  We present an operator based factorization formula for the transverse
energy-energy correlator (TEEC) hadron collider event shape in the back-to-back
(dijet) limit. This factorization formula exhibits a remarkably symmetric form,
being a projection onto a scattering plane of a more standard transverse
momentum dependent factorization. Soft radiation is incorporated through a
dijet soft function, which can be elegantly obtained to next-to-next-to-leading
order (NNLO) due to the symmetries of the problem. We present numerical results
for the TEEC resummed to next-to-next-to-leading logarithm (NNLL) matched to
fixed order at the LHC. Our results constitute the first NNLL resummation for a
dijet event shape observable at a hadron collider, and the first analytic
result for a hadron collider dijet soft function at NNLO. We anticipate that
the theoretical simplicity of the TEEC observable will make it indispensable
for precision studies of QCD at the LHC, and as a playground for theoretical
studies of factorization and its violation.
