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StBeamBackMaker Class Reference

Beam background tracker in the TPC. More...

#include <StBeamBackMaker.h>

Inheritance diagram for StBeamBackMaker:
StMaker TDataSet

Public Member Functions

 StBeamBackMaker (const char *name="StBeamBackMaker")
 Constructor. More...
 
Int_t Make ()
 Run the tracker on the current event.
 
- Public Member Functions inherited from StMaker
 StMaker (const char *name="", const char *dummy=0)
 Constructor & Destructor.
 
virtual Int_t IsChain () const
 
virtual void Clear (Option_t *option="")
 User defined functions.
 
virtual Int_t InitRun (Int_t runumber)
 
virtual Int_t Init ()
 
virtual void StartMaker ()
 
virtual Int_t IMake (Int_t number)
 
virtual void EndMaker (Int_t ierr)
 
virtual Int_t Finish ()
 
virtual Int_t FinishRun (Int_t oldrunumber)
 
virtual void FatalErr (Int_t Ierr, const char *Com)
 
virtual void PrintInfo ()
 
virtual void NotifyMe (const char *, const void *)
 
virtual void AddMaker (StMaker *mk)
 
virtual void MakeDoc (const TString &, const TString &, Bool_t)
 
virtual void AddData (TDataSet *data, const char *dir=".data")
 User methods.
 
virtual TDataSet * AddObj (TObject *obj, const char *dir, int owner=1)
 
virtual TDataSet * ToWhiteBoard (const char *name, void *dat)
 
virtual TDataSet * ToWhiteBoard (const char *name, void *dat, void *del)
 
virtual TDataSet * ToWhiteBoard (const char *name, TObject *dat, Int_t owner)
 
virtual TDataSet * ToWhiteConst (const char *name, TObject *dat)
 
virtual TDataSet * ToWhiteConst (const char *name, void *dat)
 
virtual TDataSet * WhiteBoard (const char *name, void *v=0) const
 
virtual Int_t Skip (Int_t nskip)
 
virtual void AddConst (TDataSet *data=0)
 
virtual void AddHist (TH1 *h, const char *dir=0)
 
virtual void AddGarb (TDataSet *data=0)
 
virtual void AddRunco (TDataSet *data=0)
 
virtual void AddRunco (Double_t par, const char *name, const char *comment)
 
void AddRunCont (TDataSet *data=0)
 
virtual TList * GetHistList () const
 
virtual TH1 * GetHist (const char *histName) const
 
virtual StMaker * cd ()
 
virtual StMaker * Cd ()
 
virtual Int_t GetNumber () const
 STAR methods.
 
virtual void SetNumber (Int_t number)
 
virtual StMaker * GetParentChain () const
 
virtual Int_t GetIventNumber () const
 Returns the current event number.
 
virtual void SetIventNumber (Int_t iv)
 
virtual Int_t GetEventNumber () const
 
virtual Int_t GetRunNumber () const
 Returns the current RunNumber.
 
virtual const TDatime & GetDateTime () const
 
virtual const TDatime & GetDBTime () const
 
virtual void SetDateTime (Int_t idat, Int_t itim)
 
virtual StEvtHddr * GetEvtHddr () const
 
virtual Int_t GetDate () const
 
virtual Int_t GetTime () const
 
virtual const char * GetEventType () const
 
virtual TDataSet * GetData (const char *name, const char *dir=".data") const
 
virtual TDataSet * GetData () const
 
virtual TDataSet * GetConst () const
 
virtual TDataSet * GetDataSet (const char *logInput) const
 
virtual TDataSet * DataSet (const char *logInput) const
 
virtual TDataSet * GetInputDS (const char *logInput) const
 
virtual TDataSet * GetDataBase (const char *logInput, const TDatime *td=0)
 
virtual TDataSet * GetInputDB (const char *logInput)
 
virtual Int_t GetDebug () const
 
virtual Int_t Debug () const
 
virtual Int_t GetMakeReturn () const
 
virtual TList * Histograms () const
 
virtual TString GetAlias (const char *log, const char *dir=".aliases") const
 
virtual TString GetInput (const char *log) const
 
virtual TString GetOutput (const char *log) const
 
virtual TList * GetMakeList () const
 
virtual StMaker * GetParentMaker () const
 
virtual StMaker * GetMaker (const char *mkname)
 
virtual StMaker * GetMakerInheritsFrom (const char *mktype) const
 
virtual Bool_t IsActive ()
 
virtual StMaker * Maker (const char *mkname)
 
virtual void SetBIT (EMakerStatus k)
 Maker Status Bits.
 
virtual void ResetBIT (EMakerStatus k)
 
virtual Bool_t TestBIT (EMakerStatus k)
 
virtual void SetActive (Bool_t k=kTRUE)
 Setters for flags and switches.
 
virtual void SetDebug (Int_t l=1)
 
virtual void SetDEBUG (Int_t l=1)
 
virtual void SetFlavor (const char *flav, const char *tabname)
 
virtual void SetMakeReturn (Int_t ret)
 
virtual void SetAlias (const char *log, const char *act, const char *dir=".aliases")
 
virtual void AddAlias (const char *log, const char *act, const char *dir=".aliases")
 
virtual void SetInput (const char *log, const char *act)
 
virtual void SetOutput (const char *log, const char *act)
 
virtual void SetOutput (const char *log, TDataSet *ds)
 
virtual void SetOutput (TDataSet *ds)
 
virtual void SetOutputAll (TDataSet *ds, Int_t level=1)
 
virtual void SetMode (Int_t mode=0)
 
virtual void SetNotify (const char *about, StMaker *mk)
 
virtual Int_t GetMode ()
 
virtual Int_t GetDebug ()
 
virtual const StChainOpt * GetChainOpt () const
 
virtual TFile * GetTFile () const
 
virtual void NotifyEm (const char *about, const void *ptr)
 
virtual Double_t RealTime ()
 
virtual Double_t CpuTime ()
 
virtual void StartTimer (Bool_t reset=kFALSE)
 
virtual void StopTimer ()
 
virtual void PrintTimer (Option_t *option="")
 
virtual void PrintTotalTime ()
 
virtual const char * GetName () const
 special overload
 
TObject * GetDirObj (const char *dir) const
 
void SetDirObj (TObject *obj, const char *dir)
 
virtual const char * GetCVS () const
 
Int_t SetAttr (const char *key, const char *val, const char *to=".")
 
Int_t SetAttr (const char *key, Int_t val, const char *to=".")
 
Int_t SetAttr (const char *key, UInt_t val, const char *to=".")
 
Int_t SetAttr (const char *key, Double_t val, const char *to=".")
 
Int_t SetAttr (const StMaker *mk)
 
Int_t RemAttr (const char *key, const char *to=".")
 
const TAttr * GetAttr () const
 
Int_t IAttr (const char *key) const
 
UInt_t UAttr (const char *key) const
 
Double_t DAttr (const char *key) const
 
const char * SAttr (const char *key) const
 
void PrintAttr () const
 
- Public Member Functions inherited from TDataSet
 TDataSet (const char *name="", TDataSet *parent=0, Bool_t arrayFlag=kFALSE)
 
 TDataSet (const TDataSet &src, EDataSetPass iopt=kAll)
 
 TDataSet (TNode &src)
 This copy ctor has been depricated (left for thwe sake of the backweard compatibility)
 
virtual ~TDataSet ()
 std::cout << "Default destructor for " << GetName() << " - " << GetTitle() << std::endl;
 
virtual void Add (TDataSet *dataset)
 
virtual void AddAt (TDataSet *dataset, Int_t idx=0)
 
virtual void AddAtAndExpand (TDataSet *dataset, Int_t idx=0)
 
virtual void AddFirst (TDataSet *dataset)
 Add TDataSet object at the beginning of the dataset list of this dataset.
 
virtual void AddLast (TDataSet *dataset)
 Add TDataSet object at the end of the dataset list of this dataset.
 
TDataSet * At (Int_t idx) const
 
virtual void Browse (TBrowser *b)
 Browse this dataset (called by TBrowser).
 
virtual TObject * Clone (const char *newname="") const
 the custom implementation fo the TObject::Clone
 
virtual void Delete (Option_t *opt="")
 
virtual TDataSet * Find (const char *path) const
 
virtual TDataSet * FindByName (const char *name, const char *path="", Option_t *opt="") const
 
virtual TDataSet * FindByPath (const char *path) const
 Aliase for TDataSet::Find(const Char_t *path) method.
 
virtual TDataSet * FindByTitle (const char *title, const char *path="", Option_t *opt="") const
 
TObject * FindObject (const char *name) const
 
TObject * FindObject (const TObject *o) const
 
virtual TDataSet * First () const
 Return the first object in the list. Returns 0 when list is empty.
 
TObjArray * GetObjArray () const
 
virtual TSeqCollection * GetCollection () const
 
TList * GetList () const
 
virtual Int_t GetListSize () const
 
TObject * GetMother () const
 
virtual TObject * GetObject () const
 The depricated method (left here for the sake of the backward compatibility)
 
virtual TDataSet * GetParent () const
 
virtual Long_t HasData () const
 
virtual TDataSet * Instance () const
 
virtual TString Path () const
 return the full path of this data set
 
virtual EDataSetPass Pass (EDataSetPass(*callback)(TDataSet *), Int_t depth=0)
 
virtual EDataSetPass Pass (EDataSetPass(*callback)(TDataSet *, void *), void *user, Int_t depth=0)
 
virtual void PrintContents (Option_t *opt="") const
 
virtual Int_t Purge (Option_t *opt="")
 
virtual void Remove (TDataSet *set)
 Remiove the "set" from this TDataSet.
 
virtual TDataSet * RemoveAt (Int_t idx)
 
virtual void SetMother (TDataSet *parent=0)
 
virtual void SetObject (TObject *obj)
 The depricated method (left here for the sake of the backward compatibility)
 
virtual void SetParent (TDataSet *parent=0)
 
virtual void SetWrite ()
 
virtual void Shunt (TDataSet *newParent=0)
 
virtual void Sort ()
 Sort recursively all members of the TDataSet with TList::Sort method.
 
virtual Bool_t IsEmpty () const
 return kTRUE if the "internal" collection has no member
 
virtual Bool_t IsFolder () const
 
virtual Bool_t IsMarked () const
 
virtual Bool_t IsThisDir (const char *dirname, int len=-1, int ignorecase=0) const
 
virtual TDataSet * Last () const
 Return the last object in the list. Returns 0 when list is empty.
 
virtual void ls (Option_t *option="") const
 
virtual void ls (Int_t depth) const
 
void Mark ()
 
void UnMark ()
 
void MarkAll ()
 Mark all members of this dataset.
 
void UnMarkAll ()
 UnMark all members of this dataset.
 
void InvertAllMarks ()
 Invert mark bit for all members of this dataset.
 
void Mark (UInt_t flag, EBitOpt reset=kSet)
 
virtual TDataSet * Next () const
 
virtual TDataSet * Prev () const
 
virtual void Update ()
 
virtual void Update (TDataSet *set, UInt_t opt=0)
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
 

Additional Inherited Members

- Public Types inherited from StMaker
enum  EDebugLevel { kNormal, kDebug }
 
enum  { kSTAFCV_BAD, kSTAFCV_OK, kSTAFCV_ERR =2, kSTAFCV_FATAL =3 }
 
enum  EMakerStatus {
  kInitBeg = 1, kInitEnd = 2, kMakeBeg = 3, kCleaBeg = 4,
  kFiniBeg = 5, kFiniEnd = 6, kActive = 7
}
 
- Public Types inherited from TDataSet
enum  EDataSetPass {
  kContinue, kPrune, kStop, kUp,
  kStruct, kAll, kRefs, kMarked
}
 
enum  ESetBits { kMark = BIT(22), kArray = BIT(20) }
 
enum  EBitOpt { kSet = kTRUE, kReset = kFALSE }
 
- Static Public Member Functions inherited from StMaker
static StMaker * New (const char *classname, const char *name="", void *title=0)
 
static StMaker * GetTopChain ()
 
static StMaker * GetChain ()
 
static StMaker * GetFailedMaker ()
 
static StMaker * GetMaker (const TDataSet *ds)
 Static functions.
 
static EDataSetPass ClearDS (TDataSet *ds, void *user)
 
static const char * RetCodeAsString (Int_t kode)
 
static Int_t AliasDate (const char *alias)
 
static Int_t AliasTime (const char *alias)
 
static const char * AliasGeometry (const char *alias)
 
static const DbAlias_t * GetDbAliases ()
 
static void SetTestMaker (StTestMaker *mk)
 
static Int_t Cleanup (TDataSet *&ds)
 
static void lsMakers (const StMaker *top)
 
- Static Public Member Functions inherited from TDataSet
static TDataSet * GetMainSet ()
 return pointer to the main dataset
 
static TDataSet * instance ()
 
- Public Attributes inherited from StMaker
enum StMaker:: { ... }  EModule_return_Status
 
- Protected Member Functions inherited from StMaker
StMessMgr * GetLogger () const
 
virtual TDataSet * FindDataSet (const char *logInput, const StMaker *uppMk=0, const StMaker *dowMk=0) const
 
- Protected Member Functions inherited from TDataSet
virtual void SetMother (TObject *mother)
 
 TDataSet (const char *name, const char *title)
 
void AddMain (TDataSet *set)
 add data set to main data set
 
TDataSet * GetRealParent ()
 return real parent
 
void MakeCollection ()
 Create the internal container at once if any.
 
- Static Protected Member Functions inherited from TDataSet
static EDataSetPass SortIt (TDataSet *ds)
 
static EDataSetPass SortIt (TDataSet *ds, void *user)
 
- Protected Attributes inherited from StMaker
TDataSet * m_DataSet
 
TDataSet * m_ConstSet
 
TDataSet * m_GarbSet
 
TDataSet * m_Inputs
 
TDataSet * m_Ouputs
 list of logInput:ActualInput
 
TDataSet * m_Runco
 list of logOuput:ActualOuput
 
TList * m_Histograms
 Run Control parameters.
 
Int_t fTallyMaker [kStFatal+1]
 counters
 
Int_t m_Mode
 counters
 
Int_t m_Number
 Integer mode of maker.
 
Int_t m_LastRun
 Serial event number.
 
Int_t m_DebugLevel
 Last Run number.
 
Int_t m_MakeReturn
 Debug level.
 
TStopwatch m_Timer
 Make() return flag.
 
StMemStat * fMemStatMake
 Timer object.
 
StMemStat * fMemStatClear
 StMemStat for Make.
 
Int_t fStatus
 StMemStat for Clear.
 
StMessMgr * fLogger
 Maker status.
 
StTurnLogger * fLoggerHold
 
- Protected Attributes inherited from TDataSet
TDataSet * fParent
 
TSeqCollection * fList
 
- Static Protected Attributes inherited from StMaker
static StMaker * fgTopChain = 0
 list of Histograms
 
static StMaker * fgStChain = 0
 pointer to top StChain
 
static StMaker * fgFailedMaker = 0
 current pointer to StChain
 
static StTestMaker * fgTestMaker = 0
 current pointer to failed maker
 
static Int_t fgTallyMaker [kStFatal+1] = {0,0,0,0,0}
 
- Static Protected Attributes inherited from TDataSet
static TDataSet * fgMainSet = &mainSet
 

Detailed Description

Beam background tracker in the TPC.

The beam background tracker in the TPC is a maker that is meant to run in bfc.C (big full chain) after TPC hits have been created and stored in the TPC hit collection of the StEvent structure and after ITTF, the STAR tracking software, has run. The beam background tracker then scavenges leftover TPC Hits to look for beam background tracks parallel to the z-axis that presumably originate upstream of either the blue or yellow beam scrapping against focussing/steering magnet elements in the beamline and spraying particles that shower into the IR (intersection region). Detectors at forward rapidity, such as the Endcap EMC, are most affected by this type of beam background events and this has been confirmed by several physics analyses.

The tracker algorithm is:

  1. Collect all leftover TPC hits into a C++ multiset with their z-coordinate used as a key. This ensures the hits are sorted in ascending z-ccordinate and the insert and delete times are O(logN).
  2. Look for track seeds. Start a track seed with the hit with the smallest z-coordinate. Keep adding hits to the track seed so long as the radial distance in xy between the the centroid and the hit is less than MAX_R_DISTANCE (= 5 cm).
  3. Weed out track seeds with less than MIN_TRACK_SEED_HITS (= 100) hits.
  4. Perform linear fits in the zx and zy-planes. Save only tracks that have absolute slopes in both planes less than MAX_SLOPE (= 0.1). At the same time, add to the track available hits that are within a radial distance of 5 cm of the fitted line.
  5. Merge linear tracks if both end points of the first track are within 5 cm of the centroid of the track in the xy-plane.

  6. Refit the track and remove hits that are not within a radius of 5 cm in the xy-plane of the refitted line. Pileup tracks are discarded. A non-pileup track has at least 4 hits in each of the following TPC zones along the beamline:

    a. -200 <= z < -150 cm (far east) b. -50 <= z < 0 cm (near east) c. 0 <= z < 50 cm (near west) d. 150 <= z < 200 cm (far west)

  7. Convert all tracks to StTrack for storage into StEvent:

    a. The track key is the highest key from existing tracks in StEvent incremented by 1. b. The track flag is set to 901 (beam background track in TPC). c. The track encoded method is kLine3D. d. The track origin is the point (x-intercept, y-intercept, 0) e. The track momentum is set to (dx/dz, dy/dz, 1), then the magnitude is adjusted to 999 GeV/c. This is a simple measure to prevent unsuspecting folks from accidentally using these beam background tracks as genuine charged particles from collisions in the STAR detector in their physics analysis. f. The first point, last point, hits, number of hits is saved in StTrackDetectorInfo and StTrackFitTraits.

  8. In StEvent, trackNodes() and trackDetectorInfo() are updated.

Definition at line 96 of file StBeamBackMaker.h.

Constructor & Destructor Documentation

StBeamBackMaker::StBeamBackMaker ( const char *  name = "StBeamBackMaker")
inline

Constructor.

Parameters
Nameof the instance of StBeamBackMaker

Definition at line 102 of file StBeamBackMaker.h.

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