Overview of Workshop and Updates on the Production of Backscattered Photon Beams and Muon Beams at the EIC

• Sekazi Mtingwa (US Nuclear Regulatory Commission)

We present the objectives of the second in a series of Workshops addressing various issues in the production of backscattered photon beams and muon beams for a variety of applications, including muon-ion colliders, µ+-µ- colliders, and novel nuclear/high energy physics phenomena. Also, we will provide an update on progress since the first Workshop on using backscattered photons at the EIC for the production of muon beams.

The "Muon Shot:" Muons as a pathway to the frontier

• Fredrick Olness (SMU Physics Department)

High-energy muon beams will play an essential role in future discoveries. For example, the recent P5 report outlined their vision for future facilities, including an aspirational collider labeled their "muon shot." The Muon-Ion-Collider (MuIC) is a natural step in this progression. It will enable precision measurements across a broad kinematic region and bridge the non-perturbative realm of dense nuclei to the high-energy realm of quarks and gluons. This program will illuminate extreme areas of QCD, pushing our perturbative predictions into the non-perturbative regime. These investigations include dense quark and parton distributions, which exhibit recombination and saturation. It will also enable high-precision measurements that will help us fully characterize the Standard Model interactions as we search for deviations that may signal "new physics" phenomena.

Updates from the Gamma Factory Study Group at CERN

• Mieczyslaw Krasny

The present status of the Gamma Factory project for CERN and its proof-of-principle experiment will be presented.

Coffee Break

Current Status of Muon Collider Studies

• J. Scott Berg (Brookhaven National Laboratory)

High energy physics results and studies from the last few years have led to a revival of interest in a muon collider with center of mass energy of around 10 TeV. The International Muon Collider Collaboration has been formed, led by CERN, to study and design such a muon collider. The P5 high energy physics prioritization panel has also advocated for a collider at that energy scale, and has particularly called out the possibility of such a machine being sited at Fermilab. I will give an update on the design work being done by the IMCC based on the presentations at their recent annual meeting. I will describe some early thinking about how the US community might respond to the recommendations of the P5 panel. And finally, I will reiterate some of the accelerator challenges of the current electron-ion collider that need to be addressed, based on a talk at the recent muon-ion collider workshop.

Perspectives on Muon Production from Backscattered Photons on Targets

• Sokhna Bineta Lo Amar (FRIB/UCAD)

Secondary beams at high intensity lepton facility

• marco battaglieri (INFN-GE)

Lunch

Collaboration Building for a Future muIC

• Ethan Cline (Stony Brook University)

There is significant desire in the high-energy community for a next generation lepton collider. Of particular interest is a “muon collider”, with a reference design that features a center-of-mass energy of 10 TeV, and an instantaneous luminosity of 10^35 cm^-2s^-1. The challenges in constructing such a collider should not be understated. As an R&D opportunity for this future muon collider, the proposed muon-ion collider, located at BNL, would offer the possibility of strong synergy between the nuclear and particle physics communities. Within this talk, I will highlight the need for collaboration between these communities, and outline the benefits to both, while encouraging the formation of a muon-ion collider collaboration to formalize design goals for the proposed machine.

Kinematic Reach Study for the MuIc

• Allen Pierre-Louis (Stony Brook university)

The high-energy physics community has shown significant interest in constructing a µ + µ− collider to probe a high center-of-mass energy regime. While such a collider would provide unique physics opportunities, significant research and development work needs to be completed before construction can commence. Once the physics program of the EIC has been completed, the existing infrastructure can be repurposed to host a future muon-ion collider. This muIC could be used as a test facility to address key accelerator requirements for a future µ+ µ− collider, while also completely providing a rich physics program in its own right. This study explores the kinematic reach of a muon-ion collider with muon beam energies of 18 to 200 GeV, and the distribution of Q^2 and Bjorken x, as well as pseudo-rapidity.

Physics Potential, Accelerator Options, and Experimental Challenges of a TeV-Scale Muon-Ion Collider

• Darin Acosta (Rice University)

A TeV muon-ion collider could be established if a high energy muon beam that is appropriately cooled and accelerated to the TeV scale is brought into collision with a high energy hadron beam at facilities such as Brookhaven National Lab, Fermilab, or CERN. Such a collider opens up a new regime for deep inelastic scattering studies as well as facilitate precision QCD and electroweak measurements and searches for beyond Standard Model physics, in an alternative and complementary way to the proposed LHC-electron collider. We revisit the potential physics program of a muon-ion collider and summarize some accelerator options. We also explore some of the associated experimental challenges to be addressed, including initial studies of a forward muon spectrometer design applicable for a muon-ion or muon-muon collider experiment.

Free-Electron Lasers as a Photon Driver for Compton Gamma-ray Sources

• Ying Wu

A nearly monochromatic, polarized gamma-ray beam is a powerful tool for nuclear physics research, spanning from collective motions to strong interactions between nucleons, and to the dynamics of quarks and gluons. Laser-driven Compton gamma-ray sources have been developed and operated worldwide since the late 1970s. With the advent of free-electron lasers (FELs), they have been adopted as the photon beam drive for several Compton gamma-ray sources around the world, including the High Intensity Gamma-ray Source (HIGS) at the Triangle Universities Nuclear Laboratory. The HIGS is currently the highest flux and most versatile source in operation. Driven by a high peak power storage ring free-electron laser (FEL), the HIGS produces highly polarized gamma-ray beams with energies ranging from 1 to 120 MeV, achieving a peak performance of total flux up to 3.5E10 g/s and a spectral flux of more than 1E3 g/s/eV in the 10 MeV region. In this presentation, I will describe the FEL-driven Compton sources using the HIGS as an example. I will present our recent developments to increase the beam flux, expand gamma-ray beam production to higher energies, and create new beam capabilities. We will also discuss the potential benefits of using the FEL as the photon source for a resonant Compton gamma-ray source, such as the Gamma Factory.

Status and Prospects of EIC - and DIS with muon beam beyond....EIC

• Abhay Deshpande (Stony Brook University & CFSN)

Closeout

• Sekazi Mtingwa (US Nuclear Regulatory Commission)