Probing neutrino nature at Borexino detector with chromium neutrino source

Sobków, W.; Błaut, Arkadiusz

doi:10.1140/epjc/s10052-016-4406-0

Cited by 4 publications

(5 citation statements)

References 110 publications

(133 reference statements)

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“…|η ν ·q| = |1 − 2Q ν L |, where Q ν L is the probability of producing the LC ν e . We see that the interference terms between standard V − A and exotic S R , P R couplings depend on the transversal ν e spin polarization related to the production process (similar regularity as in the Dirac case [21]).…”

Section: Discussionsupporting

confidence: 58%

“…It is worth reminding that the PET has been proposed to test the flavor composition of (anti)neutrino beam [20] and various effects of non-standard physics. We mean the neutrino magnetic moments, TRSV in the leptonic processes [21], axions, spin-spin interaction in gravitation [22][23][24][25][26][27][28] The possibility of using polarized targets of nucleons and of electrons for the fermionic, scalar and vector dark matter detection is also worth noticing [29][30][31]. The methods of producing the spin-polarized gasses such as helium, argon and xenon are described in [32,33].…”

Section: Introductionmentioning

confidence: 99%

“…We utilize the experimental values of standard couplings: c L V = 1 + (−0.04 ± 0.015), c L A = 1 + (−0.507 ± 0.014) to evaluate the predicted effects [84]. The laboratory differential cross sections (see Appendix 1 for the Majorana ν e s and [21] for the Dirac case) are calculated with the use of the covariant projectors for the incoming ν e s (including both the longitudinal and transversal components of the spin polarization) in the relativistic limit and for the polarized targetelectrons, respectively [85].…”

Section: Introductionmentioning

confidence: 99%

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Neutrino elastic scattering on polarized electrons as a tool for probing the neutrino nature

Błaut

Sobków

2020

Eur. Phys. J. C

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Possibility of using the polarized electron target (PET) for testing the neutrino nature is considered. One assumes that the incoming electron neutrino (ν e ) beam is the superposition of left chiral states with right chiral ones. Consequently the non-vanishing transversal components of ν e spin polarization may appear, both T-even and T-odd. ν e s are produced by the low energy monochromatic (un)polarized emitter located at a near distance from the hypothetical detector which is able to measure both the azimuthal angle and polar angle of the recoil electrons, and/or also the energy of the outgoing electrons with a high resolution. A detection process is the elastic scattering of ν e s (Dirac or Majorana) on the polarized electrons. Left chiral (LC) ν e s interact mainly by the standard V − A interaction, while right chiral (RC) ones participate only in the non-standard V + A, scalar S R , pseudoscalar P R and tensor T R interactions. We show that a distinction between the Dirac and Majorana ν e s is possible both for the purely left chiral states and the left-right superposition. In the first case a departure from the standard prediction of the azimuthal asymmetry of recoil electrons is caused by the interferences between the non-standard complex S and T couplings, proportional to the angular correlations (T-even and T-odd) among the polarization of the electron target, the incoming neutrino momentum and the outgoing electron momentum. Such a deviation would indicate the Dirac nature of ν e s. In the second variant the azimuthal asymmetry, polar distribution and energy spectrum of scattered electrons are sensitive to the interference terms between the standard and exotic interactions, proportional to the various angular correlations (T-even and T-odd) among the transversal ν e spin polarization (related to the ν e source), the electron target polarization, the incoming ν e momentum and the outgoing electron momentum. The basic difference a between the Dirac and Majorana ν e s arises from the absence of T and V interactions in the Majorana scenario. Moreover, in the Majorana case the above observables contain the non-vanishing interference between V − A and V + A interactions, proportional to the T-even longitudinal ν e polarization. Our model-independent study is carried out for the flavor ν e eigenstates in the relativistic ν e limit.

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Section: Discussionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neutrino elastic scattering on polarized electrons as a tool for probing the neutrino nature

Błaut

Sobków

2020

Eur. Phys. J. C

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“…The main difficulty in determining the Majorana character is that in theories with V − A interactions, this is the case of the Standard Model, any observable difference between Dirac and Majorana neutrinos is suppressed by a factor (m μ /E) 2 , being E the energy scale of the process [164]. However, an interesting possibility arises in the case in which neutrinos have new interactions beyond the SM [165]. In is worth of mentioning, for example, the proposal of ref.…”

Section: Dirac and Majorana Neutrinosmentioning

confidence: 99%

Einstein, Planck and Vera Rubin: Relevant Encounters Between the Cosmological and the Quantum Worlds

et al. 2021

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In Cosmology and in Fundamental Physics there is a crucial question like: where the elusive substance that we call Dark Matter is hidden in the Universe and what is it made of? that, even after 40 years from the Vera Rubin seminal discovery [1] does not have a proper answer. Actually, the more we have investigated, the more this issue has become strongly entangled with aspects that go beyond the established Quantum Physics, the Standard Model of Elementary particles and the General Relativity and related to processes like the Inflation, the accelerated expansion of the Universe and High Energy Phenomena around compact objects. Even Quantum Gravity and very exotic Dark Matter particle candidates may play a role in framing the Dark Matter mystery that seems to be accomplice of new unknown Physics. Observations and experiments have clearly indicated that the above phenomenon cannot be considered as already theoretically framed, as hoped for decades. The Special Topic to which this review belongs wants to penetrate this newly realized mystery from different angles, including that of a contamination of different fields of Physics apparently unrelated. We show with the works of this ST that this contamination is able to guide us into the required new Physics. This review wants to provide a good number of these “paths or contamination” beyond/among the three worlds above; in most of the cases, the results presented here open a direct link with the multi-scale dark matter phenomenon, enlightening some of its important aspects. Also in the remaining cases, possible interesting contacts emerges. Finally, a very complete and accurate bibliography is provided to help the reader in navigating all these issues.

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“…However, if neutrinos have new interactions beyond the SM, the situation can be different -see [26] for a recent realization of this idea. Considering that massive neutrinos discovered via neutrino oscillations are regarded as an evidence of new physics beyond the SM, they may also be accompanied with new interactions.…”

Section: Introductionmentioning

confidence: 99%

Distinguishing between Dirac and Majorana neutrinos in the presence of general interactions

Rodejohann

Yaguna

2017

J. High Energ. Phys.

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Abstract:We revisit the possibility of distinguishing between Dirac and Majorana neutrinos via neutrino-electron elastic scattering in the presence of all possible Lorentz-invariant interactions. Defining proper observables, certain regions of the parameter space can only be reached for Dirac neutrinos, but never for Majorana neutrinos, thus providing an alternative method to differentiate these two possibilities. We first derive analytically and numerically the most general conditions that would allow to distinguish Dirac from Majorana neutrinos, both in the relativistic and non-relativistic cases. Then, we apply these conditions to data on ν µ -e andν e -e scatterings, from the CHARM-II and TEXONO experiments, and find that they are consistent with both types of neutrinos. Finally, we comment on future prospects of this kind of tests.

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Probing neutrino nature at Borexino detector with chromium neutrino source

Cited by 4 publications

References 110 publications

Neutrino elastic scattering on polarized electrons as a tool for probing the neutrino nature

Neutrino elastic scattering on polarized electrons as a tool for probing the neutrino nature

Einstein, Planck and Vera Rubin: Relevant Encounters Between the Cosmological and the Quantum Worlds

Distinguishing between Dirac and Majorana neutrinos in the presence of general interactions

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