J. Vijande, E. Weissman, A. Valcarce, and N. Barnea Departamento de Fı́sica Teórica e IFIC, Universidad de Valencia-CSIC, E-46100 Burjassot, Valencia, Spain The Racah Institute of Physics, The Hebrew University, 91904, Jerusalem, Israel Departamento de Fı́sica Fundamental, Universidad de Salamanca, E-37008 Salamanca, Spain Institute for Nuclear Theory, University of Washington, Seattle, Washingto...

Formation of η-mesic nucleus, a bound state of an η meson in a nucleus, is reviewed in this paper. Three different theoretical approaches are used to calculate the binding energies and widths of such nuclei. The effect of η-mesic nucleus in pion double-charge-exchange reaction is discussed. Experimental efforts by different groups to detect the nucleus are also discussed. The ramifications of t...

V. K. Magas,1 E. Oset,2 and A. Ramos1 1Departament d’Estructura i Constituents de la Matèria Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain 2Departamento de Fı́sica Teórica and IFIC Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna, Apdo. correos 22085, E-46071 Valencia, Spain (Received 29 January 2008; revised manuscript received 7 April 2008; pu...

We describe the behaviour at threshold of S-wave poles of the scattering matrix within a four-parameter model for non-exotic meson-meson scattering. This model accommodates all non-exotic mesons, hence also the light scalar mesons, as resonances and bound states characterised by complex singularities of the scattering amplitude as a function of the total invariant mass. The majority of the full...

The number of bound states of the one-dimensional Schrödinger equation is analyzed in terms of the number of bound states corresponding to ‘‘fragments’’ of the potential. When the potential is integrable and has a finite first moment, the sharp inequalities 12p1( j51 p N j<N<( j51 p N j are proved, where p is the number of fragments, N is the total number of bound states, and N j is the number ...

Quark-antiquark bound states are examined in the long-range strong-coupling limit with the minimal area law of lattice gauge theory assumed as input. Matrix element relations are established which in the eeective theory obtain dynamical equations equivalent to a formulation of the ux-tube model.

M-theory suggests the largeN limit of the matrix description of a collection of N Type IA D-particles should provide a nonperturbative formulation of heterotic string theory. In this paper states in the matrix theory corresponding to fundamental heterotic strings are identified, and their interactions are studied. Comments are made about analogous states in Type IIA string theory, which corresp...

We study the small oscillations regime (RPA approximation) of the time-dependent mean-field equations, obtained in a previous work [1], which describe the time evolution of one-body dynamical variables of a uniform Chiral Gross-Neveu system. In this approximation we obtain an analytical solution for the time evolution of the one-body dynam-ical variables. The two-fermion physics can be explored...

Fermilab experiment E791 studied weak decays of D + , D + s , and D 0 mesons produced in collisions of 500 GeV/c negative pions with Pt and C targets. The experiment collected over 200 000 fully reconstructed charm decays. Four recent results are discussed here: (a) measurement of the form factor ratios V /A 1 , A 2 /A 1 , and A 3 /A 1 in D + → K * 0 ℓ + ν ℓ and D + s → φ ℓ + ν ℓ decays; (b) me...