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arXiv 2011.09551hep-phhep-ex
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摩擦玻色子末态中的轻夸克Yukawas

Light quark Yukawas in triboson final states

Adam Falkowski, Sanmay Ganguly, Phillippe Gras, Jose Miguel No, Kohsaku Tobioka, Natascia Vignaroli, Tevong You

摘要:

三重矢量玻色子产生,$p p \to VVV$ $(V = W, Z)$,最近首次被观察到。我们建议,这个过程的精确测量提供了一个很好的探针的第一代轻夸克汤川耦合。在这一过程中,修改的夸克与离壳层希格斯粒子的相互作用导致部分子截面随能量的快速增长,这表现在末态轻子和夸克的增强的$p_T$分布。我们量化这种影响,并估计现在和未来的2 $σ$的敏感性向上,向下,和奇怪的Yukawas。特别是,我们发现HL-LHC可以达到$\mathcal{O}(400)$灵敏度下降汤川相对于标准模型的值,提高电流灵敏度在这个过程中的一个因素$10$,并可以进一步提高到$\mathcal{O}(30)$在FCC-hh。这与第一代Yukawas的全局拟合和其他壳上探针的约束是竞争性的,也是互补的。在HL-LHC的摩擦玻色子灵敏度对应于探测维度-6 SMEFT运营商抑制的$\mathcal{O}(1)$ TeV规模,类似于其他LHC希格斯探针。

英文摘要:

Triple heavy vector boson production, $p p \to VVV$ $(V = W, Z)$, has recently been observed for the first time. We propose that precision measurements of this process provide an excellent probe of the first generation light quark Yukawa couplings. Modified quark interactions with the off-shell Higgs in this process lead to a rapid growth of the partonic cross sections with energy, which manifests in an enhanced $p_T$ distribution of the final state leptons and quarks. We quantify this effect and estimate the present and future 2$σ$ sensitivity to the up, down, and strange Yukawas. In particular, we find that HL-LHC can reach $\mathcal{O}(400)$ sensitivity to the down Yukawa relative to the Standard Model value, improving the current sensitivity in this process by a factor of $10$, and which can be further improved to $\mathcal{O}(30)$ at FCC-hh. This is competitive with and complementary to constraints from global fits and other on-shell probes of the first generation Yukawas. The triboson sensitivity at HL-LHC corresponds to probing dimension-6 SMEFT operators suppressed by an $\mathcal{O}(1)$ TeV scale, similarly to other LHC Higgs probes.

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