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arXiv 1901.04003hep-exhep-ph
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直接测量τ轻子偶极矩的新方法

Novel method for the direct measurement of the tau lepton dipole moments

J. Fu, M. A. Giorgi, L. Henry, D. Marangotto, F. Martinez Vidal, A. Merli, N. Neri, J. Ruiz Vidal

摘要:

本文提出了一种直接测量τ轻子磁偶极矩和电偶极矩的新方法。实验方法依赖于从Ds+ -> tau+ nu_tau衰变中产生tau+轻子,这些衰变起源于LHC的固定靶碰撞。一个极化的tau+轻子的样本被运动学地选择,随后被引导到弯曲的晶体中。τ +轻子的磁矩和电偶极矩是通过确定晶体原子平面之间的强电磁场引起的自旋极化矢量的旋转来测量的。的实验技术进行了讨论,以及预期的灵敏度。

英文摘要:

A novel method for the direct measurement of the elusive magnetic and electric dipole moments of the tau lepton is presented. The experimental approach relies on the production of tau+ leptons from Ds+ -> tau+ nu_tau decays, originated in fixed-target collisions at the LHC. A sample of polarized tau+ leptons is kinematically selected and subsequently channeled in a bent crystal. The magnetic and electric dipole moments of the tau+ lepton are measured by determining the rotation of the spin-polarization vector induced by the intense electromagnetic field between crystal atomic planes. The experimental technique is discussed along with the expected sensitivities.

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