Journal Club

Seminar Room

Tuesday 17th of May, 2022

Hour: 10:00

Title: Beta-decay implications for the W-boson mass anomaly

Presented by: Kuldeep Deka

Ref: https://arxiv.org/abs/2204.08440v1

Abstract:

We point out the necessity to consider $\beta$-decay observables in resolutions of the $W$-boson anomaly in the Standard Model Effective Field Theory that go beyond pure oblique corrections. We demonstrate that present global analyses that explain the $W$-boson mass anomaly predict a large, percent-level, violation of first-row CKM unitarity. We investigate what solutions to the $W$-boson mass anomaly survive after including $\beta$-decay constraints.

Hour: 10:00

Title: Towards the renormalisation of the Standard Model effective field theory to dimension eight: Bosonic interactions II

Presented by: 123

Ref: https://arxiv.org/abs/2205.03301v1

Abstract:

We calculate the renormalisation group running of the bosonic Standard Model (SM) effective operators at one loop and to order v4/Λ4, with v∼246 GeV being the electroweak scale and Λ the unknown new physics threshold. We focus on contributions driven by one dimension-eight term and SM couplings, thus extending (and completing) the effort initiated in arXiv:2106.05291, in which quantum corrections from pairs of dimension-six interactions were considered. We highlight some interesting consequences, including the renormalisation of loop-induced interactions by tree-level generated terms and, more importantly, the validity of positivity bounds on different operators inducing anomalous gauge quartic couplings.