Conveners
Hadron Spectroscopy and Interactions
- Naruhito Ishizuka
Hadron Spectroscopy and Interactions
- Tomomi Ishikawa
Hadron Spectroscopy and Interactions
- Michael Endres
Hadron Spectroscopy and Interactions
- William Detmold
Hadron Spectroscopy and Interactions
- Chris Allton
Ben Hörz
(School of Mathematics, Trinity College Dublin)
14/07/2015, 14:00
Hadron Spectroscopy and Interactions
Talk
We present results on pion-pion scattering in the isovector channel from N_f = 2+1 CLS simulations with open temporal boundary conditions and m_\pi = 280 MeV. The required correlation functions are computed using the stochastic LapH method that facilitates large-volume calculations in order to maintain m_\pi L > 4. Mapping out the \rho resonance structure is a necessary step towards the...
Dr
John Bulava
(Trinity College Dublin)
14/07/2015, 14:20
Hadron Spectroscopy and Interactions
Talk
Results for pion-pion scattering phase shifts using the stochastic
LapH method on a single $N_f = 2+1$ anisotropic clover lattice with
$m_{\pi}\equiv 240\mathrm{MeV}$ and $L\equiv 3.8\mathrm{fm}$ will be presented. In particular, for $I=1$ this large volume enables good resolution of the $\rho$ resonance shape. Prospects for the other isospin channels will also be discussed.
Mr
Tadeusz Janowski
(University of Southampton)
14/07/2015, 14:40
Hadron Spectroscopy and Interactions
Talk
I will present preliminary results on K-pi scattering lengths in both I=3/2 and I=1/2 channels obtained by the RBC-UKQCD collaboration. The continuum results are obtained using two of our Moebius domain wall fermion ensembles - 48^3 x 96 and 64^3 x 128 - with physical quark masses.
I will demonstrate how the large finite time extent effects which are present with such light quark masses can...
Dr
Gordon Donald
(University of Regensburg)
14/07/2015, 15:00
Hadron Spectroscopy and Interactions
Talk
Results will be presented for pi-pi and K-pi scattering using lattice configurations on which the pion mass is 150 MeV.
In this study the focus is on the kinematic region around the rho (for pi-pi scattering) and K* (for K-pi) resonances.
Different lattice volumes and moving frames are used to obtain the spectrum for a range of centre of mass energies, which allows the energy dependence of...
Prof.
ying chen
(institute of high energy physics, chinese academy of sciences, china)
14/07/2015, 15:20
Hadron Spectroscopy and Interactions
Talk
We use overlap valence quarks on the $L^3\times T=48^3\times 96$ $N_f=2+1$ domain-wall fermion configurations generated by the RBC\&UKQCD Collaboration. The light sea quark mass is at the physical point and the spatial extension is 5.5 fm. The $\rho$ mass is precisely determined to be $m_\rho=778(9)$ MeV at the physical pion mass. We also propose a strategy to reduce the noise of the wall-wall...
Mr
Dehua Guo
(The George Washington University)
14/07/2015, 15:40
Hadron Spectroscopy and Interactions
Talk
We present a lattice calculation of the mass and width for the rho meson by determining the energy dependent phaseshift for pi-pi scattering in isospin-1, spin-1 channel in the elastic region. We compute the energy spectrum from spatially asymmetric boxes. We use Nf=2 nHYP fermions and generate two sets of ensembles with pion masses of 300MeV and 220MeV. To determine the energy spectrum we...
Dr
Brendan Fahy
(KEK)
14/07/2015, 16:30
Hadron Spectroscopy and Interactions
Talk
We report results of masses and decay constants of light and charmed psuedo-scalar mesons using lattice QCD with Moebius domain-wall fermions. Using this formulation we are able to compute psuedoscalar decay constants through the pseudo-scalar density operator as well as with the axial-vector current. Results are shown from several lattice spacings and pion masses between 240 MeV and 500 MeV....
Naoya Ukita
(University of Tsukuba)
14/07/2015, 16:50
Hadron Spectroscopy and Interactions
Talk
We present our preliminary results on 2+1 flavor QCD with the stout smeared O(a)-improved Wilson quark action and the Iwasaki gauge action. Simulations are carried out at a lattice spacing 0.085fm on a $96^4$ lattice with the quark masses near the physical point. The reweighing technique and ChPT are employed for the extrapolation to the physical point. We will show the preliminary results of...
Dr
Wolfgang Soeldner
(Regensburg University)
14/07/2015, 17:10
Hadron Spectroscopy and Interactions
Talk
We will report on latest results of the RQCD group obtained from 2+1f gauge field configurations with non-perturbatively improved Wilson action and open boundaries generated within the CLS effort. We have extended our simulations to include two chiral trajectories, one keeping the average quark mass fixed and an additional one where the strange quark mass is kept at its physical value. For the...
Dr
Hidenori Fukaya
(Osaka University)
14/07/2015, 17:30
Hadron Spectroscopy and Interactions
Talk
Calculation of the eta-prime mass is a notoriously difficult problem, as it requires evaluation of the disconnected diagram which is costly and noisy. In this work, we use a gluonic operator to extract the eta-prime state after smearing the link variables through the Wilson flow. With this choice, one can avoid a large cancellation of pion contribution between the connected and disconnected...
Dr
Michael Endres
(Massachusetts Institute of Technology)
14/07/2015, 17:50
Hadron Spectroscopy and Interactions
Talk
The commonly adopted approach for including QED in lattice QCD simulations introduces power-law finite volume corrections to physical quantities. These effects, which are due to the long-range nature of the electromagnetic interaction, must be removed by performing simulations at multiple lattice volumes, followed by an extrapolation to the infinite volume limit. In this work, we explore the...
Dr
Paul Rakow
(University of Liverpool)
14/07/2015, 18:10
Hadron Spectroscopy and Interactions
Talk
We present results on the pseudoscalar meson masses from
a fully dynamical simulation of QCD plus QED. We concentrate
particularly on the question of how to divide the measured
masses into a QED contribution and a QCD contribution.
This decomposition is not unique, it depends on the
renormalisation scheme and scale. We suggest a renormalisation
scheme in which Dashen's theorem...
Dr
William Detmold
(MIT)
15/07/2015, 14:00
Hadron Spectroscopy and Interactions
Talk
I will discuss the NPLQCD collaboration's recent calculations of the magnetic moments
and polarisabilities of light nuclei up to A=4 using background field methods. I will also describe an a calculation of the magnetic transition amplitude that determines the
$n p \to d \gamma$ cross section that is of central importance in Big Bang Nucleosynthesis.
Takeshi Yamazaki
(University of Tsukuba)
15/07/2015, 14:20
Hadron Spectroscopy and Interactions
Talk
We present our result of binding energy of light nuclei
with the nuclear mass number less than or equal to four
at the pion mass m_pi = 0.3 GeV.
The simulations are performed in N_f=2+1 QCD with Iwasaki gauge
and non-perturbative improved Wilson fermion actions at the
lattice spacing of a = 0.09 fm.
We discuss the quark mass dependence of the binding energies
using our previous results...
Dr
Parikshit Junnarkar
(Helmholtz Institut Mainz)
15/07/2015, 14:40
Hadron Spectroscopy and Interactions
Talk
We present preliminary results from a lattice QCD calculation of the H-dibaryon using two flavours of O(a) improved Wilson fermions. We employ six-quark interpolating operators with the appropriate quantum numbers of the H-dibaryon and also explore its couplings to two-baryon channels. To improve the overlap to the ground state two smearings are employed and a generalised eigenvalue problem is...
Dr
Amy Nicholson
(UC Berkeley)
15/07/2015, 15:00
Hadron Spectroscopy and Interactions
Talk
We determine scattering phase shifts for s,p,d, and f partial wave channels in two-nucleon systems using lattice QCD methods. We use a generalization of Luscher's finite volume method to determine infinite volume phase shifts from a set of finite volume ground- and excited-state energy levels on two volumes, V=(3.4 fm)^3 and V=(4.5 fm)^3. The calculations are performed in the SU(3)-flavor...
Dr
Marcus Petschlies
(HISKP, University of Bonn)
15/07/2015, 15:20
Hadron Spectroscopy and Interactions
Talk
We present an update of our investigation of hadronic decays of decuplet baryons using the transfer matrix method.
In addition to the benchmark decay Delta -> pi N we look at other channels, like Sigma^{*} -> pi Sigma and Sigma^{*} -> pi Lambda
to further test the reach of the method. Lattice calculations are done using a hybrid setup with domain wall fermions on a
staggered sea at pion...
Mingyang Sun
(University of Kentucky)
15/07/2015, 15:40
Hadron Spectroscopy and Interactions
Talk
We present our calculations of the Roper state obtained from a combination of spatially large interpolation fields. The calculation is carried out with overlap valence fermion on $2 + 1$-flavor domain-wall fermion configurations on the $24^3\times 64$ lattice with $a^{-1} = 1.73\,$GeV. Our result is consistent with that from the Sequential Bayesian method (SBM) on the same lattice, and with...
Dr
Takumi Doi
(RIKEN)
15/07/2015, 16:30
Hadron Spectroscopy and Interactions
Talk
One of the most important frontier in lattice QCD is the first-principles determination of baryon-baryon interactions. Our novel method, the HAL QCD method, has been shown to be effective for this objective, while the calculations so far employed unphysically heavy quark masses.
Under these circumstances, we have launched the new project to calculate baryon interactions in lattice QCD,...
Prof.
Noriyoshi for HAL QCD Collaboration Ishii
(Research Center for Nuclear Physics, Osaka University)
15/07/2015, 16:50
Hadron Spectroscopy and Interactions
Talk
Nucleaon-Nucleon interaction plays an essential role in nuclear
physics. In the same way, hyperon-hyperon interactions shold play an
important role in hyper nuclear physics. However, unlike the nucleons
who are quite stable, hyperons decay quickly so that the direct
scattering experiments are difficult. As a result, phenomenological
determination of hyperon potentials...
Dr
Kenji Sasaki
(CCS, University of Tsukuba)
15/07/2015, 17:10
Hadron Spectroscopy and Interactions
Talk
The determination of baryon-baryon interactions directly from QCD is highly awaited. Especially for the strangeness S=-2 two-baryon system, we can investigate the SU(3) structure and its breaking effect of baryon-baryon interactions because the flavor singlet combination is allowed only in this system.
Our approach is deriving a potential from coupled channel Schroedinger equation using...
Dr
Takumi Iritani
(Yukawa Institute for Theoretical Physics)
15/07/2015, 17:30
Hadron Spectroscopy and Interactions
Talk
Both HAL QCD and Luscher's finite volume methods are used to calculate the
hadron interactions from lattice QCD. However, there are some systematic
deviations between these methods.
In this talk, we investigate baryon interactions from both HAL QCD and
Luscher's finite volume methods using the same lattice setups. From systematic
comparison of these two techniques, we discuss the...
Mr
Takaya for HAL QCD Collaboration Miyamoto
(Yukawa Institute for Theoretical Physics, Kyoto University)
15/07/2015, 17:50
Hadron Spectroscopy and Interactions
Talk
Lambda_c (2286), the lightest baryon that contains
one charm quark, has been found at some experiments,
but its detailed properties such as the strength of the interaction
with the nucleon, including a possibility of forming
a deuteron-like bound state, are not known.
Due to the heavy quark symmetry, heavy baryons such as
Lambda_c (2286) sometimes show quite different behavior
from...
Dr
Yoichi Ikeda
(RIKEN)
15/07/2015, 18:10
Hadron Spectroscopy and Interactions
Talk
We study the candidate of charmed tetraquark Zc(3900) from full QCD simulation. The Zc(3900) was first reported by both BESIII and Belle Collaborations in pi J/psi invariant mass spectrum. After that, structure of the Zc(3900) is actively discussed using many phenomenological models. However, due to lack of information of the interactions of the pi J/psi and its coupled systems, the predicted...
Dr
Padmanath Madanagopalan
(University of Graz)
16/07/2015, 08:30
Hadron Spectroscopy and Interactions
Talk
I will discuss recent lattice study of charmonium-like mesons with
$J^{PC}=1^{++}$ and three quark contents $\bar cc\bar du$,
$\bar cc(\bar uu + \bar dd)$ and $\bar cc\bar ss$, where the latter
two can mix with $\bar cc$. In this quantum channel, the long known
exotic candidate, X(3872), resides. This simulation employs $N_f=2$,
$m_\pi=266~$MeV and a large basis of $\bar cc$,...
Dr
Krzysztof Cichy
(Goethe University Frankfurt)
16/07/2015, 08:50
Hadron Spectroscopy and Interactions
Talk
We present results from an on-going computation of masses of D mesons, D_s mesons and charmonium, including both ground states and several parity and angular momentum excitations. We employ 2+1+1 flavours of dynamical maximally twisted mass fermions at three lattice spacings and three u/d quark masses at each lattice spacing. We consider different combinations of valence quarks, with either...
Dr
Thomas Rae
(University of Wuppertal)
16/07/2015, 09:10
Hadron Spectroscopy and Interactions
Talk
We present a preliminary study of the charmed meson spectra using the electrically neutral subset of the new Budapest-Marseille-Wuppertal $N_f=2+1+1$ gauge configurations that utilise the 3-HEX smeared clover action. The analysis is performed with a focus on the hyperfine splitting.
Ms
Antje Peters
(Goethe-Universität Frankfurt am Main)
16/07/2015, 09:30
Hadron Spectroscopy and Interactions
Talk
We explore the possible existence of qq-anti-b-anti-b tetraquark
states, where qq denotes two up/down, strange or charm quarks. To this end we compute potentials of two static antiquarks in the presence of the two quarks qq of finite mass using lattice QCD. Then we check, whether these potentials are sufficiently attractive to host bound states. We find strong indication for a bound...
Mr
Joshua Berlin
(University of Frankfurt)
16/07/2015, 09:50
Hadron Spectroscopy and Interactions
Talk
The conjecture that several recently observed mesons have a structure, which is not dominated by an ordinary quark antiquark pair, but by a four-quark structure, is being actively investigated both theoretical and experimentally. Such a state maybe characterised as molecular state or as a diquark-antidiquark pair. Lattice QCD provides a theoretically sound framework to study such states. In...
