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Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

First Study of Reaction Ξ^{0}n→Ξ^{-}p Using Ξ^{0}-Nucleus Scattering at an Electron-Positron Collider.

M Ablikim¹, M N Achasov², P Adlarson³

¹Institute of High Energy Physics, Beijing 100049, People's Republic of China.

Physical Review Letters

|July 7, 2023

Summary

Researchers studied hyperon-nucleon interactions using J/ψ events. They measured the cross section for Ξ⁰ + ⁹Be → Ξ⁻ + p + ⁸Be, finding no H-dibaryon signal.

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Area of Science:

Particle Physics
Nuclear Physics
Hadron Spectroscopy

Background:

Hyperon-nucleon interactions are crucial for understanding nuclear structure and the properties of dense nuclear matter.
Previous studies of hyperon-nucleon interactions have been limited, particularly in the context of electron-positron collisions.

Purpose of the Study:

To investigate the Ξ⁰n → Ξ⁻p reaction using J/ψ events collected at the Beijing Spectrometer III (BESIII).
To measure the cross section for the reaction Ξ⁰ + ⁹Be → Ξ⁻ + p + ⁸Be.
To search for evidence of the H-dibaryon in the Ξ⁻p final state.

Main Methods:

Utilized (1.0087±0.0044)×10¹⁰ J/ψ events collected with the BESIII detector at the BEPCII storage ring.
Studied the Ξ⁰ baryon produced in J/ψ → Ξ⁰Ξ⁰̄ decays, with neutrons from ⁹Be, ¹²C, and ¹⁹⁷Au nuclei.
Analyzed the Ξ⁻p final state for H-dibaryon signals.

Main Results:

Observed a clear signal for the Ξ⁰n → Ξ⁻p process with a statistical significance of 7.1σ.
Determined the cross section for Ξ⁰ + ⁹Be → Ξ⁻ + p + ⁸Be to be (22.1±5.3stat±4.5sys) mb at a Ξ⁰ momentum of 0.818 GeV/c.
Found no significant H-dibaryon signal in the Ξ⁻p final state.

Conclusions:

This study provides the first measurement of hyperon-nucleon interactions in electron-positron collisions.
The results open a new avenue for exploring hyperon-nucleon dynamics and searching for exotic hadrons.
The absence of an H-dibaryon signal places constraints on its existence in this specific interaction channel.