120370062
Jet finding in the Breit frame
Jet-finding algorithms for final states in deep-inelastic scattering are discussed from the experimental viewpoint. Transformations to the Breit frame of reference are investigated as function of the kinematical variables (x,Q2) in order to give an experimentalist an appreciation of the different way a favoured clustering algorithm would operate in the HERA detector and the Breit frames of reference.
121568291
Multiplicity distributions associated with charged hadron production over a range of transverse momentum and production angle at ISR energies
Abstract The charged multiplicity density M , associated with identified charged hadrons up to 3.0 GeV/ c in p T , is presented at ISR energies from 23.4 to 63.4 GeV and at 3 laboratory angles, as a function of pseudorapidity and azimuth.
125281002
Photoproduction of $K \bar{K} \pi$ Final States in the Photon Energy Range From 20-{GeV} to 70-{GeV}
CERN-OMEGA PHOTON COLLABORATION. PHOTOPRODUCTION OF & lt;K AK PI& gt; FINAL STATES IN THE ENERGY RANGE 20 TO 70 GEV. NO EVIDENCE IS FOUND FOR THE PHOTOPRODUCTION OF PHIPRIME(1680).
121682572
Correlations between two identified charged hadrons at the CERN ISR
Abstract We have measured the value of the correlation R (h 1 , h 2 ) between two identified charged hadrons ( h = π ± , K ± , p or p ) produced in pp collisions at the CERN ISR. One hardon was produced in the forward direction and the other at a large angle. Quantum number dependent effects have been observed.
122240842
Multiplicities associated with the production of pions, kaons or protons of high transverse momentum, at the ISR
Abstract In high-energy proton-proton collisions, the mean charged multiplicity M in the central region, associated with a high-PT hadron trigger at 90°, shows a linear dependence on both ln s and PT. M is measured to depend on the type (π ± , K ± , p or p ) of the idenfied high-PT trigger particle.
121816869
Associated photoproduction of a charmed meson and a charmed baryon
9203642
Domain bubbles of extra dimensions
``Dimension bubbles'' of the type previously studied by Blau and Guendelman [S.K. Blau and E.I. Guendelman, Phys. Rev. D40, 1909 (1989)], which effectively enclose a region of 5d spacetime and are surrounded by a region of 4d spacetime, can arise in a 5d theory with a compact extra dimension that is dimensionally reduced to give an effective 4d theory. These bubbles with thin domain walls can be stabilized against total collapse in a rather natural way by a scalar field which, as in the case with ``ordinary'' nontopological solitons, traps light scalar particles inside the bubble.
118912120
Excitation fields in a superconducting global string
SummaryA model of a straight superconducting global cosmic string is examined in a setting wherein the string supports a charge/current pulse described by a travelling wave along the string. Linearized field equations are obtained for fluctuations of the scalar and vector fields of the theory, and a set of approximate particular solutions are found for the case in which the linear charge density and the current of the string have equal magnitudes. Although the equations of motion seem to suggest that the scalar and vector excitation fields are massive inside the string core, the particular solutions show that they behave as effectively massless fields which propagate at the speed of light along the string along with the primary charge/current pulse. The effect of the mass parameter is to modulate the radial profile of the excitation fields. The vector excitation field generates radial and angular components for both the electric and magnetic fields, but the particular solutions do not describe the emission or absorption of electromagnetic radiation from the string.
119624600
Callan-Symanzik functions and asymptotic freedom in the Lee model
The Lee model was studied in a paper by Bender and Nash in the context of determining whether the model displays asymptotic freedom. This determination is based on the calculations of the Callan-Symanzik functions. Bender and Nash have renormalized the coupling constant off the mass shell. We have performed on-shell renormalization and evaluated the Callan-Symanzik ..beta.. and ..gamma.. functions. In agreement with Bender and Nash, we find that the Lee model is asymptotically free for space-time dimensions N 4 (odd N) the model is ultraviolet stable and not asymptotically free. Finally, we employ the Weinberg relation to demonstrate the mathematical equivalence between the ..beta.. function calculated in this paper and the one presented by Bender and Nash.
26418696
Generalized slow roll conditions and the possibility of intermediate scale inflation in scalar tensor theory
Generalized slow-roll conditions and parameters are obtained for a general form of scalar-tensor theory (with no external sources), having arbitrary functions describing a non-minimal gravitational coupling F(), a Kahler-like kinetic function k(), and a scalar potential V(). These results are then used to analyse a simple toy model example of chaotic inflation with a single scalar field and a standard Higgs potential and a simple gravitational coupling function. In this type of model inflation can occur with inflaton field values at an intermediate scale of roughly 1011 GeV when the particle physics symmetry-breaking scale is approximately 1 TeV, provided that the theory is realized within the Jordan frame. If the theory is realized in the Einstein frame, however, the intermediate scale inflation does not occur.
119206581
Dilatonic effects on a falling test mass in scalar-tensor theory
Effects of a 4d dilaton field on a falling test mass are examined from the Einstein frame perspective of scalar-tensor theory. Results are obtained for the centripetal acceleration of particles in circular orbits, and the radial acceleration for particles with pure radial motion. These results are applied to the specific case of nonrelativistic motion in the weak field approximation of Brans–Dicke theory, employing the exact Xanthopoulos–Zannias solutions. For a given parameter range, the results obtained from Brans–Dicke theory are qualitatively dramatically different from those of general relativity. Comments are made concerning a comparison with the general relativistic results in the limit of an infinite Brans–Dicke parameter.