Publications (26)
Critical Points in Palatini Higgs Inflation with Small Non-Minimal Coupling
Arthur Poisson, Inar Timiryasov, Sebastian Zell
We investigate inflation driven by the Higgs boson in the Palatini formulation of General Relativity. Our analysis primarily focuses on a small non-minimal coupling of the Higgs fi…
An allowed window for heavy neutral leptons below the kaon mass
Kyrylo Bondarenko, Alexey Boyarsky, Juraj Klaric +4
The extension of the Standard Model with two gauge-singlet Majorana fermions can simultaneously explain two beyond-the-Standard-model phenomena: neutrino masses and oscillations, a…
Heavy Neutral Leptons -- Advancing into the PeV domain
Kevin A. UrquÃa-Calderón, Inar Timiryasov, Oleg Ruchayskiy
Heavy neutral leptons (HNLs) are hypothetical particles able to explain neutrino oscillations and provide a mechanism for generating the baryon asymmetry of the Universe. Quantum c…
Freeze-in and freeze-out generation of lepton asymmetries after baryogenesis in the MSM
Shintaro Eijima, Mikhail Shaposhnikov, Inar Timiryasov
The MSM -- an extension of the Standard Model by three relatively light singlet Majorana fermions -- allows for the generation of lepton asymmetry which is several…
Unleashing the full power of LHCb to probe Stealth New Physics
Martino Borsato, Xabier Cid Vidal, Yuhsin Tsai +38
In this paper, we describe the potential of the LHCb experiment to detect Stealth physics. This refers to dynamics beyond the Standard Model that would elude searches that focus on…
Einstein-Cartan Portal to Dark Matter
Mikhail Shaposhnikov, Andrey Shkerin, Inar Timiryasov +1
It is well-known since the works of Utiyama and Kibble that the gravitational force can be obtained by gauging the Poincaré group, which puts gravity on the same footing as the St…
To Positivity and Beyond, where Higgs-Dilaton Inflation has never gone before
Mario Herrero-Valea, Inar Timiryasov, Anna Tokareva
We study the consequences of (beyond) positivity of scattering amplitudes in the effective field theory description of the Higgs-Dilaton inflationary model. By requiring the EFT to…
Reconciling resonant leptogenesis and baryogenesis via neutrino oscillations
Juraj KlariÄ, Mikhail Shaposhnikov, Inar Timiryasov
Right-handed neutrinos offer an elegant solution to two well established phenomena beyond the Standard Model (SM) - masses and oscillations of neutrinos, as well as the baryon asym…
Uniting low-scale leptogeneses
Juraj KlariÄ, Mikhail Shaposhnikov, Inar Timiryasov
In this work we demonstrate that what was previously considered as different mechanisms of baryon asymmetry generation involving two right-handed Majorana neutrinos with masses far…
Einstein-Cartan gravity, matter, and scale-invariant generalization
Mikhail Shaposhnikov, Andrey Shkerin, Inar Timiryasov +1
We study gravity coupled to scalar and fermion fields in the Einstein-Cartan framework. We discuss the most general form of the action that contains terms of mass dimension not big…
Testing MSM with indirect searches
Dmitry Gorbunov, Inar Timiryasov
We consider neutrino Minimal extension of the Standard Model (MSM), which by introducing only three sterile neutrinos in sub electroweak region can explain active neutrino osci…
Building an AI-native Research Ecosystem for Experimental Particle Physics: A Community Vision
Thea Klaeboe Aarrestad, Alaa Abdelhamid, Haider Abidi +457
Experimental particle physics seeks to understand the universe by probing its fundamental particles and forces and exploring how they govern the large-scale processes that shape co…
Learning to detect continuous gravitational waves: an open data-analysis competition
Rodrigo Tenorio, Michael J. Williams, Joseph Bayley +29
We report results of a public data-analysis challenge, hosted on the open data-science platform Kaggle, to detect simulated continuous gravitational-wave signals (CWs). These are w…
Preheating in Palatini Higgs inflation on the lattice
Frédéric Dux, Adrien Florio, Juraj KlariÄ +2
We study preheating following Higgs inflation in the Palatini formulation of gravity. We numerically evolve perturbations of the radial mode of the Higgs field and that of three sc…
The Present and Future Status of Heavy Neutral Leptons
Asli M. Abdullahi, Pablo Barham Alzas, Brian Batell +42
The existence of non-zero neutrino masses points to the likely existence of multiple SM neutral fermions. When such states are heavy enough that they cannot be produced in oscillat…
Higgs inflation in Einstein-Cartan gravity
Mikhail Shaposhnikov, Andrey Shkerin, Inar Timiryasov +1
We study inflation driven by the Higgs field in the Einstein-Cartan formulation of gravity. In this theory, the presence of the Holst and Nieh-Yan terms with the Higgs field non-mi…
Projected NA62 sensitivity to heavy neutral lepton production in decays
Jean-Loup Tastet, Evgueni Goudzovski, Inar Timiryasov +1
Heavy neutral leptons (HNLs) appear in many extensions of the Standard Model of particle physics. In this study, we investigate to which extent the NA62 experiment at CERN could im…
Tree-level unitarity constraints on heavy neutral leptons
Kevin A. UrquÃa-Calderón, Inar Timiryasov, Oleg Ruchayskiy
Heavy neutral leptons (HNLs) can explain the origin of neutrino masses and oscillations over a wide range of masses. Direct experimental probes of HNLs become unfeasible for masses…
Dirac vs. Majorana HNLs (and their oscillations) at SHiP
Jean-Loup Tastet, Inar Timiryasov
SHiP is a proposed high-intensity beam dump experiment set to operate at the CERN SPS. It is expected to have an unprecedented sensitivity to a variety of models containing feebly…
Learning Standard Model structure from LHC data with Riemannian flow matching
Midori Kato, Kevin A. UrquÃa-Calderón, Inar Timiryasov +1
In this work we demonstrate that a single transformer-based generative model can capture Standard Model structure spanning five decades of invariant mass, from the sub-GeV regime t…
Why interpretation matters for BSM searches: a case study with Heavy Neutral Leptons at ATLAS
Jean-Loup Tastet, Oleg Ruchayskiy, Inar Timiryasov
Experiments searching for Heavy Neutral Leptons (HNLs) typically interpret their results within simplified models consisting of a single HNL coupled to a single lepton flavor. Howe…
Reinterpreting the ATLAS bounds on heavy neutral leptons in a realistic neutrino oscillation model
Jean-Loup Tastet, Oleg Ruchayskiy, Inar Timiryasov
Heavy neutral leptons (HNLs) are hypothetical particles, motivated in the first place by their ability to explain neutrino oscillations. Experimental searches for HNLs are typicall…
Probing baryon asymmetry of the Universe at LHC and SHiP
Iryna Boiarska, Kyrylo Bondarenko, Alexey Boyarsky +4
The origin of the baryon asymmetry of the Universe (BAU) is one of the major puzzles beyond the Standard Model. Detecting the particles responsible for the generation of the BAU wo…
Parameter space of baryogenesis in the MSM
Shintaro Eijima, Mikhail Shaposhnikov, Inar Timiryasov
The Standard Model accompanied with two right-handed neutrinos with the masses below the weak scale can explain the observed baryon asymmetry of the Universe. Moreover, this model…
BabyLlama-2: Ensemble-Distilled Models Consistently Outperform Teachers With Limited Data
Jean-Loup Tastet, Inar Timiryasov
We present BabyLlama-2, a 345 million parameter model distillation-pretrained from two teachers on a 10 million word corpus for the BabyLM competition. On BLiMP and SuperGLUE bench…
Baby Llama: knowledge distillation from an ensemble of teachers trained on a small dataset with no performance penalty
Inar Timiryasov, Jean-Loup Tastet
We present our submission to the BabyLM challenge, whose goal was to improve the sample efficiency of language models. We trained an ensemble consisting of a GPT-2 and small LLaMA…