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We thank Michele Maltoni, Concha Gonzalez-Garcia and Joao Paulo Pinheiro for kindly providing their neutrino oscillation and CE nu NS fit results. We also warmly thank Martin Gonzalez-Alonso for sharing the SMEFT likelihood. This project has received support from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 860881-HIDDeN and No. 101086085 - ASYMMETRY, and from the Spanish Research Agency (Agencia Estatal de Investigacion) through the Grant IFIC Centro de Excelencia Severo Ochoa No CEX2023-001292-S, Grant ID2020-113644GB-I00, Grant IFT Centro de Excelencia Severo Ochoa No CEX2020-001007-S and Grant PID2022-137127NB-I00 funded by MCIN/AEI/10.13039/501100011033. XM acknowledges funding from the European Union's Horizon Europe Programme under the Marie Sklodowska-Curie grant agreement no. 101066105-PheNUmenal. The work of DNT was supported by the Spanish MIU through the National Program FPU (grant number FPU20/05333). JLP also acknowledges financial support from Generalitat Valenciana through the plan GenT program (projects CIDEGENT/2018/019 and CIESGT2024-008), from the Spanish Research Agency (Agencia Estatal de Investigacion) through grant CNS2022-136013 funded by MICIU/AEI/10.13039/501100011033 and by "European Union NextGenerationEU/PRTR", and from the MCIU with funding from the European Union NextGenerationEU (PRTRC17.I01) and Generalitat Valenciana (ASFAE/2022/020). PC acknowledges support from Grant PID2022-142545NB-C21 funded by MCIN/AEI/10.13039/501100011033/ FEDER, UE, from the Spanish Research Agency through the grant CNS2023-145338 funded by MCIN/AEI/10.13039/501100011033 and by "European Union NextGenerationEU/PRTR". She is also supported by grant RYC2018-024240-I, funded by MCIN/AEI/10.13039/501100011033 and by "ESF Investing in your future".

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Improving the global SMEFT picture with bounds on neutrino NSI

Publicated to:Journal Of High Energy Physics. (2): 137- - 2025-02-20 (2), DOI: 10.1007/JHEP02(2025)137

Authors: Coloma, Pilar; Fernandez-Martinez, Enrique; Lopez-Pavon, Jacobo; Marcano, Xabier; Naredo-Tuero, Daniel; Urrea, Salvador

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Abstract

We analyze how neutrino oscillation and coherent elastic neutrino-nucleus scattering data impact the global SMEFT fit. We first review the mapping between the SMEFT parameters and the so-called NSI framework, commonly considered in the neutrino literature. We also present a detailed discussion of how the measurements for the normalization of neutrino fluxes and cross sections, that will also be affected by the new physics, indirectly impact the measured oscillation probabilities. We then analyze two well-motivated simplified scenarios. Firstly, we study a lepton flavour conserving case, usually assumed in global SMEFT analyses, showing the complementarity of neutrino oscillation and CE nu NS experiments with other low-energy observables. We find that the inclusion of neutrino data allows to constrain previously unbounded SMEFT operators involving the tau flavour and confirm the improvement of the constraint on a combination of Wilson coefficients previously identified. Moreover, we find that neutrino oscillation constraints on NSI are improved when embedded in the global SMEFT framework. Secondly, we study a lepton flavour violating scenario and find that neutrino data also improves over previously derived global constraints thanks to its sensitivity to new combinations of Wilson coefficients.

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