= Particle track
A <particle track> is a reconstructed trajectory inferred from spatially separated detector measurements associated with a particle. Individual hits are observations; fitting a track combines them with a propagation model, measurement errors and possible scattering.
In a uniform <magnetic field>, a charged particle follows a helical trajectory in the ideal limit. Its transverse <momentum> is $p_\perp=|q|BR$, where $R$ is the projected <curvature> radius in SI units. <Curvature> therefore constrains <momentum>, while its direction constrains the charge sign. Neutral particles generally require indirect reconstruction through secondary charged particles or other interaction signatures rather than an ordinary continuous charged-particle track.
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