Generic 4-momentum filtering, efficiency and smearing utils

Topics
	Experiment-specific missing-ET smearing functions

Classes
struct	Rivet::P4SmearParams
	Struct for holding momentum-smearing parameters. More...
struct	Rivet::P4_EFF_CONST
	Take a FourMomentum and return a constant number. More...
struct	Rivet::P3_EFF_CONST
	Take a Vector3 and return a constant number. More...

Functions
double	Rivet::P3_EFF_ZERO (const Vector3 &)
	Take a Vector3 and return 0.
double	Rivet::P3_EFF_ONE (const Vector3 &)
	Take a Vector3 and return 1.
Vector3	Rivet::P3_SMEAR_IDENTITY (const Vector3 &p)
	Take a Vector3 and return it unmodified.
Vector3	Rivet::P3_SMEAR_PERFECT (const Vector3 &p)
	Alias for P3_SMEAR_IDENTITY.
Vector3	Rivet::P3_SMEAR_LEN_GAUSS (const Vector3 &p, double resolution)
	Smear a Vector3's length using a Gaussian of absolute width resolution.
typedef std::function< FourMomentum(const FourMomentum &)>	Rivet::P4SmearFn
	Typedef for FourMomentum smearing functions/functors.
typedef std::function< double(const FourMomentum &)>	Rivet::P4EffFn
	Typedef for FourMomentum efficiency functions/functors.
double	Rivet::P4_EFF_ZERO (const FourMomentum &)
	Take a FourMomentum and return 0.
double	Rivet::P4_EFF_ONE (const FourMomentum &)
	Take a FourMomentum and return 1.
FourMomentum	Rivet::P4_SMEAR_IDENTITY (const FourMomentum &p)
	Take a FourMomentum and return it unmodified.
FourMomentum	Rivet::P4_SMEAR_PERFECT (const FourMomentum &p)
	Alias for P4_SMEAR_IDENTITY.
FourMomentum	Rivet::P4_SMEAR_E_GAUSS (const FourMomentum &p, double resolution)
FourMomentum	Rivet::P4_SMEAR_PT_GAUSS (const FourMomentum &p, double resolution)
	Smear a FourMomentum's transverse momentum using a Gaussian of absolute width resolution.
FourMomentum	Rivet::P4_SMEAR_MASS_GAUSS (const FourMomentum &p, double resolution)
	Smear a FourMomentum's mass using a Gaussian of absolute width resolution.

Detailed Description

Function Documentation

P4_SMEAR_E_GAUSS()

FourMomentum Rivet::P4_SMEAR_E_GAUSS ( const FourMomentum & p, double resolution )

inline

Smear a FourMomentum's energy using a Gaussian of absolute width resolution

Todo

Also make jet versions that update/smear constituents?

References mass(), max(), Rivet::FourMomentum::mkEtaPhiME(), Rivet::Kin::p(), and randnorm().

Referenced by ELECTRON_SMEAR_ATLAS_RUN1(), and ELECTRON_SMEAR_CMS_RUN1().