75 Matching Results

Search Results

Advanced search parameters have been applied.

in publisher: "European Organization for Nuclear Research"

open access

Particle identification in ultrarelativistic nuclear collisions

The role of particle identification (PID) in both fixed-target and colliding-beam studies of ultrarelativistic nuclear (URN) collisions is examined. The demands placed on the PID systems by peculiarities of URN collisions, such as large multiplicities and the need for simultaneous measurement of a number of observables, are discussed. A variety of PID techniques are reviewed, with emphasis on their applicability and efficiency in the environment of such collisions. Two examples of PID as incorp… more

Date: April 1, 1986

Creator: DiGiacomo, N.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Bag model, the hyperspherical formalism and the heavy baryons

The bag model framework is used to discuss the heavy baryons, triple flavored objects like ccc, cbb, etc. A nonrelativistic picture seems justified. It is insisted that the long-range interaction consist of a genuine three-body force. Once the potential energy of the three quarks is determined, the three-body Schroedinger equation is solved by the method of hyperspherical expansion. 1 table. (RWR)

Date: January 1, 1980

Creator: Richard, J. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Radiative corrections in SU/sub 2/ x U/sub 1/ LEP/SLC

We show the sensitivity of various experimental measurements to one-loop radiative corrections in SU/sub 2/ x U/sub 1/. Models considered are the standard GSW model as well as extensions of it which include extra quarks and leptons, SUSY and certain technicolor models. The observation of longitudinal polarization is a great help in seeing these effects in asymmetries in e/sup +/e/sup -/ ..-->.. ..mu../sup +/..mu../sup -/, tau/sup +/tau/sup -/ on Z/sup 0/ resonance. 25 refs., 22 figs., 10 tabs.

Date: June 1, 1985

Creator: Lynn, B. W.; Peskin, M. E. & Stuart, R. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Access control system for ISABELLE

An access system based on the one now in operation at the CERN ISR is recommended. Access doors would presumably be located at the entrances to the utility tunnels connecting the support buildings with the ring. Persons requesting access would insert an identity card into a scanner to activate the system. The request would be autologged, the keybank adjacent to the door would be unlocked and ISABELLE operations would be notified. The operator would then select the door, activating a TV-audio li… more

Date: August 17, 1977

Creator: Potter, K. & Littenberg, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Uranium scintillator calorimeter at the CERN ISR

The design, Monte Carlo studies and test beam results of a uranium/scintillator calorimeter to be installed in the Intersecting Storage Ring (ISR) at CERN are described. In its final stage the calorimeter will cover the full azimuth over a polar region of 45/sup 0/ < theta < 135/sup 0/. The full calorimeter is built in a modular way from 128 stacks, with each stack internally subdivided into six cells of 20 x 20 cm/sup 2/ cross section. The readout is by wavelength shifting (WLS) plates w… more

Date: January 1, 1980

Creator: Gordon, H; Killian, T & Ludlam, T

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Experiments in the fragmentation regions

The fragmentation region is generally defined as the rapidity range where most of the valence partons of the incoming hadrons (or nuclei) are found after normal inelastic interactions. The disadvantages of the existing intersection region for fragmentation region studies are discussed and a slightly modified design is proposed which allows study of the fragmentation region. The considerations which led to the design of a spectrometer magnet are then outlined and some approaches to specific expe… more

Date: January 1, 1985

Creator: Faessler, M.A.; Bond, P.D. & Remsberg, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Prospects for supergravity

Present particle phenomenology appears to be successfully described by a renormalizable gauge theory based on the low-energy group SU(3)/sub color/ x SU(2)/sub left/ x U(1). The three effective coupling constants of this theory vary with energy according to the renormalization group equations and become approximately equal at an energy of about 10/sup 14/ - 10/sup 15/ GeV, where one can attempt a grand unified theory (GUT) based on a gauge group with only one coupling constant and containing th… more

Date: August 1, 1980

Creator: Zumino, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

1966 CERN--LRL--RHEL Shielding Experiment at the CERN Proton Synchrotron.

No Description Available.

Date: September 1968

Creator: Gilbert, W. S.; Shaw, K. B. & Fortune, R. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Study of direct single photons and correlated particles in proton-proton collisions at. sqrt. s = 62. 4 GeV

As part of a study of large p/sub T/ phenomena in proton-proton collisions at the CERN ISR, a search for direct single photon production has been performed. A statistical division of the data sample into the fraction consistent with single photon production and the fraction due to multiphoton decays of neutral hadrons is accomplished by measuring the average conversion probability for the sample in a one radiation length thick converter. The fraction of the sample attributable to direct single … more

Date: January 1, 1980

Creator: Angelis, A. L. S.; Besch, H. J. & Blumenfeld, B. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Transverse and Zero Degree Energies Observed in sub 16/O Induced Nuclear Collisions at 60 and 200 A GeV

Results from QCD calculations indicate that a sufficiently high energy densities, nuclear matter may undergo a transition to a phase in which quarks and gluons are deconfined. Nuclear collisions at very high energies are believed to be well suited from producing the conditions required for this phase transition to take place. At the CERN SPS, sufficiently high energy densities can only be reached if the degree of nuclear stopping involved is sufficiently high. Consequently, one of the main goal… more

Date: January 1, 1987

Creator: Gustafsson, H. A.; Albrecht, R.; Awes, T. C.; Baktash, C.; Beckmann, P.; Berger, F. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Correlations between the production of prompt positrons at low transverse momentum and the associated charged multiplicity

The production of prompt positrons in pp-collisions at ..sqrt..s = 63 GeV and y - 0 has been measured as a function of the associated charged particle multiplicity over the P/sub T/ internal 0.12 < P/sub T/ < 1.0 GeV/c. Preliminary results indicate that the production of positrons is proportional to the square of the mean multiplicity at low P/sub T/ (< 0.4 GeV/c). Such a square dependence is not expected from final state sources such as hadronic bremsstrahlung or hadronic decays. It could howe… more

Date: January 1, 1986

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

HARP: high-pressure argon readout for calorimeters

Steel tubes of approximately 8 mm O.D., filled with Argon gas to approx. 200 bar, are considered as the active element for a charge collecting sampling calorimeter readout system. The tubes are permanently sealed and operated in the ion chamber mode, with the charge collection on a one-millimeter concentric anode. We present the motivation for such a device, including Monte Carlo predictions of performance. The method of construction and signal collection are discussed, with initial results on … more

Date: January 1, 1982

Creator: Barranco-Luque, M.; Fabjan, C. W. & Frandsen, P. K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

3081/E processor and its on-line use

The 3081/E is a second generation emulator of a mainframe IBM. One of it's applications will be to form part of the data acquisition system of the upgraded Mark II detector for data taking at the SLAC linear collider. Since the processor does not have direct connections to I/O devices a FASTBUS interface will be provided to allow communication with both SLAC Scanner Processors (which are responsible for the accumulation of data at a crate level) and the experiment's VAX 8600 mainframe. The 3081… more

Date: May 1, 1985

Creator: Rankin, P.; Bricaud, B.; Gravina, M.; Kunz, P. F.; Oxoby, G.; Trang, Q. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Electroweak interactions at the SSC

Production of the gauge bosons, W/sup +/, W/sup -/, and Z/sup 0/ in various combinations at the Superconducting Super Collider is considered. Possibilities for producing Higgs bosons and detecting them are then evaluated. 18 refs. (LEW)

Date: August 1, 1985

Creator: Cahn, R. N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Oasis in the desert: weakly broken parity in grand unified theories

A discussion of low energy parity restoration in simple grand unified theories, such as SO(10), is presented. The consistency of phenomenological requirements and unification constraints is emphasized and various predictions of the theory are stressed, in particular: substantially lighter W and Z bosons than in the standard model and increased stability of the proton with tau/sub p/ approx. = 10/sup 38/ years.

Date: July 1, 1981

Creator: Senjanovic, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Proposal for the systematic naming of mesons and baryons

Twenty years ago, the Particle Data Group adopted a systematic naming convention for baryons: the symbols N, ..delta.., ..lambda.., ..sigma.., ..xi.., and ..cap omega.. were to identify the isospin and strangeness, The mesons, by contrast, have become an alphabet soup of uninformative names - theta, iota, xi, zeta, g/sub T/, g/sub s/, H, E, delta, h, g, r, kappa, etc. -, and in some cases identical names are used for mesons with different quantum numbers (A, B, and D). Furthermore, experimental… more

Date: October 1, 1984

Creator: Porter, F. C.; Hernandez, J. J.; Montanet, L.; Roos, M.; Toernqvist, N. A.; Barnett, R. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Quark--parton model with large parton k/sub T/

The quark--parton model is generalized to allow for arbitrarily large parton k/sub T/. Since it is expected that < k/sub T/ > will rise with Q/sup 2/ in (highly virtual) photon mediated processes, this generalization is necessary to restore the applicability of the quark-parton model. By treating k/sub T/ as an essential kinematical variable, the introduction of a new scaling variable z is considered. Together with Bjorken's x variable, a unified kinematical description is given of the four dis… more

Date: February 2, 1978

Creator: Hwa, R.C.; Matsuda, S. & Roberts, R.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Applications of the second-order achromat concept to the design of particle accelerators

A property of the second-order achromat, whereby dipole and sextupole families may be inserted into a lattice for chromatic corrections without introducing second-order geometrical (on momentum) optical distortions, has been incorporated in several new particle accelerator designs. These include the SLC at SLAC, LEP at CERN, the EROS pulse stretcher ring at Saskatoon, the CEBAF ring at SURA, and the MIT ring.

Date: May 1, 1985

Creator: Brown, K.L. & Servranckx, R.V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Test results of the AFS Hadron Calorimeter at the CERN ISR

The AFS hadron calorimeter has been designed to permit unbiased selection and study of events characterized by large transverse energy. Half of the calorimeter is now installed at the Intersecting Storage Rings at CERN; in its final form it will cover the full azimuth over a polar region of 40/sup 0/ < theta < 140/sup 0/. The calorimeter is built in a modular way from 128 uranium stacks (plus 64 copper catchers), each of which is a fine sampling uranium/copper scintillator sandwich. Uranium is … more

Date: January 1, 1981

Creator: Botner, O.; Burkert, V. & Di Ciaccio, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Performance comparisons of low emittance lattices

In this paper, the results of a performance analysis of several low emittance electron storage ring lattices provided by various members of the Lattice Working Group are presented. Altogether, four lattices were investigated. There are two different functions being considered for the low beam emittance rings discussed here. The first is to serve as a Damping Ring (DR), i.e., to provide the emittance damping required for a high energy linear collider. The second is to provide beams for a short w… more

Date: May 1, 1987

Creator: Delahaye, J. P. & Zisman, M. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Operation and maintenance linear accelerator. Conference summary

In the opening talk of this meeting, G. Kane defined the minimal standard model to be: (a) three generations of quarks and leptons; (b) massless neutrinos; (c) SU(3)/sub colour/ x SU(2)/sub L/ gauge theory; (d) one neutral Higgs boson; and (e) CP violation solely in the mass matrix. Reaching this point has been the tremendous achievement of the past decade. We have witnessed the discoveries of charm and the third generation, the discovery of neutral currents and the detailed confirmation of SU(… more

Date: January 1, 1983

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

RFQ as a particle decelerator

The idea of using the radio-frequency quadrupole (RFQ) as a particle decelerator is a straightforward one. This idea originated about a year or so ago in connection with the antiproton ring LEAR (CERN, Geneva). The complications began when one tries to satisfy the requirements put forward by the experimenters. In this paper, several decelerating schemes have been proposed, each one satisfying some specific demands. In particular, the conservation of beam quality in all the phase planes and the … more

Date: January 1, 1985

Creator: Billen, J. H.; Crandall, K. R.; Wangler, T. P. & Weiss, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High neutral transverse energy events at the CERN ISR

The CERN-Oxford-Rockefeller (COR) collaboration has obtained neutral transverse energy, E/sub T//sup 0/, spectra in pp collisions at ..sqrt..s = 30.5, 45.0, and 62.3 GeV. Evidence is presented for the increasing dominance of 2-jet events as E/sub T//sup 0/ increases.

Date: January 1, 1983

Creator: Cox, P. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

SLC Positron Damping Ring Optics Design

The basic SLAC Linear Collider operation scheme assumes the use of two damping rings, one for the e/sup -/, one for the e/sup +/, in order to reduce the colliding beam normalized emittances to 30 ..pi.. ..mu..radm hence raising the corresponding luminosity by a factor 170. The e/sup -/ damping ring optics, designed by H. Wiedemann, has been extensively studied and modelled since it's completion at the end of 1982. The e/sup +/ damping ring being built will be based on the same design except for… more

Date: April 1, 1985

Creator: Delahaye, J. P. & Rivkin, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department