2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56010We introduce a new invariant for foliations using the even pairing between K-homology and cyclic homology and discuss some possible applications in physics.45 pages, extended version. to appear in Commun. Math. Phys., communicated with A. ConnesHigh Energy Physics - Theorytext