apfel::TwoBodyPhaseSpace Class Reference

Class for the calculation of the phase-space reduction factor due to cuts on the single outgoing lepton in Drell-Yan production. The relevant process is:
γ(q) → l⁺(k₁) + l^-(k₂)
with:
k_T,1(2) > p_T,min,1(2)
< η_min
η₁₍₂₎ < η_max
More...

#include <twobodyphasespace.h>

Public Member Functions
	TwoBodyPhaseSpace (double const &pTmin1, double const &pTmin2, double const &etamin, double const &etamax, double const &eps)
	The "TwoBodyPhaseSpace" constructor for asymmetric cuts.
	TwoBodyPhaseSpace (double const &pTmin, double const &etamin, double const &etamax, double const &eps=1e-9)
	The "TwoBodyPhaseSpace" constructor for symmetric cuts.
double	PhaseSpaceReduction (double const &Q, double const &y, double const &qT)
	Function that returns the phase-space reduction factor.
double	DerivePhaseSpaceReduction (double const &Q, double const &y, double const &qT)
	Function that returns the derivative w.r.t. qT of the phase-space reduction factor.
double	ParityViolatingPhaseSpaceReduction (double const &Q, double const &y, double const &qT)
	Function that returns the phase-space reduction factor associated to the parity violating contribution.

Private Attributes
Cut variables
Cut Variables that define the cuts on the single leptons
double const	_pTmin1
double const	_pTmin2
double const	_etamin
double const	_etamax
double const	_eps

Detailed Description

Class for the calculation of the phase-space reduction factor due to cuts on the single outgoing lepton in Drell-Yan production. The relevant process is:
γ(q) → l⁺(k₁) + l^-(k₂)
with:
k_T,1(2) > p_T,min,1(2)
< η_min
η₁₍₂₎ < η_max

Constructor & Destructor Documentation

TwoBodyPhaseSpace() [1/2]

apfel::TwoBodyPhaseSpace::TwoBodyPhaseSpace	(	double const &	pTmin1,
		double const &	pTmin2,
		double const &	etamin,
		double const &	etamax,
		double const &	eps )

The "TwoBodyPhaseSpace" constructor for asymmetric cuts.

Parameters

pTmin1	the minimum cut in the pT of the first single lepton
pTmin2	the minimum cut in the pT of the second single lepton
etamin	the minimum cut in the η of the single lepton
etamax	the maximum cut in the η of the single lepton
eps	the integration accuracy

TwoBodyPhaseSpace() [2/2]

apfel::TwoBodyPhaseSpace::TwoBodyPhaseSpace	(	double const &	pTmin,
		double const &	etamin,
		double const &	etamax,
		double const &	eps = 1e-9 )

The "TwoBodyPhaseSpace" constructor for symmetric cuts.

Parameters

pTmin	the minimum cut in the pT of the single lepton
etamin	the minimum cut in the η of the single lepton
etamax	the maximum cut in the η of the single lepton
eps	the integration accuracy (default = 10-9)

Member Function Documentation

DerivePhaseSpaceReduction()

double apfel::TwoBodyPhaseSpace::DerivePhaseSpaceReduction	(	double const &	Q,
		double const &	y,
		double const &	qT )

Function that returns the derivative w.r.t. qT of the phase-space reduction factor.

Parameters

Q	invariant mass of the leptonic pair
y	rapidity of the leptonic pair
qT	transverse momentum of the leptonic pair

Returns

the derivative of the phase-space reduction factor as a function of the invariant mass, transverse momentum and rapidity of the lepton pair.

ParityViolatingPhaseSpaceReduction()

double apfel::TwoBodyPhaseSpace::ParityViolatingPhaseSpaceReduction	(	double const &	Q,
		double const &	y,
		double const &	qT )

Function that returns the phase-space reduction factor associated to the parity violating contribution.

Parameters

Q	invariant mass of the leptonic pair
y	rapidity of the leptonic pair
qT	transverse momentum of the leptonic pair

Returns

the phase-space reduction factor as a function of the invariant mass, transverse momentum and rapidity of the lepton pair.

PhaseSpaceReduction()

double apfel::TwoBodyPhaseSpace::PhaseSpaceReduction	(	double const &	Q,
		double const &	y,
		double const &	qT )

Function that returns the phase-space reduction factor.

Parameters

Q	invariant mass of the leptonic pair
y	rapidity of the leptonic pair
qT	transverse momentum of the leptonic pair

Returns

the phase-space reduction factor as a function of the invariant mass, transverse momentum and rapidity of the lepton pair.

Member Data Documentation

_eps

double const apfel::TwoBodyPhaseSpace::_eps

private

_etamax

double const apfel::TwoBodyPhaseSpace::_etamax

private

_etamin

double const apfel::TwoBodyPhaseSpace::_etamin

private

_pTmin1

double const apfel::TwoBodyPhaseSpace::_pTmin1

private

_pTmin2

double const apfel::TwoBodyPhaseSpace::_pTmin2

private

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

• /Users/vb262523/Codes/apfelxx/inc/apfel/twobodyphasespace.h