120421012
The psion family: Relativistic charmonium
The authors have reported earlier that the spectrum of the psion family suggests a treatment based on an O(4) harmonic-oscillator family with O(4) quantum number M = 0 (equally spaced, mass-squared linear Regge trajectories). This results in the new J/subP//subC/ quantum numbers: 0$sup ++$ for 2.8 GeV/ c$sup 2$; 2$sup ++$, 1$sup -+$, 0$sup ++$ for the 3.4-GeV/c$sup 2$ mass region. All radiative decays are related through a single O(4) coupling S/sub mu//sub nu/ F/sub mu//sub nu/, where S/sub mu//sub nu/ is the internal-space angular-momentum operator. The details of the calculations of radiative transition widths and of the $gamma$$gamma$ angular correlation functions are given. Experimental signatures are discussed and compared with the nonrelativistic charmonium scheme; among others J $Yields$ O (2.8) + $gamma$ and psi ' $Yields$ O (2.8) + $gamma$ are small, being forbidden in the strict O(4) limit. O (2.8) is expected to be narrow like all other psions below the 4.0-GeV/c$sup 2$ region. chi$sub 0$(3.41) and chi$sub 1$(3.49) total widths are expected to be around 630 keV and 185 keV respectively. The missing decays of psi ' could be due to psi ' $Yields$ O + $omega$ ( approx. 32%). (AIP)
119987004
Rishon model of quarks and leptons with double SU(2) symmetry and Dirac magnetic moments
Abstract Two-doublet rishon models are proposed to avoid some of the kinematic and dynamic difficulties of the single-doublet rishon model. One has point-like magnetic moments only for leptons. The other, based on an anti-pairing hypothesis, has point-like leptons and quarks.
115882781
Cheng-wu picture applied to gamma p ---> rho0 p and phi p
120400670
DERIVATION OF THE BARYON SU(6) MASS FORMULA FROM CHIRAL SU(3) x SU(3) CHARGE ALGEBRA.
14270584
Tau decays beyond the standard model
In a recent paper, 8 semileptonic parameters were defined to specify the most general Lorentz-invariant spin correlation functions for 2-body τ decays. These parameters can be used to search for anomalous Γ L , Γ T polarized-partial widths, for non-CKM-type leptonic CP violation, and for leptonic T FS violation. They can also be used to bound the effective-mass scales A for “new physics” arising from additional Lorentz structures, e.g. from lepton compositeness, tau weak magnetism, weak electricity, or second-class currents. It is emphasized that (i) for these tests “different modes have different merits” and that (ii) the parameters can be measured either by using spin-correlation techniques without polarized beams, or with longitudinally polarized beams.
121276027
Consequences of su(3)'' excitation in baryon resonances
123120030
The CDF SVX: A silicon vertex detector for a hadron collider
Abstract A silicon microstrip vertex detector is being constructed as an upgrade to the CDF detector at the Fermilab Tevatron-1 p p collider. This device, which is designed to operate in the hadron collider environment, should allow the tagging of long-lived heavy flavors produced in p p collisions. The mechanical and electronic design of this device are described in this paper.
121999587
Operational performance of a large liquid argon photon calorimeter
Abstract We describe the performance of a large (0.9 × 1.4 m2) liquid argon photon calorimeter in high energy experiments at Fermilab. Resolutions for π0 and electron showers, obtained under data-taking conditions, are compared with electron-beam calibration results. Exceptional spatial and time resolutions have been achieved for isolated showers (σx,y
8249400
Design and production of a new surface mount charge-integrating amplifier for CDF
The authors present their experiences in designing and producing 26000 new charge-integration amplifiers for the Collision Detector Facility (CDF), using surface-mount components. The new amplifiers were needed to instrument 920 new 24-channel CDF RABBIT boards, which are replacing an older design rendered obsolete by increases in the collision rate. Important design considerations were frequency response, physical size, and cost. Compared to the standard cascode, this amplifier has better power supply rejection, higher gain, higher bandwidth, and reasonably good noise figures. Higher than expected amplifier reliability, resulting in an easier checkout task, was an unexpected benefit.<<ETX>>
116135045
Eta gamma Decays of rho0, omega, and phi Mesons
eta..gamma.. decays of rho/sup 0/, ..omega.., and phi are studied. We find GAMMA (phi..-->..eta..gamma..) =55 +- 12 keV. Our data admit two solutions for (rho/sup 0/, ..omega..) ..-->..eta..gamma..: Either GAMMA (rho/sup 0/..-->..eta..gamma..) =50 +- 13 keV, GAMMA (..omega -->..eta..gamma..) =3.0/sup +2//sup .//sup 5//sub -//sub 1//sub .//sub 8/ keV, and the (..omega..,rho) ..-->..eta..gamma.. relative decay phase is near zero; or GAMMA (rho/sup 0/..-->..eta..gamma..) =76 +- 15 keV, GAMMA (..omega -->..eta..gamma..) =29 +- 7 keV, and the decay phase is near 180degree. (AIP)
120266108
CDF Front End Electronics: The Rabbit System
Abstract A new crate-based front end system has been built featuring low cost, compact packaging, fast readout, command capability, 16 bit digitization, and a high degree of redundancy. The crate can contain a variety of instrumentation modules and is designed to be placed near the detector. Remote, special purpose processors direct the data readout. Channel-by-channel pedestal subtraction and threshold comparison in the crate allow the skipping of empty channels. The system is suitable for the readout of a very large number of channels.