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• W3217177462 abstract "The observation of the coherent elastic neutrino-nucleus scattering (CE$nu$NS) provides us opportunities to explore a wide class of new physics. In the Standard Model (SM), the CE$nu$NS process arises from the vector and axial-vector neutral currents through the exchange of $Z$ boson and the axial-vector current contribution turns out to be subdominant. It is thus natural to consider the extra contributions to CE$nu$NS from more generic new physics beyond the SM with (axial-)vector interactions associated with a new vector mediator $Z'$. Besides the ordinary CE$nu$NS, the active neutrinos can convert into a new exotic fermion $chi$ through the process $nu Nto chi N$ mediated by $Z'$ without violating the coherence. It would be interesting to consider the implication of this conversion for the new fermion sector beyond the SM. We consider the framework of a simplified neutrino model in which a new Dirac fermion $chi$ interacts with active neutrinos and a leptophobic vector mediator $Z'$. We evaluate both the tree-level and loop-level contributions to the CE$nu$NS and in particular the loop diagrams produce active neutrino elastic scattering process $nu Nto nu N$ with the fermion $chi$ inside the loops. When the interaction between $Z'$ and the SM quarks is vector type and axial-vector type, the CE$nu$NS processes are respectively dominated by the tree-level and loop-level contributions. We investigate the constraints on the model parameters by fitting to the COHERENT data, assuming a wide range of $m_chi$. The parameter space with $m_chi$ larger than the maximal energy of incoming neutrinos can be constrained by including the loop-level contribution. More importantly, the inclusion of loop diagrams can place constraint on axial-vector interaction whose tree-level process is absent in the coherent neutrino-nucleus scattering." @default.
• W3217177462 created "2021-12-06" @default.
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• W3217177462 date "2021-11-19" @default.
• W3217177462 modified "2023-10-16" @default.
• W3217177462 title "Loop effects with a vector mediator in coherent neutrino-nucleus scattering" @default.
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• W3217177462 doi "https://doi.org/10.1103/physrevd.104.095017" @default.
• W3217177462 hasPublicationYear "2021" @default.
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