Production and decay of hyperons in a transversely polarized electron-positron collider

Cao, Xu; Liang, Yu-Tie; Ping, Rong-Gang

doi:10.1103/physrevd.110.014035

Phys. Rev. D

2024

DOI: 10.1103/physrevd.110.014035

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Production and decay of hyperons in a transversely polarized electron-positron collider

Xu Cao,

Yu-Tie Liang,

Rong-Gang Ping

Abstract: The self-polarization of relativistic electrons or positrons moving in a magnetic field at a storage ring occurs through the emission of spin-flip synchrotron radiation, known as the Sokolov-Ternov effect. The resulting transverse polarizations of the colliding electrons and positrons, away from the depolarization resonances, allow for precise investigation of the spin entangled hyperon-antihyperon pairs via virtual photon or charmonium decay. The feasibility study reveals a promising increase in the statistic… Show more

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Polarization analysis of two baryons with various spin combinations produced in electron-positron annihilation

Zhang,

Ping,

Liu

et al. 2024

Phys. Rev. D

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We develop a systematic approach to analyze polarization correlations of two baryons B1B¯2 produced in the electron-positron annihilation process. With spin density matrices for arbitrary spin particles established in the standard, the Cartesian, and the helicity forms, we provide analyses of polarization correlations for two baryons with various spin combinations. This framework can be applied to determine the spin and the parity of excited baryons, and therefore offers opportunities for the investigation of baryon spectrum and transition form factors in present and future electron-positron annihilation experiments. Published by the American Physical Society 2024

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Polarization analysis of two baryons with various spin combinations produced in electron-positron annihilation

Zhang,

Ping,

Liu

et al. 2024

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

Fundamental tests of P and CP symmetries using octet baryons at the J/ψ threshold

Du,

He,

et al. 2024

Phys. Rev. D

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We systematically investigate tests of the parity P and the combined parity and charge-conjugate CP symmetries from differential angular distributions of J/ψ decaying into the lowest-lying baryon pairs at BESIII and the next-generation super tau-charm facilities (STCFs). Large corrections from Z and W exchange induced parity-violating effects are found for J/ψ decays with large logarithms resummed up to O(αs). The parity-violating asymmetries on the production and the decay sides of J/ψ are both estimated to be of O(10−4), thus barely observable with the 10 billion J/ψ events currently collected at BESIII. Nevertheless, these asymmetries utilizing the current BESIII data already permit a measurement of the weak mixing angle with an absolute uncertainty δsw2≈0.09, corresponding to the first determination of sw2 at the J/ψ threshold. In the future, STCFs are estimated to improve this bound by a factor of ∼20 to δsw2≈0.005 within one year based on luminosity rescaling. We also obtain the 95% confidence level upper bounds on the electric dipole moments of the octet baryons, which are of O(10−18) e cm for BESIII and O(10−19) e cm for STCFs. These bounds are improved by 2 to 3 orders of magnitude in comparison with the only existing one on Λ from Fermilab. The method discussed in this work also paves a way for a first and direct measurement of the Ξ and Σ electric dipole moments. Published by the American Physical Society 2024

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Production and decay of hyperons in a transversely polarized electron-positron collider

Cited by 2 publications

References 47 publications

Polarization analysis of two baryons with various spin combinations produced in electron-positron annihilation

Polarization analysis of two baryons with various spin combinations produced in electron-positron annihilation

Fundamental tests of P and CP symmetries using octet baryons at the J/ψ threshold

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