[Rivet-svn] r3577 - in trunk: data/anainfo data/plotinfo data/refdata src/Analyses

blackhole at projects.hepforge.org blackhole at projects.hepforge.org
Thu Feb 23 18:52:27 GMT 2012


Author: holsch
Date: Thu Feb 23 18:52:27 2012
New Revision: 3577

Log:
Add ATLAS Kshort and Lambda analysis

Added:
   trunk/data/anainfo/ATLAS_2011_I944826.info
   trunk/data/plotinfo/ATLAS_2011_I944826.plot
   trunk/data/refdata/ATLAS_2011_I944826.aida
   trunk/src/Analyses/ATLAS_2011_I944826.cc
Modified:
   trunk/data/anainfo/Makefile.am
   trunk/data/plotinfo/Makefile.am
   trunk/data/refdata/Makefile.am
   trunk/src/Analyses/Makefile.am

Added: trunk/data/anainfo/ATLAS_2011_I944826.info
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ trunk/data/anainfo/ATLAS_2011_I944826.info	Thu Feb 23 18:52:27 2012	(r3577)
@@ -0,0 +1,38 @@
+Name: ATLAS_2011_I944826
+Year: 2011
+Summary: KS0 and Lambda production at 0.9 and 7 TeV with ATLAS
+Experiment: ATLAS
+Collider: LHC
+InspireID: 944826
+Status: VALIDATED
+Authors:
+ - Holger Schulz <holger.schulz at physik.hu-berlin.de>
+References:
+ - arXiv:1111.1297v2 [hep-ex]
+ - Phys.Rev. D85 (2012) 012001
+RunInfo:
+  QCD events, 900GeV and 7TeV, Lambdas and Kshorts must be able to decay.
+  Allow only charged decay modes to improve efficiency.
+NumEvents: 1000000
+NeedCrossSection: no
+Beams: [p+, p+]
+Energies: [900, 7000]
+Description:
+  'The production of Kshort and Lambda hadrons is studied in inelastic pp collisions at sqrt(s) = 0.9 and 7 TeV collected with the ATLAS detector at the LHC using a minimum-bias trigger. The observed distributions of transverse momentum, rapidity, and multiplicity are corrected to hadron level in a model-independent way within well defined phase-space regions. The distribution of the production ratio of Lambdabar to Lambda baryons is also measured. The results are compared with various Monte Carlo simulation models. Although most of these models agree with data to within 15% in the Kshort distributions, substantial disagreements with data are found in the Lambda distributions of transverse momentum. '
+BibKey: Aad:2011hd
+BibTeX: '@article{Aad:2011hd,
+      author         = "Aad, Georges and others",
+      title          = "{Kshort and Lambda production in pp interactions at
+                        sqrt(s) = 0.9 and 7 TeV measured with the ATLAS detector
+                        at the LHC}",
+      collaboration  = "ATLAS Collaboration",
+      journal        = "Phys.Rev.",
+      volume         = "D85",
+      pages          = "012001",
+      year           = "2012",
+      eprint         = "1111.1297",
+      archivePrefix  = "arXiv",
+      primaryClass   = "hep-ex",
+      reportNumber   = "CERN-PH-EP-2011-168",
+      SLACcitation   = "%%CITATION = ARXIV:1111.1297;%%",
+}'

Modified: trunk/data/anainfo/Makefile.am
==============================================================================
--- trunk/data/anainfo/Makefile.am	Mon Feb 20 18:01:05 2012	(r3576)
+++ trunk/data/anainfo/Makefile.am	Thu Feb 23 18:52:27 2012	(r3577)
@@ -34,6 +34,7 @@
   ATLAS_2011_I919017.info \
   ATLAS_2011_I925932.info \
   ATLAS_2011_I926145.info \
+  ATLAS_2011_I944826.info \
   ATLAS_2011_S9225137.info \
   ATLAS_2012_I1083318.info \
   ATLAS_2012_I1084540.info \

Added: trunk/data/plotinfo/ATLAS_2011_I944826.plot
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ trunk/data/plotinfo/ATLAS_2011_I944826.plot	Thu Feb 23 18:52:27 2012	(r3577)
@@ -0,0 +1,120 @@
+# BEGIN PLOT /ATLAS_2011_I944826/d01-x01-y01
+Title=$K_S^0$ transverse momentum, $\sqrt{s}=7000$~GeV
+XLabel=$p_\perp[\text{GeV/c}]$
+YLabel=$1/N_\text{KS}\; \text{d}N_\text{KS}/\text{d}p_\perp$
+LogY=1
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d02-x01-y01
+Title=$K_S^0$ rapidity, $\sqrt{s}=7000$~GeV
+XLabel=$y$
+YLabel=$1/N_\text{KS}\; \text{d}N_\text{KS}/\text{d}y$
+LogY=0
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d03-x01-y01
+Title=$K_S^0$ multiplicity, $\sqrt{s}=7000$~GeV
+XLabel=$K_S^0$ multiplicity
+YLabel=$1/N_\text{ev}\; \text{d}N_\text{ev}/\text{d}N_\text{KS}$
+LogY=0
+YMin=-0.2
+XCustomMajorTicks=0	0	1	1	2	2	3	3
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d04-x01-y01
+Title=$K_S^0$ transverse momentum, $\sqrt{s}=900$~GeV
+XLabel=$p_\perp[\text{GeV/c}]$
+YLabel=$1/N_\text{KS}\; \text{d}N_\text{KS}/\text{d}p_\perp$
+LogY=1
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d05-x01-y01
+Title=$K_S^0$ rapidity, $\sqrt{s}=900$~GeV
+XLabel=$y$
+YLabel=$1/N_\text{KS}\; \text{d}N_\text{KS}/\text{d}y$
+LogY=0
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d06-x01-y01
+Title=$K_S^0$ multiplicity, $\sqrt{s}=900$~GeV
+XLabel=$K_S^0$ multiplicity
+YLabel=$1/N_\text{ev}\; \text{d}N_\text{ev}/\text{d}N_\text{KS}$
+LogY=0
+YMin=-0.2
+XCustomMajorTicks=0	0	1	1	2	2	3	3
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d07-x01-y01
+Title=$\Lambda$ transverse momentum, $\sqrt{s}=7000$~GeV
+XLabel=$p_\perp[\text{GeV/c}]$
+YLabel=$1/N_\Lambda\; \text{d}N_\Lambda/\text{d}p_\perp$
+LogY=1
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d08-x01-y01
+Title=$\Lambda$ rapidity, $\sqrt{s}=7000$~GeV
+XLabel=$y$
+YLabel=$1/N_\Lambda\; \text{d}N_\Lambda/\text{d}y$
+LogY=0
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d09-x01-y01
+Title=$\Lambda$ multiplicity, $\sqrt{s}=7000$~GeV
+XLabel=$\Lambda$ multiplicity
+YLabel=$1/N_\text{ev}\; \text{d}N_\text{ev}/\text{d}N_\Lambda$
+LogY=0
+YMin=-0.2
+XCustomMajorTicks=0	0	1	1	2	2	3	3
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d10-x01-y01
+Title=$\Lambda$ transverse momentum, $\sqrt{s}=900$~GeV
+XLabel=$p_\perp[\text{GeV/c}]$
+YLabel=$1/N_\Lambda\; \text{d}N_\Lambda/\text{d}p_\perp$
+LogY=1
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d11-x01-y01
+Title=$\Lambda$ rapidity, $\sqrt{s}=900$~GeV
+XLabel=$y$
+YLabel=$1/N_\Lambda\; \text{d}N_\Lambda/\text{d}y$
+LogY=0
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d12-x01-y01
+Title=$\Lambda$ multiplicity, $\sqrt{s}=900$~GeV
+XLabel=$\Lambda$ multiplicity
+YLabel=$1/N_\text{ev}\; \text{d}N_\text{ev}/\text{d}N_\Lambda$
+LogY=0
+YMin=-0.2
+XCustomMajorTicks=0	0	1	1	2	2	3	3
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d14-x01-y01
+Title=Production ratio of $\bar{\Lambda}$ and $\Lambda$ vs. $p_\perp$, $\sqrt{s}=7000$~GeV
+XLabel=$p_\perp$~[GeV]
+YLabel=ratio $(\bar{\Lambda}/\Lambda)$
+LogY=0
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d13-x01-y01
+Title=Production ratio of $\bar{\Lambda}$ and $\Lambda$ vs. $|y|$, $\sqrt{s}=7000$~GeV
+XLabel=$|y|$
+YLabel=ratio $(\bar{\Lambda}/\Lambda)$
+LogY=0
+# END PLOT
+
+
+# BEGIN PLOT /ATLAS_2011_I944826/d16-x01-y01
+Title=Production ratio of $\bar{\Lambda}$ and $\Lambda$ vs. $p_\perp$, $\sqrt{s}=900$~GeV
+XLabel=$p_\perp$~[GeV]
+YLabel=ratio $(\bar{\Lambda}/\Lambda)$
+LogY=0
+# END PLOT
+
+# BEGIN PLOT /ATLAS_2011_I944826/d15-x01-y01
+Title=Production ratio of $\bar{\Lambda}$ and $\Lambda$ vs. $|y|$, $\sqrt{s}=900$~GeV
+XLabel=$|y|$
+YLabel=ratio $(\bar{\Lambda}/\Lambda)$
+LogY=0
+# END PLOT

Modified: trunk/data/plotinfo/Makefile.am
==============================================================================
--- trunk/data/plotinfo/Makefile.am	Mon Feb 20 18:01:05 2012	(r3576)
+++ trunk/data/plotinfo/Makefile.am	Thu Feb 23 18:52:27 2012	(r3577)
@@ -27,6 +27,7 @@
   ATLAS_2011_I919017.plot  \
   ATLAS_2011_I925932.plot  \
   ATLAS_2011_I926145.plot  \
+  ATLAS_2011_I944826.plot  \
   ATLAS_2011_S9225137.plot \
   ATLAS_2012_I1083318.plot \
   ATLAS_2012_I1084540.plot \

Added: trunk/data/refdata/ATLAS_2011_I944826.aida
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ trunk/data/refdata/ATLAS_2011_I944826.aida	Thu Feb 23 18:52:27 2012	(r3577)
@@ -0,0 +1,1190 @@
+<?xml version="1.0" ?>
+<!DOCTYPE aida SYSTEM "http://aida.freehep.org/schemas/3.3/aida.dtd">
+<aida version="3.3">
+  <implementation version="1.1" package="Rivet"/>
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+    <dimension dim="1" title="$1/N_\text{KS}\; \text{d}N_\text{KS}/\text{d}p_\perp$"/>
+    <annotation>
+      <item key="Title" value="$K_S^0$ transverse momentum, $\sqrt{s}=7000$~GeV" sticky="true"/>
+      <item key="AidaPath" value="/REF/ATLAS_2011_I944826/d01-x01-y01" sticky="true"/>
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+  </dataPointSet>
+</aida>

Modified: trunk/data/refdata/Makefile.am
==============================================================================
--- trunk/data/refdata/Makefile.am	Mon Feb 20 18:01:05 2012	(r3576)
+++ trunk/data/refdata/Makefile.am	Thu Feb 23 18:52:27 2012	(r3577)
@@ -32,6 +32,7 @@
   ATLAS_2011_I919017.aida        \
   ATLAS_2011_I925932.aida        \
   ATLAS_2011_I926145.aida        \
+  ATLAS_2011_I944826.aida        \
   ATLAS_2011_S9225137.aida       \
   ATLAS_2012_I1083318.aida       \
   ATLAS_2012_I1084540.aida       \

Added: trunk/src/Analyses/ATLAS_2011_I944826.cc
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ trunk/src/Analyses/ATLAS_2011_I944826.cc	Thu Feb 23 18:52:27 2012	(r3577)
@@ -0,0 +1,290 @@
+// -*- C++ -*-
+#include "Rivet/Analysis.hh"
+#include "Rivet/RivetAIDA.hh"
+#include "Rivet/Tools/Logging.hh"
+#include "Rivet/Tools/ParticleIdUtils.hh"
+#include "Rivet/Projections/ChargedFinalState.hh"
+#include "Rivet/Projections/UnstableFinalState.hh"
+#include "LWH/Histogram1D.h"
+#include "HepMC/GenParticle.h"
+#include "HepMC/GenVertex.h"
+
+//using namespace std;
+//using namespace Rivet;
+
+
+namespace Rivet {
+
+  class ATLAS_2011_I944826 : public Analysis {
+  public:
+
+    /// Constructor
+    ATLAS_2011_I944826()
+      : Analysis("ATLAS_2011_I944826")
+    {
+        setBeams(PROTON, PROTON);
+        _sum_w_ks     = 0.0;
+        _sum_w_lambda = 0.0;
+        _sum_w_passed = 0.0;
+    }
+
+
+  public:
+
+    /// Book histograms and initialise projections before the run
+    void init() {
+
+      UnstableFinalState ufs(-MAXRAPIDITY, MAXRAPIDITY, 100*MeV);
+      addProjection(ufs, "UFS");
+      
+      ChargedFinalState  cfs(-2.5, 2.5, 100*MeV);
+      addProjection(cfs, "CFS");
+
+      if (fuzzyEquals(sqrtS()*GeV, 7000, 1E-3)) {
+        _hist_Ks_pT   = bookHistogram1D(1,1,1);
+        _hist_Ks_y    = bookHistogram1D(2,1,1);
+        _hist_Ks_mult = bookHistogram1D(3,1,1);
+        _hist_L_pT    = bookHistogram1D(7,1,1);
+        _hist_L_y     = bookHistogram1D(8,1,1);
+        _hist_L_mult  = bookHistogram1D(9,1,1);
+        _hist_Ratio_v_y      = bookDataPointSet(13,1,1);
+        _hist_Ratio_v_pT     = bookDataPointSet(14,1,1);
+        _temp_lambda_v_y.reset(    new LWH::Histogram1D(10, 0.0, 2.5));
+        _temp_lambdabar_v_y.reset( new LWH::Histogram1D(10, 0.0, 2.5));
+        _temp_lambda_v_pT.reset(   new LWH::Histogram1D(18, 0.5, 4.1));
+        _temp_lambdabar_v_pT.reset(new LWH::Histogram1D(18, 0.5, 4.1));
+      } 
+      else if (fuzzyEquals(sqrtS()*GeV, 900, 1E-3)) {
+        _hist_Ks_pT   = bookHistogram1D(4,1,1);
+        _hist_Ks_y    = bookHistogram1D(5,1,1);
+        _hist_Ks_mult = bookHistogram1D(6,1,1);
+        _hist_L_pT    = bookHistogram1D(10,1,1);
+        _hist_L_y     = bookHistogram1D(11,1,1);
+        _hist_L_mult  = bookHistogram1D(12,1,1);
+        _hist_Ratio_v_y      = bookDataPointSet(15,1,1); 
+        _hist_Ratio_v_pT     = bookDataPointSet(16,1,1);
+        _temp_lambda_v_y.reset(    new LWH::Histogram1D(5, 0.0, 2.5));
+        _temp_lambdabar_v_y.reset( new LWH::Histogram1D(5, 0.0, 2.5));
+        _temp_lambda_v_pT.reset(   new LWH::Histogram1D(8, 0.5, 3.7));
+        _temp_lambdabar_v_pT.reset(new LWH::Histogram1D(8, 0.5, 3.7));
+      }
+    }
+
+    // This function is required to impose the flight time cuts on Kaons and Lambdas
+    inline double getPerpFlightDistance(const Rivet::Particle& p) {
+      const HepMC::GenParticle& genp = p.genParticle();
+      HepMC::GenVertex* prodV = genp.production_vertex();
+      HepMC::GenVertex* decV  = genp.end_vertex();
+      const HepMC::ThreeVector prodPos = prodV->point3d();
+      if (decV) {
+        const HepMC::ThreeVector decPos =  decV->point3d();
+        double dy = prodPos.y() - decPos.y();
+        double dx = prodPos.x() - decPos.x();
+        return sqrt(dx*dx + dy*dy);
+      }
+      else return 9999999.;
+    }
+
+    inline bool daughtersSurviveCuts(const Rivet::Particle& p) {
+      // We require the Kshort or Lambda to decay into two charged 
+      // particles with at least 100MeV pT inside acceptance region
+      const HepMC::GenParticle& genp = p.genParticle();
+      HepMC::GenVertex* decV  = genp.end_vertex();
+      bool decision = true;
+
+      if (!decV) return false;
+      if (decV->particles_out_size() == 2) {
+        std::vector<double> pTs;
+        std::vector<int> charges;
+        std::vector<double> etas;
+        for (HepMC::GenVertex::particles_out_const_iterator pp = decV->particles_out_const_begin() ;
+             pp != decV->particles_out_const_end() ; ++pp) {
+          pTs.push_back((*pp)->momentum().perp());
+          etas.push_back(fabs((*pp)->momentum().eta()));
+          charges.push_back( Rivet::PID::threeCharge((*pp)->pdg_id()));
+          //(*pp)->print();
+        }
+        if ( (pTs[0]/Rivet::GeV < 0.1) || (pTs[1]/Rivet::GeV < 0.1) ) {
+          decision = false;
+          MSG_DEBUG("Failed pT cut: " << pTs[0]/Rivet::GeV << " " << pTs[1]/Rivet::GeV);
+        }
+        if ( etas[0] > 2.5 || etas[1] > 2.5 ) {
+          decision = false;
+          MSG_DEBUG("Failed eta cut: " << etas[0] << " " << etas[1]);
+        }
+        if ( charges[0] * charges[1] >= 0 ) {
+          decision = false;
+          MSG_DEBUG("Failed opposite charge cut: " << charges[0] << " " << charges[1]);
+        }
+      }
+      else {
+        decision = false;
+        MSG_DEBUG("Failed nDaughters cut: " << decV->particles_out_size());
+      }
+
+      return decision;
+    }
+
+    /// Perform the per-event analysis
+    void analyze(const Event& event) {
+      const double weight = event.weight();
+
+      // ATLAS MBTS trigger requirement of at least one hit in either hemisphere
+      const ChargedFinalState& cfs = applyProjection<ChargedFinalState>(event, "CFS");
+      int n_mbts = 0;
+      foreach (const Particle& p, cfs.particles()) {
+        const double eta = fabs(p.momentum().eta());
+        if (inRange(eta, 2.09, 3.84)) n_mbts++; 
+      }
+
+      if (n_mbts < 1) {
+        MSG_DEBUG("Failed trigger cut");
+        vetoEvent;
+      }
+
+      // Veto event also when we find less than 2 particles in the acceptance region of type 211,2212,11,13,321
+      int n_stable = 0;
+      foreach (const Particle& p, cfs.particles()) {
+        const PdgId pid = fabs(p.pdgId());
+        if (pid == 11 || pid == 13 || pid == 211 || pid == 321 || pid == 2212) n_stable++;
+      }
+
+      if (n_stable < 2) {
+        MSG_DEBUG("Failed stable particle cut");
+        vetoEvent;
+      }
+      _sum_w_passed += weight;
+
+      // This ufs holds all the Kaons and Lambdas
+      const UnstableFinalState& ufs = applyProjection<UnstableFinalState>(event, "UFS");
+     
+      // Some conters
+      int n_KS0 = 0; 
+      int n_LAMBDA = 0; 
+
+      // Particle loop
+      foreach (const Particle& p, ufs.particles()) {
+       
+        // General particle quantities
+        const double pT = p.momentum().pT()*GeV;
+        const double y = p.momentum().rapidity();
+        const PdgId pid = fabs(p.pdgId());
+
+        double flightd = 0.0;
+
+        // Look for Kaons, Lambdas
+        switch (pid) {
+        
+          case K0S:
+            flightd = getPerpFlightDistance(p);
+            if (!inRange(flightd, 4., 450.) ){
+              MSG_DEBUG("Kaon failed flight distance cut:" << flightd);
+              break;
+            }
+            if (daughtersSurviveCuts(p) ) {
+              _hist_Ks_y ->fill(y,  weight);
+              _hist_Ks_pT->fill(pT, weight);
+              
+              _sum_w_ks += weight;
+              n_KS0++;
+            }
+          break;
+
+          case LAMBDA:
+            if (pT < 0.5) { // Lambdas have an additional pT cut of 500 MeV
+              MSG_DEBUG("Lambda failed pT cut:" << pT);
+              break; 
+            }
+            flightd = getPerpFlightDistance(p);
+            if (!inRange(flightd, 17., 450.)) {
+              MSG_DEBUG("Lambda failed flight distance cut:" << flightd);
+              break;
+            }
+            if ( daughtersSurviveCuts(p) ) {
+              if (p.pdgId() == 3122) {
+                _temp_lambda_v_y    ->fill(fabs(y), weight);
+                _temp_lambda_v_pT   ->fill(pT,      weight);
+                
+                _hist_L_y->fill( y,  weight);
+                _hist_L_pT->fill(pT, weight);
+               
+                _sum_w_lambda += weight;
+                n_LAMBDA++;
+                }
+              
+              else if (p.pdgId() == -3122) {
+                _temp_lambdabar_v_y ->fill(fabs(y), weight);
+                _temp_lambdabar_v_pT->fill(pT,      weight);
+              }
+            }
+          break;
+      
+        } // End of switch
+      
+      }// End of particle loop
+
+      // Fill multiplicity histos
+      _hist_Ks_mult->fill(n_KS0, weight);
+      _hist_L_mult->fill(n_LAMBDA, weight);
+    }
+      
+
+
+    /// Normalise histograms etc., after the run
+    void finalize() {
+      MSG_INFO("Events that pass the trigger: " << _sum_w_passed);
+      MSG_INFO("Kshort events: " << _sum_w_ks);
+      MSG_INFO("Lambda events: " << _sum_w_lambda);
+
+      scale(_hist_Ks_pT,   1.0/_sum_w_ks);
+      scale(_hist_Ks_y,    1.0/_sum_w_ks);
+      scale(_hist_Ks_mult, 1.0/_sum_w_passed);
+
+      scale(_hist_L_pT,   1.0/_sum_w_lambda);
+      scale(_hist_L_y,    1.0/_sum_w_lambda);
+      scale(_hist_L_mult, 1.0/_sum_w_passed);
+     
+
+      // Division of histograms to obtain lambdabar/lambda ratios
+      if (fuzzyEquals(sqrtS()*GeV, 7000, 1E-3)) {
+        histogramFactory().divide(histoPath("d13-x01-y01"),  *_temp_lambdabar_v_y, *_temp_lambda_v_y );
+        histogramFactory().divide(histoPath("d14-x01-y01"), *_temp_lambdabar_v_pT, *_temp_lambda_v_pT);
+      }                                                                                              
+      else if (fuzzyEquals(sqrtS()*GeV, 900, 1E-3)) {                                                
+        histogramFactory().divide(histoPath("d15-x01-y01"),  *_temp_lambdabar_v_y, *_temp_lambda_v_y );
+        histogramFactory().divide(histoPath("d16-x01-y01"), *_temp_lambdabar_v_pT, *_temp_lambda_v_pT);
+      }
+    }
+
+
+
+  private:
+
+    // Data members like post-cuts event weight counters go here
+    double _sum_w_ks    ;
+    double _sum_w_lambda;
+    double _sum_w_passed;
+
+    /// @name Histograms
+    AIDA::IHistogram1D *_hist_Ks_pT;
+    AIDA::IHistogram1D *_hist_Ks_y;
+    AIDA::IHistogram1D *_hist_Ks_mult;
+
+    AIDA::IHistogram1D *_hist_L_pT;
+    AIDA::IHistogram1D *_hist_L_y;
+    AIDA::IHistogram1D *_hist_L_mult;
+
+    AIDA::IDataPointSet *_hist_Ratio_v_pT;
+    AIDA::IDataPointSet *_hist_Ratio_v_y;
+    
+    shared_ptr<LWH::Histogram1D> _temp_lambda_v_y,  _temp_lambdabar_v_y;
+    shared_ptr<LWH::Histogram1D> _temp_lambda_v_pT, _temp_lambdabar_v_pT;
+  };
+
+
+
+  // The hook for the plugin system
+  //DECLARE_RIVET_PLUGIN(ATLAS_2011_I944826);
+  AnalysisBuilder<ATLAS_2011_I944826> plugin_ATLAS_2011_I944826;
+
+}

Modified: trunk/src/Analyses/Makefile.am
==============================================================================
--- trunk/src/Analyses/Makefile.am	Mon Feb 20 18:01:05 2012	(r3576)
+++ trunk/src/Analyses/Makefile.am	Thu Feb 23 18:52:27 2012	(r3577)
@@ -64,6 +64,7 @@
     ATLAS_2011_I919017.cc \
     ATLAS_2011_I925932.cc \
     ATLAS_2011_I926145.cc \
+    ATLAS_2011_I944826.cc \
     ATLAS_2012_I1084540.cc
 if ENABLE_UNVALIDATED
 RivetATLASAnalyses_la_SOURCES += \


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