Zobrazeno 1 - 10
of 359
pro vyhledávání: '"Schwetz, Thomas"'
e 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 syste
Externí odkaz:
http://arxiv.org/abs/2411.00931
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
Externí odkaz:
http://arxiv.org/abs/2411.00892
We consider an extended seesaw model which generates active neutrino masses via the usual type-I seesaw and leads to a large number of massless fermions as well as a sterile neutrino dark matter (DM) candidate in the $\mathcal{O}(10-100) {\rm~keV}$ m
Externí odkaz:
http://arxiv.org/abs/2410.23926
Autor:
Esteban, Ivan, Gonzalez-Garcia, M. C., Maltoni, Michele, Martinez-Soler, Ivan, Pinheiro, João Paulo, Schwetz, Thomas
We present an updated global analysis of neutrino oscillation data as of September 2024. The parameters $\theta_{12}$, $\theta_{13}$, $\Delta m^2_{21}$, and $|\Delta m^2_{3\ell}|$ ($\ell = 1,2$) are well-determined with relative precision at $3\sigma
Externí odkaz:
http://arxiv.org/abs/2410.05380
We consider the time reversal (T) transformation in neutrino oscillations in a model-independent way by comparing the observed transition probabilities at two different baselines at the same neutrino energy. We show that, under modest model assumptio
Externí odkaz:
http://arxiv.org/abs/2408.06419
Models of inelastic (or pseudo-Dirac) dark matter commonly assume an accidental symmetry between the left-handed and right-handed mass terms in order to suppress diagonal couplings. We point out that this symmetry is unnecessary, because for Majorana
Externí odkaz:
http://arxiv.org/abs/2405.08081
Autor:
Schwetz, Thomas, Todarello, Elisa
In this note we refute the critique raised in a preprint by J.~Berger and A.~Bhoonah~\cite{Berger:2023muj} on the method used in our earlier paper, Beutter et al.~\cite{Beutter:2018xfx}, to calculate the electromagnetic fields induced by an axion bac
Externí odkaz:
http://arxiv.org/abs/2401.16909
The rare decays $B^+\to K^+ \mu\bar \mu$ and $B^0\to K^{*0} \mu\bar\mu$ provide the strongest constraints on the mixing of a light scalar with the Higgs boson for GeV-scale masses. The constraints sensitively depend on the branching ratio to muons. A
Externí odkaz:
http://arxiv.org/abs/2306.09508
Autor:
Farzan, Yasaman, Schwetz, Thomas
Gallium radioactive source experiments have reported a neutrino-induced event rate about 20\% lower than expected with a high statistical significance. We present an explanation of this observation assuming quantum decoherence of the neutrinos in the
Externí odkaz:
http://arxiv.org/abs/2306.09422
Autor:
Krueger, Raphael, Schwetz, Thomas
We adopt the quantum field theoretical method to calculate the amplitude and event rate for a neutrino oscillation experiment, considering neutrino production, propagation and detection as a single process. This method allows to take into account dec
Externí odkaz:
http://arxiv.org/abs/2303.15524