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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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2025-08-14
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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2025-07-24
04:36
(Quadratically) Refined Discrete Anomaly Cancellation / Dierigl, Markus (CERN) ; Tartaglia, Michelangelo (CSIC, Madrid)
In this work we study the cancellation of non-perturbative anomalies of gravitational theories with gauge group $\mathbb{Z}_k$ in six dimensions. These subtle anomalies require a classification of deformation classes of manifolds with discrete gauge bundles known as bordism groups. [...]
arXiv:2504.02934; CERN-TH-2025-068; IFT-25-35.- 2025-08-19 - 44 p. - Published in : JHEP 2508 (2025) 145 Fulltext: 2504.02934 - PDF; document - PDF;

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2025-07-22
04:19
CP violation in $K\toμ^+μ^-$ with and without time dependence through a tagged analysis / D'Ambrosio, Giancarlo (INFN, Naples) ; Dery, Avital (CERN) ; Grossman, Yuval (Cornell U., LEPP) ; Kitahara, Teppei (Chiba U. ; KMI, Nagoya ; Nagoya U.) ; Marchevski, Radoslav (EPFL, Lausanne, LPPC) ; Martínez Santos, Diego (U. A Coruna) ; Schacht, Stefan (Durham U., IPPP)
We point out that using current knowledge of ${\cal B}(K^0_L\toμ^+μ^-)$ and $ {\cal B}(K^0_L\to γγ)$, one can extract short-distance information from the combined measurement of the time-integrated CP asymmetry, $A_{\rm CP}(K^0\toμ^+μ^-)$, and of ${\cal B}(K^0_S\toμ^+μ^-)$. We discuss the interplay between this set of observables, and demonstrate that determining ${\rm sign}[A_{\rm CP}(K^0\toμ^+μ^-)]$ would eliminate the discrete ambiguity in the Standard Model prediction for ${\cal B}(K^0_L\toμ^+μ^-)$. [...]
arXiv:2507.13445; CERN-TH-2025-047; CHIBA-EP-272; IPPP/25/46.- 2025-09-24 - 26 p. - Published in : JHEP 2509 (2025) 190 Fulltext: 2507.13445 - PDF; document - PDF;

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2025-07-22
04:19
Perfect spinfluid: A divergence-type approach / Abboud, Nick (Illinois U., Urbana) ; Gavassino, Lorenzo (Vanderbilt U. (main) ; Vanderbilt U.) ; Singh, Rajeev (West Timisoara U.) ; Speranza, Enrico (CERN ; Florence U.)
We present a new formulation of non-dissipative relativistic spin hydrodynamics that incorporates spin degrees of freedom into the divergence-type theory framework. Due to the divergence-type structure, it is straightforward to enforce non-linear causality and symmetric hyperbolicity of the equations of motion, ensuring local well-posedness of the initial-value problem and stability of the theory. [...]
arXiv:2506.19786; CERN-TH-2025-121.- 2025-11-21 - 16 p. - Published in : Phys. Rev. D 112 (2025) 094043 Fulltext: PDF;

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2025-07-17
04:10
Towards NNLO QCD predictions for off-shell top-quark pair production and decays / Buonocore, Luca (CERN) ; Grazzini, Massimiliano (Zurich U.) ; Kallweit, Stefan (Zurich U.) ; Lindert, Jonas M. (Sussex U.) ; Savoini, Chiara (Munich, Tech. U.)
We consider QCD radiative corrections to $W^+W^-b {\bar b}$ production with leptonic decays and massive bottom quarks at the LHC. We perform an exact next-to-leading order (NLO) calculation within the $q_T$-subtraction formalism and validate it against an independent computation in the dipole subtraction scheme. [...]
arXiv:2507.11410; ZU-TH-47/25; TUM-HEP-1565/25; CERN-TH-2025-130.- 2025 - 85 p. - Published in : JHEP 2510 (2025) 195 Fulltext: 2507.11410 - PDF; document - PDF;

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