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arXiv 2203.01965hep-phhep-ex
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用罕见的粲重子衰变进行最佳的BSM搜索

Null test BSM searches with rare charm baryon decays

Marcel Golz, Gudrun Hiller, Tom Magorsch

摘要:

罕见的$\vert Δc \vert=\vert Δu \vert=1$过程在标准模型中以及在上型夸克扇区之外具有独特的探测味道。寻找BSM物理魅力的机会来自于严格的GIM抑制,它杀死了SM对轻子轴矢量贡献的贡献,并抑制了CP破坏。粲强子的半轻子衰变提供了各种干净的零测试观测值,具有新的物理效应,甚至增强了共振贡献。特别是,在三体和自分析四体重子衰变中的角观测量,如$Λ_c\to p \ell^+\ell^-$和$Ξ_c^+\toΣ^+(\to pπ^0)\ell^+\ell^-$,$Ξ_c^0\toΛ^0\,(\to p π^-)\ell^+\ell^-$和$Ω_c^0\toΞ^0\,(\to Λ^{0} π^0)\ell^+\ell^-$,解开了电磁偶极耦合$C_7^{(\prime)}$和(轴向)矢量4-费米子$C^{(\prime)}_{9\,(10)}$中可能的新物理效应。对小至$\sim 0.01$的BSM耦合具有灵敏度。

英文摘要:

Rare $\vert Δc \vert=\vert Δu \vert=1$ processes uniquely probe flavor in the Standard Model and beyond from the up-type quark sector. Opportunities to search for BSM physics in charm arise from the severe GIM suppression which kills SM contributions to leptonic axial-vector contributions and suppresses CP violation. Semileptonic decays of charmed hadrons offer a variety of clean null test observables, featuring new physics effects which are even enhanced by resonance contributions. In particular, angular observables in three- and self-analyzing four-body baryon decays, such as $Λ_c\to p \ell^+\ell^-$ and $Ξ_c^+\toΣ^+(\to pπ^0)\ell^+\ell^-$, $Ξ_c^0\toΛ^0\,(\to p π^-)\ell^+\ell^-$ and $Ω_c^0\toΞ^0\,(\to Λ^{0} π^0)\ell^+\ell^-$ disentangle possible new physics effects in electromagnetic dipole couplings $C_7^{(\prime)}$ and (axial-)vector 4-fermion ones $C^{(\prime)}_{9\,(10)}$. There is sensitivity to BSM couplings as small as $\sim 0.01$.

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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