Search

The Joint Physics Analysis Center is a collaboration between theorists and experimentalists working in hadronic physics. In order to facilitate the exchange of information between the different actors in hadron spectroscopy, we have created an interactive website. In this note, I summarize the first projects available on the website. [ABSTRACT FROM AUTHOR]

The JLAB upgrade will soon be completed and the new CLAS12 detector system will collect large volumes of data allowing detailed investigations of many aspects of hadron physics. The focus of the MesonEx experiment is on the production of mesonic states by low Q2 virtual photons, or quasi-real photons. Studying such mesonic states is a particularly challenging data analysis problem, requiring well understood detector systems, clean signal and background separation, handling of large volumes of data and crucially a close collaboration between experimentalists and theorists to ensure the most sophisticated theoretical methods are used to interrogate the data. Here we briefly outline some of the analysis and methods that are being used to prepare for the MesonEx experiment. [ABSTRACT FROM AUTHOR]

We have investigated the decays of B¯0 → K¯*0R and B¯0s → ϕR with R being the X(4160), Y(3940), Z(3930) and a predicted J = 1 resonances. By using a model in which these states are dynamically generated from the vector-vector interaction, most notably the D* D¯* and D*s D¯*s states, we predicted five ratios for the production of these states. Some ratios show that the resonance is built from cc¯ with or without extra hadronization. In order to offer some extra test for the molecular composition of these states, we have evaluated the invariant mass distributions for the B¯0s → ϕD*D¯* and B¯0s → ϕD*s D¯*sclose to threshold and made predictions for these magnitudes relative to the width for the production of the resonances. [ABSTRACT FROM AUTHOR]

The Laura++ software package is designed for performing fits of amplitude models to data from decays of spin-0 particles into final states containing three spin-0 particles--so-called Dalitz-plot analysis. An overview of the amplitude formalism and its software implementation is given as well as summaries of recently added features and planned future developments. [ABSTRACT FROM AUTHOR]

Charm and charmonium physics have gained renewed interest in the past decade. Recent spectroscopic observations strongly motivate these studies. Among the several possible reactions, measurements in proton-antiproton annihilation play an important role, complementary to the studies performed at B-factories. The fixed target P¯ANDA experiment at FAIR (Darmstadt, Germany) will investigate fundamental questions of hadron and nuclear physics in the interactions of antiprotons with nucleons and nuclei. With reaction rates as large as 2×107 interactions/s, and a mass resolution 20 times better as compared with the most recent B-factories, P¯ANDA is in a privileged position to successfully perform the measurement of the width of narrow states, such as the X(3872). P¯ANDA will investigate also high spin particles, whose observation was forbidden at B-factories, i.e. F-wave charmonium states. In this report extrapolations on cross sections and rates with P¯ANDA are given. [ABSTRACT FROM AUTHOR]

A Generalized Screened Potential Model (GSPM) is applied to the study of charmonium. The model allows for a quite reasonable assignment of calculated J++ states, below and above thresholds, to all the PDG listed experimental candidates, including conventional as well as non conventional ones. Furthermore the model allows for the prediction of new non conventional J++ states. [ABSTRACT FROM AUTHOR]

We present preliminary results on the measurement of the I=1/2 Kπ S-wave through a model independent partial wave analysis of ηc decays to K0 S K+π- and K+K-π0 produced in two-photon interactions. We also perform a Dalitz plot analysis of the J/ψ decays to π+π-π0 and K+K-π0 produced in the initial state radiation process. [ABSTRACT FROM AUTHOR]

Based on 447.5 × 106 ψ(3686) produced at BESIII, we present results from an Amplitude Analysis of the ψ(3686) → γχc1; χc1 → ηπ+π- decays. Strong evidence for a two-body structure in ηπ+ + c.c. decays, with the invariant mass, width and spin consistent with the a2(1700) is found. This decay mode of the χc1 has not been reported before. Using a dispersion relation to model the a0(980) → ηπ line shape, a non-zero value for the a0(980) → η'π coupling is measured for the first time. The production of mesons with exotic quantum numbers, JPC = 1-+, decaying to the ηπ final state in the mass range 1.4-2.0 GeV/c2 is investigated, and the upper limits at 90% confidence level for the production of the π1(1400), π1(1600) and π1(2015) are determined. [ABSTRACT FROM AUTHOR]

The BESIII Experiment at the Beijing Electron Positron Collider has accumulated the world's largest samples of e+e- collisions in the tau-charm region. Many results in the light meson decays have been produced at BESIII based on large data sample of J/ψ. Recent results, including the observations of η(1405) → f0(980)π0, Y(2175) in J/ψ → ηφπ+π- decays and the hadronic and radiative decays of η/η' will be presented. [ABSTRACT FROM AUTHOR]

The Λ(1405) baryon is difficult to detect in experiment, absent in many quark model calculations, and supposedly manifested through a two-pole structure. Its uncommon properties made it subject to numerous experimental and theoretical studies in recent years. Finite-volume Lattice-QCD eigenvalues for different quark masses were recently reported by the Adelaide group. We compare these eigenvalues to predictions of a model based on Unitary Chiral Perturbation Theory (UCHPT). The UCHPT calculation predicts the quark mass dependence remarkably well. It also explains the overlap pattern with different meson-baryon components, mainly πΣ and K¯ N, at different quark masses. More accurate Lattice QCD data are required to draw definite conclusions on the nature of the Λ(1405). [ABSTRACT FROM AUTHOR]

In this talk we review the theoretical predictions for ratios of branching fractions of B¯0 decays into D0 and the scalar mesons f0(500), f0(980), a0(980), plus ¯ B0s decay into D0 and κ(800). We also compare the π+π- production in the scalar channel with that observed in the ρ channel and make predictions for the ¯ B0s decay into D0 and K*(892), comparing the strength of this channel with that of κ(800) production. The work is based on results of the chiral unitary approach where the scalar resonances are generated from the pseudoscalar-pseudoscalar interaction. Up to an arbitrary normalization, the mass distributions and rates for decays into the scalar resonances are predicted with no free parameters. [ABSTRACT FROM AUTHOR]

In this talk, the D0 weak decay into K0 s and a scalar resonance, f0(500), f0(980), a0(980), is presented. This decay allows us to produce the three resonances in the same decay in a process that is Cabibbo allowed, hence the rates obtained are large. There is no isospin conservation in the weak decays, hence it offers a unique opportunity to test the ideas of the chiral unitary approach where these resonances are produced from the interaction of pairs of pseudoscalar mesons. [ABSTRACT FROM AUTHOR]

Many new excited states of D mesons have been discovered in the last few years, bringing renewed interest to heavy meson spectroscopy. In a series of publications, the LHCb collaboration has studied the properties of the D meson excited states using decays of B mesons into a D meson plus light hadrons. These results are reviewed in this paper. [ABSTRACT FROM AUTHOR]

The first-time measurement of the angular dependence of the beam-helicity asymmetry for γp → pK+K- is shown and compared to γp → pπ+π-. The data obtained were from the CLAS g12 experiment at Je erson Lab. The experiment utilized a beam of circularly polarized photons with energies between 1.1 and 5.4 GeV incident on an unpolarized liquid hydrogen target. An unprecedented number of strange hadrons in photoproduction were observed in the g12 experiment. The production mechanism for strange hadrons is not well understood. The beam-helicity asymmetry is a polarization observable that provides information on competing production mechanisms in the reaction. It is shown that the asymmetry is sensitive to several kinematic variables that are key in modeling the reaction dynamics. Furthermore, the comparison of the beam-helicity asymmetry between the kaon and pion channels serves as a platform for the investigation of flavor dependence. [ABSTRACT FROM AUTHOR]

Employing a new class of string theories we construct a family of S -matrix amplitudes that factorize over linear Regge trajectories, and that are good candidates to be asymptotically free, i.e. to lead to asymptotically-free correlation functions working out the LS Z formulae the other way around. In particular, we propose a candidate for a string solution of QCD with NF massless quarks in the large-N 't Hooft limit, for the glueball and meson spectrum, and for certain S -matrix amplitudes in the collinear limit. The solution extends to massive quarks of equal mass. [ABSTRACT FROM AUTHOR]

In recent years, many studies of charmonium decays have been performed at BESIII based on large data samples of J / ψ(3686) andψ(3770). Recent results in searches for radiative transitions of ψ (3770) and rare phenomena in charmonium decays, and studies of light hadrons structures and properties will be presented. [ABSTRACT FROM AUTHOR]

The ±c meson has been studied by ATLAS experiment in several exclusive channels containing a J/ψ. ATLAS results on ±c spectroscopy obtained in LHC runs with the centre of mass beam energies 7 and 8 TeV are presented. The results include observation of the ±c(2S ) state and study of the decays±c → J/ψD±s. [ABSTRACT FROM AUTHOR]

COMPASS is a fixed-target experiment at the CERN SPS that studies the spectrum of light-quark hadrons. In 2009, it collected a large dataset using a 190 GeV/c positive hadron beam impinging on a liquid-hydrogen target in order to measure the central exclusive production of light scalar mesons. One of the goals is the search for so-called glueballs, which are hypothetical meson-like objects without valence-quark content. We study the decay of neutral resonances by selecting centrally produced pion pairs from the COMPASS dataset. The angular distributions of the two pseudoscalar mesons are decomposed in terms of partial waves, where particular attention is paid to the inherent mathematical ambiguities. The large dataset allows us to perform a detailed analysis in bins of the two squared four-momentum transfers carried by the exchange particles in the reaction. Possible parameterisations of the mass dependence of the partial-wave amplitudes in terms of resonances are also discussed. [ABSTRACT FROM AUTHOR]

In an e+e- B factory, charmonium states can be produced through di erent mechanisms, e.g. direct production in e+e- annihilation, double charmonium production, and in B-meson decays. Prompt production of J/ ψor ψ (2S ) in association with a second charmonium states has been observed by both the BABAR and the Belle experiments. These processes provide an opportunity to study both perturbative and non perturbative e ects in QCD and to search for new charmonium states recoiling against the reconstructed J/ ψor ψ (2S ). Using the full BABAR data set collected at the Υ(4S) resonance, we measure the absolute branching fractions of the two-body decays of B mesons (B → KXc), where Xc is a charmonium state. For events in which a B is fully reconstructed, the charmonium spectrum can be observed in an unbiased way by looking at the distribution of the K momentum in the rest frame of the recoiling B. We present also Dalitz plot analysis for the decays of B mesons to D-D0K+ and D¯-D0K+ , and we report about the observation of the D*s1(2700)+ resonance in these two channels, and obtain measurements of the mass and width. [ABSTRACT FROM AUTHOR]

In these proceedings some facts about resonances are discussed focusing on the analytic properties of resonant amplitudes with special emphasis on model independent analyses. As an illustrative example of the latter point the decays Bd/s→ J/ψ ππ are discussed in some detail. [ABSTRACT FROM AUTHOR]

The first-time measurement of the angular dependence of the beam-helicity asymmetry for γp → pK+K- is shown and compared to γp → pπ+π-. The data obtained were from the CLAS g12 experiment at Je erson Lab. The experiment utilized a beam of circularly polarized photons with energies between 1.1 and 5.4 GeV incident on an unpolarized liquid hydrogen target. An unprecedented number of strange hadrons in photoproduction were observed in the g12 experiment. The production mechanism for strange hadrons is not well understood. The beam-helicity asymmetry is a polarization observable that provides information on competing production mechanisms in the reaction. It is shown that the asymmetry is sensitive to several kinematic variables that are key in modeling the reaction dynamics. Furthermore, the comparison of the beam-helicity asymmetry between the kaon and pion channels serves as a platform for the investigation of flavor dependence. [ABSTRACT FROM AUTHOR]

We have calculated the mass spectra and digamma decay width of the dimesonic (meson-antimeson molecule) states in the heavy-light meson sector in the potential model framework. The interaction potential of the systems are assumed to be the Yukawa-like potential with the one pion exchange and sigma exchange potential. The calculated masss spectra of dimesonic states are in good agreement with compared states like Ds1(2536), DsJ *(2860) and DsJ(3040). [ABSTRACT FROM AUTHOR]

We use a symmetry-preserving regularization method of ultraviolet divergences in a vector-vector contact interaction model for low-energy QCD. The contact interaction is a representation of nonperturbative kernels used Dyson-Schwinger and Bethe-Salpeter equations. The regularization method is based on a subtraction scheme that avoids standard steps in the evaluation of divergent integrals that invariably lead to symmetry violation. Aiming at the study of heavy-light mesons, we have implemented the method to the pseudoscalar π and K mesons. We have solved the Dyson-Schwinger equation for the u,d and s quark propagators, and obtained the bound-state Bethe-Salpeter amplitudes in a way that theWard-Green-Takahashi identities reflecting global symmetries of the model are satisfied for arbitrary routing of the momenta running in loop integrals. [ABSTRACT FROM AUTHOR]

Within the realm of QCD sum rules, one of the most important areas of application of this nonperturbative approach is the prediction of the decay constants of heavy mesons. However, in spite of the fact that, indisputably, the adopted techniques are, of course, very similar, we encounter rather dissimilar challenges, or obstacles, when extracting from two-point correlators of appropriate heavy-light currents interpolating the mesons, the characteristics of charmed mesons with different spin. In view of this, it seems worthwhile to us to revisit this issue for the case of charmed pseudoscalar mesons D(s) and vector mesons D*(s). [ABSTRACT FROM AUTHOR]

The problem of self-consistent estimates of the deconfinement temperature Tc in the framework of the bottomup holographic approach to QCD is observed. It is shown that the standard soft wall model gives Tc around 260 MeV for planar gluodynamics in a good agreement with the lattice data. The extensions of soft wall model adjusted for descriptions of realistic meson spectra result in a broad range of predictions. This variability is related to a poor experimental information on the radially excited mesons. [ABSTRACT FROM AUTHOR]

We present new results on the decay patterns of scalar and tensor glueballs in the top-down holographic Witten- Sakai-Sugimoto model. This model, which has only one free dimensionless parameter, gives semi-quantitative predictions for the vector meson spectrum, their decay widths, and also a gluon condensate in agreement with SVZ sum rules. The holographic predictions for scalar glueball decay rates are compared with experimental data for the widely discussed gluon candidates f0(1500) and f0(1710). [ABSTRACT FROM AUTHOR]

I report on progress by the HPQCD Collaboration using radiatively-improved lattice NonRelativistic QCD and relativistic HISQ valence quarks on ensembles of gluon field configurations, generated by the MILC collaboration that now include u, d, s and c HISQ quarks in the sea, with the u/d quark masses going down to their physical value. I describe the background field approach for determining the one-loop radiative improvement to coefficients in the NRQCD action, and I present the most accurate results yet for a range of quantities, including: the hyperfine splittings Mr -Mηb and MB*q -MBq ; fB, fBs and the leptonic decay constants fr(i); B-meson masses mBq for q = u/d, s, c; B - B mixing; the b-quark mass mb; and the lattice calculation for the rare decays B0 → K*0μ+μ- and Bs →ϕμ+μ-. I briefly discuss future prospects. [ABSTRACT FROM AUTHOR]

We present a calculation of the Hadron spectrum in the Dyson-Schwinger/Bethe-Salpeter approach to continuum QCD. A sophisticated truncation featuring all covariant structures of the quark-gluon vertex, with its inherent flavour dependence, is employed in a framework that preserves the dynamics of chiral symmetry breaking. The study is suggestive as to the relevance of additional resonant and non-resonant two- and three-body contributions. [ABSTRACT FROM AUTHOR]

Our results on obtaining the Regge trajectory of a resonance from its pole in a scattering process and from analytic constraints in the complex angular momentum plane are presented. The method, suited for resonances that dominate an elastic scattering amplitude, has been applied to the ρ(770), f2(1270), f2(1525) and f0(500) resonances. Whereas for the first three we obtain linear Regge trajectories, characteristic of ordinary quark-antiquark states, for the latter we find a nonlinear trajectory with a much smaller slope at the resonance mass. We also show that if a linear trajectory with a slope of typical size is imposed for the f0(500), the corresponding amplitude is at odds with the data. This provides a strong indication of the non-ordinary nature of the sigma meson. [ABSTRACT FROM AUTHOR]

The spectrum of excited hadrons - mesons and baryons - serves as an excellent probe of quantum chromodynamics (QCD), the fundamental theory of the strong interaction. The strong coupling however makes QCD challenging. It confines quarks and breaks chiral symmetry, thus providing us with the world of light hadrons. Highly-excited hadronic states are sensitive to the details of quark confinement, which is only poorly understood within QCD. This is the regime of nonperturbative QCD and it is one of the key issues in hadronic physics to identify the corresponding internal degrees of freedom and how they relate to strong coupling QCD. The quark model suggests mesons are made of a constituent quark and an antiquark and baryons consist of three such quarks. QCD predicts other forms of matter. What is the role of glue? Resonances with large gluonic components are predicted as bound states by QCD. The lightest hybrid mesons with exotic quantum numbers are estimated to have masses in the range from 1 to 2 GeV/c2 and are well in reach of current experimental programs. At Jefferson Laboratory (JLab) and other facilities worldwide, the high-energy electron and photon beams present a remarkably clean probe of hadronic matter, providing an excellent microscope for examining atomic nuclei and the strong nuclear force. [ABSTRACT FROM AUTHOR]

We present new results on the decay patterns of scalar and tensor glueballs in the top-down holographic Witten-Sakai-Sugimoto model. This model, which has only one free dimensionless parameter, gives semi-quantitative predictions for the vector meson spectrum, their decay widths, and also a gluon condensate in agreement with SVZ sum rules. The holographic predictions for scalar glueball decay rates are compared with experimental data for the widely discussed gluon candidates f0(1500) and f0(1710). [ABSTRACT FROM AUTHOR]

Investigation of the thermal properties of the mesons with higher spin is one of the important problems in the hadron physics. At finite temperature, the Lorentz invariance is broken by the choice of a preferred frame of reference and some new operators appear in the Wilson expansion. Taking into account these additional operators, we calculate the thermal two-point correlation function for D2* (2460) and Ds2*(2573) tensor mesons. In order to perform the numerical analysis, we use the fermionic part of the energy density obtained both from lattice QCD and Chiral perturbation theory. We also use the temperature dependent continuum threshold and show that the values of the decay constants decrease considerably near to the critical temperature compared to their values in the vacuum. Our results at zero temperature are in good consistency with predictions of other nonperturbative models. [ABSTRACT FROM AUTHOR]

We study the inclusive hadroproduction of D0, D+, D*+, and Ds+ mesons at leading order in the parton Reggeization approach endowed with universal fragmentation functions fitted to e+e- annihilation data from CERN LEP1. We have described D-meson transverse momentum distributions measured in the central region of rapidity by the CDF Collaboration at Tevatron (|y| < 1) and ALICE Collaboration at the LHC (|y| < 0.5) within uncertainties and without free parameters, using Kimber-Martin-Ryskin approach to obtain unintegrated gluon distribution function in a proton. [ABSTRACT FROM AUTHOR]

I report on progress by the HPQCD Collaboration using radiatively-improved lattice NonRelativistic QCD and relativistic HISQ valence quarks on ensembles of gluon field configurations, generated by the MILC collaboration that now include u, d, s and c HISQ quarks in the sea, with the u/d quark masses going down to their physical value. I describe the background field approach for determining the one-loop radiative improvement to coefficients in the NRQCD action, and I present the most accurate results yet for a range of quantities, including: the hyperfine splittings Mϒ -Mηb and MB*q - MBq; fB, fBs and the leptonic decay constants fϒ('); B-meson masses mBq for q = u/d, s, c; B-B mixing; the b-quark mass mb; and the lattice calculation for the rare decays B0 →K*0µ+µ- and Bs →φµ+µ-. I briefly discuss future prospects. [ABSTRACT FROM AUTHOR]

If the X(3872), Y(3940) and X(4160) are D¯D +c:c:, D¯D and Ds ¯D s molecules, respectively, there should be doubly charmed mesons (D()D()). In this talk we predict two states with JP = 1+ in the charm = 2 sector, one DD state around 3850 MeV, other DD state with mass around 3970 MeV, and other two similar states in the (charm=2; strangeness= 1) sector. Besides that, we evaluate the decay widths of doubly charm mesons DD(1+), into DDp and DDg. These decays are mediated by anomalous couplings DD ??DD, with the subsequent decay of D into Dp or Dg. [ABSTRACT FROM AUTHOR]

We present a calculation of the Hadron spectrum in the Dyson-Schwinger/Bethe-Salpeter approach to continuum QCD. A sophisticated truncation featuring all covariant structures of the quark-gluon vertex, with its inherent flavour dependence, is employed in a framework that preserves the dynamics of chiral symmetry breaking. The study is suggestive as to the relevance of additional resonant and non-resonant two- and three-body contributions. [ABSTRACT FROM AUTHOR]

Our results on obtaining the Regge trajectory of a resonance from its pole in a scattering process and from analytic constraints in the complex angular momentum plane are presented. The method, suited for resonances that dominate an elastic scattering amplitude, has been applied to the p(770), f2(1270), f0(1525) and fo(500) resonances. Whereas for the first three we obtain linear Regge trajectories, characteristic of ordinary quark-antiquark states, for the latter we find a nonlinear trajectory with a much smaller slope at the resonance mass. We also show that if a linear trajectory with a slope of typical size is imposed for the fo(500), the corresponding amplitude is at odds with the data. This provides a strong indication of the non-ordinary nature of the sigma meson. [ABSTRACT FROM AUTHOR]

This talk includes a short introduction to Chiral Perturbation Theory in the meson sector concentrating on a number of recent developments. I discuss the latest fit of the low-energy constants. Finite volume corrections are discussed for the case with twisted boundary conditions for form-factors and first results at two-loops for three flavours for masses. The last part discusses the extension to other symmetry breaking patterns relevant for technicolour and related theories as well as the calculation of leading logarithms to high loop orders. [ABSTRACT FROM AUTHOR]

The spectrum of excited hadrons - mesons and baryons - serves as an excellent probe of quantum chromodynamics (QCD), the fundamental theory of the strong interaction. The strong coupling however makes QCD challenging. It confines quarks and breaks chiral symmetry, thus providing us with the world of light hadrons. Highly-excited hadronic states are sensitive to the details of quark confinement, which is only poorly understood within QCD. This is the regime of nonperturbative QCD and it is one of the key issues in hadronic physics to identify the corresponding internal degrees of freedom and how they relate to strong coupling QCD. The quark model suggests mesons are made of a constituent quark and an antiquark and baryons consist of three such quarks. QCD predicts other forms of matter. What is the role of glue? Resonances with large gluonic components are predicted as bound states by QCD. The lightest hybrid mesons with exotic quantum numbers are estimated to have masses in the range from 1 to 2 GeV/c² and are well in reach of current experimental programs. At Jefferson Laboratory (JLab) and other facilities worldwide, the high-energy electron and photon beams present a remarkably clean probe of hadronic matter, providing an excellent microscope for examining atomic nuclei and the strong nuclear force. [ABSTRACT FROM AUTHOR]

Spin-isospin response in exotic nuclear systems is investigated. It is found that in some nuclei excitations with pionic quantum numbers (0-, 1+, 2-, ...) appear at very low energies with large transition probabilities, which is an indication of the vicinity of the onset of pion condensation. As an example, 2- components of the spin-dipole resonance in 78Ni and 132Sn are considered. The existence of such modes points out to the necessity of taking into account their coupling to other elementary modes of excitation, e.g. single-quasiparticle ones. This coupling is introduced in the theory for the first time. Thereby, both rho-meson and pion-exchange contributions to the nucleon-nucleon interaction are included in the relativistic framework beyond the Hartree-Fock approximation. Namely, classes of Feynman diagrams are selected according to their significance for nuclear spectroscopic characteristics, such as single-particle energies and strength functions, and included into the nucleonic self-energy in all orders of meson-exchange. As an illustration, the impact of these new contributions on the single-particle energies of 100Sn is discussed. [ABSTRACT FROM AUTHOR]

We report on our recent study of the the neutrino-nucleon reaction in the nucleon resonance region. The dynamical reaction model of meson production reaction on the nucleon for the pion and photon induced reaction has been developed in order to investigate the spectrum of nucleon excited state. We have extended this model in order to describe the weak meson production reactions with the πN,ηN,KΛ,KΣ and ππN final states. We also studied the role of the final state interaction in the photon and the neutrino induced pion production reaction on the deuteron around the ?(1232) resonance region. [ABSTRACT FROM AUTHOR]

The strange particle production induced by (anti)neutrino off nucleon has been studied for |ΔS| = 0 and |ΔS| = 1 channels. The reactions those we have considered are for the production of single kaon/antikaon, eta and associated particle production processes. We have developed a microscopical model based on the SU(3) chiral Lagrangian. The basic parameters of the model are fπ, the pion decay constant, Cabibbo angle, the proton and neutron magnetic moments and the axial vector coupling constants for the baryons octet. For antikaon production we have also included S*(1385) resonance and for eta production S11(1535) and S11(1650) resonances are included. [ABSTRACT FROM AUTHOR]

We study forward neutrino-induced meson production off the nucleon in the resonance region. Our calculation is based on a dynamical coupled-channels (DCC) model that reasonably describes π(γ)N → πN, ηN, KΛ, KΣ data in the resonance region. We apply the PCAC hypothesis to the DCC model to relate the πN reaction amplitude to the forward neutrino reaction amplitude. In this way, we give a prediction for νN → πN, ππ N, ηN, KΛ, KΣ reaction cross sections. The predicted νN → ππN, ηN, KΛ, KΣ cross sections are, for the first time, based on a model extensively tested by data. We compare our results with those from the Rein-Sehgal model that has been very often used in the existing Monte Carlo simulators for neutrino experiments. We find a significant difference between them. [ABSTRACT FROM AUTHOR]

Understanding of the so-called 2 particle-2 hole (2p-2h) effect is an urgent program in neutrino interaction physics for current and future oscillation experiments. Such processes are believed to be responsible for the event excesses observed by recent neutrino experiments. The 2p-2h effect is dominated by the meson exchange current (MEC), and is accompanied by a 2-nucleon emission from the primary vertex, instead of a single nucleon emission from the charged-current quasi-elastic (CCQE) interaction. Current and future high resolution experiments can potentially nail down this effect. For this reason, there are world wide efforts to model and implement this process in neutrino interaction simulations. In these proceedings, I would like to describe how this channel is modeled in neutrino interaction generators. [ABSTRACT FROM AUTHOR]

The exclusive photoproduction of Ѱ(2S) meson was investigated and the coherent and the incoherent contributions were evaluated. The light-cone dipole formalism was considered in this analysis and predictions are done for PbPb collisions at the CERN-LHC energy of 2.76 TeV. A comparison is done to the recent ALICE Collaboration data for the Ѱ(1S) state photoproduction with good agreement. [ABSTRACT FROM AUTHOR]

We report on some new theoretical results for the representation of generalized parton distributions (GPDs), the understanding of next-to-leading order corrections to hard exclusive processes, the calculation of higher twist corrections to deeply virtual Compton scattering, and the progress in describing experimental measurements in terms of GPD models. [ABSTRACT FROM AUTHOR]

The Bose-Einstein correlation is the phenomenon in which protons and antiprotons collide at extremely high energies; coalesce one into the other resulting into the fireball of finite dimension. They annihilate each other and produces large number of mesons that remain correlated at distances very large compared to the size of the fireball. It was believed that Einstein's special relativity and relativistic quantum mechanics are the valid frameworks to represent this phenomenon. Although, these frameworks are incomplete and require arbitrary parameters (chaoticity) to fit the experimental data which are prohibited by the basic axioms of relativistic quantum mechanics, such as that for the vacuum expectation values. Moreover, correlated mesons can not be treated as a finite set of isolated point-like particles because it is non-local event due to overlapping of wavepackets. Therefore, the Bose-Einstein correlation is incompatible with the axiom of expectation values of quantum mechanics. In contrary, relativistic hadronic mechanics constructed by Santilli allows an exact representation of the experimental data of the Bose-Einstein correlation and restore the validity of the Lorentz and Poincare symmetries under nonlocal and non-Hamiltonian internal effects. Further, F. Cardone and R. Mignani observed that the Bose-Einstein two-point correlation function derived by Santilli is perfectly matched with experimental data at high energy [ABSTRACT FROM AUTHOR]

I discuss the use of light as a collection of real and virtual photons to study some lingering questions in particle and nuclear physics. [ABSTRACT FROM AUTHOR]

In this work in contrast to the usual Walecka model [1] we include the interaction between the σ - ω mesons [2,3] with the aim of studying the nuclear matter properties in the relativistic mean-field theory in the regime of high temperatures. Therefore in our work we use the non-linear Walecka model. We investigate whether the phase transition characteristic of other models without these interactions vanishes for a given value of chemical potential μ and baryon density pN. [ABSTRACT FROM AUTHOR]