Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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6/20/20016/20/2001

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From n-Tuples

tob-Tags

?

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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Next goal: Boosted Sphericity

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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PJet

PTrackb meson

Boost

Detector at rest b meson at rest

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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Next goal: Boosted Sphericity

Boost = f(meson mass)Define asymmetry A where A=f(boost)=f(meson

mass) as

with i running over all tracks

Use as new cut parameter

yxk i

i

ki

ki

p

pA

,

2

lightb

lightb

AA

AA

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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DataData used to check feasibility of parameters:• 2000 events QCD• 2000 events inclusive b b-bar0 min bias, jet Pt>10GeV2 as for now I need

(reco’ed) jets only,generated with Onne’s and Pythia’s help

Ran the whole chain until d0recoanalyze p08-10

Using SEED to analyze d0recoanalyze output n-tuple

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED (formerly known as D0nau)

Loads of changes since last talk, mainly• renamed to SEED,• documentation on the web:

http://www-d0.fnal.gov/nikhef• based on ROOT’s TTree: Much faster, able to

handle huge amounts of data• easier to use interfaces• new cvs packages seed and seed_framework• might be added as standard ROOT package• BUT: Still tested only under Windows• ROOT benefits a lot: found about 0.5 ROOT

bugs/day…

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED – ProblemsMainly due to ROOT:• Only few ROOT users use Windows, many bug

don’t exist in Windows• ROOT still under development, severe changes

producing severe bugs, but incredibly helpful development team!

Efforts to get it under control:• Send a bug report every 2nd day• Finally able to compile (and debug) ROOT for

Windows locally on D0NTWG03 (dual 1.3GHz Xeon 4, 1GB RAM), formerly allocated as Windows build machine for L3, now allocated to compile ROOT, only one user so far…

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED – Why?• Common analysis classes• OO code• reusable code• n-tuple independent code• looks & feels like ROOT code• use all the ROOT code already there

It so much looks like ROOT it might soon be a part of it!

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED – What?1. Define a mapping (called “seeds”) from n-

tuple column to class member2. SEED converts n-tuple into a file containing

data in classes, not in columns, using this mapping

3. Access data in classes in file, use classes’ (and ROOT’s) methods to analyze and plot your data

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED – main()

using namespace seed;

int main(int argc, char* argv[]){

TEventSample* pEventSample =

TEventSample::Load("../jets.root");

// create the data objects

TJCCGJet jet(pEventSample);

TOPRTParticle prt(pEventSample);

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED – main() (cont.)

for (iEvent=0; iEvent< pEventSample->GetNEvents(); iEvent++){

pEventSample->SetEvent(iEvent);

for (iJet=0; iJet< jet.Size(); iJet++){

dPhiJet=jet[iJet].Get4Vec().Phi();

for (int iPrt=0; iPrt < prt.Size(); iPrt++){

dPhi=prt[iPrt].GetTrack().Get4Vec().Phi();

h1.Fill((dPhi-dPhiJet)/kPI);

}; // for Particles

}; // for Jets

}; // for Event

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED – Seeds (Header)#include "seed/TCaloJet.h"

#include "seed/TSeed.h"

namespace seed{

MAKE_SEED( TCaloJet, TJCCGJet )

}

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED – Seeds (Source 1/3)#include "TJCCGJet.h"#include "seed/TSingleEntryTree.h"

namespace seed {

bool TJCCGJet_Seed::FillSeedData(TSingleEntryTree &tree, const int iEventNo) {

--- Fill data from n-tuple into SEED ---

return true;}} // end namespace seed

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED – Seeds (Source 2/3)In …::FillSeedData(…):tree.SetBranch("JCCG");

for (int iJet = 0; iJet<(int)tree.GetValue("JCCGnjet"); iJet++)

{

TCaloJet* pJet=NewEntry();

tree.SetIndex(iJet);

--- initialize pJet with data from n-tuple ---}

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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From TCaloJet’s header:TCaloJet& TCaloJet::Set(const TLorentzVector& lv,

const double dWidthEta, const double dWidthPhi, const double dEMF, const int iN90);

pJet->Set( TLorentzVector(tree.GetValue("JCCGPx"), tree.GetValue("JCCGPy"), tree.GetValue("JCCGPz"), tree.GetValue("JCCGE")), tree.GetValue("JCCGEtaW"), tree.GetValue("JCCGPhiW"), tree.GetValue("JCCGEMF"), tree.GetValue("JCCGn90"));

SEED – Seeds (Source 3/3)

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED – n-Tuple to Class#include "seed/TEventSample.h"

#include "TJCCGJet.h"

#include "TOPRTParticle.h"

using namespace seed;

int main(int argc, char* argv[])

{

TEventSample es;

es.Create("bbbar.ntpl","bbbar.root");

return 0;

}

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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SEED – Get it, it’s free!• Look at http://www-d0.fnal.gov/nikhef to

download the package.• Or d0-cvs checkout seed and seed_framework.• Or ask me to send you a copy by email.

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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6/20/20016/20/2001

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SEED – The result: HEP classes

Or: HEPEVT+++Discussion on1. Design of standard MC classes

• Particle• Branching Ratios• Stack (decay tree)• PDG connection

2. Design of standard Physics Objects classes• Feasibility• Interfaces• Analysis methods

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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6/20/20016/20/2001

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HEP ClassesCurrently 14 members from 5 experiments

D0, CDF, ALICE, BaBar, Atlas

Participate or inform yourself athttp://listserv.fnal.gov/archives/root_hep_classes.html

or send me an email.

First meeting during ROOT workshop, see status report athttp://www-root.fnal.gov/root2001/presentations/session6/HEP%20(Particle)%20Classes%20in%20Root.

pdf

Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The

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6/20/20016/20/2001

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HEP Classes - Status• PDG implementations in StdHep++ and ROOT will

be merged (incl. branching ratios)• Discussion on how to implement vertex and stack

class, using ALICE and StdHep++ libraries as starting point; review of both implementations w.r.t. requirements specified during discussion session

• Physics Objects: Many doubts (Politics? Do experiments share a non-trivial part of the results of their event reconstruction? Will we all die before we have a standard set of classes?). Going to discuss feasibility on actual (example) implementation.