Speaker
Mr
Johan Löfgren
(Uppsala University)
Description
A neutral and massive vector boson, often called Z', is a common feature of many
beyond standard model scenarios. The simplest such models extend the electroweak
sector of the SM with an extra U(1)-group, spontaneously broken at some higher scale.
In such extensions it is important to ensure that this classical symmetry is not
violated by quantum effects - so called anomalies. In a theory with chiral fermions,
explicit anomaly cancellation requires relations between the different U(1)-charges
of these fermions. It is also possible to cancel the anomalies through a
Green-Schwarz mechanism, an effect of integrating out 'heavy physics' (can be
attributed to string theory or simply to heavy chiral fermions).
In this talk I will discuss Z' phenomenology of minimal U(1)-theories at the LHC,
with focus on the constraints imposed by anomaly cancellation. I will discuss
similarities and differences between explicit anomaly cancellation and the
Green-Schwarz mechanism. This talk is in part based on arXiv:1605.04855, in part on a
forthcoming paper.
Primary author
Mr
Johan Löfgren
(Uppsala University)
Co-authors
Mr
Andreas Ekstedt
(Uppsala University)
Prof.
Gunnar Ingelman
(Uppsala University)
Dr
Rikard Enberg
(Uppsala University)
Dr
Tanumoy Mandal
(Uppsala University, University of Delhi)
