发表机构
Deutsches Elektronen-Synchrotron DESY; Johannes Gutenberg University（德国电子同步加速器; 约翰内斯·古腾堡大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究基于NA62合作组对$K^+\to\pi^+\nu\bar\nu$分支比的新测量，在标准模型偏差源于修改$Z$耦合或半轻子相互作用效应假设下，探讨其对相关可观测量的影响及对尚未测量的$K_L\to\pi^0\nu\bar\nu$模式的意义。
AI 中文摘要
NA62合作组对$K^+\to\pi^+\nu\bar\nu$分支比的新测量是精确味物理的重要里程碑。在不同超出标准模型物理的味假设下，此衰变模式可与许多其他具有潜在味改变流的可观测量相关，如$B\to K\nu\bar\nu$或$B_s\to\mu\mu$。我们研究了在标准模型偏差源于修改后的$Z$耦合或半轻子相互作用效应假设下新结果的影响。最后回顾了这些情形对尚未测量的伙伴模式$K_L\to\pi^0\nu\bar\nu$的意义。
英文摘要
The new measurement of the $K^+\toπ^+ν\barν$ branching ratio by the NA62 collaboration represents an important milestone in precision flavour physics. Under different flavour assumptions on beyond the standard model physics, this decay mode can be related to many other observables with underlying flavour-changing currents, such as $B\to Kν\barν$ or $B_s\toμμ$, effectively providing an additional handle in our exploration of flavour-violating new physics effects. We study the impact of this new result, under the hypotheses that deviations from the standard model arise from modified $Z$ couplings, or from effects in semileptonic interactions. Finally, we review the implications of our scenarios for the yet to be measured partner mode $K_L\toπ^0ν\barν$.
Comments16 pages, 5 figures. Version accepted in EPJC
