Search for Standard Higgs Boson at Supercolliders

We review the standard Higgs boson physics and the search for higgs boson at LEP and LHC supercollidersComment: latex, 70 pages, 15 ps.figure

Pentaquarks and strange tetraquark mesons

We consider the interplay of the pentaquark states and strange tetraquark states in the decay $\Lambda^0_b\to K^-J/\psi p$. Possible existence of ($cs\bar c\bar u$)-states is taken up and their manifestation in the $K^-J/\psi$-channel is discussed. It is emphasised that these exotic mesons can imitate broad bumps in the in the $pJ/\psi$-channel.Comment: 4 pages and 1 figur

Central production of lepton-antilepton pairs and heavy quark composite states in hadron diffractive collisions at ultrahigh energies

Central production of lepton-lepton pairs ($e^+e^-$ and $\mu^+\mu^-$) and heavy quark composite states (charmonia and bottomonia) in diffractive proton collisions (proton momenta transferred ${|\bf q_\perp}|\sim m/\ln s$) are studied at ultrahigh energies ($\ln{s}>>1$), where $\sigma_{tot}(pp^\pm)\sim\ln^N s$ with 1\la N\la 2. The $pp^\pm$-rescattering corrections, which are not small, are calculated in terms of the $K$-matrix approach modified for ultrahigh energies. Two versions of hadron interactions are considered in detail: the growth (i) $\sigma_{tot}(pp^\pm)\sim\ln^2 s$, $\sigma_{inel}(pp^\pm)\sim\ln^2 s$ within the black disk mode and (ii) $\sigma_{tot}(pp^\pm)\sim\ln^2 s$, $\sigma_{inel}(pp^\pm)\sim\ln s$ within the resonant disk mode. The energy behavior of the diffractive production processes differs strongly for these modes, thus giving a possibility to distinguish between the versions of the ultrahigh energy interactions.Comment: 10 pages. arXiv admin note: substantial text overlap with arXiv:1408.069

Scaling Violation and Gauge/String Duality

We explore the possibilities for scaling violation in gauge theories that have string duals. Like in perturbative QCD, short-distance behaviour yields logarithms that violate the scaling.Comment: 11 pages, 4 figures; v3: typos corrected, minor changes, to appear in PR