Science at the Luminosity Frontier: Jefferson Lab at 22 GeV

9 Dec 2024, 09:00 → 13 Dec 2024, 19:00 Europe/Rome

Auditorium B. Touschek (INFN-LNF)

This workshop will focus on the continuing development of the scientific case for a 22 GeV upgrade to CEBAF made possible by recent novel advances in accelerator technology. CEBAF’s envisioned capabilities, at the highest luminosities, will enable exciting opportunities that give scientists the full suite of tools necessary to comprehensively understand how QCD builds hadronic matter in the valence region. Through this workshop, JLab and its user community will continue to build the science case with descriptions and concrete projections for experiments that would become possible with an upgrade.  

We encourage our users and others interested to submit talks and ideas on the scientific topics listed below.
 

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Physics Topics:

• Charmed and light hadron spectroscopy
• Structure of hadrons: Form Factors, Parton Distribution Functions, TMDs, GPDs, Fragmentation Functions, Fracture Functions
• QCD in Nuclei and associated Nuclear Modifications and Dynamics
• Low energy tests of the Standard Model and physics beyond the Standard Model

Deadline for abstracts:

October 31

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Monday, 9 December

Welcome

Spectroscopy

Conveners: Dr Alessandro Pilloni (UniME & CT), Justin Stevens (William & Mary), Matthew Shepherd (Indiana University)

1 Spectroscopy at e+e- machines in the JLab 22 era

In the last 20 years, multiple exotic hadron candidates were discovered in experiments around the world. Electron-positron annihilation experiments have played a big role in those discoveries, starting from the initial discovery of the X(3872), and covering the charged bottom- and charmonium-like Zb and Zc states, and exotic vector meson candidates in both charmonium and bottomonium. Today, with BESIII and Belle II there are two running experiments in the charmonium and bottomonium regions, with a potential Super Tau-Charm Factory discussed as a successor experiment to BESIII. Here, I will review some recent results on XYZ-states from e+e- experiments, discuss the open issues that can be addressed with e+e- machines in the future, and why some of these open issues will benefit from an independent production process at JLab.

Speaker: Nils Hüsken (JGU Mainz)

10:50 Coffee

2 Exotic states at 22GeV era kaon beams

The KLF project aims to discover many new particles in the strange quark sector, elucidate the interaction of strange-quark containing baryons (hyperons) with nucleons and, through the unprecedented Kaon flux of 1 billion Kaons per day enable searches for rare KL decays at new limits. Alongside the hadron physics impact KLF can deliver key data for fundamental astrophysics including a deeper understanding of neutron star composition and of the early universe during the transition from deconfined plasma to hadrons through the strange epoch.

Existing 12GeV KL-Facility is mostly concentrated on low-energy kaon beams to look for single and double-strange hyperons, however there are several topics which require high energy neutral kaon beams, and where an extension of the JLab to 22GeV might be beneficial.
In this talk we will discuss the benefits of JLab upgrade and the use of high energy kaon beams for the Ω-baryon spectrum explorations.
The other topic which will be addressed is a strange-hidden-charm tetraquarks and pentaquarks production with kaon beams. Many of Zcs (Zcs ->J/Ψ K)and Ps (Ps ->J/Ψ Λ) states are considered to be of a molecular or dynamically-generated nature. For such states a strong dependence on production mechanism is expected. To address such questions in a non-strange sector a dedicated pion beam programme is considered at J-PARC, however similar states with strangeness would require the use of a strange beam, with the neutral kaon at KLF to be an interesting option realisable at 22GeV JLab facility.

Speaker: Mikhail Bashkanov (University of York)

3 Spectroscopy experiment of charmed and multi-strange baryons using hadron beam at the J-PARC hadron facility

Understanding hadron formation is one of the fundamental goals of hadron physics. It is essential way to investigate the effective degrees of freedom of hadrons such as the quark-quark correlation, namely the diquark correlation. Spectroscopic observations of charmed and multi-strange baryons can provide a unique opportunity to study diquark correlation. Systematic studies of charmed and multi-strange baryons are expected to reveal effective degrees of freedom for describing hadron structures. The hadron experimental facility at J-PARC aims at revealing hadron structures using the world's most intense meson beam. The J-PARC high-intensity and high-momentum beams can provide many opportunities to investigate the structure of hadrons, in which charm and strange quarks play an important role. High-momentum beam line, called the pi20 beam line, is under construction, and the charmed baryon spectroscopy experiment is planned. In the future, the Hadron Experimental Facility are extended to include beam lines with special capabilities. Dedicated high-momentum beam line called the K10 beam line, which can provide separated negative kaon beam up to 10 GeV/c, is planned to be constructed. Hadron beams are an essential tool for studying the excited states of charmed and strange baryons.

Speaker: Dr Kotaro Shirotori (Research Center for Nuclear Physics (RCNP), Osaka University)

13:00 Lunch

Tuesday, 10 December

Spectroscopy

Wednesday, 11 December

Contribution 2

Thursday, 12 December

Contribution 3

Friday, 13 December

Contribution 4