TY  - THES
AU  - Veretennikov, Denis
TI  - Longitudinal spin transfer coefficient to Λ and ―Λ hyperons in semi-inclusive deep-inelastic scattering
IS  - DESY-THESIS-2026-002
PB  - University of the Basque Country UPV/EHU
VL  - Dissertation
CY  - Hamburg
M1  - PUBDB-2026-00345
M1  - DESY-THESIS-2026-002
M1  - HERMES-25-001
T2  - DESY-THESIS
SP  - 138
PY  - 2025
N1  - This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 824093 "STRONG-2020", from the QuantERA T-NisQ grant PCI2022-132984 financed by MCIN/AEI/10.13039/501100011033 Spain and the European Union’s ”NextGenerationEU”/PRTR, as well as PID2022-136510NB-C33 financed by MCIN/AEI Spain.
N1  - Dissertation, University of the Basque Country UPV/EHU, 2025
AB  - This dissertation presents a study of the spin-dependent production of the Λ hyperon and the mechanisms of quark fragmentation, with a particular focus on data obtained from the HERMES experiment at DESY. The research explores the role of longitudinal spin effects in semi-inclusive deep-inelastic scattering. For that, the beam-spin induced polarization of Λ and ―Λ hyperons produced in deep-inelastic scattering of longitudinally polarized leptons (positrons or electrons) from unpolarized nucleons is being investigated using data collected by the HERMES experiment at a lepton beam energy of 27.6 GeV. The beam-to-hyperon spin-transfer coefficients D<sub>LX</sub> and D<sub>LZ</sub>, i.e., transverse and along the hyperon momentum direction, are studied as function of the relevant kinematic variables.A novel extraction method, which does not rely on precise detector-response simulations, has been developed and is presented here. Advanced data analysis techniques are employed to mitigate systematic uncertainties arising from experimental acceptance and detector inefficiencies. This approach is applied for the first time by taking advantage of the regular reversal of the HERA lepton beam helicity at the HERMES experiment.
LB  - PUB:(DE-HGF)3 ; PUB:(DE-HGF)11
DO  - DOI:10.3204/PUBDB-2026-00345
UR  - https://bib-pubdb1.desy.de/record/644474
ER  -