Electromagnetic properties of Majorana neutrinos

Nieves, José F.

doi:10.1103/physrevd.26.3152

Cited by 150 publications

(144 citation statements)

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“…However, since (27) hints to a non-vanishing value of δ , no lower limit is 6 Except for the CCFR data, which is consistent with the SM precision fits.…”

Section: Limits On ν µ Vector and Axial Vector Charge Radiussupporting

confidence: 71%

“…Since the results for neutrino experiments and the measurements at the Zpole are not consistent at the 1σ level, in the following equations (29)- (31) we will (conservatively) combine the errors by adding them linearly. 6 From the NuTeV result (27) we obtain the 90 % c.l. upper limit:…”

Section: Limits On ν µ Vector and Axial Vector Charge Radiusmentioning

confidence: 99%

“…On the other hand, the W box diagrams needed to recover gauge invariance connect initial state fermions to the final states, and therefore depend on the specific process. This indicates that at one-loop, the amplitude cannot be straightforwardly written in the factorized form (6), and that the definition of an improved and process independent e + e − Z vertex is indeed problematic. This problem is even more acute when one tries to define the charge radius of a neutrino as a physical, process independent property, intrinsic to this particle.…”

Section: Introductionmentioning

confidence: 99%

“…In the non-diagonal case (ν M j = ν M i ) and in the limit of CP invariance the electromagnetic interaction is described by just two form factors [6]. If the initial and final Majorana neutrinos involved in the process have the same CP parity, only E M ji (q 2 ) and A M ji (q 2 ) are non vanishing, while if the CP parity is opposite, the electromagnetic interaction is described by M M ji (q 2 ) and V M ji (q 2 ).…”

Section: Introductionmentioning

confidence: 99%

“…The electromagnetic properties of Dirac neutrinos are described in terms of four form factors. The matrix element of the electromagnetic current between an initial neutrino state ν i with momentum p i and a final state ν j with momentum p j reads [6,7] …”

Section: Introductionmentioning

confidence: 99%

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On the Neutrino Vector and Axial Vector Charge Radius

Nardi¹

2003

AIP Conference Proceedings

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Abstract.A Majorana neutrino is characterized by just one flavor diagonal electromagnetic form factor: the anapole moment, that in the static limit corresponds to the axial vector charge radius r 2 A . As is the case for the vector charge radius of a Dirac neutrino, proving that this quantity is a well defined physical quantity is non trivial. I will first describe briefly the origin of the long standing controversy about the physical or non physical nature of the neutrino charge radius. Then I will argue that, in contrast to Dirac neutrino electromagnetic form factors, for Majorana neutrinos cosmological and astrophysical arguments do not provide useful informations on r 2 A . Therefore this quantity has to be studied by means of terrestrial experiment. Finally, I will discuss the constraints that can be derived on r 2 A for the tau neutrino from a comprehensive analysis of the data on single photon production off Z-resonance, and I will conclude with a few comments on ν µ scattering data from the NuTeV, E734, CCFR and CHARM-II collaborations and on the limits implied for r 2 A for the muon neutrino.

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“…However, since (27) hints to a non-vanishing value of δ , no lower limit is 6 Except for the CCFR data, which is consistent with the SM precision fits.…”

Section: Limits On ν µ Vector and Axial Vector Charge Radiussupporting

confidence: 71%

Section: Limits On ν µ Vector and Axial Vector Charge Radiusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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