  We revisit the computation of the trace anomaly for Weyl fermions using
dimensional regularization. For a consistent treatment of the chiral gamma
matrix $\gamma_*$ in dimensional regularization, we work in $n$ dimensions from
the very beginning and use the Breitenlohner-Maison scheme to define
$\gamma_*$. We show that the parity-odd contribution to the trace anomaly
vanishes (for which the use of dimension-dependent identities is crucial), and
that the parity-even contribution is half the one of a Dirac fermion. To arrive
at this result, we compute the full renormalized expectation value of the
fermion stress tensor to second order in perturbations around Minkowski
spacetime, and also show that it is conserved.
