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
   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

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


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 & KAISTj
   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


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


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)