Search

The surface plasmon resonance (SPR) phenomenon has been observed on the silver-coated prism and Fe3O4 magnetic nanoparticles for detecting plant’s DNA. Fe3O4 nanoparticles were synthesized using temperature of 30°C and they were coated with PEG4000. The composite of Fe3O4+PEG4000 has a function as a DNA binding active layer and for optimizing the detection ability of SPR. SPR-based biosensor in this work using Kretschmann configuration and He-Ne laser beam (λ = 632.8 nm). The plant’s DNA used in this study has ratio 1.828. The plant’s DNA could be detected by SPR-based biosensor with the ratio of composite Fe3O4 : PEG4000 is 1:1. This work was done for the earlier study to approve that SPR can be used to detect DNA with the active layer on it (in this case: composite Fe3O4+PEG4000). Thus, the shift of SPR-angle was influenced by the DNA ratio, concentration of Fe3O4 and its refractive index.

We develop a practical method to analyze the mixing structure of hadrons consisting of two components of quark composite and hadronic composite by taking the a1(1260) meson as an example. We also make reference to the large Nc procedure and its limitation for the classification of such a mixed state.

We will measure the x‐rays from kaonic 3He and 4He 3d→2p transition by using silicon drift detectors. Our precision goal is set to 1 eV to provide crucial information on the kaon‐nucleus strong interaction in the low energy limit. The experiment is to be performed as one of the first experiment in the J‐PARC hadron facility (J‐PARC E17). An overview and the present status of the experiment are presented.

We present an experimental study of Λ(1405) via the in‐flight (K−,n) reaction on the deuteron target (J‐PARC E31). We will measure all Σ+π−, Σ−π+ and Σ0π0 final states so that the isospin structure of the produced hyperon resonance state can be decomposed. In this report, we present an overview of the experiment and preparation status.

In the framework of a chiral soliton model (χSM), the complete mass splittings of SU(3) baryons are investigated, the isospin and SU(3) flavor symmetry breaking being simultaneously considered with a “model‐independent approach”. The dynamical quantities appearing in the expressions for the masses are adjusted to the masses of the baryon octet, the decuplet baryon Σ* and the masses of Θ+ and N* as inputs rather than by extracting them from a calculated self‐consistent soliton profile. We estimate the masses of the baryon decuplet and antidecuplet without any further adjustable free parameter and it turns out that calculated mass values of the baryon decuplet are in very good agreement with experimental data.

The proton structure corrections to the hyperfine splittings in electronic and muonic hydrogen are evaluated using the Breit potential with electromagnetic form factors. In contrast to other methods, the Breit equation with q{sup 2} dependent form factors is just an extension of the standard Breit equation which gives the hyperfine splitting Hamiltonian. Precise QED corrections are comparable to the structure corrections which therefore need to be evaluated ab initio.

The structure of baryon resonances is discussed in the dynamical approach with chiral symmetry. Defining the compositeness of a bound state through the field renormalization constant in Yukawa theory, we show that the bound state generated by an energy‐independent interaction is a purely composite particle, while the energy dependence of the chiral interaction induces some elementary component through the renormalization procedure. The quantitative measure of the compositeness clarifies the molecule structure of the bound state in the natural renormalization scheme, introduced by the constraint on the loop function.

Properties of some open and hidden charm exotic states which have been studied using the composite model are summarized. It is found that, their decay properties are consistent with the data and further data are necessary to discriminate the hadronic molecular interpretation from other interpretations.

A description of fragmentation processes of quarks into hadrons is presented in the framework of the recently developed NJL‐jet model, where the momentum and isospin sum rules are satisfied naturally. We present the results for pion, kaon and nucleon fragmentation functions, and compare the results with the empirical functions.

We derive nuclear forces and nuclear density saturation from large Nc QCD, by applying AdS/CFT correspondence of string theory, called holographic QCD. This is made possible by a new description of a multi‐baryon system in the holographic QCD. The description employs a matrix quantum mechanics which can be derived via the correspondence. This talk is based on collaboration work with N. Iizuka and P. Yi [1], with N. Iizuka [2, 3] and with T. Morita [4].

We summarize the work [1] where we studied the few body system made of several ρ(770) mesons. Based on the very strong interaction of two ρ(770) vector mesons in spin 2 and isospin 0, we show that the resonances ρ3(1690) (3−−), f4(2050) (4++), ρ5(2350) (5−−) and f6(2510) (6++) can be interpreted as few body systems made of an increasing number of ρ(770) particles. The fixed center approximation of the Faddeev equations is used in order to write the multi‐body interaction in terms of the elementary two‐body scattering amplitudes. Very good agreement with the experimental masses is found. An extension of the model to include also the interaction with K*(895) is discussed.

The deep inelastic scattering of leptons off nuclei is studied within the the Bethe‐Salpeter formalism. It is shown that nuclear short‐range structure can be expressed in terms of the nucleon structure functions and four‐dimensional Fermi motion of the nucleons. The four‐dimensional Fermi motion broadens the bound nucleon localization area, what leads to the observation of the nucleon structure change in nuclei—EMC effect. The 4He to deuteron structure functions ratio is found in good agreement with experimental data. It is shown that the pattern of the ratio is defined by dynamical properties of the nucleon structure and four‐dimensional geometry of the bound state.

In this talk, chiral scale, 4{pi}f{sub {pi}{approx}1} GeV, was introduced as an indicator of partial restoration of chiral symmetry at finite density or temperature, rather than the argument between mass shift and collisional broadening. We use the finite energy sum rules to determine the chiral scale identified with the separation scale of the low-energy resonance part from the high-energy continuum part of {rho}-meson spectral function. In this framework, in-medium {rho}-meson mass should be discussed in terms of the first two moments of the spectral function.

We derive hadronic chiral Lagrangian from PNJL model by using bosonization method. Bosonization is based on path integral, quark fields are integrated out by introducing the auxiliary fields. By its nature, this method is difficult to apply the problem of three bodies, but it is stand up for two‐bodies. Hence this method usually have been applied meson theory. We attempt bosonization to be enlarged including baryon in two‐color scheme. The obtained model which has chiral symmetry and quark confinement property apply to finite temperature and density, and find out the thermodynamical property. We make a comparison with lattice QCD sumilation in two‐color at finite density.

We have applied the coupled‐channel Complex Scaling Method (ccCSM) to the excited baryon Λ(1405) which is the important building block of kaonic nuclei. Λ(1405) is treated as a resonant state of the meson‐baryon coupled system, KN and πΣ. In this article, it is reported that the ccCSM works well even with an energy‐dependent KN potential such as a chiral SU(3)‐based potential. We have tested two cases: the self‐consistency condition is imposed on I) real energy and II) complex energy. Then, the self‐consistent solutions are obtained in both cases in the framework of the ccCSM.

We present a theoretical update for the inclusive charm production in deep inelastic scattering. From the soft‐gluon resummation at the threshold we derive all the threshold‐enhanced contributions of the gluon coefficient function for the charm structure function F2c at the next‐to‐next‐to‐leading order. Some numerical results are presented.

We study the dependence of “vector” and “axial‐vector” boson masses (mesons and diquark baryons with JP = 1±) on the baryon density μB for two‐color QCD. We show that the baryonic axial‐vector boson has a finite vacuum expectation value (VEV) at the finite μB where the U(1)B symmetry is spontaneously broken. We also find that the VEV causes the mixing between “vector” and “axial‐vector” bosons. As a result of the mixing, our model can reproduce the μB dependence of “(axial‐) vector” boson masses shown by the lattice data.

The role of the tensor meson K2*(1430) exchange is investigated in the kaon photoproduction within the Regge framework. Inclusion of the K2* exchange with the meson‐baryon coupling constants chosen from the SU(3) symmetry reproduces the cross sections in good agreement with the experimental data. This shows the importance of the tensor meson exchange in the present process.

After some historical overview, we discuss a systematic approach to the nuclear force on the basis of the lattice QCD simulations of the equal‐time Nambu‐Bethe‐Salpeter amplitude.

The Mainz Microtron MAMI is an ideal facility to study the hadron structure with the electromagnetic probe. With the new accelerator stage, the Harmonic Double‐Sided Microtron (HDSM), which is in operation since 2007, high‐intensity polarized electron and photon beams with energies up to 1.6 GeV are delivered to the experiments. Polarized proton, deuteron, 3He targets, and recoil proton polarimeters are available to allow a broad range of polarization observables for low‐mass nucleon resonances to be measured. In this talk, an overview over selected recent double polarization experiments at MAMI is given.

Three‐quark nucleon interpolating fields in QCD have well‐defined SUL(3)×SUR(3) and UA(1) chiral transformation properties, viz. [(6,3)⊕(3,6)], [(3,3)⊕(3,3)], [(8,1)⊕(1,8)] and their “mirror” images, Ref. [1]. It has been shown (phenomenologically) in Ref. [2] that mixing of the [(6,3)⊕(3,6)] chiral multiplet with one ordinary (“naive”) and one “mirror” field belonging to the [(3,3) ⊕ (3,3)], [(8,1) ⊕ (1,8)] multiplets can be used to fit the values of the isovector (gA(3)) and the flavor‐singlet (isoscalar) axial coupling (gA(0)) of the nucleon and then predict the axial F and D coefficients, or vice versa, in reasonable agreement with experiment. In an attempt to derive such mixing from an effective Lagrangian, we construct all SUL(3)×SUR(3) chirally invariant non‐derivative one‐meson‐baryon interactions and then calculate the mixing angles in terms of baryons’ masses. It turns out that there are (strong) selection rules: for example, there is only one non‐derivative chirally symmetric interaction be...

We extend the Polyakov‐loop extended Nambu–Jona‐Lasinio (PNJL) model by introducing an effective four‐quark vertex depending on the Polyakov loop. The effective vertex generates entanglement interactions between the Polyakov loop and the chiral condensate. The new model is consistent with lattice QCD data at imaginary quark‐number chemical potential and real and imaginary isospin chemical potentials. We investigate the influence of the entanglement interactions on the location of the critical endpoint at real quark‐number chemical potential.

We study quark-pair creations in strong color electromagnetic fields. We point out that, for massless quarks, the vacuum persistency probability per unit space-time volume is zero, i.e., the quark-pair creation rate w is infinite, in general homogeneous color electromagnetic fields, while it is finite when the color magnetic field is absent. We find that the contribution from the lowest Landau level (LLL) dominates this phenomenon. With an effective theory of the LLL projection, we also discuss dynamics of the vacuum decay, taking into account the back reaction of pair creations., Comment: 4 pages, 1 figure, contribution to the proceedings of International conference on the structure of baryons (BARYONS'10), RCNP, Osaka, Japan, Dec. 7-11, 2010; fig.2 deleted

We have developed the Silicon Strip Detector (SSD) for the experiment to measure X‐ray from Ξ‐atom. The feature of the SSD is to measure positions of particles and energy deposit. We have carried out the test experiment at J‐PARC K1.8 beam line. The three SSDs were installed in front of the target and we tested by using kaon beam. In this paper, the results of the test experiment is presented.

The search of the QCD critical point is one of the interesting issues both in theoretical and experimental particle physics. In this article, we use the Nambu Jona‐Lasinio model to study the UV‐cutoff effects on the critical surface which may play a crucial role to the possible existence/non‐existence of the critical point. Then we compare the indications between the results obtained through our effective approach and the lattice QCD simulations.

We present ongoing and future measurement of spin‐azimuthal asymmetries in semi‐inclusive production of pions in deep inelastic scattering using the CLAS detector at the Thomas Jefferson National Accelerator Facility (JLab). The azimuthal modulations of the double and single spin asymmetries have been measured in a wide kinematic range, providing access to transverse momentum distributions of partons. An extensive experimental program has been proposed for the upgraded JLab, which will allow precison studies of the transverse structure of the nucleon.

The QCD beta function extracted from polarized electron proton scattering data obtained at JLab and the lattice simulation in the MOM scheme suggest that the critical flavor number for the presence of IR fixed point is about three. In analyses of Schrodinger functional scheme, however, critical flavor number for the presence of IR fixed point and the conformality is larger than nine.In the QCD analysis, when quarks are expressed in quaternion basis, the product of quaternions are expressed by octonions and the octonion posesses the triality symmetry. Since the triality has the effect of multiplying the falvor number, it could explain the apparent large critical flavor number in the Schrodinger functinal scheme. In this scheme, larger degrees of freedom in adjusting data of different scales on the boundary are necessary than in the MOM scheme.In weak interaction, there is no clear lepton‐flavor violation except in the neutrino oscillation. If the triality is assigned to the lepton flavors(e,μ and τ) and th...

With an effective Lagrangian approach, we give a full analysis on the NN→NNππ and pp→pnπ+ reactions for proton beam energy from 1 to 1.5 GeV. The results are very consistent with the experiment data from CELSIUS, KEK, COSY, and so on. Based on these results, we consider the NN→NNππ and pp→pnπ+ for proton beam energy up to 4 GeV. Compare to the pp collisions, there are many benefits to study N* resonances in these two reactions. And for the high proton beam energy up to 15 GeV, we consider some new resonances with hidden charm which are definitely beyond three constituent quarks model in the pp→ppJ/ψ and pp→ppηc, where there are very nice places to find these new Ncc*. The predicted results about pp collisions can be looked for at the forthcoming PANDA/FAIR experiments.

The neutrino reactions on nucleon and nucleus play important role in core‐collapse supernova. Recently it is pointed that light nuclei(A = 2,3) can be abundant at the various stage of supernova environment. As an important mechanism of neutrino reaction on a few nucleon system, we study the neutrino emissivity on neutron fusion reaction nn→de−νe.

Diquark is employed to study the spectrum of baryons with one charm quark and two light quark within the mass loaded flux tube model. The spin‐orbit interaction is taken into account based on the heavy quark symmetry. Some observed Λc and Ξc baryons are systematically classified with suggested JP quantum numbers.

The correspondence between theories in anti-de Sitter space and field theories in physical space-time leads to an analytic, semiclassical model for strongly-coupled QCD which has scale invariance at short distances and color confinement at large distances. These equations, for both mesons and baryons, give a very good representation of the observed hadronic spectrum, including a zero mass pion. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. The meson and baryon wavefunctions derived from light-front holography and AdS/QCD also have remarkable phenomenological features, including predictions for the electromagnetic form factors and decay constants. The approach can be systematically improved using light-front Hamiltonian methods. Some novel features of QCD for baryon physics are also discussed., Presented by SJB at the International Conference on the Structure of Baryons, BARYONS'10, December 7-11, 2010, Osaka, Japan

Review of experimental observations which indicate the existence of a new narrow N*(1685) resonance is presented.

In this article, we review recent research activities on the structure and formation of the η mesic nuclei and the pionic atoms.

We report results for charmonium‐nucleon potential VccN(r) from lattice QCD, which is calculated from the equal‐time Bethe‐Salpeter amplitude through the effective Schrodinger equation. Detailed information of the low‐energy interaction between the charmonia (ηc and J/ψ) and the nucleon is indispensable for exploring the formation of charmonium bound to nuclei. Our simulations are carried out at a lattice cutoff of 1/a≈2 GeV in a spatial volume of (3fm)3 with the non‐perturbatively O(a)‐improved Wilson fermions for the light quarks and a relativistic heavy quark action for the charm quark. Although our main results are calculated in quenched lattice calculations, we also present preliminary full QCD results by using 2+1 flavor QCD configurations generated by the PACS‐CS Collaboration. We have found that the charmonium‐nucleon potential is weakly attractive at short distances and exponentially screened at large distances.

COSY, a storage and cooler synchrotron, which is fed by an injector cyclotron, is operated at Forschungszentrum Julich (Germany). It provides phase space cooled polarized or unpolarized beams of protons and deuterons with momenta between 0.3 and 3.7 GeV/c for internal experiments and to external target stations. The major experimental facilities, used for the ongoing physics program, are ANKE and WASA (internal) and TOF (external). A new internal target station to investigate polarization build‐up by spin‐filtering (PAX) has recently been commissioned. COSY is the machine for hadron spin physics on a world‐wide scale, which is also used for tests in conjunction with plans to build a dedicated storage ring for electric dipole moment (EDM) measurements of proton, deuteron and 3He. In this contribution recent results as well as future plans are summarized.

We evaluate interhadron interactions in quenched two‐color lattice QCD from Bethe‐Salpeter amplitudes, concentrating on S‐wave scattering states of two scalar diquarks (uCγ5d). Between two identical scalar diquarks, we observe repulsion in short‐range region. We define and evaluate the “quark‐exchange part” in the interaction, which is induced by adding quark‐exchange diagrams, or equivalently, by introducing Pauli blocking among some of quarks. The repulsive force in short‐distance region arises only from the “quark‐exchange part”, and disappears when quark‐exchange diagrams are omitted, which is qualitatively consistent with the constituent‐quark model picture that a color‐magnetic interaction among quarks is the origin of repulsion. We also find a universal long‐range attractive force, which enters in any flavor channels of two scalar diquarks and whose interaction range and strength are quark‐mass independent.

An extensive experimental program to measure the spin structure of the nucleon has been conducted in Hall B at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) in the last decade. Using a longitudinally polarized beam scattering off longitudinally polarized NH{sub 3} and ND{sub 3} targets, inclusive Deep Inelastic Scattering (DIS), Semi-Inclusive DIS (SIDIS) and DVCS experiments were carried out that make a significant contributions to the existing data. The inclusive double spin asymmetry A{sub ||} was measured over a large range in Q{sup 2} and W, providing data of impressively high precision that give a better understanding of the structure of the nucleon in the DIS and the valence quarks regions. Using parameterizations A2 and F1 from world data, the virtual photon asymmetry A1 and the structure function g1 were extracted in a Q{sup 2} range from 0.05 to 5 GeV{sup 2} and a W range from 1.08 to 3.0 GeV. As a result of the extended kinematical range, first moments of structure functions were measured over a large range in Q{sup 2} and duality was tested. Furthermore, newly proposed experiments, using an upgraded accelerator at Jefferson Laboratory and an improved CLAS detector (CLAS12), are expected to increasemore » the statistical precision of the current measurements and extend them to kinematic regions presently not accessible, such as high x. This will improve significantly our knowledge of the structure of the nucleon, including parton distribution functions, duality and higher twists contributions.« less

In hadron phenomenology, diquark structures can be an important degree of freedom in certain configurations. We investigate the possibility that the diquark structure can be treated as an elementary field in certain configurations. To start with, we assume that Λ is composed of a spectator strange quark and a diquark. We construct a QCD sum rule for Λ, where the input parameters are the diquark mass and its condensate, in addition to other parameters of QCD sum rules. We find good Borel curve for the Λ mass for certain combinations of the diquark mass and condensate, and that smaller diquark condensate is needed when the diquark mass is increased to maintain the good Borel curve. The same sets of diquark mass and condensate are found to work well for Λc and Λb.

J‐PARC was almost completed in early 2009 and started its operational era. Hadron Experimental Facility is one of the world‐wide research centers for nuclear and hadron physics. The present status of the beamline and spectrometers as well as the physics program for nuclear and hadron physics is described. New beamline and experiments there are also introduced.