STUDY OF NEUTRINO MAGNETIC MOMENT USING THE LHC NEUTRINOS

Date

2026-2-27

Author

Dinç, Cemal

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The electromagnetic properties of neutrinos provide a sensitive probe of physics beyond the Standard Model. In particular, a non-zero tau-neutrino magnetic moment would enhance neutrino–electron elastic scattering at low recoil energies, producing a characteristic deviation from the purely weak interaction prediction. This search is performed with the SND@LHC detector, a compact and stand-alone experiment designed to study high-energy neutrinos produced at the Large Hadron Collider in a previously unexplored kinematic region. The detector, based on an 800 kg tungsten target interleaved with emulsion and electronic tracking layers and followed by a calorimeter and muon system, enables efficient flavor identification. The analysis uses the full SND@LHC data set corresponding to an integrated luminosity 300 fb^−1. No candidate events are observed after the full selection, and the expected Standard Model background is consistent with zero event. A 90% confidence level upper limit on the tau-neutrino magnetic moment is therefore derived. Both frequentist and Bayesian approaches yield μντ < 3.68 × 10^−6 μB . A sensitivity projection for the SND@HL-LHC configuration, assuming an integrated luminosity of 3 ab^−1 indicates that the significantly increased neutrino flux in the high-luminosity era will allow substantially stronger constraints on μντ . Under the assumption of negligible background and no observed excess, the projected sensitivity surpasses the existing limit reported by the DONUT experiment.

Subject Keywords

Tau neutrino, BSM, Magnetic Moment, SND@LHC

URI

https://hdl.handle.net/11511/119006

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Graduate School of Natural and Applied Sciences, Thesis