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eventchannel.cpp
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///////////////////////////////////////////////////////////////////////////
//
// Copyright 2010
//
// This file is part of starlight.
//
// starlight is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// starlight is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with starlight. If not, see <http://www.gnu.org/licenses/>.
//
///////////////////////////////////////////////////////////////////////////
//
// File and Version Information:
// $Rev:: 255 $: revision of last commit
// $Author:: jnystrand $: author of last commit
// $Date:: 2016-04-06 14:01:46 +0100 #$: date of last commit
//
// Description:
// Class needed for root output
//
//
///////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <fstream>
#include <cmath>
#include "eventchannel.h"
using namespace std;
//______________________________________________________________________________
eventChannel::eventChannel(const inputParameters& inputParametersInstance, beamBeamSystem& bbsystem)
: readLuminosity(inputParametersInstance),
_bbs(bbsystem),
_nmbAttempts(0),
_nmbAccepted(0),
_totalChannelCrossSection(0)
{
_ptCutEnabled = inputParametersInstance.ptCutEnabled();
_ptCutMin = inputParametersInstance.ptCutMin();
_ptCutMax = inputParametersInstance.ptCutMax();
_etaCutEnabled = inputParametersInstance.etaCutEnabled();
_etaCutMin = inputParametersInstance.etaCutMin();
_etaCutMax = inputParametersInstance.etaCutMax();
_randy.SetSeed(inputParametersInstance.randomSeed());
}
//______________________________________________________________________________
eventChannel::~eventChannel()
{ }
//______________________________________________________________________________
void
eventChannel::transform(const double betax,
const double betay,
const double betaz,
double& E,
double& px,
double& py,
double& pz,
int& iFbadevent)
{
// carries out a lorentz transform of the frame. (Not a boost!)???
const double E0 = E;
const double px0 = px;
const double py0 = py;
const double pz0 = pz;
const double beta = sqrt(betax * betax + betay * betay + betaz * betaz);
if (beta >= 1)
iFbadevent = 1;
const double gamma = 1. / sqrt(1. - beta * beta);
const double gob = (gamma - 1) / (beta * beta);
E = gamma * (E0 - betax * px0 - betay * py0 - betaz* pz0);
px = -gamma * betax * E0 + (1. + gob * betax * betax) * px0
+ gob * betax * betay * py0 + gob * betax * betaz * pz0;
py = -gamma * betay * E0 + gob * betay * betax * px0
+ (1. + gob * betay * betay) * py0 + gob * betay * betaz *pz0;
pz = -gamma * betaz * E0 + gob * betaz * betax * px0
+ gob * betaz * betay * py0 + (1. + gob * betaz * betaz) * pz0;
}
//______________________________________________________________________________
double
eventChannel::pseudoRapidity(const double px,
const double py,
const double pz)
{
const double pT= sqrt(px * px + py * py);
const double p = sqrt(pz * pz + pT * pT);
double eta = -99.9; // instead of special value, std::numeric_limits<double>::quiet_NaN() should be used
if ((p - pz) != 0)
eta = 0.5 * log((p + pz)/(p - pz));
return eta;
}

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