  We consider the scattering of Dirac particles in graphene due to the
superposition of an external magnetic field and mechanical strain. As a model
for a graphene nanobubble, we find exact analytical solutions for
single-particle states inside and outside a circular region submitted to the
fields. Finally, we obtain analytical expressions for the scattering
cross-section, as well as for the Landauer current through the circular region.
Our results provide a fully-analytical treatment for electronic transport
through a graphene nanobubble, showing that a combination of a physical
magnetic field and strain leads to valley polarization and filtering of the
electronic current. Moreover, our analytical model provides an explicit
metrology principle to measure strain by performing conductance experiments
under a controlled magnetic field imposed over the sample.
