#include <JETSCAPE/blob/main/external_packages/trento/src/nucleon.h>

Collaboration diagram for trento::NucleonProfile:

Public Member Functions
	NucleonProfile (const VarMap &var_map)
	Instantiate from the configuration.

double	radius () const
	The radius at which the nucleon profile is truncated.

double	max_impact () const
	The maximum impact parameter for participation.

void	fluctuate ()

double	thickness (double distance_sqr) const

double	deterministic_thickness (double distance_sqr) const

double	norm_Tpp (double bpp_sqr) const
	WK: return Tpp given bpp^2.

bool	participate (Nucleon &A, Nucleon &B) const
	Randomly determine if a pair of nucleons participates.

Private Attributes
const double	width_sqr_
	Width of Gaussian thickness function.

const double	trunc_radius_sqr_
	Truncate the Gaussian at this radius.

const double	max_impact_sqr_
	Maximum impact parameter for participants.

const double	neg_one_div_two_width_sqr_

const double	neg_one_div_four_width_sqr_
	WK 1/4w^2.

const double	one_div_four_pi_
	WK 1/4pi.

const double	cross_sec_param_

const FastExp< double >	fast_exp_
	Fast exponential for calculating the thickness profile.

std::gamma_distribution< double >	fluct_dist_
	Fluctuation distribution.

double	prefactor_
	Thickness function prefactor = fluct/(2piw^2)

bool	with_ncoll_
	bool variable to calcualte Ncoll

Detailed Description

Encapsulates properties shared by all nucleons: transverse thickness profile, cross section, fluctuations. Responsible for sampling nucleon-nucleon participation with given \sigma_{NN}.

Definition at line 24 of file nucleon.h.

View newest version in sPHENIX GitHub at line 24 of file nucleon.h

Constructor & Destructor Documentation

trento::NucleonProfile::NucleonProfile ( const VarMap & var_map )

explicit

Instantiate from the configuration.

Definition at line 116 of file nucleon.cxx.

View newest version in sPHENIX GitHub at line 116 of file nucleon.cxx

Member Function Documentation

double trento::NucleonProfile::deterministic_thickness ( double distance_sqr ) const

inline

WK: same as above, but without the Gamma fluctuation, used in the calculation of binary collision density

Definition at line 188 of file nucleon.h.

View newest version in sPHENIX GitHub at line 188 of file nucleon.h

References fast_exp_, neg_one_div_two_width_sqr_, trunc_radius_sqr_, and width_sqr_.

Referenced by trento::Event::accumulate_TAB().

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void trento::NucleonProfile::fluctuate ( )

inline

Randomly fluctuate the profile. Should be called prior to evaluating the thickness function for a new nucleon.

Definition at line 176 of file nucleon.h.

View newest version in sPHENIX GitHub at line 176 of file nucleon.h

References trento::random::engine, fluct_dist_, prefactor_, and width_sqr_.

Referenced by trento::Event::compute_nuclear_thickness(), and TEST_CASE().

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double trento::NucleonProfile::max_impact ( ) const

inline

The maximum impact parameter for participation.

Definition at line 172 of file nucleon.h.

View newest version in sPHENIX GitHub at line 172 of file nucleon.h

References max_impact_sqr_.

double trento::NucleonProfile::norm_Tpp ( double bpp_sqr ) const

inline

WK: return Tpp given bpp^2.

Definition at line 196 of file nucleon.h.

View newest version in sPHENIX GitHub at line 196 of file nucleon.h

References fast_exp_, neg_one_div_four_width_sqr_, one_div_four_pi_, and width_sqr_.

Referenced by trento::Event::accumulate_TAB().

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bool trento::NucleonProfile::participate	(	Nucleon &	A,
		Nucleon &	B
	)		const

inline

Randomly determine if a pair of nucleons participates.

Definition at line 201 of file nucleon.h.

View newest version in sPHENIX GitHub at line 201 of file nucleon.h

References cross_sec_param_, dy, trento::Nucleon::is_participant(), max_impact_sqr_, trento::Nucleon::set_participant(), width_sqr_, with_ncoll_, trento::Nucleon::x(), and trento::Nucleon::y().

Referenced by trento::Collider::sample_impact_param().

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double trento::NucleonProfile::radius ( ) const

inline

The radius at which the nucleon profile is truncated.

Definition at line 168 of file nucleon.h.

View newest version in sPHENIX GitHub at line 168 of file nucleon.h

References trunc_radius_sqr_.

Referenced by trento::Event::accumulate_TAB(), and trento::Event::compute_nuclear_thickness().

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double trento::NucleonProfile::thickness ( double distance_sqr ) const

inline

Compute the thickness function at a (squared) distance from the profile center.

Definition at line 181 of file nucleon.h.

View newest version in sPHENIX GitHub at line 181 of file nucleon.h

References fast_exp_, neg_one_div_two_width_sqr_, prefactor_, and trunc_radius_sqr_.

Referenced by trento::Event::compute_nuclear_thickness().

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Member Data Documentation

const double trento::NucleonProfile::cross_sec_param_

private

Dimensionless parameter set to reproduce the inelastic nucleon-nucleon cross section {NN}. Calculated in constructor.

Definition at line 75 of file nucleon.h.

View newest version in sPHENIX GitHub at line 75 of file nucleon.h

Referenced by participate().

const FastExp<double> trento::NucleonProfile::fast_exp_

private

Fast exponential for calculating the thickness profile.

Definition at line 78 of file nucleon.h.

View newest version in sPHENIX GitHub at line 78 of file nucleon.h

Referenced by deterministic_thickness(), norm_Tpp(), and thickness().

std::gamma_distribution<double> trento::NucleonProfile::fluct_dist_

private

Fluctuation distribution.

Definition at line 81 of file nucleon.h.

View newest version in sPHENIX GitHub at line 81 of file nucleon.h

Referenced by fluctuate().

const double trento::NucleonProfile::max_impact_sqr_

private

Maximum impact parameter for participants.

Definition at line 61 of file nucleon.h.

View newest version in sPHENIX GitHub at line 61 of file nucleon.h

Referenced by max_impact(), and participate().

const double trento::NucleonProfile::neg_one_div_four_width_sqr_

private

WK 1/4w^2.

Definition at line 68 of file nucleon.h.

View newest version in sPHENIX GitHub at line 68 of file nucleon.h

Referenced by norm_Tpp().

const double trento::NucleonProfile::neg_one_div_two_width_sqr_

private

Cache (-1/2w^2) for use in the thickness function exponential. Yes, this actually makes a speed difference...

Definition at line 65 of file nucleon.h.

View newest version in sPHENIX GitHub at line 65 of file nucleon.h

Referenced by deterministic_thickness(), and thickness().

const double trento::NucleonProfile::one_div_four_pi_

private

WK 1/4pi.

Definition at line 71 of file nucleon.h.

View newest version in sPHENIX GitHub at line 71 of file nucleon.h

Referenced by norm_Tpp().

double trento::NucleonProfile::prefactor_

private

Thickness function prefactor = fluct/(2*pi*w^2)

Definition at line 84 of file nucleon.h.

View newest version in sPHENIX GitHub at line 84 of file nucleon.h

Referenced by fluctuate(), and thickness().

const double trento::NucleonProfile::trunc_radius_sqr_

private

Truncate the Gaussian at this radius.

Definition at line 58 of file nucleon.h.

View newest version in sPHENIX GitHub at line 58 of file nucleon.h

Referenced by deterministic_thickness(), radius(), and thickness().

const double trento::NucleonProfile::width_sqr_

private

Width of Gaussian thickness function.

Definition at line 55 of file nucleon.h.

View newest version in sPHENIX GitHub at line 55 of file nucleon.h

Referenced by deterministic_thickness(), fluctuate(), norm_Tpp(), and participate().

bool trento::NucleonProfile::with_ncoll_

private

bool variable to calcualte Ncoll

Definition at line 87 of file nucleon.h.

View newest version in sPHENIX GitHub at line 87 of file nucleon.h

Referenced by participate().

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

JETSCAPE/blob/main/external_packages/trento/src/nucleon.h
JETSCAPE/blob/main/external_packages/trento/src/nucleon.cxx

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation