SISCone Documentation
Version 2.0.6
Scheme for the main algorithm
Scheme for stable cone determination
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SISCone Documentation
Version 2.0.6
Execution time
This figure shows the execution time as a function of the number of particles and compares it with other algorithms. It has been obtained on a 3.4 GHz Pentium® IV processor.
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SISCone Documentation
Version 2.0.6
Downloading SISCone
You can download here the of SISCone source code. It is developped under the terms of the GNU General Public License (GPL). A version of the license should be included in the code.
The algorithm used by SISCone has been subject of a publication in JHEP 05 (2007) 086 [arXiv:0704.0292 (hep-ph)]. Please refer to that work each time it is appropriate.
Download SISCone 2.0.6 (latest stable - April 2013 - Release notes)
You can alternatively download SISCone from its SVN repository.
This can be browsed via HTTP access or accessed using the Subversion repository svn+ssh://svn.hepforge.org/hepforge/svn/siscone.
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SISCone Documentation
Version 2.0.6
The split-merge variable issue:
SISCone is intended to be a cone algorithm that is as close as possible to the Tevatron run II cone algorithm, while also being infrared (IR) safe.Though the main IR difficulties are related to the search for stable cones, and are solved by a seedless procedure, it turns out that the split-merge phase of the algorithm is also non-trivial. The Tevatron run II split-merge procedure requires that "protojets" be considered in a sequence determined by some ordering variable. A change in the sequence can leads to a change in the final jets. When trying to find the best suited variable for the ordering of protojets in the split--merge process of SISCone, we met a couple of physical issues. Their history goes as follows:
- the Et variable, suggested e.g. in the Tevatron Run II specification of the midpint algorithm, is not boost invariant.
- the pt variable, used e.g. in practical midpoint implementations (except for MCFM), suffers from problems with two back-to-back protojets. Due to momentum conservation, they can have the same pt. Their ordering is thus random and can be modified by the addition of a soft particle, leading to an IR unsafety problem.
- the mt variable does not directly suffer from that problem: two back-to-back jets only overlap if they cover a region in the eta-phi plane. In that case, their values of mt will differ and the ordering is safe. This choice (the default one for SISCone 1.1.0) suffers unfortunately from one remaining issue: though mt works for pure QCD, in the case of two back-to-back narrow-decay-width unstable particles (e.g. a pair of Higgs bosons), both pt and mt will be the same.
- As of SISCone 1.1.1, we use pttilde: the p-scheme pt (the sum of the moduli of transverse momenta of all particles in the protojet ) that interpolates between pt and mt according to the decay plane of the unstable massive particle. This will lift the degeneracy between decays of identical pairs of unstable particles, since the phase space for them to have identical decay planes vanishes.
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Contacts: Gregory Soyez Gavin Salam siscone-2.0.6.orig/doc/html/algo_main.dot 0000644 0001750 0001750 00000002427 12132014066 016464 0 ustar sun sun digraph algo_main { nodesep=0.15; ranksep=0.15; node [shape=box,style=filled,fillcolor="#CCCCFF",color=blue,fontcolor="#880000"]; intro [label="Put the set of current particles\nequal to the set of all particles in the event"]; proto [label="Find all stable cones for the current set of particles"] add_proto [label="Add each stable cone (defined by the set\nof particles contained in the cone)\nto the list of protojets"]; remove [label="Remove all particles that are in stable cones\nfrom the list of current particles"]; end_algo [label="Run the Tevatron Run-II split-merge procedure\non the full list of protojets, with overlap parameter f",height=0.5]; node [shape=polygon,sides=4,orientation=45]; end_loop [label="No new stable cones have been found\nOR one has gone around the loop Npass times"]; node [style="invis",fixedsize=true]; proto_partner [width=0,height=0]; end_loop_partner [width=0,height=0]; { rank="same"; proto; proto_partner; } { rank="same"; end_loop; end_loop_partner; } edge [arrowsize=0.7]; intro -> proto -> add_proto -> remove -> end_loop; end_loop -> end_algo [label=" yes"]; end_loop -> end_loop_partner[weight=0,dir=none]; proto -> proto_partner[weight=0,dir=back]; end_loop_partner -> proto_partner[label=" no",samehead,sametail,dir=none]; } siscone-2.0.6.orig/doc/html/usage.html 0000644 0001750 0001750 00000042567 12132014066 016031 0 ustar sun sun
SISCone Documentation
Version 2.0.6
SISCone is written in C++ and is provided as a library. We describe below 3 ways of using it:
- Using the sample application
- Using the library (from source code)
- Using the FastJet plugin
For the e+e- events, we provide an implementation of SISCone in spherical coordinates. See here for details on how to use it.
Using the sample application
For simple applications, SISCone comes with a command-line application
Usage: ./siscone <args> Here is an exhaustive list of the arguments: Parameters control (with default values): -n <val>, --number=<val> : set the maximum number of particles allowed (all) -R <val>, --radius=<val> : set the radius (0.7) -f <val>, --fraction=<val>: set the overlap parameter (0.5) -p <val>, --ptmin=<val> : set the minimal pT for protojets (0) -e <val>, --event=<val> : set the event filename (events/single-event.dat) -n <val>, --npass=<val> : set the number of passes (0 for infinity) (0) -s <val>, --sm=<val> : set the variable for split-merge (pttilde) Output flags: --version : show version information -h, --help : show this message -v, --verbose: be verbose (on by default) -q, --quiet : be quiet |
The program outputs two files:
- particles.dat: the list of particles as a two-column file giving the rapidity y and azimuthal angle φ for each particle
- jets.dat: the first line gives the number of jets. Then comes the list of jets within 4 columns giving, for each jet, the (y, φ) coordinates of its centre, its pT and the number of particles it contains. The remaining part of the file lists the jet content. This is again given in 4 columns: the (y, φ) coordinates of the particle, its index in the initial list and the index of the jet to which it belongs.
Using the library
SISCone can be more conveniently used directly in C++ program linked against the SISCone library. There are basically two objects that are important for users:
Cmomentum: the 4-momentum class
(see momentum.h for details)
This class is used to store the property of one particle. It is defined through the 4-momentum coordinates of the particle e.g., to create a particle of momentum px py pz and energy E
Cmomentum particle=Cmomentum(px, py, pz, E); |
Csiscone: the SISCone jet finder
(see siscone.h for details)The Csiscone class is the main class of interest of the algorithm. It is the one that you want to use to calculate the jets from a given set of particles. The algorithm is called through the following members:
int Csisscone::compute_jets(vector<Cmomentum> &particles,
double R, double f, int n_pass_max=0, double ptmin=0.0,
Esplit_merge_scale _split_merge_scale=SM_pttilde);
int Csisscone::recompute_jets(double f, double ptmin=0.0,
Esplit_merge_scale _split_merge_scale=SM_pttilde);
|
- particles: the list of particles to deal with under the form of a STL vector of particles.
- R: the radius of the cone used to scan for stable cones (protocones)
- f: the overlap parameter. When splitting and merging protocones, two overlapping cones are split (resp. merged) when their overlapping pT is smaller (resp. larger) than a fraction f of the smallest pT of the parents.
- n_pass_max: maximum number of passes. When computing protocones, it happens that some particles do not enter into jet. We can therefore re-run the algorithm with those particles only. This parameter controls the number of such passes. It has been set to 1 by default. If you want to run the algorithm until all particles are associated with a jet or no new stable cone are found, set it to 0.
- ptmin: minimal pT for the protojets included in the split-merge process. At each step of the split-merge process, we remove jet candidates which have a pT less than ptmin.
- split_merge_scale: variable to use for split-merge (ordering and overlap fraction computation). This can be SM_pttilde, SM_Et, SM_mt or SM_pt, respectively corresponding to a p-scheme pT, the transverse energy ET, the transverse mass mT or the transverse momentum pT. We highly recommand to keep the default value SM_pttilde (see this note for details)
Remark: The algorithm has been placed inside the namespace siscone. Hence, you should either add the line using namespace siscone; on top of your applications, or prefix any call to the siscone library by siscone::.
Output
The result of calling compute_jets(...) or recompute_jets(...) is stored in the vector
vector<Cjet> Csiscone::jets; |
- Cjet::v: 4-momentum of the jet.
- Cjet::n: number of particles in the jet.
- Cjet::contents: jet contents. It is stored as a vector<int> listing the indices of the particles contained in the jet.
- Cjet::pass : pass at which the jet has been found (0 is the first, -1 means that the particle has not been included in the analysis i.e. it has infinite rapidity).
an illustrative example
Here follows an example which illustrates the usage of those objects (see also main.cpp in the scones tree)
01 #include <stdio.h> 02 #include <iostream> 03 #include "siscone/momentum.h" 04 #include "siscone/siscone.h" 05 06 #define R 0.7 07 #define f 0.5 08 #define f_alt 0.75 09 10 using namespace std; 11 using namespace siscone; 12 13 int main(int argc, char *argv[]){ 14 vector<Cmomentum> particles; // list of particles 15 Csiscone siscone; // main object for the cone algorithm 16 int i; // loop index 17 int N; // number of particles 18 double px,py,pz,E; // particles 4-momentum 19 char fline[512]; // line to read from a file 20 21 // read particles 22 FILE *flux; 23 flux = fopen("events/single-event.dat", "r"); 24 if (flux==NULL){ 25 cerr << "cannot read event" << endl; 26 return 1; 27 } 28 29 N=0; 30 while (fgets(fline, 512, flux)!=NULL){ 31 if (fline[0]!='#'){ // skip lines beginning with '#' 32 if (sscanf(fline, "%le%le%le%le", &px, &py, &pz, &E)==4){ 33 particles.push_back(Cmomentum(px, py, pz, E)); 34 N++; 35 } else { 36 cout << "error in reading event file Giving up." << endl; 37 fclose(flux); 38 return 2; 39 } 40 } 41 } 42 fclose(flux); 43 44 // compute jets 45 // first compute with multiple passes (default) 46 i=siscone.compute_jets(particles, R, f); 47 cout << " " << i << " jets found in multi-pass run" << endl; 48 49 // then, recompute it with a different f 50 i=siscone.recompute_jets(f_alt); 51 cout << " " << i << " jets found with alterntive f" << endl; 52 53 // compute jets with a single pass 54 i=siscone.compute_jets(particles, R, f, 1); 55 cout << " " << i << " jets found in single-pass run" << endl; 56 57 // show jets 58 vector<Cjet>::iterator it_j; 59 int i1; 60 fprintf(stdout, "# pT eta"); 61 fprintf(stdout, " phi px py pz E \n"); 62 for (it_j = siscone.jets.begin(), i1=0 ; 63 it_j != siscone.jets.end() ; it_j++, i1++){ 64 fprintf(stdout, "Jet %3d: %10.3f %8.3f %8.3f", 65 i1, it_j->v.perp(), it_j->v.eta, it_j->v.phi); 66 fprintf(stdout, " %10.3f %10.3f %10.3f %10.3f\n", 67 it_j->v.px, it_j->v.py, it_j->v.pz, it_j->v.E); 68 } 69 70 return 0; 71 } |
Using the FastJet plugin
SISCone is available as a plugin of the FastJet project. The plugin is
named SISConePlugin. Note that it requires at least
version 2.1 of FastJet. See
the FastJet website for details.
The spherical version of SISCone
To allow clustering of e+e– events, an implementation of SISCone in spherical coordinates is available (as of version 2.0 of SISCone).
Its usage is very similar to that of the basic implementation of SISCone, so we just highlight the few differences here:
- The spherical version, uses energy E and normal angles,
rather than the longitudinally boost-invariant pt,
rapidity and azimuth. Specifically:
- The distance between a pair of particle is the angle between the pair particles (equivalently the the distance on the surface of a unit sphere). Similarily, the cone radius R is also defined as the cone half-opening angle.
- During the split--merge step, we use the energy of the
particles rather than their transverse momentum. However, as
in the standard situation where ordering the protojets
in pt led to infrared-unsafeties, ordering
the protojets in energy in the spherical case also leads to
infrared unsafeties. To solve that problem, we introduce the
new variable
and use it to order the protojets. Note that to compute the overlap fraction, we keep using the plain energy (which is perfectly safe in this case). In practice, when invoking the clustering, this corresponds to the default choice ofSM_Etildefor the split--merge scale. If one rather wants to use E despite its infrared-unsafety problems, one can specifySM_Einstead.
- The structure remains the same as for the basic implementation but
the class names have been prefixed by
CSphinstead of justC. For example, the list of 4-momenta should be of theCSphmomentumtype (1), the clustering is done usingCSphsisconeand the jets are stored inCSphjetobjects. - The classes for the spherical implementation are placed under
the
siscone_sphericalnamespace. - The library is called
libsiscone_spherical.{a,so}rather thanlibsiscone.{a,so}. - The spherical version of SISCone is available as a FastJet plugin
named
SISConeSphericalPlugin.
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For each circle,\n\ compute the angle of its center C relative to i, \n\ (zeta = atan(d phi_{iC}/d y_{iC}))"]; sort[label="Sort the circles into increasing angle zeta"]; init_cone[label="For the first circle in this order, calculate the total\n\ momentum and checkxor for the cones that it defines.\n\ Consider all 4 permutations of edge points being included\n\ or excluded. Call these the 'current cones'"]; node [shape=polygon,sides=2,orientation=45]; browse_current[label = "for each of the 4 current cones"]; node [shape=box,orientation=0,style=filled,fillcolor="#CCCCFF",color=blue,fontcolor="#880000"]; test_cone1[label="this cone has not yet been found add\nit to the list of distinct cones"]; test_cone2[label="if this cone has not yet been labelled as unstable, establish\n\ if the in/out status of the edge particles (with respect to the cone\n\ momentum axis) is the same as when defining the cone; if it is\n\ not, label the cone as unstable"]; node [style="invis",fixedsize=true]; end_current[width=0,height=0]; node [shape=box,style=filled,fillcolor="#CCCCFF",color=blue,fontcolor="#880000",fixedsize=false]; update_cone[label="Move to the next circle in order. It differs from the previous\n\ one either by a particle entering the circle, or one leaving the\n\ circle. Calculate the momentum for the new circle by adding (or\n\ removing) the momentum of the particle that has entered (left); the\n\ checkxor can be updated by XORing with the label of that particle."]; node [shape=polygon,sides=4,orientation=45]; until[label="test if all circles are considered"]; node [shape=box,orientation=0,style=filled,fillcolor="#CCCCFF",color=blue,fontcolor="#880000"]; node [shape=polygon,sides=4,orientation=45]; next_particle[label="move to the next particle: increment i, if possible"]; node [shape=box,orientation=0,style=filled,fillcolor="#CCCCFF",color=blue,fontcolor="#880000"]; node [shape=polygon,sides=2,orientation=45]; browse_proto[label = "for each of the cones labelled as unstable"]; node [shape=box,orientation=0,style=filled,fillcolor="#CCCCFF",color=blue,fontcolor="#880000"]; node [shape=polygon,sides=4,orientation=45]; final_check[label="Explicitly check if the cone is stable"]; node [shape=box,sides=4,orientation=0]; check_ok[label="add it to the list of stable cones (protojets)"]; node [style="invis",fixedsize=true]; end_proto[width=0,height=0]; edge [arrowsize=0.7]; init -> vicinity -> sort -> init_cone -> browse_current -> test_cone1 -> test_cone2; test_cone2 -> end_current[dir=none]; end_current -> update_cone -> until -> next_particle -> browse_proto -> final_check; final_check -> check_ok[label="yes"]; check_ok -> end_proto[dir=none]; } // virtual nodes ///////////////// { node [style="invis",fixedsize=true]; vicinity_p[width=0,height=0]; init_cone_p[width=0,height=0]; browse_current_p[width=0,height=0]; end_current_p[width=0,height=0]; until_p[width=0,height=0]; next_particle_p[width=0,height=0]; browse_proto_p[width=0,height=0]; final_p[width=0,height=0]; end_proto_p[width=0,height=0]; } { rank="same"; vicinity; vicinity_p; } { rank="same"; init_cone; init_cone_p; } { rank="same"; browse_current; browse_current_p; } { rank="same"; end_current; end_current_p; } { rank="same"; until; until_p; } { rank="same"; next_particle; next_particle_p; } { rank="same"; browse_proto; browse_proto_p; } { rank="same"; final_check; final_p; } { rank="same"; end_proto; end_proto_p; } edge [arrowsize=0.7]; end_current->end_current_p[weight=0,dir=none]; browse_current->browse_current_p[weight=0,dir=back]; end_current_p->browse_current_p[samehead,sametail,dir=none]; until->until_p[weight=0,dir=none]; init_cone->init_cone_p[weight=0,dir=back]; until_p->init_cone_p[label=" no",samehead,sametail,dir=none]; next_particle->next_particle_p[weight=0,dir=none]; vicinity->vicinity_p[weight=0,dir=back]; next_particle_p->vicinity_p[label=" yes",samehead,sametail,dir=none]; end_proto->end_proto_p[weight=0,dir=none]; final_check->final_p[headlabel="no",weight=0]; browse_proto->browse_proto_p[weight=0,dir=back]; end_proto_p->final_p[samehead,sametail,dir=none]; final_p->browse_proto_p[samehead,sametail,dir=none]; } siscone-2.0.6.orig/doc/latex/ 0000755 0001750 0001750 00000000000 12132014043 014165 5 ustar sun sun siscone-2.0.6.orig/doc/devel/ 0000755 0001750 0001750 00000000000 12132014043 014147 5 ustar sun sun siscone-2.0.6.orig/doc/devel/html/ 0000755 0001750 0001750 00000000000 12132014043 015113 5 ustar sun sun siscone-2.0.6.orig/doc/devel/html/footer.html 0000644 0001750 0001750 00000000762 12132014043 017304 0 ustar sun sun
The SISCone project has been developed by Gavin Salam and Gregory Soyez
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