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| Home > Publications database > Exploratory calculation of the rare hyperon decay Σ$^{+}$ → pℓ$^{+}$ℓ$^{−}$ from lattice QCD > print |
| 001 | 639475 | ||
| 005 | 20251102055618.0 | ||
| 024 | 7 | _ | |a Erben:2025jkq |2 INSPIRETeX |
| 024 | 7 | _ | |a inspire:2910459 |2 inspire |
| 024 | 7 | _ | |a arXiv:2504.07727 |2 arXiv |
| 024 | 7 | _ | |a altmetric:176047016 |2 altmetric |
| 037 | _ | _ | |a PUBDB-2025-04561 |
| 041 | _ | _ | |a English |
| 082 | _ | _ | |a 530 |
| 088 | _ | _ | |a arXiv:2504.07727 |2 arXiv |
| 088 | _ | _ | |a CERN-TH-2025-055 |2 CERN |
| 088 | _ | _ | |a DESY-25-057 |2 DESY |
| 100 | 1 | _ | |a Erben, Felix |b 0 |
| 245 | _ | _ | |a Exploratory calculation of the rare hyperon decay Σ$^{+}$ → pℓ$^{+}$ℓ$^{−}$ from lattice QCD |
| 260 | _ | _ | |c 2025 |
| 336 | 7 | _ | |a Preprint |b preprint |m preprint |0 PUB:(DE-HGF)25 |s 1761655949_1064280 |2 PUB:(DE-HGF) |
| 336 | 7 | _ | |a WORKING_PAPER |2 ORCID |
| 336 | 7 | _ | |a Electronic Article |0 28 |2 EndNote |
| 336 | 7 | _ | |a preprint |2 DRIVER |
| 336 | 7 | _ | |a ARTICLE |2 BibTeX |
| 336 | 7 | _ | |a Output Types/Working Paper |2 DataCite |
| 500 | _ | _ | |a 35 pages, 16 figures and 6 tables. Prepared for submission to JHEP |
| 520 | _ | _ | |a 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. Consequently, this decay is highly suppressed, making it a promising avenue for probing potential new physics. While phenomenological calculations have made important progress in predicting the decay amplitude, there remains a four-fold ambiguity in the relevant transition form factors that prevents a unique prediction for the branching fraction and angular observables. Fully resolving this ambiguity requires a first-principles Standard-Model calculation, and the recent observation of this process using LHCb Run 2 data reinforces the timeliness of such a calculation. In this work, we present the first lattice-QCD calculation of this decay, performed using a 2+1-flavour domain-wall fermion ensemble with a pion mass of 340 Mev. At a small baryon source-sink separation, we observe the emergence of a signal in the relevant baryonic four-point functions. This allows us to determine the positive-parity form factors for the rare hyperon decays from first-principles, albeit with large statistical and systematic uncertainties. |
| 536 | _ | _ | |a 611 - Fundamental Particles and Forces (POF4-611) |0 G:(DE-HGF)POF4-611 |c POF4-611 |f POF IV |x 0 |
| 536 | _ | _ | |a RAD TORCH - Rare decays of heavy mesons to resonant channels (101106913) |0 G:(EU-Grant)101106913 |c 101106913 |f HORIZON-MSCA-2022-PF-01 |x 1 |
| 536 | _ | _ | |a NewPhysLat - Search for new physics through lattice simulations (757646) |0 G:(EU-Grant)757646 |c 757646 |f ERC-2017-STG |x 2 |
| 536 | _ | _ | |a EuroPLEx - European network for Particle physics, Lattice field theory and Extreme computing (813942) |0 G:(EU-Grant)813942 |c 813942 |f H2020-MSCA-ITN-2018 |x 3 |
| 588 | _ | _ | |a Dataset connected to CrossRef, INSPIRE, Journals: bib-pubdb1.desy.de |
| 650 | _ | 7 | |a Hadronic Matrix Elements and Weak Decays |2 autogen |
| 650 | _ | 7 | |a Lattice QCD |2 autogen |
| 693 | _ | _ | |0 EXP:(DE-MLZ)NOSPEC-20140101 |5 EXP:(DE-MLZ)NOSPEC-20140101 |e No specific instrument |x 0 |
| 700 | 1 | _ | |a Gülpers, Vera |0 0000-0003-4555-6662 |b 1 |
| 700 | 1 | _ | |a Hansen, Maxwell T. |0 0000-0001-9184-8354 |b 2 |
| 700 | 1 | _ | |a Hodgson, Raoul Rustell |0 P:(DE-H253)PIP1107886 |b 3 |e Corresponding author |
| 700 | 1 | _ | |a Portelli, Antonin |0 0000-0002-6059-917X |b 4 |
| 856 | 4 | _ | |u https://bib-pubdb1.desy.de/record/639475/files/2504.07727v1.pdf |y Restricted |
| 856 | 4 | _ | |u https://bib-pubdb1.desy.de/record/639475/files/2504.07727v1.pdf?subformat=pdfa |x pdfa |y Restricted |
| 909 | C | O | |o oai:bib-pubdb1.desy.de:639475 |p openaire |p VDB |p ec_fundedresources |
| 910 | 1 | _ | |a Deutsches Elektronen-Synchrotron |0 I:(DE-588b)2008985-5 |k DESY |b 3 |6 P:(DE-H253)PIP1107886 |
| 913 | 1 | _ | |a DE-HGF |b Forschungsbereich Materie |l Matter and the Universe |1 G:(DE-HGF)POF4-610 |0 G:(DE-HGF)POF4-611 |3 G:(DE-HGF)POF4 |2 G:(DE-HGF)POF4-600 |4 G:(DE-HGF)POF |v Fundamental Particles and Forces |x 0 |
| 914 | 1 | _ | |y 2025 |
| 915 | _ | _ | |a Published |0 StatID:(DE-HGF)0580 |2 StatID |
| 920 | 1 | _ | |0 I:(DE-H253)Z_ZPPT-20210408 |k Z_ZPPT |l Zeuthen Particle PhysicsTheory |x 0 |
| 980 | _ | _ | |a preprint |
| 980 | _ | _ | |a VDB |
| 980 | _ | _ | |a I:(DE-H253)Z_ZPPT-20210408 |
| 980 | _ | _ | |a UNRESTRICTED |
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