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CheckId.h
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// -*- C++ -*-
//
// CheckId.h is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2011 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
//
#ifndef HERWIG_CheckId_H
#define HERWIG_CheckId_H
//
// This is the declaration of the CheckId class.
#include "ThePEG/PDT/StandardMatchers.h"
#include "ThePEG/PDT/ParticleData.h"
#include <ThePEG/PDT/EnumParticles.h>
#include "ThePEG/Repository/CurrentGenerator.h"
namespace Herwig {
using namespace ThePEG;
/** \ingroup Hadronization
*
* This is a pure static class which provides some useful methods
* for checking the PDG id of particles.
* Notice that the name "quark" in the methods below means any of
* the following:
* d , u , s , c , b anti-d , anti-u , anti-s , anti-c , anti-b
* that is we do not distinguish between particle or antiparticle
* ( because can be done directly by the user:
* id > 0 for particles ; id < 0 for anti-particles )
* and we do not include t (and anti-t ) because we are interested
* in components of mesons and baryons.
* Similarly for the name "diquark" which include all diquarks (id > 0)
* and anti-diquarks (id < 0) not made with t ( anti-t ) component.
*
* NB) For Other useful methods (even some implemented in CheckId class!)
* @see StandardMatchers
*/
class CheckId {
public:
/**
* Return the particle data of the diquark (anti-diquark) made by the two
* quarks (antiquarks) par1, par2.
* @param par1 (anti-)quark data pointer
* @param par2 (anti-)quark data pointer
*/
static PDPtr makeDiquark(tcPDPtr par1, tcPDPtr par2) {
long id1 = par1->id();
long id2 = par2->id();
long idnew = makeDiquarkID(id1,id2);
assert(!CurrentGenerator::isVoid());
return CurrentGenerator::current().getParticleData(idnew);
}
/**
* Return the id of the diquark (anti-diquark) made by the two
* quarks (antiquarks) of id specified in input (id1, id2).
* Caller must ensure that id1 and id2 are quarks.
*/
static long makeDiquarkID(long id1, long id2);
/**
* Return true if the two particles in input can be the components of a meson;
*false otherwise.
*/
static bool canBeMeson(tcPDPtr par1,tcPDPtr par2) {
assert(par1 && par2);
long id1 = par1->id();
long id2 = par2->id();
// a Meson must not have any diquarks
if(DiquarkMatcher::Check(id1) || DiquarkMatcher::Check(id2)) return false;
return ( abs(int(par1->iColour()))== 3 &&
abs(int(par2->iColour())) == 3 &&
id1*id2 < 0);
}
/**
* Return true if the two or three particles in input can be the components
* of a baryon; false otherwise.
*/
static bool canBeBaryon(tcPDPtr par1, tcPDPtr par2 , tcPDPtr par3 = PDPtr()) {
assert(par1 && par2);
long id1 = par1->id(), id2 = par2->id();
if (!par3) {
if( id1*id2 < 0) return false;
if(DiquarkMatcher::Check(id1))
return abs(int(par2->iColour())) == 3 && !DiquarkMatcher::Check(id2);
if(DiquarkMatcher::Check(id2))
return abs(int(par1->iColour())) == 3;
return false;
}
else {
// In this case, to be a baryon, all three components must be (anti-)quarks
// and with the same sign.
return (par1->iColour() == 3 && par2->iColour() == 3 && par3->iColour() == 3) ||
(par1->iColour() == -3 && par2->iColour() == -3 && par3->iColour() == -3);
}
}
/**
* Return true if the two or three particles in input can be the components
* of a hadron; false otherwise.
*/
static bool canBeHadron(tcPDPtr par1, tcPDPtr par2 , tcPDPtr par3 = PDPtr()) {
return (canBeMeson(par1,par2) && !par3) || canBeBaryon(par1,par2,par3);
}
/**
* Return true if any of the possible three input particles has
* b-flavour;
* false otherwise. In the case that only the first particle is specified,
* it can be: an (anti-)quark, an (anti-)diquark
* an (anti-)meson, an (anti-)baryon; in the other cases, each pointer
* is assumed to be either (anti-)quark or (anti-)diquark.
*/
static bool hasBottom(tcPDPtr par1, tcPDPtr par2 = PDPtr(), tcPDPtr par3 = PDPtr());
/**
* Return true if any of the possible three input particles has
* c-flavour;
* false otherwise.In the case that only the first pointer is specified,
* it can be: a (anti-)quark, a (anti-)diquark
* a (anti-)meson, a (anti-)baryon; in the other cases, each pointer
* is assumed to be either (anti-)quark or (anti-)diquark.
*/
static bool hasCharm(tcPDPtr par1, tcPDPtr par2 = PDPtr(), tcPDPtr par3 = PDPtr());
/**
* Return true, if any of the possible input particle pointer is an exotic quark, e.g. Susy quark;
* false otherwise.
*/
static bool isExotic(tcPDPtr par1, tcPDPtr par2 = PDPtr(), tcPDPtr par3 = PDPtr());
private:
/**
* Return true if the particle pointer corresponds to a diquark
* or anti-diquark carrying b flavour; false otherwise.
*/
static bool isDiquarkWithB(tcPDPtr par1) {
if (!par1) return false;
long id1 = par1->id();
return DiquarkMatcher::Check(id1) && (abs(id1)/1000)%10 == ParticleID::b;
}
/**
* Return true if the particle pointer corresponds to a diquark
* or anti-diquark carrying c flavour; false otherwise.
*/
static bool isDiquarkWithC(tcPDPtr par1) {
if (!par1) return false;
long id1 = par1->id();
return ( DiquarkMatcher::Check(id1) &&
( (abs(id1)/1000)%10 == ParticleID::c
|| (abs(id1)/100)%10 == ParticleID::c ) );
}
private:
/**
* Pure static class so default constructor is private
*/
CheckId();
/**
* Pure static class so copy constructor is private
*/
CheckId(const CheckId & x);
/**
* Assignmet is private as static
*/
CheckId & operator=(const CheckId & x);
};
}
#endif /* HERWIG_CheckId_H */

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