hnl Namespace Reference

Classes
class	CKMmatrix
class	constants
class	HNL
class	HNLbranchings

Functions
def	PDGname (particle)
def	mass (str|None particle)
def	lifetime (particle)

Variables
ROOT	pdg = ROOT.TDatabasePDG.Instance()
constants	c = constants()

Detailed Description

# ==================================================================
#   Python module
#
#   This module provides methods to compute the lifetime and
#   branching ratio of HNLs given its mass and couplings as
#   input parameters.
#
#   Created: 30/11/2014 Elena Graverini (elena.graverini@cern.ch)
#
#   Updated: 07/10/2017 Kyrylo Bondarenko (bondarenko@lorentz.leidenuniv.nl)
#
#   Sample usage:
#     ipython -i hnl.py
#     In [1]: b = HNL(1.,[1.e-8, 2.e-8, 1.e-9],True)
#     HNLbranchings instance initialized with couplings:
#          U2e   = 1e-08
#          U2mu  = 2e-08
#          U2tau = 1e-09
#     and mass:
#          m = 1.0 GeV
#     In [2]: b.computeNLifetime()
#     Out[2]: 4.777721453160521e-05
#     In [3]: b.findBranchingRatio('N -> pi mu')
#     Out[3]: 0.11826749348890987
#
# ==================================================================

Function Documentation

lifetime()

def hnl.lifetime

(

particle

)

Read particle lifetime from PDG database

Definition at line 63 of file hnl.py.

def lifetime(particle):
    """
    Read particle lifetime from PDG database
    """
    particle = PDGname(particle)
    tPart = pdg.GetParticle(particle)
    return tPart.Lifetime()
 
 

mass()

def hnl.mass

(

str | None

particle

)

Read particle mass from PDG database

Definition at line 54 of file hnl.py.

def mass(particle: str | None):
    """
    Read particle mass from PDG database
    """
    particle = PDGname(particle)
    tPart = pdg.GetParticle(particle)
    return tPart.Mass()
 
 

PDGname()

def hnl.PDGname

(

particle

)

Change particle name for use with the PDG database

Definition at line 43 of file hnl.py.

def PDGname(particle):
    """
    Change particle name for use with the PDG database
    """
    if "1" in particle:
        particle = particle.replace("1", "'")
    if particle == "nu":
        return "nu_e"  # simple workaround to handle 3nu channel
    return particle
 
 

Variable Documentation

c

constants hnl.c = constants()

Definition at line 115 of file hnl.py.

pdg

ROOT hnl.pdg = ROOT.TDatabasePDG.Instance()

Definition at line 40 of file hnl.py.