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Research Van Swinderen Institute

VSI PhD Ceremony Ubbi Sauerwein, 12 March 2021

30 March 2021

Axial-vector currents and chiral symmetry

Phase Transitions are the origin of many interesting phenomena in physics. At 0 ºC ice changes its aggregate state - it melts - leading to modified physical properties. During the past decades phase transitions in the field of particle physics caught interest. Some can be located in the phase diagram of quantum chromodynamics. A phase transition is not only possible in terms of temperature, like in the example given in the beginning, but also in other quantities like a magnetic field or the Higgs field. In our work we find first hints for a possible phase transition in the axial-vector form factor of the nucleon, which is connected to the ß-decay of the neutron. Protons and neutrons, the constituents of atomic nuclei, are compound particles consisting of tiny elementary particles called quarks. We show that our observations are directly linked to the use of a novel approach, namely on-shell masses in loop contributions of axial-vector form factors. Since our findings cannot be directly observed in nature, we propose explicit scenarios how to check our claims with numerical simulations from lattice quantum chromodynamics.

Dissertation: http://hdl.handle.net/(...)83-bc8f-c80a769fa357

Last modified:31 March 2021 10.48 a.m.

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