A track from a cosmic-ray shower has momentum and speed .

PHYSICS · Multi-part · Fermi University Physics · Particle Physics & Quantum Fields · Particles, interactions and experiment · Particles, interactions and experiment

Particle Physics, Ch The particle zoo and the four interactions

Problem

A track from a cosmic-ray shower has momentum

2000\,\mathrm{MeV}/c

and speed

\beta = 0.905

. ((a)) Calculate the mass of the particle in

\mathrm{MeV}/c^2

and identify it, given

\pi^+ = 139.57

K^+ = 493.68

, proton

= 938.3\,\mathrm{MeV}/c^2

. ((b)) This particle is built from

u

and

d

quarks only. State which generation these quarks belong to. ((c)) State the spin

J

and the electric charge, in units of

e

, tabulated for this particle.

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