Abstract
In order to study the interactions and structure of various types of matter, one typically needs to carry out scattering experiments utilizing many different particles as projectiles. Whereas beams of e^{±}, μ^{±}, π^{±}, K^{±}, protons, antiprotons, and various heavy ions have been produced and have enabled many scientific breakthroughs, beams of antineutrons, hyperons (Λ, Σ, and Ξ) and their antiparticles are typically not easy to obtain. Here we point out and investigate a new high-quality source of these particles: a super-J/ψ factory with the capability of accumulating trillions of J/ψ decays each year. In the relevant J/ψ decays, the desired particle is produced together with other final-state particles that can be tagged. This allows accurate determination of the flux and momentum of the projectile, enabling unprecedented precision in the study of the corresponding interactions with a broad range of targets. These novel high-statistics sources of baryons and antibaryons with precisely known kinematics open fresh opportunities for applications in particle and nuclear physics, including antinucleon-nucleon interaction, a nonvalence ss[over ¯] component of the nucleon, (anti)hyperon-nucleon interaction, OZI violation, (multistrange) hypernuclei, exotic light hadron spectroscopy, and many others, as well as calibration of MonteCarlo simulation for hadronic and medical physics.
Highlights
Cornucopia of Antineutrons and Hyperons from a Super J=ψ Factory for Next-Generation Nuclear and Particle Physics High-Precision Experiments
The best antineutron sources so far have been obtained at BNL E-767 [3] and the CERN OBELIX experiments [4], enabling quite a wide range of physics topics to be studied, from nuclear physics to hadron spectroscopy, albeit with limited statistics
By tagging the particles recoiling against an antineutron orhyperon in J=ψ decays, the momentum and direction of these source particles can be determined precisely, and the interaction with the target material placed outside of a very smallradius eþe− beam pipe allows substantial high-precision measurements related to particle and nuclear physics
Summary
Cornucopia of Antineutrons and Hyperons from a Super J=ψ Factory for Next-Generation Nuclear and Particle Physics High-Precision Experiments. In the relevant J=ψ decays, the desired particle is produced together with other final-state particles that can be tagged This allows accurate determination of the flux and momentum of the projectile, enabling unprecedented precision in the study of the corresponding interactions with a broad range of targets. These novel high-statistics sources of baryons and antibaryons with precisely known kinematics open fresh opportunities for applications in particle and nuclear physics, including antinucleon-nucleon interaction, a nonvalence sscomponent of the nucleon, (anti) hyperon-nucleon interaction, OZI violation, (multistrange) hypernuclei, exotic light hadron spectroscopy, and many others, as well as calibration of Monte Carlo simulation for hadronic and medical physics. Ground-state SUð3Þ octet hyperons (Λ, Σþ;−, Ξ0;−) and their antiparticles have relatively long lifetimes (with a typical cτ of a few centimeters) and are essential for
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