diff --git a/NPLib/Detectors/LEPS/CMakeLists.txt b/NPLib/Detectors/LEPS/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9b35d7a28c5eeeb79fa6b3dff12e4415acf5ea36
--- /dev/null
+++ b/NPLib/Detectors/LEPS/CMakeLists.txt
@@ -0,0 +1,6 @@
+add_custom_command(OUTPUT TLEPSPhysicsDict.cxx COMMAND ../../scripts/build_dict.sh TLEPSPhysics.h TLEPSPhysicsDict.cxx TLEPSPhysics.rootmap libNPLEPS.dylib DEPENDS TLEPSPhysics.h)
+add_custom_command(OUTPUT TLEPSDataDict.cxx COMMAND ../../scripts/build_dict.sh TLEPSData.h TLEPSDataDict.cxx TLEPSData.rootmap libNPLEPS.dylib DEPENDS TLEPSData.h)
+add_library(NPLEPS SHARED TLEPSSpectra.cxx TLEPSData.cxx TLEPSPhysics.cxx TLEPSDataDict.cxx TLEPSPhysicsDict.cxx )
+target_link_libraries(NPLEPS ${ROOT_LIBRARIES} NPCore) 
+install(FILES TLEPSData.h TLEPSPhysics.h TLEPSSpectra.h DESTINATION ${CMAKE_INCLUDE_OUTPUT_DIRECTORY})
+
diff --git a/NPLib/Detectors/LEPS/TLEPSData.cxx b/NPLib/Detectors/LEPS/TLEPSData.cxx
new file mode 100644
index 0000000000000000000000000000000000000000..011f7a9402acaf9e50667a2b99a1e13dbd95b109
--- /dev/null
+++ b/NPLib/Detectors/LEPS/TLEPSData.cxx
@@ -0,0 +1,79 @@
+/*****************************************************************************
+ * Copyright (C) 2009-2024   this file is part of the NPTool Project       *
+ *                                                                           *
+ * For the licensing terms see $NPTOOL/Licence/NPTool_Licence                *
+ * For the list of contributors see $NPTOOL/Licence/Contributors             *
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Original Author: Leo Plagnol  contact address: plagnol@ijclab.in2p3.fr                        *
+ *                                                                           *
+ * Creation Date  : March 2024                                           *
+ * Last update    :                                                          *
+ *---------------------------------------------------------------------------*
+ * Decription:                                                               *
+ *  This class hold LEPS Raw data                                    *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * Comment:                                                                  *
+ *                                                                           *   
+ *                                                                           *
+ *****************************************************************************/
+#include "TLEPSData.h"
+
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <string>
+using namespace std; 
+
+ClassImp(TLEPSData)
+
+
+//////////////////////////////////////////////////////////////////////
+TLEPSData::TLEPSData() {
+}
+
+
+
+//////////////////////////////////////////////////////////////////////
+TLEPSData::~TLEPSData() {
+}
+
+
+
+//////////////////////////////////////////////////////////////////////
+void TLEPSData::Clear() {
+  // Energy
+  fLEPS_E_DetectorNbr.clear();
+  fLEPS_Energy.clear();
+  // Time
+  fLEPS_T_DetectorNbr.clear();
+  fLEPS_Time.clear();
+}
+
+
+
+//////////////////////////////////////////////////////////////////////
+void TLEPSData::Dump() const {
+  // This method is very useful for debuging and worth the dev.
+  cout << "XXXXXXXXXXXXXXXXXXXXXXXX New Event [TLEPSData::Dump()] XXXXXXXXXXXXXXXXX" << endl;
+
+  // Energy
+  size_t mysize = fLEPS_E_DetectorNbr.size();
+  cout << "LEPS_E_Mult: " << mysize << endl;
+ 
+  for (size_t i = 0 ; i < mysize ; i++){
+    cout << "DetNbr: " << fLEPS_E_DetectorNbr[i]
+         << " Energy: " << fLEPS_Energy[i];
+  }
+  
+  // Time
+  mysize = fLEPS_T_DetectorNbr.size();
+  cout << "LEPS_T_Mult: " << mysize << endl;
+ 
+  for (size_t i = 0 ; i < mysize ; i++){
+    cout << "DetNbr: " << fLEPS_T_DetectorNbr[i]
+         << " Time: " << fLEPS_Time[i];
+  }
+}
diff --git a/NPLib/Detectors/LEPS/TLEPSData.h b/NPLib/Detectors/LEPS/TLEPSData.h
new file mode 100644
index 0000000000000000000000000000000000000000..b3a71af8e735ee55ccac348af55f36a2d5074c7d
--- /dev/null
+++ b/NPLib/Detectors/LEPS/TLEPSData.h
@@ -0,0 +1,104 @@
+#ifndef __LEPSDATA__
+#define __LEPSDATA__
+/*****************************************************************************
+ * Copyright (C) 2009-2024   this file is part of the NPTool Project       *
+ *                                                                           *
+ * For the licensing terms see $NPTOOL/Licence/NPTool_Licence                *
+ * For the list of contributors see $NPTOOL/Licence/Contributors             *
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Original Author: Leo Plagnol  contact address: plagnol@ijclab.in2p3.fr                        *
+ *                                                                           *
+ * Creation Date  : March 2024                                           *
+ * Last update    :                                                          *
+ *---------------------------------------------------------------------------*
+ * Decription:                                                               *
+ *  This class hold LEPS Raw data                                    *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * Comment:                                                                  *
+ *                                                                           *   
+ *                                                                           *
+ *****************************************************************************/
+
+// STL
+#include <vector>
+using namespace std;
+
+// ROOT
+#include "TObject.h"
+
+class TLEPSData : public TObject {
+  //////////////////////////////////////////////////////////////
+  // data members are hold into vectors in order 
+  // to allow multiplicity treatment
+  private: 
+    // Energy
+    vector<UShort_t>   fLEPS_E_DetectorNbr;
+    vector<Double_t>   fLEPS_Energy;
+
+    // Time
+    vector<UShort_t>   fLEPS_T_DetectorNbr;
+    vector<Double_t>   fLEPS_Time;
+
+
+  //////////////////////////////////////////////////////////////
+  // Constructor and destructor
+  public: 
+    TLEPSData();
+    ~TLEPSData();
+    
+
+  //////////////////////////////////////////////////////////////
+  // Inherited from TObject and overriden to avoid warnings
+  public:
+    void Clear();
+    void Clear(const Option_t*) {};
+    void Dump() const;
+
+
+  //////////////////////////////////////////////////////////////
+  // Getters and Setters
+  // Prefer inline declaration to avoid unnecessary called of 
+  // frequently used methods
+  // add //! to avoid ROOT creating dictionnary for the methods
+  public:
+    //////////////////////    SETTERS    ////////////////////////
+    // Energy
+    inline void SetEnergy(const UShort_t& DetNbr,const Double_t& Energy){
+      fLEPS_E_DetectorNbr.push_back(DetNbr);
+      fLEPS_Energy.push_back(Energy);
+    };//!
+
+    // Time
+    inline void SetTime(const UShort_t& DetNbr,const Double_t& Time)	{
+      fLEPS_T_DetectorNbr.push_back(DetNbr);     
+      fLEPS_Time.push_back(Time);
+    };//!
+
+
+    //////////////////////    GETTERS    ////////////////////////
+    // Energy
+    inline UShort_t GetMultEnergy() const
+      {return fLEPS_E_DetectorNbr.size();}
+    inline UShort_t GetE_DetectorNbr(const unsigned int &i) const 
+      {return fLEPS_E_DetectorNbr[i];}//!
+    inline Double_t Get_Energy(const unsigned int &i) const 
+      {return fLEPS_Energy[i];}//!
+
+    // Time
+    inline UShort_t GetMultTime() const
+      {return fLEPS_T_DetectorNbr.size();}
+    inline UShort_t GetT_DetectorNbr(const unsigned int &i) const 
+      {return fLEPS_T_DetectorNbr[i];}//!
+    inline Double_t Get_Time(const unsigned int &i) const 
+      {return fLEPS_Time[i];}//!
+
+
+  //////////////////////////////////////////////////////////////
+  // Required for ROOT dictionnary
+  ClassDef(TLEPSData,1)  // LEPSData structure
+};
+
+#endif
diff --git a/NPLib/Detectors/LEPS/TLEPSPhysics.cxx b/NPLib/Detectors/LEPS/TLEPSPhysics.cxx
new file mode 100644
index 0000000000000000000000000000000000000000..121b805009e24918b09885a0955e9f00d196e2b6
--- /dev/null
+++ b/NPLib/Detectors/LEPS/TLEPSPhysics.cxx
@@ -0,0 +1,344 @@
+/*****************************************************************************
+ * Copyright (C) 2009-2024   this file is part of the NPTool Project       *
+ *                                                                           *
+ * For the licensing terms see $NPTOOL/Licence/NPTool_Licence                *
+ * For the list of contributors see $NPTOOL/Licence/Contributors             *
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Original Author: Leo Plagnol  contact address: plagnol@ijclab.in2p3.fr                        *
+ *                                                                           *
+ * Creation Date  : March 2024                                           *
+ * Last update    :                                                          *
+ *---------------------------------------------------------------------------*
+ * Decription:                                                               *
+ *  This class hold LEPS Treated  data                               *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * Comment:                                                                  *
+ *                                                                           *   
+ *                                                                           *
+ *****************************************************************************/
+
+#include "TLEPSPhysics.h"
+
+//   STL
+#include <sstream>
+#include <iostream>
+#include <cmath>
+#include <stdlib.h>
+#include <limits>
+using namespace std;
+
+//   NPL
+#include "RootInput.h"
+#include "RootOutput.h"
+#include "NPDetectorFactory.h"
+#include "NPOptionManager.h"
+
+//   ROOT
+#include "TChain.h"
+
+ClassImp(TLEPSPhysics)
+
+
+///////////////////////////////////////////////////////////////////////////
+TLEPSPhysics::TLEPSPhysics()
+   : m_EventData(new TLEPSData),
+     m_PreTreatedData(new TLEPSData),
+     m_EventPhysics(this),
+     m_Spectra(0),
+     m_E_RAW_Threshold(0), // adc channels
+     m_E_Threshold(0),     // MeV
+     m_NumberOfDetectors(0) {
+}
+
+///////////////////////////////////////////////////////////////////////////
+/// A usefull method to bundle all operation to add a detector
+void TLEPSPhysics::AddDetector(TVector3 , string ){
+  // In That simple case nothing is done
+  // Typically for more complex detector one would calculate the relevant 
+  // positions (stripped silicon) or angles (gamma array)
+  m_NumberOfDetectors++;
+} 
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::AddDetector(double R, double Theta, double Phi, string shape){
+  // Compute the TVector3 corresponding
+  TVector3 Pos(R*sin(Theta)*cos(Phi),R*sin(Theta)*sin(Phi),R*cos(Theta));
+  // Call the cartesian method
+  AddDetector(Pos,shape);
+} 
+  
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::BuildSimplePhysicalEvent() {
+  BuildPhysicalEvent();
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::BuildPhysicalEvent() {
+  // apply thresholds and calibration
+  PreTreat();
+
+  // match energy and time together
+  unsigned int mysizeE = m_PreTreatedData->GetMultEnergy();
+  unsigned int mysizeT = m_PreTreatedData->GetMultTime();
+  for (UShort_t e = 0; e < mysizeE ; e++) {
+    for (UShort_t t = 0; t < mysizeT ; t++) {
+      if (m_PreTreatedData->GetE_DetectorNbr(e) == m_PreTreatedData->GetT_DetectorNbr(t)) {
+        DetectorNumber.push_back(m_PreTreatedData->GetE_DetectorNbr(e));
+        Energy.push_back(m_PreTreatedData->Get_Energy(e));
+        Time.push_back(m_PreTreatedData->Get_Time(t));
+      }
+    }
+  }
+}
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::PreTreat() {
+  // This method typically applies thresholds and calibrations
+  // Might test for disabled channels for more complex detector
+
+  // clear pre-treated object
+  ClearPreTreatedData();
+
+  // instantiate CalibrationManager
+  static CalibrationManager* Cal = CalibrationManager::getInstance();
+
+  // Energy
+  unsigned int mysize = m_EventData->GetMultEnergy();
+  for (UShort_t i = 0; i < mysize ; ++i) {
+    if (m_EventData->Get_Energy(i) > m_E_RAW_Threshold) {
+      Double_t Energy = Cal->ApplyCalibration("LEPS/ENERGY"+NPL::itoa(m_EventData->GetE_DetectorNbr(i)),m_EventData->Get_Energy(i));
+      if (Energy > m_E_Threshold) {
+        m_PreTreatedData->SetEnergy(m_EventData->GetE_DetectorNbr(i), Energy);
+      }
+    }
+  }
+
+  // Time 
+  mysize = m_EventData->GetMultTime();
+  for (UShort_t i = 0; i < mysize; ++i) {
+    Double_t Time= Cal->ApplyCalibration("LEPS/TIME"+NPL::itoa(m_EventData->GetT_DetectorNbr(i)),m_EventData->Get_Time(i));
+    m_PreTreatedData->SetTime(m_EventData->GetT_DetectorNbr(i), Time);
+  }
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::ReadAnalysisConfig() {
+  bool ReadingStatus = false;
+
+  // path to file
+  string FileName = "./configs/ConfigLEPS.dat";
+
+  // open analysis config file
+  ifstream AnalysisConfigFile;
+  AnalysisConfigFile.open(FileName.c_str());
+
+  if (!AnalysisConfigFile.is_open()) {
+    cout << " No ConfigLEPS.dat found: Default parameter loaded for Analayis " << FileName << endl;
+    return;
+  }
+  cout << " Loading user parameter for Analysis from ConfigLEPS.dat " << endl;
+
+  // Save it in a TAsciiFile
+  TAsciiFile* asciiConfig = RootOutput::getInstance()->GetAsciiFileAnalysisConfig();
+  asciiConfig->AppendLine("%%% ConfigLEPS.dat %%%");
+  asciiConfig->Append(FileName.c_str());
+  asciiConfig->AppendLine("");
+  // read analysis config file
+  string LineBuffer,DataBuffer,whatToDo;
+  while (!AnalysisConfigFile.eof()) {
+    // Pick-up next line
+    getline(AnalysisConfigFile, LineBuffer);
+
+    // search for "header"
+    string name = "ConfigLEPS";
+    if (LineBuffer.compare(0, name.length(), name) == 0) 
+      ReadingStatus = true;
+
+    // loop on tokens and data
+    while (ReadingStatus ) {
+      whatToDo="";
+      AnalysisConfigFile >> whatToDo;
+
+      // Search for comment symbol (%)
+      if (whatToDo.compare(0, 1, "%") == 0) {
+        AnalysisConfigFile.ignore(numeric_limits<streamsize>::max(), '\n' );
+      }
+
+      else if (whatToDo=="E_RAW_THRESHOLD") {
+        AnalysisConfigFile >> DataBuffer;
+        m_E_RAW_Threshold = atof(DataBuffer.c_str());
+        cout << whatToDo << " " << m_E_RAW_Threshold << endl;
+      }
+
+      else if (whatToDo=="E_THRESHOLD") {
+        AnalysisConfigFile >> DataBuffer;
+        m_E_Threshold = atof(DataBuffer.c_str());
+        cout << whatToDo << " " << m_E_Threshold << endl;
+      }
+
+      else {
+        ReadingStatus = false;
+      }
+    }
+  }
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::Clear() {
+  DetectorNumber.clear();
+  Energy.clear();
+  Time.clear();
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::ReadConfiguration(NPL::InputParser parser) {
+  vector<NPL::InputBlock*> blocks = parser.GetAllBlocksWithToken("LEPS");
+  if(NPOptionManager::getInstance()->GetVerboseLevel())
+    cout << "//// " << blocks.size() << " detectors found " << endl; 
+
+  vector<string> cart = {"POS","Shape"};
+  vector<string> sphe = {"R","Theta","Phi","Shape"};
+
+  for(unsigned int i = 0 ; i < blocks.size() ; i++){
+    if(blocks[i]->HasTokenList(cart)){
+      if(NPOptionManager::getInstance()->GetVerboseLevel())
+        cout << endl << "////  LEPS " << i+1 <<  endl;
+    
+      TVector3 Pos = blocks[i]->GetTVector3("POS","mm");
+      string Shape = blocks[i]->GetString("Shape");
+      AddDetector(Pos,Shape);
+    }
+    else if(blocks[i]->HasTokenList(sphe)){
+      if(NPOptionManager::getInstance()->GetVerboseLevel())
+        cout << endl << "////  LEPS " << i+1 <<  endl;
+      double R = blocks[i]->GetDouble("R","mm");
+      double Theta = blocks[i]->GetDouble("Theta","deg");
+      double Phi = blocks[i]->GetDouble("Phi","deg");
+      string Shape = blocks[i]->GetString("Shape");
+      AddDetector(R,Theta,Phi,Shape);
+    }
+    else{
+      cout << "ERROR: check your input file formatting " << endl;
+      exit(1);
+    }
+  }
+}
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::InitSpectra() {
+  m_Spectra = new TLEPSSpectra(m_NumberOfDetectors);
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::FillSpectra() {
+  m_Spectra -> FillRawSpectra(m_EventData);
+  m_Spectra -> FillPreTreatedSpectra(m_PreTreatedData);
+  m_Spectra -> FillPhysicsSpectra(m_EventPhysics);
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::CheckSpectra() {
+  m_Spectra->CheckSpectra();
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::ClearSpectra() {
+  // To be done
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+map< string , TH1*> TLEPSPhysics::GetSpectra() {
+  if(m_Spectra)
+    return m_Spectra->GetMapHisto();
+  else{
+    map< string , TH1*> empty;
+    return empty;
+  }
+}
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::WriteSpectra() {
+  m_Spectra->WriteSpectra();
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::AddParameterToCalibrationManager() {
+  CalibrationManager* Cal = CalibrationManager::getInstance();
+  for (int i = 0; i < m_NumberOfDetectors; ++i) {
+    Cal->AddParameter("LEPS", "D"+ NPL::itoa(i+1)+"_ENERGY","LEPS_D"+ NPL::itoa(i+1)+"_ENERGY");
+    Cal->AddParameter("LEPS", "D"+ NPL::itoa(i+1)+"_TIME","LEPS_D"+ NPL::itoa(i+1)+"_TIME");
+  }
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::InitializeRootInputRaw() {
+  TChain* inputChain = RootInput::getInstance()->GetChain();
+  inputChain->SetBranchStatus("LEPS",  true );
+  inputChain->SetBranchAddress("LEPS", &m_EventData );
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::InitializeRootInputPhysics() {
+  TChain* inputChain = RootInput::getInstance()->GetChain();
+  inputChain->SetBranchAddress("LEPS", &m_EventPhysics);
+}
+
+
+
+///////////////////////////////////////////////////////////////////////////
+void TLEPSPhysics::InitializeRootOutput() {
+  TTree* outputTree = RootOutput::getInstance()->GetTree();
+  outputTree->Branch("LEPS", "TLEPSPhysics", &m_EventPhysics);
+}
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+//            Construct Method to be pass to the DetectorFactory              //
+////////////////////////////////////////////////////////////////////////////////
+NPL::VDetector* TLEPSPhysics::Construct() {
+  return (NPL::VDetector*) new TLEPSPhysics();
+}
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+//            Registering the construct method to the factory                 //
+////////////////////////////////////////////////////////////////////////////////
+extern "C"{
+class proxy_LEPS{
+  public:
+    proxy_LEPS(){
+      NPL::DetectorFactory::getInstance()->AddToken("LEPS","LEPS");
+      NPL::DetectorFactory::getInstance()->AddDetector("LEPS",TLEPSPhysics::Construct);
+    }
+};
+
+proxy_LEPS p_LEPS;
+}
+
diff --git a/NPLib/Detectors/LEPS/TLEPSPhysics.h b/NPLib/Detectors/LEPS/TLEPSPhysics.h
new file mode 100644
index 0000000000000000000000000000000000000000..c89d69e1dfb6623098d4356d6eca31e39d0deef9
--- /dev/null
+++ b/NPLib/Detectors/LEPS/TLEPSPhysics.h
@@ -0,0 +1,180 @@
+#ifndef TLEPSPHYSICS_H
+#define TLEPSPHYSICS_H
+/*****************************************************************************
+ * Copyright (C) 2009-2024   this file is part of the NPTool Project       *
+ *                                                                           *
+ * For the licensing terms see $NPTOOL/Licence/NPTool_Licence                *
+ * For the list of contributors see $NPTOOL/Licence/Contributors             *
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Original Author: Leo Plagnol  contact address: plagnol@ijclab.in2p3.fr                        *
+ *                                                                           *
+ * Creation Date  : March 2024                                           *
+ * Last update    :                                                          *
+ *---------------------------------------------------------------------------*
+ * Decription:                                                               *
+ *  This class hold LEPS Treated data                                *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * Comment:                                                                  *
+ *                                                                           *   
+ *                                                                           *
+ *****************************************************************************/
+
+// C++ headers 
+#include <vector>
+#include <map>
+#include <string>
+using namespace std;
+
+// ROOT headers
+#include "TObject.h"
+#include "TH1.h"
+#include "TVector3.h"
+// NPTool headers
+#include "TLEPSData.h"
+#include "TLEPSSpectra.h"
+#include "NPCalibrationManager.h"
+#include "NPVDetector.h"
+#include "NPInputParser.h"
+// forward declaration
+class TLEPSSpectra;
+
+
+
+class TLEPSPhysics : public TObject, public NPL::VDetector {
+  //////////////////////////////////////////////////////////////
+  // constructor and destructor
+  public:
+    TLEPSPhysics();
+    ~TLEPSPhysics() {};
+
+
+  //////////////////////////////////////////////////////////////
+  // Inherited from TObject and overriden to avoid warnings
+  public: 
+    void Clear();   
+    void Clear(const Option_t*) {};
+
+
+  //////////////////////////////////////////////////////////////
+  // data obtained after BuildPhysicalEvent() and stored in
+  // output ROOT file
+  public:
+    vector<int>      DetectorNumber;
+    vector<double>   Energy;
+    vector<double>   Time;
+
+  /// A usefull method to bundle all operation to add a detector
+  void AddDetector(TVector3 POS, string shape); 
+  void AddDetector(double R, double Theta, double Phi, string shape); 
+  
+  //////////////////////////////////////////////////////////////
+  // methods inherited from the VDetector ABC class
+  public:
+    // read stream from ConfigFile to pick-up detector parameters
+    void ReadConfiguration(NPL::InputParser);
+
+    // add parameters to the CalibrationManger
+    void AddParameterToCalibrationManager();
+
+    // method called event by event, aiming at extracting the 
+    // physical information from detector
+    void BuildPhysicalEvent();
+
+    // same as BuildPhysicalEvent() method but with a simpler
+    // treatment
+    void BuildSimplePhysicalEvent();
+
+    // same as above but for online analysis
+    void BuildOnlinePhysicalEvent()  {BuildPhysicalEvent();};
+
+    // activate raw data object and branches from input TChain
+    // in this method mother branches (Detector) AND daughter leaves 
+    // (fDetector_parameter) have to be activated
+    void InitializeRootInputRaw();
+
+    // activate physics data object and branches from input TChain
+    // in this method mother branches (Detector) AND daughter leaves 
+    // (fDetector_parameter) have to be activated
+    void InitializeRootInputPhysics();
+
+    // create branches of output ROOT file
+    void InitializeRootOutput();
+
+    // clear the raw and physical data objects event by event
+    void ClearEventPhysics() {Clear();}      
+    void ClearEventData()    {m_EventData->Clear();}   
+
+    // methods related to the TLEPSSpectra class
+    // instantiate the TLEPSSpectra class and 
+    // declare list of histograms
+    void InitSpectra();
+
+    // fill the spectra
+    void FillSpectra();
+
+    // used for Online mainly, sanity check for histograms and 
+    // change their color if issues are found, for example
+    void CheckSpectra();
+
+    // used for Online only, clear all the spectra
+    void ClearSpectra();
+
+    // write spectra to ROOT output file
+    void WriteSpectra();
+
+
+  //////////////////////////////////////////////////////////////
+  // specific methods to LEPS array
+  public:
+    // remove bad channels, calibrate the data and apply thresholds
+    void PreTreat();
+
+    // clear the pre-treated object
+    void ClearPreTreatedData()   {m_PreTreatedData->Clear();}
+
+    // read the user configuration file. If no file is found, load standard one
+    void ReadAnalysisConfig();
+
+    // give and external TLEPSData object to TLEPSPhysics. 
+    // needed for online analysis for example
+    void SetRawDataPointer(TLEPSData* rawDataPointer) {m_EventData = rawDataPointer;}
+    
+  // objects are not written in the TTree
+  private:
+    TLEPSData*         m_EventData;        //!
+    TLEPSData*         m_PreTreatedData;   //!
+    TLEPSPhysics*      m_EventPhysics;     //!
+
+  // getters for raw and pre-treated data object
+  public:
+    TLEPSData* GetRawData()        const {return m_EventData;}
+    TLEPSData* GetPreTreatedData() const {return m_PreTreatedData;}
+
+  // parameters used in the analysis
+  private:
+    // thresholds
+    double m_E_RAW_Threshold; //!
+    double m_E_Threshold;     //!
+
+  // number of detectors
+  private:
+    int m_NumberOfDetectors;  //!
+
+  // spectra class
+  private:
+    TLEPSSpectra* m_Spectra; // !
+
+  // spectra getter
+  public:
+    map<string, TH1*>   GetSpectra(); 
+
+  // Static constructor to be passed to the Detector Factory
+  public:
+    static NPL::VDetector* Construct();
+
+    ClassDef(TLEPSPhysics,1)  // LEPSPhysics structure
+};
+#endif
diff --git a/NPLib/Detectors/LEPS/TLEPSSpectra.cxx b/NPLib/Detectors/LEPS/TLEPSSpectra.cxx
new file mode 100644
index 0000000000000000000000000000000000000000..41f96a17227db580ce22b44fb1e949a41d481170
--- /dev/null
+++ b/NPLib/Detectors/LEPS/TLEPSSpectra.cxx
@@ -0,0 +1,174 @@
+/*****************************************************************************
+ * Copyright (C) 2009-2024   this file is part of the NPTool Project       *
+ *                                                                           *
+ * For the licensing terms see $NPTOOL/Licence/NPTool_Licence                *
+ * For the list of contributors see $NPTOOL/Licence/Contributors             *
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Original Author: Leo Plagnol  contact address: plagnol@ijclab.in2p3.fr                        *
+ *                                                                           *
+ * Creation Date  : March 2024                                           *
+ * Last update    :                                                          *
+ *---------------------------------------------------------------------------*
+ * Decription:                                                               *
+ *  This class hold LEPS Spectra                                     *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * Comment:                                                                  *
+ *                                                                           *   
+ *                                                                           *
+ *****************************************************************************/
+
+// class header 
+#include "TLEPSSpectra.h"
+
+// STL
+#include <iostream>  
+#include <string>
+using namespace std;
+
+// NPTool header
+#include "NPOptionManager.h"
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+TLEPSSpectra::TLEPSSpectra() 
+   : fNumberOfDetectors(0) {
+  SetName("LEPS");
+}
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+TLEPSSpectra::TLEPSSpectra(unsigned int NumberOfDetectors) {
+  if(NPOptionManager::getInstance()->GetVerboseLevel()>0)
+    cout << "************************************************" << endl
+      << "TLEPSSpectra : Initalizing control spectra for " 
+      << NumberOfDetectors << " Detectors" << endl
+      << "************************************************" << endl ;
+  SetName("LEPS");
+  fNumberOfDetectors = NumberOfDetectors;
+
+  InitRawSpectra();
+  InitPreTreatedSpectra();
+  InitPhysicsSpectra();
+}
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+TLEPSSpectra::~TLEPSSpectra() {
+}
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+void TLEPSSpectra::InitRawSpectra() {
+  static string name;
+  for (unsigned int i = 0; i < fNumberOfDetectors; i++) { // loop on number of detectors
+    // Energy 
+    name = "LEPS"+NPL::itoa(i+1)+"_ENERGY_RAW";
+    AddHisto1D(name, name, 4096, 0, 16384, "LEPS/RAW");
+    // Time 
+    name = "LEPS"+NPL::itoa(i+1)+"_TIME_RAW";
+    AddHisto1D(name, name, 4096, 0, 16384, "LEPS/RAW");
+  } // end loop on number of detectors
+}
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+void TLEPSSpectra::InitPreTreatedSpectra() {
+  static string name;
+  for (unsigned int i = 0; i < fNumberOfDetectors; i++) { // loop on number of detectors
+    // Energy 
+    name = "LEPS"+NPL::itoa(i+1)+"_ENERGY_CAL";
+    AddHisto1D(name, name, 500, 0, 25, "LEPS/CAL");
+    // Time
+    name = "LEPS"+NPL::itoa(i+1)+"_TIME_CAL";
+    AddHisto1D(name, name, 500, 0, 25, "LEPS/CAL");
+
+  
+  }  // end loop on number of detectors
+}
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+void TLEPSSpectra::InitPhysicsSpectra() {
+  static string name;
+  // Kinematic Plot 
+  name = "LEPS_ENERGY_TIME";
+  AddHisto2D(name, name, 500, 0, 500, 500, 0, 50, "LEPS/PHY");
+}
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+void TLEPSSpectra::FillRawSpectra(TLEPSData* RawData) {
+  static string name;
+  static string family;
+
+  // Energy 
+  unsigned int sizeE = RawData->GetMultEnergy();
+  for (unsigned int i = 0; i < sizeE; i++) {
+    name = "LEPS"+NPL::itoa(RawData->GetE_DetectorNbr(i))+"_ENERGY_RAW";
+    family = "LEPS/RAW";
+
+    FillSpectra(family,name,RawData->Get_Energy(i));
+  }
+
+  // Time
+  unsigned int sizeT = RawData->GetMultTime();
+  for (unsigned int i = 0; i < sizeT; i++) {
+    name = "LEPS"+NPL::itoa(RawData->GetT_DetectorNbr(i))+"_TIME_RAW";
+    family = "LEPS/RAW";
+
+    FillSpectra(family,name,RawData->Get_Time(i));
+  }
+}
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+void TLEPSSpectra::FillPreTreatedSpectra(TLEPSData* PreTreatedData) {
+  static string name;
+  static string family;
+  
+  // Energy 
+  unsigned int sizeE = PreTreatedData->GetMultEnergy();
+  for (unsigned int i = 0; i < sizeE; i++) {
+    name = "LEPS"+NPL::itoa(PreTreatedData->GetE_DetectorNbr(i))+"_ENERGY_CAL";
+    family = "LEPS/CAL";
+
+    FillSpectra(family,name,PreTreatedData->Get_Energy(i));
+  }
+
+  // Time
+  unsigned int sizeT = PreTreatedData->GetMultTime();
+  for (unsigned int i = 0; i < sizeT; i++) {
+    name = "LEPS"+NPL::itoa(PreTreatedData->GetT_DetectorNbr(i))+"_TIME_CAL";
+    family = "LEPS/CAL";
+
+    FillSpectra(family,name,PreTreatedData->Get_Time(i));
+  }
+}
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+void TLEPSSpectra::FillPhysicsSpectra(TLEPSPhysics* Physics) {
+  static string name;
+  static string family;
+  family= "LEPS/PHY";
+
+  // Energy vs time
+  unsigned int sizeE = Physics->Energy.size();
+  for(unsigned int i = 0 ; i < sizeE ; i++){
+    name = "LEPS_ENERGY_TIME";
+    FillSpectra(family,name,Physics->Energy[i],Physics->Time[i]);
+  }
+}
+
diff --git a/NPLib/Detectors/LEPS/TLEPSSpectra.h b/NPLib/Detectors/LEPS/TLEPSSpectra.h
new file mode 100644
index 0000000000000000000000000000000000000000..363940c6cb94dbd75f583cc3e1aab344cfdf5c56
--- /dev/null
+++ b/NPLib/Detectors/LEPS/TLEPSSpectra.h
@@ -0,0 +1,62 @@
+#ifndef TLEPSSPECTRA_H
+#define TLEPSSPECTRA_H
+/*****************************************************************************
+ * Copyright (C) 2009-2024   this file is part of the NPTool Project       *
+ *                                                                           *
+ * For the licensing terms see $NPTOOL/Licence/NPTool_Licence                *
+ * For the list of contributors see $NPTOOL/Licence/Contributors             *
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Original Author: Leo Plagnol  contact address: plagnol@ijclab.in2p3.fr                        *
+ *                                                                           *
+ * Creation Date  : March 2024                                           *
+ * Last update    :                                                          *
+ *---------------------------------------------------------------------------*
+ * Decription:                                                               *
+ *  This class hold LEPS Spectra                                     *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * Comment:                                                                  *
+ *                                                                           *   
+ *                                                                           *
+ *****************************************************************************/
+
+// NPLib headers
+#include "NPVSpectra.h"
+#include "TLEPSData.h"
+#include "TLEPSPhysics.h"
+
+// Forward Declaration
+class TLEPSPhysics;
+
+
+class TLEPSSpectra : public VSpectra {
+  //////////////////////////////////////////////////////////////
+  // constructor and destructor
+  public:
+    TLEPSSpectra();
+    TLEPSSpectra(unsigned int NumberOfDetectors);
+    ~TLEPSSpectra();
+
+  //////////////////////////////////////////////////////////////
+  // Initialization methods
+  private:
+    void InitRawSpectra();
+    void InitPreTreatedSpectra();
+    void InitPhysicsSpectra();
+
+  //////////////////////////////////////////////////////////////
+  // Filling methods
+  public:
+    void FillRawSpectra(TLEPSData*);
+    void FillPreTreatedSpectra(TLEPSData*);
+    void FillPhysicsSpectra(TLEPSPhysics*);
+
+  //////////////////////////////////////////////////////////////
+  // Detector parameters 
+  private:
+    unsigned int fNumberOfDetectors;
+};
+
+#endif