JSci.physics.particles.Tau Maven / Gradle / Ivy
package JSci.physics.particles;
import JSci.physics.quantum.QuantumParticle;
/**
* A class representing taus.
* @version 1.5
* @author Mark Hale
*/
public final class Tau extends Lepton {
/**
* Constructs a tau.
*/
public Tau() {}
/**
* Returns the rest mass (MeV).
* @return 1777.03
*/
public double restMass() {return 1777.03;}
/**
* Returns the electric charge.
* @return -1
*/
public int charge() {return -1;}
/**
* Returns the electron lepton number.
* @return 0
*/
public int eLeptonQN() {return 0;}
/**
* Returns the muon lepton number.
* @return 0
*/
public int muLeptonQN() {return 0;}
/**
* Returns the tau lepton number.
* @return 1
*/
public int tauLeptonQN() {return 1;}
/**
* Returns the antiparticle of this particle.
*/
public QuantumParticle anti() {
return new AntiTau();
}
/**
* Returns true if qp is the antiparticle.
*/
public boolean isAnti(QuantumParticle qp) {
return (qp!=null) && (qp instanceof AntiTau);
}
/**
* Returns a string representing this class.
*/
public String toString() {
return new String("Tau");
}
/**
* Emits a photon.
*/
public Tau emit(Photon y) {
momentum=momentum.subtract(y.momentum);
return this;
}
/**
* Absorbs a photon.
*/
public Tau absorb(Photon y) {
momentum=momentum.add(y.momentum);
return this;
}
/**
* Emits a W-.
*/
public TauNeutrino emit(WMinus w) {
TauNeutrino n=new TauNeutrino();
n.momentum=momentum.subtract(w.momentum);
return n;
}
/**
* Absorbs a W+.
*/
public TauNeutrino absorb(WPlus w) {
TauNeutrino n=new TauNeutrino();
n.momentum=momentum.add(w.momentum);
return n;
}
/**
* Emits a Z0.
*/
public Tau emit(ZZero z) {
momentum=momentum.subtract(z.momentum);
return this;
}
/**
* Absorbs a Z0.
*/
public Tau absorb(ZZero z) {
momentum=momentum.add(z.momentum);
return this;
}
}