Conveners
Hadron Spectroscopy and Interactions
- Sinya Aoki (Kyoto University)
Hadron Spectroscopy and Interactions
- Chuan Liu (Peking University)
Hadron Spectroscopy and Interactions
- Sinead Ryan (Trinity College Dublin)
Hadron Spectroscopy and Interactions
- Akaki Rusetski
Hadron Spectroscopy and Interactions
- Gunnar Bali (Universität Regensburg)
Hadron Spectroscopy and Interactions
- Sasa Prelovsek
Hadron Spectroscopy and Interactions
- Nilmani Mathur
-
Sasa Prelovsek (University of Ljubljana, Jozef Stefan Institute, University of Regensburg)17/06/2019, 14:20Hadron Spectroscopy and InteractionsParallel
Belle experiment discovered two tetraquark candidates $Z_b(10610)$ and $Z_b(10650)$ with flavor structure $\bar bb\bar du$ in 2011. We present the lattice study of the $\bar bb\bar du$ system in the approximation of static $b$ quarks. The ground and the excited eigenstates are extracted as a function of separation $r$ between $b$ and $\bar b$. The lower eigenstates at small $r$ are...
Go to contribution page -
Tomasz Korzec (University of Wuppertal)17/06/2019, 14:40Hadron Spectroscopy and InteractionsParallel
Lattice QCD Simulations with Nf=2+1 dynamical quark flavors are quite common and,
Go to contribution page
due to the decoupling of the charm quark, sufficient for the study of low energy physics with energies far below the charm threshold. However when used in studies of charm physics, the quenching of the heavy quarks may introduce large uncontrolled systematic uncertainties. To assess how big these effects might be... -
Nilmani Mathur17/06/2019, 15:00Hadron Spectroscopy and InteractionsParallel
We present the results of a lattice calculation of four-quark states with quark contents $q_1q_2\bar{Q}\bar{Q}, \, q_1,q_2 \subset u,d,s,c$ and $Q \equiv b,c$ in both spin one ($J=1$) and spin zero ($J=0$) sectors. For the spin one states we find that for both doubly heavy quarks and particularly for the doubly bottom quarks the ground state energy levels are below their respective...
Go to contribution page -
Sinead Ryan (Trinity College Dublin)17/06/2019, 15:20Hadron Spectroscopy and InteractionsParallel
Preliminary results for the spectra of excited and exotic hidden and open bottom mesons are presented. The calculation on dynamical anisotropic ensembles exploits distillation enabling the use of a large basis of interpolating operators including operators proportional to the gluonic field strength which are relevant for hybrid states. A comparison of results with similar calculations in the...
Go to contribution page -
Brian Colquhoun (York University)17/06/2019, 15:40Hadron Spectroscopy and InteractionsParallel
The likelihood that doubly-heavy tetraquarks will be strong-interaction stable is already suggested by features of heavy baryon phenomenology, and confirmed by recent lattice results. Phenomenological input in this case is possible because the light-quark configurations present in a putative tetraquark state are also present in heavy baryons. There are, however, additional light-quark...
Go to contribution page -
Mr Christian Walther Andersen (University of Southern Denmark)17/06/2019, 16:30Hadron Spectroscopy and InteractionsParallel
Preliminary results are presented for nucleon-pion scattering amplitudes in the $I=3/2$ channel. The calculations are performed on a set of $N_\text{f} = 2+1$ Wilson clover ensembles generated by the CLS initiative with pion masses down to $m_\pi = 200\text{MeV}$ where the $\Delta(1232)$ state is unstable. The required hadron correlation functions are efficiently evaluated using the stochastic...
Go to contribution page -
Maximilian Ammer (University of Wuppertal)17/06/2019, 16:50Hadron Spectroscopy and InteractionsParallel
We present technical details of an analysis of pseudo-scalar data from a
Go to contribution page
QCD simulation with staggered fermions. The data were obtained close to
the physical point with an inverse lattice spacing of about 3 GeV, and
$N_f=2+1+1$. We compare different methods of extracting effective masses
and decay constants in lattice units. The results of several correlated
and uncorrelated fitting methods... -
Fernando Romero-López18/06/2019, 14:20Hadron Spectroscopy and InteractionsParallel
The Large $N_c$ limit is often invoked in phenomenological approaches. Even though it is a useful simplification of QCD, the systematic uncertainties of these large-$N_c$-inspired approximations to QCD remain unclear. Moreover, it fails in some observables, such as the ratio of isospin amplitudes in the $K \to \pi \pi$ weak decays. In this context, lattice QCD has a lot of yet unexplored...
Go to contribution page -
Gumaro Rendon (University of Arizona)18/06/2019, 14:40Hadron Spectroscopy and InteractionsParallel
Parameterizing low-lying scalar resonances remains a challenge. Such is the case for $K^{\star}_{0}(700)$ for which the near threshold experimental results for the corresponding $K\pi$ scattering amplitude are limited. However, production channel data, e.g. $D\to K\pi\pi$, from experiments BES and E791 show clearer evidence of the existence of this resonance. I will present our results for the...
Go to contribution page -
David Wilson (Trinity College Dublin)18/06/2019, 15:00Hadron Spectroscopy and InteractionsParallel
Recent results will be presented of computations of meson-meson scattering processes in several partial waves containing unstable resonances. We will cover $\pi K$ scattering at several pion masses from arXiv:1904.03188, and an extraction of the $b_1$ resonance seen in dynamically-coupled $^3S_1$-$^3D_1$ $\pi\omega$ scattering coupled to $\pi\phi$, from arXiv:1904.04136.
Go to contribution page -
Chris Culver (George Washington University)18/06/2019, 15:20Hadron Spectroscopy and InteractionsParallel
The pion-pion channel is the benchmark for lattice QCD scattering calculations. In the isospin limit, three channels describe $\pi\pi$ scattering completely, having distinct properties in each channel. The attractive $I=0$ and $I=1$ channels are dominated by the broad $\sigma$ and narrow $\rho$ resonances, respectively, while the $I=2$ channel has no low energy resonance. Our group has...
Go to contribution page -
Daniel Hoying (UConn/BNL)18/06/2019, 15:40Hadron Spectroscopy and InteractionsParallel
We present updated results on the scattering of pseudoscalar, vector,
Go to contribution page
and scalar mesons on a physical pion mass, 2+1 flavor mobius-DWF,
ensemble with periodic boundary conditions (PBCs) generated by the RBC
and UKQCD collaborations. Using all-to-all propagators, we produce
thousands of correlator momentum combinations. Energy spectra and phase
shifts, including excited states, are then... -
Roman Höllwieser (University of Wuppertal)18/06/2019, 16:30Hadron Spectroscopy and InteractionsParallel
We present first results of the scale setting for QCD with $N_f=3+1$ dynamical quarks on the lattice. We use a recently proposed massive renormalization scheme with a non-perturbatively determined clover coefficient. To relate the bare coupling of the simulations to a lattice spacing in fm, we use decoupling of charm at low energy and the value of a dimensionless quantity...
Go to contribution page -
Yan Li (University of Chinese Academy of Sciences)18/06/2019, 16:50Hadron Spectroscopy and InteractionsParallel
Hamiltonian effective field theory has been used for explaining Lattice data. We develop it within partial waves mixing in the rest frame. The dimension of the Hamiltonian can be highly reduced with the partial wave cut-off and rotation symmetry. We apply this method to extract the Pion-Pion s-, d- and f-wave phase shifts within Isospin=2 case.
Go to contribution page -
Jiajun Wu (University of Chinese Academy of Sciences)18/06/2019, 17:10Hadron Spectroscopy and InteractionsParallel
In the two body system, the S matrix in the infinite volume is defined in the rest system, while to obtain more spectra in finite volume, people extract the energy spectrum of finite volume in the moving system. As a result, it needs momentum transformation to connect the energy spectrum in the moving finite volume and the S matrix in the infinite volume. In this work, we find a general...
Go to contribution page -
Mr Martin Ueding (University of Bonn, Germany)18/06/2019, 17:30Hadron Spectroscopy and InteractionsParallel
We present results of our study of the rho resonance properties based on
Go to contribution page
N_f=2+1+1 gauge configurations produced by the ETMC. We investigate the p-wave
phase shift for a range of pion mass values from about 200 to about 400 MeV and
for three values of the lattice spacing. We perform an extrapolation to the
chiral and continuum limit and extract resonance mass and width at the physical
point. -
Sinya Aoki (Kyoto University)19/06/2019, 11:10Hadron Spectroscopy and InteractionsParallel
We report recent theoretical and practical progresses in the HAL QCD potential method, which are summarizewd as follows.
Go to contribution page
(1) The explicit definition of the potential in terms of the derivative expansion.
(2) The construction of Hermite potentials from non-Hermite potentials.
(3) HAL QCD potentials from NBA wave fucntions in the moving systems.
(4) The partial wave decompositions on the finite... -
Takeshi Yamazaki19/06/2019, 11:30Hadron Spectroscopy and InteractionsParallel
We observe that the ratio of the on-shell scattering amplitude to
Go to contribution page
the Bethe-Salpeter (BS) wave function outside the interaction range
is almost independent of time in our quenched calculation of the I=2
two-pion scattering with almost zero momentum. In order to discuss
the time independence, we present a relation between the two-pion
scattering amplitude and the surface term of the BS... -
Yutaro Akahoshi (Yukawa Institute for Theoretical Physics, Kyoto University)19/06/2019, 11:50Hadron Spectroscopy and InteractionsParallel
In this talk, we show recent developments in the HAL QCD method including quark annihilation processes. We apply the hybrid method for all-to-all propagators, which combines a low-mode spectral decomposition of the quark propagator and noisy estimators for remaining high modes, to the HAL QCD potential for the first time. Using this combination, we investigate the $I=1,2$ $\pi \pi$...
Go to contribution page -
Takumi Doi19/06/2019, 12:10Hadron Spectroscopy and InteractionsParallel
First-principles determination of baryon interactions plays a crucial role to build a bridge between particle, nuclear and astro-physics. In this talk, we will give an overview for our recent calculations at m_pi = 0.27 GeV, where the interactions are extracted from Nambu-Bethe-Salpeter (NBS) correlators by the time-dependent HAL QCD method. We also discuss quark mass dependence of baryon...
Go to contribution page -
Mr Yin Lin (University of Chicago)20/06/2019, 14:00Hadron Spectroscopy and InteractionsParallel
We will present the first ever determination of the nucleon spectrum using HISQ valence quarks in combination with the (2+1+1) MILC-HISQ sea quarks ensembles at the physical point. We performed analyses with both Bayesian and GEVP methods to demonstrate control over excited states, and three lattice spacings, $\sim$0.15fm, $\sim$0.12fm, and $\sim$0.09fm, were used to extrapolate to continuum....
Go to contribution page -
Prof. Gunnar Bali (Universität Regensburg)20/06/2019, 14:20Hadron Spectroscopy and InteractionsParallel
We present continuum limit results of the quark mass dependence of octet and decuplet baryon masses. These are obtained on large volumes, employing three different trajectories in the quark mass plane, including the physical point. The five different lattice spacings reach down to below 0.04 fm. This became possible by introducing open boundary conditions in time at the smaller lattice...
Go to contribution page -
Prof. Ting-Wai Chiu (National Taiwan Univ, National Taiwan Normal Univ, Academia Sinica)20/06/2019, 14:40Hadron Spectroscopy and InteractionsParallel
Using a cluster of Nvidia DGX-1 (8*V100 interconnected by the NVLink), TWQCD Collaboration has generated the first gauge ensemble of $N_f=2+1+1 $ lattice QCD with physical domain-wall quarks, on the $ L^3 \times T = 64^3 \times 64 $ lattice with lattice spacing $a \sim 0.064 $~fm ($ L > 4 $ fm, and $ M_\pi L > 3 $). The gauge ensemble constitutes of ~200 gauge configurations, resulting from...
Go to contribution page -
Yoshinobu Kuramashi (University of Tsukuba)20/06/2019, 15:00Hadron Spectroscopy and InteractionsParallel
We investigate finite size effect on hadron masses and decay constants using a subset of the PACS10 configurations which are generated keeping the space-time volumes over (10 fm)^4 at the physical point in 2+1 flavor QCD with the Wilson-type quarks. We have tried two kinds of analyses fixing the $\kappa$ values or the measured axial Ward identity quark masses. The finite size effect is...
Go to contribution page -
Prof. James Zanotti (University of Adelaide)20/06/2019, 15:20Hadron Spectroscopy and InteractionsParallel
The low-lying hadron spectrum has been of tremendous phenomenological significance in resolving the nature of quark masses in strong interaction dynamics. In particular, the pseudoscalar mesons provide the foundation of the framework of chiral perturbation theory, the low-energy effective theory of QCD. Modern lattice calculations of pure QCD now provide excellent precision in the resolution...
Go to contribution page -
Yunheng Ma (Institute of High Energy Physics)20/06/2019, 16:10Hadron structureParallel
The charmonium-like hybrid mesons with $J^{PC}=(0,1,2)^{-+}$ and $1^{--}$ are investigated on anisotropic lattices in the quenched approximation. For these states, we construct spatially extended operators by splitting the $\bar{c}\Gamma c B$-type operators into two parts ($c\bar{c}$ and the chromo-magnetic field strength $B$) with different spatial distances $r$. In the Coulomb gauge, the...
Go to contribution page -
Jana N. Guenther (University of Regensburg)20/06/2019, 16:30Hadron structureParallel
To perform high precision calculations in lattice QCD for observables of physical interest, it is important to determine the lattice spacing with high accuracy. A convenient choice for scale setting is the observable $w_0$ which is based on the Wilson flow. However the value of $w_0$ is not determined experimentally and therefore the value of $w_0$ in physical units has to be be computed by...
Go to contribution page -
Nodoka Yamanaka (Riken)20/06/2019, 16:50Hadron Spectroscopy and InteractionsParallel
The glueballs in the SU(N) Yang-Mills theory are good candidates of dark matter.
Go to contribution page
An important feature to be discussed is the scattering between dark matter particles, which is constrained by observational data such as the galactic collisions.
In this work, we evaluate the interglueball potential in SU(2), SU(3), and SU(4) lattice gauge theories using the HALQCD method and derive the glueball... -
Prof. Zhi-Hui Guo (Hebei Normal University)20/06/2019, 17:10Hadron Spectroscopy and InteractionsParallel
I will discuss my recent works on the determination of resonance properties from the lattice energy levels using the chiral effective field theory.
Go to contribution page -
Faisal Etminan (University of Birjand)Hadron Spectroscopy and InteractionsParallel
We study $S$-wave interactions in the $I\left(J^{p}\right)=1/2\left(1/2^{-}\right)$
Go to contribution page
$\Lambda_{c}K^{+}-pD_{s}$ system on the basis of the coupled-channel
HAL QCD method. The potentials which are faithful to QCD S-matrix
below the $ pD^{*} $ threshold are extracted from Nambu-Bethe-Salpeter
wave functions on the lattice. For the simulation, we employ the (2+1)-flavor
gauge configurations on a...