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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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2025-09-04
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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2025-08-23
04:15
Spin versus nonstabilizerness in gluon and graviton scattering / Gargalionis, John (Adelaide U., Sch. Chem. Phys. ; ARC, CoEDMPP, Australia) ; Moynihan, Nathan (Queen Mary, U. of London) ; Trifinopoulos, Sokratis (CERN ; Zurich U.) ; Wallace, Ewan N.V. (Adelaide U., Sch. Chem. Phys. ; ARC, CoEDMPP, Australia) ; White, Chris D. (Queen Mary, U. of London) ; White, Martin J. (Adelaide U., Sch. Chem. Phys. ; ARC, CoEDMPP, Australia)
The quantum property of non-stabiliserness, also known as magic, plays a key role in designing quantum computing systems. How to produce, manipulate and enhance magic remains mysterious, such that concrete examples of physical systems that manifest magic behaviour are sought after. [...]
arXiv:2508.14967; CERN-TH-2025-166; ADP-25-30/T1292.- 2026-01-01 - 28 p. - Published in : Phys. Rev. D 113 (2026) 016007 Fulltext: 2508.14967 - 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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2025-08-02
04:49
One-Loop Calculations in Effective Field Theories with GoSam-3.0 / Braun, Jens (KIT, Karlsruhe, TP) ; Campillo Aveleira, Benjamin (KIT, Karlsruhe, TP) ; Heinrich, Gudrun (KIT, Karlsruhe, TP) ; Höfer, Marius (KIT, Karlsruhe, TP) ; Jones, Stephen P. (Durham U., IPPP) ; Kerner, Matthias (KIT, Karlsruhe, TP) ; Lang, Jannis (KIT, Karlsruhe, TP) ; Magerya, Vitaly (CERN)
We present a major update of the one-loop generator GoSam, containing performance improvements as well as new features, in particular functionalities that facilitate calculations beyond the Standard Model in Effective Field Theory frameworks..
arXiv:2507.23549; KA-TP-21-2025; P3H-25-051; IPPP/25/50; CERN-TH-2025-134.- 2026-01-09 - 23 p. - Published in : SciPost Phys. Codeb. 62 (2026) 1 Fulltext: 2507.23549 - PDF; document - PDF;

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