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arXiv · 2410.08981

Enhancing the Sensitivity to Seesaw Predictions in Gauged $B-L$ Scenarios

Francesco Capozzi·Bhaskar Dutta·Gajendra Gurung·Wooyoung Jang·Ian M. Shoemaker·Adrian Thompson·Jaehoon Yu
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Abstract

New gauge bosons coupled to heavy neutral leptons (HNLs) are simple and well-motivated extensions of the Standard Model. In searches for HNLs in proton fixed-target experiments, we find that a large population of gauge bosons ($Z^\prime$) produced by proton bremsstrahlung may decay to HNLs, leading to a significant improvement in existing bounds on the ($m_{HNL}, U_{\alpha}$), where $U_\alpha$ represent the mixing between HNL and the active neutrinos with flavor $\alpha$. We study this possibility in fixed target experiments with the 8 GeV proton beams, including SBND, MicroBooNE, and ICARUS, as well as DUNE and DarkQuest at 120 GeV. We find the projected sensitivities to additional $Z^\prime$-mediated HNL production can bring the seesaw mechanism of the neutrino masses within a broadened experimental reach.

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Francesco Capozzi, Bhaskar Dutta, Gajendra Gurung, Wooyoung Jang, Ian M. Shoemaker, Adrian Thompson, Jaehoon Yu. 2024-10-11. Enhancing the Sensitivity to Seesaw Predictions in Gauged $B-L$ Scenarios. https://doi.org/10.1103/physrevd.111.055036

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