Transverse mass

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The transverse mass is a useful thing to define for use in particle physics. In natural units it is:

m_{T}^2 = m^2 + p_{x}^2 + p_{y}^2 \,
where the z-direction is along the beam pipe and so
px and py are the momentum perpendicular to the beam pipe and
m is the mass

[edit] References

  • J.D. Jackson (2004). "Kinematics". Particle Data Group.  - See page 7 for definition of transverse mass.