Measuring the heavy neutrino oscillations in rare W boson decays at the Large Hadron Collider

Cvetič, Gorazd; Das, Arindam; Araya, S. Tapia; Saa, J. A. Zamora

doi:10.1088/1361-6471/ab4ee8

Cited by 23 publications

(18 citation statements)

References 81 publications

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“…For heavy neutrinos that are produced in W boson decays, the sensitivity is only marginally increased when lowering trigger thresholds, i.e., point iii), because most µ ± from the primary vertex have p T > 25 GeV due to the mass of the W boson. It remains well below what can be achieved in proton collisions at the LHC [76,[78][79][80][81][83][84][85][86][87][88][89][90][91][92].…”

Section: Resultsmentioning

confidence: 78%

New long-lived particle searches in heavy-ion collisions at the LHC

et al. 2020

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We show that heavy ion collisions at the LHC provide a promising environment to search for signatures with displaced vertices in well-motivated New Physics scenarios. Compared to proton collisions, they offer several advantages, i) the number of parton level interactions per collision is larger, ii) there is no pile-up, iii) the lower instantaneous luminosity compared to proton collisions allows to operate the LHC experiments with very loose triggers, and iv) there are new production mechanisms that are absent in proton collisions. In the present work we focus on the third point and show that the modification of the triggers alone can increase the number of observable events by orders of magnitude if the long lived particles are predominantly produced with low transverse momentum. Our results show that collisions of ions lighter than lead are well-motivated from the viewpoint of searches for New Physics. We illustrate this for the example of heavy neutrinos in the Neutrino Minimal Standard Model.

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Section: Resultsmentioning

confidence: 78%

New long-lived particle searches in heavy-ion collisions at the LHC

et al. 2020

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“…In this case the experimentally relevant mixing is U 2 a , the magnitude of which is controlled by the large entries F a . Heavy neutrino oscillations in the detector [58][59][60][61][62][63][64][65][66][67] could provide an indirect way to access the small mass splitting and phenomenologically study this specific case. considered here the upper limit comes from the experimental constraints, while for larger masses there is a theoretical bound U 2 α I < 4π(n − 1)(v/M) 2 from the requirement that the Yukawa couplings remain perturbative [7].…”

Section: The Symmetry Protected Scenariomentioning

confidence: 99%

A Frequentist analysis of three right-handed neutrinos with GAMBIT

et al. 2020

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The extension of the Standard Model by righthanded neutrinos can not only explain the active neutrino masses via the seesaw mechanism, it is also able solve a number of long standing problems in cosmology. Especially, masses below the TeV scale are of particular interest as they can lead to a plethora of signatures in experimental searches. We present the first full frequentist analysis of the extension of the Standard Model by three right-handed neutrinos, with masses between 60 MeV and 500 GeV, using the Global and Modular BSM (beyond the Standard Model) Inference Tool GAMBIT. Our analysis is based on the Casas-Ibarra parametrisation and includes a large range of experimental constraints: active neutrino mixing, indirect constraints from, e.g., electroweak precision observables and lepton universality, and numerous direct searches for right-handed neutrinos. To study their overall effect, we derive combined profile likelihood results for the phenomenologically most relevant parameter projections. Furthermore, we discuss the role of (marginally) statistically preferred regions in the parameter space. Finally, we explore the flavour mixing pattern of the three right-handed neutrinos for different values of the lightest neutrino mass. Our results comprise the most comprehensive assessment of the model with three right-handed neutrinos model below the TeV scale so far, and provide a robust ground for exploring the impact of future constraints or detections.

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“…The search for the CP violation has been studied in different scenarios: resonant (overlap) scattering processes [95][96][97], resonant leptonic [98][99][100] and semileptonic rare meson decays [99,101,102], as well as B mesons, W bosons and τ decays that include heavy neutrinos oscillation [60,[103][104][105][106][107][108][109]. The resonant (overlap) effect comes from the interference between two almost degenerate neutrino mass eigenstates with masses of order ∼ GeV.…”

Section: (): V-volmentioning

confidence: 99%

Exploring CP-violation, via heavy neutrino oscillations, in rare B meson decays at Belle II

et al. 2020

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In this article we study the rare B-meson decay via two on-shell almost-degenerate Majorana Heavy Neutrinos, into two charged leptons and two pseudoscalar mesons ($$B^{\pm } \rightarrow D^0 \ell ^{\pm }_1 \ell ^{\pm }_2 \pi ^{\mp }$$ B ± → D 0 ℓ 1 ± ℓ 2 ± π ∓ ). We consider the scenario where the heavy neutrino masses are $$\sim 2$$ ∼ 2 GeV and the heavy-light mixing coefficients are $$|B_{\ell N}|^2 \sim 10^{-5}$$ | B ℓ N | 2 ∼ 10 - 5 , and evaluate the possibility to measure the CP-asymmetry at Belle II. We present some realistic conditions under which the asymmetry could be detected.

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Measuring the heavy neutrino oscillations in rare W boson decays at the Large Hadron Collider

Cited by 23 publications

References 81 publications

New long-lived particle searches in heavy-ion collisions at the LHC

New long-lived particle searches in heavy-ion collisions at the LHC

A Frequentist analysis of three right-handed neutrinos with GAMBIT

Exploring CP-violation, via heavy neutrino oscillations, in rare B meson decays at Belle II

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