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TH Preprints

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2026-04-11
05:08
Lattice determination of the higher-order hadronic vacuum polarization contribution to the muon $g-2$ / Beltran, Arnau (U. Mainz, PRISMA) ; Conigli, Alessandro (Mainz U., Inst. Phys. ; Darmstadt, GSI) ; Kuberski, Simon (CERN) ; Meyer, Harvey B. (U. Mainz, PRISMA ; Mainz U., Inst. Phys. ; CERN) ; Ottnad, Konstantin (U. Mainz, PRISMA ; Bonn U., HISKP) ; Wittig, Hartmut (U. Mainz, PRISMA ; Mainz U., Inst. Phys. ; Darmstadt, GSI)
We present the first lattice QCD calculation of the next-to-leading order (NLO) hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment with sub-percent precision. [...]
arXiv:2604.08351 ; MITP-26-017 ; CERN-TH-2026-080. - 10.
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2026-04-10
04:19
A first study of strong isospin breaking effects in lattice QCD using truncated polynomials / Albandea, David (Helmholtz Inst., Mainz ; Darmstadt, GSI) ; Kuberski, Simon (CERN) ; Panadero, Fernando P. (Madrid, IFT)
Computing derivatives of observables with respect to parameters of the theory is a powerful tool in lattice QCD, as it allows the study of physical effects not directly accessible in the original Monte Carlo simulation. [...]
arXiv:2603.24420 ; MITP-26-015 ; CERN-TH-2026-059 ; IFT-UAM/CSIC-26-38. - 10.
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2026-04-09
07:55
Influence of tides and self-gravity on Ultra-Light Dark Matter Bounds from Dwarf Galaxies / Caputo, Andrea (CERN ; Weizmann Inst. ; U. Rome La Sapienza (main) ; INFN, Rome) ; Teodori, Luca (IAC, La Laguna ; Laguna U., Tenerife)
Dwarf spheroidal galaxies provide some of the most sensitive astrophysical probes of ultra-light dark matter (ULDM), but the inferred constraints can be affected by two important systematics: tidal interactions with the Milky Way, which reduce ULDM-induced dynamical heating, and stellar self-gravity, which can become relevant if the stellar component was more compact at earlier times. [...]
arXiv:2604.01278 ; CERN-TH-2026-065. - 18.
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2026-04-09
05:02
Comments on Symmetry Operators, Asymptotic Charges and Soft Theorems / Tizzano, Luigi (CERN)
We study the relation between emergent 1-form symmetries and soft photon theorems in QED. [...]
CERN-TH-2026-083 ; arXiv:2604.06088. - 8.
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2026-04-08
05:08
Simulating Axion Electrodynamics in Magnetized Plasmas: Energy transfer in the inhomogeneous and strongly varying limit / Corelli, Fabrizio (U. Rome La Sapienza (main) ; Potsdam, Max Planck Inst. ; INFN, Rome) ; Ginés, Estanis Utrilla (Valencia U., IFIC) ; Cannizzaro, Enrico (Lisbon, CENTRA ; IST, Lisbon (main)) ; Caputo, Andrea (U. Rome La Sapienza (main) ; CERN ; Weizmann Inst. ; INFN, Rome) ; Witte, Samuel J. (Oxford U., Theor. Phys. ; DESY ; Hamburg U., Inst. Theor. Phys. II)
In this work we study the electromagnetic response induced by axions in a magnetized plasma, focusing specifically on characterizing energy transfer and energy losses from the ambient axion field in highly inhomogeneous and strongly varying backgrounds. [...]
DESY-26-046 ; CERN-TH-2026-069 ; arXiv:2603.26868. - 37.
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2026-04-04
04:27
Fluid perturbations from expanding bubbles in first-order phase transitions / Caprini, Chiara (Geneva U., Dept. Theor. Phys. ; CERN) ; Midiri, Antonino S. (Geneva U., Dept. Theor. Phys.) ; Procacci, Simona (Geneva U., Dept. Theor. Phys.) ; Roper Pol, Alberto (Geneva U., Dept. Theor. Phys.)
We study the power spectrum of the velocity field induced during a first-order phase transition occurring in the radiation-dominated era. [...]
CERN-TH-2026-081 ; arXiv:2604.02240. - 85.
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2026-04-03
05:03
Searching for New Physics Inside Jets with the Herwig 7 Generalised Parton Shower / Kim, Taehee (Seoul Natl. U. (main)) ; Lee, Joon-Bin (Seoul Natl. U. (main)) ; Masouminia, M.R. (Durham U. (main)) ; Seymour, Michael H. (Manchester U. ; CERN) ; Yang, Un-ki (Seoul Natl. U. (main))
This study investigates parton shower evolution incorporating both Standard Model (SM) and beyond-the-Standard-Model (BSM) radiation, focusing on the phenomenology of a massive $Z'$ boson. [...]
CERN-TH-2026-074 ; MCnet-26-05 ; IPPP-26-15 ; arXiv:2604.00617. - 27.
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2026-04-03
05:00
A Pati-Salam realization of the Nelson-Barr mechanism / Murgui, Clara (CERN)
We present a UV completion of the Standard Model in which quarks and leptons are unified under color SU(4). [...]
CERN-TH-2026-033 ; arXiv:2604.00166. - 15.
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2026-04-02
04:05
Baryogenesis from Exploding Primordial Black Holes / Klipfel, Alexandra P. (MIT) ; Vanvlasselaer, Miguel (Brussels U., IIHE ; U. Barcelona (main)) ; Trifinopoulos, Sokratis (MIT ; CERN ; Zurich U.) ; Kaiser, David I. (MIT)
Exploding primordial black holes can source baryon asymmetry soon after the electroweak phase transition, as high-energy Hawking radiation drives ultrarelativistic shocks in the surrounding plasma. [...]
arXiv:2603.29024 ; MIT-CTP/6015 ; CERN-TH-2026-078. - 15.
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2026-04-01
04:34
Two-Loop Spacelike Splitting Amplitudes in Full-Color QCD / Buccioni, Federico (CERN) ; Fang, Hanyu (Shanghai Jiaotong U. ; KLPAC, Shanghai) ; Yan, Kai (Shanghai Jiaotong U. ; KLPAC, Shanghai)
The study of QCD scattering amplitudes in the collinear regime provides crucial insight into the factorization properties of hadronic cross sections. [...]
CERN-TH-2026-066 ; arXiv:2603.27123. - 6.
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