PNU workshop on Composite Higgs : Lattice study and all

19 Feb 2024, 13:00 → 23 Feb 2024, 14:00 Asia/Seoul

Haeundae, Busan

Deog Ki Hong (Pusan National University (KR))

Since the dicovery of Higgs particle at LHC, 2012, enormous efforts are currently being made to discern physics associated with Higgs particle. Though we have not discovered any new physics beyond standard model at LHC, the possiblity of Higgs particle being a composite state of new strong dynamics is still iimtriguing and promising. We report the lattice investigation on the composite Higgs model and discuss about its current developement together with world experts to search for the future directions.   

Kolon Seacloud Hotel (Workshop first accommodation)

pnu_lattice_chairs.pdf

pnu_lattice_schedule.pdf

The Westin Chosen (Workshop venue and second accommodation)

Monday 19 February

14:00 → 15:30 afternoon 1

Convener: Deog Ki Hong (Pusan National University (KR))

14:00 Registration

Speaker: Deog Ki Hong (Pusan National University (KR))

14:30 Non-perturbative aspects of composite Higgs models

Abstract: We live in a golden age for the study of non-perturbative aspects of field theories. Developments in effective field theory, gauge-gravity dualities, and lattice field theories make it possible to study with unprecedented accuracy models of new physics with strongly coupled origin, with relevant examples taken from the literature on composite Higgs models. We discuss in particular the current programme of exploration of lattice Sp(2N) gauge theories, highlighting some of its results, and proposing future directions of study.

Speaker: Prof. Maurizio Piai (Swansea)

Compositeness2024.pdf

15:30 → 16:00 Break

16:00 → 17:00 afternoon 2

Convener: Gabriele Ferretti

BusanCompositeness.pdf

16:00 Gauging the Maximal Compact Subgroup of a Simple Lie Group

Abstract: I will consider a class of theories where the gauge group K is the maximal compact subgroup of a non-compact simple group G (e.g., K=U(1) and G=SU(1,1) ). The matter fields are fermions in a unitary representation of G which decomposes to an infinite sum of irreps of K. The Zeta-function method regularizes the infinite sum over the fermions in loop diagrams. Some of these gauge theories (even the abelian one!) are asymptotically free and have an IR stable fixed point. Could Quarks and leptons be bound states of such a gauge theory?

Speaker: Sarada Rajeev (University of Rochester)

17:00 → 18:00 Discussions

18:00 → 20:00 reception

Convener: Deog Ki Hong (Pusan National University (KR))

Tuesday 20 February

09:30 → 10:30 morning 1

Convener: Maurizio Piai (Swansea)

Busan.pdf

09:30 Vacuum misalignment for electroweak symmetry breaking

Abstract: We discuss ways to trigger vacuum misalignment in strongly coupled gauge theories of interest to electroweak symmetry breaking. In these models the Higgs boson is realized as a pseudo-Nambu-Goldstone boson and acquires a vacuum expectation value due to the interaction of the Standard Model fermions with the fermionic bound states of the strong sector. We present sum rules that can be used to identify the cases where vacuum misalignment occurs with an eye on possible applications to lattice simulations.

Speaker: Gabriele Ferretti

10:30 → 11:00 coffee break

11:00 → 12:00 morning 2: Lattice Studies of Conformal and Near-conformal Systems

Convener: Maurizio Piai (Swansea)

11:00 TBA

Speaker: Anna Hasenfratz (university of colorado boulder)

Hasenfratz_Busan.pdf

12:00 → 14:30 Lunch

14:30 → 15:30 afternoon 3

Convener: Jong-Wan Lee (IBS-CTPU)

14:30 Composite Dark Matter Models from Sp(2N) Gauge Theory

Speaker: Fabian Zierler (Swansea University)

zierler_busan_2024.pdf

15:30 → 16:00 Coffee break

16:00 → 18:00 afternoon 4

Convener: Gabriele Ferretti

16:00 Free discussions

Speaker: Gabriele Ferretti

Wednesday 21 February

09:30 → 10:30 morning 3

Convener: Deog Ki Hong (Pusan National University (KR))

09:30 Lattice simulations with domain wall fermions

We present the basics and the current status of dynamical ensemble
generation and measurements with Domain Wall Fermions.
Experiences in controlling the extent of the 5th dimension and the
residual symmetry breaking is discussed.

Speaker: Chulwoo Jung (Brookhaven National Laboratory)

PNU24_Jnug.pdf

10:30 → 11:00 Coffee break

11:00 → 12:00 Morning 4

Convener: Deog Ki Hong (Pusan National University (KR))

11:00 Reproducibility efforts in Sp(2N)

Abstract: Explicit reproducibility—the ability for others to obtain the same results by analysing the same data using the same techniques—is becoming an increasing requirement from funders and journals. For the last two years, our collaboration has sought to provide with each journal publication associated data and software, such that the plots and tables presented in the paper can be regenerated precisely from the corresponding data. In this talk, after motivating this effort, I will describe the process we have followed to date and the releases that have been published, including some of the challenges that this approach has raised. I will then discuss possible future directions of travel, to improve both the efficiency and the effectiveness of this process.

Speaker: Ed Bennett

Reproducibility efforts in Sp(2𝑁)

12:00 → 14:30 Lunch

14:30 → 15:30 Afternoon 5

Convener: Anna Hasenfratz (university of colorado boulder)

sp2n_lee_final.pdf

14:30 TBA

Speaker: Dr Jong-Wan Lee (IBS-CTPU)

15:30 → 16:00 Coffee break

16:00 → 18:00 Afternoon 6

Conveners: Maurizio Piai (Swansea), Deog Ki Hong (Pusan National University (KR))

16:00 Discussions

Speaker: Maurizio Piai (Swansea)

17:00 Zoom presentations

Speakers: Biagio Lucini, Prof. C.-J. David Lin (National Yang Ming Chiao Tung University), Davide Vadacchino

Thursday 22 February

09:30 → 10:30 morning 5

Convener: Fabian Zierler (Swansea University)

09:30 Phenomenology of composite resonances in a realistic composite Higgs model

Abstract: Composite Higgs models have been proposed and classified based on a confining gauge interactions and two species of fermions. The spectrum of such theories can be studied on the Lattice. I will discuss the phenomenology of various types of resonances which are always present in such models. Many states feature exotic quantum numbers and interesting final states that can be searched for at the LHC and future colliders.

Speaker: Giacomo Cacciapaglia (Centre National de la Recherche Scientifique (FR))

Cacciapaglia_Busan.pdf

10:30 → 11:00 Coffee break

11:00 → 12:00 Morning 6

Convener: Fabian Zierler (Swansea University)

11:00 Uncovering doubly charged scalars with dominant three-body decays using machine learning

Abstract: Many underlying models of a composite Higgs predict additional composite scalar resonances which can be searched for at the LHC. In this talk we present a survey of experimental constraints on pair-produced scalar resonances with decay channels motivated by underlying models of a composite Higgs. In the second part, we focus on a particular signature -- pair-produced  doubly-charged scalars with dominant three-body decays -- and show how machine-learning based search strategies can improve the discovery reach at the LHC.

Speaker: Thomas Dieter Flacke (Korea Advanced Institute of Science and Technology (KR))

12:00 → 14:30 Lunch

14:30 → 15:30 Afternnon 7

Convener: Ed Bennett

14:30 Lattice investigations of the chimera baryon spectrum in the Sp(4) gauge theory

Abstract: We study the Sp(4) gauge theory coupled to hyperquark matter fields. This theory potentially serves as an ultraviolet completion of the Standard model in the framework of composite Higgs models that utilise partial compositeness to generate the top-quark mass. We focus on the spectroscopy of chimera baryons, which are composite states composed of two fundamental and one antisymmetric hyperquarks. The chimera baryons having the same quantum number as the top quark are the top partners, which effectively lift the mass of the top quark by mixing with it. Specifically, we investigate, in the quenched approximation, the three lowest-lying parity-even states: Λ_{CB}, Σ_{CB} (both with spin 1/2), and Σ*_{CB} (spin 3/2). The spin-1/2 states are considered as top partner candidates. We extrapolate our results to the continuum and massless limits by applying an effective treatment inspired by Wilson chiral perturbation theory. This study sets the stage for our ongoing lattice simulations with the dynamical hyperquarks.

Speaker: Mr Paul Hsiao (NYMCTU)

PNU_Ho.pdf

15:30 → 16:00 Coffee break

16:00 → 18:00 Afternoon 8

Convener: Ed Bennett

forzano_busan.pdf

16:00 Finite volume spectroscopy on the lattice using the HLT method

Abstract: Spectroscopy is a fundamental matter in lattice gauge theories. In this talk, I will inspect a new technique used to perform finite volume spectroscopy, by fitting spectral densities. This will be shown, giving an overview of how one provides an estimate for spectral densities, and how to fit them. This will be done focusing on a mixed representation (fundamental and two-index antisymmetric fermions) Sp(4) gauge theory as a case study. Systematic sources of errors and comparisons with GEVP results will be discussed as well.

Speaker: Mr Niccolo Forzano (Swansea)

forzano_busan.pdf

17:00 Discussions

Speaker: Dr Jong-Wan Lee (IBS-CTPU)

18:00 → 20:30 Banquet

Friday 23 February

09:30 → 10:30 Morning 7: Discussions

Convener: Jong-Wan Lee (IBS-CTPU)

10:30 → 11:00 Coffee break

11:00 → 12:00 Morning 8: Future directions

Convener: Maurizio Piai (Swansea)

12:00 → 14:00 Lunch