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in subjects: "*Electromagnetic Interactions"

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Analysis of NSTX Upgrade OH Magnet and Center Stack

The new ohmic heating (OH) coil and center stack for the National Spherical Torus Experiment (NSTX) upgrade are required to meet cooling and structural requirements for operation at the enhanced 1 Tesla toroidal field and 2 MA plasma current. The OH coil is designed to be cooled in the time between discharges by water flowing in the center of the coil conductor. We performed resistive heating and thermal hydraulic analyses to optimize coolant channel size to keep the coil temperature below 100 … more

Date: November 30, 2010

Creator: A. Zolfaghari, P. Titus, J. Chrzanowski, A. Salehzadeh, F. Dahlgren

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Charm D production in e/sup +/e/sup -/ annihilation at 29 GeV

Results are presented on the analysis of charm D Production from 300 pb/sup -1/ of data taken with the HRS Detector at PEP. The electroweak asymmetry is -8.4 +- 3.6% and R (D + D*) = 1.57 +- 0.17. Fragmentation functions for D/sup 0/, D/sup +/, D*/sup +/ production and the results of a search for the D** are given. 10 refs., 9 figs.

Date: January 1, 1986

Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Measurement of the electroweak asymmetry in the reaction e/sup +/e/sup -/. -->. tau/sup +/tau/sup -/ at 29 GeV

This paper reports the electroweak asymmetry in the reaction e/sup +/e/sup -/ ..-->.. tau/sup +/tau/sup -/ at 29 GeV. The results came from data taken with the High Resolution Spectrometer at PEP corresponding to an integrated luminosity of 256 pb/sup -1/. The 7372 observed events give A/sub tau tau/ = -(4.4 +- 1.4 +- 0.5)%. Events selected in the central region of the detector measure a total cross section of R/sub tau tau/ = 1.06 +- 0.02 +- 0.04. 5 refs., 1 fig.

Date: June 1, 1986

Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Multiplicity distributions in e/sup +/e/sup -/ annihilation at 29 GeV: a comparison with hadronic data

The charged particle multiplicity distributions for single jets in e/sup +/e/sup -/ annihilation at 29 GeV have been measured using the High Resolution Spectrometer at PEP. The shape of the distribution agrees well with a Poisson distribution. No correlation is observed between the multiplicities in the two jets of an event. For fixed values of the prong number of the total event, the multiplicity sharing between the two jets is in good agreement with a binomial distribution. These observations… more

Date: June 1, 1986

Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for spin-dependent effects in c-quark fragmentation

Events of the reaction e/sup +/e/sup -/ ..-->.. c anti c at 29 GeV were isolated by observing D* mesons through D*/sup +/ ..-->.. D/sup 0/..pi../sup +/ decay. The D/sup 0/ decay modes used are D/sup 0/ ..-->.. K..pi.., K3..pi.., and K..pi..(..pi../sup 0/). The data, which correspond to an integrated luminosity of 300 pb/sup -1/, were collected by the High Resolution Spectrometer at PEP. All angular distributions examined are consistent with being isotropic; there is no evidence for D* alignment… more

Date: 1986

Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Production of eta mesons in e/sup +/e/sup -/ annihilations at. sqrt. s = 29 GeV

Data from e/sup +/e/sup -/ annihilations at 29 GeV have been used to measure the production and fragmentation of eta mesons. The signal is observed in the eta ..-->.. ..gamma gamma.. decay channel. The fragmentation function for p/sub eta/ > 1.5 GeV/c agrees well with the shapes predicted by both the Lund and Webber models. However, the mean multiplicity is measured to be < n/sub eta/ > = 0.37 +- 0.08 eta mesons per hadronic annihilation event, which is significantly lower than the values predi… more

Date: June 15, 1987

Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J.M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Asymmetry in the angular distribution of inclusive A baryons from e/sup +/e/sup -/ annihilations at. sqrt. s = 29 GeV

The forward-backward asymmetry A expected from the ..gamma.. - Z/sup 0/ interference term in the process e/sup +/e/sup -/ ..-->.. q anti q is observed in the lab production angular distribution of high momentum A baryons. The data were collected with the High Resolution Spectrometer at PEP and an integrated luminosity of 256 pb/sup -1/ at ..sqrt..s = 29 GeV was used in the analysis. The asymmetry is seen to increase with the fractional energy z = 2E/..sqrt..s of the A due to the decreasing pres… more

Date: May 1986

Creator: Abachi, S.; Baringer, P.; Beltrami, I.; Bylsma, B. G.; DeBonte, R.; Koltick, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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lambda. production in e/sup +/e/sup -/ annihilations at 29 GeV

This paper presents measurements of the inclusive production cross sections of ..lambda.. baryons in e/sup +/e/sup -/ annihilations at ..sqrt..s = 29 GeV. The data sample corresponds to an integrated luminosity of 256 pb/sup -1/ collected with the High Resolution Spectrometer at PEP. Comparisons are made to the predictions of the Lund model. The data are well described using a strange diquark suppression parameter, (us/ud)/(s/d), of 0.89 +- 0.10/sub -0.16//sup +0.56/, and the measured ..lambda.… more

Date: May 1, 1986

Creator: Abachi, S.; Baringer, P.; Beltrami, I.; Bylsma, B.G.; DeBonte, R.; Koltick, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Observation of tensor and scalar mesons produced in e/sup +/e/sup -/ annihilation at 29 GeV

The production of the tensor mesons, integral/sup 0/(1270) and K*/sup 0/(1430), and the scalar meson S(975) have been observed in e/sup +/e/sup -/ annihilation at 29 GeV center of mass energy, using data obtained with the HRS detector at the PEP storage ring. The mean multiplicities for meson momenta greater than 1450 MeV/c are <n/sub f/sup 0//> = 0.11 +- 0.04, <n/sub K*/sup 0/(1430)/> = 0.10 +- 0.06, and <n/sub S/> = 0.05 +- 0.02 per hadronic event. The fragmentation functions of the tensor me… more

Date: January 1, 1986

Creator: Abachi, S.; Baringer, P.; Bylsma, B. G.; DeBonte, R.; Koltick, D.; Loeffler, F. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Study of intermittency in e sup + e sup minus annihilations at 29 GeV

Charged particle multiplicity distributions from e{sup +}e{sup {minus}} annihilations at 29 GeV have been analyzed in selected rapidity and azimuthal angle intervals. The data were taken with the High Resolution Spectrometer at PEP. The factorial moments of the multiplicity distributions increase as the rapidity interval is decreased, the so-called intermittency phenomenon. These direct measurements of the moments agree with values derived from negative binomial fits to our multiplicity distrib… more

Date: June 15, 1990

Creator: Abachi, S.; Derrick, M.; Kooijman, P.; Musgrave, B.; Price, L.; Repond, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Elastic Neutrino-Electron Scattering: A Progress Report on Exp734 at Brookhaven

I will report preliminary results on elastic neutrino-electron scattering from data taken with the 200 ton segmented liquid scintillator - proportional drift-tube neutrino detector at Brookhaven. Features of the detector (such as the active target and long radiation length) permit a uniquely clean signal. Prospects of results from the completed analysis and further data taking are discussed.

Date: January 1, 1983

Creator: Abe, K.; Ahrens, L. A. & Amako, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Progress in an Experiment to Measure Elastic Nu. Mu. E. -->. Nu. Mu. E Scattering

The experimental setup and preliminary results of nu..mu.. + e elastic scattering measurements are described. (WHK)

Date: January 1, 1983

Creator: Abe, K.; Ahrens, L. A. & Amako, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Measurement of nu/sub e/ and anti nu/sub e/ elastic scattering as a test of the standard model

Various tests of standard SU(2) x U(1) model of weak interactions which can be performed by measurements of electron and muon neutrino-electron elastic scattering are reviewed. Electron neutrino-electron elastic scattering has both a neutral current part as well as a charged current part, and therefore offers a unique place to measure the interference of these two amplitudes. A measurement of the y-dependence of neutrino-electron elastic scattering can separately measure g/sub V/ and g/sub A/ a… more

Date: January 1, 1982

Creator: Abe, K.; Taylor, F.E. & White, D.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Precision measurement of charge symmetry breaking in np elastic scattering at 347 MeV

Charge symmetry breaking in np elastic scattering at 347 MeV has been measured with high precision. From fits of the measured asymmetry curves over the angular range 53.4{degree} {le} {theta}{sub cm} {le} 86.9{degree}, the difference in the center-of-mass zero-crossing angles of the analyzing powers was determined to be 0.438{degree} {+-} 0.054{degree} (stat.) {+-} 0.051{degree} (syst.). Using the experimentally determined slope of the analyzing power, dA/d{theta} = ({minus}1.35 {+-} 0.05) {tim… more

Date: July 1, 1995

Creator: Abegg, R.; Berdoz, A.R. & Birchall, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Results on two-photon interactions from Mark II at SPEAR

Preliminary results on two-photon interactions from the SLAC-LBL Mark II magnetic detector at SPEAR are presented. The cross section for eta' production by the reaction e/sup +/e/sup -/ ..-->.. e/sup +/e/sup -/ eta' has been measured over the beam energy range from 2 to 4 GeV. The radiative width GAMMA/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), and A/sub 2/(1310) and f'(1515) mesons ha… more

Date: October 1, 1979

Creator: Abrams, G. S.; Alam, M. S. & Blocker, C. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Some First Results from the Mark II at SPEAR. [Branching Ratio, Cross Sections]

Preliminary results are given from the Mark II experiment at SPEAR on radiative decays of the psi' (3684) and on inclusive baryon production from 3.67 to 7.4 GeV center-of-mass energy. A 90% confidence level upper limit of 0.12% is given for BR(psi' ..-->.. ..gamma..eta'/sub c/(3455)) x BR(eta'/sub c/(3455 ..-->.. ..gamma..psi)). 10 references.

Date: June 1, 1979

Creator: Abrams, G. S.; Alam, M. S. & Blocker, C. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Study of heavy quark production with the Mark II at PEP

The methods adopted by the Mark II collaboration to study heavy quark production at PEP are described. Two complementary techniques are used: D* tagging using the decay chain D*/sup +/. D/sup 0/..pi../sup +/, D/sup 0/ ..-->.. K/sup -/..pi../sup +/, and inclusive lepton tagging using the characteristic p/sub T/ distributions to distinguish contributions from b and c quarks. These techniques are used to derive information about heavy quark fragmentation and about the weak coupling of heavy quarks. more

Date: October 1, 1983

Creator: Abrams, G.; Amidei, D.; Baden, A.; de la Vaissiere, C.; Gidal, G.; Gold, M. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Anomalous low mass e/sup +/e/sup -/ pair production in 17 GeV/c. pi. /sup -/p collisions

An experiment was performed at the Multiparticle Spectrometer using 17 GeV/c ..pi../sup -/ from the BNL AGS, triggering upon inclusive e/sup +/e/sup -/ production. Electron identification was based on two transition radiator detectors and lead-scintillator shower detectors. Good acceptance for the e/sup +/e/sup -/ pair covered the region x/sub F/ > 0.3 for all p/sub T/ and pair masses. Charged particles and photons associated with the e/sup +/e/sup -/ pair are detected over a large solid ang… more

Date: January 1, 1980

Creator: Abshire, G; Adams, M & Brown, C

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Status of the O. alpha. calculation of e sup + e sup - yields W sup + W sup - yields 4f(gamma)

We consider the full process e{sup +}e{sup {minus}} {yields} W{sup +}W{sup {minus}} {yields} 4f. We show that the off-shell effect are sizable and comparable to radiative effects. We give the exact results for hard bremsstrahlung processes e{sup +}e{sup {minus}} {yields} (4f + {gamma}) and the results of the O({alpha}) improved cross sections for e{sup +}e{sup {minus}} {yields} W{sup +}W{sup {minus}} including photon radiation. The status of the virtual corrections to the 4f-process is describe… more

Date: November 1, 1991

Creator: Aeppli, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Status of the O{alpha} calculation of e{sup +}e{sup -} {yields} W{sup +}W{sup -} {yields} 4f(gamma)

Date: November 1, 1991

Creator: Aeppli, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Properties of D* production in e/sup +/e/sup -/ annihilation at 29 GeV

D* production is studied in the decay chain D*/sup +/ ..-->.. D/sup 0/ ..pi../sup +/ with the D/sup 0/ observed in the K/sup -/..pi../sup +/ mode and the corresponding charge conjugate decays. The results were obtained from a preliminary analysis of an 80 pb/sup -1/ data sample of e/sup +/e/sup -/ annihilations at 29 GeV taken with the High Resolution Spectrometer at PEP. The excellent mass resolution of the HRS allows the study of the D* production and decay with very low background. We presen… more

Date: January 1, 1983

Creator: Ahlen, S.; Akerlof, C.; Baranko, G.; Baringer, P.; Beltrami, I.; Bender, D. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Study of quark fragmentation at 29 GeV

The study of multi-particle final state in high-energy reactions has a long history. Detailed studies of hadronic interactions at Fermilab and at the CERN ISR have shown that particles are emitted in clear jets of hadrons along the beam directions. For the highest energies, a small fraction of events contains large-angle jets originating from hard collisions, in addition to the beam and target fragmentation products. The clearest observation of jets has been in high-energy e/sup +/e/sup -/ reac… more

Date: January 1, 1983

Creator: Ahlen, S.; Akerlof, C.; Baranko, G.; Beltrami, I.; Bender, D.; Baringer, P. et al.

Item Type: Report

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

open access

Charged hadron production in e/sup /+//e/sup /-// annihilation at. sqrt. s = 29 GeV

We have used data from the Time Projection Chamber at the SLAC storage ring PEP to study the inclusive production of charged hadrons in e/sup /+//e/sup /-// annihilation at a center of mass energy of 29 GeV. Charged particles were identified by simultaneous dEdx and momentum measurements. We present cross sections and particle fractions for ..pi../sup/plus minus//, k/sup + -/, and p(/ovr/p//) as a function of energy, momentum, rapidity, and transverse momentum. We compare the predictions of var… more

Date: March 1, 1988

Creator: Aihara, H.; Alston-Garnjost, M.; Avery, R. E.; Barbaro-Galtieri, A.; Barker, A. R.; Barnett, B. A. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department