chigen Namespace Reference

Namespaces
	evtgen
	models
	ostreams
	pythia
	random

Classes
class	ChiGen
class	ChiGenRandomEngine
class	PartonicModel
class	PndChiGen
class	PndChiGenExclusive
class	PythiaChiGen

Functions
double	elapsedTimeSeconds ()
void	ensure_chigen_is_initialized ()
void	initialize ()
void	initialize (long seed)
long	get_seed ()
EvtId	pdgId2EvtId (int pdgId)
bool	isPWaveCharmonia (int pdgCode)
bool	isCharmonia (int pdgCode)

Function Documentation

double chigen::elapsedTimeSeconds

(

)

Elapsed time in seconds

Returns

elapsed time in seconds

Definition at line 23 of file ChiGenContext.cxx.

References __millisecondsTime__.

                                {
        static const double start = (double) __millisecondsTime__;
        return ((__millisecondsTime__ - start) / 1e3);
    }

void chigen::ensure_chigen_is_initialized

(

)

Ensures that all required stuff is loaded and loads otherwise.

Definition at line 211 of file ChiGenContext.cxx.

References initialize().

Referenced by chigen::ChiGen::ChiGen(), chigen::models::createSpinDensity(), chigen::PartonicModel::PartonicModel(), chigen::PndChiGen::PndChiGen(), chigen::PndChiGenExclusive::PndChiGenExclusive(), and chigen::PythiaChiGen::PythiaChiGen().

                                        {
        if (!chigen_is_initialized)
            initialize();
    }

long chigen::get_seed

(

)

Returns random seed which was set at initialization

Returns

random seed that was set at initialization

Definition at line 246 of file ChiGenContext.cxx.

                    {
        return __seed__;
    };

void chigen::initialize

(

)

Initialize ChiGen with default seed (

gRandom->GetSeed() 

).

Definition at line 216 of file ChiGenContext.cxx.

Referenced by ensure_chigen_is_initialized(), main(), and simInclusive().

                      {
        initialize((long) gRandom->GetSeed());
    }

void chigen::initialize

(

long

seed

)

Initialize ChiGen with specified seed.

Parameters

seed

seed

Definition at line 220 of file ChiGenContext.cxx.

References __chigen_cout__, __chigen_direct_cout__, chigen::evtgen::initialize_evtgen(), chigen::pythia::initialize_pythia(), chigen::random::initialize_random(), chigen::ostreams::initialize_streams(), and seed.

                               {
        chigen_is_initialized = true;

        __seed__ = seed;

        //initializing streams
        ostreams::initialize_streams();

        __chigen_cout__ << " Initializing with seed " << __seed__ << "." << std::endl;

        //initializing random 
        srand(seed); //<-to ensure that std::random will use same seed
        random::initialize_random();

        __chigen_cout__ << " Initializing EvtGen ...";
        //initializing EvtGen
        evtgen::initialize_evtgen();
        __chigen_direct_cout__ << "done." << std::endl;

        __chigen_cout__ << " Initializing Pythia ...";
        //initializing Pythia
        pythia::initialize_pythia();
        __chigen_direct_cout__ << "done." << std::endl;

    };

bool chigen::isCharmonia

(

int

pdgCode

)

Returns true, if specified PDG code corresponds to charmonia

Parameters

pdgCode

PDG code

Returns

true, if specified PDG code corresponds to charmonia

Definition at line 268 of file ChiGenContext.cxx.

References CHI1_PDG_ID, CHI2_PDG_ID, PSI_PDG_ID, and X3872_PDG_ID.

Referenced by chigen::PythiaChiGen::decay().

                                  {
        return pdgCode == CHI1_PDG_ID || pdgCode == CHI2_PDG_ID 
                || pdgCode == X3872_PDG_ID || pdgCode == PSI_PDG_ID;
    };

bool chigen::isPWaveCharmonia

(

int

pdgCode

)

Returns true, if specified PDG code corresponds to P-wave charmonia

Parameters

pdgCode

PDG code

Returns

true, if specified PDG code corresponds to P-wave charmonia

Definition at line 264 of file ChiGenContext.cxx.

References CHI1_PDG_ID, CHI2_PDG_ID, and X3872_PDG_ID.

                                       {
        return pdgCode == CHI1_PDG_ID || pdgCode == CHI2_PDG_ID || pdgCode == X3872_PDG_ID;
    };

EvtId chigen::pdgId2EvtId

(

int

pdgId

)

Returns EvtGen particle id from its pdg code

Parameters

pdgId

PDG code

Returns

EvtGen particle id from its pdg code

Definition at line 250 of file ChiGenContext.cxx.

References CHI1_PDG_ID, CHI2_PDG_ID, chigen::evtgen::chi_c1_evt_id, chigen::evtgen::chi_c2_evt_id, chigen::evtgen::ensure_evt_gen_is_inialized(), chigen::evtgen::x3872_evt_id, and X3872_PDG_ID.

                                 {
        evtgen::ensure_evt_gen_is_inialized();
        switch (pdgId) {
            case CHI1_PDG_ID:
                return evtgen::chi_c1_evt_id;
            case CHI2_PDG_ID:
                return evtgen::chi_c2_evt_id;
            case X3872_PDG_ID:
                return evtgen::x3872_evt_id;
            default:
                throw std::runtime_error(std::string("Unknown particle id: ") + toString(pdgId));
        }
    }