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The effects of Lorentz boosts on the quantum entanglement encoded by a pairof massive spin one-half particles are described according to the Lorentzcovariant structure described by Dirac bispinors. The quantum system consideredincorporates four degrees of freedom -- two of them related to the bispinorintrinsic parity and other two related to the bispinor spin projection, i.e.the Dirac particle helicity. Because of the natural multipartite structureinvolved, the Meyer-Wallach global measure of entanglement is preliminarilyused for computing global quantum correlations, while the entanglementseparately encoded by spin degrees of freedom is measured through thenegativity of the reduced two-particle spin-spin state. A general framework tocompute the changes on quantum entanglement induced by a boost is developed,and then specialized to describe three particular anti-symmetric two-particlestates. According to the obtained results, two-particle spin-spin entanglementcannot be created by the action of a Lorentz boost in a spin-spin separableanti-symmetric state. On the other hand, the maximal spin-spin entanglementencoded by anti-symmetric superpositions is degraded by Lorentz boosts drivenby high-speed frame transformations. Finally, the effects of boosts on chiralstates are shown to exhibit interesting invariance properties, which can onlybe obtained through such a Lorentz covariant formulation of the problem.

Global Dirac bispinor entanglement under Lorentz boosts