We study tt̄ production in R-parity violating supersymmetry. The annihilation channel qq̄ → tt̄ gets new contributions from t-channel exchange of squarks or sleptons. With the data from Tevatron on tt̄ production, we find that the squarkor slepton-exchange processes constrain the B-violating λ couplings or the L-violating λ couplings, respectively. Our bounds are already comparable to the few exist...

We describe the implementation of supersymmetric processes in the HERWIG Monte Carlo event generator. We define relevant parameter and mixing conventions and list the hard scattering matrix elements. Our implementation is based on the Minimum Supersymmetric Standard Model, with the option of R-parity violation. The sparticle spectrum is completely general. Both hadron–hadron and lepton–lepton c...

Experimental collaborations for the large hadron collider conducted various searches supersymmetry. In absence of signals, lower limits were put on sparticle masses but usually within frameworks with (over-)simplifications relative to entire indications by supersymmetry models. For complementing current interpretations experimental bounds, we introduce a 30-parameter version R-parity conserving...

We aim to construct quark hadron physics based on QCD. First, using lattice QCD, we study mass spectra of positive-parity and negative-parity baryons in the octet, the decuplet and the singlet representations of the SU(3) flavor. In particular, we consider the lightest negative-parity baryon, the Λ(1405), which can be an exotic hadron as theNK̄ molecular state or the flavor-singlet three-quark s...

If a light gluino, with a mass of the order of GeV, exists in the minimal supersymmetric extension of the Standard Model, then it can contribute to the production rate of the top quark pairs at hadron colliders via g̃g̃ → tt̄. Because the top quark is heavy, the masses of the superpartners of the lefthanded and right-handed top quarks can be very different such that a parityviolating observable ca...

We study the colour connection structure of R-parity violating decays and production cross sections, and construct a Monte Carlo simulation of these processes including colour coherence effects. We then present some results from the implementation of these processes in the HERWIG Monte Carlo event generator. We include the matrix elements for the two-body sfermion and three-body gaugino and glu...

The generalized Weinberg sum rules containing the difference of isovector vector and axial-vector spectral functions saturated by both finite and infinite number of narrow resonances are considered. We summarize the status of these sum rules and analyze their overall agreement with phenomenological Lagrangians, low-energy relations, parity doubling, hadron string models, and experimental data.

The generalized Weinberg sum rules containing the difference of isovector vector and axial-vector spectral functions saturated by both finite and infinite number of narrow resonances are considered. We give a historical survey and summarize the status of these sum rules analyzing their overall agreement with phenomenological Lagrangians, lowenergy relations, parity doubling, hadron string model...