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2026-05-08
04:09
Heterotic String Theory Suggests a QCD Axion Near 0.5 neV / Benabou, Joshua N. (LBL, Berkeley ; UC, Berkeley) ; Dainelli, Giulio Alvise (LBL, Berkeley ; UC, Berkeley) ; Reig, Mario (CERN) ; Safdi, Benjamin R. (LBL, Berkeley ; UC, Berkeley)
We show that in heterotic string theory -- and dual corners of the landscape including Type I string theory -- the QCD axion mass is bounded from below by $m_a \gtrsim 0.5$ neV, a direct consequence of the model-independent axion whose decay constant is fixed by the grand unified theory (GUT) gauge coupling. [...]
CERN-TH-2026-098 ; arXiv:2605.04142. - 32.
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2026-05-08
04:03
Are PTA measurements sensitive to gravitational wave non-Gaussianities? / Cecchini, Chiara (Trento U. ; TIFPA-INFN, Trento ; Madrid, Inst. Estructura Materia) ; El Gammal, Jonas (Insubria U., Como) ; Franciolini, Gabriele (Padua U. ; INFN, Padua) ; Pieroni, Mauro (Madrid, Inst. Estructura Materia)
Observing non-Gaussianity in the timing residuals of Pulsar Timing Arrays (PTAs) has recently attracted attention as a potential discriminator between astrophysical and cosmological origins of the observed Gravitational Wave (GW) signal. [...]
CERN-TH-2025-241 ; arXiv:2605.05157. - 11.
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2026-05-06
04:44
Studying the Infrared Behaviour of Improved Logarithmic Accuracy Parton Showers with Herwig / Holguin, Jack (Manchester U.) ; Plätzer, Simon (Graz U. ; Vienna U.) ; Seymour, Michael H. (Manchester U. ; CERN) ; Sule, Siddharth (Manchester U.)
We have implemented two recently proposed dipole shower algorithms that have next-to-leading-logarithmic accuracy at leading colour in the Herwig event generator. [...]
CERN-TH-2026-101 ; MCNET-26-09 ; arXiv:2605.02622. - 46.
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2026-05-02
04:37
Chaos of Berry curvature for BPS microstates / Chen, Yiming (Stanford U.) ; Colin-Ellerin, Sean (UC, Berkeley ; CERN) ; Mamroud, Ohad (SISSA, Trieste ; INFN, Trieste) ; Papadodimas, Kyriakos (CERN)
We expect black hole microstates to differ in their chaotic properties from states associated with other geometries. [...]
CERN-TH-2026-072 ; SISSA 06/2026/FISI ; arXiv:2604.23287. - 138.
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2026-04-28
04:12
Inclusive semileptonic $D_s\to X_s\ell \bar \nu$ decays from lattice QCD: continuum and chiral extrapolation / Kellermann, Ryan (KEK, Tsukuba) ; Barone, Alessandro (U. Mainz, PRISMA ; Mainz U.) ; Elgaziari, Ahmed (Southampton U.) ; Hashimoto, Shoji (Sokendai, Tsukuba ; KEK, Tsukuba) ; Hu, Zhi (RIKEN (main) ; KEK, Tsukuba) ; Jüttner, Andreas (CERN ; Southampton U.) ; Kaneko, Takashi (Sokendai, Tsukuba ; KEK, Tsukuba)
We present results for the inclusive semileptonic $D_s \to X_s \ell\barν$ decay rate from lattice QCD. [...]
KEK-CP-0411 ; CERN-TH-2026-093 ; arXiv:2604.22201. - 33.
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2026-04-28
04:05
Hydrodynamics and Energy Correlators / Barata, João (CERN) ; Kuzmin, Matvey V. (Oxford U., Theor. Phys.) ; Moult, Ian (Yale U. (main)) ; Sadofyev, Andrey V. (Basque U., Bilbao ; LIP, Lisbon ; IKERBASQUE, Bilbao) ; Silva, João M. (LIP, Lisbon ; Lisbon, IST ; Granada U.)
We study energy-energy correlators (EECs) in many-body quantum states, focusing on the matter produced in the aftermath of heavy-ion collisions. [...]
CERN-TH-2026-094 ; arXiv:2604.21971. - 33.
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2026-04-24
04:29
Crosscap Defects / Drukker, Nadav (King's Coll. London (main)) ; Komatsu, Shota (CERN) ; Wallberg, Anders (CERN ; EPFL, Lausanne, LTFP)
We introduce a novel class of defects, termed {\it crosscap defects}, in conformal field theory (CFT) in general dimensions. [...]
CERN-TH-2026-095 ; arXiv:2604.19868. - 50.
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2026-04-23
04:57
Extremely high-energy bremsstrahlung in matter / Arnold, Peter (Virginia U. (main)) ; Bautista, Joshua (Virginia U. (main)) ; Elgedawy, Omar (South China Normal U. ; GPKLDMT, Guangzhou ; Ecole Polytechnique, CPHT) ; Iqbal, Shahin (NCP, Islamabad ; CERN)
The theory of bremsstrahlung $e \to eγ$ by extremely high energy electrons passing through ordinary matter has been qualitatively incomplete. [...]
arXiv:2604.18685 ; CPHT-RR013.042026 ; CERN-TH-2026-091. - 6.
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2026-04-22
04:38
New Physics Reach through Precision at Future Colliders: a Multi-Pronged Approach / Armadillo, Tommaso (Louvain U., CP3 ; Milan U. ; INFN, Milan) ; Celada, Eugenia (Manchester U. ; Cyprus U.) ; ter Hoeve, Jaco (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Maltoni, Fabio (Louvain U., CP3 ; Bologna U. ; CERN) ; Mantani, Luca (Valencia U., IFIC) ; Rojo, Juan (Nikhef, Amsterdam ; Vrije U., Amsterdam) ; Rossia, Alejo N. (U. Padua, Dept. Phys. Astron.) ; Tentori, Simone (Louvain U., CP3) ; Thomas, Marion O.A. (Garching, Max Planck Inst., MPE) ; Vryonidou, Eleni (Cyprus U.)
We present projections for the sensitivity of future high-energy colliders to new physics through precision measurements of the Standard Model (SM) interactions, focusing on near-term electron-positron facilities: FCC-ee, LEP3, and the Linear Collider Facility. [...]
MPP-2026-66 ; CERN-TH-2026-088 ; arXiv:2604.16596. - 71.
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2026-04-18
04:38
The Spurion Massive EFT (SMEFT) / Northey, Julian L. (Technion) ; Shadmi, Yael (Technion) ; Soreq, Yotam (Technion ; CERN) ; Ueda, Daiki (Technion)
We use the amplitude formulation of the SMEFT to introduce a spurion analysis of the SMEFT low-energy amplitudes in terms of the Higgs VEV. [...]
CERN-TH-2026-054 ; arXiv:2604.14274. - 25.
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