This module contains a few utility classes used when working within the pythonPWA environment.
Briet Wigner function for a given mass, resonance mass, and resonance width. Note that here, it assumes a fixed resonance width.
Args
mass (float)
resMass (float)
gamma (float)
Returns:
Numpy.complex value representing the Briet Wigner function value.
This function takes in a list of v’s (for example the returned list from an iminuit fit) and returns a list of numpy complexes representing the proper v’s for each wave. Note that this function should maintain the ordering established on wave list instantiation, i.e. alphabetical ordering of waves based on filename.
Returns the value of equation 372 in the paper by Salgado and Weygand.
A higher level wrapper around deltaPhi that allows you to simply supply the list of waves, vs, and 2 strings of the filenames of the waves that you want to calculate deltaPhi for and returns you the desired phase difference between the 2 specified waves.