Emulates the reconstruction of the primary vertex. More...

#include <PVReconstruction.h>

Inheritance diagram for SQLamarr::PVReconstruction:

Classes
class	PVReconstruction
	Transform the MCVertices objects identified as primary vertices into Vertices, smearing their position according to a triple-Gaussian, diagonal resolution function. More...

struct	SmearingParametrization
	Set of parmeters defining three 3-Gaussian functions for x, y and z. More...

struct	SmearingParametrization_1D
	Set of parameters defining a 3-Gaussian resolution function in 1D. More...

Public Member Functions
	PVReconstruction (SQLite3DB &db, const SmearingParametrization &parametrization)
	Constructor. More...

void	execute () override
	Execute the algorithm adding primary vertices to `Vertices` table. More...

Public Member Functions inherited from SQLamarr::BaseSqlInterface
	BaseSqlInterface (SQLite3DB &db)
	Constructor, acquiring the database without ownership. More...

virtual	~BaseSqlInterface ()

void	sync_database (const std::string &db_uri)

void	invalidate_cache (void)
	Invalidate the cache of the queries. More...

Static Public Member Functions
static SmearingParametrization	load_parametrization (const std::string file_path, const std::string table_name, const std::string condition)
	Instanciate a SmearingParametrization object from an SQLite file. More...

Public Attributes
	argtypes

	restype

Additional Inherited Members
Protected Member Functions inherited from SQLamarr::BaseSqlInterface
sqlite3_stmt *	get_statement (const std::string &name, const std::string &query)
	Creates or retrieve from cache a statement. More...

void	begin_transaction ()
	Begin an SQL transaction stopping update to disk util `end_transaction()` is issued More...

void	end_transaction ()
	End an SQL transaction re-enabling disk updates. More...

int	last_insert_row ()
	Return the index of the last rows inserted in any table. More...

void	using_sql_function (const std::string &name, int argc, void(xFunc)(sqlite3_context , int, sqlite3_value **))
	Register a static function in DB, enabling usage from SQL. More...

bool	exec_stmt (sqlite3_stmt *)
	Execute a statement, possibly throwing an exception on failure. More...

Protected Attributes inherited from SQLamarr::BaseSqlInterface
SQLite3DB &	m_database
	Reference to the SQLite database (not owned). More...

Detailed Description

Emulates the reconstruction of the primary vertex.

The position of each primary vertex is smeared according to a parametrization loaded from a configuration file. The covariance matrix defining the uncertainty on the position of the PV is also generated based on a parametrization.

The resolution model used to describe the difference between the true and reconstructed positions of the PV is the sum of three Gaussian distributions sharing their central values.

This simplified model includes two strong assumptions:

the resolution function does not depend on the number of tracks from which the PV is obtained;
the covariance matrix is approximated with a diagonal matrix neglecting correlations among axes

Using PVReconstruction::load_parametrization(), the parametrization can be loaded from an SQLite table defining the following columns:

condition, a string representing the datataking conditions
mu, the mean of the Gaussians
f1, the core-fraction of the first Gaussian
f2, the core-fraction of the second Gaussian
sigma1, the standard deviation of the first Gaussian
sigma2, the standard deviation of the second Gaussian
sigma3, the standard deviation of the third Gaussian

Definition at line 51 of file PVReconstruction.h.

Constructor & Destructor Documentation

◆ PVReconstruction()

SQLamarr::PVReconstruction::PVReconstruction	(	SQLite3DB &	db,
		const SmearingParametrization &	parametrization
	)

Constructor.

Parameters

db	Reference to database (not owned)
parametrization	3-Gaussian parametrization of the resolution function

Definition at line 62 of file PVReconstruction.cpp.

Member Function Documentation

◆ execute()

void SQLamarr::PVReconstruction::execute ( void )

overridevirtual

Execute the algorithm adding primary vertices to Vertices table.

Implements SQLamarr::Transformer.

Definition at line 161 of file PVReconstruction.cpp.

◆ load_parametrization()

PVReconstruction::SmearingParametrization SQLamarr::PVReconstruction::load_parametrization	(	const std::string	file_path,
		const std::string	table_name,
		const std::string	condition
	)

static

Instanciate a SmearingParametrization object from an SQLite file.

Parameters

file_path	SQLite database defining the parametrization
table_name	Name of the table defining the parametrization
condition	Datataking Condition

Definition at line 112 of file PVReconstruction.cpp.

Member Data Documentation

◆ argtypes

SQLamarr.PVReconstruction.argtypes

Definition at line 16 of file PVReconstruction.py.

◆ restype

SQLamarr.PVReconstruction.restype

Definition at line 19 of file PVReconstruction.py.

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

include/SQLamarr/PVReconstruction.h
python/SQLamarr/PVReconstruction.py
src/PVReconstruction.cpp

Classes

Public Member Functions

Static Public Member Functions

Public Attributes

Additional Inherited Members