2019 LANL-SWME Collaboration Meeting

16 Dec 2019, 09:30 → 20 Dec 2019, 19:30 Asia/Seoul

Building 56 Room 521 (Seminar Room) (Seoul National University (SNU))

Workshop on Lattice QCD and Particle Physics

Precision measurements are an essential part of modern particle physics. Precise determination of the free parameters of the standard model (SM) leads to testing the SM and searching for signals of new physics. As particle physics at the precision frontier is becoming more and more interdisciplinary, the goal of this workshop is to bring together different communities in an informal and invigorating setting, with a limited number of talks per day and plenty of opportunity for discussion and collaboration.

Topics include:

• Lattice QCD
• Flavor Physics
• BELLE and BELLE2 Experiments
• Particle Physics Phenomenology

The venue: 

The venue is Building 56 Room 521 (Seminar Room) at SNU. Department of Physics and Astronomy is located in Building 56, 22, and 23 beside the main library of SNU.

Acknowledgement: 

This workshop is supported by the BK21+ Program of Frontier Physics Research Division and by the World-leading University Fostering Program of SNU.

Monday, 16 December

09:30 → 12:00 Morning Session

09:30 Update on Results From Fermilab Lattice and MILC Collaborations

I will review some of the recent results from the Fermilab Lattice and MILC Collaborations. I may also say something about our future plans. Topics may include quark masses, flavor physics, and g-2.

Speaker: Steven Gottlieb (Indiana University)

Gottlieb_Seoul.pdf

10:30 Coffee Break

11:00 The B to D*lv semileptonic decay at non-zero recoil from the Fermilab/MILC collaborations

In this. talk we show the current status of the B to D*lv calculation at non-zero recoil, carried out within the Fermilab and MILC collaborations. We present an overview of the calculation and we show the current preliminary results. We also emphasize some pitfalls we have encountered during the project.
Our analysis includes 15 MILC asqtad ensembles with N_f=2+1 flavors of sea quarks, and lattice spacings ranging from a=0.15 fm to a=0.045 fm. The light valence quarks use the asqtad action, whereas the heavy quarks are treated using the Fermilab action.

Speaker: Alejandro Vaquero Avilés-Casco (University Of Utah)

Vaquero.pdf

12:00 → 13:00 Lunch Break

13:00 → 14:00 Coffee Break

14:00 → 17:00 Afternoon Session

14:00 Semileptonic B decays at Belle

In this talk, we present recent results of semileptonic decays of B mesons from the Belle experiment. We will cover both the CKM-related results (i.e. Vub, Vcb) and the semi-tauonic decays, B -> D(*) tau nu.

Speaker: Youngjoon Kwon (Yonsei University)

SNU_Belle_Y.Kwon.pdf

14:45 Prospects of the Belle II experiment

I will discuss the present status of the Belle II experiment and future prospects. The presentation includes the early physics results we have produced and discussion on future sensitivity of new physics beyond standard model.

Speaker: Eunil Won (Korea University)

2_Mon_afternoon_Belle-II_SNU.pdf

15:30 Coffee Break

16:00 Holographic light dilaton

We study a holographic dual of near conformal dynamics. Using gauge-gravity duality, we calculate the mass of light dilaton and derive of the scale anomaly. Finally we show that the PCDC hypothesis holds in the holographic dual.

Speaker: Deog Ki Hong (Pusan National University)

h_dilaton_snu.pdf

17:00 → 18:00 Coffee Break

18:00 → 19:00 Dinner

The place will be anounced

Tuesday, 17 December

09:30 → 12:00 Morning Session

09:30 Lattice QCD calculations using the coordinate-space method

Lattice QCD plays an important role in the high-intensity frontier and precision flavor physics. High precision requires the development of new ideas and methods in the lattice QCD calculations. In this talk, I will discuss the coordinate-space method and introduce our recent work on the calculations of hadron-mass splitting, neutrinoless double beta decay, pion charge radius and pi0 -> two photon decays et. al.

Speaker: Xu Feng (Peking University)

1_Tues_morning_SNU_talk_Feng.pdf

10:30 Coffee Break

11:00 Current Status of epsilon_K and V_cb in lattice QCD

A review on the recent progress in epsilon_K and V_cb in lattice QCD will be presented.

Speaker: Weonjong Lee (Seoul National University)

2_Tuesday_morning_wlee.pdf

12:00 → 13:00 Lunch Break

13:00 → 14:00 Coffee Break

14:00 → 17:00 Afternoon Session

14:00 Current improvement with the Oktay-Kronfeld action

Speaker: Jaehoon Leem (KIAS)

1__Tues_afternoon_jhleem_swme_lanl.pdf

14:45 Neutron electric dipole moment on the lattice

Neutrons can have nonvanishing electric dipole moment (EDM) when the theory has broken P and T symmetries. Since the CP violation (CPV) arising from the standard model (SM) is small or strongly suppressed at high temperature, new CPV from beyond the SM (BSM) is needed to explain the baryogenesis, and EDMs of elementary particles, such as the neutron, are good probes of such BSM physics. In this talk, I will present results for contributions to the neutron EDM arising from the QCD theta-term, the Weinberg three-gluon operator and the quark chromo-EDM from our ongoing lattice calculations using clover valence quarks on the MILC HISQ lattices.

Speaker: Boram Yoon (Los Alamos National Laboratory)

2_Tues_afternoon_yoon-EDM.pdf

15:30 Coffee Break

16:00 Dark pion DM : WIMP vs. SIMP

Scale invariant extension of the SM with QCD-like strongly interacting hidden (dark) sector is interesting, since the dimensional transmutation and chiral symmetry breaking in the hidden sector could be the origin of electroweak symmetry breaking (EWSB), and all the masses of the SM particles as well as dark pions and dark baryons that could be good cold dark matter candidates. In this talk I will discuss dark pion DM as WIMP vs. SIMP. Ignoring the West-Zumio-Witten (WZW) interaction, I first discuss dark pion as a WIMP using two different approaches, the chiral perturbation theory (ChPT) and AdS/QCD. Then I include the WZW interaction and discuss dark pion within SIMP scenario. However, the analysis based on ChPT indicates that the viable parameter space for SIMP seems to be outside the validity region of ChPT. I show that this problem can be resolved if we include dark vector mesons, and the SIMP idea can be realized in the dark pion sector.

Speaker: Pyungwon Ko (Korea Institute of Advanced Study)

3_Tues_afternoon_SNU2019_pko.pdf

17:00 → 18:00 Coffee Break

18:00 → 19:00 Dinner

The place will be anounced

Wednesday, 18 December

09:30 → 12:00 Morning Session

09:30 Machine learning for the lattice QCD

Speaker: Boram Yoon (Los Alamos National Laboratory)

1_Wendes_morning_yoon-ML.pdf

10:30 Coffee Break

11:00 b->c semileptonic decays and phenomenology

There are a number of long-standing discrepancies between observables in b->c semileptonic decays and their Standard Model predictions. In addition there is the long-standing tension between inclusive and exclusive determinations of Vcb, the latter being obtained from these same decays. Here I will discuss state-of-the-art lattice simulations addressing these issues. After reviewing the status of B->D(*) form factors I will discuss in more detail new results from HPQCD that treat the 'b' quark fully relativistically.

Speaker: Andrew Lytle (INFN)

2_Wendes_morning_Lytle_LANL-SWME_v2.pdf

12:00 → 13:00 Lunch Break

13:00 → 14:00 Coffee Break

14:00 → 17:00 Afternoon Session

14:00 Lattice QCD thermodynamics in heavy dense regime

The straightforward Monte Carlo simulation to Investigate the QCD phase diagram in finite termperature and baryon chemical potential is prohibited by the sign problem due to the complex fermion determinant. Indirect method can explore the low density region $\mu_B \le 3T$, where the sign problem is not severe. Rewriting the action can make the sign problem mild. Hence, we introduce the effective theoey and as a first step, we present the SU(3) spin model which is a effective model of Polyakov loop for QCD at finite temperature and density. After that we introduce the effective 3D model which is combined strong coupling expansion and hopping parameter expansion for QCD in heavy dense regime.

Speaker: Jangho Kim (Goethe University Frankfurt am Main)

1_Wendes_afternoon_Jangho.pdf

14:45 SU(4)/Sp(4) composite Higgs on the lattice

Speaker: Jong-Wan Lee (Pusan National University)

2_Wendes_afternoon_lattice_CH_sp4.pdf

15:30 Coffee Break

16:00 Dark Axion Portal

I will talk about a portal that connects the dark sector particles (axion and dark photon) to the bright sector particle (photon).

Speaker: Hye-Sung Lee (KAIST)

3_Wendes_afternoon_Dark Axion Portal (SNU 2019).pdf

17:00 → 18:00 Coffee Break

18:00 → 19:00 Dinner

The place will be anounced

Thursday, 19 December

09:30 → 12:00 Morning Session

09:30 Zero modes and chiral Ward identities for staggered fermions

Speaker: Mr Hwancheol Jeong (Seoul National University)

10:00 Data analysis for the pion mass spectrum of improved staggered fermions

Speaker: Jeonghwan Pak

10:30 Coffee Break

11:00 Chirality calculation improvements using Intel MKL BLAS routine

Speaker: Sunghee Kim (Seoul National University)

11:30 TBA

Speaker: Benjamin Jaedon Choi

12:00 → 13:00 Lunch Break

13:00 → 18:00 Excursion 1

18:00 → 19:00 Dinner

The place will be anounced

Friday, 20 December

09:30 → 12:00 Morning Session

09:30 TBA

Speaker: Mr Sunkyu Lee (SNU (Seoul National University))

10:00 Semileptonic B to D(*)lv Decays Form Factors using the Oktay-Kronfeld Action

Speaker: Seungyeob Jwa (SNU)

10:30 Coffee Break

11:00 TBA

Speaker: Jeehun Kim (Seoul National University)

11:30 Machine learning in physicist language : feature extraction and Complex Arithmetic Logic Unit

Speaker: Chanju Park (Seoul National University)

12:00 → 13:00 Lunch Break

13:00 → 18:00 Excursion 2

18:00 → 19:00 Dinner

The place will be anounced