  The experimental verification of chiral anomaly in Weyl semimetals is an
active area of investigation in modern condensed matter physics, which
typically relies on the combined signatures of longitudinal magnetoconductance
(LMC) along with the planar Hall effect (PHE). It has recently been shown that
for weak non-quantizing magnetic fields, a sufficiently strong finite
intervalley scattering drives the system to switch the sign of LMC from
positive to negative. Here we unravel another independent source that produces
the same effect. Specifically, a smooth lattice cutoff to the linear
dispersion, which is ubiquitous in real Weyl materials, introduces nonlinearity
in the problem and also drives the system to exhibit negative LMC for
non-collinear electric and magnetic fields even in the limit of vanishing
intervalley scattering. We examine longitudinal magnetoconductivity and the
planar Hall effect semi-analytically for a lattice model of tilted Weyl
fermions within the Boltzmann approximation. We independently study the effects
of a finite lattice cutoff and tilt parameters and construct phase diagrams in
relevant parameter spaces that are relevant for diagnosing chiral anomaly in
real Weyl materials.
