SAPHIR ARM 2026

Contribution List

14. Welcome

Prof. Alfonso Zerwekh (Universidad Tecnica Federico Santa Maria), Dr Nicolas Viaux Maira (Federico Santa Maria Technical University (CL))

07/01/2026, 10:30

15. Saphir y reflexiones del quinquenio

Francisca Garay Walls (Pontifical Catholic University of Chile (CL))

07/01/2026, 10:40

16. Oportunidades de financiamiento para la internacionalización

Mr Jack Brady (Instituto Milenio SAPHIR)

07/01/2026, 11:00

13. Nuclear Experiments at the Precision Frontier: β Decay, Symmetries, and CKM Unitarity

Pablo Antonio Aguilera Jorquera (Universita e INFN, Padova (IT))

07/01/2026, 11:20

Modern high-resolution gamma-ray spectroscopy is a cornerstone of contemporary experimental nuclear physics, particularly at radioactive-beam facilities where weak-decay and reaction channels must be isolated from large backgrounds. Gamma-ray tracking arrays such as the Advanced GAmma Tracking Array (AGATA) reconstruct interaction points and event topologies inside segmented HPGe detectors,...

8. Theoretical Study of Hadron Structure and New Physics at the NA64 and LHC Experiments

Prof. Valery Lyubovitsky (Millennium Institute for Subatomic Physics at High Energy Frontier (CL) and University of Tübingen (DE))

07/01/2026, 12:00

We present results of theoretical study of hadron structure and
New physics at the NA64 and LHC experiments: Drell-Yan and SIDIS reactions, heavy quarkonia production, decay properties of axion-like particles and dark photon.

17. Lunch

07/01/2026, 12:50

7. Detailed derivation of the 3P0 strong decay model applied to baryons

Telmo Aguilar (Universidad San Francisco de Quito)

07/01/2026, 14:40

This work examines the strong decay process of a baryon into a meson-baryon system using its decay width. Through the 3P0 pair creation model, the transition matrix of the process is calculated to assess its probability of occurrence. We simplify the calculation via Feynman diagram equivalences and the selection of an appropriate coordinate system (rho, lambda) for the internal quark structure...

2. "Niñas Atómicas" (Atomic Girls): An initiative that generates opportunities for young girls in STEM

Giovanna Cottin (Pontificia Universidad Católica de Chile (CL))

07/01/2026, 15:20

I will present the design, methodology, contents and main objectives of our Niñas Atómicas initiative, a scientific workshop for high-school girls that has taken place since 2022 under the scope of SAPHIR. I will show ongoing interdisciplinary research results from the 2024 and 2025 editions of the workshop, focusing on the participants’ perceived learning after completing the workshop. I will...

18. Coffe Break

07/01/2026, 16:00

19. SAPHIR Students Meeting

07/01/2026, 16:40

20. Talk by Giovanni de Lellis

08/01/2026, 10:00

3. Collider Accessible Long-Lived Inflaton Model

Manuel López Fuentes

08/01/2026, 11:00

In this talk, I will present the long-lived collider phenomenology of a model motivated by chaotic inflation.

We begin by reviewing the cosmic history of the universe and the arguments for inflationary theory, driven by the remarkable homogeneity and isotropy of the cosmic microwave background (CMB). We then discuss how the inflationary stage remains largely degenerate among many potential...

21. Coffe Break

08/01/2026, 11:40

1. What Long-Lived Particle have to say about the Re-heating Temperature

Paulo Areyuna

08/01/2026, 12:10

We study an extension to the Standard Model where Dark Matter is produced via the Super-WIMP mechanism. In this scenario, relic density strongly depends on the re-heating temperature. We identify the region of the parameter space that can be probed at collider facilities using Long-Lived particle searches, stablishing methods for indirectly constraining the re-heating temperature at colliders.

22. Lunch

08/01/2026, 12:50

4. CONDOR Observatory

Constanza Viviana Valdivieso Castillo (Federico Santa Maria Technical University (CL))

08/01/2026, 14:40

We present the COmpact Network of Detectors with Orbital Range (CONDOR) Observatory, a proposed high altitude gamma-ray and cosmic-ray observatory that will be the highest of its kind. It will be located at Cerro Toco in the Atacama Desert, Chile, at 5,300 m above sea level. In this work, we perform both analytical and machine learning based reconstructions of the arrival direction, energy and...

10. Advances in Cosmic-Ray Neutron Spectroscopy: Detector Response, Geometry Effects, and Flux Normalization

Franco López-Usquiano (Chilean Nuclear Energy Commission (CCHEN), Millenium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Andrés Bello University (UNAB))

08/01/2026, 15:20

Cosmic-ray neutron spectroscopy has become a powerful tool for studying environmental and atmospheric processes through measurements of neutron fields at ground level [1-4]. Building upon previous results focused on multi-site high-altitude measurements in northern Chile using the CEFNEN neutron spectrometer, this contribution presents recent advances with emphasis on detector response...

5. AC-LGADs Fermilab Front-End Electronics Characterization

Rene Antonio Rios Torres (Millennium Institute for Subatomic Physics at High Energy Frontier (CL))

08/01/2026, 16:00

We characterized the front-end electronics used to process high-frequency signals from low-gain avalanche diodes (LGADs) at the Fermilab Test Beam Facility. LGADs are silicon detectors employed for charged particle tracking, offering exceptional spatial and temporal resolution. The purpose of this characterization was to understand how the time resolution is influenced by the front-end...

23. Coffe break

08/01/2026, 16:40

9. Study of neutron spectra below 1 GeV at the SHiP Experiment

Francisco Aguilar Carvajal (Universidad Técnica Federico Santa María)

08/01/2026, 17:10

Link to access abstract PDF

6. Design and Optimization of Background Rejection for the SHiP Experiment

Sebastian Julio Fuenzalida Garrido (Federico Santa Maria Technical University (CL))

08/01/2026, 17:50

The Search for Hidden Particles (SHiP) is a new general-purpose experiment under development at the CERN SPS, designed to probe a broad class of Hidden Sector (HS) models that may account for dark matter, neutrino masses and oscillations, and the baryon asymmetry of the Universe. Exploiting the high-intensity 400 GeV SPS proton beam—and the resulting abundant production of charm mesons and...

11. Constraining the B-L model at the FCC-hh

Dr Yohan Mauricio Oviedo Torres (SAPHIR / UNAB)

08/01/2026, 18:30

We present a phenomenological study of the discovery potential of a new $Z^{\prime}$ vector boson, predicted by the B-L gauge symmetry, at the FCC-hh. We focus on the parameter space not yet excluded by data from the LHC, analyzing the dilepton production channel $p\ p \rightarrow Z^{\prime} \rightarrow l^{+} l^{-}$ ($l^{\pm} = e^{\pm}, \mu^{\pm}$) at a center-of-mass energy of $\sqrt{s} =...

12. Muonic dark photons jets machine learning tagger for cosmic ray background mitigation using the ATLAS detector

Gabriel Fraczinet Gonzalez (Pontifical Catholic University of Chile (CL))

A variety of theoretical extensions to the Standard Model (SM) propose the existence of a dark sector. Some of this models propose a dark photon that can decay into SM fermions serving as a mediator within the SM sectors and the dark sector. Depending on the structure of the latest it may be possible to produce some unstable dark states at colliders.
Detector such as the ATLAS at the Large...