Calculate the hemisphere masses and broadenings. More...

#include <Hemispheres.hh>

Inheritance diagram for Rivet::Hemispheres:

Public Member Functions
	Hemispheres (const AxesDefinition &ax)
	Constructor.

virtual const Projection *	clone () const
	Clone on the heap.

void	clear ()

bool	massMatchesBroadening ()
	Is the hemisphere with the max mass the same as the one with the max broadening?

Hemisphere masses (scaled by \f$ 1 / E^2_\mathrm{vis} \f$).
double	E2vis () const

double	Evis () const

double	M2high () const

double	Mhigh () const

double	M2low () const

double	Mlow () const

double	M2diff () const

double	Mdiff () const

double	scaledM2high () const

double	scaledMhigh () const

double	scaledM2low () const

double	scaledMlow () const

double	scaledM2diff () const

double	scaledMdiff () const

Hemisphere broadenings.
double	Bmax () const

double	Bmin () const

double	Bsum () const

double	Bdiff () const

Public Member Functions inherited from Rivet::Projection
bool	before (const Projection &p) const

virtual const std::set< PdgIdPair >	beamPairs () const

virtual std::string	name () const
	Get the name of the projection.

Projection &	addPdgIdPair (PdgId beam1, PdgId beam2)
	Add a colliding beam pair.

Log &	getLog () const
	Get a Log object based on the getName() property of the calling projection object.

void	setName (const std::string &name)
	Used by derived classes to set their name.

	Projection ()
	The default constructor.

virtual	~Projection ()
	The destructor.

Public Member Functions inherited from Rivet::ProjectionApplier
	ProjectionApplier ()
	Constructor.

std::set< ConstProjectionPtr >	getProjections () const
	Get the contained projections, including recursion.

template<typename PROJ >
const PROJ &	getProjection (const std::string &name) const
	Get the named projection, specifying return type via a template argument.

const Projection &	getProjection (const std::string &name) const

template<typename PROJ >
const PROJ &	applyProjection (const Event &evt, const PROJ &proj) const
	Apply the supplied projection on event.

template<typename PROJ >
const PROJ &	applyProjection (const Event &evt, const Projection &proj) const
	Apply the supplied projection on event.

template<typename PROJ >
const PROJ &	applyProjection (const Event &evt, const std::string &name) const
	Apply the named projection on event.

Protected Member Functions
void	project (const Event &e)
	Perform the projection on the Event.

int	compare (const Projection &p) const
	Compare with other projections.

Protected Member Functions inherited from Rivet::Projection
Cmp< Projection >	mkNamedPCmp (const Projection &otherparent, const std::string &pname) const

Cmp< Projection >	mkPCmp (const Projection &otherparent, const std::string &pname) const

Protected Member Functions inherited from Rivet::ProjectionApplier
Log &	getLog () const

ProjectionHandler &	getProjHandler () const
	Get a reference to the ProjectionHandler for this thread.

template<typename PROJ >
const PROJ &	addProjection (const PROJ &proj, const std::string &name)

Detailed Description

Calculate the hemisphere masses and broadenings.

Calculate the hemisphere masses and broadenings, with event hemispheres defined by the plane normal to the thrust vector, $\vec{n}_\mathrm{T}$ .

The "high" hemisphere mass, $M^2_\mathrm{high} / E^2_\mathrm{vis}$ , is defined as

$\frac{M^2_\mathrm{high}}{E^2_\mathrm{vis}} = \frac{1}{E^2_\mathrm{vis}} \max \left( \left| \sum_{\vec{p}_k \cdot \vec{n}_\mathrm{T} > 0} p_k \right|^2 , \left| \sum_{\vec{p}_k \cdot \vec{n}_\mathrm{T} < 0} p_k \right|^2 \right)$

and the corresponding "low" hemisphere mass, $M^2_\mathrm{low} / E^2_\mathrm{vis}$ , is the sum of momentum vectors in the opposite hemisphere, i.e. $\max \rightarrow \min$ in the formula above.

Finally, we define a hemisphere mass difference:

$\frac{M^2_\mathrm{diff} }{ E^2_\mathrm{vis}} = \frac{ M^2_\mathrm{high} - M^2_\mathrm{low} }{ E^2_\mathrm{vis}} .$

Similarly to the masses, we also define hemisphere broadenings, using the momenta transverse to the thrust axis:

$B_\pm = \frac{ \sum{\pm \vec{p}_i \cdot \vec{n}_\mathrm{T} > 0} |\vec{p}_i \times \vec{n}_\mathrm{T} | }{ 2 \sum_i | \vec{p}_i | }$

and then a set of the broadening maximum, minimum, sum and difference as follows:

$B_\mathrm{max} = \max(B_+, B_-)$

$B_\mathrm{min} = \min(B_+, B_-)$

$B_\mathrm{sum} = B_+ + B_-$

$B_\mathrm{diff} = |B_+ - B_-|$

Internally, this projection uses a Thrust or Sphericity projection to determine the hemisphere orientation.

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

include/Rivet/Projections/Hemispheres.hh
src/Projections/Hemispheres.cc

Public Member Functions

Protected Member Functions

Detailed Description