Extracting constraints on kinetic mixing between a new U(1)′ gauge boson hiding under the Standard Model Z boson resonance requires the formalism of non-Hermitian two-point correlation functions at 1-loop order. We derive self-consistent collider constraints on Z′ bosons with kinetic mixing in a narrow mass window around the Z boson, considering both model-independent and model-dependent bounds. Our treatment elucidates the importance of both avoided level crossing and width suppression due to the quantum Zeno effect in interpreting the existing constraints. We also discuss the implications for future measurements on the Z-pole.
Bio:
Felix Yu is a permanent staff scientist at the Johannes Gutenberg University of Mainz in the Theoretical High Energy Physics group. His main research interests are collider phenomenology of the Standard Model and beyond, Higgs physics, and dark sector physics. He also works on supersymmetric field theories, flavor physics phenomenology, and neutrino model building. Current projects include field theory studies of non-perturbative weakly coupled phenomena, phase transitions, and very-weakly coupled particles.
Before coming to Mainz, from August 2011 to September 2014, Felix was a Research Associate at Fermi National Accelerator Laboratory in the Theoretical Physics Department. He then worked as a five-year postdoc in the Mainz high energy theory group before his current position on the JGU Mainz faculty. Felix received his Ph.D. in Physics in June 2011 from the University of California, Irvine, under the supervision of Arvind Rajaraman, and he was a graduate student in the UCI High Energy Physics Theory group from 2007-2011. He graduated with a B.A. in Physics and Mathematics from Harvard University in 2006. He was a 2010 LHC Theory Initiative Graduate Fellow, and he was a 2010-2011 UCI Chancellor's Club Fund for Excellence Fellow.
https://yutheorygroup.uni-mainz.de/
Prof. Jia Liu