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In the Majorana equation for particles with arbitrary spin, wave packetsoccur due to not only the uncertainty that affects position and momentum butalso due to infinite components with decreasing mass that form the Majoranaspinor. In this paper, we prove that such components contribute to increase thespreading of wave packets. Moreover, Zitterbewegung takes place in both thetime propagation of Dirac wave packets and in Majorana wave packets. However,it shows a peculiar fine structure. Finally, group velocity always remainssubluminal and contributions due to infinite components decrease progressivelyas spin increases.

Wave Packet Dynamics in the Majorana Equation