A tale of invisibility: constraints on new physics in b → sνν

被引：24

作者：

Felkl, Tobias ^{[1
]}

Li, Sze Lok ^{[1
]}

Schmidt, Michael A. ^{[1
]}

机构：

[1] Univ New South Wales, Sch Phys, Sydney Consortium Particle Phys & Cosmol, Sydney, NSW 2052, Australia

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2021年 / 2021卷 / 12期

基金：

澳大利亚研究理事会;

关键词：

Beyond Standard Model; Heavy Quark Physics; Neutrino Physics; TOP-QUARK; RARE; DECAYS;

D O I：

10.1007/JHEP12(2021)118

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The Belle II experiment will measure the rare decays B -> K nu nu and B -> K*nu nu with increased sensitivity which can hence be expected to serve as a very efficient probe of new physics. We calculate the relevant branching ratios in low-energy effective field theory (LEFT) including an arbitrary number of massive sterile neutrinos and discuss the expected sensitivity to the different operators. We also take into account the longitudinal polarisation fraction F-L and the inclusive decay rate B -> X-s nu nu. In our investigation we consider new physics dominantly contributing to one and two operators both for massless and massive (sterile) neutrinos. Our results show a powerful interplay of the exclusive decay rates B -> K nu nu and B -> K*nu nu, and a surprisingly large sensitivity of the inclusive decay mode to vector operators even under conservative assumptions about its uncertainty. Furthermore, the sensitivity of F-L is competitive with the branching ratio of B -> K*nu nu in the search for new physics contributing to scalar operators and thus also complementary to B -> K nu nu and B -> X-s nu nu.

引用

页数：40

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