【正文】 to a simple toy model, we pare the holographic model with experimental data of mesons and deduce the parameters Tst , msep, a0(D) Fit of the first r trajectory Low mass trajectory High mass trajectory Low mass trajectory High mass trajectory Fit of the first b b trajectory Obviously the approximation of low mass trajectory yields a better fit for the r meson trajectories and the high mass has a lower c2 for the b bar b mesons. The best fit for all the light trajectories was found for the following parameters ( preleminry) msep~ GEV Tst ~ GEV2 a? ~ GEV2 For the b quark msep ~ 5 GEV Fit to the Regge trajectories of baryons What are the deviations of the full holographic model from the toy model? For mesons of not so large J and hence also L there are deviations from the |__| configuration . The ends of the string are charged under U(Nf) gauge interaction. For a single probe brane U(1) the constraint equation is modified and as a result we find that the constant term ( intercept) gets a shift. The charge is proportional to the string coupling which is a function of u0 and hence of the string endpoint mass! Combining the low spin spectra ( scalar and vector) from brane fluctuations with the high spin spectra from stringy configurations imposes a puzzle since the mass of the formers Mm~ 1/R while the tension of the string Tst ~(1/R)2 l Since for small curvature we need l 1, there is a large unacceptable gap between low and high spin mesons. This implies that will eventually have to work with curvature of order one. Holographic stringy Baryons How to identify a baryon in holography ? Since a quark corresponds to a string, the baryon has to be a structure with Nc strings connected to it. Witten proposed a baryonic vertex in AdS5xS5 in the form of a wrapped D5 brane over the S5. On the world volume of the wrapped D5 brane there is a CS term of the form The flux of the five form It implies that there is a charge Nc for the abelian gauge field. Since in a pact space one cannot have nonbalanced charges there must be N c strings attached to it. Strings end on the boundary external baryon / fflavor brane Strings end on a flavor brane dynamical baryons Possible experimental trace of the baryonic vertex? We have seen that the Nucleon states furnish a Regge trajectory. For Nc=3 a stringy baryon may be similar to the Y shape “old” stringy picture. The difference is the massive baryonic vertex. The effect of the baryonic vertex in a Y shape baryon on the Regge trajectory is very simple. It affects the Mass but since if it is in the center of the baryon it does not affect the angular momentum We thus get instead of J= a?mes M2 + a0 ? J= a?bar(Mmbv)2 +a0 and similarly for the improved trajectories with massive endpoints Comparison with data shows that the best fit is for mbv =0 and a?bar ~ a?mes Thus we are led to a picture where the baryon is a single string with a quark on one end and a diquark (+ a baryonic vertex) at the other end. This is in accordance with stability analysis which shows that a small instability in one arm will cause it to shrink so that the final state is a single string Stability analysis of classical stringy baryons ?t Hooft (Sharov) showed that the classical Y shape three string configuration is unstable We have examined Y shape strings with massive endpoints and with a massive baryonic vertex in the middle. The analysis included numerical simulations of the motions of