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arXiv 2307.07239hep-ph
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在准弹性 $ν_τ+n\ o τ^-+Λ_c$ 散射过程中利用极化的 $τ$ 和 $Λ_c$ 探测新物理

Probing new physics with polarized $τ$ and $Λ_c$ in quasielastic $ν_τ\!+\!n\!\to\! τ^-\!+\!Λ_c$ scattering process

Ya-Ru Kong, Li-Fen Lai, Xin-Qiang Li, Xin-Shuai Yan, Ya-Dong Yang, Dong-Hui Zheng

AI总结:

针对粲强子半轻子衰变缺失的空白,本文提出利用准弹性散射 $ν_τ+n\ o τ^-+Λ_c$ 中 $τ$ 和 $Λ_c$ 的极化来探测新物理,在有效拉格朗日框架下分析截面与极化,并指出形状因子不确定性是主要挑战。

摘要:

粲强子半轻子衰变的缺失使得由夸克级 $c\ o d τ^+ ν_τ$ 跃迁介导的衰变过程不足以探测具有各种狄拉克结构的一般新物理(NP)。为填补这一空白,本文考虑准弹性中微子散射过程 $ν_τ+n\ o τ^-+Λ_c$,并提出通过 $τ$ 轻子和 $Λ_c$ 重子的极化来寻找新物理。在一般低能有效拉格朗日量的框架内,我们对标准模型及各种新物理情景下该过程的(微分)截面和极化矢量进行了全面分析,并仔细审查可能的新物理信号。我们还探讨了 $Λ_c \ o N$ 跃迁形状因子的不确定性和不同参数化对结果的影响,并表明它们已成为通过准弹性散射过程进一步约束可能的新物理的主要挑战之一。

英文摘要:

The absence of semitauonic decays of charmed hadrons makes the decay processes mediated by the quark-level $c\to d τ^+ ν_τ$ transition inadequate for probing a generic new physics (NP) with all kinds of Dirac structures. To fill in this gap, we consider in this paper the quasielastic neutrino scattering process $ν_τ+n\to τ^-+Λ_c$, and propose searching for NP through the polarizations of the $τ$ lepton and the $Λ_c$ baryon. In the framework of a general low-energy effective Lagrangian, we perform a comprehensive analysis of the (differential) cross sections and polarization vectors of the process both within the Standard Model and in various NP scenarios, and scrutinize possible NP signals. We also explore the influence on our findings due to the uncertainties and the different parametrizations of the $Λ_c \to N$ transition form factors, and show that they have become one of the major challenges to further constrain possible NP through the quasielastic scattering process.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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