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SUMMARY:Towards a Microscopic and Precision Description of Nuclear Schiff 
 Moments
DTSTART:20260521T040000Z
DTEND:20260521T060000Z
DTSTAMP:20260506T221600Z
UID:indico-event-5651@indico2.riken.jp
DESCRIPTION:Speakers: Jiangming Yao (Sun Yat-sen University)\n\nCharge-par
 ity (CP) violation is a key ingredient in explaining the matter-antimatter
  asymmetry of the Universe. However\, the amount of CP violation predicted
  by the Standard Model is far too small to account for the observed baryon
  asymmetry\, pointing to the existence of new CP-violating mechanisms beyo
 nd the Standard Model. A permanent electric dipole moment (EDM) of an elem
 entary or composite system—such as a neutron\, nucleus\, atom\, or molec
 ule—would provide a sensitive and direct signal of such new physics. Con
 sequently\, the search for EDMs has become a major frontier in particle\, 
 nuclear\, and atomic physics.\nAmong these efforts\, measurements of atomi
 c EDMs in diamagnetic atoms are of particular interest\, since they are pr
 imarily induced by nuclear Schiff moments. The latter depend sensitively o
 n nuclear structure and arise from parity- and time-reversal-violating (P\
 , T-violating) nucleon-nucleon interactions. Atomic EDM experiments theref
 ore provide a powerful probe of the low-energy constants that characterize
  P\, T-violating nuclear forces. To connect such measurements to underlyin
 g sources of CP violation\, reliable calculations of nuclear Schiff moment
 s are indispensable. At present\, however\, theoretical predictions still 
 suffer from an uncertainty of more than an order of magnitude.\nIn this ta
 lk\, I will present a beyond-mean-field study of nuclear Schiff moments in
  experimentally relevant diamagnetic atoms based on state-of-the-art multi
 reference covariant density functional theory. The results highlight the i
 mportant roles of shape-mixing effects in determining nuclear Schiff momen
 ts. Finally\, I will discuss preliminary results from ongoing ab initio st
 udies of nuclear Schiff moments based on nuclear forces derived from chira
 l effective field theory.\n\nhttps://indico2.riken.jp/event/5651/
LOCATION:RIBF Hall\, RIBF 2nd Floor (Wako)
URL:https://indico2.riken.jp/event/5651/
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