Cabibbo angle anomalies and oblique corrections: The remarkable role of the vectorlike quark doublet

被引：16

作者：

Belfatto, Benedetta ^{[1
,2
]}

Trifinopoulos, Sokratis ^{[3
]}

机构：

[1] SISSA, Int Sch Adv Studies, Via Bonomea 265, I-34136 Trieste, Italy

[2] INFN, Sez Trieste, Via Bonomea 265, I-34136 Trieste, Italy

[3] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW D | 2023年 / 108卷 / 03期

基金：

瑞士国家科学基金会;

关键词：

STRONG CP-PROBLEM; WEAK MIXING ANGLES; NEUTRON LIFETIME; HORIZONTAL SYMMETRY; ULTRACOLD NEUTRONS; UNIVERSAL SEESAW; FAMILY SYMMETRY; MASS; FLAVOR; SINGLET;

D O I：

10.1103/PhysRevD.108.035022

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The combination of precise determinations of Vus and Vud hints toward a violation of the CabibboKobayashi-Maskawa matrix first row unitarity at about 3 & sigma; level. Conversely, the recent measurement of the W-boson mass by the CDF Collaboration exhibits significant tension with the Standard Model prediction, intensifying the conflict that may arise in models addressing the unitarity violation. We demonstrate that one vectorlike SU(2)L doublet with mass of a few TeV mixing with light quarks and the top quark can simultaneously account for the two anomalies, without conflicting with flavor-changing phenomena and electroweak observables. Moreover, another tension in the value of the Cabibbo angle is also reported at the 3 & sigma; level, between two determinations of Vus obtained from semileptonic Kt & DEG;3 and leptonic K & mu;2 kaon decays. We show that the vectorlike doublet can be at the origin of this discrepancy and the substantial positive shift in the W-boson mass. This unique feature of the vectorlike quark doublet may render it a crucial puzzle piece in new physics scenarios addressing the Cabibbo-Kobayashi-Maskawa matrix unitarity problem. The model can be potentially probed in future colliders.

引用

页数：24

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