vol. 82 | iTHES

Vol. 82, June 1st, 2015

• Upcoming Events
• Paper of the week

# Enhancement of the CP-odd effect in the nuclear electric dipole moment of 6Li

## From the Office

The office of iTHES assistant, Ms.Chikako Oota is situated at the second floor of the main research building, room # 246. The extension number is 3261. She will be at the office from 10 a.m. to 16 p.m.

## Upcoming Events

June 4 (Thur.) from 2:00 pm
Dr. William Witczak-Krempa (https://www.perimeterinstitute.ca/people/william-witczak-krempa )
Constraining quantum critical dynamics: 2+1D Ising model & beyond
Rm 154&156, Main Research Building, Wako campus, RIKEN
Quantum critical (QC) phase transitions generally lead to the destruction of quasiparticles. The resulting correlated quantum fluid, when thermally excited, displays rich universal dynamics. We establish non-perturbative constraints on the linear-response dynamics of QC systems at finite temperature, in spatial dimensions above one. Specifically, we analyze the large frequency/momentum asymptotics of observables, which we use to derive powerful sum rules. The general results are applied to the O(N) Wilson-Fisher fixed point (CFT), describing the QC Ising and XY models when N=1,2, respectively. We'll contrast the results with Dirac fermions. Our focus will be on the order parameter susceptibility, conductivity, and shear viscosity. Connections to quantum Monte Carlo simulations, experiments and AdS/CFT will be made.
It's based on my recent paper (http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.177201 ), and other works with Subir Sachdev.

Dr. Tomoyuki Higuchi
(The Institute of Statistical Mathematics)
"Interaction, Integration, and Design: Key elements for success on promoting the interdisciplinary research"
(in Japanese)
June 4 (Thur.) 2015, 10：30－11：30
Main research building 435-437

2nd String Theory in Greater Tokyo
http://indico.ipmu.jp/indico/conferenceDisplay.py?ovw=True&confId=68
June 9th, 2015, 9:30-16:20
RIKEN, Nishina Hall
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We invite the following two speakers:
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Michele Del Zotto(Harvard Univ)
Masaki Shigemori(Kyoto Univ)
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They will give pedagogical talks about forefront of sting theory.
We also have local and short talk speakers:
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Akinori Tanaka (RIKEN)
Tetsuji Kimura (Tokyo Institute of Technology)
Tomoki Nosaka (Kyoto University)
Hironori Mori (Osaka University)
Yoshiki Sato (Kyoto University)
Hiroyuki Shimizu (Tokyo University)
Shotaro Shiba (Kyoto Sangyo University)
Sotaro Sugishita (Kyoto University)
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"Symposium on the Present and Future of iTHES" originally planned on June 15 (Mon), 2015
is postponed until Fall or Winter of this year from various constraints. We will announce the new date as soon as decided. Thanks for your understanding.
Tetsuo Hatsuda

## Paper of the week

The CP violation (the nonconservation of the charge conjugation and parity symmetry) is an important fundamental property of particle physics.
It is believed that the matter abundance of our Universe was generated at the early stage thanks to the CP violation.
There is an observable very sensitive to the CP violation: the electric dipole moment (EDM).
The EDM can be measured in a variety of systems.
Among them, the nuclear EDM is of particular interest, due to its high sensitivity on hadronic CP violation.
New experimental techniques to measure the nuclear EDM using storage rings are currently being developed.
In this paper, we have calculated for the first time the EDM of the $^6$Li nucleus within the ￥alpha + p + n three-body cluster model using the Gaussian expansion method, assuming the one meson exchange P, CP-odd nuclear forces.
It was found that the EDM of $^6$Li is 2 times more sensitive to the isovector pion exchange P, CP-odd nuclear force than the deuteron EDM, due to the CP-odd interaction between the nucleons and the $￥alpha$ cluster. The $^9$Be EDM was also calculated in the same framework as an $￥alpha$ + $￥alpha$ + n three-body system. We have also tested the ab initio calculation of the EDM of the deuteron, $^3$H and $^3$He nuclei using the realistic Argonne v18 nuclear force. In the ab initio calculations, good agreements with previous studies were obtained. We have finally discussed the prospects for new physics beyond the standard model.