3 papers
hep-ph2026
How to Identify a Majoron: Effective Field Theories of Spontaneous Lepton Number Breaking
Carla Biggio, Marta Fuentes Zamoro, Xu Li +2
We revisit the traditional Type I, II and III Seesaw mechanisms in the presence of a complex scalar field charged under a global symmetry that can be identified with lepton…
hep-ph2025
Isolating chirality-breaking SMEFT operators with Drell-Yan angular analysis
Samuele Grossi, Xu Li, Lorenzo Rolla +1
We present a comprehensive strategy to isolate the effect of a class of chirality-breaking interactions in the Standard Model Effective Field Theory (SMEFT) by exploiting Drell-Yan…
hep-ph2025
Lam-Tung relation breaking effects and weak dipole moments at lepton colliders
Guanghui Li, Xu Li, Bin Yan
The breaking of the Lam-Tung relation in the Drell-Yan process at the LHC exhibits a long-standing tension with the Standard Model (SM) prediction at accuracy.…