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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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2025-10-21
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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2025-09-12
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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2025-08-21
06:09
Data-driven analyses and model-independent fits for present $b\to s \ell \ell$ results / Hurth, Tobias (U. Mainz, PRISMA) ; Mahmoudi, Farvah (IP2I, Lyon ; CERN ; IUF, Paris) ; Monceaux, Yann (IP2I, Lyon) ; Neshatpour, Siavash (IP2I, Lyon)
We present a critical assessment of the present $B$ anomalies in the exclusive $b \to s \ell\ell$ mode based on the QCD factorisation (QCDf) approach. In particular, we analyse the impact of different local form factor calculations and of the largest bin in the low-$q^2$ region. [...]
arXiv:2508.09986; CERN-TH-2025-164; MITP/25-055.- 2025-12-01 - 37 p. - Published in : Phys. Rev. D 112 (2025) 113003 Fulltext: 2508.09986 - PDF; document - PDF;

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2025-08-21
06:01
Deformations of Starobinsky Inflation in No-Scale SU(5) and SO(10) GUTs / Ellis, John (King's Coll. London ; CERN) ; García, Marcos A.G. (Mexico U.) ; Nagata, Natsumi (Tokyo U.) ; Nanopoulos, Dimitri V. (CERN ; Athens Academy ; Texas A-M) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.)
The original Starobinsky $R + R^2$ model of inflation is consistent with Planck and other measurements of the CMB, but recent results from the ACT and SPT Collaborations hint that the tilt of scalar perturbations may be in tension with the prediction of the Starobinsky model. No-scale models of inflation can reproduce the predictions of the Starobinsky model, but also provide a framework for incorporating deformations that could accommodate more easily the ACT and SPT data. [...]
arXiv:2508.13279; FTPI–MINN–25/07; UMN–TH–4501/25; FTPI-MINN-25/07; UMN-TH-4501/25; KCL-PH-TH/2025-36; CERN-TH-2025-160.- 2025-12-16 - 37 p. - Published in : JCAP 2512 (2025) 038 Fulltext: 2508.13279 - PDF; document - PDF;

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2025-08-14
05:01
Precision calculation of $N_{\text{eff}}$ with Neutrino Direct Simulation Monte Carlo / Ihnatenko, Oleksii (Taras Shevchenko U.) ; Ovchynnikov, Maksym (CERN)
Neutrino Direct Simulation Monte Carlo ($ν$DSMC) is a Monte Carlo method for solving the neutrino Boltzmann equation in the early Universe, designed to track the evolution of cosmic neutrinos across a wide range of cosmological scenarios. We develop a complete $ν$DSMC solver that consistently incorporates the effects of the electron mass, three-flavour neutrino oscillations, and finite-temperature QED corrections to the thermodynamics of the electromagnetic plasma. [...]
arXiv:2508.08379; CERN-TH-2025-158.- 2025-11-15 - 13 p. - Published in : Phys. Rev. D 112 (2025) 103543 Fulltext: 2508.08379 - PDF; document - PDF;

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2025-07-25
04:07
Thermal modifications of mesons and energy-energy correlators from real-time simulations of a $U(1)$ lattice gauge theory / Barata, João (CERN) ; Frenklakh, David (Brookhaven) ; Mukherjee, Swagato (Brookhaven)
We investigate thermal properties of a $U(1)$ lattice gauge theory in $1+1$-dimensions through real-time simulations. We extract the spectral functions directly coupling to the pseudoscalar and scalar mesons, demonstrating the thermal modifications of these states with increasing temperatures. [...]
arXiv:2507.16890; CERN-TH-2025-133.- 2025-12-01 - 10 p. - Published in : Phys. Rev. D 112 (2025) 114505 Fulltext: 2507.16890 - PDF; document - PDF;

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2025-07-24
04:52
Gravitational Wave Scattering on Magnetic Fields / Domcke, Valerie (CERN) ; Garcia-Cely, Camilo (Valencia U., IFIC) ; Lee, Sung Mook (CERN)
The conversion of gravitational to electromagnetic waves in the presence of background magnetic fields is known as the inverse Gertsenshtein effect, analogous to the Primakoff effect for axions. Rephrasing this conversion as a classical electrodynamics problem in the far-field regime of a magnetized region, we derive the angular distribution of the intensity and polarization of the emitted electromagnetic waves. [...]
arXiv:2507.16609; CERN-TH-2025-142.- 2025 - 47 p. - Published in : JCAP 2511 (2025) 016 Fulltext: 2507.16609 - PDF; document - PDF;

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2025-07-24
04:36
Symmetry energy dependence of the bulk viscosity of nuclear matter / Yang, Yumu (Illinois U., Urbana) ; Hippert, Mauricio (Rio de Janeiro, CBPF ; Rio de Janeiro State U.) ; Speranza, Enrico (CERN) ; Noronha, Jorge (Illinois U., Urbana)
We clarify how the weak-interaction-driven bulk viscosity $ζ$ and the bulk relaxation time $τ_Π$ of neutrino-transparent $npe$ matter depend on the nuclear symmetry energy. We show that, at saturation density, the equation-of-state dependence of these transport quantities is fully determined by the experimentally constrained nuclear symmetry energy $S$ and its slope $L$. [...]
arXiv:2504.07805; CERN-TH-2025-078.- 2025-11-25 - 7 p. - Published in : Phys. Rev. Lett. 135 (2025) 222702 Fulltext: PDF;

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