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We study the propagator of a colored scalar particle in the background of anon-abelian gauge field using the worldline formalism. It is obtained byconsidering the open worldline of a scalar particle with extra degrees offreedom needed to take into account the color charge of the particle, which wechoose to be in the fundamental representation of the gauge group. Specializingthe external gauge field to be given by a sum of plane waves, i.e. a sum ofexternal gluons, we produce a master formula for the scalar propagator with anarbitrary number of gluons directly attached to the scalar line, akin tosimilar formulas derived in the literature for the case of the scalar particleperforming a loop. Our worldline description produces at the same time thesituation in which the particle has a color charge given by an arbitrarilychosen symmetric or antisymmetric tensor product of the fundamental.

Dressed scalar propagator in a non-abelian background from the worldline formalism