117133034
Detectors and backgrounds for a muon-muon collider. Working group report
First estimates of background muon fluxes at a detector vary by more than two orders of magnitude. More realistic calculations are needed. If the lower rates apply then it should be possible to build an experiment with the acceptance and performance required to study the major topics in the physics programme. Some features of a possible solenoid detector have been investigated, with tracking and calorimetry covering angles to within ±125 milliradians of the beam direction.
121772123
Real-photon physics at the linear collider; an introduction
Abstract In principle any e + e − collider can generate real γγ and eγ collisions at a significant fraction of the luminosity and energy available in e + e − mode. More R and D is needed to prove that this will work, and to cost it. The outline of the physics case is known but it needs to be sharpened if the real photon option is to included in the technical proposals for future linear colliders. If a light Higgs boson is found then the importance of making a direct measurement of its two photon partial width would make the case very strong.
118652844
Bubble Chamber Studies of the Beta-Decay of Hyperons
122699953
The Idea of a Compton-Collider*
A brief overview, from an experimentalist's point of view. of the possibilities and difficulties involved in building a photon-photon collider using beams produced in Compton backscattering from a linear e+e- or e-e- collider. Some hindsight is included from the successful March 1994 Berkeley workshop on gamma-gamma colliders.
120929739
A particle detector using solid neon frozen from a neon-hydrogen mixture
Abstract In developing an electromagnetic calorimeter to improve the analysis of neutrino events in large bubble chambers, the possibility of using a sandwich structure of lead and solid neon has been discussed. The tests reported here demonstrate that when neon-hydrogen mixtures, available in large quantities at CERN and Fermilab, are frozen in a small ionization counter the pulses produced by high energy muons are comparable to those seen previously with pure neon. It has also been demonstrated that contaminated and thus insensitive liquid argon yields clear particle pulses after it has been frozen solid.
118085897
Gamma‐gamma topics, and a look at mesonic goo
Results are shown on four topics in γγ Physics: exclusive production of high‐mass hadron pairs, the photon structure function Fγ2, jet distributions and charm production; leaving time at the end for ‘‘new headlines’’ in 0++ meson spectroscopy, mention of two new results on γγ → resonances and a summary of conclusions. Originally listed as Low Energy Tests of QCD the talk is better represented by its present title. Most of the topics discussed do involve QCD, though the main goal is not so much to test it as to find out how it can be used to understand and describe what is going on. (Results from L3 and CLEO on γγ production of charmonium were passed to Jeff Appel for his talk on ‘‘Heavy Quark Production and Spectroscopy’’.)
18713583
Lattice QCD calculations for the physical equation of state
In this report we consider the numerical simulations at finite temperature using lattice QCD data for the computation of the thermodynamical quantities including the pressure, energy density and the entropy density. These physical quantities can be related to the equation of state for quarks and gluons. We shall apply the lattice data to the evaluation of the specific structure of the gluon and quark condensates at finite temperature in relation to the deconfinement and chiral phase transitions. Finally we mention the quantum nature of the phases at lower temperatures.
120222511
Thermodynamics of a pion gas
Abstract The thermodynamics is presented for a gas of uncharged pions coupled to a static nucleon background through a classical Yukawa interaction. By using invariant phase space in the grand canonical ensemble it is possible to write a general analytical form for the thermodynamical functions.
15157692
Entropy for diquarks in exotic quark states
We discuss the quantum state structure on the basis of $SU(3)_c$ for some known exotic quark systems using a model which describes these particular states as highly correlated diquarks and antidiquarks. We are then able to calculate for a single colored diquark a finite von Neumann entropy from the quantum reduced density matrix, from which we explicitly evaluate the likelihood of certain arrangements of quark flavors in a given diquark. These results can be related to some recently experimentally found pentaquark systems as well as a possible model for the scalar mesons.
119432339
Charmonium at CLEO-c
Results are presented on Charmonium using data collected with the CLEO III and CLEO-c detectors at the Psi(2S) and Psi(3770). Measurements include, the first observation of the hc(1P1) state, the electronic widths of the J/Psi and Psi(2S), the two photon width of the Chic2 and hadronic decays of the Psi(2S).
123498944
Condensation of light bosons in gauge theories
Abstract We investigate the thermodynamical properties of particular physical systems containing light bosons arising in gauge theories. Here we specifically consider certain decays involving heavy bosons in equilibrium with these light bosons and photons. We show explicitly how the necessary conditions for Bose-Einstein condensation of the light bosons are fulfilled in in these reactions. Finally we discuss some estimates on the critical densities for certain extreme cases.