J. S. Hoftun

A study of the axial-vector form factor and second-class currents in antineutrino quasielastic scattering

Abstract The antineutrino quasielastic reaction ν μm p →μ + n has been studied in the Q 2 range up to 1.0 (GeV/ c ) 2 at the Brookhaven AGS. The value of the axial vector mass M A in the dipole parametrization of the from factor was determined from the shape of the Q 2 distribution to be 1.09±0.03±0.02 GeV/ c 2 . A search for second-class currents was also conducted. No significant effect was found.

Hadron and Electron Response of Uranium Liquid Argon Calorimeter Modules for the D0 Detector

We present the results of tests made on two types of uranium/liquid argon calorimeter modules, one electromagnetic and one hadronic, constructed for the D0 detector at the Fermilab Tevatron Collider. For electrons and hadrons with energies between 10 and 150 GeV, we present measurements of energy resolution, linearity of response, electromagnetic to hadronic response ratio (e/π), and longitudinal hadronic shower development. We have also investigated the effects of adding small amounts of methane to the liquid argon.

MEASUREMENT OF THE TOP QUARK PAIR PRODUCTION CROSS SECTION IN PP COLLISIONS

We present a measurement of the ttbar production cross section in ppbar collisions at root(s) = 1.8TeV by the D0 experiment at the Fermilab Tevatron. The measurement is based on data from an integrated luminosity of approximately 125 pb^-1 accumulated during the 1992-1996 collider run. We observe 39 ttbar candidate events in the dilepton and lepton+jets decay channels with an expected background of 13.7+-2.2 events. For a top quark mass of 173.3GeV/c^2, we measure the ttbar production cross section to be 5.5+-1.8 pb.

Design, construction, and performance of the electromagnetic module of the DØ end calorimeter

Author(s): Aihara, H.; Arthur, A.A.; Dahl, O.I.; Eberhard, P.H.; Edwards, W.R.; Fulton, R.L.; Haughian, J.M.; Madaras, R.J.; Roe, N.A.; Shuman, D.B.; Spadafora, A.L.; Stevenson, M.L.; Taylor, J.D.; Wenzel, W.A.

Precise Determination of Sin**2-

Measurements of the semileptonic weak neutral-current reactions ..nu../sub ..mu../p..--> nu../sub ..mu../p and nu-bar/sub ..mu../p..-->..nu-bar/sub ..mu../p which yield the absolute differential cross sections dsigma(..nu../sub ..mu../p)/dQ/sup 2/ and dsigma(nu-bar/sub ..mu../p)/dQ/sup 2/ described. The weak-neutral-current parameter, sin/sup 2/theta/sub W/, is determined to be sin/sup 2/theta/sub W/ = 0.220 +- 0.016 (stat)/sub -0.031//sup +0.023/(syst).

\theta^-

The authors discuss the requirements and architecture of the DO Level-2 data acquisition system as well as its current status. They then consider its implementation using a new generation of hardware which is currently under development. The major enhancement to the acquisition system will be the adaptation and use of new Q22MPM multiport memories. Block diagrams of the acquisition system and of the multiported memory are presented. >

w From Measurements of the Differential Cross-sections for

Abstract This paper describes the design criteria, construction, and performance of a detector to study neutral and charged current elastic neutrino interactions induced by neutrinos of average energy approximately 1 GeV from the Brookhaven National Laboratory Alternating Gradient Synchrotron.

\nu_\mu p \to \nu_\mu p

Abstract The D0 experiment has used the ‘Structured Analysis/Structured Design’ (SA/SD) methodology in its software development for the past year. The data flow diagrams and data dictionaries of structured analysis were the primary tools used in development of an ideal model of the D0 software system. These and the structure charts developed during the design phase form the basic documentation of the system. Real-time structured development techniques, e.g. state transition diagrams, are employed to describe control functions in some areas, e.g. in the calibration software. The SA/SD methodology has proven to be valuable in the formulation of ideas and in communication between software developers. The methodology and its application to D0 software are described and the benefits and problems are assessed. Problems finding adequate software tools for the VAX environment are discussed and a data dictionary manager developed by D0 using DEC RDB is described.

and

Measurements of the semileptonic weak neutral-current reactions ..nu../sub ..mu../p..--> nu../sub ..mu../p and nu-bar/sub ..mu../p..-->..nu-bar/sub ..mu../p which yield the absolute differential cross sections dsigma(..nu../sub ..mu../p)/dQ/sup 2/ and dsigma(nu-bar/sub ..mu../p)/dQ/sup 2/ described. The weak-neutral-current parameter, sin/sup 2/theta/sub W/, is determined to be sin/sup 2/theta/sub W/ = 0.220 +- 0.016 (stat)/sub -0.031//sup +0.023/(syst).

\bar{\nu}_\mu p \to \bar{\nu}_\mu p

The new generation of colliding beam experiments require new and more powerful systems for data acquisition. The DO experiment at Fermilabs Tevatron-I employs a multi-level trigger system to reduce the primary interaction rate of 50 KHz. to an event recording rate of 1-2 Hz. We describe the DO acquisition system, focusing primarily on the second level, which is based on a large parallel array of MicroVAX-IIs. Data flows from the detector readout crates at a maximum rate of 320 Mbytes/sec into dual-port memories associated with one selected processor in which a VAXELN based program performs the filter analysis of a complete event.