The seesaw path to leptonic CP violation

Caputo, Andrea; Hernández, P.; Kekic, M.; López‐Pavón, Jacobo; Salvadó, Jordi

doi:10.1140/epjc/s10052-017-4823-8

Cited by 43 publications

(49 citation statements)

References 33 publications

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“…That is, they can be expressed in terms of the low energy parameters in U ν alone. On one hand, this in principle allows one to determine the Majorana phase α from measurements of the U 2 a [87]. On the other hand this means that existing neutrino oscillation data can be used to make predictions for the allowed range of U 2 a /U 2 in the minimal seesaw model.…”

Section: Jhep07(2018)105mentioning

confidence: 99%

NA62 sensitivity to heavy neutral leptons in the low scale seesaw model

Drewes¹,

Hajer²,

Klarić³

et al. 2018

J. High Energ. Phys.

104

129

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The sensitivity of beam dump experiments to heavy neutral leptons depends on the relative strength of their couplings to individual lepton flavours in the Standard Model. We study the impact of present neutrino oscillation data on these couplings in the minimal type I seesaw model and find that it significantly constrains the allowed heavy neutrino flavour mixing patterns. We estimate the effect that the DUNE experiment will have on these predictions. We then discuss implication that this has for the sensitivity of the NA62 experiment when operated in the beam dump mode and provide sensitivity estimates for different benchmark scenarios. We find that the sensitivity can vary by almost two orders of magnitude for general choices of the model parameters, but depends only weakly on the flavour mixing pattern within the parameter range that is preferred by neutrino oscillation data.

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Section: Jhep07(2018)105mentioning

confidence: 99%

NA62 sensitivity to heavy neutral leptons in the low scale seesaw model

Drewes¹,

Hajer²,

Klarić³

et al. 2018

J. High Energ. Phys.

104

129

View full text Add to dashboard Cite

show abstract

“…Further improvement could be achieved with additional detectors [24][25][26]. In the future, a lepton collider could offer an ideal tool to search for heavy neutrinos with masses below the W mass [27][28][29][30][31][32][33][34][35][36]. Searches at smaller masses M i < 5 GeV are preformed at the NA62 experiment [37][38][39] as well as at T2K [40], and in the future at SHiP [31,41].…”

Section: Introductionmentioning

confidence: 99%

Low-scale leptogenesis with three heavy neutrinos

Abada

Arcadi

Domcke

et al. 2019

J. High Energ. Phys.

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Leptogenesis induced by the oscillations of GeV-scale neutrinos provides a minimal and testable explanation of the baryon asymmetry of the Universe. In this work we extend previous studies invoking only two heavy neutrinos to the case of three heavy neutrinos. We find qualitatively new behaviour as a result of lepton number violating oscillations and decays, strong flavour effects in the washout and a resonant enhancement due to matter effects. An approximate global B −L symmetry (representing the difference of baryon and a generalised lepton number) can protect the light neutrino masses from large radiative corrections, while simultaneously providing the ingredients for the resonant enhancement of the lepton asymmetry due to thermal contributions to the heavy neutrino dispersion relations. This mechanism is particularly efficient for large heavy neutrino mixing angles near the current experimental limits, a regime in which leptogenesis is not feasible in the minimal scenario with two heavy neutrinos. In this new parameter regime, low-scale leptogenesis is testable by the LHC and other existing experiments.

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“…A number of other constraints on the active-sterile mixing have been obtained from peak searches, pion decays, collider searches etc. A variety of choices of the heavy neutrino mass have been made in different articles [29,30,32,37,[88][89][90][91][92][93][94][95][96][97][98][99][100][101][102], which discussed the limits on the heavy neutrino mass and mixing. We summarize the existing limits from these articles.…”

Section: Combined Sensitivity Reach From Meson Decays and Com-parisonmentioning

confidence: 99%

Sensitivity of lepton number violating meson decays in different experiments

et al. 2019

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We study the discovery prospect of different three body lepton number violating (LNV) meson decays M − 1 → − 1 − 2 M + 2 in the framework of right handed (RH) neutrino extended Standard Model (SM). We consider a number of ongoing experiments, such as, NA62 and LHCb at CERN, Belle II at SuperKEK, as well as at the proposed future experiments, SHiP, MATHUSLA and FCCee. The RH Majorana neutrino N mediating these meson decays provides a resonant enhancement of the rates, if the mass of N lies in the range (100 MeV − 6 GeV). We consider the effect of parent mesons velocity, as well as, the effect of finite detector size. Using the expected upper limits on the number of events for the LNV decay modes, M − 1 → − 1 − 2 π + (M 1 = B, B c , D, D s and K), we analyze the sensitivity reach of the mixing angles |V eN | 2 , |V µN | 2 , |V τ N | 2 , |V eN V µN |, |V eN V τ N | and |V µN V τ N | as a function of heavy neutrino mass M N . We show that, inclusion of parent meson velocity can account to a large difference for active-sterile mixing, specially for D, D s meson decay at SHiP and K meson decay at NA62. Taking into account the velocity of the D s meson, the future beam dump experiment SHiP can probe |V eN | 2 ∼ 10 −9 . For RH neutrino mass in between 2 -5 GeV, MATHUSLA can provide best sensitivity reach of active-sterile mixings. 1 − 2 π + [ [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63]. For RH neutrino search, this process has an advantage as compared to the LNV 0νββ-decay due to the lesser uncertainties in the meson decay constant.In the later process, the nuclear matrix elements (NME) uncertainty can make difference in the prediction of active-sterile mixing. We consider a number of three body ∆L = 2 mesonD, D s and K) and derive sensitivity reach of the activesterile mixing parameter in a number of ongoing and future experiments, such as, NA62, LHCb at CERN, Belle II, SHiP, MATHUSLA and FCC-ee. Note that, the light neutrino contribution to these meson decays are extremely suppressed. However, for RH neutrinos in the mass range of 0.140 GeV < M N < 6 GeV, the intermediate Majorana neutrinos can be produced on-shell. This results in resonant enhancement of these decay rates. In addition, large number of decaying mesons in these experiments, in-particular at SHiP will facilitateto improve the sensitivity reach significantly. In deriving these results, we consider parent meson velocity, that affects the probability of RH neutrino decay inside the detector. We show, that inclusion of parent meson velocity can give one or two orders of magnitude shift O(10 1 − 10 2 ) in the results obtained.The paper is organized as follows. In sec. 2, we very briefly review the basic features of the three RH neutrino framework, following which in sec. 3, we discuss in detail the contributions of the RH neutrino in meson decays. In sec. 4, we then compute the total decay width of RH neutrino N in the mass range 0.140 GeV ≤ M N ≤ 6 GeV. In sec. 5, we study the effects of parent meson velocity in the RH neutrino decay probabi...

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The seesaw path to leptonic CP violation

Cited by 43 publications

References 33 publications

NA62 sensitivity to heavy neutral leptons in the low scale seesaw model

NA62 sensitivity to heavy neutral leptons in the low scale seesaw model

Low-scale leptogenesis with three heavy neutrinos

Sensitivity of lepton number violating meson decays in different experiments

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