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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 - 10 p. - Published in : Nucl. Phys. B 1018 (2025) 117012 Fulltext: 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 - 6 p. - Published in : Phys. Lett. B 868 (2025) 139696 Fulltext: 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 - 38 p. - Published in : JCAP 2505 (2025) 102 Fulltext: PDF;

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2025-03-18
04:01
Forecasting constraints on scalar-induced gravitational waves with future pulsar timing array observations / Cecchini, Chiara (Trento U. ; CERN ; INFN, Trento) ; Franciolini, Gabriele (CERN) ; Pieroni, Mauro (CERN)
Pulsar Timing Arrays are playing a crucial role in the ongoing gravitational wave astronomy revolution. The current evidence for a stochastic gravitational wave background (SGWB) at nHz frequencies offers an opportunity to discover cosmological signals and threatens the observability of other subdominant GWs. [...]
arXiv:2503.10805; CERN-TH-2025-045.- 2025 - 19 p. - Published in : Phys. Rev. D 111 (2025) 123536 Fulltext: 2503.10805 - PDF; nxx5-gx7d - PDF;

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2025-03-07
04:17
Large charge meets semiclassics in $\mathcal{N}=4$ super Yang-Mills / Brown, Augustus (Queen Mary, U. of London) ; Galvagno, Francesco (Queen Mary, U. of London) ; Grassi, Alba (U. Geneva (main)) ; Iossa, Cristoforo (U. Geneva (main)) ; Wen, Congkao (Queen Mary, U. of London)
We study the large-charge sector of $\mathcal{N}=4$ super Yang-Mills theory (SYM) with $SU(N)$ gauge group by constructing a special class of half-BPS heavy operators, termed "canonical operators". Such operators exhibit remarkable simplicity in the large-charge 't Hooft limit, where the dimension of the operators $\Delta \to \infty$ with $\Delta\, g_{\text{YM}}^2$ held finite. [...]
arXiv:2503.02028; CERN-TH-2025-016; QMUL-PH-25-03.- 2025-06-24 - 49 p. - Published in : JHEP 2506 (2025) 223 Fulltext: 2503.02028 - PDF; document - PDF;

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2025-02-25
04:01
Lepton Flavor Asymmetries: from the early Universe to BBN / Domcke, Valerie (CERN) ; Escudero, Miguel (CERN) ; Fernandez Navarro, Mario (Glasgow U.) ; Sandner, Stefan (Los Alamos)
Large primordial lepton flavor asymmetries with almost vanishing total baryon-minus-lepton number can evade the usual BBN and CMB constraints if neutrino oscillations lead to perfect flavor equilibration. Solving the momentum averaged quantum kinetic equations (QKEs) describing neutrino oscillations and interactions, we perform the first systematic investigation of this scenario, uncovering a rich flavor structure in stark contradiction to the assumption of simple flavor equilibration. [...]
arXiv:2502.14960; CERN-TH-2025-010; LA-UR-25-20235.- 2025-06-13 - 42 p. - Published in : JHEP 2506 (2025) 137 Fulltext: 2502.14960 - PDF; document - PDF;

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