protected:

Int_t FindLimitsFromTable(Double_t mu) Double_t Prob(Int_t N, Double_t mu, Double_t B)public:

TFeldmanCousins TFeldmanCousins(Double_t newCL = 0.9, TString options) TFeldmanCousins TFeldmanCousins(const TFeldmanCousins&) virtual void ~TFeldmanCousins() Double_t CalculateLowerLimit(Double_t Nobserved, Double_t Nbackground) Double_t CalculateUpperLimit(Double_t Nobserved, Double_t Nbackground) static TClass* Class() Double_t GetCL() Double_t GetLowerLimit() Double_t GetMuMax() Double_t GetMuMin() Double_t GetMuStep() Double_t GetNbackground() Double_t GetNMax() Double_t GetNobserved() Double_t GetUpperLimit() virtual TClass* IsA() const void SetCL(Double_t newCL) void SetMuMax(Double_t newMax = 50.0) void SetMuMin(Double_t newMin = 0.0) void SetMuStep(Double_t newMuStep = 0.005) void SetNbackground(Double_t Nbg) void SetNobserved(Double_t NObs) virtual void ShowMembers(TMemberInspector& insp, char* parent) virtual void Streamer(TBuffer& b) void StreamerNVirtual(TBuffer& b)

protected:

Double_t fCLconfidence level as a fraction [e.g. 90% = 0.9]Double_t fUpperLimitthe calculated upper limitDouble_t fLowerLimitthe calculated lower limitDouble_t fNobservedinput number of observed eventsDouble_t fNbackgroundinput number of background eventsDouble_t fMuMinminimum value of signal to use in calculating the tablesDouble_t fMuMaxmaximum value of signal to use in calculating the tablesDouble_t fMuStepthe step in signal to use when generating tablesInt_t fNMuStep= (int)(fMuStep)Int_t fNMax= (int)(fMuMax)Int_t fQUICKtake a short cut to speed up the process of generating a

TFeldmanCousins class to calculate the CL upper limit using the Feldman-Cousins method as described in PRD V57 #7, p3873-3889 The default confidence interval calvculated using this method is 90% This is set either by having a default the constructor, or using the appropriate fraction when instantiating an object of this class (e.g. 0.9) The simple extension to a gaussian resolution function bounded at zero has not been addressed as yet -> `time is of the essence' as they write on the wall of the maze in that classic game ... VARIABLES THAT CAN BE ALTERED ----------------------------- => depending on your desired precision: The intial values of fMuMin, fMuMax, fMuStep and fNMax are those used in the PRD: fMuMin = 0.0 fMuMax = 50.0 fMuStep= 0.005 but there is total flexibility in changing this should you desire. see example of use in $ROOTSYS/tutorials/FeldmanCousins.C Author: Adrian Bevan, Liverpool University Copyright Liverpool University 2001 bevan@slac.stanford.edu

TFeldmanCousins(Double_t newFC, TString options)

~TFeldmanCousins()

Double_t CalculateLowerLimit(Double_t Nobserved, Double_t Nbackground)

given Nobserved and Nbackground, try different values of mu that give lower limits that are consistent with Nobserved. The closed interval (plus any stragglers) corresponds to the F&C interval

Double_t CalculateUpperLimit(Double_t Nobserved, Double_t Nbackground)

given Nobserved and Nbackground, try different values of mu that give upper limits that are consistent with Nobserved. The closed interval (plus any stragglers) corresponds to the F&C interval

Int_t FindLimitsFromTable( Double_t mu )

calculate the probability table for a given mu for n = 0, NMAX and return 1 if the number of observed events is consistent with the CL bad

Double_t Prob(Int_t N, Double_t mu, Double_t B)

calculate the poissonian probability for a mean of mu+B events with a variance of N

void SetMuMax(Double_t newMax)

void SetMuStep(Double_t newMuStep)

Double_t GetUpperLimit() Double_t GetLowerLimit() Double_t GetNobserved() Double_t GetNbackground() Double_t GetCL() Double_t GetMuMin() Double_t GetMuMax() Double_t GetMuStep() Double_t GetNMax() void SetNobserved(Double_t NObs) void SetNbackground(Double_t Nbg) void SetCL(Double_t newCL) void SetMuMin(Double_t newMin = 0.0) TClass* Class() TClass* IsA() const void ShowMembers(TMemberInspector& insp, char* parent) void Streamer(TBuffer& b) void StreamerNVirtual(TBuffer& b) TFeldmanCousins TFeldmanCousins(const TFeldmanCousins&)

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