new class : parametrization of the cluster-size for RPC chambers
[u/mrichter/AliRoot.git] / MUON / AliMUONResponseTriggerV1.cxx
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e087fe7f 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/*
17
18*/
19
20#include "AliMUONResponseTriggerV1.h"
21#include "AliSegmentation.h"
22#include <TMath.h>
23#include <TRandom.h>
24#include <iostream.h>
25
26ClassImp(AliMUONResponseTriggerV1)
27
28//------------------------------------------------------------------
29AliMUONResponseTriggerV1::AliMUONResponseTriggerV1(){
30// default constructor
31 Float_t hv=9.2;
32 SetParameters(hv);
33}
34
35//------------------------------------------------------------------
36AliMUONResponseTriggerV1::AliMUONResponseTriggerV1(Float_t hv){
37// Constructor
38 SetParameters(hv);
39}
40
41//------------------------------------------------------------------
42void AliMUONResponseTriggerV1::SetParameters(Float_t hv){
43// initialize parameters accoring to HV
44// (see V.Barret B.Espagnon and P.Rosnet Alice/note xxx)
45 fA = 6.089 * hv - 52.70;
46 fB = 2.966;
47 fC = 4.3e-4 * hv - 3.5e-3;
48}
49
50//------------------------------------------------------------------
51Int_t AliMUONResponseTriggerV1::SetGenerCluster(){
52// Set the GenerCluster parameter and return 1
53 fGenerCluster = gRandom->Rndm();
54 return 1;
55}
56
57//------------------------------------------------------------------
58Float_t AliMUONResponseTriggerV1::IntXY(AliSegmentation * segmentation){
59// Returns 1 or 0 if the current strip is fired or not
60// get the "parameters" needed to evaluate the strip response
61// x1 : hit x(y) position
62// x2 : x(y) coordinate of the main strip
63// x3 : current strip real x(y) coordinate
64// x4 : dist. between x(y) hit pos. and the closest border of the current strip
65
66 Float_t x1,x2,x3,x4;
67 segmentation->IntegrationLimits(x1,x2,x3,x4);
68 Float_t theta = 0.; // incident angle to be implemented
69
70 return (fGenerCluster < FireStripProb(x4,theta)) ? 1:0;
71}
72
73//------------------------------------------------------------------
74Float_t AliMUONResponseTriggerV1::FireStripProb(Float_t x4, Float_t theta){
75// parametrisation of the probability that a strip neighbour of the main
76// strip is fired (V.Barret B.Espagnon and P.Rosnet Alice/note xxx)
77// WARNING : need to convert x4 from cm to mm
78
79 return
80 (TMath::Cos(theta)*fA/(fA+TMath::Cos(theta)*TMath::Power(x4*10.,fB))+fC)/
81 (TMath::Cos(theta)+fC);
82}
83