A FIVE RAY OSCILLOSCOPE FOR MEASURING PI+ MESON LIFETIME

title: HANDLING OF OSCILLOGRAMS ON THE SCANNING TABLES OF PIKOTYPE

title: Proportional Chamber Readout System

title: FOCUSING DOUBLE ARM SPECTROMETER

title: Search for parity-nonconservation effects in deep-inelastic μ-N interaction
abstract: The difference of the cross sections for deep inelastic scattering of muons with average momenta 21 GeV/ c with right and left helicity at large angles, i.e., with large momentum transfer, has been measured. No statistically-significant dependence of cross sections on the longitudinal polarization of muons has been found, i.e. no parity-nonconservation effects in deep inelastic μN interaction have been observed. The magnitude of the cross-section asymmetry R = [〈σ R 〉 − 〈σ L 〉] [〈σ R 〉+ + 〈σ L 〉] may be represented as R = β 〈 Q 2 〉 = (− 4 ± 6) × 10 −3 〈 Q 2 , (GeV/ c ) 2 〉. The limitations G o ( μ ) = (+ 6 ± 10) G have been obtained for the constant G o ( μ ) of vector-axial interaction ( G o (μ) 2 ) [ μ γα(1 + γ 5 )μ] J α o (hadron, V-A).

title: Pentaquarks in the Jaffe-Wilczek approximation
abstract: AbstractThe masses of 
$$uudd\bar s,{\text{ }}uudd\bar d$$
, and 
$$uuss\bar d$$
 pentaquarks are evaluated in a framework of both the effective Hamiltonian approach to QCD and the spinless Salpeter equation using the Jaffe-Wilczek diquark approximation and the string interaction for the diquark-diquark-antiquark system. The pentaquark masses are found to be in the region above 2 GeV. That indicates that the Goldstone boson exchange effects may play an important role in the light pentaquarks. The same calculations yield the mass of 
$$[ud]^2 \bar c$$
 pentaquark ∼3250 MeV and 
$$[ud]^2 \bar b$$
 pentaquark ∼6509 MeV.

title: Gluelump spectrum in the QCD string model
abstract: The spectrum of gluons in the adjoint source field is computed analytically using the QCD string Hamiltonian, containing only one parameter — string tension, fixed by meson and glueball spectrum. Spin splitting is shown to be small. A good agreement is observed with specially generated gluelump states measured on the lattice. The important role of gluelumps defining the behaviour of field-strength correlators is stressed and correspondence with earlier computations of the latter is established.

title: String formation and chiral symmetry breaking in the heavy-light quark-antiquark system in QCD
abstract: The effective quark Lagrangian is written for a light quark in the field of a static antiquark, explicitly containing field correlators as coefficient functions of products of quark operators. At large Nc the closed system of equations for the gauge-invariant quark Green’s function in the field of static source is examined analytically. The formation of the string connecting the light quark to the static source is observed numerically. The scalar Lorentz nature of the resulting confinement is shown to hold for the considered case, implying chiral symmetry breaking. The resulting spectrum with and without perturbative gluon exchanges is obtained numerically and compared to the B and D meson masses and heavy quark effective theory. PACS number~s!: 12.38.Gc, 12.38.Lg, 12.39.Hg

title: Nonperturbative corrections to the quark self-energy
abstract: Nonperturbative self-energy of a bound quark is computed gauge-invariantly in the framework of background perturbation theory. The resulting Δm 2 q is negative and is a universal function of string tension and current quark mass. The shift of hadron mass squared, M 2 , due to Δm 2 q is negative, large for light quarks, and solves the long-standing problem of Regge intercepts in relativistic quark models.

title: Glueball masses and Pomeron trajectory in nonperturbative QCD approach
abstract: Using a nonperturbative method based on asymptotic behaviour of Wilson loops we calculate masses of glueballs and corresponding Regge-trajectories. The method contains no fitting parameters and the mass scale is fixed by the meson Regge slope. Theoretical predictions for lowest glueball states are in excellent agreement with lattice results. The leading glueball trajectory and its relation to the Pomeron is discussed in details. Important role of mixing between glueball and q q trajectories is emphasized.