LHC TOP WG meeting

29 Nov 2023, 14:00 → 1 Dec 2023, 18:00 Europe/Zurich

Fabio Maltoni (Universite Catholique de Louvain (UCL) (BE) and Università di Bologna), Maria Aldaya Martin (DESY), Wolfgang Wagner (Bergische Universitaet Wuppertal (DE))

This periodic open meeting of the LHC TOP Working Group takes place twice a year at CERN. The meeting provides a forum for discussion between experimentalists and theorists on the latest developments in top quark physics. Everybody is welcome to attend; please register using the link below. 

The meeting will take place remotely via zoom. 

Recordings of the sessions will be available below once the meeting is over.

OpenMeeting_LHCtopWG_01122023.mp4

OpenMeeting_LHCtopWG_29112023.mp4

OpenMeeting_LHCtopWG_30112023.mp4

Wednesday 29 November

14:00 → 15:30 Session 1

Conveners: Prof. Fabio Maltoni (Universite Catholique de Louvain (UCL) (BE) and Università di Bologna), Maria Aldaya Martin (DESY), Wolfgang Wagner (Bergische Universitaet Wuppertal (DE))

14:00 Introduction

Speakers: Prof. Fabio Maltoni (Universite Catholique de Louvain (UCL) (BE) and Università di Bologna), Maria Aldaya Martin (DESY), Wolfgang Wagner (Bergische Universitaet Wuppertal (DE))

LHCtopWG_open_meeting_intro_nov23.pdf

14:20 Discussion

14:30 CMS highlight 1: Search for extra Higgs bosons through same-sign top-quark production in association with an extra jet

Speaker: Efe Yazgan (National Taiwan University (TW))

toplhcwg_29nov2023_eyazgan.pdf

14:50 Discussion

15:00 ATLAS highlight 1: Inclusive and differential ttZ cross-section measurement, including interpretations, with the full ATLAS Run 2 dataset

ATLAS-CONF-2023-065: https://cds.cern.ch/record/2873519
https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2023-065

Speaker: Dominik Babal (Slovak Academy of Sciences (SK))

ttZ_LHC_topWG_v4.pdf

15:20 Discussion

15:30 → 16:00 Coffee break

16:00 → 17:30 Session 2

Conveners: Prof. Fabio Maltoni (Universite Catholique de Louvain (UCL) (BE) and Università di Bologna), Maria Aldaya Martin (DESY), Wolfgang Wagner (Bergische Universitaet Wuppertal (DE))

16:00 Comparison of the latest CMS and ATLAS measurements on FCNC in the top-quark sector

Speaker: Daniel Spitzbart (Boston University (US))

tHq_FCNC_LHC_TOP_WG.pdf

16:20 Discussion

16:30 Progress report on a combined EFT analysis of ATLAS and CMS results

Speakers: Baptiste Ravina (Georg August Universitaet Goettingen (DE)), Kirill Skovpen (Ghent University (BE))

kskovpenLHCtopWG.pdf

16:50 Discussion

17:00 Indirect constraints on top quark operators from a global SMEFT analysis

https://arxiv.org/abs/2310.00047

Speaker: Alfredo Stanzione

Talk_AS_Indirect_Constraints.pdf

17:20 Discussion

Thursday 30 November

10:00 → 12:30 Session 1: Modeling of top-quark final states

Conveners: Prof. Fabio Maltoni (Universite Catholique de Louvain (UCL) (BE) and Università di Bologna), Maria Aldaya Martin (DESY), Wolfgang Wagner (Bergische Universitaet Wuppertal (DE))

10:00 Latest developments in Herwig 7

Speaker: Simon Platzer (University of Graz (AT))

slides-top.pdf

10:20 Discussion

10:30 Studies on the improvement of the matching uncertainty definition in top-quark processes simulated with Powheg+Pythia 8

ATL-PHYS-PUB-2023-029: https://cds.cern.ch/record/2872787

Speaker: Katharina Voss (Universitaet Siegen (DE))

ATLAS_TopModelling_LHCTopWGNov23.pdf

10:50 Discussion

11:00 Modeling of tTbar with Powheg bb4l

Speaker: Laurids Jeppe (Deutsches Elektronen-Synchrotron (DE))

LHCTopWG bb4l 301123 v3.pdf

11:20 Discussion

11:30 Top quark physics with Pythia

Speaker: Christian Preuss (University of Wuppertal)

top_wg_ctp.pdf

11:50 Discussion

12:00 Decay matrix element corrections in MC@NLO-type simulations with Pythia8

Speaker: Stefano Frixione (INFN)

topmec.pdf

12:20 Discussion

12:30 → 14:00 Lunch break

14:00 → 14:20 SUSY searches in tTbar+MET and tc+MET final states with ATLAS

ATLAS conference notes:
https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2023-043/
and
https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2023-058/

Speaker: Simran Sunil Gurdasani (Albert Ludwigs Universitaet Freiburg (DE))

LHC_TopWG_ttMET_tcMET_Gurdasani_animated.pdf

14:20 → 14:30 Discussion

14:30 → 15:30 Session 2: Top-philic axion festival

Convener: Fabio Maltoni (Universite Catholique de Louvain (BE))

14:30 On the coupling of axion-like particles to the top quark

https://arxiv.org/abs/2303.17634

Speaker: Fabian Esser

ALPs_Top_LHCTop.pdf

14:45 ALP effects in top-pair production

Speaker: Vu Phan

Top-in-the-ALPs.pdf

15:00 Phenomenology of an elusive top-philic ALP at the LHC

Speaker: Alberto Mariotti (Vrije Universiteit Brussel)

TopPhilic_ALP_Mariotti.pdf

15:15 Distinguishing axion-like particles and CP-odd Higgs bosons in ttbar final states at the LHC

Speaker: Christian Schwanenberger (Deutsches Elektronen-Synchrotron (DE))

LHCTopWG_ALPs_Pseudoscalar.pdf

15:30 → 15:55 Discussion

15:55 → 16:15 Higgs interference effects in top-quark pair production in the 1HSM

2309.16759: https://inspirehep.net/literature/2704864

Speaker: Alexander Lind (Subatech, IMT Atlantique)

Lind_LHCTopWG.pdf

16:15 → 16:25 Discussion

16:25 → 16:50 ATLAS highlight 2: Ttbar+jets in ATLAS and a comparison with the CMS triple differential cross-section measurement, and tTbar in pPb collisions

Speakers: Henriette Aarup Petersen (Deutsches Elektronen-Synchrotron (DE)), Miguel Angel Principe Martin (Universidad Autónoma de Madrid)

TopLHC_231130_mprincipe.pdf

16:50 → 17:00 Discussion

Friday 1 December

09:30 → 12:30 Session 1: Quantum entanglement in tTbar production

Conveners: Prof. Fabio Maltoni (Universite Catholique de Louvain (UCL) (BE) and Università di Bologna), Maria Aldaya Martin (DESY), Wolfgang Wagner (Bergische Universitaet Wuppertal (DE))

09:30 Summary of the Quantum Observables discussions at GGI

Speaker: Marcel Vos (IFIC Valencia (ES))

QuantumHEPsummary.pdf

09:50 Discussion

10:00 Observation of quantum entanglement with the ATLAS detector

Speaker: Ethan Lewis Simpson (University of Glasgow (GB))

atlas_entanglement.pdf

10:20 Discussion

10:30 Quantum Entanglement and Bell Inequality Violation in Semi-Leptonic Top Decays

https://arxiv.org/abs/2310.17696

Speaker: Arthur Wu (Pitt)

Quantum in Semi-Leptonic Top Decay.pdf

Quantum in Semi-Leptonic Top Decay.pptx

10:50 Discussion

11:00 Close out