commit | |
| 25 | // $Date:: 2013-10-06 16:18:08 +0200 #$: date of last commit | |
| 26 | // | |
| 27 | // Description: | |
| 28 | // | |
| 29 | // | |
| 30 | // | |
| 31 | /////////////////////////////////////////////////////////////////////////// | |
| 32 | ||
| 33 | ||
| 34 | #include <iostream> | |
| 35 | #include <fstream> | |
| 36 | #include <cmath> | |
| 37 | ||
| 38 | #include "psifamily.h" | |
| 39 | ||
| 40 | ||
| 41 | using namespace std; | |
| 42 | ||
| 43 | ||
| 44 | psiFamily::psiFamily(beamBeamSystem& bbsystem):Gammaanarrowvm(bbsystem) | |
| 45 | { | |
| 46 | //Defining _width and mass... | |
| 47 | ||
| 48 | ||
| 49 | // switch(input.prodParticleType()){ | |
| 50 | // case starlightConstants::JPSI: | |
| 51 | // cout << "JPSI goddamnit!" << endl; | |
| 52 | // _width=0.000091; | |
| 53 | // mass=3.09692; | |
| 54 | // break; | |
| 55 | // case starlightConstants::JPSI2S: | |
| 56 | // _width=0.000337; | |
| 57 | // mass=3.686093; | |
| 58 | // break; | |
| 59 | // default: cout<<"This PSI Family Member Has Not Been Defined, psiFamily::psiFamily()"<<endl; | |
| 60 | // } | |
| 61 | ||
| 62 | } | |
| 63 | ||
| 64 | ||
| 65 | psiFamily::~psiFamily() | |
| 66 | { } | |
| 67 | ||
| 68 | ||
| 69 | double psiFamily::getTheta(starlightConstants::particleTypeEnum) | |
| 70 | { | |
| 71 | //should probably merge the psi fmaily back to the vm stuff. | |
| 72 | ||
| 73 | //This depends on the decay angular distribution | |
| 74 | //Valid for J/Psi, Psi(2s)? | |
| 75 | //cout<<"Psi family theta"<<endl; | |
| 76 | double theta=0.; | |
| 77 | double xtest=0.; | |
| 78 | double dndtheta=0.; | |
| 79 | L200td: | |
| 80 | theta = starlightConstants::pi*randyInstance.Rndom();//random()/(RAND_MAX+1.0); | |
| 81 | xtest = randyInstance.Rndom();//random()/(RAND_MAX+1.0); | |
| 82 | // Follow distribution for helicity +/-1 | |
| 83 | // Eq. 19 of J. Breitweg et al., Eur. Phys. J. C2, 247 (1998)//Does Not Apply for J/psi? | |
| 84 | // SRK 11/14/2000 | |
| 85 | ||
| 86 | dndtheta = sin(theta)*(1.+((cos(theta))*(cos(theta)))); | |
| 87 | if(xtest > dndtheta) | |
| 88 | goto L200td; | |
| 89 | return theta; | |
| 90 | } | |
| 91 | ||
| 92 | ||
| 93 | double psiFamily::getDaughterMass(starlightConstants::particleTypeEnum &ipid) | |
| 94 | { | |
| 95 | double ytest=0.,mdec=0.; | |
| 96 | // decays 50% to e+/e-, 50% to mu+/mu- | |
| 97 | ytest = randyInstance.Rndom();//random()/(RAND_MAX+1.0); | |
| 98 | if(ytest >= 0.5) | |
| 99 | { | |
| 100 | mdec = starlightConstants::mel; | |
| 101 | ipid = starlightConstants::ELECTRON; | |
| 102 | } | |
| 103 | else | |
| 104 | { | |
| 105 | mdec = starlightConstants::muonMass; | |
| 106 | ipid = starlightConstants::MUON; | |
| 107 | } | |
| 108 | return mdec; | |
| 109 | } |