The search for the next Standard Model of fundamental interactions is being carried out at two frontiers: the high energy frontier involving the Tevatron and Large Hadron Collider, and the high precision frontier where the focus is largely on low energy experiments. I discuss the unique and powerful window on new physics provided by the precision frontier and its complementarity to the informat...

Simulation of gamma and hadron showers in the energy range 100GeV- 25TeV has been carried out. For a big ideal Cherenkov light array, characteristics of lateral distribution of Cherenkov photon density have been studied. Results from this ideal detector are compared with those simulated for a real TUNKA- like array to investigate experimental potential of using existence of a hump in lateral di...

The RHIC data on charm production are compared with the kT -factorization approach predictions, both standard NLO QCD and FONLL. The calculated results underestimate the STAR Collaboration data. The role of possible nuclear effects is discussed. PACS numbers: 25.75.Dw, 13.87.Ce, 24.85.+p The investigation of heavy quark production in high energy collisions is an important method for studing the...

Electron-hadron colliders are the ultimate tool for high-precision quantum chromodynamics studies and provide microscope probing internal structure of hadrons. The electron is an ideal probe proton because it provides unmatched precision electromagnetic interaction, as virtual photon or vector bosons in a clean environment, kinematics which uniquely determined by beam scattered lepton, hadronic...

At the LHC, superpartners with the masses lighter than a few TeV may be found, and the masses of the supersymmetric (SUSY) particles and their interactions will be studied. The information will be the base to consider the SUSY breaking mechanism and cosmology related to the SUSY dark matter. We review the recent studies that aims for the “precise SUSY study” at the LHC.

The question of whether neutrino masses are Dirac or Majorana is one of the most important, and most difficult, questions remaining in the neutrino sector. Searches for neutrinoless double β-decay may help to resolve this question, but are also sensitive to new, higher dimension ∆L = 2 operators. In this paper we place two phenomenological constraints on these operators at dimension d ≤ 11. Fir...

Tagging two-photon production offers a significant extension of the LHC physics programme. Effective luminosity of high-energy γγ collisions reaches 1% of the protonproton luminosity and the standard detector techniques used for measuring very forward proton scattering should allow for a reliable extraction of interesting twophoton interactions. Particularly exciting is a possibility of detecti...

The present status of soft hadron production in high energy heavy-ion collisions is summarized. In spite of strong evidence for extensive dynamical evolution and collective expansion of the fireball before freeze-out I argue that its chemical composition is hardly changed by hadronic final state interactions. The measured hadron yields thus reflect the primordial conditions at hadronization. Th...

1 Why supersymmetry? When the Large Hadron Collider at CERN takes up operations soon, its main objective, besides confirming the existence of the Higgs boson, will be to discover new physics beyond the standard model of the strong and electroweak interactions. It is widely believed that what will be found is a (at energies accessible to the LHC softly broken) supersymmetric extension of the sta...

The Standard Model partially unifies the strong, electromagnetic and weak interactions, suggesting a common origin for them. A more fundamental theory, a Grand Unified theory or a string theory, can complete this unification and explain many of the features which in the Standard Model are put in by hand. However many possible implementations of such a theory have been suggested. We emphasize th...