% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Erben:639475,
      author       = {Erben, Felix and Gülpers, Vera and Hansen, Maxwell T. and
                      Hodgson, Raoul Rustell and Portelli, Antonin},
      title        = {{E}xploratory calculation of the rare hyperon decay
                      Σ$^{+}$ → pℓ$^{+}$ℓ$^{−}$ from lattice {QCD}},
      reportid     = {PUBDB-2025-04561, arXiv:2504.07727. CERN-TH-2025-055.
                      DESY-25-057},
      year         = {2025},
      note         = {35 pages, 16 figures and 6 tables. Prepared for submission
                      to JHEP},
      abstract     = {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.},
      keywords     = {Hadronic Matrix Elements and Weak Decays (autogen) /
                      Lattice QCD (autogen)},
      cin          = {$Z_ZPPT$},
      ddc          = {530},
      cid          = {$I:(DE-H253)Z_ZPPT-20210408$},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / RAD
                      TORCH - Rare decays of heavy mesons to resonant channels
                      (101106913) / NewPhysLat - Search for new physics through
                      lattice simulations (757646) / EuroPLEx - European network
                      for Particle physics, Lattice field theory and Extreme
                      computing (813942)},
      pid          = {G:(DE-HGF)POF4-611 / G:(EU-Grant)101106913 /
                      G:(EU-Grant)757646 / G:(EU-Grant)813942},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2504.07727},
      howpublished = {arXiv:2504.07727},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2504.07727;\%\%$},
      url          = {https://bib-pubdb1.desy.de/record/639475},
}