τ -lepton pair spin in proton-proton LHC collisions for anomalous dipole moments

IF 5.3 2区物理与天体物理 Q1 Physics and Astronomy Physical Review D Pub Date : 2025-01-24 DOI:10.1103/physrevd.111.013006

A. Yu. Korchin, E. Richter-Was, Yu. Volkotrub, Z. Was

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Abstract

The spin correlations in the pair of τ leptons produced in high-energy proton-proton collisions are studied. The invariant mass of the τ-lepton pair is chosen close to the Z-boson mass; in these conditions, Z-boson exchange gives the dominant contribution to the Drell-Yan mechanism. The interaction of Z bosons with τ leptons, in addition to the Standard Model couplings, can include weak anomalous magnetic and electric dipole moments (or form factors) of the τ lepton. The dependence of elements of the pp spin-correlation matrix on the weak anomalous moments is determined for various regions of the rapidity of the τ-lepton pair. Based on this calculation, we construct a semirealistic observable built on the momenta of pions in the τ∓→π∓ντ and τ±→ρ±ντ→π±π0ντ decay channels, and we show that this observable can be sensitive to the weak anomalous dipole moments.

Published by the American Physical Society

2025

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质子-质子LHC碰撞中异常偶极矩的τ -轻子对自旋

研究了高能质子-质子碰撞中产生的τ轻子对的自旋相关。τ-轻子对的不变质量选择在z -玻色子质量附近；在这些条件下，z -玻色子交换是Drell-Yan机制的主要贡献。除了标准模型耦合外，Z玻色子与τ轻子的相互作用可以包括τ轻子的弱反常磁偶极矩和电偶极矩（或形式因子）。在τ-轻子对的不同快速区，确定了pp自旋相关矩阵元素对弱异常矩的依赖关系。在此基础上，我们在τ +→π + ντ和τ±→ρ±ντ→π±π0ντ衰变通道中构建了一个基于介子动量的半真实观测，并证明了该观测对弱反常偶极矩敏感。2025年由美国物理学会出版

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.