#include <scatteractionsfinderparameters.h>

Helper class for ScatterActionsFinder.

ScatterActionsFinder has one member of this class, which just collects general parameters, for easier function argument passing. In practice it is almost a POD structure containing constants defined externally, but allows for methods that depend on simple inputs, such as AQM_scaling_factor.

Definition at line 68 of file scatteractionsfinderparameters.h.

Collaboration diagram for smash::ScatterActionsFinderParameters:

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Public Member Functions
	ScatterActionsFinderParameters (Configuration &config, const ExperimentParameters &parameters)
	Class constructor. More...

double	AQM_scaling_factor (const PdgCode &pdg) const
	AQM scaling factor for a hadron. More...

Public Attributes
const double	elastic_parameter
	Elastic cross section parameter (in mb). More...

const double	low_snn_cut
	Elastic collsions between two nucleons with sqrt_s below low_snn_cut_ are excluded. More...

const double	scale_xs
	Factor by which all (partial) cross sections are scaled. More...

const double	additional_el_xs
	Additional constant contribution (in mb) to the elastic cross sections. More...

const double	maximum_cross_section

const CollisionCriterion	coll_crit
	Specifies which collision criterion is used. More...

const NNbarTreatment	nnbar_treatment
	Switch for NNbar reactions. More...

const ReactionsBitSet	included_2to2
	List of included 2<->2 reactions. More...

const CharmRescattering	charm_rescattering
	Specifies kind of charm rescattering. More...

const MultiParticleReactionsBitSet	included_multi
	List of included multi-particle reactions. More...

const int	testparticles
	Number of test particles. More...

const bool	two_to_one
	Enables resonance production. More...

const bool	allow_collisions_within_nucleus
	If particles within the same nucleus are allowed to collide for their first time. More...

const SpinInteractionType	spin_interaction_type
	Switch to control whether to include spin interactions. More...

const bool	strings_switch
	Indicates whether string fragmentation is switched on. More...

const bool	use_AQM
	Switch to control whether to use AQM or not. More...

const bool	strings_with_probability
	This indicates whether the string fragmentation is swiched on with a probability smoothly increasing with energy. More...

const bool	only_warn_for_high_prob
	Switch to turn off throwing an exception for collision probabilities larger than 1. More...

const StringTransitionParameters	transition_high_energy
	Constants related to transition between low collision energies - mediated via resonances - and high collision energies - mediated via strings. More...

const TotalCrossSectionStrategy	total_xs_strategy
	Method used to evaluate total cross sections for collision finding. More...

const PseudoResonance	pseudoresonance_method
	Which pseudo-resonance to choose. More...

const HardStringTransitionMode	hard_string_transition_mode
	Mode used to control the transition from soft to hard string excitation. More...

const std::pair< double, double >	hard_string_transition_energy_range
	Invariant energy range for the soft-to-hard string transition (in \(\sqrt{s}\) measured in GeV). More...

Private Attributes
const double	AQM_strange_suppression = 0.4
	Factor to reduce cross sections for strange hadrons, this is currently fixed. More...

const double	AQM_charm_suppression
	Factor to reduce cross sections for charmed hadrons. More...

const double	AQM_bottom_suppression
	Factor to reduce cross sections for bottomed hadrons. More...

Constructor & Destructor Documentation

◆ ScatterActionsFinderParameters()

smash::ScatterActionsFinderParameters::ScatterActionsFinderParameters	(	Configuration &	config,
		const ExperimentParameters &	parameters
	)

Class constructor.

Parameters

[in]	config	The relevant section from the user configuration
[in]	parameters	The Experiment parameters

Exceptions

std::invalid_argument If configuration parameters are physically invalid

Definition at line 114 of file scatteractionsfinder.cc.

     : elastic_parameter(config.take(InputKeys::collTerm_elasticCrossSection)),
       low_snn_cut(parameters.low_snn_cut),
       scale_xs(parameters.scale_xs),
       additional_el_xs(
           config.take(InputKeys::collTerm_additionalElasticCrossSection)),
       maximum_cross_section(parameters.maximum_cross_section),
       coll_crit(parameters.coll_crit),
       nnbar_treatment(parameters.nnbar_treatment),
       included_2to2(parameters.included_2to2),
       charm_rescattering(parameters.charm_rescattering),
       included_multi(parameters.included_multi),
       testparticles(parameters.testparticles),
       two_to_one(parameters.two_to_one),
       allow_collisions_within_nucleus(
           config.take(InputKeys::modi_collider_collisionWithinNucleus)),
       spin_interaction_type(parameters.spin_interaction_type),
       strings_switch(parameters.strings_switch),
       use_AQM(config.take(InputKeys::collTerm_useAQM)),
       strings_with_probability(
           config.take(InputKeys::collTerm_stringsWithProbability)),
       only_warn_for_high_prob(
           config.take(InputKeys::collTerm_onlyWarnForHighProbability)),
       transition_high_energy{create_string_transition_parameters(config)},
       total_xs_strategy(config.take(InputKeys::collTerm_totXsStrategy)),
       pseudoresonance_method(config.take(InputKeys::collTerm_pseudoresonance)),
       hard_string_transition_mode(
           config.take(InputKeys::collTerm_hardStringTransition_mode)),
       hard_string_transition_energy_range(
           config.take(InputKeys::collTerm_hardStringTransition_energyRange)),
       AQM_charm_suppression(
           config.take(InputKeys::collTerm_HF_AQMcSuppression)),
       AQM_bottom_suppression(
           config.take(InputKeys::collTerm_HF_AQMbSuppression)) {
   if (total_xs_strategy == TotalCrossSectionStrategy::BottomUp) {
     logg[LFindScatter].info(
         "Evaluating total cross sections from partial processes.");
   } else if (parameters.included_2to2[IncludedReactions::Elastic] == 1 &&
              parameters.included_2to2.count() == 1) {
     throw std::invalid_argument(
         "The BottomUp strategy for total cross section evaluation is needed to "
         "have only elastic interactions, please change the configuration "
         "accordingly.");
   } else if (total_xs_strategy == TotalCrossSectionStrategy::TopDown) {
     logg[LFindScatter].info(
         "Evaluating total cross sections from parametrizations.");
   } else if (total_xs_strategy == TotalCrossSectionStrategy::TopDownMeasured) {
     logg[LFindScatter].info(
         "Evaluating total cross sections from parametrizations only for "
         "measured processes.");
   }
  
   if (!use_AQM && (total_xs_strategy != TotalCrossSectionStrategy::BottomUp)) {
     logg[LFindScatter].warn(
         "It is not possible to completely disable AQM when "
         "Total_Cross_Section_Strategy is set to \"TopDown\" or "
         "\"TopDownMeasured\".\n"
         "AQM will be used for total parametrizations of cross sections.");
   }
 }

Member Function Documentation

◆ AQM_scaling_factor()

double smash::ScatterActionsFinderParameters::AQM_scaling_factor ( const PdgCode & pdg ) const

inline

AQM scaling factor for a hadron.

The suppression factor for strangeness is fixed to 40%, while the charm and bottom can be configured.

Parameters

[in] pdg of the particle

Definition at line 160 of file scatteractionsfinderparameters.h.

                                                       {
     return (1 - AQM_strange_suppression * pdg.frac_strange()) *
            (1 - AQM_charm_suppression * pdg.frac_charm()) *
            (1 - AQM_bottom_suppression * pdg.frac_bottom());
   }

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Member Data Documentation

◆ elastic_parameter

const double smash::ScatterActionsFinderParameters::elastic_parameter

Elastic cross section parameter (in mb).

Definition at line 81 of file scatteractionsfinderparameters.h.

◆ low_snn_cut

const double smash::ScatterActionsFinderParameters::low_snn_cut

Elastic collsions between two nucleons with sqrt_s below low_snn_cut_ are excluded.

Definition at line 86 of file scatteractionsfinderparameters.h.

◆ scale_xs

const double smash::ScatterActionsFinderParameters::scale_xs

Factor by which all (partial) cross sections are scaled.

Definition at line 88 of file scatteractionsfinderparameters.h.

◆ additional_el_xs

const double smash::ScatterActionsFinderParameters::additional_el_xs

Additional constant contribution (in mb) to the elastic cross sections.

Using it will break agreement with experimental data for elastic cross sections that are constrained with data.

Definition at line 95 of file scatteractionsfinderparameters.h.

◆ maximum_cross_section

const double smash::ScatterActionsFinderParameters::maximum_cross_section

See also: input_collision_term_

Definition at line 97 of file scatteractionsfinderparameters.h.

◆ coll_crit

const CollisionCriterion smash::ScatterActionsFinderParameters::coll_crit

Specifies which collision criterion is used.

Definition at line 99 of file scatteractionsfinderparameters.h.

◆ nnbar_treatment

const NNbarTreatment smash::ScatterActionsFinderParameters::nnbar_treatment

Switch for NNbar reactions.

Definition at line 101 of file scatteractionsfinderparameters.h.

◆ included_2to2

const ReactionsBitSet smash::ScatterActionsFinderParameters::included_2to2

List of included 2<->2 reactions.

Definition at line 103 of file scatteractionsfinderparameters.h.

◆ charm_rescattering

const CharmRescattering smash::ScatterActionsFinderParameters::charm_rescattering

Specifies kind of charm rescattering.

Definition at line 105 of file scatteractionsfinderparameters.h.

◆ included_multi

const MultiParticleReactionsBitSet smash::ScatterActionsFinderParameters::included_multi

List of included multi-particle reactions.

Definition at line 107 of file scatteractionsfinderparameters.h.

◆ testparticles

const int smash::ScatterActionsFinderParameters::testparticles

Number of test particles.

Definition at line 109 of file scatteractionsfinderparameters.h.

◆ two_to_one

const bool smash::ScatterActionsFinderParameters::two_to_one

Enables resonance production.

Definition at line 111 of file scatteractionsfinderparameters.h.

◆ allow_collisions_within_nucleus

const bool smash::ScatterActionsFinderParameters::allow_collisions_within_nucleus

If particles within the same nucleus are allowed to collide for their first time.

Definition at line 114 of file scatteractionsfinderparameters.h.

◆ spin_interaction_type

const SpinInteractionType smash::ScatterActionsFinderParameters::spin_interaction_type

Switch to control whether to include spin interactions.

Definition at line 116 of file scatteractionsfinderparameters.h.

◆ strings_switch

const bool smash::ScatterActionsFinderParameters::strings_switch

Indicates whether string fragmentation is switched on.

Definition at line 118 of file scatteractionsfinderparameters.h.

◆ use_AQM

const bool smash::ScatterActionsFinderParameters::use_AQM

Switch to control whether to use AQM or not.

Definition at line 120 of file scatteractionsfinderparameters.h.

◆ strings_with_probability

const bool smash::ScatterActionsFinderParameters::strings_with_probability

This indicates whether the string fragmentation is swiched on with a probability smoothly increasing with energy.

If it's set equal to false, the cross section of the string fragmentation is counted by taking the difference between the parametrized total cross section and the sum of the non-string cross sections.

Definition at line 128 of file scatteractionsfinderparameters.h.

◆ only_warn_for_high_prob

const bool smash::ScatterActionsFinderParameters::only_warn_for_high_prob

Switch to turn off throwing an exception for collision probabilities larger than 1.

In larger production runs it is ok, if the probability rarely slips over 1.

Definition at line 134 of file scatteractionsfinderparameters.h.

◆ transition_high_energy

const StringTransitionParameters smash::ScatterActionsFinderParameters::transition_high_energy

Constants related to transition between low collision energies - mediated via resonances - and high collision energies - mediated via strings.

Definition at line 139 of file scatteractionsfinderparameters.h.

◆ total_xs_strategy

const TotalCrossSectionStrategy smash::ScatterActionsFinderParameters::total_xs_strategy

Method used to evaluate total cross sections for collision finding.

Definition at line 141 of file scatteractionsfinderparameters.h.

◆ pseudoresonance_method

const PseudoResonance smash::ScatterActionsFinderParameters::pseudoresonance_method

Which pseudo-resonance to choose.

Definition at line 143 of file scatteractionsfinderparameters.h.

◆ hard_string_transition_mode

const HardStringTransitionMode smash::ScatterActionsFinderParameters::hard_string_transition_mode

Mode used to control the transition from soft to hard string excitation.

Definition at line 145 of file scatteractionsfinderparameters.h.

◆ hard_string_transition_energy_range

const std::pair<double, double> smash::ScatterActionsFinderParameters::hard_string_transition_energy_range

Invariant energy range for the soft-to-hard string transition (in \(\sqrt{s}\) measured in GeV).

The first element is the lower bound and the second element is the upper bound of the transition interval.

Definition at line 153 of file scatteractionsfinderparameters.h.

◆ AQM_strange_suppression

const double smash::ScatterActionsFinderParameters::AQM_strange_suppression = 0.4

private

Factor to reduce cross sections for strange hadrons, this is currently fixed.

Definition at line 169 of file scatteractionsfinderparameters.h.

◆ AQM_charm_suppression

const double smash::ScatterActionsFinderParameters::AQM_charm_suppression

private

Factor to reduce cross sections for charmed hadrons.

Definition at line 171 of file scatteractionsfinderparameters.h.

◆ AQM_bottom_suppression

const double smash::ScatterActionsFinderParameters::AQM_bottom_suppression

private

Factor to reduce cross sections for bottomed hadrons.

Definition at line 173 of file scatteractionsfinderparameters.h.

The documentation for this class was generated from the following files:

src/include/smash/scatteractionsfinderparameters.h
src/scatteractionsfinder.cc

Public Member Functions

Public Attributes

Private Attributes

Constructor & Destructor Documentation

◆ ScatterActionsFinderParameters()

Member Function Documentation

◆ AQM_scaling_factor()

Member Data Documentation

◆ elastic_parameter

◆ low_snn_cut

◆ scale_xs

◆ additional_el_xs

◆ maximum_cross_section

◆ coll_crit

◆ nnbar_treatment

◆ included_2to2

◆ charm_rescattering

◆ included_multi

◆ testparticles

◆ two_to_one

◆ allow_collisions_within_nucleus

◆ spin_interaction_type

◆ strings_switch

◆ use_AQM

◆ strings_with_probability

◆ only_warn_for_high_prob

◆ transition_high_energy

◆ total_xs_strategy

◆ pseudoresonance_method

◆ hard_string_transition_mode

◆ hard_string_transition_energy_range

◆ AQM_strange_suppression

◆ AQM_charm_suppression

◆ AQM_bottom_suppression