Probing third-generation New Physics with K- nvv and B- K(*)vv

被引：0
|
作者：
Allwicher, L. [1 ]
Bordone, M. [2 ]
Isidori, G. [1 ]
Piazza, G. [1 ]
Stanzione, A. [3 ,4 ]
机构：
[1] Univ Zurich, Phys Inst, CH-8057 Zurich, Switzerland
[2] CERN, Theoret Phys Dept, Geneva, Switzerland
[3] SISSA, Sez Trieste, INFN, via Bonomea 265, I-34136 Sissa, Trieste, Italy
[4] SISSA Int Sch Adv Studies, Via Bonomea 265, I-34136 Trieste, Italy
来源：
PHYSICS LETTERS B | 2025年 / 861卷
基金：
瑞士国家科学基金会;
关键词：
CB-VERTICAL-BAR; R(D-ASTERISK); ANOMALIES; DSIXTOOLS; DECAYS;
D O I：
10.1016/j.physletb.2025.139295
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The recent observation of the K+-n+vv decay by NA62 is an important milestone in precision flavor physics. Together with evidence of B+- K+vv reported by Belle-II, they are the only FCNC decays involving third-family leptons where a precision close to the SM expectation has been reached. We study the implications of these recent results in the context of a new physics scenario aligned to the third generation, with an approximate U(2)5 flavor symmetry acting on the light families. We find that the slight excess observed in both channels supports the hypothesis of non-standard TeV dynamics of this type, as also hinted at by other B-meson decays, consistently with bounds from colliders and electroweak observables. We further discuss how future improvements in precision could affect this picture, highlighting the discovery potential in these di-neutrino modes.
引用
收藏
页数：8
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