TauNeutrino


1   package JSci.physics.particles;
2   
3   import JSci.physics.quantum.QuantumParticle;
4   
5   /**
6   * A class representing tau neutrinos.
7   * @version 1.5
8   * @author Mark Hale
9   */
10  public final class TauNeutrino extends Lepton {
11          /**
12          * Constructs a tau neutrino.
13          */
14          public TauNeutrino() {}
15          /**
16          * Returns the rest mass (MeV).
17          * @return 0.0
18          */
19          public double restMass() {return 0.0;}
20          /**
21          * Returns the electric charge.
22          * @return 0
23          */
24          public int charge() {return 0;}
25          /**
26          * Returns the electron lepton number.
27          * @return 0
28          */
29          public int eLeptonQN() {return 0;}
30          /**
31          * Returns the muon lepton number.
32          * @return 0
33          */
34          public int muLeptonQN() {return 0;}
35          /**
36          * Returns the tau lepton number.
37          * @return 1
38          */
39          public int tauLeptonQN() {return 1;}
40          /**
41          * Returns the antiparticle of this particle.
42          */
43          public QuantumParticle anti() {
44                  return new AntiTauNeutrino();
45          }
46          /**
47          * Returns true if qp is the antiparticle.
48          */
49          public boolean isAnti(QuantumParticle qp) {
50                  return (qp!=null) && (qp instanceof AntiTauNeutrino);
51          }
52          /**
53          * Returns a string representing this class.
54          */
55          public String   toString() {
56                  return new String  ("Tau neutrino");
57          }
58          /**
59          * Emits a W+.
60          */
61          public Tau emit(WPlus w) {
62                  Tau e=new Tau();
63                  e.momentum=momentum.subtract(w.momentum);
64                  return e;
65          }
66          /**
67          * Absorbs a W-.
68          */
69          public Tau absorb(WMinus w) {
70                  Tau e=new Tau();
71                  e.momentum=momentum.add(w.momentum);
72                  return e;
73          }
74          /**
75          * Emits a Z0.
76          */
77          public TauNeutrino emit(ZZero z) {
78                  momentum=momentum.subtract(z.momentum);
79                  return this;
80          }
81          /**
82          * Absorbs a Z0.
83          */
84          public TauNeutrino absorb(ZZero z) {
85                  momentum=momentum.add(z.momentum);
86                  return this;
87          }
88  }
89  
90
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