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add pre-cut KL beam beta histogram #1122

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add pre-cut KL beam beta histogram #1122

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ca616d8
add pre-cut KL beam beta histogram
Apr 20, 2026
805ba23
PID: DBeamKLong pre-cut beta hist in Init with ROOT lock for multithread
Apr 20, 2026
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33 changes: 32 additions & 1 deletion src/libraries/PID/DBeamKLong_factory.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,11 @@ using namespace std;

#include "DBeamKLong_factory.h"

#include <JANA/Services/JLockService.h>

#include "HDGEOMETRY/DGeometry.h"
#include "DANA/DEvent.h"
#include "TDirectory.h"

#include "DVertex.h"
#include "particleType.h"
Expand All @@ -27,6 +30,25 @@ void DBeamKLong_factory::Init(void)
auto app = GetApplication();
app->SetDefaultParameter("BEAM:ENABLE_KLONG_BEAM_RECON", dEnableKLongBeamRecon);

auto root_lock = app->GetService<JLockService>();
root_lock->RootWriteLock();
{
TDirectory* locSavedDir = gDirectory;
gDirectory->cd("/");
TDirectory* locIndependentDir = gDirectory->GetDirectory("Independent");
if(locIndependentDir == nullptr)
locIndependentDir = gDirectory->mkdir("Independent");
locIndependentDir->cd();
TDirectory* locDiagDir = gDirectory->GetDirectory("BeamKLongFactory");
if(locDiagDir == nullptr)
locDiagDir = gDirectory->mkdir("BeamKLongFactory");
locDiagDir->cd();

if(dHistBeamBetaFactoryPreCut == nullptr)
dHistBeamBetaFactoryPreCut = new TH1I("BeamBeta_PreCut_DBeamKLongFactory", "DBeamKLong factory #beta (pre-cut from DVertex:KLong z,t);#beta;events", 800, -0.1, 1.5);
locSavedDir->cd();
}
root_lock->RootUnLock();
}

//------------------
Expand Down Expand Up @@ -64,6 +86,15 @@ void DBeamKLong_factory::Process(const std::shared_ptr<const JEvent>& event)
double KL_distance = ( locVertex->dSpacetimeVertex.Z() - dTargetCenterZ ) + ( 24. * 100. );
double KL_propagation_time = locVertex->dSpacetimeVertex.T() + (24.*100. - dTargetCenterZ) / c; // t=0 is at z=0
double beta = (KL_distance / KL_propagation_time) / c;

if(std::isfinite(beta) && (dHistBeamBetaFactoryPreCut != nullptr))
{
DEvent::GetLockService(event)->RootWriteLock();
{
dHistBeamBetaFactoryPreCut->Fill(beta);
}
DEvent::GetLockService(event)->RootUnLock();
}

// cout << locVertex->dSpacetimeVertex.Z() << " " << dTargetCenterZ
// << KL_distance << " " << KL_propagation_time << " " << beta << endl;
Expand All @@ -74,7 +105,7 @@ void DBeamKLong_factory::Process(const std::shared_ptr<const JEvent>& event)
// should make some cut based on the beam period... but for now, cut out events that are obviously too slow
if(locVertex->dSpacetimeVertex.T() > 250.)
return;

// cout << "in DBeamKLong_factory::evnt() ..." << endl;
// cout << KL_distance << " " << locVertex->dSpacetimeVertex.Z() << " " << dTargetCenterZ << endl;
// cout << KL_propagation_time << " " << beta << endl;
Expand Down
2 changes: 2 additions & 0 deletions src/libraries/PID/DBeamKLong_factory.h
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
#include <PID/DBeamKLong.h>
#include <DANA/DApplication.h>
#include "DResourcePool.h"
#include "TH1I.h"

class DBeamKLong_factory : public JFactoryT<DBeamKLong>
{
Expand Down Expand Up @@ -40,6 +41,7 @@ class DBeamKLong_factory : public JFactoryT<DBeamKLong>

bool dEnableKLongBeamRecon;
double dTargetCenterZ;
TH1I* dHistBeamBetaFactoryPreCut = nullptr;


//RESOURCE POOL
Expand Down