Publication

Study of the Reactions n¯ p →2π+π-, 2π+π-π0, and 2π+π-2π0 Using J/ψ →pπ-n¯

2026

Abstract

We report an experimental investigation of the reactions n¯p→2π+π-, n¯p→2π+π-π0, and n¯p→2π+π-2π0 using (10.087±0.044)×109 J/ψ events collected with the BESIII detector at the BEPCII storage ring. The antineutron (n¯) is produced in the decay J/ψ→pπ-n¯ with studied momentum from 200 to 1174 MeV/c, while the target proton originates from the hydrogen nuclei in the cooling oil of the beam pipe. This novel method pioneers the study of n¯-nucleon interactions at an e+e- collider, providing the first experimental data for n¯ momenta exceeding 800 MeV/c.

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2026

Abstract

Official source

Related concepts (32)

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A collider is a type of particle accelerator that brings two opposing particle beams together such that the particles collide. Colliders may either be ring accelerators or linear accelerators. Colliders are used as a research tool in particle physics by accelerating particles to very high kinetic energy and letting them impact other particles. Analysis of the byproducts of these collisions gives scientists good evidence of the structure of the subatomic world and the laws of nature governing it.

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The Large Hadron Collider (LHC) is the world's largest and highest-energy particle collider. It was built by the European Organization for Nuclear Research (CERN) between 1998 and 2008 in collaboration with over 10,000 scientists and hundreds of universities and laboratories, as well as more than 100 countries. It lies in a tunnel in circumference and as deep as beneath the France–Switzerland border near Geneva. The first collisions were achieved in 2010 at an energy of 3.

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