ml4eft.preproc.lhe_reader.Kinematics

class ml4eft.preproc.lhe_reader.Kinematics(particle)

Bases: pylhe.LHEParticle

LHE kinematics class

__init__(particle)

Loads and combines particles as read from a LHE file

Parameters

particle (pylhe.LHEParticle) – LHE particle object

Examples

We consider \(pp\rightarrow ZH \rightarrow \ell^+\ell^-b\bar{b}\;\) as a simple example

>>> import pylhe
>>> lhe_init = pylhe.read_lhe_init(path_to_lhe)

Loop over the events in the LHE file and append kinematics

>>> events = []
>>> for e in pylhe.read_lhe(path_to_lhe):
...     incoming_part = []
...     # create particle instances
...     for part in e.particles:
...         if part.id in [11, 13]: # e^- or \mu^-
...            l1 = lhe.Kinematics(part)
...         elif part.id in [-11, -13]: # e^+ or \mu^+
...            l2 = lhe.Kinematics(part)
...         elif part.id == 5: # b
...            b = lhe.Kinematics(part)
...         elif part.id == -5: #bbar
...            bbar = lhe.Kinematics(part)
...
...     # Particle systems can be created by adding the separate particle instances
...     ll = l1 + l2 # dilepton system
...     bb = b + bbar # b bbar sytem
...     events.append([l1.get_pt(), l2.get_pt(), ll.get_invariant_mass()])

events now contains the requested kinematics for all events in the LHE file

Methods

__init__(particle)	Loads and combines particles as read from a LHE file
add_system(dict)	Returns a class instance of pylhe.LHEParticle
fromstring(string)
get_inv_mass()	Returns the invariant mass in GeV
get_p()	Returns the magnitude of the 3-momentum
get_phi()	Returns the azimuthal angle in radians with respect to the x-axis
get_pseudorapidity()	Returns the pseudorapidity \(\eta\)
get_pt()	Returns the transverse momentum in GeV
get_rapidity()	Returns the rapidity \(Y\)
get_theta()	Returns the scattering angle in radians with respect to the beam-axis
mothers()

Attributes

fieldnames

classmethod add_system(dict)

Returns a class instance of pylhe.LHEParticle

Parameters

dict (dict) – Combined particle dictionary

Returns

Kinematics object of the combined system

Return type

ml4eft.preproc.lhe_reader.Kinematics

get_inv_mass()

Returns the invariant mass in GeV

Returns

Invariant mass in GeV

Return type

float

get_p()

Returns the magnitude of the 3-momentum

Returns

Magnitude of the 3-momentum

Return type

float

get_phi()

Returns the azimuthal angle in radians with respect to the x-axis

Returns

phi – Azimuthal angle with respect to the y-axis in the transverse plane

Return type

float

get_pseudorapidity()

Returns the pseudorapidity \(\eta\)

Returns

eta – Pseudorapidity

Return type

float

get_pt()

Returns the transverse momentum in GeV

Returns

Transverse momentum in GeV

Return type

float

get_rapidity()

Returns the rapidity \(Y\)

Returns

y – Rapidity

Return type

float

get_theta()

Returns the scattering angle in radians with respect to the beam-axis

Returns

Scattering angle with respect to the beam-axis

Return type

float