How Does the Dalitz Plot Represent Particle Decay into Equal Mass Particles?

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SUMMARY

The discussion focuses on the representation of the Dalitz plot for the decay of particle A into three equal mass particles, demonstrating that the plot forms an equilateral triangle with a height of Q/2, inscribed within a larger triangle of height Q. The equation Q = MassA - 3(MassB) is pivotal in deriving these relationships. The analysis emphasizes that the Dalitz plot only resembles a triangle under specific conditions, such as when particle A decays into massless particles or when particle A is significantly heavier than particle B, allowing for the approximation E~p for decay particles.

PREREQUISITES
  • Understanding of relativistic kinematics
  • Familiarity with the concept of the Dalitz plot
  • Knowledge of particle decay processes
  • Proficiency in using energy-momentum conservation equations
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  • Study the derivation of the Dalitz plot for different decay scenarios
  • Learn about the implications of massless particles in particle physics
  • Explore energy-momentum conservation in particle decays
  • Investigate the role of kinetic energy in relativistic particle interactions
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Particle physicists, students studying particle decay, and researchers analyzing decay kinematics will benefit from this discussion.

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Homework Statement



Decay of particle A into three particles of equal mass, prove that the Dalitz plot is a equilateral triangle with height Q/2, inscribed within a triangle with height Q.

Homework Equations



Q = MassA - 3(MassB)

The Attempt at a Solution



For relativistic kinematics, T (kinetic energy) is = E = p (in natural units)

I'm not sure where to go from here. Thanks,
 
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The Dalitz plot is not a triangle unless A decays into massless particles, or A is so much heavier than B that Bhas E>>M. Then as you write E~p for each decay particle. Also then, Q=M_A.
The maximum energy of any decay particle is when the other two are in the opposite direction with equal energy. This should get you the maximum energy of any decay particle, which you can relate to the altitude of the triangle.
 

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