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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/
https://kds.kek.jp/indico/event/33396/timetable/#20200111.detailed
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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.
Considering this situation, we organize one-day workshop to discuss
* Theories and experiments of nucleon EDMs
* Tensor charge by lattice QCD
* Theories and experiments of transversity distributions
* Chiral-odd fragmentation functions
* Nuclear EDMs
A preliminary list of speakers are the following.
All the talk titles are tentative.
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v.2019-12-24
[EDM theories]
M. Endo (KEK)
Theory overview on nucleon EDMs
D. Nomura (KEK)
Some comments on the standard model prediction for baryon EDM
[EDM experiments]
S. Kawasaki (KEK)
Neutron EDM experiment at TRIUMF
Y. Semertzidis (KAISTj
Proton EDM experiment
H. Shimizu (Nagoya University)
Neutron EDM experiment at J-PARC
[Tensor charge, Lattice QCD]
Takeshi Yamazaki (Tsukuba University)
Tensor charge in lattice QCD (TBC)
[Transversity theories]
S. Kumano (KEK/J-PARC)
Quark and gluon transversity distributions
[Transversity experiments]
Y. Miyachi/G. Nukazuka (Yamagata University)
Experiments on transversity distributions
[Chiral-odd fragmentation functions]
R. Seidl (RIKEN)
Chiral-odd fragmentation functions
[Nuclear EDMs]
K. Asahi (RIKEN)
Experiment on nuclear EDMs
K. Yanase (Tokyo University)
Theory on nuclear EDMs
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If you would like to participate in the workshop, please send the attached
registration form by December 26, 2019.
We are looking forward to seeing you and having active discussions
on nucleon electric dipole moments and spin structure at the workshop.
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)
Inquiry on the workshop: Please send an email (edmspin20) to the organizers.
Inquiry on KEK visit: Please send an email (edmspin20) to Ms. Iioka.
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***** Registration form *****
Deadline: December 26, 2019
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To: edmspin20(AT)ml.post.kek.jp
Subject: Nucleon EDMs and spin structure 2020-01, Registration
1. Name (first name, last name):
2. Affiliation:
3. Title/Position:
4. Phone number:
5. Email:
6. Do you need a lunch box?
* We recommend you to take a lunch box because there is
no nearby restaurant on Saturday. A lunch box costs about 700 yen.
* Do you have a dietary restriction? If yes, please explain.
7. Do you want to stay at the KEK dormitory? Yes/No
If yes, please answer following questions:
* Check-in date : Jan. ??
* Check-out date : Jan. ??
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