Probing the νR-philic Z′ at DUNE near detectors

Chauhan, Garv;et.al.
(2023) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 841 (2023)

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  • Chauhan, GarvUCLouvain
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Abstract
We consider a hidden <math altimg="si1.svg"><mi>U</mi><mo stretchy="false">(</mo><mn>1</mn><mo stretchy="false">)</mo></math> gauge symmetry under which only the right-handed neutrinos (<math altimg="si2.svg"><msub><mrow><mi>ν</mi></mrow><mrow><mi>R</mi></mrow></msub></math>) are charged. The corresponding gauge boson is referred to as the <math altimg="si2.svg"><msub><mrow><mi>ν</mi></mrow><mrow><mi>R</mi></mrow></msub></math>-philic <math altimg="si3.svg"><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup></math>. Despite the absence of direct gauge couplings to ordinary matter at tree level, loop-induced couplings of the <math altimg="si2.svg"><msub><mrow><mi>ν</mi></mrow><mrow><mi>R</mi></mrow></msub></math>-philic <math altimg="si3.svg"><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup></math> via left-right neutrino mixing can be responsible for its experimental accessibility. An important feature of the <math altimg="si2.svg"><msub><mrow><mi>ν</mi></mrow><mrow><mi>R</mi></mrow></msub></math>-philic <math altimg="si3.svg"><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup></math> is that its couplings to neutrinos are generally much larger than its couplings to charged leptons and quarks, thus providing a particularly interesting scenario for future neutrino experiments such as DUNE to probe. We consider two approaches to probe the <math altimg="si2.svg"><msub><mrow><mi>ν</mi></mrow><mrow><mi>R</mi></mrow></msub></math>-philic <math altimg="si3.svg"><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup></math> at DUNE near detectors via (i) searching for <math altimg="si3.svg"><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup></math> decay signals, and (ii) precision measurement of elastic neutrino-electron scattering mediated by the <math altimg="si3.svg"><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup></math> boson. We show that the former will have sensitivity comparable to or better than previous beam dump experiments, while the latter will improve current limits substantially for large neutrino couplings.
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Chauhan, G., & et al. (2023). Probing the νR-philic Z′ at DUNE near detectors. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 841. https://doi.org/10.1016/j.physletb.2023.137907 (Original work published 2023)