1824 June 2017
Palacio de Congresos
Europe/Madrid timezone
Hadron Spectroscopy and Interactions
Place
Location: Palacio de Congresos
Address: PALACIO DE CONGRESOS
Paseo del Violón s/n, 18006
Granada, SPAIN
Date:
from 19 Jun 14:30 to 23 Jun 19:10
Conveners

19 Jun 14:30  16:10
 Prof. Prelovsek, Sasa (University of Ljubljana)

19 Jun 16:40  18:00
 Dr. Shintani, Eigo (RIKENAICS)

20 Jun 17:10  19:10
 Prof. Lee, Frank (George Washington University)

21 Jun 09:00  11:00
 Yamazaki, Takeshi (University of Tsukuba)

22 Jun 15:00  16:40
 Prof. Luu, Thomas (Institute for Advanced Simulation 4, Forschunszentrum Jülich)

22 Jun 17:10  19:10
 Detmold, William (MIT)

23 Jun 15:00  16:40
 Wilson, David (Trinity College Dublin)

23 Jun 17:10  19:10
 Dr. Sasaki, Kenji (YITP, Kyoto University)
Timetable  Contribution List
Displaying 41
contributions
out of
41
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We present preliminary results for the masses and decay constants of the $\eta$ and $\eta^\prime$ mesons using CLS $N_f = 2+1$ ensembles.
One of the major challenges in these calculations are the large statistical fluctuations due to disconnected quark loops. We tackle these by employing a combination of noise reduction techniques which are tuned to achieve the optimal noise reduction per cost.
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Presented by Jakob SIMETH
on
20/6/2017
at
16:10
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We present a comparative analysis of various methods to study the $\rho \rightarrow \pi \pi$ resonance. We use $N_f=2+1$ of clover fermions at a pion mass of approximately $320$ MeV and a lattice size of approximately $3.6$ fm, to investigate two ways of determining the parameters of the elastic $\pi\pi$ scattering; one is by extracting infinite volume phase shifts using the L\"uscher analysis an
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Presented by Mr. Srijit PAUL
on
19/6/2017
at
15:00
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We give a status report for our large scale simulation of 2+1 flavor lattice QCD at the physical point. The configurations are generated with the stoutsmeared O(a)improved Wilson quark action and the Iwasaki gauge action. We present some preliminary physics results and discuss the benefit and the significance of a large spatial volume.
Presented by Prof. Yoshinobu KURAMASHI
on
22/6/2017
at
15:00
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
A stochastic source using a dilute grid of source points and incorporating momentumbased smearing is used to generate the correlation function of the proton at rest and in a boosted frame. The dependence of the error terms on the number of source points and source separation is studied. Calculations on a $24^3\times 48$ lattice demonstrate that this novel technique yields reduced statistical erro
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Presented by Dr. Jiajun WU
on
20/6/2017
at
15:10
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
The introduction of a uniform background magnetic field breaks threedimensional spatial symmetry for a charged particle. This makes standard quark operators inefficient at isolating the nucleon correlation function at nontrivial field strengths. We introduce novel quark operators constructed from the twodimensional Landau modes that describe a charged particle on a finite lattice. These Landau
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Presented by Dr. Waseem KAMLEH
on
19/6/2017
at
13:50
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
Hyperonnucleon and hyperonhyperon interactions are important in
studying the properties of hypernuclei in hypernuclear physics.
However, unlike the nucleons which are quite stable, hyperons are
unstable so that the direct scattering experiments are difficult,
which leads to the large uncertainty in the phenomenological
determination of hyperon potentials. I
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Presented by Prof. Noriyoshi ISHII
on
22/6/2017
at
13:40
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We present our recent results of baryon interactions with strangeness $S=1$ based on NambuBetheSalpeter (NBS) correlation functions calculated from lattice QCD with almost physical quark masses corresponding to $(m_\pi,m_K)\approx(146,525)$ MeV and large volume $(La)^4=(96a)^4\approx$ (8.1 fm)$^4$. In order to perform a comprehensive study of baryon interactions[1], a large number of NBS correl
... More
Presented by Dr. Hidekatsu NEMURA
on
22/6/2017
at
14:20
Baryon interactions from lattice QCD with physical quark masses  Nuclear forces and XiXi forces 
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
Firstprinciples determination of baryon interactions plays a crucial role to build a bridge between particle, nuclear and astrophysics. The first LQCD calculation of baryon forces with (almost) physical quark masses (m_pi=146 MeV) is in progress, where the interactions are extracted from NambuBetheSalpeter (NBS) correlators by the timedependent HAL QCD method. In this talk, we give a brief ov
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Presented by Takumi DOI
on
22/6/2017
at
13:20
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
Achieving long plateaus in multibaryon systems is challenging because excited states contaminate the signal at early times and the signal is destroyed by noise at late timesensuring there is enough time in between these two systematic effects is critical.
I will explain how optimizing singlebaryon observables can yield substantial improvements to multibaryon systems, dramatically extending
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Presented by Dr. Evan BERKOWITZ
on
22/6/2017
at
15:50
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
Comparison of radial excitation energies to masses show that
the velocity of b quark is very nonrelativistic in bottomonium states. In a
mixed system like charmed B meson, the b quark has less velocity than
it has in bottomonium states and in strange B meson it is even slower.
So one can use NRQCD for the b quark in those systems. Using overlap
action for the s and c quarks and NRQCD for b q
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Presented by Mr. Protick MOHANTA
on
21/6/2017
at
7:40
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
Many experiments have found evidence of charmoniumlike states that do not fit into conventional models of quarkantiquark mesons. Nonperturbative insight provided by lattice simulations can help in understanding the properties of those states. The computation of single and multiparticle correlators is the main challenge of the numerical investigation of unstable states on the lattice. We extract
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Presented by Dr. Stefano PIEMONTE
on
23/6/2017
at
14:20
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
There has been a lot of theoretical effort to unmask the pentaquark candidates, the $P_c^+$, since they were reported by LHCb collaboration in 2015. However, lack of knowledge in charmedhadron interactions seems to be causing controversy on this issue; some argue that they are looselybound mesonbaryon state, while others consider them as tightlybound states, threshold cusps, and so forth. In
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Presented by Mr. Takuya SUGIURA
on
23/6/2017
at
13:20
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
Recently, phase shift data for the $\rho$meson have been extracted from several $N_f = 2 + 1$ lattice simulations for different pion masses. We analyze the lattice data sets with Unitarized Chiral Pertubation Theory. Chiral extrapolations are performed to postdict experimental phase shift data, and also compared with the ones obtained from the analysis of $N_f = 2$ lattice data. The lowenergy
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Presented by Dr. Raquel MOLINA
on
20/6/2017
at
16:30
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We investigate a systematic error coming from higher excited state
contributions in the binding energy of light nucleus by comparing
two different source calculations with the exponential and
wall sources. Since it is hard to obtain a clear signal of the wall source
correlation function in a plateau region, we employ a large quark mass
as the pion mass is 0.8 GeV in quenched QCD. We discuss t
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Presented by Takeshi YAMAZAKI
on
22/6/2017
at
16:10
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We compute hybrid static potentials in SU(3) lattice gauge theory. We present a method to automatically generate a large set of suitable creation operators with defined quantum numbers from elementary building blocks. We show preliminary results for several channels and discuss, which structures of the gluonic flux tube seem to be realized by the ground states in these channels.
Presented by Mr. Christian REISINGER
on
23/6/2017
at
14:00
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
I will discuss recent coupledchannel scattering calculations from the Hadron Spectrum Collaboration. Utilising the variational method with large bases of operators, including those that resemble qqbar and mesonmeson like constructions, many energy levels can be extracted. These spectra are then used with the coupledchannel extensions of Lüscher's finite volume formalism, to determine the infi
... More
Presented by David WILSON
on
19/6/2017
at
12:50
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
The lowestlying glueballs are investigated from $N_f=2$ QCD study on aniostropic lattices. Utilizing the gluonic operators built from Wilson loops to calculate the corresponding correlation functions, we obtain that in the tensor channel, the ground state mass to be $2.367(35)$ GeV and $2.380(61)$ GeV at $m_\pi∼938$ MeV and $650$ MeV, respectively. In the pseudoscalar channel, when we use the g
... More
Presented by Mr. Wei SUN
on
20/6/2017
at
17:30
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We present results of a lattice calculation of heavylight tetraquark states with charm & bottom quarks in the heavy sector and up & down quarks in light sector while the strange quark appears interchangeably in both sectors. The calculation employs the highly improved staggered quark action (HISQ) as adopted by the MILC collaboration in the sea sector and overlap action in the valence sector. The
... More
Presented by Dr. Parikshit JUNNARKAR
on
23/6/2017
at
16:30
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We compute the mass splittings between pseudoscalar mesons using Nf=2+1+1 staggered lattice configurations at pion and kaon masses around their respective physical values. We include the ud mass difference and QED effects in the valence sector.
Presented by Dr. Balint TOTH
on
21/6/2017
at
8:40
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We investigate baryonbaryon (BB) interactions via the timedependent
HAL QCD method which enables us to derive potentials from
NambuBetheSalpeter (NBS) wave function simulated on the lattice.
The simulations are performed with (almost) physical quark masses
($m_\pi=146$ MeV) and a huge lattice volume of La = $8.1$fm.
We report the latest results of BB potentials and their scattering
o
... More
Presented by Dr. Kenji SASAKI
on
22/6/2017
at
14:00
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We used BoriciCreutz fermion to study discrete chiral symmetry breaking at strong coupling in 2dim GrossNeveu model and mass spectra in 2dim field theories. Mixed action lattice QCD study with BoriciCreutz valence quarks on staggered sea quarks is carried out. The counter terms are fixed nonperturbatively to restore the broken symmetries. The effects of partial quenching and unitarity violat
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Presented by Dr. Subhasish BASAK
on
21/6/2017
at
7:00
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
Lattice QCD simulations of multibaryon correlation functions can determine structure and reactions of nuclei without encountering the baryon chemical potential sign problem. However, they suffer from a signaltonoise problem where Monte Carlo estimates of observables have quantum fluctuations that are exponentially larger
than their average values. Recent lattice QCD results demonstrate that th
... More
Presented by Michael WAGMAN
on
22/6/2017
at
15:10
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We perform hybrid Monte Carlo simulation of lattice QCD with $N_f=2+1+1 $ optimal domainwall quarks on the $ 32^3 \times 64 $ lattice with lattice spacing $ a \sim 0.06 $~fm, and generate 3 gauge ensembles with pion masses 280400 MeV. We compute the pointtopoint quark propagators, and measure the timecorrelation functions of meson and baryon interpolators.
The mass spectra of the lowestlyi
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Presented by Prof. TingWai CHIU
on
21/6/2017
at
7:20
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We report on our progress with the ongoing study of exotic, heavy tetraquark states, $qq’ \bar Q\bar Q’$. With regards to the previously reported $\bar Q\bar Q’=\bar b\bar b$ case, we have significantly increased our statistics
by computing and saving more propagators on publicly available dynamical $n_f =2+1$ WilsonClover gauge configurations, generated by the PACSCS collaboration, with
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Presented by Dr. Anthony FRANCIS
on
23/6/2017
at
15:50
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We demonstrate the efficacy of the stochastic LapH method to treat alltoall quark propagation on a $N_\mathrm{f} = 2+1$ CLS ensemble with large linear spatial extent $L = 5.5 \, \mathrm{fm}$ and $m_\pi L = 6.2$. Employing interlace16 dilution in Laplacian eigenvector space, we obtain the benchmark elastic isovector $p$wave pionpion scattering amplitude to good precision already on a relativel
... More
Presented by Ben HÖRZ
on
19/6/2017
at
12:30
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
In this talk I will present results from our recent lattice QCD study of $N\pi$ scattering in the positiveparity
nucleon channel, where the puzzling Roper resonance $N^*(1440)$ resides in experiment. Using a variety
of hadron operators, that include $qqq$like, $N\pi$ in $p$wave and $N\sigma$ in $s$wave, we systematically
extract the excited lattice spectrum in the nucleon channel up to 1.65
... More
Presented by Dr. Padmanath MADANAGOPALAN
on
19/6/2017
at
13:10
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We obtain the shortdistance limit behavior of the nonperturbative definitions, in terms of Wilson loops, of the $1/m$ potential and of the $1/m^2$ spinindependent velocitydependent heavy quarkonium potentials, with ${\cal O}(\alpha^3)$ and ${\cal O}(\alpha^2)$ accuracy, respectively. These results require a nonperturbative evaluation of ultrasoft effects. The outcome can be compared with latt
... More
Presented by Dr. Antonio PINEDA
on
23/6/2017
at
13:40
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
On the basis of the L¥"uscher's finite volume formula, a simple test (sanity check) is introduced and applied to inspect the recent claims of the existence of the nucleonnucleon ($NN$) bound state(s) for heavy quark masses in lattice QCD. We show that the consistency between the scattering phase shifts at $k^2 > 0$ and/or $k^2 < 0$
obtained from the lattice data and the behavior of phase s
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Presented by Prof. Sinya AOKI
on
22/6/2017
at
16:30
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
A new implementation of estimating the twototwo Kmatrix from finitevolume energies based on the Luescher formalism is described. The method includes higher partial waves and multiple decay channels, and the fitting procedure properly includes all covariances and statistical uncertainties. The method is also simpler than previously used procedures. Formulas and software for handling total sp
... More
Presented by Prof. Colin MORNINGSTAR, Dr. John BULAVA
on
22/6/2017
at
15:30
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We derive Lüscher phaseshift formulas for both mesonmeson and mesonbaryon scattering according to the symmetry of lattices elongated in one of the dimensions. Boosting in the elongated direction is also considered. The results are compared with those on the cubic lattice.
Presented by Prof. Frank LEE
on
23/6/2017
at
13:00
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We present preliminary results on the positive and negative parity light and charmed baryon spectra using overlap valence quarks on MILC's 2+1+1 flavour HISQ gauge configurations. These calculations are performed on three different gauge ensembles at lattice spacings (a=0.12 fm, 0.09 fm and 0.06 fm) and for physical strange and charm quark masses. For the coarse lattice we use lightest pion mass a
... More
Presented by Prof. Nilmani MATHUR
on
21/6/2017
at
8:00
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
The lattice QCD simulations of charmed states with $J^{PC} = 1^{++} $ have been performed in this study. Particularly, $X(3872)$ was investigated. The narrow state $X(3872)$ was discovered by the Belle Collaboration in B decay and subsequently confirmed by the BaBar Collaboration. Both the CDF and the $D0$ Collaboration saw a clear signal of inclusive $X(3872)$ production in pp collision. Since
... More
Presented by Ms. Olga SOLOVJEVA
on
23/6/2017
at
15:30
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We study tetraquark resonances with lattice QCD potentials computed for two static quarks and two dynamical quarks, the BornOppenheimer approximation and the emergent wave method of scattering theory. As a proof of concept we focus on systems with isospin I = 0, but consider different relative angular momenta l of the heavy b quarks. We compute the phase shifts and search for S and T matrix poles
... More
Presented by Prof. Pedro BICUDO
on
23/6/2017
at
17:10
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We present results for the eta' meson and the topological susceptibility in Nf=2 flavour lattice QCD. The results are obtained using Wilson twisted mass fermions at maximal twist with pion masses ranging from 250 MeV down to the physical point. A comparison to literature values is performed giving a handle on discretisation effects. Eventually, the error scaling is investigated towards the physica
... More
Presented by Prof. Carsten URBACH
on
20/6/2017
at
15:50
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
It has been observed that lattice QCD calculations of the nucleon mass show a strikingly linear dependence upon the pion mass such that $m_N[\textrm{MeV}] = 800 + m_\pi$ is a remarkably good _lattice phenomenological_ estimate of the nucleon mass at a given pion mass for pion masses in the range $170 \leq m_\pi \leq 800$ MeV. If the _goodness_ of this extrapolation persists to the physical pion
... More
Presented by Dr. Andre WALKERLOUD
on
19/6/2017
at
13:30
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
Within the last year it has been proposed that an exotic tetraquark state composed of two $b$quarks and two $\bar{b}$quarks could exist sufficiently far below the $2\eta_b$ threshold so to be found experimentally at the LHC. Such a state would be particularly clean theoretically because of its heavy quark content and, if it really is too light to decay to $2\eta_b$, annihilation and threshold ef
... More
Presented by Dr. Ciaran HUGHES
on
23/6/2017
at
16:10
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
Progress is presented on an ongoing effort to determine
pionpion scattering amplitudes using multiple lattice spacings, pion masses, and physical volumes. The isovector elastic $p$wave pionpion scattering phase shift and the isovector timelike pion form factor are
calculated using the stochastic LapH treatment of alltoall quark propagators on a selection of $N_{\mathrm{f}} = 2+1$ CLS ense
... More
Presented by Dr. John BULAVA
on
19/6/2017
at
17:20
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
Results are presented from an ongoing study of the $\rho$ resonance. We use the distillation approach in order to create correlator matrices involving $\rho$ and $\pi\pi$ interpolators. The study is done in a centreofmass frame and several moving frames. We are able to extract energy levels by solving the
GEVP of those correlator matrices. The current study focusses on CLS 2flavour lattices wi
... More
Presented by Mr. Felix ERBEN
on
19/6/2017
at
15:40
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
We present results on the light hadron spectrum and related quantities, obtained by RQCD on $N_f=2+1$ flavour CLS ensembles of nonperturbatively ordera improved Wilson fermions, employing open boundary conditions in time, Configurations at five different values of the lattice spacing, ranging from 0.086 fm down to below 0.04 fm, exist and many quark mass combinations are analysed, in particular
... More
Presented by Dr. Wolfgang SOELDNER
on
21/6/2017
at
8:20
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
In lattice QCD, both direct and HAL QCD potential methods are employed to study hadron interactions.
In the direct method, the eigenenergy of twobody system is obtained from the temporal correlation function. The scattering phase shift is calculated by Luscher's finite volume formula, which should agree with HAL QCD method. However, for twonucleon systems at heavier pion mass, there are differ
... More
Presented by Dr. Takumi IRITANI
on
22/6/2017
at
18:50
Type: Parallel
Session:
Hadron Spectroscopy and Interactions
Track: Hadron Spectroscopy and Interactions
The first principle calculation of hadronhadron interaction is an important step toward the understanding of nuclear physics from QCD. The HAL QCD method is largely contributing to this purpose by making it possible to calculate nuclear potentials in lattice QCD. In this talk, we present results of \pi\pi potentials extracted in 2+1 flavor lattice QCD at m_\pi =410 MeV, using alltoall propagato
... More
Presented by Mr. Daisuke KAWAI (FOR HAL QCD COLLABORATION)
on
19/6/2017
at
14:40