# Stefan Leupold

Professor at Department of Physics and Astronomy; Nuclear Physics

- Telephone:
- +46 18 471 34 41
- E-mail:
- stefan.leupold@physics.uu.se
- Visiting address:
- Ångströmlaboratoriet, Lägerhyddsvägen 1
- Postal address:
- Box 516

751 20 UPPSALA

More information is available to staff who log in.

## Short presentation

The research of my theory group is focused on the strong interaction, one of the four known fundamental forces. We contribute to high-precision standard-model calculations with the aim to search for differences between nature and our theoretical description of it. In addition, we want to gain a better quantitative understanding how quarks form composite objects, the hadrons.

For more details see also the presentation of my research group.

You can find me at Ångström office 12136.

## Publications

### Recent publications

- Electroweak structure of the nucleon (2024)
- Goldberger-Treiman relation and Wu-type experiment in the decuplet sector (2024)
- Light quark mass dependence of nucleon electromagnetic form factors in dispersively modified chiral perturbation theory (2023)
- Sum rule for the partial decay rates of bottom hadrons based on the dynamical supersymmetry of the (s)over-bar quark and the ud diquark (2022)
- Estimates for rare three-body decays of the Omega baryon using chiral symmetry and the Delta I=1/2 rule (2022)

### All publications

#### Articles

- Electroweak structure of the nucleon (2024)
- Goldberger-Treiman relation and Wu-type experiment in the decuplet sector (2024)
- Light quark mass dependence of nucleon electromagnetic form factors in dispersively modified chiral perturbation theory (2023)
- Sum rule for the partial decay rates of bottom hadrons based on the dynamical supersymmetry of the (s)over-bar quark and the ud diquark (2022)
- Estimates for rare three-body decays of the Omega baryon using chiral symmetry and the Delta I=1/2 rule (2022)
- Study of CP violation in hyperon decays at super-charm-tau factories with a polarized electron beam (2022)
- Electromagnetic transition form factors and Dalitz decays of hyperons (2021)
- The anomalous magnetic moment of the muon in the Standard Model (2020)
- Dynamics of critical fluctuations (2020)
- Radiative corrections for the decay Sigma(0) -> Lambda e(+)e(-) (2020)
- Electromagnetic form factors of the transition from the spin-3/2 Σ to the Λ hyperon (2020)
- Nucleon parton distributions from hadronic quantum fluctuations (2019)
- Low-energy axial-vector transitions from decuplet to octet baryons (2019)
- Constraining P and CP violation in the main decay of the neutral Sigma hyperon (2019)
- Polarization observables in e(+) e(-) annihilation to a baryon-antibaryon pair (2019)
- Chiral-partner D mesons in a heat bath within QCD sum rules (2018)
- Pion-Pole Contribution to Hadronic Light-By-Light Scattering in the Anomalous Magnetic Moment of the Muon (2018)
- Dispersion relation for hadronic light-by-light scattering (2018)
- The relativistic chiral Lagrangian for decuplet and octet baryons at next-to-leading order (2018)
- Radiative corrections to the η
^{(')}Dalitz decays (2018) - The nucleon as a test case to calculate vector-isovector form factors at low energies (2018)
- Towards a dispersive determination of the pion transition form factor (2018)
- Measurement of the ω → π
^{+}π^{−}π^{0}Dalitz plot distribution (2017) - The electromagnetic Sigma-to-Lambda hyperon transition form factors at low energies (2017)
- Lifetime of the eta’ meson at low temperature (2016)
- Renormalisation of the low-energy constants of chiral perturbation theory from loops with dynamical vector mesons (2016)
- Two-hadron saturation for the pseudoscalar-vector-vector correlator and phenomenological applications (2015)
- Dispersive analysis of the pion transition form factor (2014)
- Photon-fusion reactions from the chiral Lagrangian with dynamical light vector mesons (2013)
- Off-equilibrium photon production during the chiral phase transition (2013)
- The impact of dissipation and noise on fluctuations in chiral fluid dynamics (2013)
- Dynamics of the low-lying pseudoscalar and vector mesons (2013)
- Reactions with pions and vector mesons in the sector of odd intrinsic parity (2013)
- Exclusive measurement of the eta -> pi(+) pi(-) gamma decay (2012)
- The WASA focussing light guide disc DIRC (2012)
- Four-quark condensates in open-charm chiral QCD sum rules (2012)
- The impact of chirally odd condensates on the rho meson (2012)
- Vector-meson dominance revisited (2012)
- Towards an effective field theory for vector mesons (2012)
- Nonequilibrium effects in dynamic symmetry breaking (2012)
- Equilibration and relaxation times at the chiral phase transition including reheating (2012)
- Electromagnetic transitions in an effective chiral Lagrangian with the eta ' and light vector mesons (2012)
- Radiative decays of vector and pseudoscalar nonets (2012)
- Electromagnetic transition form factors of mesons (2012)
- WHAT IS THE NATURE OF THE ABC EFFECT? (2011)
- SEARCH FOR EXOTIC EFFECTS IN eta MESON LEPTONIC DECAYS (2011)
- Measurement of the transition form factor of η meson with WASA-at-COSY (2011)
- Description of Fully Differential Drell-Yan Pair Production (2011)
- Design of a disc DIRC detector for the WASA experiment (2011)
- CHARGE SYMMETRY BREAKING IN dd -> (4)He pi(0) WITH WASA-at-COSY (2011)
- Chiral QCD sum rules for open-charm mesons (2011)
- STUDY OF THE eta -> gamma e(+)e(-) DECAY WITH THE WASA-at-COSY (2011)
- STUDIES OF MESON PRODUCTION AND DECAYS IN pd -> (3)He X WITH WASA-at-COSY (2011)
- LEADING MODES OF 3 pi(0) PRODUCTION IN PROTON-PROTON COLLISIONS AT INCIDENT PROTON MOMENTUM 3.35 GeV/c (2011)
- Measurement of the branching ratio of a rare decay
*η*→*π*^{0}*γ**γ*with WASA‐at‐COSY (2011) - Nonequilibrium chiral fluid dynamics including dissipation and noise (2011)
- INVESTIGATION OF THE CHARGE SYMMETRY CONSERVING REACTION dd -> (3)He n pi(0) WITH WASA-at-COSY (2011)
- Meson Production and Decays with WASA at COSY (2011)
- Experimental study of ppη dynamics with WASA-at-COSY (2011)
- MEASUREMENT OF dd -> (3)He p pi(-) WITH WASA-at-COSY (2011)
- Study of charge symmetry breaking in dd collisions with WASA-at-COSY (2011)
- Search for the
*η*→ e^{+}e^{−}e^{+}e^{−} double Dalitz decay (2011) - Hadrons in Medium (2010)
- Electromagnetic transition form factors of light vector mesons (2010)

#### Books

#### Conferences

- Interactions of light mesons with photons (2014)
- Low-lying pseudoscalar and vector mesons and their dynamics (2014)
- Reactions with pions and vector mesons in the sector of odd intrinsic parity (2014)
- Non-equilibrium photon production arising from the chiral mass shift (2013)
- Leading Modes of 3pi0 production in proton-proton collisions at incident proton momentum of 3.35 GeV/c (2011)
- Studies of meson production and decays in pd -> 3HeX with WASA-at-COSY (2011)