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

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

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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.

ultraperipheral collisionsmagnetic and electric dipole momentsspin asymmetry

Dingyu Shao、Bin Yan、Shu-Run Yuan、Cheng Zhang

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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

Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

School of Physics,Peking University,Beijing 100871,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaShanghai Natural Science FoundationInstitute of High Energy PhysicsNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

122750521214710121ZR1406100Contract E25153U1117255201167500212235001

2024

10.1007/s11433-024-2389-y

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
年,卷(期)：2024.67(8)