Rivet
1.8.0
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Get the transverse spherocity scalars for hadron-colliders. More...
#include <Spherocity.hh>
Public Member Functions | |
Spherocity (const FinalState &fsp) | |
Constructor. | |
virtual const Projection * | clone () const |
Clone on the heap. | |
double | spherocity () const |
const Vector3 & | spherocityAxis () const |
const Vector3 & | spherocityMajorAxis () const |
The spherocity major axis (axis of max spherocity perpendicular to spherocity axis). | |
const Vector3 & | spherocityMinorAxis () const |
The spherocity minor axis (axis perpendicular to spherocity and spherocity major). | |
const Vector3 & | axis1 () const |
AxesDefinition axis accessors. | |
const Vector3 & | axis2 () const |
The 2nd most significant ("major") axis. | |
const Vector3 & | axis3 () const |
The least significant ("minor") axis. | |
Direct methods | |
Ways to do the calculation directly, without engaging the caching system | |
void | calc (const FinalState &fs) |
Manually calculate the spherocity, without engaging the caching system. | |
void | calc (const vector< Particle > &fsparticles) |
Manually calculate the spherocity, without engaging the caching system. | |
void | calc (const vector< FourMomentum > &fsmomenta) |
Manually calculate the spherocity, without engaging the caching system. | |
void | calc (const vector< Vector3 > &threeMomenta) |
Manually calculate the spherocity, without engaging the caching system. | |
Protected Member Functions | |
void | project (const Event &e) |
Perform the projection on the Event. | |
int | compare (const Projection &p) const |
Compare projections. |
Get the transverse spherocity scalars for hadron-colliders.
The scalar (maximum) transverse spherocity is defined as
, with the direction of the unit vector which maximises
being identified as the spherocity axis. The unit vector which maximises the spherocity scalar in the plane perpendicular to
is the "spherocity major" direction, and the vector perpendicular to both the spherocity and spherocity major directions is the spherocity minor. Both the major and minor directions have associated spherocity scalars.
Care must be taken in the case of Drell-Yan processes - there we should use the newly proposed observable .
double Rivet::Spherocity::spherocity | ( | ) | const [inline] |
Spherocity scalar accessors The spherocity scalar, , (minimum spherocity).
const Vector3& Rivet::Spherocity::spherocityAxis | ( | ) | const [inline] |
Spherocity axis accessors The spherocity axis.
Referenced by axis1().