The physics related to the form factors of energy momentum tensor spans a wide spectrum problems, and includes gravitational physics, hard exclusive reactions, hadronic decays heavy quarkonia, exotic hadrons described as hadroquarkonia. It also provides access "last global unknown property:" D-term. We review associated with energy-momentum D-term, their interpretations in terms mechanical properties, applications, current experimental status.

We argue that generalized parton distributions (GPDs), accessible in hard exclusive processes, carry information about the spatial distribution of forces experienced by quarks and gluons inside hadrons. This way measurements processes open a possibility for direct "measurements" strong different parts nucleons nuclei. Also such studies venue addressing questions properties quark (gluon) matter hadrons give simple example relations between GPDs "nuclear matter" finite

We study the off-forward quark distributions (OFQD's) in chiral quark-soliton model of nucleon. This is based on large-N_c picture nucleon as a soliton effective lagrangian and allows to calculate leading twist quark- antiquark at low normalization point. demonstrate consistency approach by checking various sum rules for OFQD's. present numerical estimates isosinglet distribution H(x,\xi,\Delta^2). In contrast other approaches we find strong qualitative dependence longitudinal momentum...

The isosinglet unpolarized and isovector polarized twist-2 quark distributions of the nucleon at low normalization point are calculated in large-${N}_{c}$ limit. is described as a soliton effective chiral theory. We derive expressions for distribution functions limit starting from their definition numbers partons carrying momentum fraction $x$ infinite frame. develop numerical method computation antiquark sums over single-particle levels pion field soliton. contributions discrete bound-state...

The nucleon form factors of the energy-momentum tensor are studied in large-Nc limit framework chiral quark-soliton model.2 MoreReceived 27 February 2007DOI:https://doi.org/10.1103/PhysRevD.75.094021©2007 American Physical Society

We present a dispersive representation of the D-term form factor for hard exclusive reactions, using unsubtracted t-channel dispersion relations. The unitarity relation is saturated with contribution two-pion intermediate states, distributions amplitude γ⁎γ→ππ subprocess and reconstructing ππ→NN¯ from available information on pion-nucleon partial-wave helicity amplitudes. Results as function t well at t=0 are discussed in comparison model predictions phenomenological parametrizations.

We interpret the newly discovered pentaquark $P_c(4450)$ as a bound state of charmonium $\psi(2S)$ and nucleon. The binding potential is due to charmonium-nucleon interaction that in heavy quark approximation proportional product chromoelectric polarizability nucleon energy-momentum distribution. use large $N_c$ expansion estimate quarkonium calculate properties framework mean-field picture light baryons. Two almost degenerate states $J^P=(1/2)^-$ $J^P=(3/2)^-$ are predicted at position...

The pentaquark $P_c^+(4450)$ recently discovered by LHCb has been interpreted as a bound state of $\Psi(2S)$ and nucleon. charmonium-nucleon interaction which provides the binding mechanism is given, in heavy quark limit, terms charmonium chromoelectric polarizabilities densities nucleon energy-momentum tensor (EMT). In this work we show model-independent way, exploring general properties effective interaction, that can form states with $\Delta$. Using Skyrme model to evaluate large-$N_c$...

We employ the chiral quark-soliton model to describe excited baryons with one heavy quark. Identifying known charmed multiplets allowed by model, we argue that apart from regular excitations of ground-state multiplets, two out five narrow ${\mathrm{\ensuremath{\Omega}}}_{c}^{0}$ states, recently reported LHCb Collaboration, may correspond exotic pentaquarks. This interpretation can be easily verified experimentally, since states---contrary excitations---form isospin triplets rather than singlets.

The leading-twist wave functions of the pion and photon at a low normalization point are calculated in effective low--energy theory derived from instanton vacuum. function is found to be close asymptotic one, consistent with recent CLEO measurements. non-zero endpoints. This different behavior consequence momentum dependence dynamical quark mass suggested by We comment on relation meson off-forward parton distributions this model.

We review the technique of heavy quark mass expansion various operators made fields using a semiclassical approximation. It corresponds to an operator product in form series inverse mass. This applied recently axial vector current is used estimate charm content $\ensuremath{\eta},$ ${\ensuremath{\eta}}^{\ensuremath{'}}$ mesons and intrinsic contribution proton spin. The derivation for $〈\overline{Q}{\ensuremath{\gamma}}_{5}Q〉$ given here detail expansions scalar, tensor...

The amplitude for hard exclusive pseudoscalar meson electroproduction off nucleon (nuclear) targets is computed in QCD within the leading ${\ensuremath{\alpha}}_{s}\mathrm{ln}{Q}^{2}/{\ensuremath{\Lambda}}_{\mathrm{QCD}}^{2}$ approximation. We show that distribution of recoil nucleons depends strongly on angle between momentum and polarization vector target (or outgoing nucleon). This dependence especially sensitive to spin flip skewed parton (SPD) $\stackrel{\ifmmode \tilde{}\else...

Given presently known empirical information about the exotic Theta+ baryon, we analyze possible properties of its SU(3)F partners, paying special attention to nonstrange member antidecuplet N*. The modified PWA analysis presents two candidate masses, 1680 MeV and 1730 MeV. In both cases N* should be highly inelastic. theoretical analysis, based on soliton picture assumption Gamma(Theta+) < 5 MeV, shows that most probably Gamma(N*) 30 Similar for Xi3/2 predicts width not more than 10 Our...

A bstract Using the instanton picture of QCD vacuum we compute nucleon $$ {\overline{c}}^Q(t) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>c</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>Q</mml:mi> </mml:msup> <mml:mfenced> <mml:mi>t</mml:mi> </mml:mfenced> </mml:math> form factor quark part energy momentum tensor (EMT). This describes non-conservation EMT and contributes to pressure distribution inside nucleon. Also it can be interpreted in...

New LHCb Collaboration results on pentaquarks with hidden charm 1 are discussed. These fit nicely in the hadrocharmonium pentaquark scenario.[Formula: see text] In new data old [Formula: splits into two states and text]. We interpret these almost degenerated text], as a result of hyperfine splitting between predicted Ref. 2. It arises due to QCD multipole interaction color-singlet constituents. improve theoretical estimate splitting[Formula: that is compatible experimental data. The state...

We derive simple relations which express 2D light front force distributions in terms of 3D Breit frame pressure and shear distributions. Mathematically the correspond to invertible Abel transformation they establish one-to-one mathematical equivalence ones. Any knowledge (model calculation, experimental measurement, etc.) about can be unambiguously transformed into with help transformation. It is important that ensures stability conditions if are satisfied. As an illustration how work, we...

We estimate the size of twist-3 effects on deeply virtual Compton scattering (DVCS) observables, in Wandzura-Wilczek approximation. present results valence region for DVCS cross sections, charge asymmetries, and single spin to accuracy.

We compute the helicity skewed quark distributions $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{H}$ and \~{}\fi{}}{E}$ in chiral quark-soliton model of nucleon. This emphasizes correctly role spontaneously broken symmetry structure It is based on large-${N}_{c}$ picture nucleon as a soliton effective Lagrangian allows us to calculate leading twist antiquark at low normalization point. discuss \~{}\fi{}}{E}.$ show that generalization soft pion theorems, Ward identities, leads region...