The perspective of high energy and high duty cycle polarized positron beams in complement to the existing CEBAF (Continuous Electron Beam Accelerator Facility) electron beams is attracting a lot of interest. Following the proof-of-principle PEPPo (Polarized Electrons for Polarized Positrons) experiment demonstrating a new scheme for producing highly polarized positrons, the Jefferson Lab (JLab) Positron Working Group (PWG) engaged in the thorough development of the experimental program that would be achieved at JLab with such beams. It encompasses the determination of the physics quantities that characterize nucleons and nuclei structure: electromagnetic form factors, generalized polarizabilities, parton distributions, and generalized parton distributions. It also concerns some of the hottest questions of the field as the charge radius of the proton and the occurrence of physics beyond the standard model through the search of low mass dark matter particles, the measurement of weak neutral-current couplings, and the investigation of charged lepton flavour violation.
This special issue published in EPJ A presents a coherent collection of experimental and/or theoretical works detailing the experimental program and physics accessible to positron beams at JLab. This program, which represents already several years of actual beam running, should not be understood as exhaustive but more surely as the minimal impact of future CEBAF positron beams on the nuclear physics science.
All articles of the special issue “An Experimental Program with Positron Beams at Jefferson Lab” are available here and are freely accessible until 22 May 2022. For further information, please read the Editorial.
This was our first experience of publishing with EPJ Web of Conferences. We contacted the publisher in the middle of September, just one month prior to the Conference, but everything went through smoothly. We have had published MNPS Proceedings with different publishers in the past, and would like to tell that the EPJ Web of Conferences team was probably the best, very quick, helpful and interactive. Typically, we were getting responses from EPJ Web of Conferences team within less than an hour and have had help at every production stage.
We are very thankful to Solange Guenot, Web of Conferences Publishing Editor, and Isabelle Houlbert, Web of Conferences Production Editor, for their support. These ladies are top-level professionals, who made a great contribution to the success of this issue. We are fully satisfied with the publication of the Conference Proceedings and are looking forward to further cooperation. The publication was very fast, easy and of high quality. My colleagues and I strongly recommend EPJ Web of Conferences to anyone, who is interested in quick high-quality publication of conference proceedings.
On behalf of the Organizing and Program Committees and Editorial Team of MNPS-2019, Dr. Alexey B. Nadykto, Moscow State Technological University “STANKIN”, Moscow, Russia. EPJ Web of Conferences vol. 224 (2019)