中国科学:物理学 力学 天文学(英文版)2024，Vol.67Issue(8) ：15-21.DOI:10.1007/s11433-024-2389-y

Spin asymmetry and dipole moments in τ-pair production with ultraperipheral heavy ion collisions

Dingyu Shao Bin Yan Shu-Run Yuan Cheng Zhang
中国科学:物理学 力学 天文学(英文版)2024，Vol.67Issue(8) ：15-21.DOI:10.1007/s11433-024-2389-y
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Spin asymmetry and dipole moments in τ-pair production with ultraperipheral heavy ion collisions

Dingyu Shao 1Bin Yan 2Shu-Run Yuan 3Cheng Zhang4
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作者信息

  • 1. Department of Physics,Center for Field Theory and Particle Physics,Fudan University,Shanghai 200433,China;Key Laboratory of Nuclear Physics and Ion-beam Application(MOE),Fudan University,Shanghai 200433,China;Shanghai Research Center for Theoretical Nuclear Physics,National Natural Science Foundation of China(NSFC)and Fudan University,Shanghai 200438,China
  • 2. Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China
  • 3. School of Physics,Peking University,Beijing 100871,China
  • 4. Department of Physics,Center for Field Theory and Particle Physics,Fudan University,Shanghai 200433,China
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Abstract

The anomalous magnetic(MDM)and electric(EDM)dipole moments of the r lepton serve as crucial indicators of new physics beyond the standard model.Leveraging azimuthal angular asymmetry as a novel tool in ultraperipheral collisions(UPCs),we attain unparalleled precision in the study of these key properties.Driven by the highly linear polarization of coherent photons,this method uniquely enables both the MDM and EDM to contribute to the cos 2ø angular distribution in similar magnitudes.Impor-tantly,our approach substantially narrows the parameter space,excluding more than half of it compared to expected UPC-based measurements reliant solely on the total cross-section.This method not only provides improved constraints but also minimizes the need for additional theoretical assumptions,and offers a novel avenue to probe the EDM effects.

Key words

ultraperipheral collisions/magnetic and electric dipole moments/spin asymmetry

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基金项目

National Natural Science Foundation of China(12275052)

National Natural Science Foundation of China(12147101)

Shanghai Natural Science Foundation(21ZR1406100)

Institute of High Energy Physics(Contract E25153U1)

National Natural Science Foundation of China(11725520)

National Natural Science Foundation of China(11675002)

National Natural Science Foundation of China(12235001)

出版年

2024
中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
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