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1.
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New physics decaying into metastable particles: impact on cosmic neutrinos
/ Akita, Kensuke (Tokyo U.) ; Baur, Gideon (KIT, Karlsruhe, IAP ; U. Bonn, Phys. Inst., BCTP) ; Ovchynnikov, Maksym (KIT, Karlsruhe, IAP ; CERN) ; Schwetz, Thomas (KIT, Karlsruhe, IAP) ; Syvolap, Vsevolod (Leiden U.)
We investigate decays of hypothetical unstable new physics particles into metastable species such as muons, pions, or kaons in the Early Universe, when temperatures are in the MeV range, and study how they affect cosmic neutrinos. We demonstrate that the non-trivial dynamics of metastables in the plasma alters the impact of the new physics particles on the neutrino population, including the effective number of neutrino degrees of freedom, $N_{\rm eff}$, modifies neutrino spectral distortions, and may induce asymmetries in neutrino and antineutrino energy distributions. [...]
arXiv:2411.00892; CERN-TH-2024-188; CERN-TH-2024-188.-
2025-03-24 - 6 p.
- Published in : Phys. Rev. Lett.
Fulltext: PDF;
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2.
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Dynamics of metastable Standard Model particles from long-lived particle decays in the MeV primordial plasma
/ Akita, Kensuke (Tokyo U.) ; Baur, Gideon (KIT, Karlsruhe, IAP ; U. Bonn, Phys. Inst., BCTP) ; Ovchynnikov, Maksym (KIT, Karlsruhe, IAP ; CERN) ; Schwetz, Thomas (KIT, Karlsruhe, IAP) ; Syvolap, Vsevolod (Leiden U.)
We investigate the cosmological impact of hypothetical unstable new physics particles that decay in the MeV-scale plasma of the Early Universe. Focusing on scenarios where the decays produce metastable species such as muons, pions, and kaons, we systematically analyze the dynamics of these particles using coupled Boltzmann equations governing their abundances. [...]
arXiv:2411.00931; CERN-TH-2024-189; CERN-TH-2024-189.-
2025-03-15 - 17 p.
- Published in : Phys. Rev. D
Fulltext: PDF;
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3.
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A seesaw model for large neutrino masses in concordance with cosmology
/ Escudero, Miguel (CERN) ; Schwetz, Thomas (KIT, Karlsruhe, IAP) ; Terol-Calvo, Jorge (IAC, La Laguna ; Laguna U., Tenerife)
Cosmological constraints on the sum of the neutrino masses can be relaxed if the number density of active neutrinos is reduced compared to the standard scenario, while at the same time keeping the effective number of neutrino species $N_{\rm eff}\approx 3$ by introducing a new component of dark radiation. We discuss a UV complete model to realise this idea, which simultaneously provides neutrino masses via the seesaw mechanism. [...]
arXiv:2211.01729; CERN-TH-2022-180.-
2023-02-14 - 20 p.
Fulltext: Addendum - PDF; document - PDF; 2211.01729 - PDF; Publication - PDF;
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4.
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Search for dark photons as candidates for Dark Matter with FUNK
/ Andrianavalomahefa, Arnaud (KIT, Karlsruhe) ; Daumiller, Kai (KIT, Karlsruhe) ; Döbrich, Babette (CERN) ; Engel, Ralph (KIT, Karlsruhe) ; Jaeckel, Joeg (U. Heidelberg, ITP) ; Kowalski, Marek (Humboldt U., Berlin ; DESY, Zeuthen) ; Lindner, Axel (DESY, Zeuthen) ; Mathes, Hermann-Josef (KIT, Karlsruhe) ; Redondo, Javier (Zaragoza U.) ; Roth, Markus (KIT, Karlsruhe) et al.
An additional U(1) symmetry predicted in theories beyond the Standard Model of particle physics can give rise to hidden (dark) photons. Depending on the mass and density of these hidden photons, they could account for a large fraction of the Dark Matter observed in the Universe. [...]
2021 - 8 p.
- Published in : PoS ICRC2019 (2019) 517
Fulltext: PDF;
In : 36th International Cosmic Ray Conference, Madison, WI, USA, 24 Jul - 1 Aug 2019, pp.517
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5.
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Global Analysis of 3 Flavour Neutrino Oscillations
/ Esteban, Ivan (Barcelona U.) ; Gonzalez-Garcia, M C (Barcelona U. ; ICREA, Barcelona ; YITP, Stony Brook) ; Hernandez-Cabezudo, Alvaro (KIT, Karlsruhe, IKP) ; Maltoni, Michele (Madrid, IFT) ; Schwetz, Thomas (KIT, Karlsruhe, IKP)
In this talk I presented the main results of the latest global analysis of the three-flavour neutrino oscillations performed by the NuFit collaboration, which is focused on the study of the complementarity and tension among the neutrino oscillation experimental data, available as of fall 2018, in the determination of θ$_{23}$ and δ$_{CP}$ parameters and the mass ordering. A tabulated Δχ$^{2}$ of the Super-Kamiokande atmospheric neutrino data analysis within the same oscillation framework, provided by the collaboration, is added to the global analysis. [...]
2019 - 6 p.
- Published in : (2019) , pp. 157-162
In : 54th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 16 - 23 Mar 2019, pp.157-162
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6.
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7.
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Future Opportunities in Accelerator-based Neutrino Physics
/ Dell'Acqua, Andrea (CERN) ; Aduszkiewicz, Antoni (Warsaw U.) ; Ahlers, Markus (Bohr Inst.) ; Aihara, Hiroaki (Tokyo U.) ; Alion, Tyler (Sussex U.) ; Alonso Monsalve, Saul (CERN) ; Ruso, Luis Alvarez (Valencia U., IFIC) ; Antonelli, Vito (INFN, Milan Bicocca ; Milan U.) ; Babicz, Marta (CERN ; Warsaw, Inst. Math.) ; Barbano, Anastasia Maria (Geneva U.) et al.
This document summarizes the conclusions of the Neutrino Town Meeting held at CERN in October 2018 to review the neutrino field at large with the aim of defining a strategy for accelerator-based neutrino physics in Europe. [...]
arXiv:1812.06739 ; FERMILAB-CONF-18-688-ND.
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2018 - 16.
Fermilab Library Server (fulltext available) - Full text - Fulltext
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8.
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9.
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Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos
/ Dentler, Mona (Mainz U., Inst. Phys. ; U. Mainz, PRISMA) ; Hernández-Cabezudo, Álvaro (KIT, Karlsruhe, IKP) ; Kopp, Joachim (Mainz U., Inst. Phys. ; U. Mainz, PRISMA ; CERN) ; Machado, Pedro A.N. (Fermilab) ; Maltoni, Michele (Madrid, IFT) ; Martinez-Soler, Ivan (Madrid, IFT) ; Schwetz, Thomas (KIT, Karlsruhe, IKP)
We discuss the possibility to explain the anomalies in short-baseline neutrino oscillation experiments in terms of sterile neutrinos. We work in a 3+1 framework and pay special attention to recent new data from reactor experiments, IceCube and MINOS+. [...]
arXiv:1803.10661; MITP-18-023; IFT-UAM-CSIC-18-033; MITP/18-023; FERMILAB-PUB-18-086-T; IFT-UAM/CSIC-18-033.-
2018-08-03 - 32 p.
- Published in : JHEP 08 (2018) 010
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: 1803.10661 - PDF; arXiv:1803.10661 - PDF; fermilab-pub-18-086-t - PDF; External link: Fermilab Library Server (fulltext available)
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10.
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Phenomenology of future neutrino oscillation experiments
/ Schwetz, Thomas (Heidelberg, Max Planck Inst.)
give a brief overview of the phenomenology related to the measurements of the last unknown lepton mixing angle !13, CP violation (CPV) in neutrino os- cillations, and the neutrino mass hierarchy (MH). Sensitivities of upcoming reactor and accelerator experiments to !13 are discussed, showing that within a few years values of sin2 2!13 ! 10−2 will be probed, while CPV andMH mea- surements will be very difÞcult with that generation of experiments. [...]
Geneva : CERN, 2010 - 10 p.
Published version from CERN: PDF;
In : European Strategy for Future Neutrino Physics, pp.75-84
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