Probing heavy neutrino oscillations in rare <i>W</i> boson decays

Cvetič, Gorazd; Das, Arindam; Zamora-Saá, Jilberto

doi:10.1088/1361-6471/ab1212

Cited by 54 publications

(60 citation statements)

References 190 publications

(333 reference statements)

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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: 79%

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: 79%

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

et al. 2020

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“…[9,10]. tact interactions [5,[22][23][24]; in W and top decays [24][25][26] as well as via Higgs decays with N decaying leptonically [27].…”

Section: Introductionmentioning

confidence: 99%

Higgs phenomenology as a probe of sterile neutrinos

et al. 2019

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Physics beyond the Standard Model can manifest itself as both new light states and heavy degrees of freedom. In this paper, we assume that the former comprise only a sterile neutrino, N . Therefore, the most agnostic description of the new physics is given by an effective field theory built upon the Standard Model fields as well as N . We show that Higgs phenomenology provides a sensitive and potentially crucial tool to constrain effective gauge interactions of sterile neutrinos, not yet probed by current experiments. In parallel, this motivates a range of new Higgs decay channels with clean signatures as candidates for the next LHC runs, including h → γ + p miss T and h → γγ + p miss T .

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“…The external wave packet model allows one to unambiguously establish the expression for the oscillation phase and check that the entire process remains coherent in all experimentally relevant situations. The present paper does not aim to be a detailed study of HNL oscillations, which have already been covered in various settings and limits in the literature [10,24,29,[41][42][43][44][45]. Therefore, we will only quote the main result.…”

Section: Coherent Oscillations Of Heavy Neutral Leptonsmentioning

confidence: 99%

Dirac vs. Majorana HNLs (and their oscillations) at SHiP

Tastet

Timiryasov

2020

J. High Energ. Phys.

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SHiP is a proposed high-intensity beam dump experiment set to operate at the CERN SPS. It is expected to have an unprecedented sensitivity to a variety of models containing feebly interacting particles, such as Heavy Neutral Leptons (HNLs). Two HNLs or more could successfully explain the observed neutrino masses through the seesaw mechanism. If, in addition, they are quasi-degenerate, they could be responsible for the baryon asymmetry of the Universe. Depending on their mass splitting, HNLs can have very different phenomenologies: they can behave as Majorana fermions-with lepton number violating (LNV) signatures, such as same-sign dilepton decays-or as Dirac fermions with only lepton number conserving (LNC) signatures. In this work, we quantitatively demonstrate that LNV processes can be distinguished from LNC ones at SHiP, using only the angular distribution of the HNL decay products. Accounting for spin correlations in the simulation and using boosted decision trees for discrimination, we show that SHiP will be able to distinguish Majorana-like and Dirac-like HNLs in a significant fraction of the currently unconstrained parameter space. If the mass splitting is of order 10 −6 eV, SHiP could even be capable of resolving HNL oscillations, thus providing a direct measurement of the mass splitting. This analysis highlights the potential of SHiP to not only search for feebly interacting particles, but also perform model selection.

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Probing heavy neutrino oscillations in rare W boson decays

Cited by 54 publications

References 190 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

Higgs phenomenology as a probe of sterile neutrinos

Dirac vs. Majorana HNLs (and their oscillations) at SHiP

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