sin 2 θ W estimate and neutrino electromagnetic properties from low-energy solar data

Khan, Amir N.

doi:10.1088/1361-6471/ab0057

Title: sin ² θ _W estimate and neutrino electromagnetic properties from low-energy solar data

Journal Article · Wed Feb 13 00:00:00 EST 2019 · Journal of Physics. G, Nuclear and Particle Physics

DOI:https://doi.org/10.1088/1361-6471/ab0057· OSTI ID:1487070

^[1]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Theoretical Physics Dept.

We report new values of weak-mixing angle ($$\sin ^{2}\theta _{W}$$)$$,$ neutrino effective magnetic moment and the charge radius using the lowest-energy (to-date) solar neutrino data of pp, $$^{7}$$Be and pep spectra from phase-I and phase-II runs of Borexino experiment. The best-fit values are $$\sin ^{2}\theta _{W}=$$0.235$$\pm $$0.019 with a precision comparable to that of the combined reactor and accelerator very short-baseline experiments and $$\mu _{\nu }^{eff}\leq 8.7\times 10^{-12}\mu _{B}$$ at 90% C.L. with a factor of 3 improvement than the previous bounds. This leads to the improvement of all the related magnetic moment matrix elements for the Majorana-type and Dirac-type in mass basis and also improvement on bounds on the flavor magnetic moment states. The bounds on the neutrino charged radii turn out to be $$-0.82\times 10^{-32}$$cm$$^{2}\leq \left \langle r_{\nu _{e}}^{2}\right \rangle \ \leq 1.27\times 10^{-32}$$ cm$$^{2}\ $$and $$-9\times 10^{-32}$$cm$$^{2}\leq \left \langle r_{\nu _{\mu },\nu _{\tau }}^{2}\right \rangle \ \leq 3.1\times 10^{-31}$$ cm$$^{2}\ $$ at 90% C.L..

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1487070

Report Number(s):: arXiv:1709.02930; FERMILAB-PUB-18-444-ND-T; 1622733

Journal Information:: Journal of Physics. G, Nuclear and Particle Physics, Vol. 46, Issue 3; ISSN 0954-3899

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Title: sin ² θ _W estimate and neutrino electromagnetic properties from low-energy solar data