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2025-04-12
04:52
Exploratory calculation of the rare hyperon decay Σ+→pℓ+ℓ− 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 Σ+→pℓ+ℓ− is a flavour-changing neutral current process mediated by an s→d transition that occurs only at loop level within the Standard Model. [...]
CERN-TH-2025-055 ; DESY-25-057 ; arXiv:2504.07727. - 35.
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2025-04-11
04:28
New physics particles mixing with mesons: production in the fragmentation chain / Kyselov, Yehor (Taras Shevchenko U.) ; Mrenna, Stephen (Cincinnati U. ; Fermilab) ; Ovchynnikov, Maksym (CERN)
A class of extensions to the Standard Model adds hypothetical long-lived particles (LLPs) that have mass- or kinetic-mixing with neutral mesons, such as pions or rho mesons. [...]
CERN-TH-2025-073 ; FERMILAB-PUB-25-0200-CSAID ; arXiv:2504.06828. -
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2025-04-11
04:26
Les Houches 2023 - Physics at TeV Colliders: Report on the Standard Model Precision Wishlist / Huss, Alexander (CERN) ; Huston, Joey (Michigan State U.) ; Jones, Stephen (Durham U., IPPP) ; Pellen, Mathieu (Freiburg U.) ; Röntsch, Raoul (INFN, Milan ; Milan U.)
Les Houches returned to an in-person format in 2023 and the bi-yearly tradition of updating the standard model precision wishlist has continued. [...]
CERN-TH-2025-071 ; FR-PHENO-2025-005 ; IPPP/25/19 ; TIF-UNIMI-2025-9 ; arXiv:2504.06689. - 99.
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2025-04-10
04:56
Logarithmically-accurate and positive-definite NLO shower matching / van Beekveld, Melissa (NIKHEF, Amsterdam) ; Ferrario Ravasio, Silvia (CERN) ; Helliwell, Jack (Monash U.) ; Karlberg, Alexander (CERN) ; Salam, Gavin P. (Oxford U., Theor. Phys. ; U. Oxford (main)) ; Scyboz, Ludovic (Monash U.) ; Soto-Ontoso, Alba (Granada U.) ; Soyez, Gregory (IPhT, Saclay) ; Zanoli, Silvia (Oxford U., Theor. Phys.)
We present methods to achieve NLL+NLO accurate parton showering for processes with two coloured legs: neutral- and charged-current Drell-Yan, and Higgs production in pp collisions, as well as DIS and e+e− to jets. [...]
CERN-TH-2025-004 ; OUTP-25-01P ; Nikhef 2025-003 ; arXiv:2504.05377. - 50.
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2025-04-08
04:07
Inclusive semileptonic decays from lattice QCD: analysis of systematic effects / Kellermann, Ryan (KEK, Tsukuba) ; Barone, Alessandro (U. Mainz, PRISMA) ; Elgaziari, Ahmed (U. Southampton (main)) ; Hashimoto, Shoji (KEK, Tsukuba ; Sokendai, Tsukuba) ; Hu, Zhi (KEK, Tsukuba) ; Jüttner, Andreas (U. Southampton (main) ; CERN) ; Kaneko, Takashi (KEK, Tsukuba ; Sokendai, Tsukuba)
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. [...]
KEK-CP-0407 ; CERN-TH-2025-059 ; arXiv:2504.03358. - 56.
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2025-04-05
04:44
Gravitational Wave with Domain Wall Dominance / Hong, Sungwoo (KAIST, Taejon) ; Lee, Sung Mook (KAIST, Taejon ; CERN) ; Liang, Qiuyue (Tokyo U., IPMU)
Domain walls (DWs) can be produced when a discrete symmetry is spontaneously broken, and long-lived DWs can dominate the energy density of the universe. [...]
CERN-TH-2025-070 ; arXiv:2504.02462. - 15.
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2025-04-02
04:06
Physics case for low-√s QCD studies at FCC-ee / Verbytskyi, Andrii (Garching, Max Planck Inst.) ; d'Enterria, David (CERN) ; Monni, Pier Francesco (CERN) ; Skands, Peter (Monash U.)
Measurements of hadronic final states in e+e− collisions at centre-of-mass (CM) energies below the Z peak can notably extend the FCC-ee physics reach in terms of precision quantum chromodynamics (QCD) studies. [...]
CERN-TH-2025-064 ; arXiv:2503.23855. - 13 p, 13.
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2025-04-02
04:04
NNLOJET: a parton-level event generator for jet cross sections at NNLO QCD accuracy / NNLOJET Collaboration
The antenna subtraction method for NNLO QCD calculations is implemented in the NNLOJET parton-level event generator code to compute jet cross sections and related observables in electron-positron, lepton-hadron and hadron-hadron collisions. [...]
arXiv:2503.22804 ; CERN-TH-2025-012 ; IPPP/25/09 ; ZU-TH 11/25. - 42.
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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. [...]
CERN-TH-2025-058 ; arXiv:2503.22348. - 32.
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2025-04-01
04:24
Precision Tests in b→sℓ+ℓ− (ℓ=e,μ) at FCC-ee / Bordone, Marzia (Zurich U. ; CERN) ; Cornella, Claudia (CERN) ; Davighi, Joe (CERN)
The rare semi-leptonic decays B→K∗ℓ+ℓ−, with ℓ=e,μ, are highly sensitive to new physics (NP) due to their suppression in the Standard Model (SM). [...]
CERN-TH-2025-065 ; ZU-TH 22/25 ; arXiv:2503.22635. - 21.
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