Bonn 2020 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Fundamental Symmetries II
HK 19.3: Vortrag
Dienstag, 31. März 2020, 18:00–18:15, J-HS B
Spin Tune Measurements for Electric Dipole Moment Searches — •Abhiroop Sen for the JEDI collaboration — Institut für Kernphysik, Forschungszentrum Jülich — III. Physikalisches Institut B, RWTH Aachen
The electric dipole moment (EDM) of particles is an important property that can be studied to shed light on physics beyond the Standard Model, as well as answer questions about the matter-antimatter asymmetry in the universe (since it is CP violating). The JEDI Collaboration, using the Cooler Synchtrotron (COSY) at Forschungszentrum Jülich, is working towards measuring the EDM of charged particles (protons and deuterons), which would be the first step to further, more detailed, studies about EDMs.
EDMs are measured by studying their influence on the spin motion. One important quantity in this context is the so called spin tune, defined as the number of times the spin precesses about the polarisation axis per particle turn in the ring. Using different approaches, one can analyse the spin tune of particle bunches in COSY and determine the spin coherence time (SCT), which is an estimate of how long the spins of the particles remain in phase, while they precess in the horizontal plane. This talk will concentrate on the analysis of spin tunes for longer cycles of ∼ 103 s.