BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Decoding Neutrino Interactions: A Model-Independent Approach with DUNE-PRISM DTSTART:20260703T103000Z DTEND:20260703T120000Z DTSTAMP:20260703T112943Z UID:50398328-0595-4534-b6e7-86efaf3247c1 SEQUENCE:3 CREATED:20260701T080934Z DESCRIPTION:The observed excess of matter over antimatter cannot be explai ned by Standard Model Charge-Parity (CP) violation alone\, motivating sear ches for additional CP-violating sources in the neutrino sector. The Deep Underground Neutrino Experiment (DUNE) aims to probe leptonic CP violation through precision long-baseline oscillation measurements sensitive to δ . However\, its sensitivity depends on disentangling flux and cross-sectio n effects at the 𝐶𝑃 near detector\, where event rates constrain only the product ϕ(𝐸 rather than either ν )σ(𝐸 ν ) quantity separate ly. This thesis investigates whether DUNE-PRISM off-axis flux matching can partially lift this degeneracy and enable robust measurements of neutrino cross-section single and double ratios. An end-to-end analysis framework was developed\, extending idealised flux matching to a measurement-level t reatment of event-rate construction\, wrong-sign background subtraction\, detector response\, reconstructed-energy observables\, and statistical\, f lux\, and cross-section uncertainty propagation. The results show that the double ratio reduces systematic uncertainties relative to single ratios\, demonstrating enhanced cancellation of correlated effects between species and beam modes. The measurement is systematics-limited rather than statis tics-limited: flux systematics provide the dominant contribution\, while c ross-section uncertainties remain smaller but non-negligible. Wrong-sign b eam components modify the uncertainty budget\, showing that right-sign-onl y studies do not capture the behaviour and limitations of the realistic me asurement. Together\, these findings demonstrate the feasibility of PRISM- based double-ratio extraction under realistic conditions and identify flux systematic uncertainties as the dominant limitation once the full right-s ign and wrong-sign beam composition is considered. The framework developed here supports future DUNE-PRISM cross-section and systematic studies\, es tablishing double-ratio observables as a promising strategy for reducing i nteraction-model dependence LAST-MODIFIED:20260702T101028Z LOCATION:Online URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/decoding-neutrino-interact ions-a-model-independent-approach-with-dune-prism/ X-ALT-DESC;FMTTYPE=text/html:

The observed excess of matter over antimatter cannot be explained by Standard Model Charge-Pa rity (CP) violation alone\, motivating searches for additional CP-violatin g sources in the neutrino sector. The Deep Underground Neutrino Experiment (DUNE) aims to probe leptonic CP violation through precision long-baselin e oscillation measurements sensitive to δ . However\, its sensitivity dep ends on disentangling flux and cross-section effects at the 𝐶𝑃 near detector\, where event rates constrain only the product ϕ(𝐸 rather tha n either ν )σ(𝐸 ν ) quantity separately.

This thesis inves tigates whether DUNE-PRISM off-axis flux matching can partially lift this degeneracy and enable robust measurements of neutrino cross-section single and double ratios. An end-to-end analysis framework was developed\, exten ding idealised flux matching to a measurement-level treatment of event-rat e construction\, wrong-sign background subtraction\, detector response\, r econstructed-energy observables\, and statistical\, flux\, and cross-secti on uncertainty propagation.

The results show that the double rat io reduces systematic uncertainties relative to single ratios\, demonstrat ing enhanced cancellation of correlated effects between species and beam m odes. The measurement is systematics-limited rather than statistics-limite d: flux systematics provide the dominant contribution\, while cross-sectio n uncertainties remain smaller but non-negligible. Wrong-sign beam compone nts modify the uncertainty budget\, showing that right-sign-only studies d o not capture the behaviour and limitations of the realistic measurement.< br/>
Together\, these findings demonstrate the feasibility of PRISM-b ased double-ratio extraction under realistic conditions and identify flux systematic uncertainties as the dominant limitation once the full right-si gn and wrong-sign beam composition is considered. The framework developed here supports future DUNE-PRISM cross-section and systematic studies\, est ablishing double-ratio observables as a promising strategy for reducing in teraction-model dependence

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