CP violation in rare lepton-number-violating W decays at the LHC

被引：11

作者：

Najafi, Fatemeh ^{[1
]}

Kumar, Jacky ^{[1
]}

London, David ^{[1
]}

机构：

[1] Univ Montreal, Phys Particules, 1375 Ave Therese Lavoie Roux, Montreal, PQ H2V 0B3, Canada

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2021年 / 2021卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Beyond Standard Model; CP violation; Neutrino Physics;

D O I：

10.1007/JHEP04(2021)021

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：

Some models of leptogenesis involve a quasi-degenerate pair of heavy neutrinos N-1,N-2 whose masses can be small, O(GeV). Such neutrinos can contribute to the rare lepton-number-violating (LNV) decay W +/- -> l1 +/- l2 +/- <mml:mfenced close=")" open="(">q ' q<overbar></mml:mover></mml:mfenced><mml:mo>-/+. If both N-1 and N-2 contribute, there can be a CP-violating rate difference between the LNV decay of a W- and its CP-conjugate decay. In this paper, we examine the prospects for measuring such a CP asymmetry ACP at the LHC. We assume a value for the heavy-light neutrino mixing parameter |B-lN|(2) = 10(-5), which is allowed by the present experimental constraints, and consider 5 GeV <= M-N <= 80 GeV. We consider three versions of the LHC - HL-LHC, HE-LHC, FCC-hh - and show that small values of the CP asymmetry can be measured at 3 sigma, in the range 1% less than or similar to A(CP) less than or similar to 15%.

引用

页数：17

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