1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
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12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
17 //-------------------------------------------------------------------------
18 // Helper -DATA class ESD V0 vertex class
19 // contains effective errror parameterization
20 // Effective parameterization of resolution in DCA and PA as function of radii and momenta
21 // Mini-max coeficient fPMinFraction... fPMaxFraction...
22 // as limits for Error parameterization using Covariance matrix
23 // For detailes : see AliESDv0 class
25 // Origin: Marian Ivanov marian.ivanov@cern.ch
26 //-------------------------------------------------------------------------
29 #include "AliESDV0Params.h"
32 ClassImp(AliESDV0Params)
35 AliESDV0Params::AliESDV0Params() :
37 // These constants are used in the error parameterization using covariance matrix
38 // minimal sigma in AP and DCA
39 fPSigmaOffsetD0(0.03), // minimal sigma of error estimate
40 fPSigmaOffsetAP0(0.005),
42 // Effective parameterization of DCA resolution as function of pt and decay radii
45 fPSigmaOffsetDE(0.06),
50 // Effective parameterization of PA resolution as function of pt and decay radii
52 fPSigmaBase0APE(0.005),
56 fPSigmaP0APE(0.7*0.4),
57 fPSigmaP1APE(0.3*0.4),
62 fPMinFractionAP0(0.5),
63 fPMaxFractionAP0(1.5),
72 // Default constructor
73 // Consult AliESDv0 to see actual error parameterization