Thursday, December 04, 2025, 16:00
WHGA/001
Armine Rostomyan, DESY Hamburg
Abstract:
The τ lepton plays an important role in the search for physics beyond the Standard Model. Its large mass and rich decay structure make it uniquely sensitive to new interactions, whether they appear as subtle deviations in precision observables or as direct signatures of new particles. Consequently, τ physics offers two powerful and complementary pathways to uncovering new phenomena: high-precision measurements that test the internal consistency of the Standard Model, and direct searches that aim to reveal new physics at the intensity frontier.
In this talk, I will discuss both approaches, with particular emphasis on topics that have been actively pursued at DESY, including recent high-precision measurements of the τ-lepton mass and tests of lepton-flavour universality, and I will also outline the prospects for new-physics searches in the τ sector.