Discussion on the physics of Four Tops

Friday 19 Feb 2021, 15:00 → 19:15 Europe/Zurich

Online only (CERN)

Fabio Maltoni (Université Catholique de Louvain and Università di Bologna), Ennio Salvioni (CERN), Javi Serra (Technical University of Munich)

With the large amount of data gathered by the Run 2 of the LHC, the production of four top quarks has become a very interesting probe of the Standard Model and beyond. What is more, the measurements of this process in multilepton + (b-)jets final states have found an intriguing enhancement with respect to state-of-the-art SM predictions, usually attributed to its ttW background. In this event we invite you to discuss the physics of four tops, both within and beyond the SM. The meeting will consist of a few invited presentations, each followed by ample time for scientific exchange.

1 Experimental status of four-top searches in ATLAS

Speaker: Simon Berlendis (University of Arizona)

210219-SSML-TopLhcWg.pdf

2 Experimental status of four-top searches in CMS

Speaker: Emanuele Usai (Brown University)

four_tops_cms.pdf

3 Standard Model predictions for tttt

In this presentation the NLO predictions for the production of 4 top quarks will be discussed and what this implies for the extraction of the top Yukawa coupling from this process. Based on https://arxiv.org/abs/1711.02116.

Speaker: Rikkert Frederix (Lund University)

frederix.pdf

16:35 Coffee break

4 The present and future of four top operators

Based on https://arxiv.org/abs/2010.05915.

Speaker: Tobias Theil (Technical University of Munich)

FourTopDiscussion_Theil.pdf

5 Topping-up multilepton plus b-jets anomalies at the LHC with a Z′ boson

Based on https://arxiv.org/abs/2011.06514.

Speaker: Manuel Szewc (UNSAM)

talk_szewc.pdf

6 SMEFT@NLO and indirect constraints on top operators

Based on https://arxiv.org/abs/2008.11743.

Speaker: Ken Mimasu (King's College London)

Mimasu_4top.pdf

7 Four-top-quark signatures: from EFT to simplified models

Four-top-quark production offers a unique window into top-quark self-interactions and generic top-philic new physics. We study the accuracy of an EFT description of several simplified model scenarios for current new physics searches in four-top-quark final states at LHC. We establish along the way new limits based on the most recent experimental results, projections for the future reach of the HL-LHC and emphasise the necessity of a dedicated experimental search strategy for top-philic resonances in four top final states.

Speaker: Luc Jean Marie Darmé (INFN - National Institute for Nuclear Physics)

4top_DARME.pdf

8 Final discussion