================================================================================ KEK workshop on Nucleon electric dipole moments and spin structure in 2020 Room 115, 1st Building, KEK Tokai Campus, Tokai, Japan January 11, Saturday, 2020 http://j-parc-th.kek.jp/workshops/2020/01-11/ Indico: https://kds.kek.jp/indico/event/33396/timetable/#20200111.detailed ********************************************************************** After the discovery of CP violation, it is theoretically known that the time-reversal invariance is not exactly satisfied. However, it is not confirmed experimentally. The standard model indicates that the neutron electric dipole moment (EDM) is of the order of 10^(-32) e cm, which is much smaller than the current experimental bound 3x10^(-26)e cm. If there exists a physics mechanism beyond the standard model, it could become 10^(-26)-10^(-28) e cm, which is close to the experimental limit. In the near future, the experimental limit will become 10^(-27)e cm, so that nucleon EDMs are good observables to find a physics signature beyond the standard model. On the other hand, we need to calculate the nucleon EDMs from quark EDMs theoretically in order to compare with the experimental data. So far, effective nucleon models have been used to estimate this conversion. With the progress of lattice QCD methods, it became possible to estimate the conversion coefficient, so called tensor charge, by the lattice QCD. This tensor charge is given by the integral of quark transversity distributions over the Bjorken scaling variable x. The quark transversity distributions had been unknown for a long time; however, it became possible recently to find them experimentally. It is because the KEKB experiment provided chiral-odd hadron fragmentation functions, which can be used for extracting the transversity distributions from hadron production processes of electron-nucleon scattering and proton-proton collisions. circular with Registration form Talk files are available at KEK-Indico. --------------------------------------------------- Registration: 8:30 - 9:00 Theories on EDMs Chair: Toru Sato (Osaka University/KEK) 9:00 - 9:35 (25+10) Motoi Endo (KEK) Theory overview on nucleon EDM 9:35 - 10:05 (25+5) Daisuke Nomura (KEK) Some comments on the standard model prediction for baryon EDM Break EDM experiments Chair: Tsutomu Mibe (KEK/J-PARC) 10:30 - 11:00 (25+5) Shinsuke Kawasaki (KEK) Neutron electric dipole moment search by the TUCAN 11:00 - 11:30 (25+5) Yannis Semertzidis (IBS/CAPP & KAISTj The proton electric dipole moment method with the Hybrid-ring 11:30 - 12:00 (25+5) Hirohiko Shimizu (Nagoya University) Neutron EDM experiment at J-PARC Lunch Nucleon-spin structure theories Chair: Kazuhiro Tanaka (Juntendo University/KEK) 12:50 - 13:20 (25+5) Takeshi Yamazaki (Tsukuba University) Nucleon couplings in Nf=2+1 lattice QCD 13:20 - 13:50 (25+5) Shunzo Kumano (KEK/J-PARC) Quark and gluon transversity distributions Break Nucleon-spin structure experiments Chair: Yoshiyuki Miyachi (Yamagata University) 14:10 - 14:40 (25+5) Ralf Seidl (RIKEN) Chiral-odd fragmentation functions 14:40 - 15:10 (25+5) Genki Nukazuka (Yamagata University) Experiments on transversity distributions Nuclear EDMs Chair: Naohito Saito (J-PARC/KEK) 15:10 - 15:35 (20+5) Kota Yanase (Tokyo University) Atomic EDM and CP violation in atomic nuclei 15:35 - 16:00 (20+5) Koichiro Asahi (RIKEN) EDMs of Nuclear Origin (Experiment) --------------------------------------------------- Organizers: Shunzo Kumano (KEK/J-PARC), Tsutomu Mibe (KEK/J-PARC), Toru Sato (Osaka Univ/KEK), Kazuhiro Tanaka (Juntendo Univ/KEK) Secretary: Kieko Iioka (KEK) Email: edmspin20(AT)ml.post.kek.jp (to S. Kumano, T. Mibe, T. Sato, K. Tanaka, K. Iioka) -----------------------------------------------------------------------------------------