论文标题
零测试BSM搜索具有稀有魅力baryon衰减
Null test BSM searches with rare charm baryon decays
论文作者
论文摘要
稀有$ \vertΔC\ vert = \vertΔU\ vert = 1 $在标准模型中及以上的Quark sector中的唯一探针风味。在魅力中寻找BSM物理学的机会是由于严重的GIM抑制而产生的，该抑制杀死了SM对Leptonic轴向载体贡献的贡献并抑制了CP违规。诱人的Hadron的半衰减衰减提供了各种干净的无效测试可观察物，具有新的物理效果，甚至通过共鸣贡献增强了物理效果。特别是，在三体和自我分析的四体bary子中可观察到的角度，例如$λ_c\ to p \ ell^+\ ell^ - $和$ξ_c^+\toς^+（\topπ^0） π^ - ）\ ell^+\ ell^ - $和$ω_c^0 \toξ^0 \，（（\ toλ^{0}π^0）\ ell^+el^+el^+el^ - $ destangle可能在电气磁性dipole-dipole couplings $ c_7^primice $ c_7^prime（\ prime）中可能在电气磁性dipole dipole dipole dipole diperangle中效应$ c^{（\ prime）} _ {9 \，（10）} $。对BSM耦合的敏感性小至$ \ sim 0.01 $。
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 $\sim 0.01$.
