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//==============================================================================
// Kinematics.h
//
// Copyright (C) 2010-2013 Tobias Toll and Thomas Ullrich
//
// This file is part of Sartre version: 1.1
//
// This program 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.
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
//
// Author: Thomas Ullrich
// Last update:
// $Date: 2013-05-29 21:26:19 +0100 (Wed, 29 May 2013) $
// $Author: thomas.ullrich@bnl.gov $
//==============================================================================
#ifndef Kinematics_h
#define Kinematics_h
#include "Constants.h"
#include "Settings.h"
#include "TLorentzVector.h"
class Kinematics {
public:
static double xprobe(double Q2, double W2, double vmM);
static TLorentzVector electronBeam(double eE);
static TLorentzVector hadronBeam(double eH);
static double s(const TLorentzVector& e, const TLorentzVector& p);
static double s(double eE, double hE);
static double x(double Q2, double W2);
static double y(double Q2, double x, double s);
static double ymin(double s, double vmM);
static double ymax(double s, double vmM);
static double W2(double Q2, double x);
static double W2(double Q2, double xprobe, double vmM);
static double W2min(double vmM);
static double W2max(double s);
static double Q2min(double y);
static double Q2max(double s);
static double xpomeron(double t, double Q2, double W2, double vmM);
static double tmax(double xpom); // often referred to as tmin implying min |T|
static double tmax(double t, double Q2, double W2, double vmM);
static double tmin(double hE); // the smallest t value possible
static bool valid(double s, double t, double Q2, double W2, double vmMass,
bool useTrueXp = false,
bool verbose = false);
static bool error();
private:
static bool mError;
};
#endif

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