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Observation of collider neutrinos without final state muons with the SND@LHC experiment
LHC Collaboration
We report the observation of neutrino interactions without final state muons at the LHC, with a significance of 6.4. A data set of proton-proton collisions at …
Dynamics of metastable Standard Model particles from long-lived particle decays in the MeV primordial plasma
Kensuke Akita, Gideon Baur, Maksym Ovchynnikov +2
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 deca…
New physics decaying into metastable particles: impact on cosmic neutrinos
Kensuke Akita, Gideon Baur, Maksym Ovchynnikov +2
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…
Primordial neutrinos and new physics: novel approach to solving neutrino Boltzmann equation
Maksym Ovchynnikov, Vsevolod Syvolap
Understanding how new physics influences the dynamics of cosmic neutrinos during their decoupling is crucial in light of upcoming precise cosmological observations and the need to…
Searches for long-lived dark photons at proton accelerator experiments
Yehor Kyselov, Maksym Ovchynnikov
A systematic and unified analysis of the capability of lifetime frontier experiments to probe the parameter space of hypothetical long-lived particles is crucial for defining the t…
How new physics affects primordial neutrinos decoupling: Direct Simulation Monte Carlo approach
Maksym Ovchynnikov, Vsevolod Syvolap
Cosmological observations from Big Bang Nucleosynthesis and the Cosmic Microwave Background (CMB) offer crucial insights into the Early Universe, enabling us to trace its evolution…
Reconstruction of 400 GeV/c proton interactions with the SHiP-charm project
SHiP Collaboration
The SHiP-charm project was proposed to measure the associated charm production induced by 400 GeV/c protons in a thick target, including the contribution from cascade production. A…
Not-so-inelastic Dark Matter
Giovani Dalla Valle Garcia, Felix Kahlhoefer, Maksym Ovchynnikov +1
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…