Using muons from backscattered photons on targets for various studies at the EIC



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Paul Gueye (FRIB), Sekazi Mtingwa

Most proposals involving the use of muon beams utilize protons on targets to produce pions, which then decay into muons for various studies.  Such muon beams usually require emittance cooling before they are useful.  However, an alternative is to use muon beams produced by backscattered photon beams on suitable targets, thereby obviating the need for muon beam cooling.  Preliminary studies indicate that the EIC’s electron beam of ~20 GeV yields ~5 x 10^13 photons/sec of energy ~5 GeV.  Simulations are currently being performed to understand the kinematics of muons produced from the EIC backscattered photons on various targets.

In this workshop, we will look deeper into muon beams from backscattered photons on various targets and discuss physics implications from their use.  This should be an important extension of the EIC.

  • Abhay Deshpande
  • Angela Papa
  • Ankan Banerjee
  • Anna Kowalewska
  • Armen Apyan
  • Bidyut Jyoti Roy
  • Bineta Amar
  • Christine Darve
  • Darin Acosta
  • Dener De Souza Lemos
  • E. C. Aschenauer
  • Ethan Cline
  • Fredrick Olness
  • Hamlet Mkrtchyan
  • J. Scott Berg
  • Mieczyslaw Witold Krasny
  • Paul Gueye
  • Peter Delfyett
  • Rajeev Singh
  • Ross Corliss
  • Sekazi Mtingwa
  • Tapasi Ghosh
  • Wei Li
  • Wieslaw Placzek
  • William Delooze
  • Ying Wu
  • Yong-Chull Jang
Local Organizer
    • Morning Session
      • 1
        Welcome and Overview
      • 2
        Timescale for the EIC and Next Generation Systems, e.g., Muon Beams & Muon-Ion Collider
        Speaker: Abhay Deshpande (Stony Brook University)
      • 3
        Status of PSI Muon Beams and Charged Lepton Flavor Violation
        Speaker: Angela Papa (PSI and UniPi-INFN)
      • 4
        Production and Applications of Muons from Backscattered Photons at the EIC

        Most muon production mechanisms at nuclear particle facilities use protons on targets. At the EIC, there is an alternative, namely the possibility to use the high energy electron beam to backscatter laser photons onto targets to produce the muons. We describe this mechanism for the EIC electron kinematic regime and possible applications of the muons produced. In addition, we provide an overview of the Workshop, the relationship among the various ideas to be discussed, and comment on a path forward.

        Speaker: Sekazi Mtingwa
      • 5
        State of Laser Technology/Laser Focusing and Control

        This presentation will review the current state of the art of laser technology, spanning the extremes of both ultrafast and high power, that have the potential to be used laser based accelerator technology.

        Speaker: Peter Delfyett (CREOL, The College of Optics & Photonics, Univ. Central Florida)
      • 6
        Accelerator-driven Compton gamma-ray source: High Intensity Gamma-ray Source

        A nearly monochromatic, polarized gamma-ray beam is a powerful tool
        for nuclear physics research, ranging 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. The High Intensity Gamma-ray Source (HIGS)
        at the Triangle Universities Nuclear Laboratory 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, with a peak performance of total flux up
        to 3E10 g/s and a spectral flux of more than 1E3 g/s/eV in the 10 MeV region.
        In this presentation, I will discuss the operation principle of the
        HIGS facility, developments to achieve a wide energy range, maximum flux,
        and high resolution, as well as new capabilities being developed such as
        pulsed mode operation, two-color beams, and precision polarization control.
        I will also comment on the possible directions for next-generation Compton
        gamma-ray sources driven by conventional charged particle accelerators.

        Speaker: Prof. Ying Wu (Duke University)
      • 7
        Gamma-Factory@CERN - status and perspectives

        In this talk, I shall present the status of the Gamma Factory studies. I shall briefly summarise the potential applications of the Gamma Factory tools in many branches of science, discuss the accelerator and laser system requirements, and present the status of the Gamma Factory proof-of-principle SPS experiment preparations.

        Speaker: Mieczyslaw Witold Krasny (
    • Lunch
    • Afternoon Session
      • 8
        Muon Production from Backscattered Photons on Targets at the EIC
        Speaker: Paul Gueye (FRIB)
      • 9
        A Future Muon-Ion Collider at Brookhaven National Laboratory: Muon Accelerator Systems

        There has been significant discussion in the community regarding a future $\mu^+\mu^-$ collider. While such a facility is still decades away from realization, it is also understood that significant technological development and feasibility demonstrations are necessary at lower beam energies. Here we propose such a possibility coupled with a rich physics program. We propose a future Muon-Ion Collider that would serve as a natural extension to the EIC program currently planned in the 2030’s and 40’s. We envision this collider would be implemented as an upgrade to the EIC, with $\mu$ beam energies between 18 GeV and 200 GeV and a luminosity of 1033 cm−2s−1. In this presentation we discuss the challenges of generating $\mu$ beams that satisfy the design requirements of such a collider, and review some current efforts in the field to design such beams. We discuss the physics reach of a future muon-ion collider and identify opportunities for synergy between the nuclear and particle physics communities.

        Funding acknowledgment: This material is based upon work supported by the National Science Foundation under Grant No. PHY 2012114, and the Center for Frontiers in Nuclear Science at Stony Brook University.

        Speaker: Ethan Cline (Stony Brook University)
      • 10
        Muon-Ion Collider: Physics Perspectives

        The development of muon accelerator and storage ring technology at the TeV scale provides enormous scientific potential not only for a mu+mu- collider, but also for deep inelastic scattering in a completely new regime when a TeV muon beam is brought into collision with a high-energy hadron beam. For example, if the Electron-Ion Collider at BNL were eventually upgraded with a TeV muon beam replacing its low energy electron ring, a $Q^2$ reach of up to $10^6$ GeV$^2$ is accessible and a parton momentum fraction $x$ down to $1.0\times 10^{-5}$ can be probed. Such a Muon-Ion collider provides a natural first science case for the development of high-energy muon accelerator technology. In this talk we summarize the science case for a muon-ion collider, which includes precision structure function measurements, QCD and electroweak measurements, standard model particle production and coupling measurements including the Higgs boson, and searches for beyond standard model physics in second-generation fermion couplings such as Z-prime and leptoquark production.

        Speaker: Darin Acosta (Rice University)
      • 11
        Gamma Factory High Intensity Muon Source - Exploratory Studies

        One of the fundamental challenges for the future leptonic colliders and neutrino factories is to design and construct new high-intensity sources of muons. The next-generation sources should increase the intensity of the presently operating ones by at least three orders of the magnitude and include an important option of producing longitudinally polarized muons. The main effort to achieve this goal has been focused on the proton-beam-driven muon sources. We present exploratory studies of an alternative scheme which is based on high-intensity megawatt-class photon beams. Such beams can be delivered in the future by the Gamma Factory (GF) project. One of the GF multiple goals is to increase the energy range and the intensity of the presently operating photon sources. Such a leap can be achieved by extending the present hadron-collider modus operandi of the LHC with the new GF-operation-mode, allowing to collide atomic beams with laser pulses. The exploratory studies demonstrate that more than 10^13 muons of both signs per second can be produced by the GF source.

        Speaker: Armen Apyan (A. Alikhanyan National Laboraory (AANL) Yerevan, Armenia)
      • 12
        MuIC Phenomenology & Exploring QCD in extreme kinematic regions

        The MuIC will enable precision measurements across a broad kinematic
        region. This will allow us to extend our explorations into extreme
        areas of QCD, pushing our perturbative predictions into the
        non-perturbative regime. These investigations include dense quark and
        parton distributions at low x and Q, which exhibit recombination and
        saturation. Such high-precision measurements will help us fully
        characterize the various manifestations of the QCD theory.

        Speaker: Fredrick Olness (SMU)
      • 13
        Muon Source Studies
        Speaker: J. Scott Berg (Brookhaven National Laboratory)
      • 14
        Organization and Next Steps
        Speaker: Sekazi Mtingwa
      • 15