Displaced vertices as probes of sterile neutrino mixing at the LHC

Cottin, G.; Helo, Juan Carlos; Hirsch, Martin

doi:10.1103/physrevd.98.035012

Cited by 80 publications

(100 citation statements)

References 51 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: 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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“…In Ref. [27], an updated limit in the case where the SM is extended with only one right-handed neutrino produced in the decay of W boson excludes values above 10 −7 . We will show in the next section that strategies presented in this work are more stringent than all of these constraints.…”

Section: The Modelmentioning

confidence: 99%

“…Cuts for the ATLAS 1DV ID proposed search. These are optimized as in Ref [27],. and are inspired by the ATLAS search[60].…”

mentioning

confidence: 99%

Displaced heavy neutrinos from Z′ decays at the LHC

Chiang

Cottin

Das

et al. 2019

J. High Energ. Phys.

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We study the LHC sensitivity to probe a long-lived heavy neutrino N in the context of Z models.We focus on displaced vertex signatures of N when pair produced via a Z , decaying to leptons and jets inside the inner trackers of the LHC experiments. We explore the LHC reach with current longlived particle search strategies for either one or two displaced vertices in association with hadronic tracks or jets. We focus on two well-motivated models, namely, the minimal U (1) B−L scenario and its U (1) X extension. We find that searches for at least one displaced vertex can cover a significant portion of the parameter space, with light-heavy neutrino mixings as low as |V lN | 2 ≈ 10 −17 , and l = e, µ accessible across GeV scale heavy neutrino masses.

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“…Refs. [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] in the context of minimal seesaw and [63][64][65][66][67] in the context of U (1) B−L . For recent LHC searches relevant for long-lived RHNs decaying into final states containing two leptons, see Refs.…”

Section: Introductionmentioning

confidence: 99%

Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) model

2019

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A gauged U (1) X extension of the Standard Model is a simple and consistent framework to naturally incorporate three right-handed neutrinos (RHNs) for generating the observed light neutrino masses and mixing by the type-I seesaw mechanism. We examine the collider testability of the U (1) X model, both in its minimal form with the conventional charges, as well as with an alternative charge assignment, via the resonant production of the U (1) X gauge boson (Z ) and its subsequent decay into a pair of RHNs. We first derive an updated upper limit on the new gauge coupling g X as a function of the Z -boson mass from the latest LHC dilepton searches. Then we identify the maximum possible cross section for the RHN pair-production under these constraints. Finally, we investigate the possibility of having one of the RHNs long-lived, even for a TeV-scale mass. Employing the general parametrization for the light neutrino mass matrix to reproduce the observed neutrino oscillation data, we perform a parameter scan and find a simple formula for the maximum RHN lifetime as a function of the lightest neutrino mass eigenvalue (m lightest ). We find that for m lightest 10 −5 eV, one of the RHNs in the minimal U (1) X scenario can be long-lived with a displaced-vertex signature which can be searched for at the LHC and/or with a dedicated longlived particle detector, such as MATHUSLA. In other words, once a long-lived RHN is observed, we can set an upper bound on the lightest neutrino mass in this model.

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Displaced vertices as probes of sterile neutrino mixing at the LHC

Cited by 80 publications

References 51 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

Displaced heavy neutrinos from Z′ decays at the LHC

Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) model

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