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We inspect the model-independent study of practical Dirac Majorana confusion theorem (pDMCT) -- a wide spread belief that the difference between Dirac and Majorana neutrinos via any kinematical observable would be practically impossible to…

High Energy Physics - Phenomenology · Physics 2024-08-27 C. S. Kim

The ``Practical Dirac-Majorana Confusion Theorem'' (PDMCT) asserts that phenomenological differences between Dirac and Majorana neutrinos are suppressed by $(m_\nu/E)^2$ in lepton-number-conserving processes, such that at high energy, it is…

High Energy Physics - Phenomenology · Physics 2026-02-26 David Delepine , A. Yebra

In a recent article arXiv:2402.05172 [hep-ph], the authors discuss the question "whether quantum statistics can help distinguish between Dirac and Majorana neutrinos." The paper contains, among other things, an unsubstantiated critique of…

High Energy Physics - Phenomenology · Physics 2024-03-08 C. S. Kim , M. V. N. Murthy , Dibyakrupa Sahoo

(abridged) The physical mechanisms that make a neutrino with standard-model (SM) weak interactions a "lepton-number conservation (LNC) violating" neutrino such as the Majorana neutrino are analysed in a basis of two Majorana states that…

High Energy Physics - Phenomenology · Physics 2012-12-17 R. Plaga

The nature of a neutrino, whether it is a Dirac type or Majorana type, may be comprehensively probed using their quantum statistical properties. If the neutrino is a Majorana fermion, then by definition it is identical and indistinguishable…

High Energy Physics - Phenomenology · Physics 2022-07-05 C. S. Kim , M. V. N. Murthy , Dibyakrupa Sahoo

Neutrinos are the only known elementary fermions that can exhibit Majorana nature. As per the "practical Dirac-Majorana confusion theorem" it is impossible to distinguish between Dirac and Majorana neutrinos via any kinematic tests when…

High Energy Physics - Phenomenology · Physics 2017-10-05 C. S. Kim , Dibyakrupa Sahoo

Neutrino oscillations have become well-known phenomenon; the measurements of neutrino mixing angles and mass squared differences are continuously improving. Future oscillation experiments will eventually determine the remaining unknown…

High Energy Physics - Phenomenology · Physics 2015-09-30 O. G. Miranda , H. Nunokawa

Finding out if neutrinos are Dirac or Majorana particles is known to be extremely difficult due to the smallness of neutrino mass and the fact that in the limit $m_\nu=0$ both Dirac and Majorana neutrinos become Weyl particles, i.e. are…

High Energy Physics - Phenomenology · Physics 2024-03-04 Evgeny Akhmedov , Andreas Trautner

We study decoherence effects on mixing among three generations of neutrinos. We show that in presence of a non--diagonal dissipation matrix, both Dirac and Majorana neutrinos can violate the $CPT$ symmetry and the oscillation formulae…

High Energy Physics - Phenomenology · Physics 2020-12-02 Luca Buoninfante , Antonio Capolupo , Salvatore M. Giampaolo , Gaetano Lambiase

We analyse the possibility of distinguishing Dirac and Majorana neutrinos in future neutrino factory experiments in which neutrinos are produced in muon decay when, in addition to a vector type as in the SM, there are also scalar…

High Energy Physics - Phenomenology · Physics 2015-06-11 Robert Szafron , Marek Zralek

We analyze many aspects of the phenomenon of the decoherence for neutrinos propagating in long baseline experiments. We show that, in the presence of an off-diagonal term in the dissipative matrix, the Majorana neutrino can violate the CP T…

High Energy Physics - Phenomenology · Physics 2019-05-22 A. Capolupo , S. M. Giampaolo , G. Lambiase

A novel method to differentiate the effects of Dirac and Majorana (D-M) neutrinos in four-body decays has been discussed in arXiv:2106.11785. There, it is concluded that the back-to-back kinematic scenario seems to avoid the constraint…

High Energy Physics - Phenomenology · Physics 2024-02-09 Juan Manuel Márquez , Diego Portillo-Sánchez , Pablo Roig

Some of the outstanding questions of particle physics today concern the neutrino sector, in particular whether there are more neutrinos than those already known and whether they are Dirac or Majorana particles.There are different ways to…

High Energy Physics - Phenomenology · Physics 2015-05-27 Gorazd Cvetic , Claudio Dib , C. S. Kim , Jilberto Zamora-Saa

Charged currents are probed in low-energy precision $\beta$-decay experiments and at high-energy colliders, both of which aim to measure or constrain signals of beyond-the-Standard-Model physics. In light of future $\beta$-decay and LHC…

High Energy Physics - Phenomenology · Physics 2021-12-07 Wouter Dekens , Jordy de Vries , Tom Tong

Normal muon decay, $\mu^{+} \to e^{+}\nu_{e}\bar{\nu_{\mu}}$, is studied as a tool to discriminate between the Dirac and Majorana types of neutrinos and to survey the structure of the weak interaction. It is assumed that massive neutrinos…

High Energy Physics - Phenomenology · Physics 2009-11-11 Masaru Doi , Tsuneyuki Kotani , Hiroyuki Nishiura

Recently, there has been interest in the applicability of quantum statistics to distinguish Dirac from Majorana neutrinos in multi-neutrino final states. In particular, debate has arisen over the validity of the Dirac-Majorana confusion…

High Energy Physics - Phenomenology · Physics 2025-07-11 Innes Bigaran , Stephen J. Parke , Pedro Pasquini

Nonzero neutrino masses imply the existence of degrees of freedom and interactions beyond those in the Standard Model. A powerful indicator of what these might be is the nature of the massive neutrinos: Dirac fermions versus Majorana…

High Energy Physics - Phenomenology · Physics 2021-08-12 André de Gouvêa , Patrick J. Fox , Boris J. Kayser , Kevin J. Kelly

Neutrinoless double beta decay pops up almost in any extension of the standard model. It is perhaps the only process, which can unambiguously determine whether the massive neutrinos are Majorana or Dirac type particles. In addition from the…

High Energy Physics - Phenomenology · Physics 2009-11-10 J. D. Vergados

The nature of neutrino mass -- whether neutrinos are Dirac or Majorana particles -- remains one of the central open questions in particle physics. While observation of neutrinoless double beta decay would confirm the Majorana case, the…

High Energy Physics - Phenomenology · Physics 2025-09-22 Mitrajyoti Ghosh , Kevin Liguori , Takemichi Okui , Kohsaku Tobioka

We discuss the possibility to distinguish between Dirac and Majorana neutrinos in the context of the minimal gauge theory for neutrino masses, the B-L gauge extension of the Standard Model. We revisit the possibility to observe lepton…

High Energy Physics - Phenomenology · Physics 2020-07-22 Pavel Fileviez Perez , Alexis D. Plascencia
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