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in subjects: "Scatterplots"

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Spectroscopy of the UPSILON(2S) with the Crystal Ball

The Crystal Ball experiment has been taking data at the DORIS II storage ring at DESY/Hamburg on the UPSILON(2S) and UPSILON(1S) resonances since summer 1982. Results on the hadronic transitions between the UPSILON(2S) and the UPSILON(1S) are presented as well as measurements of the radiative decays of the UPSILON(2S) to the chi/sub b/ states in inclusive and exclusive channels. The exclusive UPSILON(2S) ..-->.. ..gamma..chi/sub b/ ..-->.. ..gamma gamma..UPSILON(1S) ..-->.. ..gamma gamma..l/sup… more

Date: April 1, 1985

Creator: Irion, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Preliminary spectrometer results from E-802

This report presents preliminary spectrometer results from the E-802 experiment at the Tandem-AGS accelerator complex at Brookhaven National Laboratory. The data presented were taken in late April of 1987 using a 14.5 GeV/c per nucleon /sup 28/Si beam from the AGS. Data were obtained for a variety of targets and spectrometer settings, but we present here the analysis of data for one target-angle combination: a Au target wth the spectrometer spanning 14/sup 0/ to 28/sup 0/ in the lab. At this en… more

Date: January 1, 1987

Creator: Miake, Y. & Stephans, G.S.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Summary of S = 0 dibaryon resonances and candidates

Experimental data concerning S = O dibaryon resonances are reviewed, with an emphasis on the nucleon-nucelon system. Structures observed in the ..gamma..d channel, the ..pi..d elastic scattering, pp ..-->.. ..pi..d channel, and other channels are discussed. Experimental data are compared with various theories. The short-range forces can be represented by dibaryon resonances. Further measurements to clarify the understanding of dibaryons are also discussed. 53 refs., 24 figs.

Date: April 18, 1985

Creator: Yokosawa, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Measurement of the decay UPSILON(2S). -->. pi. /sup 0/. pi. /sup 0/UPSILON(1S)

The hadronic transitions UPSILON(2S) ..-->.. ..pi../sup 0/..pi..UPSILON(1S) ..-->.. ..gamma gamma gamma gamma..l/sup +/l/sup -/ (l = ..mu.. or e) are investigated using the Crystal Ball detector. The analysis is based on 193,000 UPSILON(2S) events produced at the DORIS II e/sup +/e/sup -/ storage ring from November 1982 to February 1984. We observe 44 events with a muon pair and 46 events with an electron pair in the final state. The signals in both channels are relatively background free. Assu… more

Date: September 1, 1985

Creator: Gelphman, D.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Polarization phenomena in nucleon-nucleon scattering at intermediate and high energies including the present status of dibaryons

We review experimental results concerning polarization phenomena in nucleon-nucleon scattering in which both the elastic scattering and hadron-production reaction are included. We also present summary of S = 0 dibaryon resonances and candidates by reviewing experimental data in the nucleon-nucleon system, ..gamma..d channel, ..pi..d elastic scattering, pp ..-->.. ..pi..d channel, deuteron break-up reactions, and narrow structures in missing-mass spectra. 93 refs., 26 figs.

Date: January 1, 1985

Creator: Yokosawa, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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4. pi. physics. [/sup 40/Ar + KCl, 0. 4 to 1. 8 GeV/A]

Exclusive ..pi../sup -/ and charged-particle production in collisions of /sup 40/Ar on KCl are studied at incident energies from 0.4 to 1.8 GeV/A. The correlation between the ..pi../sup -/ and the total charged particle multiplicity confines the reaction along a narrow ridge with no exotic islands of pion production. For high multiplicities the system reaches the total disintegration of target and projectile into singly charged fragments and pions. Every 200 MeV/A datum was taken with a central… more

Date: March 1, 1980

Creator: Sandoval, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Glueballs of QCD and beyond

There are two methods discussed by which glueballs might be found. In the first, an OZI suppressed channel with variable mass is used, such as the reaction ..pi../sup -/p ..-->.. phi phi n. The breakdown of the OZI suppression is the glueball signal. The OZI suppression is a filter letting glueballs pass while strongly rejecting conventional hadronic states. The other method is to look in a channel enriched in gluons such as the radiative decay of the J/psi and search for new phenomena, such as… more

Date: January 1, 1984

Creator: Lindenbaum, S. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Search for rare muon and pion decay modes with the crystal box detector

New experiental upper limits for the branching ratios of the lepton-family-number nonconserving decays ..mu../sup +/ ..-->.. e/sup +/..gamma.. and ..mu../sup +/ ..-->.. e/sup +/..gamma gamma.. are presented. A new determination of ..gamma.., the ratio of pion axial vector to vector form factors, from radiative pion decay is also reported. These results are from data taken with the Crystal Box detector at LAMPF. 11 refs., 7 figs.

Date: January 1, 1986

Creator: Piilonen, L. E.; Bolton, R. D.; Bowman, J. D.; Cooper, M. D; Frank, J. S.; Hallin, A. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent results for Mark III

This paper presents recent results from the Mark III detector at SPEAR, in the open charm sector. The first topic discussed is the reanalysis of the direct measurement of the D hadronic branching fractions, where a detailed study has been made of the Cabibbo suppressed and multi-..pi../sup 0/'s D decays backgrounds in the double tag sample. Next, the Dalitz plot analysis of the D decays to K..pi pi.. is presented, leading to the relative fractions of three-body versus pseudoscalarvector decays.… more

Date: December 1, 1987

Creator: Brient, J.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Glueball resonance and alternative explanations of the reaction. pi. /sup -/p. -->. phi phi n*

The observation of three resonances (in the reaction ..pi../sup -/p ..-->.. phi phi n) which break down the OZI suppression was attributed to the production of these states by 1-3 glueball(s). The final partial wave analysis of approx. = 4000 phi phi n events was presented and agrees with prior publications within errors. Alternative explanations in terms of otherwise explaining the OZI suppression breakdown or finding other kinematic mechanisms to explain the BNL/CCNY data are discussed and fo… more

Date: January 1, 1985

Creator: Lindenbaum, S. J. & Longacre, R. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Recent results on D decays and lepton, photon, (and hadron) production of charm

After a brief introduction to the experiments with results included in this review, we will discuss, in turn, production of psi and psi', production of open charm in lepton and photon beams, D decays, and give a brief token mention of recent hadroproduction results. Emphasis will be on results reported since the Paris conference (August, 1982), but we will try to include all results since the last Lepton Photon Conference at Bonn (August, 1981) as well as earlier results when necessary for comp… more

Date: September 1, 1983

Creator: Nash, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Emission of complex fragments in compound nucleus decay

The compound nucleus mechanism for complex fragment emission is discussed theoretically and demonstrated experimentally. The role of the potential energy as a function of mass asymmetry is shown in experimental charge distributions. This process is followed from near the threshold up to bombarding energies of several tens of MeV A. 12 refs., 12 figs.

Date: April 1, 1986

Creator: Moretto, Luciano G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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New Results From the LASS (Large Aperture Superconducting Solenoid) Spectrometer

New results are presented from analyses of several mesonic and baryonic states containing one or more strange quarks. The data are taken from a high statistics (4 events/nb) study of K p interactions at 11 GeV/c carried out in the LASS Spectrometer at SLAC. New information is reported on the underlying K* states and also evidence for selective coupling of K eta to the K*'s; on the strangeonium members of the axial vector nonets in the K anti K channel; and on evidence for an * state.

Date: June 22, 1987

Creator: Aston, D.; Awaji, N.; Bienz, T.; Bird, F.; D'Amore, J.; Dunwoodie, W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The Argand amplitudes for the phi phi events from p yields phi phi n at 22 GeV/c

We obtained the Argand plots for the three phi phi I/sup G/J/sup PC/ = 0 2 amplitudes, which completely describe our 6658 events (after a 13% background subtraction) coming from the reaction p phi phi n at 22 GeV/c. The essential part of this determination is the partial wave analysis of the background reaction p phi K K n (1934 events).

Date: January 1, 1987

Creator: Longacre, R. S.; Etkin, A.; Foley, K. J.; Hackenburg, R. W.; Love, W. A.; Morris, T. W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Recent results on D meson decays from the MARK III

The MARK III Collaboration recently completed the analysis of a number of decay modes of charged and neutral D mesons produced in electron-positron collisions near the peak of the psi(3770) resonance at SLAC's SPEAR storage ring. The mesons were produced nearly at rest in pairs, either D/sup +/D/sup -/ or D/sup 0/ anti D/sup 0/, at a center-of-mass energy below the threshold for DD production. The unique kinematics of the production allow us to isolate the charmed meson signal clearly and unamb… more

Date: October 1, 1985

Creator: Coward, D. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Crystal Ball results on tau decays

This report reviews measurements and upper limit determinations for a number of exclusive 1-prong tau decay modes using the Crystal Ball detector. These results are important input to the apparent discrepancy between the topological and sum-of-exclusive branching fractions in 1-prong tau decays.

Date: October 1, 1987

Creator: Lowe, S.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Entrance Channel Limitations in the High Energy Fusion of Light-Heavy Systems Leading to /sup 40/Ca and /sup 42/Ca

The question of compound nucleus or entrance channel-type limitation to the fusion cross section has been approached effectively in experiments where the same compound nucleus is populated by different projectile-target combinations. Fusion data are available for several systems leading to the compound nuclei /sup 40/Ca and /sup 42/Ca. In this study we report on measurements of fusion cross sections done on /sup 28/Si + /sup 12/C and /sup 30/Si + /sup 2/C over a wide range of bombarding energie… more

Date: January 1, 1986

Creator: Harmon, B. A.; Shapira, D.; Stelson, P. H.; Burks, B. L.; Erb, K. A.; Shivakumar, B. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High nuclear temperatures by antimatter-matter annihilation

It is suggested that the quark-gluon phase be created through the use of antiproton or antideuteron beams. The first advantage to this method, using higher energy antiprotons than 1.5 GeV/c, is that the higher momenta antiprotons penetrate more deeply so that mesons produced are more nearly contained within the nucleus. Another advantage is that the annihilation products are very forward-peaked and tend to form a beam of mesons so that the energy density does not disperse very rapidly. Calculat… more

Date: January 1, 1985

Creator: Gibbs, W.R. & Strottman, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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rho/sup 0/. omega. production in photon photon interactions

The subject of this dissertation is the production of the rho/sup 0/..omega.. final state in photon photon interactions. The production of the rho/sup 0/..omega.. final state has been of interest primarily because of its similarity to the related process ..gamma gamma.. ..-->.. rho/sup 0/rho/sup 0/. The cross section for rho/sup 0/rho/sup 0/ production demonstrates a peaking near threshold, the mechanism of which has been the subject of considerable speculation. The data sample used for the ana… more

Date: August 1, 1987

Creator: Derby, K.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Search for primarily non-interacting decay modes of the upsilon

The hadronic transition UPSILON(2S) ..-->.. ..pi../sup 0/..pi../sup 0/UPSILON(1S) is utilized to search for the reactions: UPSILON(1S) ..-->.. non-interacting particles and UPSILON(1S) ..-->.. ..gamma.. + non-interacting particles. 44 pb/sup -1/ of UPSILON(2S) data were taken by the Crystal Ball detector at the DORIS II storage ring in order to perform this study. An upper limit of BR(UPSILON ..-->.. Unseen) < 12% (90% C.L.), is obtained via this approach. The second process investigated involv… more

Date: March 1, 1986

Creator: Leffler, J.S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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New results for rare muon decays

Branching-ratio limits obtained with the Crystal Box detector are presented for the rare muon decays ..mu.. ..-->.. eee, ..mu.. ..-->.. e..gamma.., and ..mu.. ..-->.. e..gamma gamma... These decays, which violate the conservation of separate lepton-family numbers, are expected to occur in many extensions to the standard model. We found no candidates for the decay ..mu.. ..-->.. eee, yielding an upper limit for the branching ratio of B/sub ..mu..3e/ < 3.1 x 10/sup -11/ (90% C.L.). A maximum-like… more

Date: January 1, 1986

Creator: Mischke, R. E.; Bolton, R. D.; Bowman, J. D.; Cooper, M. D.; Frank, J. S.; Hallin, A. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Study of hadronization using energy flow from e/sup +/e/sup -/ annihilation into quarks and gluons at. sqrt. s of 29 GeV

We have made a high statistics study of QCD jets produced in e/sup +/e/sup -/ annihilations at ..sqrt..s of 29 GeV and observed in the MAC detector located at the PEP storage ring at SLAC. The MAC detector uses calorimetry and provides a homogeneous response over much of its 98% . 4..pi.. sr instrumented solid angle. A data sample of well reconstructed hadronic events was selected by requiring that E/sub vis/ in the calorimeters be near ..sqrt..s, and almost all the energy be deposited in the c… more

Date: November 1, 1985

Creator: Rosenberg, L. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Increased statistics in. pi. /sup -/p. -->. phi phi n and the status of glueball production

The statistics for the OZI forbidden reaction ..pi../sup -/p ..-->.. phi phi n have been doubled to a total of 6658 events, allowing extension of the phi phi partial wave analysis. A three-pole K-matrix fit was also obtained and Breit Wigners parameters deduced. Mass spectra, amplitudes from the partial wave analysis, and Argand diagrams for each wave are given. (LEW)

Date: January 1, 1987

Creator: Lindenbaum, S. J.; Etkin, A.; Foley, K. J.; Hackenburg, R. W.; Longacre, R. S.; Love, W. A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Status and first results of Brookhaven Experiment 780: A search for K/sub L//sup 0/. -->. mu + e and K/sub L//sup 0/. -->. e + e

We report on the progress of a search for the rare decays K/sub L//sup 0/ ..-->.. ..mu.. + e and K/sub L//sup 0/ ..-->.. e + e underway at the Brookhaven National Laboratory AGS. Analysis of data collected in February and May of 1987 yields the preliminary limit: BR(K/sub L//sup 0/ ..-->.. ..mu.. + e), BR(K/sub L//sup 0/ ..-->.. e + e) < 7 x 10/sup -9/. Prospects are discussed for the running period scheduled to begin in January of 1988.

Date: October 1, 1987

Creator: Greenlee, H.B.; Kasha, H.; Mannelli, E.; Mannelli, M.; Schaffner, S.; Schmidt, M.P. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department