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in subjects: "Mass Spectra"

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Inclusive. eta. production in. tau. decays

We have searched for inclusive eta production in tau decays using a sample of 2553 events of e{sup +}e{sup minus} {yields} {tau}{sup +}{tau}{sup minus} in the one-three topology. The data were taken with the High Resolution Spectrometer at {radical}s = 29 GeV. Our results are based on an analysis of the {pi}{sup +}{pi}{sup minus} invariant mass spectrum to find the narrow peak resulting from the decay sequence {tau} {yields} {eta}x and {eta} {yields} {pi}{sup +}{pi}{sup minus}{pi}{degree}. No c… more

Date: January 1, 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

open access

Transverse momentum signatures for heavy Higgs bosons

Heavy Higgs bosons produced by WW fusion at the SSC will have transverse mementum of order M/sub w/. The background due to q anti q ..-->.. ZZ will produce pairs with characteristically less transverse momentum. This provides a useful discriminator. It may be possible to tag the WW fusion events in a manner analogous to that used in two photon physics. 12 refs., 4 figs.

Date: January 1, 1986

Creator: Cahn, R. N.; Ellis, S. D.; Kleiss, R. & Stirling, W. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Recent results on weak decays of charmed mesons from the Mark III experiment

Recent results from the Mark III experiment on weak decays of charmed mesons are presented. Measurements of the resonant substructure of D{sup 0} {yields} K{sup {minus}}{pi}{sup +}{pi}{sup {minus}}{pi}{sup +} decays, the first model independent result on D{sub s} {yields} {phi}{pi}{sup +}, as well as limits on D{sub s} {yields} {eta}{pi}{sup +} and D{sub s} {yields} {eta}{prime}{pi}{sup +} are described. The implications of these new results are also discussed. 37 refs., 7 figs., 4 tabs.

Date: October 20, 1989

Creator: Browder, T. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Hadron collider physics at Fermilab

The hadron collider physics program at Fermilab, Tevatron-I, has recently provided considerable data samples to two high beta experiments as well as one low beta general purpose Collider Detector at Fermilab (CDF). A brief description of the Tevatron collider and the high beta experiments is followed by a discussion of hard scattering results from CDF. The prospects for growth in this exciting physics program are outlined. 20 refs., 29 figs., 1 tab.

Date: January 1, 1989

Creator: Nodulman, L.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Production of chi mesons in 225 GeV/c. pi. /sup -/Be interactions

Gamma rays associated with psi mesons have been studied in 225 GeV/c ..pi../sup -/Be interactions. The psi-..gamma.. mass spectrum shows an excess of 47 +- 11 events above background centered at 3.531 GeV/c/sup 2/ with an rms width of 22.4 MeV. Attributing this excess of events to the decay chi ..-->.. psi ..gamma.. implies that 38 +- 9 % of all psi mesons are produced by this mechanism. The experimental setup and results are detailed.

Date: September 1, 1981

Creator: Hossain, S.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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Study of exclusive central hadron production at the ISR as a search for gluonium states: the axial field spectrometer collaboration

We present a preliminary report on a study of the exclusive reaction pp ..-->.. pph/sup +/h/sup -/ (h = ..pi..,K,p) at ..sqrt..s = 63 GeV and ..sqrt..s = 45 GeV, with h/sup +/ and h/sup -/ in the central region. This reaction has been suggested as a method of searching for gluonium states. The mass distributions in the ..pi../sup +/..pi../sup -/ system appear to be identical at the two values of ..sqrt..s. They show a rapid order of magnitude decrease in cross-section at 1000 MeV/c/sup 2/ and 1… more

Date: January 1, 1983

Creator: Akesson, T.; Albrow, M.G.; Almehed, S.; Batley, R.; Benary, O.; Boeggild, H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Results from AGS E845: K sub L sup 0 yields. pi. sup 0 e sup + e sup minus , e sup + e sup minus. gamma. , e sup + e sup minus e sup + e sup minus

Results from AGS experiment 845 are reviewed. The data was collected during 1989. Final results on K{sub L}{sup 0} {yields} {pi}{sup 0}e{sup +}e{sup {minus}} and e{sup +}e{sup {minus}} {gamma} are described. Preliminary results on e{sup +}e{sup {minus}}{gamma}{gamma} and e{sup +}e{sup {minus}}e{sup +}e{sup {minus}} are discussed. 10 refs., 5 figs.

Date: January 1, 1991

Creator: Morse, W.M.; Leipuner, L.B.; Larsen, R.C.; Jastrzembski, E. (Brookhaven National Lab., Upton, NY (USA)); Adair, R.K.; Greenlee, H.B. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Searching for the Higgs in ep collisions at LEP/LHC

We investigate the possibility to observe an intermediate mass Higgs in ep collisions at LEP/LHC. We find that such a particle can be observed once a reasonable level of flavor identification is available to separate efficiently the b{bar b} decay mode of the Higgs from most of the background. 18 refs., 11 figs., 7 tabs.

Date: November 1, 1990

Creator: Grindhammer, G.; Haidt, D.; Ohnemus, J.; Vermaseren, J. & Zeppenfeld, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Spectroscopy of transient neutral species via negative ion photoelectron spectroscopy

Negative ion photoelectron spectroscopy has been used to study two types of transient neutral species: bound free radicals (NO{sub 2} and NO{sub 3}) and unstable neutral species ((IHI) and (FH{sub 2})). The negative ion time-of-flight photoelectron spectrometer used for these experiments is described in detail.

Date: December 1, 1991

Creator: Weaver, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Preliminary results from the Mark II detector. [Transverse momentum, cross sections, branching ratio]

Preliminary results from the SLAC-LBL Mark II magnetic detector at SPEAR are presented. Discussed are two-photon production of eta' and recent work on psi and psi' decays. 24 references.

Date: May 1, 1979

Creator: Scharre, Daniel L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Single leptons from heavy quark production

We consider the single lepton decay mode of heavy quarks as a signature of heavy quark pair production at the SSC. We find that events with multijets (n/sub jet/ greater than or equal to 3) and a single high p/sub T/ lepton are a good signal for heavy quark production.

Date: August 1, 1987

Creator: Dawson, S. & Godfrey, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The neutral kaon program at Fermilab and recent E731 results

Currently, Fermilab has a long-range program in neutral kaon physics which covers a wide variety of physics topics. In this report, I will be discussing the latest results from experiment E731 on the radiative decay of neutral kaons K{sub L,S} {yields} {pi}{sup +}{pi}{sup {minus}} {gamma}. These results include the first measurement of two new CP violation parameters: {eta}{sub +} {sub {minus}}{gamma} = (2.60{plus minus}0.54{plus minus}0.21) {center dot} 10{sup {minus}3}, and {phi}{sub +}{sub {… more

Date: September 1, 1991

Creator: Ramberg, E.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Second class current effects in tau lepton decay

Experiments to see the effects of second class currents in neutrino interactions are described. Evidence from tau lepton decay is discussed, including the ''one-prong anomaly'' and direct observation of eta meson production in tau decay. (LEW)

Date: January 1, 1987

Creator: Derrick, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Solar wind heavy ions from energetic coronal events

Ions heavier than those of He can be resolved in the solar wind with electrostatic E/q analyzers when the local thermal temperatures are low. Ordinarily this condition prevails in the low speed solar wind found between high speed streams, i.e. the interstream, IS, solar wind. Various ions of O, Si and Fe are resolved in IS heavy ion spectra. Relative ion peak intensities indicate that the O ionization state is established in the IS coronal source regions at approx. 2.1 x 10/sup 6/K while the st… more

Date: January 1, 1978

Creator: Bame, S.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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New directions in elementary particle physics: p anti p from very low to very high energies

The review covers low energy anti pp physics including annihilation processes, the spectroscopy of baryonium states, quasinuclear states and their relation to baryonium, the spectroscopy of protonium, and access to the whole charmonium family. High energy anti pp physics is reviewed covering total cross section rise, the common shape of cross sections, real part of forward amplitude, particle production, quantum number excitation, high transverse momentum, and high mass lepton pair. Also review… more

Date: January 1, 1979

Creator: Jacob, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The Soudan 2 honeycomb calorimeter

Soudan 2 is an 1100-ton honeycomb tracking calorimeter which is being constructed to search for nucleon decay. The detector consists of finely segmented iron instrumented with long drift tubes, and records three spatial coordinates and dE/dx for every gas crossing. Excellent event reconstruction capability, particle identification and muon sign and direction determination give superior rejection of the neutrino background to nucleon decay in many modes. The first 620 tons of Soudan 2 are now in… more

Date: December 1, 1990

Creator: Garcia-Garcia, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Bilocal field theory and a model for meson spectroscopy. Part I. Trident production by high energy charged particles on nuclei. Part II. [Harmonic oscillator quark model, radiative corrections, cross sections covariant perturbation theory, interference]

Bilocal field theory for quark confinement is considered in a combination of bilocal field theory with the covariant harmonic oscillator quark model. The formalism can be viewed as a direct generalization of local Lagrangian field theory. Following the usual local theory, the variational principle is used to find the Euler - Lagrange equation for the bilocal field. For a special class of Lagrangian densities satisfying a boundary condition on the hypersurface of the internal domain which is cal… more

Date: May 1, 1979

Creator: Mita, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Physics possibilities at LHC/SSC

This document reviews some recent work on physics simulations for SSC/LHC. Included are reviews of some of the recent developments in physics simulations for the SSC/LHC and comments upon the requirements that are placed upon detectors by the need to extract specific physics signatures. The material in the various EOI/LOI documents submitted to the SCC Laboratory and the work done at the Aachen LHC workshop are discussed. In the following discussion 1 SSC (LHC) year corresponds to an integrated… more

Date: April 25, 1991

Creator: Hinchliffe, I.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The production of J//psi/ and associated particles in the collision of 530 GeV/c protons and pions with nuclear targets

We have studied the production of the J//psi/ and associated particles using the E672/E706 spectrometer at Fermilab. Preliminary results are presented from the first run in 1987--1988 with 530 GeV/c p//pi//sup +/ and /pi//sup /minus// beams on a variety of nuclear targets. The A-dependance of J//psi/ production with /pi//sup /minus// beam was found to agree with an A/sup /alpha// parametrization with /alpha/ = 0.85 /plus minus/ 0.06 for X/sub F/ > 0.1. We have found that (41 /plus minus/ 22)% o… more

Date: January 1, 1989

Creator: De, K.; Crittenden, R.; Dzierba, A.; Kartik, S.; Li, R.; Markham, S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Influence of water vapor and decomposition products on the positive- and negative-ion spectra of SF/sub 6/ corona

We report on the positive- and negative-ion spectra obtained from in-situ mass spectrometric analyses of ions sampled from corona discharges in SF/sub 6/ at P = 6.7 kPa (50 Torr). In positive-ion spectra the presence of water vapor results in the formation of water cluster ions of the form H/sup +/(H/sub 2/O)/sub n/. The distribution of cluster sizes shifts to smaller clusters as the water vapor content decreases. In addition to the SF/sub 6/ fragment ions (SF/sub 5//sup +/, SF/sub 3//sup +/, a… more

Date: January 1, 1989

Creator: Sauers, I.; Siddagangappa, M. C. & Harman, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Recent results on hadronic D/sub s/ and D meson decays from the Mark III

Recent results on hadronic D/sub s/ and D decays from the Mark III collaboration are presented. The absolute branching ratio B(D/sub s//sup +/ /yields/ /phi//pi//sup +/) is studied by searching for fully reconstructed e/sup +/e/sup /minus// /yields/ D/sub s/*/sup /plus minus//D/sub s//sup /minus plus// events using seven hadronic decay modes of the D/sub s//sup +/. A limit of B(D/sub s//sup +/ /yields/ /phi//pi//sup +/) < 4.1% at 90% C.L. is obtained. Evidence is presented for the decay D/sub s… more

Date: July 1, 1989

Creator: Adler, J.; Bai, Z.; Blaylock, G. T.; Bolton, T.; Brient, J. C.; Browder, T. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Indications for the decays D/sub s//sup +-/. -->. eta. pi. /sup +-/ and D/sub s//sup +-/. -->. eta'. pi. /sup +-/

A search for D/sub s//sup +-/ decays into eta ..pi../sup +-/ and eta' ..pi../sup +-/ has been performed by the MarkII collaboration at the PEP e/sup +/e/sup -/ storage ring. Eta particles are reconstructed by their ..gamma gamma.. decay mode. The eta fragmentation has been measured and found to be in good agreement with the Lund model prediction. Eta' production has been measured for the first time in e/sup +/e/sup -/ high energy annihilation. Good indications are found for both decay modes D/s… more

Date: November 1, 1987

Creator: Wormser, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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H/sup -/ formation process in a multicusp ion source

In recent years, H/sup -/ ions have been found important applications in high energy accelerators and in neutral beam heating of fusion plasmas. There are different techniques for producing the H/sup -/ or D/sup -/ ions. The most attractive scheme is the direct extraction of H/sup -/ ions from a hydrogen discharge. This technique requires no cesium and it utilizes the existing large area positive ion source technology. This paper investigates this techniques. 14 refs.

Date: July 1, 1987

Creator: Leung, K. N. & Kunkel, W. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Production of lepton pairs at the LBL Bevelac

We discuss the physics objectives for the DLS program with some emphasis on the possible use of dileptons as a probe of pion dynamics in nuclear matter. Data on p-Be reactions at 1-5 GeV and Ca-Ca at 1-2 A GeV are presented. The observation of a structure at about twice the pion mass in the e/sup +/e/sup /minus// invariant mass spectra above 2 GeV beam energy and the excitation function for the p-Be reaction suggest that pion annihilation is a significant dielectron source above 2 GeV. The diel… more

Date: June 1, 1989

Creator: Roche, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department