2019 USQCD All-Hands Collaboration Meeting

Apr 26, 2019, 12:00 AM → Apr 27, 2019, 7:00 PM US/Eastern

Large Seminar Room (BNL Physics Department)

Aida El-Khadra (UIllinois), Alexei Bazavov (University of California/University of Iowa), David Richards (JLAB), Ethan Neil (UColorado Boulder), Jack Laiho (SyracuseU), Keh-Fei Liu (UKentucky), Meifeng Lin (Brookhaven National Laboratory)

USQCD is a collaboration of U.S. scientists developing and using large-scale computers for calculations in Lattice Quantum Chromodynamics (QCD). 

For more details, please see the USQCD webpage: https://www.usqcd.org/. 

***PLEASE NOTE: All non-U.S. citizens and U.S. citizens that would like to attend must have an active Guest Information System (GIS) profile. Please visit www.bnl.gov/guv/gis.php and submit a form at your earliest convenience in order to gain access to the laboratory.***

Fri, April 26

8:30 AM → 8:45 AM Welcome

Speaker: Berndt Mueller (BNL)

8:45 AM → 9:00 AM SPC Opening

Speaker: Aida El-Khadra (UIllinois)

SPC Opening.pdf

9:00 AM → 9:20 AM LQCD HEP Project

Speaker: William Boroski (Fermilab)

Boroski-LQCD-HEP-Project.pdf

9:20 AM → 9:35 AM BNL Facility

Speaker: Tony Wong (Brookhaven National Lab (Physics Department))

AHM_2019.pdf

9:35 AM → 9:50 AM FNAL Facility

Speaker: Amitoj Singh (Fermilab)

USQCD-AHM-2019-FNAL-SiteReport.pptx

9:50 AM → 10:20 AM LQCD NP Project + JLAB

Speaker: Chip Watson (JLAB)

AllHands-JLab-2019.pdf

10:20 AM → 10:50 AM Break

10:50 AM → 11:20 AM The US EIC

Speaker: Abhay Deshpande (Stony Brook University & BNL)

Deshpande-EIC.pptx

Deshpande-EIC-R.pdf

11:20 AM → 11:40 AM Hot QCD

Speaker: Patrick Steinbrecher (BNL)

ahm19.pdf

11:40 AM → 11:55 AM Honoring Frithjof Karsch

Speakers: Peter Petreczky (BNL), Norman Christ (Columbia University)

allhands19.pdf

11:55 AM → 12:25 PM EC Report

Speakers: Andreas Kronfeld (Fermilab), Robert Edwards (JLAB)

AHM.pdf

12:25 PM → 12:55 PM EC Discussions

12:55 PM → 1:55 PM Lunch (on your own)

2:00 PM → 2:30 PM SPC Summary: Flavor + g-2

Speaker: Jack Laiho (SyracuseU)

Laiho.pdf

2:30 PM → 2:50 PM NP Wilson Coefficients

Speaker: Masaaki Tomii (Columbia University)

slide1.pdf

2:50 PM → 3:10 PM B->D* Form Factors and Vcb

Speaker: Alejandro Vaquero (The Cyprus Institute)

Vaquero.pdf

3:10 PM → 3:30 PM QCD + QED

Speaker: Luchang Jin (Columbia University)

bnl-usqcd-ahm2019.pdf

3:30 PM → 4:30 PM Poster Session w/ Coffee

3:30 PM Step scaling functions for N_f=12 and 10 with Moebius Domain Wall fermions

We perform numerical simulations to determine the discrete beta-function for an SU(3) system with 10 and 12 fundamental flavors using stout-smeared Moebius domain-wall fermions. Project by Anna Hasenfratz, Claudio Rebbi, Oliver Witzel.

Speaker: Claudio Rebbi (Boston University)

3:35 PM Investigation of near-conformal anomalous dimensions using gradient-flow RG

As the number of fermion degrees of freedom in a gauge theory increases, a phase
transition is known to occur to an infrared-conformal phase lacking confinement and
chiral symmetry breaking. Uncovering the nature of this transition and the properties
of the non-trivial four-dimensional CFTs occurring inside the “conformal window” is a
long-standing and active research question in lattice gauge theory, with deep connec-
tions to composite models of new physics. We propose a set of calculations to determine
the spectrum of anomalous dimensions for SU(3) gauge theory with N f = 10 fundamen-
tal fermions, using a new method we have developed based on the gradient flow that
allows a continuous Monte Carlo Renormalization Group procedure.

Speaker: Anna Hasenfratz (UColorado Boulder)

3:40 PM Grid QCD code: performance portability

This is a poster presented at the Annual ECP meeting in January, 2019. It summarizes the progress of porting Grid to GPUs.

Speaker: Meifeng Lin (Brookhaven National Laboratory)

3:45 PM Higgs-Yukawa model with reduced staggered fermions

We explore the phase structure of a four dimensional $SO(4)$ invariant lattice Higgs-Yukawa model comprising four reduced staggered fermions interacting with a real scalar field.The fermions belong to the fundamental
representation of the symmetry group while the three scalar field components transform in the self-dual representation of $SO(4)$. The model is a generalization of a four fermion system with the same
symmetries that has received recent attention because of its unusual phase structure comprising massless and massive symmetric phases separated by a very narrow phase in which a small
bilinear condensate breaking $SO(4)$ symmetry is present. The generalization described in this paper simply consists of the addition of a scalar kinetic term. We find a region of the enlarged phase diagram
which shows no sign of a fermion condensate or symmetry breaking but in which there is nevertheless evidence of a diverging correlation length. Our results in this region are consistent with the presence of
a single continuous phase transition separating the massless and massive symmetric phases observed in the earlier work.

Speaker: Nouman Butt (Syracuse University)

3:50 PM Neutrino Nucleon Scattering and Hadronic Tensor

The direct lattice calculation of hadronic tenor is helpful to the neutrino-nucleus scatterings in all the elastic, resonance and shallow inelastic scattering (SIS) regions. In this poster, we will briefly introduce the framework of calculating hadronic tenor on the lattice. Preliminary numerical results show that fine lattice spacings are crucial to our calculation.

Speaker: Jian Liang (University of Kentucky)

3:55 PM Nucleon Mass with All-HISQ Fermions

Speaker: Aaron Meyer (Brookhaven National Lab)

4:00 PM Nim metaprogramming for performance, portability, and productivity

The Nim programming language has an extensive metaprogramming capability. With the help of Nim's AST-based metaprogramming, we are building a framework where the application code is as high-level as in Python, and the low-level architecture specific code is compartmentalized. This allows us to target OpenMP, CUDA, and OpenCL for supported architectures. Here we describe our ongoing process of converting our CPU only lattice field theory framework QEX (Quantum EXpressions) as an effort of the ECP application team, and compare the performance of key math kernels with multiple backends, including OpenMP with target device offloading, CUDA, and OpenCL. We show how a LISP-like macro system in Nim, combined with its feature rich type system, helps keep us mostly at a high level, while allowing us to dig in to the performance kernels and influence the C or C++ code generated by Nim.

Speaker: Xiao-Yong Jin (RIKEN Advanced Institute for Computational Science)

4:05 PM Semileptonic B- and D-meson form factors on the (2+1+1)-flavor HISQ ensembles

Speaker: Zechariah Gelzer (University of Illinois at Urbana--Champaign)

4:10 PM Strong coupling constant and heavy quark masses in (2+1) flavor QCD

I present a determination of the strong coupling constant and heavy quark masses in (2+1)-flavor QCD using lattice calculations of the moments of the pseudo-scalar quarkonium correlators at several values of the heavy valence quark mass with Highly Improved Staggered Quark (HISQ) action.
I determine the strong coupling constant in MSbar scheme at four low energy scales corresponding to m, 1.5m, 2m and 3m , Nf =3, with m being the charm quark mass.
From these I obtain ΛMSbar = 301 ± 16 MeV, which is equivalent
to αs (μ = MZ , Nf = 5) = 0.1161(12).
I confirm this result with a recent determination of the strong coupling constant from the static energy using the same ensembles.

Speaker: Johannes Heinrich Weber (Technische Universität München)

4:30 PM → 4:50 PM SPC Summary: Nucleon MEs

Speaker: Keh-Fei Liu (UKentucky)

K-F_Liu.pdf

4:50 PM → 5:10 PM 0nubb

Speaker: David Murphy (Columbia University)

0vbb_usqcd_ahm_2019.pdf

5:10 PM → 5:30 PM Quark-Gluon Structure

Speaker: Sergey Syritsyn (RBRC)

Syritsyn_LHPC.pdf

5:30 PM → 5:50 PM Hadron Spectroscopy

Speaker: Robert Edwards (JLAB)

edwards_usqcd_19.pdf

5:50 PM → 6:00 PM First Day Closing

7:00 PM → 10:00 PM Event Dinner (personal pay)

Sat, April 27

8:45 AM → 9:05 AM SPC Summary: PDFs

Speaker: David Richards (JLAB)

SPC_PDF_2019.pdf

9:05 AM → 9:25 AM Quasi GPD

Speaker: Martha Constantinou (Temple University)

quasi_GPDs_2019_Constantinou.pdf

9:25 AM → 9:45 AM loffe-time Distributions

Speaker: Joe Karpie (William & Mary)

JK_USQCD_BNL_2019.pdf

9:45 AM → 10:05 AM Neutrino-nucleon Scattering

Speaker: Jian Liang (University of Kentucky)

HT_Jian_all-hands.pdf

10:05 AM → 10:25 AM Gluon PDFs and GPDs

Speaker: Huey-Wen Lin (Michigan State University)

hwlin_USQCD.v1.pdf

10:25 AM → 10:50 AM Break

10:50 AM → 11:20 AM Quantum Computing

Speaker: Yannick Meurice (University of Iowa)

usqcd19.pdf

11:20 AM → 11:40 AM SPC Summary: BSM

Speaker: Ethan Neil (UColorado Boulder)

spc-bsm-review-19.pdf

11:40 AM → 12:00 PM Sextet BSM Model

Speaker: Julius Kuti (U.C. San Diego)

Kuti.pdf

12:00 PM → 12:30 PM Data Management

Speaker: Jim Simone (Fermilab)

AHM_present_DM.pdf

12:30 PM → 1:00 PM Software Developments

Speaker: Carleton DeTar (University of Utah)

AHM_General.pdf

1:00 PM → 1:10 PM Collaboration Meeting Closing

1:10 PM → 2:00 PM Lunch (personal pay)

2:00 PM → 7:00 PM Software Meeting

Convener: Richard Brower (BostonU)

2:00 PM ECP Software: Meeting the Exascale FOM

Speaker: Carleton DeTar (University of Utah)

AHM_Software.pdf

2:15 PM Grid multi-platform evolution

Speaker: Peter Boyle (University of Edinburgh)

USQCD_sfw.pdf

2:55 PM DWF HMC: MSPCG, EOFA, (RM,LA)HMC, etc

Speaker: Chulwoo Jung (Brookhaven National Laboratory)

USQCD19_DWF.pdf

3:25 PM Coffee Break

3:35 PM The Roadmap to QUDA 1.00

Speaker: Kate Clark(remote) (NVIDIA)

usqcd_april_2019.pdf

3:55 PM NVSHMEM for Strong Scaling QUDA

Speaker: Mathias Wagner(remote) (NVIDIA)

QUDA_NVSHMEM_USQCD_201904.pdf

4:15 PM Julia, CUDA and Containers

Speakers: Alexei Strelchenko (Fermilab), Jim Simone (Fermilab)

Strelchenko.pdf

4:30 PM QEX

Speaker: James Osborn(remote) (ANL)

talk.pdf

4:45 PM Clover miscellany: Gauge Generation, Multigrid, Summit and more

Speaker: Balint Joo(remote) (JLab)

USQCDAHM2019-BJoo.pdf

5:15 PM Development of OpenMP/OpenACC

Speaker: Meifeng Lin (Brookhaven National Laboratory)

Lin.pdf

6:00 PM Self-organized Dinner for those staying overnight