X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=STEER%2FAliESDcascade.cxx;h=0d59c0a39722346d4af7df0b2c3831bcd2b3a0c4;hb=620008aa63de283ad7b71327c5e00df808fe78b3;hp=9ffc4d39a897c8a77274614efd48a88af92d1cf5;hpb=4f679a16a64b5c8b947fa1c7045d2501df30d642;p=u%2Fmrichter%2FAliRoot.git diff --git a/STEER/AliESDcascade.cxx b/STEER/AliESDcascade.cxx index 9ffc4d39a89..0d59c0a3972 100644 --- a/STEER/AliESDcascade.cxx +++ b/STEER/AliESDcascade.cxx @@ -23,34 +23,133 @@ // Origin: Christian Kuhn, IReS, Strasbourg, christian.kuhn@ires.in2p3.fr //------------------------------------------------------------------------- +#include #include +#include "AliLog.h" +#include "AliExternalTrackParam.h" +#include "AliESDv0.h" #include "AliESDcascade.h" ClassImp(AliESDcascade) -AliESDcascade::AliESDcascade() : TObject() { +AliESDcascade::AliESDcascade() : + AliESDv0(), + fPdgCode(kXiMinus), + fEffMass(TDatabasePDG::Instance()->GetParticle(kXiMinus)->Mass()), + fChi2Xi(1.e+33), + fDcaXiDaughters(999), + fBachIdx(-1) +{ //-------------------------------------------------------------------- // Default constructor (Xi-) //-------------------------------------------------------------------- - fPdgCode=kXiMinus; - fEffMass=1.32131; - fChi2=1.e+33; - fPos[0]=fPos[1]=fPos[2]=0.; - fPosCov[0]=fPosCov[1]=fPosCov[2]=fPosCov[3]=fPosCov[4]=fPosCov[5]=0.; + for (Int_t j=0; j<3; j++) { + fPosXi[j]=0.; + fBachMom[j]=0.; + } + + fPosCovXi[0]=1e10; + fPosCovXi[1]=fPosCovXi[2]=0.; + fPosCovXi[3]=1e10; + fPosCovXi[4]=0.; + fPosCovXi[5]=1e10; + + fBachMomCov[0]=1e10; + fBachMomCov[1]=fBachMomCov[2]=0.; + fBachMomCov[3]=1e10; + fBachMomCov[4]=0.; + fBachMomCov[5]=1e10; +} + +AliESDcascade::~AliESDcascade() { } -inline Double_t det(Double_t a00, Double_t a01, Double_t a10, Double_t a11){ - // determinant 2x2 - return a00*a11 - a01*a10; +AliESDcascade::AliESDcascade(const AliESDv0 &v, + const AliExternalTrackParam &t, Int_t i) : + AliESDv0(v), + fPdgCode(kXiMinus), + fEffMass(-1), + fChi2Xi(1.e+33), + fDcaXiDaughters(-1), + fBachIdx(i) +{ + //--------------------------------------------------------------------------------------------- + // Main constructor (Xi-) + //--------------------------------------------------------------------------------------------- + + Double_t r[3]; t.GetXYZ(r); + Double_t x1=r[0], y1=r[1], z1=r[2]; // position of the bachelor + Double_t p[3]; t.GetPxPyPz(p); + Double_t px1=p[0], py1=p[1], pz1=p[2];// momentum of the bachelor track + + Double_t x2,y2,z2; // position of the V0 + v.GetXYZ(x2,y2,z2); + Double_t px2,py2,pz2; // momentum of V0 + v.GetPxPyPz(px2,py2,pz2); + + Double_t a2=((x1-x2)*px2+(y1-y2)*py2+(z1-z2)*pz2)/(px2*px2+py2*py2+pz2*pz2); + + Double_t xm=x2+a2*px2; + Double_t ym=y2+a2*py2; + Double_t zm=z2+a2*pz2; + + //dca between V0 and bachelor + + fDcaXiDaughters = TMath::Sqrt((x1-xm)*(x1-xm) + (y1-ym)*(y1-ym) + (z1-zm)*(z1-zm)); + + // position of the cascade decay + + fPosXi[0]=0.5*(x1+xm); fPosXi[1]=0.5*(y1+ym); fPosXi[2]=0.5*(z1+zm); + + + // invariant mass of the cascade (default is Ximinus) + + Double_t e1=TMath::Sqrt(0.13957*0.13957 + px1*px1 + py1*py1 + pz1*pz1); + Double_t e2=TMath::Sqrt(1.11568*1.11568 + px2*px2 + py2*py2 + pz2*pz2); + + fEffMass=TMath::Sqrt((e1+e2)*(e1+e2)- + (px1+px2)*(px1+px2)-(py1+py2)*(py1+py2)-(pz1+pz2)*(pz1+pz2)); + + + // momenta of the bachelor and the V0 + + fBachMom[0]=px1; fBachMom[1]=py1; fBachMom[2]=pz1; + + //PH Covariance matrices: to be calculated correctly in the future + fPosCovXi[0]=1e10; + fPosCovXi[1]=fPosCovXi[2]=0.; + fPosCovXi[3]=1e10; + fPosCovXi[4]=0.; + fPosCovXi[5]=1e10; + + fBachMomCov[0]=1e10; + fBachMomCov[1]=fBachMomCov[2]=0.; + fBachMomCov[3]=1e10; + fBachMomCov[4]=0.; + fBachMomCov[5]=1e10; + + fChi2Xi=7.; + } -inline Double_t det (Double_t a00,Double_t a01,Double_t a02, - Double_t a10,Double_t a11,Double_t a12, - Double_t a20,Double_t a21,Double_t a22) { - // determinant 3x3 - return - a00*det(a11,a12,a21,a22)-a01*det(a10,a12,a20,a22)+a02*det(a10,a11,a20,a21); +AliESDcascade::AliESDcascade(const AliESDcascade& cas) : + AliESDv0(cas), + fPdgCode(cas.fPdgCode), + fEffMass(cas.fEffMass), + fChi2Xi(cas.fChi2Xi), + fDcaXiDaughters(cas.fDcaXiDaughters), + fBachIdx(cas.fBachIdx) +{ + //copy constructor + for (int i=0; i<3; i++) { + fPosXi[i] = cas.fPosXi[i]; + fBachMom[i] = cas.fBachMom[i]; + } + for (int i=0; i<6; i++) { + fPosCovXi[i] = cas.fPosCovXi[i]; + fBachMomCov[i] = cas.fBachMomCov[i]; + } } Double_t AliESDcascade::ChangeMassHypothesis(Double_t &v0q, Int_t code) { @@ -81,14 +180,13 @@ Double_t AliESDcascade::ChangeMassHypothesis(Double_t &v0q, Int_t code) { bmass=0.49368; mass=1.67245; ps=0.211; break; default: - Info("AliCascadeVertex::ChangeMassHypothesis", - "Invalide PDG code ! Assuming XiMinus's..."); + AliError("Invalide PDG code ! Assuming XiMinus's..."); fPdgCode=kXiMinus; break; } - Double_t pxn=fV0mom[0][0], pyn=fV0mom[0][1], pzn=fV0mom[0][2]; - Double_t pxp=fV0mom[1][0], pyp=fV0mom[1][1], pzp=fV0mom[1][2]; + Double_t pxn=fNmom[0], pyn=fNmom[1], pzn=fNmom[2]; + Double_t pxp=fPmom[0], pyp=fPmom[1], pzp=fPmom[2]; Double_t px0=pxn+pxp, py0=pyn+pyp, pz0=pzn+pzp; Double_t p0=TMath::Sqrt(px0*px0 + py0*py0 + pz0*pz0); @@ -131,29 +229,29 @@ AliESDcascade::GetPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const { //-------------------------------------------------------------------- // This function returns the cascade momentum (global) //-------------------------------------------------------------------- - px=fV0mom[0][0]+fV0mom[1][0]+fBachMom[0]; - py=fV0mom[0][1]+fV0mom[1][1]+fBachMom[1]; - pz=fV0mom[0][2]+fV0mom[1][2]+fBachMom[2]; + px=fNmom[0]+fPmom[0]+fBachMom[0]; + py=fNmom[1]+fPmom[1]+fBachMom[1]; + pz=fNmom[2]+fPmom[2]+fBachMom[2]; } -void AliESDcascade::GetXYZ(Double_t &x, Double_t &y, Double_t &z) const { +void AliESDcascade::GetXYZcascade(Double_t &x, Double_t &y, Double_t &z) const { //-------------------------------------------------------------------- // This function returns cascade position (global) //-------------------------------------------------------------------- - x=fPos[0]; - y=fPos[1]; - z=fPos[2]; + x=fPosXi[0]; + y=fPosXi[1]; + z=fPosXi[2]; } -Double_t AliESDcascade::GetD(Double_t x0, Double_t y0, Double_t z0) const { +Double_t AliESDcascade::GetDcascade(Double_t x0, Double_t y0, Double_t z0) const { //-------------------------------------------------------------------- // This function returns the cascade impact parameter //-------------------------------------------------------------------- - Double_t x=fPos[0],y=fPos[1],z=fPos[2]; - Double_t px=fV0mom[0][0]+fV0mom[1][0]+fBachMom[0]; - Double_t py=fV0mom[0][1]+fV0mom[1][1]+fBachMom[1]; - Double_t pz=fV0mom[0][2]+fV0mom[1][2]+fBachMom[2]; + Double_t x=fPosXi[0],y=fPosXi[1],z=fPosXi[2]; + Double_t px=fNmom[0]+fPmom[0]+fBachMom[0]; + Double_t py=fNmom[1]+fPmom[1]+fBachMom[1]; + Double_t pz=fNmom[2]+fPmom[2]+fBachMom[2]; Double_t dx=(y0-y)*pz - (z0-z)*py; Double_t dy=(x0-x)*pz - (z0-z)*px; @@ -163,3 +261,29 @@ Double_t AliESDcascade::GetD(Double_t x0, Double_t y0, Double_t z0) const { return d; } +Double_t AliESDcascade::GetCascadeCosineOfPointingAngle(Double_t& refPointX, Double_t& refPointY, Double_t& refPointZ) const { + // calculates the pointing angle of the cascade wrt a reference point + + Double_t momCas[3]; //momentum of the cascade + GetPxPyPz(momCas[0],momCas[1],momCas[2]); + + Double_t deltaPos[3]; //vector between the reference point and the cascade vertex + deltaPos[0] = fPosXi[0] - refPointX; + deltaPos[1] = fPosXi[1] - refPointY; + deltaPos[2] = fPosXi[2] - refPointZ; + + Double_t momCas2 = momCas[0]*momCas[0] + momCas[1]*momCas[1] + momCas[2]*momCas[2]; + Double_t deltaPos2 = deltaPos[0]*deltaPos[0] + deltaPos[1]*deltaPos[1] + deltaPos[2]*deltaPos[2]; + + Double_t cosinePointingAngle = (deltaPos[0]*momCas[0] + + deltaPos[1]*momCas[1] + + deltaPos[2]*momCas[2] ) / + TMath::Sqrt(momCas2 * deltaPos2); + + return cosinePointingAngle; +} + +void AliESDcascade::GetPosCovXi(Double_t cov[6]) const { + + for (Int_t i=0; i<6; ++i) cov[i] = fPosCovXi[i]; +}