Implications of the first <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>CONUS</mml:mi><mml:mo>+</mml:mo></mml:mrow></mml:math> measurement of coherent elastic neutrino-nucleus scattering

The <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>CONUS</a:mi><a:mo>+</a:mo></a:mrow></a:math> collaboration has reported their first observation of coherent elastic neutrino-nucleus scattering (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mi>CE</c:mi><c:mrow><c:mi>ν</c:mi></c:mrow><c:mi>NS</c:mi></c:mrow></c:math>). The experiment uses reactor electron antineutrinos and germanium detectors with recoil thresholds as low as <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mn>160</e:mn><e:mtext> </e:mtext><e:mtext> </e:mtext><e:mrow><e:msub><e:mi>eV</e:mi><e:mi>ee</e:mi></e:msub></e:mrow></e:math>. With an exposure of <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mrow><g:mn>327</g:mn><g:mtext> </g:mtext><g:mtext> </g:mtext><g:mi>kg</g:mi><g:mo>×</g:mo><g:mi mathvariant="normal">d</g:mi></g:mrow></g:math>, the measurement was made with a statistical significance of <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"><j:mn>3.7</j:mn><j:mi>σ</j:mi></j:math>. We explore several physics implications of this observation, both within the standard model and in the context of new physics. We focus on a determination of the weak mixing angle, nonstandard and generalized neutrino interactions both with heavy and light mediators, neutrino magnetic moments, and the up-scattering of neutrinos into sterile fermions through the sterile dipole portal and new mediators. Our results highlight the role of reactor-based <l:math xmlns:l="http://www.w3.org/1998/Math/MathML" display="inline"><l:mrow><l:mi>CE</l:mi><l:mrow><l:mi>ν</l:mi></l:mrow><l:mi>NS</l:mi></l:mrow></l:math> experiments in probing a vast array of neutrino properties and new physics models.