Dr
Bao-Xi SUN
(IFIC, Universidad de Valencia)
6/14/11, 6:20 PM
Poster Session
poster
The $N\rho\rho$ three-body system has been studied within the framework of fixed center approximation of Fadeev equation, and the scattering amplitudes show a peak around 2200MeV. It manifests the interaction among $N\rho\rho$ system is strong enough to generate a bound state with a mass about 2200MeV. Moreover, another peak of the amplitudes appears at the higher energy range, which might...
David Garcia
(Instituto de Física, UNAM)
6/14/11, 6:20 PM
Poster Session
poster
The omega->3 pion process is known to be dominated by the omega-rho-pi transition, followed by the decay of the rho meson into two pions. However, this does not deny the possibility of the need of a contact term, as can be seen in other works, to reproduce the experimental value of the decay width of the omega meson into three pions.
In this work, we revisit the omega->3 pion process under...
Mr
Philipp Gubler
(Tokyo Institute of Technology)
6/14/11, 6:20 PM
Poster Session
poster
Charmonium spectral functions at finite temperature are investigated, using QCD sum rules in combination with the maximum entropy method. This approach makes it possible to directly obtain the spectral function from the sum rules, without having to introduce any specific assumption about its functional form. QCD sum rules incorporate finite temperature effects by the change of the various...
Mr
Ricardo Torres-Andres
(Universidad Complutense de Madrid)
6/14/11, 6:20 PM
Poster Session
poster
We analyze the order parameters of chiral and $SU_V(N_f)$ symmetry breaking, as well as their isoscalar and isovector susceptibilities. For that purpose, we include $m_u\neq m_d$ and electromagnetic corrections in a consistent leading order Chiral Perturbation Theory framework for $N_f=2,3$, providing model-independent predictions.
At zero temperature and assuming the QCD vacuum to have...
Mr
Michael Kunkel
(Old Dominion University)
6/14/11, 6:20 PM
Poster Session
poster
Experimental results on the Dalitz decay of P(π0, η, η’)->e+ e- γ pseudoscalar mesons produced in the photoproduction reaction γ + p -> P(π0, η,η’) + p on a Hydrogen target with CLAS are presented for the first time. The total statistics collected for η Dalitz decay exceeds the world’s published statistics by an order of magnitude, while the Dalitz decay of η’->e+ e- γ is observed and measured...
Dr
Frank Nerling
(University of Freiburg),
Johannes Bernhard
(Institut f. Kernphysik, JGU Mainz)
6/14/11, 6:20 PM
Poster Session
poster
The COMPASS experiment at CERN SPS is dedicated to the study of hadron
structure and spectroscopy. One goal of the physics programme using hadron beams is the search for new states, in particular the search for $J^{PC}$ spin-exotic states and glueballs. COMPASS has started to contribute to the puzzle of the existence of spin-exotic mesons by the published 2004 pilot run data, showing a...
Prof.
Alexander Glushkov
(Odessa University and Troitsl ISAN Russian Acad. Sci.)
6/14/11, 6:20 PM
Poster Session
poster
A negative muon captured by a metastable nucleus may accelerate the discharge of the latter by many orders of magnitude [1,2]. For a certain relation between the energy range of the nuclear and muonic levels a discharge may be followed by muon ejection and muon- participates in discharge of other nuclei. We present relativistic energy approach to a discharge of a nucleus with emission of gamma...
Mr
Miguel Albaladejo
(U. Murcia)
6/14/11, 6:20 PM
Poster Session
poster
The interactions between the f_0(980) and a_0(980) scalar resonances and the lightest pseudoscalar mesons are studied. The interacting kernels are obtained without including any ad hoc free parameter, thanks to previous results on the nature of the lightest scalar resonances as dynamically generated from the rescattering of S-wave two-meson scattering. The amplitudes are then unitarized, and...
Dr
Ju Jun Xie
(IFIC, University of Valencia)
6/14/11, 6:20 PM
Poster Session
poster
We perform a calculation for the three body NKbarK scattering amplitude by using the fixed center approximation to the Faddeev
equations, taking the interaction between N and Kbar, N and K, and Kbar and K from the chiral unitary approach. The resonant structures show up in the modulus squared of the three body scattering amplitude and suggest that a NKbarK hadron state can be formed. Our...
Andrea Lavagno
(Politecnico di Torino)
6/14/11, 6:20 PM
Poster Session
poster
We study the hadron yield ratios at finite value of baryon density and temperature by means of an effective relativistic mean-field model with the inclusion of the full octet of baryons, the Delta-isobars degrees of freedom and the lightest pseudoscalar and vector mesons. These last particles are considered in the so-called one-body contribution, taking into account of an effective chemical...
Ms
Regina Kleinhappel
(Graz University)
6/14/11, 6:20 PM
Poster Session
poster
We present a microscopic model for hadron resonances which contains, in addition to constituent (anti)quarks, mesonic degrees of freedom. It is assumed that the (anti)quarks are confined by an instantaneous potential and that the mesons can couple directly to the (anti)quarks. This system is treated within a relativistic coupled-channel formalism in order to take the dynamics of the mesonic...
Dr
Inti Lehmann
(University of Glasgow)
6/14/11, 6:20 PM
Poster Session
poster
Hadron multiplicities in semi-inclusive deep-inelastic scattering were measured on neon, krypton and xenon targets relative to deuterium at an electron-beam energy of 27.6 GeV at HERMES. These ratios were determined as a function of the virtual-photon energy nu, its virtuality Q^2, the fractional hadron energy z and the transverse hadron momentum p_t with respect to the virtual-photon...
Prof.
Motoo Sekiguchi
(Kokushikan University)
6/14/11, 6:20 PM
Poster Session
poster
The resonance of scalar meson is reported to exist in $K-\pi$ system with a mass of about 800 MeV. This meson is called the kappa meson and may constitute the nonet scalar state together with the sigma meson. In the quark model, the mass of scalar meson should be in the higher region. It is very important to investigate the kappa meson by lattice QCD in order to establish the mass spectroscopy...
Mr
Thiemo Nagel
(TUM)
6/14/11, 6:20 PM
Poster Session
talk
At the COMPASS experiment located at the Super Proton Synchrotron (SPS) at CERN, several weeks of the 2009 beam time have been dedicated to the measurement of soft processes in the scattering of 190 GeV/c pions off nuclear targets. Primakoff Compton scattering
pi- + Z ----> pi- + gamma + Z
i.e. production of a real photon through interaction of the beam pion with a quasi-real photon...
Monika Grothe
(U Wisconsin)
6/14/11, 6:20 PM
Poster Session
poster
Bose-Einstein correlations between identical particles are measured in samples of proton-proton collisions at sqrt(s) = 0.9 and 7 TeV. The signal is observed in the form of an enhancement of number of pairs of same-sign charged particles with small relative momentum. The dependence of this enhancement on kinematic and topological features of the event is studied.
Dr
Hiroaki Kohyama
(Chung Yuan Christian University)
6/14/11, 6:20 PM
Poster Session
poster
The Nambu Jona-Lasinio (NJL) model is one of the useful models of Quantum chromodynamics, and it describes observed meson properties nicely. In this talk, we study the nonet meson properties by using the NJL model with dimensional regularization at finite temperature and chemical potential. We find that the results of the meson properties show reasonable behaviors, which are similar to the...
Ms
Anna Skachkova
(JINR)
6/14/11, 6:20 PM
Poster Session
poster
The lepton pair production in collisions of antiproton beam (E_beam = 14 GeV) with proton target is studied on the basis of event samples simulated with PYTHIA6 generator. Considered the quark level subprocess which goes through the production of virtual photon which converts into lepton pair (q qbar --> gamma* --> l+l-). The distributions of different kinematical variables which may be...
Dr
Yanrui Liu
(Tokyo Institute of Technology)
6/14/11, 6:20 PM
Poster Session
poster
Exotic heavy quark hadrons near one or several two-body thresholds triggered lots of discussions about hadronic molecule problem in the heavy quark sector. Here the larger reduced mass reduces the kinetic energy and is advantageous for the bound state. It is interesting to investigate possible molecules containing the lowest charmed baryon, Lambda_c (Lc). We present the study of two systems,...
Mr
Jacobo Ruiz de Elvira
(Universidad Complutense)
6/14/11, 6:20 PM
Poster Session
poster
We extend the precise analysis of presently available pion-pion
scattering data up to 1.1 GeV published in Phys.Rev.D83:074004,2011,
by means of once subtracted Roy-like dispersion relations, twice subtracted Roy Equations,
and Forward Dispersion Relations. The use of once-subtracted dispersion
relations is essential to reduce uncertainties in the region around the K-Kbar...
Mrs
Raquel Molina
(IFIC)
6/14/11, 6:20 PM
Poster Session
poster
The interaction between various charmed mesons and charmed baryons is studied within the framework of the coupled-channel unitary approach with the local hidden gauge formalism. Several meson-baryon dynamically generated narrow N* and Λ* resonances with hidden charm are predicted with mass above 4 GeV and width smaller than 100 MeV. The predicted new resonances definitely cannot be...
Mr
Alexander Obrazovskiy
(Budker Institute of Nuclear Physics)
6/14/11, 6:20 PM
Poster Session
poster
Preliminary results on e^+e^- \to 3\pi, 4\pi, \omega \pi^0,
\eta \pi^+\pi^-, N\bar{N} cross sections measured
with SND detector at VEPP-2000 collider are reported.
The data were collected in 2010-2011 in the energy range
2E = 1.0 - 2.0 GeV, the total integrated luminosity used
is about 20 pb^{-1}.
Mr
Ajay Majethiya
(Department of Physics, Sardar Patel University,)
6/14/11, 6:20 PM
Poster Session
poster
Study of the heavy flavour hadrons containing either a charm quark or a
beauty quark has become a subject of recent interest due to the
observations reported by the experimental groups at Belle, BABAR,
DELPHI, CLEO, CDF etc;. Most of the new states observed in these
experimental facilities are within the heavy flavour sector with one or
more heavy flavour quark composition. In this paper,...
Guillermo Ríos
(Universidad Complutense de Madrid)
6/14/11, 6:20 PM
Poster Session
poster
We study the rho(770) and sigma(600) resonances by means of the Inverse Amplitude Method (IAM). The IAM is based on unitarity, analyticity and Chiral Perturbation Theory only and generates poles on the second Riemann sheet of pion-pion partial wave amplitudes associated to the resonances without any a priori assumptions on their existence or nature. In particular, we study the leading 1/N_c...
Dr
Olga Khetselius
(Odessa University)
6/14/11, 6:20 PM
Poster Session
poster
In the last few years transition energies in pionic and kaonic atoms have been measured with an unprecedented precision [1]. The spectroscopy of hadronic hydrogen allows to study the strong interaction at low energies [2] by measuring the energy and width of the ground level with a precision of few meV. The light hadronic atoms can additionally be used to define new low-energy X-ray standards...
Prof.
Javier Vijande
(university of Valencia)
6/14/11, 6:20 PM
Poster Session
poster
The problem of the stability of mesons and baryons against their decay into lighter hadrons has been widely discussed in the literature.
During the last years it has been suggested the potential role
played by higher-order many-quark configurations in the hadron
spectra. These terms are a reflection of the involved color structure present in hadrons and they might be described either in...
Dr
Kazem azizi
(Dogus University)
6/14/11, 6:20 PM
Poster Session
poster
The strong coupling constants of the heavy baryons to light pseudoscalar and vector mesons are calculated in light cone QCD sum rules. In particular, using the general form of the interpolating currents for the heavy baryons and distribution amplitudes of mesons as well as different symmetry arguments, all amplitudes in each class of transitions are written in terms of only one universal...
Ms
Chunyan LIU
(Institute of High Energy Physics)
6/14/11, 6:20 PM
Poster Session
poster
The mixing intensity of f0(980) and a0(980) is expected to shed light on the nature of these two resonances. The a0-f0 mixing intensity has been predicted to be in the range of 0.01 to 0.2 by various theoretical models, but no any experimental results available yet. The transition of f0(980) to a0(980) or a0(980) to f0(980) will provide complementary constraints to the parameters of a0 and f0...
Dr
Nadezhda Ladygina
(JINR)
6/14/11, 6:20 PM
Poster Session
poster
The $dp\to dp$ and $dd\to ^3He n$ reactions are considered in the
energy range from few hundred MeV up to 1 GeV. The approach
is based on the multiple-scattering theory, where the few-body
collisions are presented through two-body ones. The high-energy
nucleon-nucleon interactions are described by t-matrix, which
is parameterized in accordance with the modern phase-shift analysis data. ...
Mr
Johannes Bernhard
(Institut f. Kernphysik, JGU Mainz)
6/14/11, 6:20 PM
Poster Session
poster
The COMPASS experiment at CERN SPS completed its data taking with hadron beams ($p$, $\pi$, $K$) in the years 2008 and 2009 by collecting a large set of data on different targets ($H_2$, $Pb$, $Ni$, $W$). These data are dedicated to hadron spectroscopy, where the focus is directed to the search for exotic mesons and gluonic excitations. The production of such states is known to be favoured in...
Dr
Melahat Bayar
(Instituto de Fisica Corpuscular)
6/14/11, 6:20 PM
Poster Session
poster
We have performed a calculation of the scattering amplitude for the three body
system $\bar{K}NN$ assuming $\bar{K}$ scattering against a $NN$ cluster, using
the Fixed Center approximation to the Faddeev equations. The $\bar{K}N$ amplitudes,
which we take from chiral unitary dynamics, govern the reaction and we find a $\bar{K}NN$
amplitude that peaks around 30-40 MeV below the...
Jürgen Diefenbach
(Universität Mainz)
6/14/11, 6:20 PM
Poster Session
poster
Measurements of the ratio of the electric and magnetic form factors of
the proton yield different results when using the Rosenbluth or polarization transfer technique. This discrepancy has possibly been
explained by two photon exchange that is not accounted for in the Born
approximation. The OLYMPUS experiment will measure the ratio of the
cross sections of elastic $e^-p$ and $e^+p$...
Dr
Sergey Sukhoruchkin
(Petersburg Nuclear Physics Institute)
6/14/11, 6:20 PM
Poster Session
poster
The pion play an important in recent theoretical models including the
Effective Field Theory and the Constituent Quark Model with Goldstoune
Exchange Interaction. Nucleon interactions within nuclei are considered as
a result of one- and many-pion exchange.
The role of tensor forces connected with the pion exchange in the description
of nuclear binding energies and nuclear excitations was...
Mr
Miguel Albaladejo
(U. Murcia)
6/14/11, 6:20 PM
Poster Session
poster
We calculate the sigma or f0(600) meson scalar form factor, i.e., its interaction with a scalar source. We make use of the knowledge that the sigma meson appears as a pole in pion-pion scattering. NLO Chiral lagrangians are used to calculate the interaction. Knowing the scalar form factor, we try to determine the scalar radius of the sigma meson.
Mrs
Raquel Molina
(IFIC)
6/14/11, 6:20 PM
Poster Session
poster
We study the vector-vector interaction within the framework of the hidden gauge formalism for the channels with quantum numbers charm C=0 and strangeness S=0 in the energy region around 4000 MeV. By looking for poles in the complex plane we find three resonances that could be identified by the mass, width, and quantum numbers with the Y(3940), Z(3940), and X(4160), these poles appear with...
Prof.
Wolfgang Lucha
(HEPHY Vienna Austria)
6/14/11, 6:20 PM
Poster Session
poster
We show that the effective continuum threshold - one of the key parameters of the method of Borel sum rules for the calculation of properties of an isolated bound-state - is a complicated quantity. Although a constant approximation for the effective threshold is commonly used in the analysis of hadron observables within sum rules in QCD, the effective threshold in fact depends on the Borel...
Dr
Eliecer Hernandez-Gajate
(University of Salamanca)
6/14/11, 6:20 PM
Poster Session
poster
We evaluate the weak decays of doubly-charmed baryons.
We work in momentum space using the variational wave functions obtained in ref.[1]. We check our model results against heavy quark symmetry constraints.
[1] C. Albertus et al., Eur. Phys. J. A 32, 183 (2007)
