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2026-01-17
07:04
Resonant Landau-Zener conversion in multi-axion systems / Dunsky, David I. (New York U., CCPP) ; Manzari, Claudio Andrea (UC, Berkeley ; LBL, Berkeley) ; Quílez, Pablo (UC, San Diego ; CERN) ; Ramos, Maria (CERN) ; Sørensen, Philip (U. Padua, Dept. Phys. Astron. ; INFN, Padua)
Multiple axions may emerge in the low-energy effective theory of Nature. Generically, the potentials describing these axion fields are non-diagonal, leading to mass mixing between axion states which can be temperature-dependent due to QCD instanton effects. [...]
arXiv:2507.06287; CERN-TH-2025-131.- 2026-01-12 - 10 p. - Published in : JHEP 2601 (2026) 077 Fulltext: 2507.06287 - PDF; document - PDF;

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2025-11-21
04:10
The quark jet function for $k_T$-like variables in NNLO QCD / Buonocore, Luca (CERN) ; Grazzini, Massimiliano (Zurich U.) ; Guadagni, Flavio (Zurich U.) ; Haag, Jürg (U. Bern, AEC) ; Rottoli, Luca (Milan Bicocca U. ; INFN, Milan Bicocca)
The precise description of jet processes requires observables capable of efficiently capturing the dynamics of the energy flow in hadronic final states. We consider a class of tranverse-momentum like resolution variables that smoothly describe the $n+1$ to $n$ jet transition in multi-jet processes. [...]
arXiv:2508.19226; ZU-TH 54/25; CERN-TH-2025-167.- 2025-11-12 - 20 p. - Published in : Eur. Phys. J. C 85 (2025) 1290 Fulltext: document - PDF; 2508.19226 - PDF;

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2025-11-04
04:14
Towards a topological data analysis for heavy-ion collisions / Capellino, Federica (Darmstadt, GSI) ; Dubla, Andrea (Darmstadt, GSI) ; Masciocchi, Silvia (Darmstadt, GSI ; Heidelberg U.) ; Nijs, Govert (CERN) ; Spitz, Daniel (Leipzig, Max Planck Inst.)
The collective expansion of the quark-gluon plasma (QGP) created in heavy-ion collisions suggests that geometry-inspired approaches can be useful in extracting information about the QGP. In this work, a systematic study of observables based on topological data analysis is provided for simulations of heavy-ion collisions. [...]
arXiv:2509.02339; CERN-TH-2025-168.- 2025-11-25 - 15 p. - Published in : Phys. Rev. C 112 (2025) 054909 Fulltext: 2509.02339 - PDF; document - PDF;

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2025-11-04
04:07
Can galactic magnetic fields diffuse into the voids? / Ghosh, Oindrila (Stockholm U., OKC) ; Brandenburg, Axel (Royal Inst. Tech., Stockholm ; Stockholm U., OKC ; Carnegie Mellon U. ; Ilia State U.) ; Caprini, Chiara (CERN ; U. Geneva (main)) ; Neronov, Andrii (APC, Paris ; LASTRO Observ.) ; Vazza, Franco (U. Bologna, DIFA)
Cosmic voids are magnetized at the level of at least $10^{-17}$ G on Mpc scales, as implied by blazar observations. We show that an electrically conducting plasma is present in the voids, and that, because of the plasma, \emph{diffusion} into the voids of galactic fields generated by a mean-field dynamo is far too slow to explain the present-day void magnetization. [...]
arXiv:2510.26918; NORDITA-2025-055; CERN-TH-2025-219.- 2026-01-15 - 14 p. - Published in : Phys. Rev. D Fulltext: PDF;

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2025-10-21
04:04
Effects of Radiative Corrections on Starobinsky Inflation / Ellis, John (King's Coll. London ; CERN) ; Gherghetta, Tony (U. Minnesota, Minneapolis (main)) ; Kaneta, Kunio (Niigata U. (main)) ; Ke, Wenqi (U. Minnesota, Minneapolis (main)) ; Olive, Keith A. (U. Minnesota, Minneapolis (main))
We analyze radiative corrections to the Starobinsky model of inflation arising from self-interactions of the inflaton, and from its Yukawa couplings, $y$, to matter fermions, and dimensionful trilinear couplings, $κ$, to scalar fields, which could be responsible for reheating the Universe after inflation. The inflaton self-interactions are found to be of higher order in the Hubble expansion rate during inflation, and hence unimportant for CMB observations. [...]
arXiv:2510.15137; UMN-TH-4511/25; FTPI-MINN-25/13; KCL-PH-TH/2025-39; CERN-TH-2025-198.- 2025-12-15 - 15 p. - Published in : Phys. Rev. D 112 (2025) 123530 Fulltext: 2510.15137 - PDF; document - PDF;

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2025-10-07
04:23
A Limit on the Total Lepton Number in the Universe from BBN and the CMB / Domcke, Valerie (CERN) ; Escudero, Miguel (CERN) ; Fernandez Navarro, Mario (Glasgow U.) ; Sandner, Stefan (Los Alamos)
At temperatures below the QCD phase transition, any substantial lepton number in the Universe can only be present within the neutrino sector. In this work, we systematically explore the impact of a non-vanishing lepton number on Big Bang Nucleosynthesis (BBN) and the Cosmic Microwave Background (CMB). [...]
arXiv:2510.02438; CERN-TH-2025-192; LA-UR-25-29666.- 2026 - 24 p. - Published in : JCAP 2602 (2026) 017 Fulltext: 2510.02438 - PDF; document - PDF;

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2025-09-27
04:05
Geometric Building Blocks of Effective Field Theory Amplitudes / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Li, Xu-Xiang (U. Utah, Salt Lake City) ; Zhang, Zhengkang (U. Utah, Salt Lake City)
On-shell amplitudes are invariant under field redefinitions. Nonderivative field redefinitions have a natural interpretation as coordinate transformations on the target manifold. [...]
arXiv:2509.20449; CERN-TH-2025-188.- 2026-02-05 - 49 p. - Published in : JHEP 2602 (2026) 076 Fulltext: 2509.20449 - PDF; document - PDF;

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2025-09-12
04:31
Affleck-Dine Leptoflavorgenesis / Akita, Kensuke (Tokyo U.) ; Hamaguchi, Koichi (Tokyo U.) ; Ovchynnikov, Maksym (CERN)
We propose a scenario to produce large primordial lepton flavor asymmetries with vanishing total lepton asymmetry, based on the Affleck-Dine mechanism with Q-ball formation. This scenario can produce large lepton flavor asymmetries while automatically maintaining the vanishing total lepton number without fine-tuning, evading the current BBN and the CMB constraints by neutrino oscillations at MeV temperature. [...]
arXiv:2509.08175; CERN-TH-2025-185.- 2025-12-18 - 15 p. - Published in : JHEP 2512 (2025) 142 Fulltext: 2509.08175 - PDF; document - PDF;

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2025-09-09
04:29
Axion lines from nuclear de-excitations in galactic stellar populations / Ning, Orion (UC, Berkeley ; LBL, Berkeley) ; Ray, Anupam (UC, Berkeley) ; Safdi, Benjamin R. (UC, Berkeley ; LBL, Berkeley ; CERN)
We show that mono-energetic axions are produced in abundance through nuclear de-excitations in nearby galaxies such as M87, which is the central galaxy of the Virgo cluster, and the starburst galaxy M82. If the axion couples to both nucleons and photons and is ultralight, then monochromatic hard X-ray signatures are induced by the subsequent axion-to-photon conversion in the magnetic fields permeating these systems. [...]
arXiv:2509.03569; CERN-TH-2025-162; N3AS-25-014.- 2026-02-01 - 17 p. - Published in : Phys. Rev. D 113 (2026) 035010 Fulltext: PDF;

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2025-09-04
04:22
Herwig 7 with the Lund String Model: Tuning and Comparative Hadronization Studies / Divisova, Michaela (Prague, Tech. U.) ; Myska, Miroslav (Prague, Tech. U.) ; Sarmah, Pratixan (Jagiellonian U. (main)) ; Siódmok, Andrzej (Jagiellonian U. (main) ; CERN)
The modelling of the formation of colour-singlet hadrons from coloured partons, known as Hadronization, is crucial for generating realistic events in Monte Carlo Event Generators. Due to limited understanding of the non-perturbative regime, physically motivated phenomenological hadronization models with tunable parameters are used and later tuned to the experimental data. [...]
arXiv:2509.02348; CERN-TH-2025-179; MCNET-25-22.- 2026-01-04 - 29 p. - Published in : Eur. Phys. J. C 86 (2026) 3 Fulltext: 2509.02348 - PDF; document - PDF;

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