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2025-07-09
08:26
Superadditivity at Large Charge / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Fadakar, Ipak (EPFL, Lausanne, LPTP ; Pisa, Scuola Normale Superiore) ; Gomes, Andrew (EPFL, Lausanne, LPTP) ; Monin, Alexander (South Carolina U.) ; Rattazzi, Riccardo (EPFL, Lausanne, LPTP)
The weak gravity conjecture has been invoked to conjecture that the dimensions of charged operators in a CFT should obey a superadditivity relation (sometimes referred to as convexity). In this paper, we study superadditivity of the operator spectrum in theories expanded about the semi-classical saddle point that dominates correlators of large charge operators. [...]
arXiv:2503.16603; CERN-TH-2025-036.- 2025 - 27 p. - Published in : JHEP 2507 (2025) 113 Fulltext: 2503.16603 - PDF; document - PDF;

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2025-05-21
04:14
ADM, BMS, and some puzzling interconnections / Veneziano, Gabriele (CERN ; College de France)
The precise connection between the ADM and BMS formalisms is still far from being fully understood. It leads superficially to some puzzles whose resolution can provide new interesting physical insights. [...]
arXiv:2505.11937; CERN-TH-2025-042.- 2025-05-15 - 14 p. - Published in : J. Phys. A: Math. Theor. 58 (2025) 205402 Fulltext: 2505.11937 - PDF; document - PDF;

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2025-05-20
04:06
The LHC has ruled out supersymmetry – really? / Constantin, L. (LPSC, Grenoble) ; Kraml, S. (LPSC, Grenoble) ; Mahmoudi, F. (IP2I, Lyon ; CERN ; IUF, Paris)
Despite early hopes that the Large Hadron Collider (LHC) would quickly unveil supersymmetric particles, none have been detected to date. This review examines the impact of the LHC results on the viability of weak-scale supersymmetry, and discusses whether the possibility of discovering supersymmetric particles remains within reach..
arXiv:2505.11251; CERN-TH-2025-100.- 2025-07-03 - 10 p. - Published in : Nucl. Phys. B 1018 (2025) 117012 Fulltext: 2505.11251 - PDF; document - PDF;

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2025-05-07
04:03
The Simplest Dark Matter Model at the Edge of Perturbativity / Escudero Abenza, Miguel (CERN) ; Hambye, Thomas (Brussels U.)
Increasingly sensitive direct detection dark matter experiments are testing important regions of parameter space for WIMP dark matter and pushing many models to the multi-TeV regime. This brings into question the perturbativity of these models. [...]
arXiv:2505.02408; CERN-TH-2025-087; ULB-TH/25-04.- 2025-06-27 - 6 p. - Published in : Phys. Lett. B 868 (2025) 139696 Fulltext: 2505.02408 - PDF; document - PDF;

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2025-04-25
04:05
Long distance contributions to neutral $D$-meson mixing from lattice QCD / Di Carlo, Matteo (CERN) ; Erben, Felix (CERN) ; Hansen, Maxwell T. (Edinburgh U.)
The study of neutral $D$-meson mixing provides a unique probe of long-distance effects in the charm sector, where Standard Model contributions are dominated by nonperturbative effects. In this work, we investigate the feasibility of using spectral reconstruction techniques within lattice QCD to compute the long-distance contributions to $D^0- \bar{D}^0$ mixing. [...]
arXiv:2504.16189; CERN-TH-2025-075.- 2025-04-22 - 47 p. - Published in : JHEP 2025 (2020) 229 Fulltext: 2504.16189 - PDF; document - PDF;

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2025-04-16
04:04
Comparison of smoothening flows for the topological charge in QCD-like theories / Butti, Pietro (U. Southern Denmark, QTC) ; Della Morte, Michele (U. Southern Denmark, QTC) ; Jäger, Benjamin (U. Southern Denmark, QTC ; U. Southern Denmark, Odense, DIAS) ; Martins, Sofie (U. Southern Denmark, QTC) ; Tsang, J. Tobias (CERN)
We investigate properties of the topological charge for several SU(NC) gauge field ensembles for NC = 4, 5, 6 with a single fermion in the two-index anti-symmetric representation, covering multiple lattice spacings at otherwise approximately constant physical parameters. Comparing the topological charge defined by the Wilson flow and the over-improved DBW2 flow we find that already at small flow times the latter stabilises on discrete values. [...]
arXiv:2504.10197; CERN-TH-2025-079.- 2025-07-01 - 11 p. - Published in : Phys. Rev. D 112 (2025) 014504 Fulltext: 2504.10197 - PDF; document - PDF;

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2025-04-12
04:52
Exploratory calculation of the rare hyperon decay $\Sigma^+ \to p \ell^+ \ell^-$ from lattice QCD / Erben, Felix (CERN) ; Gülpers, Vera (Edinburgh U.) ; Hansen, Maxwell T. (Edinburgh U.) ; Hodgson, Raoul (Edinburgh U. ; DESY, Zeuthen) ; Portelli, Antonin (Edinburgh U.)
The rare hyperon decay $\Sigma^+ \to p \ell^+ \ell^-$ is a flavour-changing neutral current process mediated by an $s \to d$ transition that occurs only at loop level within the Standard Model. Consequently, this decay is highly suppressed, making it a promising avenue for probing potential new physics. [...]
arXiv:2504.07727; CERN-TH-2025-055; DESY-25-057.- 2025 - 33 p. - Published in : JHEP 2507 (2025) 038 Fulltext: 2504.07727 - PDF; document - PDF;

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2025-04-08
04:07
Inclusive semileptonic decays from lattice QCD: analysis of systematic effects / Kellermann, Ryan (KEK, Tsukuba) ; Hu, Zhi (KEK, Tsukuba) ; Barone, Alessandro (U. Mainz, PRISMA) ; Elgaziari, Ahmed (U. Southampton (main)) ; Hashimoto, Shoji (KEK, Tsukuba ; Sokendai, Tsukuba) ; Kaneko, Takashi (KEK, Tsukuba ; Sokendai, Tsukuba) ; Jüttner, Andreas (U. Southampton (main) ; CERN)
Lattice QCD calculations of inclusive semileptonic decay rates involve new types of systematic effects, such as truncation errors in the estimation of energy integrals, or finite-volume effects for multi-body final states. We investigate them for the lattice data of $D_s \to X_s \ell\nu$ decays, obtained using Möbius domain-wall fermions. [...]
arXiv:2504.03358; KEK-CP-0407; CERN-TH-2025-059.- 2025-07-01 - 56 p. - Published in : Phys. Rev. D 112 (2025) 014501 Fulltext: 2504.03358 - PDF; document - PDF; Publication: PDF;

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2025-04-01
04:28
Axial perturbations of black holes with primary scalar hair / Charmousis, Christos (IJCLab, Orsay ; CERN) ; Iteanu, Simon (IJCLab, Orsay) ; Langlois, David (APC, Paris) ; Noui, Karim (IJCLab, Orsay)
We study axial perturbations of static black holes with primary hair in a family of degenerate higher-order scalar-tensor (DHOST) theories. These solutions possess a scalar charge, fully independent of the mass, leading to a continuous one-parameter deformation of the standard Schwarzschild black hole. [...]
arXiv:2503.22348; CERN-TH-2025-058.- 2025-05-30 - 32 p. - Published in : JCAP 2505 (2025) 102 Fulltext: PDF;

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2025-03-20
04:07
Finite-temperature bubble nucleation with shifting scale hierarchies / Kierkla, Maciej (Warsaw U.) ; Schicho, Philipp (Geneva U.) ; Swiezewska, Bogumila (Warsaw U.) ; Tenkanen, Tuomas V.I. (Helsinki Inst. of Phys.) ; van de Vis, Jorinde (CERN)
Focusing on supercooled phase transitions in models with classical scale symmetry, we formulate a state-of-the art framework for computing the bubble-nucleation rate, accounting for the presence of various energy scales. In particular, we examine the limitations of derivative expansions in constructing a thermal effective field theory for bubble nucleation. [...]
arXiv:2503.13597; CERN-TH-2025-046; HIP-2024-27/TH.- 2025 - 51 p. - Published in : JHEP 2507 (2025) 153 Fulltext: 2503.13597 - PDF; document - PDF;

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