Lepton Number Violation and Lepton Flavour Violation at LHCb

Adeva, B.

doi:10.1088/1742-6596/447/1/012062

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…However, the extraction of parameters from 0νββ experiments will not be an easy task, due to at least two reasons: firstly, there are large theoretical uncertainties in the estimation of the nuclear matrix elements involved; secondly, there could be cancellations of interfering amplitudes which will not be possible to disentangle without further inputs from other experiments. Therefore, it can be important to have additional ways, such as BaBar [6,7], BELLE [8,9] and LHCb [10,11] studies on rare lepton flavor and lepton number violating decays of heavy mesons [12,13], to discriminate between the Dirac vs. Majorana character of neutrinos.…”

Section: Introductionmentioning

confidence: 99%

Distinguishing Dirac/Majorana sterile neutrinos at the LHC

et al. 2016

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We study the purely leptonic decays of W AE → e AE e AE μ ∓ ν and μ AE μ AE e ∓ ν produced at the LHC, induced by sterile neutrinos with mass m N below M W in the intermediate state. Since the final state neutrino escapes detection, one cannot tell whether this process violates lepton number, which would indicate a Majorana character for the intermediate sterile neutrino. Our study shows that when the sterile neutrino mixings with electrons and muons are different enough, one can still discriminate between the Dirac and Majorana character of this intermediate neutrino by simply counting and comparing the above decay rates. After performing collider simulations and statistical analysis, we find that at the 14 TeV LHC with an integrated luminosity of 3000 fb −1 , for two benchmark scenarios m N ¼ 20 and 50 GeV, at least a 3σ level of exclusion on the Dirac case can be achieved for disparities as mild as, e.g., jU Ne j 2 < 0.7jU Nμ j 2 or jU Nμ j 2 < 0.7jU Ne j 2 , provided that jU Ne j 2 and jU Nμ j 2 are both above ∼2 × 10 −6 .

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Section: Introductionmentioning

confidence: 99%

Distinguishing Dirac/Majorana sterile neutrinos at the LHC

et al. 2016

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“…(Left) Invariant mass distribution of D 0 π + µ − µ − , (right) upper limit as a function of π + µ − mass.The solid line shows the linear fit to the data in the sidebands of B − signal region[7].…”

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confidence: 99%

Majorana Neutrino Searches at the LHCb Experiment

Ossowska¹

2018

Acta Phys. Pol. B

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Signatures of Dirac and Majorana sterile neutrinos in trilepton events at the LHC

2017

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Heavy sterile neutrinos with masses below M W can induce trilepton events at the 14 TeV LHC through purely leptonic W decays of W AE → e AE e AE μ ∓ ν and μ AE μ AE e ∓ ν where the heavy neutrino will be in an intermediate state on its mass shell. Discovery and exclusion limits for the heavy neutrinos are found using both cut-and-count (CC) and multivariate analysis (MVA) methods in this study. We also show that it is possible to discriminate between a Dirac and a Majorana heavy neutrino, even when lepton number conservation cannot be directly tested due to unobservability of the final state neutrino. This discrimination is done by exploiting a combined set of kinematic observables that differ between the Majorana and Dirac cases. We find that the MVA method can greatly enhance the discovery and discrimination limits in comparison with the CC method. For a 14-TeV pp collider with integrated luminosity of 3000 fb −1 , sterile neutrinos can be found with 5σ significance if heavy-to-light neutrino mixings jU Ne j 2 ∼ jU Nμ j 2 ∼ 10 −6 , while the Majorana vs Dirac type can be distinguished if jU Ne j 2 ∼ jU Nμ j 2 ∼ 10 −5 or even jU Nl j 2 ∼ 10 −6 if one of the mixing elements is at least an order of magnitude smaller than the other.

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Lepton Number Violation and Lepton Flavour Violation at LHCb

Cited by 3 publications

References 22 publications

Distinguishing Dirac/Majorana sterile neutrinos at the LHC

Distinguishing Dirac/Majorana sterile neutrinos at the LHC

Majorana Neutrino Searches at the LHCb Experiment

Signatures of Dirac and Majorana sterile neutrinos in trilepton events at the LHC

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