# Recent results on pp-chain solar neutrinos with the Borexino detector

## TL;DR

This paper reports a precise measurement of solar neutrinos from the pp-chain using the Borexino detector, providing insights into solar composition, neutrino oscillation parameters, and testing the MSW-LMA mechanism.

## Contribution

It presents the first simultaneous precision spectroscopic measurement of all components of the solar pp-chain with the Borexino detector, addressing key questions in solar and neutrino physics.

## Key findings

- Measurement of all pp-chain neutrino fluxes.
- Implications for solar metallicity models.
- Insights into neutrino oscillation parameters.

## Abstract

Measuring all neutrino components is the most direct way to test the standard solar model (SSM). Despite the great results obtained so far, important questions such as the solar metallicity remain open. A precise measurement of the solar pp chain and the CNO cycle would settle this controversy between high (HZ) and low (LZ) metallicity compositions of the Sun. Solar neutrinos allow the determination of oscillation parameters, in particular the $\theta_{12}$ mixing angle and, to a lesser degree the $\Delta m^2_{12}$ mass splitting. Furthermore the measurement of the electron neutrino survival probability Pee as a function of neutrino energy allows one to directly probe the MSW-LMA mechanism of neutrino oscillations In this work I will report the first simultaneous precision spectroscopic measurement of the complete pp-chain and its implications for both solar and neutrino physics with the Borexino detector.