We propose a model of weak interactions in which the currents are constructed out four basic quark fields and interact with charged massive vector boson. show, to all orders perturbation theory, that leading divergences do not violate any strong-interaction symmetry next respect observed weak-interaction selection rules. The features remarkable between leptons quarks. extension our complete Yang-Mills theory is discussed.

Heavy-light diquarks can be the building blocks of a rich spectrum states which accommodate some newly observed charmoniumlike resonances not fitting pure $c\overline{c}$ assignment. We examine this possibility for hidden and open charm diquark-antidiquark deducing spectra from constituent quark masses spin-spin interactions. Taking $X(3872)$ as input we predict existence ${2}^{++}$ state that associated to $X(3940)$ by Belle reexamine claimed SELEX, $X(2632)$. The possible assignment...

Following the recent confirmation of Z+(4430) resonance with J^{PG}=1^{++}, we have re-examined model S- and P-wave tetraquarks. We propose a `type-II' diquark-antidiquark which shows to be very effective at producing simple comprehensive picture J^{PG}=1^{++} 1^{--} sectors recently discovered charged tetraquarks observed Y resonances. The is still faced unresolved difficulty explaining why some states seem incomplete isospin multiplets.

Pentaquark baryons are a natural expectation of an extended picture hadrons where quarks and diquarks the fundamental units. The parity/mass pattern observed, when compared to that exotic mesons, appears as footprint compact five-quark structure. What has been learned from X,Y,Z phenomenology informs about newly found pentaquark structure suggests further experimental tests directions be explored.

Light scalar mesons are found to fit rather well a diquark-antidiquark description. The resulting nonet obeys mass formulas which respect, good extent, the Okubo-Zweig-Iizuka (OZI) rule. OZI allowed strong decays reasonably reproduced by single amplitude describing switch of qq pair, transforms state into two colorless pseudoscalar mesons. Predicted heavy states with one or more quarks replaced charm beauty briefly described; they should give rise narrow exotic quantum numbers.

We propose that the $Y(4260)$ particle recently announced by BABAR is first orbital excitation of a diquark-antidiquark state $([cs][\overline{c}\overline{s}])$. Using parameters determined to describe $X(3872)$ and $X(3940)$ we show $Y$ mass compatible with picture. A crucial prediction should decay predominantly in ${D}_{s}{\overline{D}}_{s}$. The also be seen $B$ nonleptonic decays association one kaon. consider full nonet related four-quark states their predicted properties. Finally,...

In the context of Minimal Supersymmetric extension Standard Model (MSSM), we reanalyze search for heavier CP-even H and CP-odd A neutral Higgs bosons at LHC in their production gluon-fusion mechanism decays into gauge lighter h top quark pairs. We show that only when considering these processes, one can fully cover entire parameter space sector model. Indeed, they are sensitive to low tan β high mass ranges, complementing traditional searches resonances decaying τ -lepton pairs which instead...

New BES and Belle data show a peak in the $Y(4260)$ decay into $J/\ensuremath{\psi}$ plus one charged pion. We point out that might correspond to resonance at about 3880 MeV predicted some time ago within tetraquark model. The same model predicts another 100 below observed one. discuss possibility of having it present data. On other hand we expect if molecular picture were correct one, corresponding ${D}^{*}{\overline{D}}^{*}$ state should appear 4020 MeV.

We analyze the Minimal Supersymmetric extension of Standard Model that we have after discovery Higgs boson at LHC, hMSSM (habemus MSSM?), i.e. a model in which lighter $h$ has mass approximately 125 GeV which, together with non-observation superparticles indicates SUSY-breaking scale $M_S$ is rather high, $M_S > 1$ TeV. first demonstrate value $M_h \approx 125$ fixes dominant radiative corrections enter MSSM masses, leading to sector can be described, good approximation, by only two free...