file src/decay_table.cpp
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Detailed Description
Author: Pat Scott (patscott@physics.mcgill.ca)
Date: 2015 Jan
Decay table class definitions.
Authors (add name and date if you modify):
Source code
// GAMBIT: Global and Modular BSM Inference Tool
// *********************************************
/// \file
///
/// Decay table class definitions.
///
/// *********************************************
///
/// Authors (add name and date if you modify):
///
/// \author Pat Scott
/// (patscott@physics.mcgill.ca)
/// \date 2015 Jan
///
/// *********************************************
#include <fstream>
#include "gambit/Elements/decay_table.hpp"
#include "gambit/Elements/mssm_slhahelp.hpp"
#include "gambit/Utils/util_functions.hpp"
#include "gambit/Utils/version.hpp"
#include "gambit/Utils/file_lock.hpp"
#include <boost/lexical_cast.hpp>
#include <boost/assign.hpp>
namespace Gambit
{
// Local helper functions
void get_calculator_info(const SLHAstruct& slha, str& calculator, str& calculator_version)
{
auto dcinfo = slha.find("DCINFO");
if (dcinfo != slha.end())
{
if (dcinfo->size() > 1)
{
for (unsigned int i = 1; i < dcinfo->at(1).size(); ++i)
{
str s(dcinfo->at(1).at(i));
if (s[0] != '#') calculator += s;
}
}
if (dcinfo->size() > 2)
{
for (unsigned int i = 1; i < dcinfo->at(2).size(); ++i)
{
str s(dcinfo->at(2).at(i));
if (s[0] != '#') calculator_version += s;
}
}
}
}
// DecayTable methods
/// Create a DecayTable from an SLHA file
DecayTable::DecayTable(str slha, int context, bool force_SM_fermion_gauge_eigenstates)
: DecayTable(read_SLHA(slha), context, force_SM_fermion_gauge_eigenstates)
{}
/// Create a DecayTable from an SLHA file, with PDG code remapping
DecayTable::DecayTable(str slha, const std::map<int, int>& PDG_map, int context, bool force_SM_fermion_gauge_eigenstates)
: DecayTable(read_SLHA(slha), PDG_map, context, force_SM_fermion_gauge_eigenstates)
{}
/// Create a DecayTable from an SLHAea object containing DECAY blocks
DecayTable::DecayTable(const SLHAstruct& slha, int context, bool force_SM_fermion_gauge_eigenstates)
{
// Extract the calculator info if it exists
str calculator, calculator_version;
get_calculator_info(slha, calculator, calculator_version);
// Iterate over all blocks in the file, ignoring everything except DECAY blocks
for (auto block = slha.begin(); block != slha.end(); ++block)
{
auto block_def = block->find_block_def();
if (block_def != block->end())
{
if(block_def->at(0) == "DECAY")
{
// Make sure the block definition has the particle's width and PDG code
if (block_def->size() < 3) utils_error().raise(LOCAL_INFO,
"SLHAea object has DECAY block with < 3 entries in its block definition.");
int pdg = SLHAea::to<int>(block_def->at(1));
// Add an entry containing the info in this block
int local_context = context;
if (force_SM_fermion_gauge_eigenstates)
{
int abspdg = std::abs(pdg);
// Select SM fermions, including 4th gen, and force gauge eigenstates (context = 1).
if (abspdg < 19 and abspdg != 9 and abspdg != 10) local_context = 1;
}
operator()(std::pair<int,int>(pdg,local_context)) = Entry(*block, block_def, context,
force_SM_fermion_gauge_eigenstates, calculator, calculator_version);
}
}
}
}
/// Create a DecayTable from an SLHAea object containing DECAY blocks, and remap PDG codes according to provided map
DecayTable::DecayTable(const SLHAstruct& slha_in, const std::map<int, int>& PDG_map, int context, bool force_SM_fermion_gauge_eigenstates)
{
// Make a local copy so we can mess with it
SLHAstruct slha(slha_in);
// Extract the calculator info if it exists
str calculator, calculator_version;
get_calculator_info(slha, calculator, calculator_version);
// Iterate over all blocks in the file, ignoring everything except DECAY blocks
for (auto block = slha.begin(); block != slha.end(); ++block)
{
auto block_def = block->find_block_def();
if (block_def != block->end())
{
if(block_def->at(0) == "DECAY")
{
// Make sure the block definition has the particle's width and PDG code
if (block_def->size() < 3) utils_error().raise(LOCAL_INFO, "SLHAea object has DECAY block with < 3 entries in its block definition.");
int pdg = SLHAea::to<int>(block_def->at(1));
if (PDG_map.find(pdg) != PDG_map.end())
{
pdg = PDG_map.at(pdg);
(*block_def)[1] = boost::lexical_cast<str>(pdg);
}
// Step through the block and convert any final state PDG codes that need to be remapped
for (auto line = block->begin() + 1; line != block->end(); ++line)
{
if (not line->is_comment_line())
{
for (int i = 2; i < 2 + SLHAea::to<int>(line->at(1)); i++)
{
int local_pdg = SLHAea::to<int>(line->at(i));
if (PDG_map.find(local_pdg) != PDG_map.end()) (*line)[i] = boost::lexical_cast<str>(PDG_map.at(local_pdg));
}
}
}
// Add an entry containing the info in this block
operator()(std::pair<int,int>(pdg,context)) = Entry(*block, block_def, context,
force_SM_fermion_gauge_eigenstates, calculator, calculator_version);
}
}
}
}
/// Output entire decay table as an SLHA file full of DECAY blocks
void DecayTable::writeSLHAfile(int SLHA_version, const str& filename, bool include_zero_bfs, const mass_es_pseudonyms& psn) const
{
Utils::FileLock mylock(filename);
mylock.get_lock();
std::ofstream ofs(filename);
ofs << getSLHAea(SLHA_version, include_zero_bfs, psn);
ofs.close();
mylock.release_lock();
}
/// Output entire decay table as an SLHAea file full of DECAY blocks
SLHAstruct DecayTable::getSLHAea(int SLHA_version, bool include_zero_bfs, const mass_es_pseudonyms& psn) const
{
SLHAstruct slha;
std::map<str, std::set<str> > calculator_map;
str calculators = "GAMBIT, using: ";
str versions = gambit_version() + ": ";
// Add the decay info
for (auto particle = particles.begin(); particle != particles.end(); ++particle)
{
auto entry = particle->second;
if (entry.calculator != "") calculator_map[entry.calculator].insert(entry.calculator_version);
slha.push_back(entry.getSLHAea_block(SLHA_version, particle->first, include_zero_bfs, psn));
}
// Construct the calculator info
for (auto be = calculator_map.begin(); be != calculator_map.end(); ++be)
{
if (be != calculator_map.begin())
{
calculators += " | ";
versions += " | ";
}
calculators += be->first;
for (auto ver = be->second.begin(); ver != be->second.end(); ++ver)
{
if (*ver != "")
{
if (ver != be->second.begin()) versions += ", ";
versions += *ver;
}
}
}
// Add the calculator info
SLHAea::Block DCblock("DCINFO");
DCblock.push_back("BLOCK DCINFO # Decay Program information");
SLHAea::Line line1, line2;
line1 << 1 << calculators << "# Decay calculators";
line2 << 2 << versions << "# Version numbers";
DCblock.push_back(line1);
DCblock.push_back(line2);
slha.push_front(DCblock);
// Add a disclaimer about the absence of a MODSEL block
slhahelp::add_MODSEL_disclaimer(slha, "DecayTable");
return slha;
}
/// Output a decay table entry as an SLHAea DECAY block
/// @{
SLHAea::Block DecayTable::getSLHAea_block(int v, std::pair<int,int> p, bool z, const mass_es_pseudonyms& psn) const
{ return particles.at(p).getSLHAea_block(v, Models::ParticleDB().long_name(p), z, psn); }
SLHAea::Block DecayTable::getSLHAea_block(int v, str p, bool z, const mass_es_pseudonyms& psn) const
{ return particles.at(Models::ParticleDB().pdg_pair(p)).getSLHAea_block(v, p, z, psn); }
SLHAea::Block DecayTable::getSLHAea_block(int v, str p, int i, bool z, const mass_es_pseudonyms& psn) const
{ return particles.at(Models::ParticleDB().pdg_pair(p,i)).getSLHAea_block(v, Models::ParticleDB().long_name(p,i), z, psn); }
/// @}
// DecayTable::Entry subclass methods
/// Constructor creating a DecayTable Entry from an SLHAea DECAY block; full version
DecayTable::Entry::Entry(const SLHAea::Block& block, int context,
bool force_SM_fermion_gauge_eigenstates, str calc, str calc_ver) :
positive_error(0.0),
negative_error(0.0),
calculator(calc),
calculator_version(calc_ver),
warnings(""),
errors("")
{
auto block_def = block.find_block_def();
if (block_def->at(0) != "DECAY" or block_def->size() < 3)
utils_error().raise(LOCAL_INFO, "SLHAea block is not DECAY or has < 3 entries in its block definition.");
width_in_GeV = SLHAea::to<double>(block_def->at(2));
init(block, context, force_SM_fermion_gauge_eigenstates);
}
/// Constructor creating a DecayTable Entry from an SLHAea DECAY block; full version;
/// version assuming block def is already known
DecayTable::Entry::Entry(const SLHAea::Block& block, SLHAea::Block::const_iterator block_def,
int context, bool force_SM_fermion_gauge_eigenstates, str calc, str calc_ver) :
width_in_GeV (SLHAea::to<double>(block_def->at(2))),
positive_error(0.0),
negative_error(0.0),
calculator(calc),
calculator_version(calc_ver),
warnings(""),
errors("")
{
init(block, context, force_SM_fermion_gauge_eigenstates);
}
/// Initialise a DecayTable Entry using an SLHAea DECAY block
void DecayTable::Entry::init(const SLHAea::Block& block, int context, bool force_SM_fermion_gauge_eigenstates)
{
for (auto channel = block.begin(); channel != block.end(); ++channel)
{
str first_entry(channel->at(0));
if (first_entry != "DECAY" and first_entry[0] != '#')
{
if (channel->size() < 4) utils_error().raise(LOCAL_INFO, "SLHAea DECAY block line has < 4 entries!");
double BF = SLHAea::to<double>(first_entry);
int n_daughters = SLHAea::to<int>(channel->at(1));
std::vector<std::pair<int,int> > daughter_pdg_codes;
for (int i = 2; i < n_daughters+2; ++i)
{
int pdg = SLHAea::to<int>(channel->at(i));
int context_local = context;
if (force_SM_fermion_gauge_eigenstates)
{
int abspdg = std::abs(pdg);
// Select SM fermions, including 4th gen, and force gauge eigenstates (context = 1).
if (abspdg < 19 and abspdg != 9 and abspdg != 10) context_local = 1;
}
std::pair<int,int> pdg_pair(pdg, context_local);
daughter_pdg_codes.push_back(pdg_pair);
}
set_BF(BF, 0.0, daughter_pdg_codes);
}
}
}
/// Make sure all particles listed in a set are actually known to the GAMBIT particle database
void DecayTable::Entry::check_particles_exist(std::multiset< std::pair<int,int> >& particles) const
{
for (auto final_state = particles.begin(); final_state != particles.end(); ++final_state)
{
if (not Models::ParticleDB().has_particle(*final_state))
{
std::ostringstream err;
err << "Particle with PDG code" << final_state->first << " and context integer " << endl
<< final_state->second << " is not in the in GAMBIT particle database." << endl
<< "Please add such a particle to Models/src/particle_database.cpp and recompile.";
model_error().raise(LOCAL_INFO,err.str());
}
}
}
/// Make sure no NaNs have been passed to the DecayTable by nefarious backends
void DecayTable::Entry::check_BF_validity(double BF, double error, std::multiset< std::pair<int,int> >& key) const
{
if (Utils::isnan(BF) or Utils::isnan(error))
{
std::ostringstream msg;
msg << "NaN detected in attempt to set decay table branching fraction. " << endl
<< "Final states are: " << endl;
for(auto it = key.begin(); it !=key.end(); ++it)
{
msg << " " << Models::ParticleDB().long_name(*it) << endl;
}
msg << "BF: " << BF << endl << "error: " << error << endl;
msg << "Total width (GeV): " << width_in_GeV << " +" << positive_error << " -" << negative_error << endl;
msg << "Decay calculator: " << calculator << " " << calculator_version;
utils_error().raise(LOCAL_INFO, msg.str());
}
}
/// Set branching fraction for decay to a given final state. 1. PDG-context integer pairs (vector)
void DecayTable::Entry::set_BF(double BF, double error, const std::vector<std::pair<int,int> >& daughters)
{
std::multiset< std::pair<int,int> > key(daughters.begin(), daughters.end());
check_particles_exist(key);
check_BF_validity(BF, error, key);
channels[key] = std::pair<double, double>(BF, error);
}
/// Set branching fraction for decay to a given final state. 2. full particle names (vector)
void DecayTable::Entry::set_BF(double BF, double error, const std::vector<str>& daughters)
{
std::multiset< std::pair<int,int> > key;
for (auto p = daughters.begin(); p != daughters.end(); ++p) key.insert(Models::ParticleDB().pdg_pair(*p));
check_particles_exist(key);
check_BF_validity(BF, error, key);
channels[key] = std::pair<double, double>(BF, error);
}
/// Check if a given final state exists in this DecayTable::Entry. 1. PDG-context integer pairs (vector)
bool DecayTable::Entry::has_channel(const std::vector<std::pair<int,int> >& daughters) const
{
std::multiset< std::pair<int,int> > key(daughters.begin(), daughters.end());
check_particles_exist(key);
return channels.find(key) != channels.end();
}
/// Check if a given final state exists in this DecayTable::Entry. 2. full particle names (vector)
bool DecayTable::Entry::has_channel(const std::vector<str>& daughters) const
{
std::multiset< std::pair<int,int> > key;
for (auto p = daughters.begin(); p != daughters.end(); ++p) key.insert(Models::ParticleDB().pdg_pair(*p));
check_particles_exist(key);
return channels.find(key) != channels.end();
}
/// Retrieve branching fraction for decay to a given final state. 1. PDG-context integer pairs (vector)
double DecayTable::Entry::BF(const std::vector<std::pair<int, int> >& daughters) const
{
std::multiset< std::pair<int,int> > key(daughters.begin(), daughters.end());
check_particles_exist(key);
return channels.at(key).first;
}
/// Retrieve branching fraction for decay to a given final state. 2. full particle names (vector)
double DecayTable::Entry::BF(const std::vector<str>& daughters) const
{
std::multiset< std::pair<int,int> > key;
for (auto p = daughters.begin(); p != daughters.end(); ++p) key.insert(Models::ParticleDB().pdg_pair(*p));
check_particles_exist(key);
return channels.at(key).first;
}
/// Output a decay table entry as an SLHAea DECAY block
/// @{
SLHAea::Block DecayTable::Entry::getSLHAea_block(int v, str p, bool z, const mass_es_pseudonyms& psn) const
{ return getSLHAea_block(v, Models::ParticleDB().pdg_pair(p), z, psn); }
SLHAea::Block DecayTable::Entry::getSLHAea_block(int v, str p, int i, bool z, const mass_es_pseudonyms& psn) const
{ return getSLHAea_block(v, Models::ParticleDB().pdg_pair(p,i), z, psn); }
SLHAea::Block DecayTable::Entry::getSLHAea_block(int v, std::pair<int,int> p, bool include_zero_bfs, const mass_es_pseudonyms& psn) const
{
const std::map<str, int> slha1_pdgs = boost::assign::map_list_of
("~t_1" , 1000006)
("~t_2" , 2000006)
("~b_1" , 1000005)
("~b_2" , 2000005)
("~tau_1" , 1000015)
("~tau_2" , 2000015)
("~nu_e_L" , 1000012)
("~nu_mu_L" , 1000014)
("~nu_tau_L", 1000016)
("~d_L" , 1000001)
("~s_L" , 1000003)
("~d_R" , 2000001)
("~s_R" , 2000003)
("~e_L" , 1000011)
("~mu_L" , 1000013)
("~e_R" , 2000011)
("~mu_R" , 2000013)
("~u_L" , 1000002)
("~c_L" , 1000004)
("~u_R" , 2000002)
("~c_R" , 2000004)
("~tbar_1" , -1000006)
("~tbar_2" , -2000006)
("~bbar_1" , -1000005)
("~bbar_2" , -2000005)
("~taubar_1" , -1000015)
("~taubar_2" , -2000015)
("~nu_ebar_L" , -1000012)
("~nu_mubar_L" , -1000014)
("~nu_taubar_L", -1000016)
("~dbar_L" , -1000001)
("~sbar_L" , -1000003)
("~dbar_R" , -2000001)
("~sbar_R" , -2000003)
("~ebar_L" , -1000011)
("~mubar_L" , -1000013)
("~ebar_R" , -2000011)
("~mubar_R" , -2000013)
("~ubar_L" , -1000002)
("~cbar_L" , -1000004)
("~ubar_R" , -2000002)
("~cbar_R" , -2000004);
// Make sure the particle actually exists in the database
if (not Models::ParticleDB().has_particle(p))
{
std::stringstream ss;
ss << "GAMBIT particle database does not have particle with (PDG,context) codes (" << p.first << "," << p.second << ").";
utils_error().raise(LOCAL_INFO, ss.str());
}
// Add the info about the decay in general
int pdg = p.first;
str long_name = Models::ParticleDB().long_name(p);
SLHAea::Line line;
if (v == 1)
{
if (not psn.filled) utils_error().raise(LOCAL_INFO, "Non-empty mass_es_pseudonyms must be provided for SLHA1 DecayTable output.");
if (psn.gauge_family_eigenstates.find(long_name) != psn.gauge_family_eigenstates.end())
{
long_name = psn.gauge_family_eigenstates.at(long_name);
pdg = slha1_pdgs.at(long_name);
}
}
else if (v != 2) utils_error().raise(LOCAL_INFO, "Unrecognised SLHA version requested. Expected 1 or 2.");
line << "DECAY" << pdg << this->width_in_GeV << "# " + long_name + " decays";
SLHAea::Block block(std::to_string(p.first));
block.push_back(line);
block.insert(block.begin(),SLHAea::Line("# PDG Width (GeV)"));
block.push_back("# BF NDA Daughter PDG codes");
// Add the branching fraction and daughter particle PDG codes for each decay channel
for (auto channel = channels.begin(); channel != channels.end(); ++channel)
{
// Skip this channel if its BF is NaN (undefined) or zero (on request)
double BF = (channel->second).first;
if (not Utils::isnan(BF))
{
if (BF > 0.0 or include_zero_bfs)
{
auto daughters = channel->first;
str comment = "# BF(" + long_name + " --> ";
line.clear();
// Get the branching fraction and number of particles in the final state
line << BF << daughters.size();
// Get the PDG code for each daughter particle
for (auto daughter = daughters.begin(); daughter != daughters.end(); ++daughter)
{
int daughter_pdg = daughter->first;
str daughter_long_name = Models::ParticleDB().long_name(*daughter);
if (v == 1)
{
if (psn.gauge_family_eigenstates.find(daughter_long_name) != psn.gauge_family_eigenstates.end())
{
daughter_long_name = psn.gauge_family_eigenstates.at(daughter_long_name);
daughter_pdg = slha1_pdgs.at(daughter_long_name);
}
}
line << daughter_pdg;
comment += daughter_long_name + " ";
}
comment[comment.size()-1] = ')';
line << comment;
block.push_back(line);
}
}
}
return block;
}
/// @}
/// Get entry in decay table for a given particle, adding the particle to the table if it is absent.
/// Three access methods: PDG-context integer pair, full particle name, short particle name + index integer.
/// @{
DecayTable::Entry& DecayTable::operator()(std::pair<int,int> p) { return particles[p]; }
DecayTable::Entry& DecayTable::operator()(str p) { return particles[Models::ParticleDB().pdg_pair(p)]; }
DecayTable::Entry& DecayTable::operator()(str p, int i) { return particles[Models::ParticleDB().pdg_pair(p,i)]; }
const DecayTable::Entry& DecayTable::operator()(std::pair<int,int> p) const { return particles.at(p); }
const DecayTable::Entry& DecayTable::operator()(str p) const { return particles.at(Models::ParticleDB().pdg_pair(p)); }
const DecayTable::Entry& DecayTable::operator()(str p, int i) const { return particles.at(Models::ParticleDB().pdg_pair(p,i)); }
/// @}
/// Get entry in decay table for a give particle, throwing an error if particle is absent.
/// Three access methods: PDG-context integer pair, full particle name, short particle name + index integer.
/// @{
DecayTable::Entry& DecayTable::at(std::pair<int,int> p) { return particles.at(p); }
DecayTable::Entry& DecayTable::at(str p) { return particles.at(Models::ParticleDB().pdg_pair(p)); }
DecayTable::Entry& DecayTable::at(str p, int i) { return particles.at(Models::ParticleDB().pdg_pair(p,i)); }
const DecayTable::Entry& DecayTable::at(std::pair<int,int> p) const { return particles.at(p); }
const DecayTable::Entry& DecayTable::at(str p) const { return particles.at(Models::ParticleDB().pdg_pair(p)); }
const DecayTable::Entry& DecayTable::at(str p, int i) const { return particles.at(Models::ParticleDB().pdg_pair(p,i)); }
/// @}
/// Sum up the branching fractions for a single particle's entry and return the result.
double DecayTable::Entry::sum_BF() const
{
double sum = 0.0;
for (auto channel = channels.begin(); channel != channels.end(); ++channel)
{
sum += (channel->second).first;
}
return sum;
}
}
Updated on 2024-07-18 at 13:53:34 +0000