Removing TT hits from long tracks can be a good check to see effects which are caused by the TT. TO BE FINISHED WHEN IT WORKED AS I THOUGHT

Add the following two source files f.ex. to Tr/TrackTools. TrackRemoveSTIDs.cpp

// Gaudi
#include "GaudiKernel/AlgFactory.h"
#include <boost/foreach.hpp>
// track interfaces
#include "Kernel/ISTChannelIDSelector.h"
#include "Event/Track.h"
#include "Kernel/LHCbID.h"
#include "TrackRemoveSTIDs.h"
 
using namespace LHCb;
 
DECLARE_ALGORITHM_FACTORY( TrackRemoveSTIDs );
 
TrackRemoveSTIDs::TrackRemoveSTIDs(const std::string& name,
                       ISvcLocator* pSvcLocator):
  GaudiAlgorithm(name, pSvcLocator)
{
  // constructor
 this->declareProperty("selectorType", m_selectorType = "STSelectChannelIDByElement");
 this->declareProperty("inputLocation", m_inputLocation = TrackLocation::Default);
}
 
TrackRemoveSTIDs::~TrackRemoveSTIDs()
{
  // destructor
}
 
StatusCode TrackRemoveSTIDs::initialize()
{
  StatusCode sc = GaudiAlgorithm::initialize();
  if (sc.isFailure()){
     return Error("Failed to initialize");
  }
  // da selector
  m_selector = tool<ISTChannelIDSelector>(m_selectorType, "RemovalSelector");
  return StatusCode::SUCCESS;
}
 
StatusCode TrackRemoveSTIDs::execute(){
  Tracks* trackCont = get<Tracks>(m_inputLocation);
  // loop and remove the hits
  for (Tracks::const_iterator iterT = trackCont->begin(); iterT != trackCont->end(); ++iterT){
    if ((*iterT)->type() == Track::Long) removeHits(*iterT);
  } // iterT
  return StatusCode::SUCCESS;
};
 
void TrackRemoveSTIDs::removeHits(Track* aTrack) const{
  // get the list of ones to remove....
  std::vector<LHCb::LHCbID> tmpCont;
  const std::vector<LHCb::LHCbID>& ids = aTrack->lhcbIDs();
  BOOST_FOREACH(LHCb::LHCbID id, ids) { 
    if (m_selector->select(id.stID()) == true) tmpCont.push_back(id);
  }
  BOOST_FOREACH(LHCb::LHCbID dead, tmpCont){ 
    aTrack->removeFromLhcbIDs(dead);
  }
}

and TrackRemoveSTIDs.h

// $Id:  $
#ifndef _TrackRemoveSTIDs_H_
#define _TrackRemoveSTIDs_H_
/** @class TrackRemoveSTIDs TrackRemoveSTIDs.h
 *
 *  Clean out tracks with some criteria from the container
 *
 *  @author M.Needham
 *  @date   30/05/2006
 */
#include "GaudiAlg/GaudiAlgorithm.h"
#include <string>
#include <vector>
class ISTChannelIDSelector;
namespace LHCb{
  class Track;
}
class TrackRemoveSTIDs: public GaudiAlgorithm {
public:
  // Constructors and destructor
  TrackRemoveSTIDs(const std::string& name,
              ISvcLocator* pSvcLocator);
  virtual ~TrackRemoveSTIDs();
  virtual StatusCode initialize();
  virtual StatusCode execute();
 
private:
  std::string m_inputLocation;
  ISTChannelIDSelector* m_selector;
  std::string m_selectorType;
  void removeHits(LHCb::Track* aTrack) const; 
};
#endif

In your options file, do something like:

from Configurables import  TrackRemoveSTIDs
hitRemover = TrackRemoveSTIDs('hitRemover')
selector = STSelectChannelIDByElement("ToolSvc.RemovalSelector")
selector.elementNames = ["TTa", "TTb"]
selector.DetType = "TT"
GaudiSequencer("myMC09SelJpsi2MuMuFilterSequence").Members += [myveloClusters,
RawBankToSTClusterAlg("CreateTTClusters"),
createITClusters, createITLiteClusters, hitRemover]