Support of evidence for neutrinoless double beta decay

Klapdor‐Kleingrothaus, H. V.; Dietz, A.; Krivosheina, I. V.; Dörr, C.; Tomei, C.

doi:10.1016/j.physletb.2003.06.067

Cited by 35 publications

(29 citation statements)

References 25 publications

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“…After decades of pioneering work, the Heidelberg-Moscow (HM) collaboration has, in the last few years, presented first experimental evidence -or, as some may prefer to say, tantalizing hints -for a Majorana particle. The initial 3-σ signal now has better than 4-σ significance [34][35][36][37]. The field Ψ(x) carries mass dimension three-halves.…”

Section: Genesis: From the Majorana Field To A Call For A New Dark Mamentioning

confidence: 97%

Spin-half fermions with mass dimension one: theory, phenomenology, and dark matter

Ahluwalia

Grumiller

2005

J. Cosmol. Astropart. Phys.

182

260

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Abstract:We provide the first details on the unexpected theoretical discovery of a spinone-half matter field with mass dimension one. It is based upon a complete set of dualhelicity eigenspinors of the charge conjugation operator. Due to its unusual properties with respect to charge conjugation and parity, it belongs to a non-standard Wigner class. Consequently, the theory exhibits non-locality with (CP T ) 2 = −I. We briefly discuss its relevance to the cosmological 'horizon problem'. Because the introduced fermionic field is endowed with mass dimension one, it can carry a quartic self-interaction. Its dominant interaction with known forms of matter is via Higgs, and with gravity. This aspect leads us to contemplate the new fermion as a prime dark matter candidate. Taking this suggestion seriously we study a supernova-like explosion of a galactic-mass dark matter cloud to set limits on the mass of the new particle and present a calculation on relic abundance to constrain the relevant cross-section. The analysis favours light mass (roughly 20 MeV) and relevant cross-section of about 2 pb. Similarities and differences with the WIMP and mirror matter proposals for dark matter are enumerated. In a critique of the theory we bare a hint on non-commutative aspects of spacetime, and energy-momentum space.Keywords: dark matter, quantum field theory on curved space.To celebrate the birthday of my wife Dr I S Ahluwalia-Khalilova and in memory of my father Shri B S Ahluwalia (1933-1977

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Section: Genesis: From the Majorana Field To A Call For A New Dark Mamentioning

confidence: 97%

Spin-half fermions with mass dimension one: theory, phenomenology, and dark matter

Ahluwalia

Grumiller

2005

J. Cosmol. Astropart. Phys.

182

260

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“…One reason is that the most conservative bound on neutrino mass, coming from the tritium beta decay experiments, reads m ν < 2.2 eV (at the 2σ level) [49,50], that is quite higher than the value of 0.3 eV quoted above. The main evidences for a neutrino mass in the sub-eV range come, in the field of particle physics, from the experiments on neutrinoless double beta decay [51,52], whose interpretation depends on assumptions about the Majorana nature of neutrinos and on the details of the mixing matrix. Other indications of a sub-eV mass come, as stated above, from cosmology and in particular from the power spectrum of anisotropies, but since we want to keep our results as much as possible independent from other analyses, we should not use information on neutrino mass derived from the previous analyses of the CMB data.…”

Section: Motivation For This Workmentioning

confidence: 99%

Joint constraints on the lepton asymmetry of the Universe and neutrino mass from the Wilkinson Microwave Anisotropy Probe

2005

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We use the Wilkinson Microwave Anisotropy Probe (WMAP) data on the spectrum of cosmic microwave background anisotropies to put constraints on the present amount of lepton asymmetry L, parameterized by the dimensionless chemical potential (also called degeneracy parameter) ξ and on the effective number of relativistic particle species. We assume a flat cosmological model with three thermally distributed neutrino species having all the same mass and chemical potential, plus an additional amount of effectively massless exotic particle species. The extra energy density associated to these species is parameterized through an effective number of additional species ∆N eff others . We find that 0 < |ξ| < 1.1 and correspondingly 0 < |L| < 0.9 at 2σ, so that WMAP data alone cannot firmly rule out scenarios with a large lepton number; moreover, a small preference for this kind of scenarios is actually found. We also discuss the effect of the asymmetry on the estimation of other parameters and in particular of the neutrino mass. In the case of perfect lepton symmetry, we obtain the standard results. When the amount of asymmetry is left free, we find mν < 3.6 eV at 2σ. Finally we study how the determination of |L| is affected by the assumptions on ∆N eff others . We find that lower values of the extra energy density allow for larger values of the lepton asymmetry, effectively ruling out, at 2σ level, lepton symmetric models with ∆N eff others ≃ 0.

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“…25 yrs [16,17]. If this is confirmed, the next generation will collect sufficient statistics for a precision half-life measurement.…”

Section: Experimental Statusmentioning

confidence: 91%

Neutrinoless Double Beta Decay

Zuber¹

2008

Neutrinos in Particle Physics, Astrophysics and Cosmology

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Support of evidence for neutrinoless double beta decay

Cited by 35 publications

References 25 publications

Spin-half fermions with mass dimension one: theory, phenomenology, and dark matter

Spin-half fermions with mass dimension one: theory, phenomenology, and dark matter

Joint constraints on the lepton asymmetry of the Universe and neutrino mass from the Wilkinson Microwave Anisotropy Probe

Neutrinoless Double Beta Decay

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