31307451
Double analog state in odd-A nuclei.
Measurements were performed using pion double charge exchange to observe the double isobaric analog state (DIAS) in the odd-[ital A] nuclei [sup 54]V, [sup 59]Co, [sup 115]In, and [sup 197]Au. These results are combined with data for other odd-[ital A] targets and used to investigate the [ital N], [ital Z], and [ital A] dependence of DIAS cross sections.
120478935
Vacuum polarization in quantum electrodynamics
116403039
THE M.I.T. BAG, 1976 EDITION
We assume (1,2) that hadrons consist of colored quarks and gluons, and that the dynamics is described by the standard non-Abelian gauge field theory. However, we also assume that space exists in two phases. In the first phase, I, ordinary space, colored fields are not carried on the spatial points. In the second phase, II, which is the kind of space inside hadrons, the spatial points carry colored field variables; Further, we assume that the second kind of space carries an energy per unit volume, BGT0, greater than the first kind and that the second kind of space can exist as bubbles in the first kind. This is done in a relativistically covariant way, by associating with the second kind of space a local stress-energy of the form, -gμν B. The phase II space is called a bag.
121596205
Solution of the equations for the green’s functions of a two dimensional relativistic field theory
SummaryThe explicit solution of the coupled set of equations for the Green’s functions for the self-coupled field theory model of Thirring is given. It is found that the infra-red problem causes no special difficulty. The question of how to define products of singular field operators at coincident space-time points arises and it is shown that the commutation relations for such products are not consistently given by making use of the formal expressions and the canonical commutation relations. The problem of gauge invariance in an external field is studied and it is shown that:a) the current and charge density do not commute at equal times, andb) this is necessary for and consistent with the gauge invariance of the field equations.RiassuntoSi dà la soluzione esplicita del gruppo accoppiato di equazioni per le funzioni di Green per il modello auto-accoppiato della teoria del campo di Thirring. Si trova che il problema infrarosso non genera particolare difficoltà. Sorge la questione sul modo di definire i prodotti degli operatori di campo singolari in punti coincidenti dello spaziotempo e si mostra che le relazioni di commutazione per questi prodotti non vengono espresse coerentemente facendo uso delle espressioni formali e delle relazioni di commutazione canonica. Si studia il problema della invarianza di gauge in un campo esterno e si mostraa) che la corrente e la densità di carica non commutano in tempi uguali, eb) che questo è necessario per l’invarianza di gauge delle equazioni del campo, e coerente con essa.
116663050
The Quark Model Pion and the PCAC Pion
An important problem in the theory of strong interactions is furnished by the least massive hadrons, the pseudoscalar meson octet. The difficulty is that there are two such octets.
122229005
Simple semiclassical model for the rotational states of mesons containing massive quarks
We present a semiclassical relativistic model for the orbital spectra of mesons, based on the assumption of a universal, flavor-independent linear confining interaction. Flavor dependence of the spectra arises from the quark masses.
41594474
Charm production in neutron-nucleon interactions.
Hadronic production of charmed particles in association with muons from their semileptonic decay has been observed in a high-resolution streamer-chamber experiment performed at Fermilab. A miss-distance analysis of the pictures gives a signal of 17.3 +- 4.7 events. Depending on the production model this corresponds to a range of neutron-nucleon cross sections from 8 to 50 ..mu..b, assuming an A/sup 2/3/ dependence.
30895858
CP violation and generation mixing.
7811061
Atomic-weight dependence of the production of hadron pairs by 800-GeV/c protons on nuclear targets.
Fermilab experiment 711 has investigated proton-nucleus collisions in which two high-transverse-momentum hadrons are produced forming high-mass ++, +{minus}, and {minus}{minus} charged states, using an 800-GeV/{ital c} proton beam on targets of beryllium, aluminum, iron, and tungsten. Our data cover the range in dihadron mass from 6 to 15 GeV/{ital c}{sup 2}. We show here that the dependence of the cross section on atomic weight {ital A} can be parametrized as {ital A}{sup {alpha}} where {alpha}=1.043{plus minus}0.011(stat){plus minus}0.025 (syst), and is independent of the charge state of the dihadron system.
36028712
Driven response of a trapped particle beam.
The dynamics of a metastable beam of particles injected'' into artificially excited resonance islands in the Fermilab Tevatron is studied. Evolution of the captured beam distribution is measured by an externally detectable coherent signal. Dynamical partitions observed in the control space of amplitude and tune of a focusing modulation are consistent with an equivalent mode of an ensemble of driven gravity pendula. The model's single parameter, the island tune {ital Q}{sub {ital I}} of small oscillations, is inferred as the central frequency of resonant detrapping under this weak drive.
32203233
Massive hadron pair production by 800 GeV/c protons on nuclear targets.
We report data on proton-nucleon collisions obtained on Fermilab experiment E711, in which high transverse momentum hadrons are produced near 90[degree] in the proton-nucleon center of mass forming high mass states, using an 800 GeV/[ital c] proton beam on targets of beryllium, aluminum, iron, and tungsten. The data presented cover the mass range from 7 to 15 GeV/[ital c][sup 2], the three dihadron charge states ++, +[minus], and [minus][minus], and parton-parton scattering angles up to cos[theta][sup *]=0.50. We present the differential mass dihadron cross section, as well as the angular and charge dependence of the measurement. The cross section as a function of the parton-parton scattering angle for the three charge states is shown to vary linearly with the value of the atomic weight. While the angular distributions are shown to be independent of the target type, a small dependence on the charge state of the distributions is observed. The data are shown to be in good agreement with extrapolations from previous measurements and phenomenological QCD calculations.