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in creator/contributor: "Feldman, G. J."

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Prospects for physics at e/sup +/e/sup -/ linear colliders

The present thinking on high-energy e/sup /plus//e/sup /minus// linear colliders is reviewed, stressing those points that have consequences for detector design and physics analyses. Detector requirements are discussed. Experimental aspects of the physics that can be done at these colliders are discussed: first the general physics environment, then a standard process, W/sup /plus// W/sup /minus// detection, and finally four examples of the discovery potential of these colliders /emdash/ heavy qu… more

Date: March 1, 1988

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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PSI radiative decays

Inclusive and exclusive measurements of psi radiative decay are presented. The magnitude of hard inclusive radiative decay is comparable to the prediction f first order QCD, but the measured spectrum is considerably softer. In addition to measurements of radiative decays to the known pseudoscalar and tensor mesons, a sizable decay to a resonance of mass 1440/sub -15//sup +10/ MeV/c/sup 2/ in the K anti K..pi.. mode is observed. This may be the E(1420) meson. Supporting evidence is presented for… more

Date: May 1, 1980

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Electron-positron physics at 1 TeV

We discuss the motivation for TeV e/sup +/ e/sup )minus/) linear colliders, some aspects of their design, and the experimental consequences that follow from the design. After a brief discussion of the general physics environment, we consider the discovery potential of these colliders by examining three sample processes: the detection of new heavy leptons, standard Higgs bosons, and charged Higgs bosons. 13 refs., 22 figs., 5 tabs.

Date: March 1, 1988

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Lepton spectrum

Selected topics on the lepton spectrum are presented with special emphasis on tau decays and unpublished Mark II results from SPEAR and PEP. 42 references.

Date: October 1, 1981

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Report of the B-factory group: II, Accelerator technology

This report discusses the following topics on B-factory accelerators: Storage rings for the {Upsilon}(4S) and continuing Linear colliders for the {Upsilon}(4S) and continuum; and storage rings and linear colliders for the Z. 52 refs., 5 figs., 12 tabs.

Date: January 1, 1989

Creator: Siemann, R. H.; Cassel, D. G.; Feldman, G. J.; Alam, M. S.; Aleksan, R.; Atwood, W. B. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Search for heavy neutrinos produced in e/sup +/e/sup -/ annihilation

We report a search for long-lived heavy neutrinos produced by the neutral weak current in e/sup +/e/sup -/ annihilation at 29 GeV at PEP. Data from the Mark II detector are examined for evidence of events with one or more separated vertices in the radial range of 2 mm to 10 cm. No events were found that were consistent with the hypothesis of heavy neutrino production, eliminating the possibility of heavy neutrinos with decay lengths of 1 to 20 cm in mass range 1 to 13 GeV/c/sup 2/. 11 refs.

Date: May 1, 1985

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Particle identification using dE/dx in the Mark II detector at the SLC

The central drift chamber in the Mark II detector at the SLAC Linear Collider has been instrumented with 100-MHz Flash-ADCs. Pulse digitization provides particle identification through the measurement of average ionization loss in the chamber. We present the results of a study of system performance and outline the systematic corrections that optimize resolution. The data used are from a short test run at PEP with one-third of the FADCs installed and an extensive cosmic ray sample with the fully… more

Date: April 1, 1989

Creator: Boyarski, A.; Coupal, D. P.; Feldman, G. J.; Hanson, G.; Nash, J.; O'Shaughnessy, K. F. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Report of the B-factory Group: 1, Physics and techniques

The study of B meson decay appears to offer a unique opportunity to measure basic parameters of the Standard Model, probe for interactions mediated by higher mass particles, and investigate the origin of CP violation. These opportunities have been enhanced by the results of two measurements. The first is the measurement of a long B meson lifetime. In addition to allowing a simpler identification of B mesons and a measurement of the time of their decay, this observation implies that normal decay… more

Date: January 1, 1989

Creator: Feldman, G. J.; Cassel, D. G.; Siemann, R. H.; Alam, M. S.; Aleksan, R.; Atwood, W. B. et al.

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

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Opportunities and requirements for experimentation at high energy e/sup +/e/sup /minus// collider

Over the past fifteen years of high-energy physics, electron-positron annihilation has been the most productive of all reactions probing the fundamental interactions. The e/sup +/e/sup /minus// annihilation process is unique in offering at the same time copious production of novel particles, low backgrounds from more conventional physics, and the most efficient use of the energy which an accelerator provides. These features have allowed the detailed characterization of the charm and bottom quar… more

Date: May 1, 1988

Creator: Ahn, C.; Baltay, C.; Barklow, T. L.; Burchat, P. R.; Burke, D. L.; Cooper, A. R. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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e/sup +/e/sup -/ annihilation. [Review]

The status of resonances below 3 GeV, total cross sections, and inclusive D spectra at high energy are reviewed, and then a comprehensive review of the properties of the tau lepton is presented. 66 references (JFP)

Date: October 1, 1978

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Review of tau lepton properties. [Review]

The review of tau particle properties includes measurements of the branching ratios, the general modes, then a more detailed look at the semi-hadronic modes, and the upper limits for rare modes. Measurements of the tau mass, spin, and lifetime, the tau - ..nu../sub tau/ coupling and the ..nu../sub tau/ are considered mass. Finally, the lepton classification of the tau is discussed. 43 references. (JFP)

Date: November 1, 1978

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Perspectives in e/sup +/e/sup -/ physics

After a brief enumeration of the advantages of electron-positron collisions to study elementary particle physics, the present and future of electron-positron facilities are briefly reviewed, and the perspectives for future physics with electron-positron collisions are discussed. 20 refs., 10 figs. (LEW)

Date: November 1, 1986

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Inclusive charged hadron and K sup 0 production in two-photon interactions

The analogous process to quark pair production in e{sup +} e{sup {minus}} annihilation is the hard-scattering quark exchange process in {gamma}{gamma} interactions. This hard-scattering process is expected to dominate the cross section at high transverse momenta of the produced quarks. Experimentally, one has looked for this process in two-jet as well as inclusive particle production and has found a relatively low PT onset of hard scattering in {gamma}{gamma} interactions. This report examines … more

Date: March 1, 1988

Creator: Cords, D.; Boyer, J.; Butler, F.; Gidal, G.; Abrams, G. S.; Amidei, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Inclusive charged hadron and K{sup 0} production in two-photon interactions

Date: March 1, 1988

Creator: Cords, D.; Boyer, J.; Butler, F.; Gidal, G.; Abrams, G. S.; Amidei, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

OBSERVATION OF THE {eta}{sub c} (2980) PRODUCED IN THE RADIATIVE DECAY OF THE {psi}' (3684)

In a study of {psi}'(3684) radiative decays with the Mark II detector at SPEAR, we observe the decay sequence {psi}' {yields} {gamma}{eta}{sub c}(2980), with the {eta}{sub c}(2980) decaying into several completely reconstructed hadronic modes. We obtain a mass M = 2980 ± 8 MeV / c{sup 2} and a width {Gamma} < 40 MeV / c{sup 2} (90% confidence level), and present estimates of some of the decay branching ratios.

Date: July 1, 1980

Creator: Himel, T. M.; Trilling, G. H.; Abrams, G. S.; Alam, M. S.; Blocker, C. A.; Blondel, A. P. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurement of the Z boson resonance parameters

Using the Mark II detector at the SLC, we measure the Z mass and width to be 91.17 {plus minus} 0.18 GeV/c{sup 2} and 1.95{sup +0. 40}{sub {minus}0.30} GeV, respectively. From a fit in which the visible Z width is constrained to its Standard Model value, the number of neutrino species is determined to be 3.0 {plus minus} or <4.4 at the 95% confidence level. 13 refs., 20 figs., 4 tabs.

Date: November 1, 1989

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Production and decay of Z bosons at the SLC (SLAC Linear Collider)

My lectures at Cargese covered the very first physics results from the SLAC Linear Collider (SLC). At the time of this writing (December 1989), it seems most sensible to present a review of the results that were presented at the school in an updated form. The organization of this report will be to give a brief introduction to linear colliders and the SLC, then to describe the MARK II detector, and finally to review the current status of the three major physics topics discussed at Cargese: the Z… more

Date: December 1, 1989

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Properties of the tau lepton. [Review]

The measured properties of the tau lepton and its neutrino are reviewed. A constrained fit to the world data gives a tau branching fraction to an electron plus neutrinos (B/sub e/) of (17.4 +- 2.1)% and B/sub mu//B/sub e/ = 1.07 +- 0.17. New data on the tau ..-->.. pi nu mode are in agreement with the expected branching fraction. There is evidence for the tau ..-->.. A/sub 1/ nu mode, but the A/sub 1/ resonance cannot be conclusively established from the current data. The DELCO experiment estab… more

Date: June 1, 1978

Creator: Feldman, G. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Resonance production by two-photon interactions at SPEAR

Two-photon interactions have been studied with the SLAC-LBL Mark II magnetic detector at SPEAR. The cross section for {eta}' production by the reaction e{sup +}e{sup -} {yields} e{sup +}e{sup -}{eta}' has been measured at beam energies from 2.0 GeV to 3.7 GeV. The radiative width {Lambda}{sub {gamma}{gamma}}({eta}') has been determined to be 5.8 {+-} 1.1 keV ({+-}20% systematic uncertainty). Upper limits on the radiative widths of the f(1270), A{sub 2}(1310) and f'(1515) tensor mesons have been… more

Date: June 1, 1981

Creator: Jenni, P.; Burke, D. L.; Telnov, V.; Alam, M. S.; Boyarski, A. M.; Breidenbach, M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department