Public Member Functions
def	__init__ (self, name)

def	get_prefixes (self, always_include_indices=False, use_relative_indices=False)

def	build (cls, decay_string)

Public Attributes
	name
	name of the particle

	selected
	whether or not this particle is selected

	children
	mapping of children decayIndex->Node

Private Member Functions
def	__walk (self, always_include_indices, use_relative_indices, current_prefix, current_path)

Detailed Description

Class to present selected particles from a DecayString as tree structure.
For each node of the tree we safe the name of the particle, whether it is
selected and a dictionary of all children (as mapping decayIndex -> Node)

Definition at line 172 of file utils.py.

Constructor & Destructor Documentation

◆ init()

def __init__	(	self,
		name
	)

Just set default values

Definition at line 179 of file utils.py.

     def __init__(self, name):
         """Just set default values"""
         
         self.name = name
         
         self.selected = False
         
         self.children = {}

Member Function Documentation

◆ __walk()

def __walk	(	self,
		always_include_indices,
		use_relative_indices,
		current_prefix,
		current_path
	)

private

Recursively walk the tree and collect all prefixes

See:
    `get_prefixes`

Arguments:
    always_include_indices (bool): see `get_prefixes()`
    use_relative_indices (bool): see `get_prefixes()`
    current_prefix: the current prefix so far collected from any parent
        particle.
    current_path: the current path of indices so far collected from any
        parent particle.

Definition at line 219 of file utils.py.

◆ build()

def build	(	cls,
		decay_string
	)

Build a tree of selected particles from a `DecayString`

This will return a `DecayParticleNode` instance which is the top of a
tree of all the selected particles from the decat string.

Arguments:
    decay_string (str): `DecayString` containing at least one selected particle

Definition at line 268 of file utils.py.

◆ get_prefixes()

def get_prefixes	(	self,
		always_include_indices = `False`,
		use_relative_indices = `False`
	)

Recursively walk through the tree of selected particles and return a list
of prefixes for aliases and a tuple of decay indexes for that prefix.

For example for ``B0 -> [D0 -> ^pi+] ^pi0`` it might return

>>> DecayParticleNode.build('^B0 -> [D0 -> ^pi+] ^pi0').get_prefixes()
[ ("", None), ("D0_pi", (0, 0)), ("pi0", (1,)) ]

and to create aliases from these one would use the indices as arguments for
the b2:var:`daughter` meta variable.

This function will make sure that prefix names are unique: If there are
multiple siblings of one node with the same particle name they will be
distinguised by either suffixing them with the decay index (if
``use_relative_indices=False``) or they will just be enumerated
starting at 0 otherwise.

Arguments:
    always_include_indices (bool): If True always add the index of the
        particle to the prefix, otherwise the index is only added if
        more than one sibling of the same particle exist.
    use_relative_indices (bool): If True the indices used will **not**
        be the daughter indices in the full decay string but just the
        relative indices: If multiple sibling particles with the same
        name they will be just numbered starting at zero as they appear
        in the aliases.

Definition at line 188 of file utils.py.

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

analysis/scripts/variables/utils.py

Public Member Functions

Public Attributes

Private Member Functions