The weak mixing angle from low energy neutrino measurements: A global update

Cañas, B.C.; Garcés, E. A.; Miranda, O. G.; Tórtola, M.; Valle, J. W. F.

doi:10.1016/j.physletb.2016.08.047

Cited by 17 publications

(34 citation statements)

References 42 publications

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“…As our first application, we turn off the NSIs and fit sin 2 (θ W ) to the Borexino low-energy data in Sec. 4 and compare to the results of several other studies [18][19][20].…”

Section: Introductionmentioning

confidence: 58%

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sin2 θ W estimate and bounds on nonstandard interactions at source and detector in the solar neutrino low-energy regime

Khan

McKay

2017

J. High Energ. Phys.

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Abstract:We explore the implications of the Borexino experiment's real time measurements of the lowest energy part of the neutrino spectrum from the primary pp fusion process up to 0.420 MeV through the 7 Be decay at 0.862 MeV to the pep reaction at 1.44 MeV. We exploit the fact that at such low energies, the large mixing angle solution to the MikheyevSmirnov-Wolfenstein matter effects in the sun are small for 7 Be and pep and negligible for pp. Consequently, the neutrinos produced in the sun change their flavor almost entirely through vacuum oscillations during propagation from the sun's surface and through possible nonstandard interactions acting at the solar source and Borexino detector. We combine the different NSI effects at source and detector in a single framework and use the current Borexino data to bound NSI non-universal and flavor-changing parameters at energies below the reach of reactor neutrino experiments. We also study the implication of the current data for the weak-mixing angle at this "low-energy frontier" data from the Borexino experiment, where it is expected to be slightly larger than its value at the Z mass. We find sin 2 θ W = 0.224 ± 0.016, the lowest energy-scale estimate to date. Looking to the future, we use projected sensitivities to solar neutrinos in next generation dedicated solar experiments and direct dark matter detection experiments and find a potential factor five improvement in determination of the weak-mixing angle and up to an order of magnitude improvement in probing the NSI parameters space.

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“…As our first application, we turn off the NSIs and fit sin 2 (θ W ) to the Borexino low-energy data in Sec. 4 and compare to the results of several other studies [18][19][20].…”

Section: Introductionmentioning

confidence: 58%

“…There is ongoing interest in the low-energy determination of the weak-mixing angle sin 2 (θ W ) [20,51]. Presently the lowest energy determination of the weak-mixing parameter sin 2 (θ W ) is that provided by the parity-violation measurement in 133 Cs at 2.4 MeV [52][53][54].…”

Section: The Standard Model: Low-energy Fit To Sin 2 (θ W )mentioning

confidence: 99%

sin2 θ W estimate and bounds on nonstandard interactions at source and detector in the solar neutrino low-energy regime

Khan

McKay

2017

J. High Energ. Phys.

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“…A degenerate area is found that cannot be excluded by the current data, due to the cancellations involved in Eq. (21). For heavy mediator masses, M Z √ 2M T N ∼ 50 MeV, this degeneracy remains unbroken and depends on the ratio…”

Section: Vector Z and Scalar φ Mediatorsmentioning

confidence: 99%

COHERENT constraints to conventional and exotic neutrino physics

2018

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The process of neutral-current coherent elastic neutrino-nucleus scattering, consistent with the Standard Model (SM) expectation, has been recently measured by the COHERENT experiment at the Spallation Neutron Source. On the basis of the observed signal and our nuclear calculations for the relevant Cs and I isotopes, the extracted constraints on both conventional and exotic neutrino physics are updated. The present study concentrates on various SM extensions involving vector and tensor nonstandard interactions as well as neutrino electromagnetic properties, with an emphasis on the neutrino magnetic moment and the neutrino charge radius. Furthermore, models addressing a light sterile neutrino state and scenarios with new propagator fields-such as vector Z and scalar bosons-are examined, and the corresponding regions excluded by the COHERENT experiment are presented. * dimpap@cc.uoi.gr † hkosmas@uoi.gr

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“…The PVDIS Collaboration [7] at the 6 GeV CEBAF complex at JLab scattered polarized electrons deep-inelastically from deuterium, and the SoLID Collaboration [8] will increase the PVDIS precision in the future by benefiting from the energy upgraded CEBAF and a correspondingly higher and broader Q 2 range. Other approaches include neutrino and anti-neutrino deep inelastic scattering [9],ν-e scattering near nuclear reactors [10], and parity violation in atoms [11] and ions [12]. For more details, see the recent reviews on low energy measurements of the weak mixing angle [13], on the weak neutral current [14], and on weak polarized electron scattering [15].…”

Section: Introductionmentioning

confidence: 99%

Weak mixing angle in the Thomson limit

Erler¹,

Ferro-Hernández²

2018

J. High Energ. Phys.

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We present a calculation of the weak mixing angle in the MS renormalization scheme which is relevant for experiments performed at very low energies or momentum transfers. We include higher orders in the perturbative QCD expansion, as well as updated phenomenological and theoretical input, and obtain the result sin 2θ W (0) = 0.23868(5)(2) for the reference valuesα s (M Z ) = 0.1182 andm c (m c ) = 1.272 GeV. The first quoted error is from the current Standard Model evaluation of the mixing angle at the Z boson mass scale. The second error represents the theoretical and parametric uncertainties induced by the evolution to the Thomson limit and is discussed in detail.

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The weak mixing angle from low energy neutrino measurements: A global update

Cited by 17 publications

References 42 publications

sin2 θ W estimate and bounds on nonstandard interactions at source and detector in the solar neutrino low-energy regime

sin2 θ W estimate and bounds on nonstandard interactions at source and detector in the solar neutrino low-energy regime

COHERENT constraints to conventional and exotic neutrino physics

Weak mixing angle in the Thomson limit

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