Description
Chair: Joseph Tudor
In the context of a possible Higgs pole run at FCC-ee, I discuss the theoretical `price' of a large electron Yukawa modification. I start from an effective field theory viewpoint, considering the impact of renormalisation group effects on related observables and also examining assumptions on the broader UV flavour structure. I will then give an overview of the landscape of simplified models,...
We consider a new class of flavour models where the spurion breaking the flavour symmetries of the Standard Model is in a non-minimal irrep. Via multiple insertions of this spurion, flavour hierarchies accidentally arise from initial $\mathcal{O}(1)$ untuned entries. By relying on non-Abelian symmetries, the resulting pattern of flavour-violating operators at dim-6 SMEFT can be distinct from...
I will present a very brief overview of a nearly complete study of the vector and tensor decay constants of $B^*$, $B_s^*$, $D^*$, and $D_s^*$ mesons from fully relativistic $n_f = 2+1+1$ lattice QCD. We use multiple lattice spacings, with both heavy and physical light-quark masses. Ours will be not only the first lattice results for the $B^*$ and $B_s^*$ tensor decay constants, but also the...
Constraining the Higgs self-coupling at collider experiments allows us to better understand the shape and properties of the Higgs potential, which is a promising avenue into New Physics beyond the Standard Model (SM). The current experimental uncertainties on the Higgs self-coupling, parametrised by $\kappa_\lambda$, are of $\mathcal{O}(100\%)$, while Higgs couplings to the weak gauge bosons,...
Higher-derivative QFT’s are famously non-unitary, they suffer with growing modes and negative-norm states reflecting the classical Ostrogradsky instability. In this talk, I will present an interacting model whose renormalisation group flow admits a special line of solutions. On this special line we find preliminary evidence that the theory may be perturbatively unitary.
Cosmic superstrings are an interesting possible phenomenon in the early universe. Recently, there has been increased interest in the behaviour of these superstrings under a rolling modulus background which will cause the tension of the cosmic string to vary. We explore some preliminary results in the behaviour of cosmic string loops and perturbations in cosmic string networks under various...
I will discuss holographic spacelike and timelike entanglement entropy using the Ryu-Takayanagi prescription, for different-shaped entangling regions. I work with an infinite family of 10-dimensional Type IIB supergravity solutions, which are gravity duals to an infinite set of linear quiver theories which are 4-dimensional confining theories at low energy, but decompactify and flow to...
The AGT correspondence has lead to a rich interaction between 4d N=2 supersymmetric gauge theories and 2d non-rational conformal field theories. With Lotte Hollands, we hope to add another entry into this dictionary. Spectral networks are primarily objects that track the various BPS spectra of the 4d theory. In this talk, I will briefly discuss how spectral networks can be used to construct...
