A new upper limit for the tau-neutrino magnetic moment

Schwienhorst, R.; Ciampa, D.; Erickson, C.; Graham, M. T.; Heller, K.; Rusack, R.; Sielaff, J.; Trammell, J.; Wilcox, J.; Kodama, K.; Ushida, N.; Andreopoulos, C.; Saoulidou, N.; Tzanakos, G.; Yager, P. M.; Baller, B.; Boehnlein, D.; Freeman, W.; Lundberg, B.; Morfín, J.; Rameika, R.; Yun, J. C.; Song, Jeonghyeon; Yoon, C. S.; Chung, S. H.; Berghaus, P.; Kubantsev, M.; Reay, N. W.; Sidwell, R. A.; Stanton, N. R.; Yoshida, S.; Aoki, S.; Hara, T.; Rhee, Jiyoung; Hoshino, K.; Jiko, H.; Miyanishi, M.; Komatsu, M.; Nakamura, Makoto; Nakano, T.; Niwa, K.; Nonaka, N.; Okada, K.; Sato, Osamu; Akdoğan, T.; Paolone, V.; Rosenfeld, C.; Kulik, A.V.; Kafka, T.; Oliver, W. P.; Patzak, T.; Schneps, J.

doi:10.1016/s0370-2693(01)00746-8

Cited by 79 publications

(55 citation statements)

References 19 publications

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“…The picture shows the absence of any strong correlation between r 2 V (ν τ ) and r 2 A (ν τ ) . We stress that the possibility of bounding simultaneously the vector and axial vector charge radii stems from the fact that in e + e − annihilation also the righthanded neutrinos can be produced, and they couple to the photon through a combination of r Before concluding this section, we should mention that independent limits could also be derived from the DONUT experiment, through an analysis similar to the one presented in [54], and that yielded limits on the ν τ magnetic moment. We have estimated that the constraints from DONUT would be at least one order of magnitude worse than the limits obtained from LEP; however, it should be remarked that these limits would be inferred directly from the absence of anomalous interactions for a neutrino beam with an identified ν τ component [55].…”

Section: Lep-2mentioning

confidence: 99%

Bounds on the tau and muon neutrino vector and axial vector charge radius

2003

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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 . Experimental information on this quantity is scarce, especially in the case of the tau neutrino. We present a comprehensive analysis of the available data on the single photon production process e + e − → ννγ off Z-resonance, and we discuss the constraints that these measurements can set on r 2 A for the τ neutrino. We also derive limits for the Dirac case, when the presence of a vector charge radius r 2 V is allowed. Finally, we comment on additional experimental data on ν µ scattering from the NuTeV, E734, CCFR and CHARM-II collaborations, and estimate the limits implied for r 2 A and r 2 V for the muon neutrino.

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Section: Lep-2mentioning

confidence: 99%

Bounds on the tau and muon neutrino vector and axial vector charge radius

2003

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“…The arguably cleanest experimental probe for electromagnetic properties is neutrino scattering off of electrons, with the electron's recoil and scattering angle as handles to distinguish the new physics from SM contributions. The electron-neutrino's effective magnetic moment is constrained by GEMMA [12] (reactorν e -e − ), the muon neutrino's by LSND [13] (accelerator ν µ ,ν µ -e − ), and the τ neutrino's by DONUT [14] (accelerator ν τ ,ν τ -e − ). At 90% C.L., the limits are…”

Section: Experimental Statusmentioning

confidence: 99%

Triangle inequalities for Majorana-neutrino magnetic moments

2015

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Electromagnetic properties of neutrinos, if ever observed, could help to decide the Dirac versus Majorana nature of neutrinos. We show that the magnetic moments of Majorana neutrinos have to fulfill triangle inequalities, |µ ντ | 2 ≤ |µ νµ | 2 +|µ νe | 2 and cyclic permutations, which do not hold for Dirac neutrinos. Observing a violation of these inequalities, e.g. by measuring the magnetic moment of ν τ at SHiP, would thus strongly hint either at the Dirac nature of neutrinos or at the presence of at least one extra light sterile mode.

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“…Thus far we have said nothing about µ τ . At the energies considered here ν τ 's cannot be produced, save for ν µ → ν τ oscillation effects which are negligible at our assumed short baseline of 100 m. Although our analysis cannot add to the subject, we point out, for completeness, that the Fermilab DONUT experiment has set a weak upper bound of 3.7 × 10 −7 µ B on µ τ at 90% confidence [41].…”

Section: B Neutrino Magnetic Momentsmentioning

confidence: 83%

What can we learn from neutrino electron scattering?

Gouvêa

Jenkins²

2006

Phys. Rev. D

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Precision tests of the standard model are essential for constraining models of new physics. Neutrino-electron elastic scattering offers a clean probe into many electroweak effects that are complimentary to the more canonical measurements done at collider facilities. Such reactions are rare, even as compared with the already tiny cross-sections for neutrino-nucleon scattering, and competitive precision measurements have historically been challenging to obtain. Due to new existing and proposed high-flux neutrino sources, this is about to change. We present a topical survey of precision measurements that can be done with neutrino-electron scattering in light of these new developments. Specifically, we consider four distinct neutrino sources: nuclear reactors, neutrino factories, beta-beams, and conventional beams. For each source we estimate the expected future precision of several representative observables, including the weak mixing angle, neutrino magnetic moments, and potential leptonic Z ′ couplings. We find that future neutrino-electron scattering experiments should add non-trivially to our understanding of fundamental physics.

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A new upper limit for the tau-neutrino magnetic moment

Cited by 79 publications

References 19 publications

Bounds on the tau and muon neutrino vector and axial vector charge radius

Bounds on the tau and muon neutrino vector and axial vector charge radius

Triangle inequalities for Majorana-neutrino magnetic moments

What can we learn from neutrino electron scattering?

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