Rivet
1.8.0
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Calculate the Parisi event shape tensor (or linear momentum tensor). More...
#include <ParisiTensor.hh>
Public Member Functions | |
ParisiTensor (const FinalState &fsp) | |
Constructor. The provided FinalState projection must live throughout the run. | |
virtual const Projection * | clone () const |
Clone on the heap. | |
void | clear () |
Clear the projection. | |
Access the C and D params. | |
double | C () const |
double | D () const |
Access the eigenvalues of \f$\theta\f$. | |
double | lambda1 () const |
double | lambda2 () const |
double | lambda3 () const |
Protected Member Functions | |
void | project (const Event &e) |
Perform the projection on the Event. | |
int | compare (const Projection &p) const |
Compare with other projections. |
Calculate the Parisi event shape tensor (or linear momentum tensor).
The Parisi event shape C and D variables are derived from the eigenvalues of the linear momentum tensor
which is actually a linearized (and hence infra-red safe) version of the Sphericity tensor.
Defining the three eigenvalues of
, with
, the C and D parameters are defined as
and
Internally, this Projection uses the Sphericity projection with the generalising parameter set to 1.