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1. X-ray Reflection

Author

R. R. Ross and A. C. Fabian

Subjects
Physics, X-ray astronomy, business.industry, Astrophysics::High Energy Astrophysical Phenomena, X-ray, Astronomy and Astrophysics, Plasma, Radiation, Accretion (astrophysics), Neutron star, Optics, Space and Planetary Science, Irradiation, business, Electron scattering
Abstract

Material irradiated by X-rays produces backscattered radiation which is commonly known as the Reflection Spectrum. It consists of a structured continuum, due at high energies to the competition between photoelectric absorption and electron scattering enhanced at low energies by emission from the material itself, together with a complex line spectrum. We briefly review the history of X-ray reflection in astronomy and discuss various methods for computing the reflection spectrum from cold and ionized gas, illustrated with results from our own work reflionx. We discuss how the reflection spectrum can be used to obtain the geometry of the accretion flow, particularly the inner regions around black holes and neutron stars.

Published
2010

2. Exclusion limits on the WIMP-nucleon scattering cross-section from the Cryogenic Dark Matter Search

Author

P. Shestople, Tarek Saab, P. L. Brink, R. R. Ross, S. Eichblatt, R. Abusaidi, J. Hellmig, Peter D. Barnes, A. K. Davies, Alexander Bolozdynya, R. M. Clarke, Alan R. Smith, Bernard Sadoulet, J. P. Castle, John M. Martinis, M. Crisler, A. Da Silva, Sae Woo Nam, F. P. Lipschultz, T. A. Shutt, A. H. Sonnenschein, Betty A. Young, J D Nelson, Thushara Perera, R. J. Gaitskell, S. J. Yellin, D. A. Bauer, J. Jochum, R. L. Dixon, Blas Cabrera, Sunil Golwala, R. W. Schnee, D. S. Akerib, B. Neuhauser, P. Colling, Kent D. Irwin, Martin E. Huber, M. C. Perillo Isaac, D. O. Caldwell, A. L. Spadafora, and E. E. Haller

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Scattering, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear physics, WIMP, Ionization, Weakly interacting massive particles, High Energy Physics::Experiment, Cryogenic Dark Matter Search, Nucleon, Instrumentation, Light dark matter
Abstract

The Cryogenic Dark Matter Search (CDMS) employs massive ionization- and phonon-mediated detectors to search for WIMPs via their elastic scattering interactions with nuclei while discriminating against interactions by other background particles. Limits on the WIMP-nucleon scattering cross-section, based on 3.1 kg d of exposure, exclude new parameter space in the 10–30 GeV WIMP mass region and also a portion of the region allowed by the DAMA annual modulation search (Bernabei, Phys. Lett. 450 (1999) 448).

Published
2000

3. Further results from the CDMS experiment

Author

D. D. Driscoll, P. Cushman, M. C. Perillo Isaac, P. Meunier, N. Mirabolfathi, R. W. Ogburn, L. Duong, C. Savage, Laura Baudis, C. L. Chang, Martin E. Huber, M. B. Crisler, Bernard Sadoulet, J. P. F. Thompson, R. R. Ross, A. Lu, Vuk Mandic, R. J. Gaitskell, M. S. Armel, S. Kamat, M. J. Attisha, R. Bunker, G. Wang, R. L. Dixon, H. N. Nelson, Blas Cabrera, R. W. Schnee, R. Mahapatra, D. O. Caldwell, John M. Martinis, D. S. Akerib, D. A. Bauer, Betty A. Young, P. L. Brink, A. Reisetter, W. Rau, J. Sander, Tarek Saab, and S. J. Yellin

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Cold dark matter, Physics::Instrumentation and Detectors, Astrophysics::Instrumentation and Methods for Astrophysics, Fermion, Particle detector, Nuclear physics, WIMP, Ionization, Weakly interacting massive particles, High Energy Physics::Experiment, Neutron, Cryogenic Dark Matter Search, Instrumentation
Abstract

The Cryogenic Dark Matter Search experiment utilizes discriminating detectors where both the recoil energy and ionization produced by each particle event are simultaneously measured. Here we present our latest results from operating 4 Ge (4×250 g) and 2 Si (2×100 g) detectors at the shallow Stanford site. Our new WIMP exclusion limit excludes new parameter space for low-mass WIMPS.

Published
2004

4. Evidence for spin-one resonance production in the reaction γγ*→π+π−π0π0

Author

G. Godfrey, N. A. Nicol, J. M. Hauptman, R. W. Stephens, A. Lu, B. C. Shen, Y. X. Wang, S. Khacheryan, J. Y. Oyang, W. T. Lin, A. R. Clark, G. R. Lynch, S. J. Yellin, R. R. Ross, R. J. Madaras, C. D. Buchanan, D. J. Lambert, D. R. Nygren, Werner Hofmann, J. J. Eastman, A. P.T. Palounek, H. Yamamoto, David O. Caldwell, M. K. Sullivan, J. Lys, G. Zapalac, E. M. Wang, S. B. Chun, G. S. Greenbaum, R. L. Holtzapple, H. H. Bingham, K. T. Knöpfle, David E. Pellett, Michael A. Strauss, W. Vernon, R. C. Berg, C. Zeitlin, George P Yost, H. P. Paar, M. Daoudi, E. S. Miller, R. Belcinski, G. E. Masek, W.A. Wenzel, Gilbert Shapiro, M. L. Stevenson, M. T. Ronan, K. H. Fairfield, S. C. Loken, A. M. Eisner, D. A. Bauer, R. R. Kofler, Orin I. Dahl, and J. G. Layter

Subjects
Physics, Nuclear physics, Massless particle, Pion, Meson, Branching fraction, Isospin, Hadron, Elementary particle, Atomic physics, Boson
Abstract

Using data from the TPC/Two-Gamma experiment at the SLAC [ital e][sup +][ital e[minus]] storage ring PEP, a [ital C]=+1 resonance has been observed in the [pi][sup +][pi][sup [minus]][pi][sup 0][gamma] final state resulting from the fusion of one nearly real and one quite virtual photon. The actual decay channel is probably [pi][sup +][pi][sup [minus]][pi][sup 0][pi][sup 0], where one final-state photon is not detected, and the mass of the fully reconstructed state would be approximately 1525 MeV. A four-pion decay mode in turn implies that the resonance has even isospin. The nonobservation of this [ital R](1525) when both initial-state photons are nearly real suggests a spin-1 assignment. Since the large measured value of the product of the branching ratio into [pi][sup +][pi][sup [minus]][pi][sup 0][pi][sup 0] and the [gamma][gamma] coupling makes it unlikely that this state is the mostly [ital [bar s]s] [ital f][sub 1](1510), its interpretation may lie outside of conventional meson spectroscopy. There is a second, less-significant enhancement observed in the same reaction at a four-pion mass centered around 2020 MeV.

Published
1993

6. First CDMS II WIMP Search Results from the Soudan Underground Laboratory

Author

R. W. Ogburn, R. Bunker, A. Reisetter, Betty A. Young, W. Rau, K. M. Sundqvist, H. Nelson, G. Wang, P. L. Brink, M. J. Attisha, V. Mandic, R. Mahapatra, D. A. Bauer, N. Mirabolfathi, P. Meunier, B. Serfass, David O. Caldwell, A. J. Sirois, D. N. Seitz, Donald J. Holmgren, A. Lu, M. R. Dragowsky, J. Sander, J. P. F. Thompson, M. S. Armel-Funkhouser, R. R. Ross, C. Savage, Blas Cabrera, S. Kamat, R. Ferril, R. J. Gaitskell, E. J. Ramberg, M. B. Crisler, Bernard Sadoulet, C. L. Chang, R. Nelson, Tarek Saab, Thushara Perera, S. J. Yellin, D. S. Akerib, Jeffrey P. Filippini, L. Duong, M. E. Huber, Laura Baudis, D. D. Driscoll, P. Cushman, R. L. Dixon, and R. W. Schnee

Subjects
Physics, Particle physics, WIMP, Dark matter, Underground laboratory, Cryogenic Dark Matter Search
Abstract

D.S. Akerib, M.S. Armel-Funkhouser, M.J. Attisha, L. Baudis, D.A. Bauer, P.L. Brink, R. Bunker, B. Cabrera, D.O. Caldwell, C.L. Chang, M.B. Crisler, P. Cushman, R. Dixon, M.R. Dragowsky, D.D. Driscoll, L. Duong, R. Ferril, J. Filippini, R.J. Gaitskell, D. Holmgren, M.E. Huber, S. Kamat, A. Lu, R. Mahapatra, V. Mandic, P. Meunier, N. Mirabolfathi, H. Nelson, R. Nelson, R.W. Ogburn, T.A. Perera, E. Ramberg, W. Rau, A. Reisetter, R.R. Ross, T. Saab, B. Sadoulet, J. Sander, C. Savage, R.W. Schnee, D.N. Seitz, B. Serfass, A.J. Sirois, K.M. Sundqvist, J-P.F. Thompson, G. Wang, S. Yellin, and B.A. Young

Published
2006

7. The ionization structure of iron in AGN

Author

I. M. George, A. C. Fabian, and R. R. Ross

Subjects
Physics, Black hole, Accretion rate, Accretion disc, Ionization, Astrophysics, Equivalent width
Published
2005

8. The multicolour disc model parameter for black hole candidates: Can we trust the inner disc measurements?

Author

A. C. Fabian, A. Merloni, and R. R. Ross

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, X-ray binary, Astrophysics, Radius, Black hole, Intermediate-mass black hole, Extremal black hole, Astrophysics::Solar and Stellar Astrophysics, Stellar black hole, Astrophysics::Earth and Planetary Astrophysics, Spin-flip, Astrophysics::Galaxy Astrophysics, Gravitational redshift
Abstract

We present a critical analysis of the usual interpretation of the multicolour disc model parameters for black hole candidates in terms of the inner radius and temperature of the accretion disc. Using a self-consistent model for the radiative transfer and the vertical temperature structure in a Shakura-Sunyaev disc, we simulate the observed spectra, taking into account doppler blurring and gravitational redshift, and fit them with multicolour models. We show not only that such a model systematically underestimates the value of the inner disc radius, but that when the accretion rate and/or the energy dissipated in the corona are allowed to change the inner edge of the disc, as inferred from the multicolour model, appears to move even when it is in fact fixed at the innermost stable orbit.

Published
2001

9. Recent Results from the Cryogenic Dark Matter Search for Weakly Interacting Massive Particles

Author

J. D. Taylor, F. P. Lipschultz, S. Eichblatt, M. J. Penn, M. B. Crisler, A. R. Smith, P. Shestople, R. Bunker, Sunil Golwala, Betty A. Young, Thushara Perera, B. Pritychenko, S. J. Yellin, D. O. Caldwell, R. L. Dixon, John M. Martinis, A. Lu, A. Da Silva, Tarek Saab, M. E. Huber, D. S. Akerib, Alexander Bolozdynya, D. N. Seitz, Daniel E. Hale, R. Abusaidi, Kent D. Irwin, M. C. Perillo Isaac, J. Emes, Blas Cabrera, A. H. Sonnenschein, Simon D. M. White, A. Cummings, P. D. Barnes, P. L. Brink, J. Jochum, R. R. Ross, Bernard Sadoulet, R. M. Clarke, T. A. Shutt, A. L. Spadafora, V. Mandic, D. A. Bauer, W. Stockwell, J. P. Castle, Sae Woo Nam, R. J. Gaitskell, B. L. Dougherty, G. W. Smith, H. N. Nelson, J. Hellmig, R. W. Schnee, B. Neuhauser, D. D. Driscoll, P. Colling, A. K. Davies, and E. E. Haller

Subjects
Physics, Particle physics, WIMP, Weakly interacting massive particles, Hot dark matter, Dark matter, Warm dark matter, Strongly interacting massive particle, Cryogenic Dark Matter Search, Light dark matter
Abstract

In September 1999, the Cryogenic Dark Matter Search (CDMS) completed a nine month run with the first generation detectors (0.5 kg of germanium BLIPs sensing thermal phonons and ionization). The data acquired in this run significantly decrease the upper limits on WIMP interaction in germanium by a factor 2.5 to 10 depending on the mass region and begin to probe supersymmetry. The results are however strongly inconsistent with the claims of the DAMA experiment.

Published
2001

10. Results of the Cryogenic Dark Matter Search

Author

R. M. Clarke, D. A. Bauer, M. B. Crisler, E. E. Haller, R. Bunker, P. D. BarnesJr., P. Shestople, P. L. Brink, R. L. Dixon, A. L. Spadafora, Boris Pritychenko, Blas Cabrera, G. Smith, R. W. Schnee, D. D. Driscoll, A. Lu, A. K. Davies, A. Da Silva, Vuk Mandic, B. L. Dougherty, J. P. Castle, Kent D. Irwin, R. R. Ross, Simon D. M. White, Martin E. Huber, A. C. Cummings, T. A. Shutt, H. N. Nelson, Bernard Sadoulet, J. Emes, A. H. Sonnenschein, B. Neuhauser, M. C. Perillo Isaac, P. Colling, D. O. Caldwell, A. R. Smith, W. Stockwell, Betty A. Young, J. Hellmig, John M. Martinis, R. J. Gaitskell, Alexander Bolozdynya, Thushara Perera, S. J. Yellin, J. Jochum, Tarek Saab, D. N. Seitz, Sae Woo Nam, Sunil Golwala, D. S. Akerib, Daniel E. Hale, R. Abusaidi, J. D. Taylor, F. P. Lipschultz, M. J. Penn, and S. Eichblatt

Subjects
Physics, Physics::Instrumentation and Detectors, Dark matter, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Parameter space, Nuclear physics, Cross section (physics), WIMP, Weakly interacting massive particles, Mixed dark matter, High Energy Physics::Experiment, Neutron, Cryogenic Dark Matter Search
Abstract

The Cryogenic Dark Matter Search (CDMS) employs Ge and Si detectors to search for weakly interacting massive particles (WIMPs) via their elastic-scattering interactions with nuclei while discriminating against interactions of background particles. CDMS data, accounting for the neutron background, give limits on the spin-independent WIMP-nucleon elastic-scattering cross section that exclude unexplored parameter space above 10 GeV c-2 WIMP mass and. at > 75% CL. the entire 3σ allowed region for the WIMP signal reported by the DAMA experiment.

Published
2001

11. X-ray spectra including reflection off matter within the innermost stable orbit

Author

A. C. Fabian, R. R. Ross, and A. J. Young

Subjects
Physics, General Relativity and Quantum Cosmology, Absorption edge, Rotating black hole, Astrophysics::High Energy Astrophysical Phenomena, Schwarzschild metric, Astrophysics, Spin-flip, Polarization (waves), Light curve, Schwarzschild radius, Redshift
Abstract

Recently Reynolds & Begelman [1] have proposed a model in which the broad and highly redshifted iron line seen during a flux minimum of the light curve of MCG–6‐30‐15 may be explained by accretion onto a Schwarzschild black hole rather than a rapidly spinning Kerr black hole [2,3]. In their model they only consider the iron line in the reflected continuum, ignoring the absorption edge that will be present with reflection off ionized matter. We calculate in detail the X-ray spectrum expected from such a model and find that it should possess an absorption edge which is inconsistent with the data. We may, however, obtain a good fit to the iron line if the source undergoes a number of specific changes during the flux minimum which are difficult to justify. We conclude that the data on MCG–6‐30‐15 are more consistent with the Kerr over the Schwarzschild model.

Published
1998

12. The Cryogenic Dark Matter Search (CDMS)

Author

R. R. Ross, Thushara Perera, J. D. Taylor, S. J. Yellin, P. D. Barnes, M. J. Penn, A. R. Smith, Betty A. Young, P. L. Brink, David O. Caldwell, A. Sonnenschein, R. Therrien, William B. Knowlton, Simon D. M. White, B. L. Dougherty, Sae Woo Nam, Bernard Sadoulet, D. A. Bauer, D. Hale, E. E. Haller, A. DaSilva, Kent D. Irwin, D. N. Seitz, J. Emes, G. W. Smith, W. Stockwell, R. M. Clarke, R. J. Gaitskell, Blas Cabrera, Sunil Golwala, D. S. Akerib, B. Chugg, T. A. Shutt, A. K. Davies, and R. W. Schnee

Subjects
Galactic halo, Physics, Scattering, Weakly interacting massive particles, Dark matter, Astrophysics::Cosmology and Extragalactic Astrophysics, Halo, Supersymmetry, Cryogenic Dark Matter Search, Astrophysics, Nucleon, Astrophysics::Galaxy Astrophysics
Abstract

Despite the discovery of MACHO dark matter in our galactic halo, much of the inferred halo mass seems still to be missing [1]. If we assume that this missing mass is in the form of the weakly interacting massive particles (WIMPs) predicted by supersymmetry [2], then we expect to find a flux of 107/mx cm-2 in the solar neighborhood or 104-106 cm-2 assuming the most likely mass range mx ∽ 10 - 1000 GeV and standard models of the galactic halo. These WIMPs have a total cross section for scattering on a nucleon of no more than 10-41cm2, leading to total scattering rates below 0.1 kg-1 day-1 of target mass.

Published
1997

13. Provider-assisted suicide: a survey of PA attitudes. Results of the 1994 Michigan survey conducted by the Michigan Academy of Physician Assistants Public Policy Committee

Author

R J, Hayden, M A, Salley, J, Brasseur, J R, Kircher, and R R, Ross

Subjects
Michigan, Physician Assistants, Attitude of Health Personnel, Euthanasia, Surveys and Questionnaires, Humans, Public Policy, Societies, Medical, Suicide, Assisted
Abstract

Assisted suicide continues to be a topic of debate among health care providers, including PAs. The Public Policy Committee of the Michigan Academy of Physician Assistants surveyed all licensed PAs in Michigan regarding assisted suicide in an effort to determine whether a public policy statement should be developed, and whether that could be extrapolated into a resolution to be taken to the House of Delegates (HOD) of the American Academy of Physician Assistants in 1994. Based on the divergent results of the survey, the Michigan delegation did not submit a resolution to the HOD.

Published
1995

14. Present status of the Cryogenic Dark Matter Search (CDMS II) experiment

Author

J. P. Castle, J. Hellmig, Laura Baudis, R. Bunker, A. Lu, John M. Martinis, D. O. Caldwell, W. Rau, D. A. Bauer, R. Dixon, Tarek Saab, J. Emes, R. J. Gaitskell, P. Meunier, S. Kamat, G. Wang, T. A. Shutt, Vuk Mandic, P. L. Brink, J. Sander, R. W. Schnee, D. D. Driscoll, M.B. Crisler, D. Holmgren, Martin E. Huber, Alan R. Smith, H. N. Nelson, Blas Cabrera, D. S. Akerib, G. Smith, David S. Abrams, D. N. Seitz, A. L. Spadafora, R. R. Ross, Betty A. Young, Bernard Sadoulet, Thushara Perera, S. J. Yellin, M. S. Armel-Funkhouser, M. C. Perillo Isaac, and C. Chang

Subjects
Physics, Particle physics, media_common.quotation_subject, Dark matter, Condensed Matter Physics, Particle detector, Particle identification, Universe, Electronic, Optical and Magnetic Materials, Semiconductor detector, Nuclear physics, WIMP, Weakly interacting massive particles, Cryogenic Dark Matter Search, Electrical and Electronic Engineering, media_common
Abstract

The CDMS experiment utilizes Ge and Si detectors operating at 20 mK to search for the Dark Matter of the Universe hypothesized to exist in the form of weakly interacting massive particles (WIMPs). In early 2000, CDMS set the most competitive exclusion limit for scalar-interaction WIMPs in the Stanford Underground Facility (SUF). A new search (CDMS II) is now commencing with several improvements: a deep-site facility in the Soudan mine, Minnesota; and the detector technology has been further improved to aid in the rejection of surface-electron (β) events. A new generation of detectors, sensitive to the initial athermal phonon flux from a particle event, have been in operation for the past year at Stanford's shallow site and are ready for installation at the deep site.

Published
2003

15. Measurement of the kaon content of three-prong tau decays

Author

M. K. Sullivan, H. Yamamoto, S. J. Yellin, D. E. Pellett, Y. X. Wang, J. Lys, G. S. Greenbaum, R. L. Holtzapple, G. Zapalac, E. M. Wang, H. H. Bingham, George P Yost, S. C. Loken, S. Khacheryan, R. R. Ross, D. O. Caldwell, G. R. Lynch, A. Lu, D. R. Nygren, R. J. Madaras, G. Godfrey, W.A. Wenzel, Gilbert Shapiro, A. M. Eisner, M. L. Stevenson, K. T. Knöpfle, E. S. Miller, R. C. Berg, Werner Hofmann, J. M. Hauptman, R. R. Kofler, Philippe Eberhard, D. J. Lambert, H. P. Paar, Y. T. Oyang, Orin I. Dahl, M. T. Ronan, K. H. Fairfield, H. Marsiske, C. D. Buchanan, W. Vernon, N. A. Nicol, A. P.T. Palounek, R. Belcinski, M. G. Strauss, S. B. Chun, E.E. Bloom, A. R. Clark, D.A. Bauer, J. J. Eastman, G. E. Masek, and R. W. Stephens

Subjects
Combinatorics, Physics, Systematic error, Particle physics, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, TheoryofComputation_GENERAL, MathematicsofComputing_DISCRETEMATHEMATICS
Abstract

We present branching fraction measurements of three-prong decays of the [tau][sup [minus]] lepton based on data from the TPC/Two-Gamma detector at SLAC PEP. The decays are classified according to the identities of the charged tracks to give simultaneous measurements of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][pi][sup +][pi][sup [minus]]]=0.58[sub [minus]0.13][sup +0.15]% and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][ital K][sup +][pi][sup [minus]]]=0.15[sub [minus]0.07][sup +0.09]%, and upper limits of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]][pi][sup [minus]][ital K][sup +][pi][sup [minus]]][lt]0.25%, [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][pi][sup +][ital K][sup [minus]]][lt]0.09%, and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][ital K][sup +][ital K][sup [minus]]][lt]0.21%, where additional neutrals may be present in each case. The branching fractions are normalized to the world average three-prong topological branching fraction and there is an estimated 20% systematic error in addition to the listed statistical errors. We find the mass distributions in the [ital K][sup [minus]][pi][sup +][pi][sup [minus]] decay are consistent with [ital K][sub 1] dominance, and obtain branching fractions of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sub 1][sup [minus]](1270)]=0.41[sub [minus]0.35][sup +0.41]% and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sub 1][sup [minus]](1400)]=0.76[sub [minus]0.33][sup +0.40]%.

Published
1994

18. Inclusive D*+- production in photon-photon collisions

Author

G. Shapiro, L. G. Mathis, S. Yellin, J. J. Eastman, T. K. Edberg, S. K. Park, S. Khacheryan, S. Toutounchi, P. J. Oddone, R. W. Stephens, J. S. Steinman, W. Vernon, A. Bay, G. Zapalac, W. T. Lin, C. Zeitlin, Margaret Alston-Garnjost, D. A. Crane, B. C. Shen, G. Masek, R. R. Ross, K. H. Fairfield, H. P. Paar, A. Lu, Elliott D. Bloom, R. R. Kofler, Y. T. Oyang, S. B. Chun, R. J. Madaras, G. Lynch, M. L. Stevenson, D. H. Stork, J. Lys, J. G. Layter, D. A. Bauer, R. E. Avery, K. T. Knopfle, H. Marsiske, S. C. Loken, M. T. Roman, H. Yamamoto, J. M. Hauptman, E. M. Wang, Orin I. Dahl, P. H. Eberhard, E. S. Miller, G. Godfrey, D. R. Nygren, Werner Hofmann, N. A. Nicol, F. C. Erné, H. Y. Chao, F.L. Linde, M. Pripstein, Allan G Clark, George P Yost, A. Buijs, C. D. Buchanan, M. Daoudi, M. G. Strauss, R. Belcinski, H. H. Bingham, A. R. Barker, D. E. Pellett, D. J. Lambert, W. A. Wenzel, Y. X. Wang, M. K. Sullivan, Willem G. J. Langeveld, R. W. Kenney, A. M. Eisner, A. P.T. Palounek, J. C. Sens, D. O. Caldwell, and IHEF (IoP, FNWI)

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Photon, Meson, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Parton, Hadronization, Nuclear physics, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment
Abstract

The TPC/Two-Gamma Collaboration has measured the inclusive cross section for production of charmed D∗± mesons in photon-photon collisions. The reaction utilized was e+e-→e+e-D∗±X, with D∗±→DOπ+-, DO→K-+π ±, and either zero or one outgoing e± detected. The result, σ(e + e - → e + e - D ∗± X) = 74±26±19 pb , is in agreement with the quark parton mo del prediction for e+e- → e+e-c c , combined with a Lund model for the hadronization of the charmed quarks.

Published
1990

19. A cryogenic phonon detector with simultaneous measurement of phonons and ionization

Author

P. Barnes, N.W. Wang, Christopher W. Stubbs, Y. Giraud-Héraud, T. Shutt, Eugene E. Haller, R. R. Ross, J. Rich, Bernard Sadoulet, Andrew E. Lange, A. Cummings, and J. Emes

Subjects
Physics, Phonon, Dark matter, Detector, Particle interaction, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Condensed Matter Physics, Galaxy, Electronic, Optical and Magnetic Materials, Crystal, Nuclear physics, Condensed Matter::Superconductivity, Ionization, Halo, Electrical and Electronic Engineering
Abstract

One way to detect dark matter particles from the halo of our galaxy is to detect phonons generated by dark matter particle interaction in a crystal. We report on our efforts to develop a phonon detector operating at 20 mK. We present our recent results on the simultaneous measurement of phonons and ionization, which may provide an effective way to reject background in dark matter search.

Published
1990

20. Exclusive Production ofK+K−π+π−in Photon-Photon Collisions

Author

H. Aihara, M. Alston-Garnjost, J. C. Armitage, J. A. Bakken, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, H. -U. Bengtsson, D. L. Bintinger, B. J. Blumenfeld, G. J. Bobbink, A. D. Bross, C. D. Buchanan, A. Buijs, M. P. Cain, D. O. Caldwell, O. Chamberlain, C. -Y. Chien, A. R. Clark, A. Cordier, O. I. Dahl, C. T. Day, K. A. Derby, M. A. van Driel, P. H. Eberhard, A. M. Eisner, F. C. Erne, D. L. Fancher, H. Fujii, T. Fujii, B. Gabioud, J. W. Gary, W. Gorn, N. J. Hadley, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, U. P. Joshi, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X. -Q. Lu, G. R. Lynch, L. Madansky, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, K. Maruyama, G. E. Masek, J. A. J. Matthews, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Palmer, D. A. Park, D. E. Pellett, A. Pevsner, M. Pripstein, P. R. Robrish, M. T. Ronan, R. R. Ross, F. R. Rouse, R. R. Sauerwein, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, M. L. Stevenson, D. H. Stork, M. K. Sullivan, J. R. Thompson, H. K. Ticho, J. Timmer, N. Toge, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, H. Yamamoto, M. Yamauchi, S. J. Yellin, and W. -M. Zhang

Subjects
Physics, Nuclear physics, Pair production, Pion, Annihilation, Meson, Branching fraction, Hadron, Mass spectrum, General Physics and Astronomy, Particle identification
Abstract

We report a measurement of the reaction ..gamma gamma -->..K/sup +/K/sup -/..pi../sup +/..pi../sup -/ in both tagged and untagged events at PEP. The cross section rises with invariant ..gamma gamma.. mass to about 15 nb at 2 GeV and falls slowly at higher masses. We find clear evidence for the processes ..gamma gamma -->..phi..pi../sup +/..pi../sup -/ and ..gamma gamma -->..K/sup asterisk0/(892)K..pi... Upper limits (95% C.L.) of 1.5 and 5.7 nb in the mass range from 1.7 to 3.7 GeV are obtained for phirho/sup 0/ and K/sup asterisk0/K/sup asterisk0/ production, respectively.

Published
1985

21. K*0andKS0Meson Production ine+e−Annihilations at 29 GeV

Author

J. M. Hauptman, A. Barbaro-Galtieri, B. Gabioud, B. C. Shen, L. Madansky, W.A. Wenzel, J. E. Huth, J. Hylen, H. Yamamoto, W. Moses, C. S. Lindsey, Gilbert Shapiro, R. I. Koda, M. L. Stevenson, S. C. Loken, T. Kamae, G. J. VanDalen, K. A. Derby, W. M. Zhang, F. R. Rouse, Q. Chamberlain, A. Cordier, A. Pevsner, Hirotsugu Fujii, D. A. Park, R. R. Kofler, Peter Nemethy, Philippe Eberhard, G. R. Lynch, Toshitsugu Fujii, N. Toge, Marjorie Shapiro, Orin I. Dahl, R. F. van Daalen Wetters, C. Y. Chien, Nicholas John Hadley, M. T. Ronan, E. M. Wang, M. Yamauchi, Hiroaki Aihara, Werner Hofmann, B. A. Barnett, L. T. Kerth, J. W. Gary, K. K. Kwong, Margaret Alston-Garnjost, R. van Tyen, A. D. Bross, W. E. Slater, Mitchell Wayne, A. R. Clark, A. V. Barnes, D. L. Fancher, D. H. Stork, P. J. Oddone, R. R. Sauerwein, J. G. Layter, K. Maruyama, R. R. Ross, H. K. Ticho, R. J. Madaras, J. A. Bakken, W. Gorn, H. S. Kaye, Barry Blumenfeld, C. D. Buchanan, C. T. Day, P. R. Robrish, J. N. Marx, X. Q. Lu, D. R. Nygren, J. A. J. Matthews, M. Pripstein, S. O. Melnikoff, and R. W. Kenney

Subjects
Nuclear physics, Physics, Particle physics, Antiparticle, Annihilation, Pion, Meson, Antimatter, Electron–positron annihilation, Hadron, General Physics and Astronomy, Elementary particle
Abstract

The inclusive production cross sections and transverse momentum distributions of ${K}^{*0}$ and ${{K}_{S}}^{0}$ mesons in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at a center-of-mass energy of 29 GeV have been measured by means of the time projection chamber detector in the PEP-4 experiment. The mean multiplicites are found to be 0.49 \ifmmode\pm\else\textpm\fi{} 0.04(stat.) \ifmmode\pm\else\textpm\fi{} 0.07(syst.) (${K}^{*0}+{\stackrel{-}{K}}^{*0}$) and 1.22 \ifmmode\pm\else\textpm\fi{} 0.03(stat.) \ifmmode\pm\else\textpm\fi{}0.15(syst.) (${K}^{0}+{\stackrel{-}{K}}^{0}$) per event.

Published
1984

22. Prompt muon production ine+e−annihilations at 29 GeV

Author

R. I. Koda, C. T. Day, J. E. Huth, D. R. Nygren, P. J. Oddone, M. Pripstein, H. U. Bengtsson, A. Cordier, D. H. Stork, B. Gabioud, J. A. Bakken, Hiroaki Aihara, A. Pevsner, G. R. Lynch, C. S. Lindsey, K. A. Derby, H. Yamamoto, B. A. Barnett, D. A. Park, L. T. Kerth, R. R. Sauerwein, R. R. Ross, Tuneyoshi Kamae, J. W. Gary, M. Yamauchi, P. R. Robrish, W. E. Slater, D. H. Badtke, O. Chamberlain, R. J. Madaras, J. N. Marx, Em Wang, B. C. Shen, A. Barbaro-Galtieri, W. Moses, F. R. Rouse, W. M. Zhang, Peter Nemethy, O. I. Dahl, L. Madansky, R. F. van Daalen Wetters, M. Alston-Garnjost, J. Hylen, R. W. Kenney, H. K. Ticho, A. R. Clark, X. Q. Lu, W. A. Wenzel, Hirotsugu Fujii, A. V. Barnes, N. Toge, A. D. Bross, M. T. Ronan, J. G. Layter, M. R. Wayne, G. J. Vandalen, W. Gorn, W. Hofmann, S. O. Melnikoff, C. Y. Chien, M. D. Shapiro, G. Shapiro, P. H. Eberhard, J. M. Hauptman, D. L. Fancher, N. J. Hadley, K. K. Kwong, T. Fujii, J. A J Matthews, B. J. Blumenfeld, S. C. Loken, K. Maruyama, R. R. Kofler, R. van Tyen, M. L. Stevenson, H. S. Kaye, and C. D. Buchanan

Subjects
Nuclear physics, Quark, Physics, Particle physics, Muon, Annihilation, Hadron, Bottom quark, Charm quark
Abstract

We have studied the production of prompt muons in hadronic events from ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilation at a center-of-mass energy of 29 GeV with the PEP4-TPC (Time Projection Chamber) detector. The muon p and ${p}_{t}$ distributions are well described by a combination of bottom- and charm-quark decays, with fitted semimuonic branching fractions of (15.2\ifmmode\pm\else\textpm\fi{}1.9\ifmmode\pm\else\textpm\fi{}1.2)% and (6.9\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}1.1)%, respectively. The muon spectra imply hard fragmentation functions for both b and c quarks, with 〈z(b quark)〉=0.80\ifmmode\pm\else\textpm\fi{}0.05\ifmmode\pm\else\textpm\fi{}0.05 and 〈z(c quark)〉=0.60\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.04. We derive neutral-current axial-vector couplings of a(b quark)=-0.9\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}0.3 and a(c quark)=1.5\ifmmode\pm\else\textpm\fi{}1.5\ifmmode\pm\else\textpm\fi{}0.5 from the forward-backward asymmetries.

Published
1985

23. Study of baryon correlations ine+e−annihilation at 29 GeV

Author

A. Lu, Peter Nemethy, J. S. Steinman, J. E. Huth, B. C. Shen, S. Toutounchi, T. Kamae, L. Mathis, R. R. McNeil, A. Barbaro-Galtieri, R. R. van Daalen Wetters, B. A. Barnett, R. Lander, Kaori Maeshima, C. D. Buchanan, S. C. Loken, E. M. Wang, D. E. Pellet, Margaret Alston-Garnjost, R. van Tyen, W. G.J. Langeveld, H. U. Bengtsson, B. van Uitert, G. E. Masek, E. S. Miller, X. Q. Lu, K. A. Schwitkis, H. Yamamoto, S. O. Melnikoff, Hiroaki Aihara, J. N. Marx, R. I. Koda, J. Hylen, N. Toge, S. J. Yellin, S. J. Maxfield, C. Zeitlin, F. R. Rouse, C. S. Lindsey, K. A. Derby, R. W. Kenney, J. T. White, J. C. Sens, D. O. Caldwell, W. Vernon, M. S. C. Williams, Z. R. Wolf, G. Cowan, Mitchell Wayne, J. Thompson, Marjorie Shapiro, W. Moses, G. J. VanDalen, B. D. Magnuson, J. W. Gary, D. A. Park, Toshitsugu Fujii, Philippe Eberhard, H. S. Kaye, T. K. Edberg, G. R. Lynch, Y. X. Wang, Tadayuki Takahashi, Ryoji Enomoto, W. E. Slater, M. G. Strauss, A. Buijs, P. J. Oddone, F.L. Linde, Werner Hofmann, R.E. Avery, R. R. Ross, T. Bolognese, H. P. Paar, R. J. Madaras, D. A. Crane, W. Gorn, S. K. Park, J. J. Eastman, W.A. Wenzel, Gilbert Shapiro, M. L. Stevenson, M. T. Ronan, K. K. Kwong, M. Pripstein, J. A. J. Matthews, M. K. Sullivan, A. D. Bross, A.R. Barker, J. R. Smith, K. H. Kees, D. R. Nygren, J. M. Hauptman, W. M. Zhang, R. R. Kofler, F. C. Erné, A. M. Eisner, Winston Ko, G. J. Bobbink, Orin I. Dahl, D. L. Bintinger, Wolfgang Wagner, A. R. Clark, D.A. Bauer, L. T. Kerth, A. V. Barnes, D. H. Stork, and J. G. Layter

Subjects
Baryon, Nuclear physics, Physics, Particle physics, Annihilation, Electron–positron annihilation, General Physics and Astronomy
Published
1986

24. ΛProduction ine+e−Annihilation at 29 GeV

Author

B. A. Barnett, B. Gabioud, W. E. Slater, G. J. VanDalen, A. Pevsner, Hirotsugu Fujii, D. A. Park, Philippe Eberhard, A. Barbaro-Galtieri, J. W. Gary, W. Gorn, G. R. Lynch, C. S. Lindsey, K. Maruyama, R. F. van Daalen Wetters, Marjorie Shapiro, C. Y. Chien, K. A. Derby, W. Moses, M. Pripstein, L. T. Kerth, Werner Hofmann, H. K. Ticho, J. A. Bakken, P. J. Oddone, H. S. Kaye, J. E. Huth, R. R. Ross, M. T. Ronan, K. K. Kwong, R. J. Madaras, A. R. Clark, D. L. Fancher, H. Aihara, M. Yamauchi, A. Cordier, L. Madansky, J. M. Hauptman, C. D. Buchanan, J. Hylen, T. Kamae, H. Yamamoto, R. I. Koda, D. R. Nygren, Peter Nemethy, Barry Blumenfeld, A. D. Bross, J. A. J. Matthews, S. C. Loken, Owen Chamberlain, W.A. Wenzel, Gilbert Shapiro, Nicholas John Hadley, F. R. Rouse, M. L. Stevenson, X. Q. Lu, Mitchell Wayne, Toshitsugu Fujii, E. M. Wang, Margaret Alston-Garnjost, R. van Tyen, B. C. Shen, P. R. Robrish, S. O. Melnikoff, R. W. Kenney, N. Toge, W. M. Zhang, R. R. Kofler, J. N. Marx, Orin I. Dahl, C. T. Day, A. V. Barnes, D. H. Stork, R. R. Sauerwein, and J. G. Layter

Subjects
Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, General Physics and Astronomy, Lambda baryon, Lambda, Baryon, Pair production, Antimatter, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment
Abstract

The inclusive production cross section of ..lambda.., anti ..lambda.. in e/sup +/e/sup -/ annihilation at a c.m. energy of 29 GeV has been measured with the time-projection-chamber detector at PEP. The average lambda, anti lambda multiplicity has been measured to be 0.197 +/- 0.012 (stat.) +/- 0.017 (syst.). ..lambda..-anti..lambda.. pairs have been observed in jets for the first time, and the average number of ..lambda..-anti..lambda.. pairs per event has been measured to be 0.042 +/- 0.017 +/- 0.014. 8 references, 3 figures.

Published
1985

25. Tests of Models for Parton Fragmentation by Means of Three-Jet Events ine+e−Annihilation ats=29GeV

Author

B. A. Barnett, W. M. Zhang, G. R. Lynch, R. R. Kofler, Mitchell Wayne, C. Y. Chien, L. Madansky, R. I. Koda, Orin I. Dahl, D. R. Nygren, N. Toge, J. A. Bakken, H. S. Kaye, Werner Hofmann, W. Moses, E. M. Wang, A. R. Clark, Margaret Alston-Garnjost, R. van Tyen, A. Cordier, Barry Blumenfeld, A. Pevsner, H. U. Bengtsson, J. G. Layter, B. Gabioud, Owen Chamberlain, J. N. Marx, Marjorie Shapiro, B. C. Shen, J. M. Hauptman, Peter Nemethy, J. E. Huth, Toshitsugu Fujii, Nicholas John Hadley, H. Yamamoto, D. L. Fancher, A. Barbaro-Galtieri, Y. Yamauchi, T. Kamae, C. T. Day, J. A. J. Matthews, K. Maruyama, Philippe Eberhard, J. W. Gary, F. R. Rouse, A. V. Barnes, S. O. Melnikoff, H. K. Ticho, R. F. van Daalen Wetters, D. H. Stork, A. D. Bross, P. R. Robrish, W.A. Wenzel, Gilbert Shapiro, R. R. Sauerwein, C. S. Lindsey, J. Hylen, W. E. Slater, L. T. Kerth, M. Pripstein, R. W. Kenney, X. Q. Lu, M. L. Stevenson, M. T. Ronan, K. A. Derby, K. K. Kwong, H. Aihara, G. J. VanDalen, Hirotsugu Fujii, D. A. Park, S. C. Loken, C. D. Buchanan, P. J. Oddone, R. R. Ross, R. J. Madaras, and W. Gorn

Subjects
Quantum chromodynamics, Physics, Particle physics, Annihilation, Mathematical model, Quark model, Hadron, Lund string model, General Physics and Astronomy, Parton, Elementary particle, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The distribution of particles in three-jet events is compared with the predictions of three fragmentation models currently in use: the Lund string model, the Webber cluster model, and an independent fragmentation model. The Lund model and, to a certain extent, the Webber model provide reasonable descriptions of the data. The independent fragmentation model does not describe the distribution of particles at large angles with respect to the jet axes. The results provide evidence that the sources of hadrons are Lorentz boosted with respect to the overall c.m.

Published
1985

26. Performance of the hexagonal calorimeter at PEP-4

Author

S. C. Loken, P. J. Oddone, P. S. Martin, R. R. Ross, R. J. Madaras, J. A. Bakken, N. J. Hadley, C.Y. Chien, C. D. Buchanan, G. W. London, J. Hylen, M. E. Zeller, C. T. Day, J. N. Marx, O. Chamberlain, M. D. Shapiro, J. M. Hauptman, R. F. van Daalen Wetters, G. R. Lynch, Hiroaki Aihara, Mitchell Wayne, P. R. Robrish, X. Q. Lu, W. Gorn, A. Pevsner, H. J. Hilke, L. T. Kerth, H. Iwasaki, Barry Blumenfeld, B. Gabioud, J. Chiba, K. Maruyama, W. A. Wenzel, F. R. Rouse, H. Fujii, Werner Hofmann, D. R. Nygren, H. K. Ticho, J. A. J. Matthews, J. W. Gary, M. Pripstein, J. Mallet, D. L. Fancher, P. H. Eberhard, R. van Tyen, G. Shapiro, W. Moses, B. C. Shen, B. Heck, G. J. Van Dalen, M. Yamauchi, O. I. Dahl, William Carithers, M. Alston-Garnjost, L. Madansky, A. R. Clark, B. A. Barnett, R. I. Koda, H. Videau, S. O. Melnikoff, D. H. Badtke, A. D. Bross, R. M. Majka, W. M. Zhang, R. W. Kenney, R. R. Kofler, J. G. Layter, M. Urban, A. V. Barnes, D. H. Stork, W. E. Slater, P. Delpierre, C. S. Lindsey, A. Barbaro-Galtieri, J. E. Huth, K. A. Derby, P. Nemethy, M. L. Stevenson, T. Kamae, D. A. Park, N. Toge, M. T. Ronan, and K. K. Kwong

Subjects
Physics, Jet (fluid), Calorimeter (particle physics), Physics::Instrumentation and Detectors, business.industry, Monte Carlo method, General Engineering, Solid angle, STRIPS, law.invention, Optics, law, Calibration, High Energy Physics::Experiment, business, Image resolution, Projective geometry
Abstract

A Geiger-mode electromagnetic shower calorimeter has been constructed for PEP-4. Six trapezoidal modules cover 75% of 4 π solid angle in a hexagonal array. Each module contains 40 sense wire planes between 0.25 radiation-length thick lead-laminates, and is divided electrically into submodules of 27 and 13 layers. Half-degree wide hodoscopic channels in projective geometry provide excellent spatial resolution. In each gap three stereo views using the sense wires as well as strips on both cathodes at ±60° to the wires provide good shower reconstruction capabilities in multi-track jet events. Calibration and data analysis procedures are outlined. The performance of the calorimeter in the measurement of Bhabha events and the reconstruction of π 0 's in jet events is in excellent agreement with Monte Carlo simulations. The π 0 mass resolution is MeV (rms).

Published
1983

27. Spatial Resolution of the PEP-4 Time Projection Chamber

Author

B. C. Shen, K. A. Derby, D. H. Badtke, R. W. Kenney, A. Pevsner, H. Iwasaki, F. R. Rouse, Barry Blumenfeld, O. I. Dahl, J. E. Huth, A. Barbaro-Galtieri, M. Alston-Garnjost, K. Maruyama, L. Madansky, J. Chiba, J. Hylen, B. A. Barnett, R. I. Koda, Hiroaki Aihara, R. van Tyen, R. R. Kofler, J. M. Hauptman, H. K. Ticho, B. Gabioud, P. S. Martin, T. Fujii, R. J. Madaras, W. A. Wenzel, C. S. Lindsey, S. O. Melnikoff, M. E. Zeller, M. L. Stevenson, X-Q. Lu, M. D. Shapiro, J. G. Layter, A. D. Bross, J. N. Marx, Mitchell Wayne, H. Videau, D. R. Nygren, W. Moses, R. F. vanDaalen Wetters, J. W. Gary, P. Delpierre, P. J. Oddone, N. J. Hadley, N. Toge, J. A. Bakken, M. Yamauchi, G. Shapiro, Ronald Madaras, P. Nemethy, A. V. Barnes, R. R. Ross, H. Hilke, M. Pripstein, J. A. J. Matthews, G. J. Van Dalen, G. R. Lynch, Allan G Clark, D. H. Stork, P. R. Robrish, D. L. Fancher, J. Mallet, D. A. Park, O. Chamberlain, R. Majka, S. C. Loken, W. C. Carithers, P. H. Eberhard, C.Y. Chien, K. K. Kwong, H. Fujii, W-M. Zhang, M. T. Ronan, T. Kamae, W. E. Slater, C. D. Buchanan, M. Urban, W. Gorn, B. Heck, C. T. Day, and L. T. Kerth

Subjects
Physics, Nuclear and High Energy Physics, Argon, Time projection chamber, Physics::Instrumentation and Detectors, business.industry, Resolution (electron density), chemistry.chemical_element, Particle detector, Cathode, Magnetic field, law.invention, Optics, Nuclear magnetic resonance, Nuclear Energy and Engineering, chemistry, Physics::Plasma Physics, law, Measuring instrument, Electrical and Electronic Engineering, business, Image resolution
Abstract

The spatial resolution and response of the segmented cathode pads of the PEP-4 TPC have been measured with data taken at 8.5 atmospheres of 80% Argon-20% Methane gas with a 4kG magnetic field. The dependence of the spatial resolution and pad response on drift distance and track-anode crossing angle is presented.

Published
1983

28. Characteristics of Proton Production in Jets frome+e−Annihilation at 29 GeV

Author

X. Q. Lu, W. E. Slater, W.A. Wenzel, Gilbert Shapiro, W. Gorn, M. L. Stevenson, S. C. Loken, A. R. Clark, D. H. Badtke, J. G. Layter, Peter Nemethy, B. Gabioud, C. D. Buchanan, L. Madansky, A. Barbaro-Galtieri, G. R. Lynch, C. S. Lindsey, H. Iwasaki, Owen Chamberlain, H. J. Hilke, W. M. Zhang, R. I. Koda, H. Videau, P. S. Martin, R. R. Kofler, J. Chiba, J. A. Bakken, R. M. Majka, Philippe Eberhard, A. Cordier, S. O. Melnikoff, M. T. Ronan, K. K. Kwong, C. Y. Chien, C. T. Day, Marjorie Shapiro, Mitchell Wayne, Orin I. Dahl, D. R. Nygren, G. J. VanDalen, N. Toge, K. Maruyama, Werner Hofmann, P. J. Oddone, W. Moses, R. F. van Daalen Wetters, R. W. Kenney, Hirotsugu Fujii, D. A. Park, P. R. Robrish, J. A. J. Matthews, L. T. Kerth, J. M. Hauptman, R. R. Ross, R. J. Madaras, H. K. Ticho, H. Yamamoto, D. L. Fancher, Hiroaki Aihara, J. Hylen, K. A. Derby, J. W. Gary, B. A. Barnett, F. R. Rouse, M. Yamauchi, M. Pripstein, Toshitsugu Fujii, A. D. Bross, Margaret Alston-Garnjost, Nicholas John Hadley, R. van Tyen, J. E. Huth, B. C. Shen, J. N. Marx, Barry Blumenfeld, T. Kamae, A. V. Barnes, D. H. Stork, R. R. Sauerwein, and A. Pevsner

Subjects
Physics, Particle physics, Annihilation, Proton, Meson, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Nuclear physics, Baryon, Pion, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract

Proton production in e/sup +/e/sup -/ annihilation at 29 GeV has been studied with the time projection chamber. Measurements of the dependence of proton fractions on momentum, transverse momentum with respect to the jet axis, hadron multiplicity, and event sphericity are reported. Our results are consistent with the assumption that primary baryons and mesons have similar production spectra, and indicate that protons provide more direct probes of underlying fragmentation phenomena than do pions.

Published
1984

29. Measurement ofτbranching ratios

Author

H. Aihara, M. Alston-Garnjost, R. E. Avery, J. A. Bakken, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H.-U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, C-Y. Chien, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, T. K. Edberg, P. H. Eberhard, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X-Q. Lu, G. R. Lynch, L. Madansky, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, A. Pevsner, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin, and W-M. Zhang

Subjects
Nuclear physics, Physics, Semileptonic decay, Particle decay, Particle physics, Muon, Pion, Meson, Branching fraction, Hadron, Lepton
Abstract

Using the data accumulated at LEP in 1989 and 1990 with the ALEPH detector, the inclusive and exclusive branching ratios of the τ lepton have been measured assuming lepton universality inZ0 decays. The inclusive branching fractions for the τ decay into one, three, and five charged particles have been determined to be (85.45±0.97)%, (14.35±0.48)%, and (0.10±0.05)%, respectively, in agreement with the world averages. New undetected decay modes are determined to have a branching fraction of less than 2.1% at 95% CL. The measured branching ratios for quasi-exclusive channels are slightly larger than, but consistent with the world averages, except for the modes τ→3 hadrons+v τ andτ→hadron+2π0v τ , which are significantly larger. These latter branching ratios have been found to be (9.5±0.7)% and (10.2±1.1)%, respectively. The sum of all the measured quasi-exclusive branching ratios is (100.4±1.8)%. A fully exclusive analysis of modes with neutral pions shows no evidence for new photonic decay modes with a branching fraction limit of 3.4% at 95% CL.

Published
1987

30. The Lead-Glass Wall Addition to the Spear Mark I Magnetic Detector

Author

D. H. Miller, P. Leconte, R. Ely, T. G. Trippe, M. T. Ronan, R. J. Madaras, F. B. Heile, B. Pardoe, G. J. Feldman, A. M. Litke, Martin L. Perl, D. Luke, D. L. Scharre, T. S. Mast, M. Piccolo, G. Hanson, T. P. Pun, Sherwood Parker, D. E. Yount, P. A. Rapidis, A. Barbaro-Galtieri, B. Gobbi, J. M. Feller, J. M. Dorfan, J. F. Martin, Bernard Sadoulet, J. A. Jaros, A. Fong, I. Peruzzi, B. P. Kwan, V. Vuillemin, and R. R. Ross

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Physics::Instrumentation and Detectors, Mark I, Astrophysics::Instrumentation and Methods for Astrophysics, Solid angle, Steradian, Particle accelerator, Magnetic detector, Particle detector, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, Electrical and Electronic Engineering, Cherenkov radiation
Abstract

A "Lead-Glass Wall," consisting of 318 lead-glass Cherenkov shower counters and three wire spark chambers, has been added to one octant of the SPEAR Mark I Magnetic Detector. The wall covers a solid angle of approximately 6% of 4? steradians and has been used to identify and measure the energies of electrons and photons produced in electron-positron collisions. The design, calibration, gain-monitoring, and performance of the system are described.

Published
1978

31. Baryon Production ine+e−Annihilation ats=29GeV: Clusters or Diquarks?

Author

W. Moses, D. L. Fancher, S. C. Loken, M. Yamauchi, B. C. Shen, A. D. Bross, X. Q. Lu, G. R. Lynch, H. U. Bengtsson, C. Y. Chien, Werner Hofmann, J. W. Gary, Marjorie Shapiro, Owen Chamberlain, J. N. Marx, B. A. Barnett, A. Cordier, Mitchell Wayne, J. M. Hauptman, H. Yamamoto, Barry Blumenfeld, M. Pripstein, A. V. Barnes, K. Maruyama, D. H. Stork, R. R. Sauerwein, P. R. Robrish, E. M. Wang, W.A. Wenzel, H. K. Ticho, W. M. Zhang, Philippe Eberhard, F. R. Rouse, R. R. Kofler, Gilbert Shapiro, Margaret Alston-Garnjost, R. van Tyen, W. Gorn, Orin I. Dahl, D. R. Nygren, S. O. Melnikoff, J. A. J. Matthews, M. L. Stevenson, J. G. Layter, Toshitsugu Fujii, R. W. Kenney, C. T. Day, C. S. Lindsey, G. J. VanDalen, P. J. Oddone, Hirotsugu Fujii, R. R. Ross, J. Hylen, L. Madansky, D. A. Park, R. J. Madaras, Peter Nemethy, C. D. Buchanan, R. I. Koda, Nicholas John Hadley, K. A. Derby, J. A. Bakken, H. S. Kaye, M. T. Ronan, N. Toge, K. K. Kwong, H. Aihara, W. E. Slater, R. F. van Daalen Wetters, L. T. Kerth, B. Gabioud, A. Barbaro-Galtieri, A. R. Clark, J. E. Huth, T. Kamae, and A. Pevsner

Subjects
Physics, Particle physics, Annihilation, Meson, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Quark model, General Physics and Astronomy, Elementary particle, Nuclear physics, Baryon, Diquark, Pair production, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We use the time-projection chamber detector to study mechanisms of baryon production in the central rapidity region of jets from e/sup +/e/sup -/ annihilation. On the basis of angular correlations between protons and antiprotons, we exclude the isotropic decay of heavy mesonic clusters as a dominant source of baryons at 95% confidence level. The diquark mechanisms used in string fragmentation models reproduce the data, provided that diquarks are formed in a two-step process which allows mesons to be produced in between the baryon and antibaryon.

Published
1985

32. Observation of scaling of the photon structure functionF2γat lowQ2

Author

T. Fujii, C. Zeitlin, B. A. Barnett, W. Vernon, Xiaochuan Lu, H. Yamamoto, S. O. Melnikoff, D. A. Bauer, J. W. Gary, G. E. Masek, J. R. Smith, D. R. Nygren, A. Lu, F. L. Linde, G. Shapiro, M. Pripstein, K. Maeshima, L. T. Kerth, K. K. Kwong, M. T. Ronan, W. E. Slater, J. J. Eastman, M. G. Strauss, R. R. Kofler, G. R. Lynch, S. J. Maxfield, P. H. Eberhard, W. M. Zhang, M. K. Sullivan, R. I. Koda, D. A. Park, W. G.J. Langeveld, M. R. Wayne, J. T. White, R. R. McNeil, Sung-Ho Park, F. R. Rouse, B. C. Shen, D. E. Pellett, W. Moses, S. C. Loken, R. W. Kenney, C. D. Buchanan, T. S. Bolognese, W.A. Wenzel, P. H.U. Bengtsson, D. H. Stork, D. O. Caldwell, J. A.J. Matthews, S. Toutounchi, K. A. Schwitkis, D. L. Bintinger, M. C.S. Williams, M. Alston-Garnjost, Z. R. Wolf, M. L. Stevenson, H. S. Kaye, L. G. Mathis, Werner Hofmann, P. Némethy, K. A. Derby, J. R. Thompson, G. J. Bobbink, T. K. Edberg, A. M. Eisner, J. E. Huth, A. R. Clark, W. Gorn, Marjorie Shapiro, A. D. Bross, Hiroaki Aihara, Winston Ko, C. S. Lindsey, J. C. Sens, G. D. Cowan, E. M. Wang, A. Barbaro-Galtieri, T. Takahashi, R. van Tyen, T. Kamae, R. E. Avery, A. Buijs, J. Hylen, J. S. Steinman, P. J. Oddone, D. A. Crane, R. R. Ross, K. H. Kees, R. J. Madaras, A. V. Barnes, Yayu Wang, F. C. Erné, H. P. Paar, E. S. Miller, B. Van Uitert, J. N. Marx, J. G. Layter, R. L. Lander, B. D. Magnuson, S. J. Yellin, W. Wagner, A. R. Barker, G. J. VanDalen, R. Enomoto, J. M. Hauptman, O. I. Dahl, N. Toge, and R. F. Van Daalen Wetters

Subjects
Physics, General Physics and Astronomy, Atomic physics, Scaling, Photon structure function
Published
1987

33. Quench protection for a 2-MJ magnet

Author

R. R. Ross, G. Gibson, M. Alston-Garnjost, B. Pardoe, P. H. Eberhard, M. Pripstein, P. Lecomte, J. D. Taylor, Martin A. Green, and R. Smits

Subjects
Materials science, Electromagnet, Nuclear engineering, Varistor, Superconducting magnet, Electronic, Optical and Magnetic Materials, law.invention, law, Electromagnetic coil, Electrical equipment, Magnet, Electrical and Electronic Engineering, Resistor, Electrical conductor
Abstract

A superconducting solenoid with conductive bore tube has been used at energies up to 1.9-MJ to test various methods of quench protection. The methods all involve shifting the main coil current to the conductive bore tube and include (1) allowing the quench to evolve naturally, (2) interrupting the primary circuit while providing a varistor used as a shunt across the coil, and (3) turning the entire magnet normal by dumping a short pulse of current from a capacitor bank through the windings.

Published
1979

34. Evidence for a Spin-1 Particle Produced by Two Photons

Author

H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H. -U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, P. H. Eberhard, T. K. Edberg, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X. -Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin, W. -M. Zhang, and IHEF (IoP, FNWI)

Subjects
Physics, Particle physics, Photon, Meson, General Physics and Astronomy, Resonance, Particle, High Energy Physics::Experiment, Production (computer science), Storage ring, Spin-½
Abstract

Two-photon production of ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$ states has been studied by the TPC/Two-Gamma experiment at the SLAC storage ring PEP. A resonance of mass 1.42 GeV was seen when one of the photons was quite virtual but not when both photons were nearly real. Production of a spin-1 meson, which cannot be made by two real photons, would fit these observations. The ${Q}^{2}$ dependence of the data in the resonance region agrees with this spin assignment and is incompatible with a spin-0 hypothesis. The mass and width of the resonance are similar to those of the $E$ meson, which has been assigned ${J}^{P}={0}^{\ensuremath{-}}$ and ${J}^{P}={1}^{+}$ by different experiments.

Published
1986

35. Experimental limit on the decayτ−→ντK−K0

Author

H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H. -U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, P. H. Eberhard, T. K. Edberg, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X. -Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin, and W. -M. Zhang

Subjects
Physics, Particle physics, Tau neutrino, Electron–positron annihilation, General Physics and Astronomy, Limit (mathematics)
Published
1987

36. Charged-Hadron Inclusive Cross Sections and Fractions ine+e−Annihilation ats=29GeV

Author

A.R. Barker, D. R. Nygren, H. Yamamoto, J. G. Layter, G. E. Masek, J. M. Hauptman, S. J. Yellin, W. Moses, F. C. Erné, A. M. Eisner, F. R. Rouse, J. C. Sens, Z. R. Wolf, W. Vernon, M. Pripstein, S. Khacheryan, D. O. Caldwell, S. J. Maxfield, M. K. Sullivan, D. H. Stork, W. G.J. Langeveld, G. Cowan, J. R. Smith, Philippe Eberhard, R. R. Kofler, R. W. Kenney, B. C. Shen, A. Barbaro-Galtieri, Orin I. Dahl, D.A. Bauer, A. Lu, S. Toutounchi, Wolfgang Wagner, D. A. Crane, S. K. Park, J. Hylen, J. A. J. Matthews, T. K. Edberg, D. E. Pellett, F.L. Linde, B. D. Magnuson, A. R. Clark, G. J. Bobbink, H. P. Paar, J. S. Steinman, C. D. Buchanan, G. R. Lynch, H. Y. Chao, W.A. Wenzel, M. G. Strauss, T. Kamae, S. C. Loken, Gilbert Shapiro, Werner Hofmann, K. A. Derby, A. Bay, Y. X. Wang, Tadayuki Takahashi, M. L. Stevenson, P. J. Oddone, E. M. Wang, R. R. Ross, R. J. Madaras, Margaret Alston-Garnjost, R. van Tyen, H. S. Kaye, M. T. Ronan, K. H. Fairfield, H. Aihara, Ryoji Enomoto, E. S. Miller, K. A. Schwitkis, A. Buijs, R.E. Avery, J. J. Eastman, M. Daoudi, B. A. Barnett, L. Mathis, W. T. Lin, S. B. Chun, C. Zeitlin, and R. W. Stephens

Subjects
Nuclear physics, Physics, Particle physics, Annihilation, Hadron, General Physics and Astronomy
Published
1988

37. Measurement of Ionization Loss in the Relativistic Rise Region with the Time Projection Chamber

Author

L. Madansky, W. E. Slater, W. Gorn, C.Y. Chien, J. A. Bakken, B. Gabioud, M. T. Ronan, A. V. Barnes, J. M. Hauptman, J. A. J. Matthews, R. I. Koda, M. Urban, H. Hilke, C. D. Buchanan, K. K. Kwong, R. van Tyen, J. G. Layter, B. A. Barnett, W-M. Zhang, P. R. Robrish, S. C. Loken, W. C. Carithers, R. F. vanDaalen Wetters, J. Mallet, M. Yamauchi, P. S. Martin, Hiroaki Aihara, H. Fujii, P. H. Eberhard, K. A. Derby, K. Maruyama, T. Fujii, R. R. Kofler, T. Kamae, A. D. Bross, G. Shapiro, Ronald Madaras, M. L. Stevenson, M. D. Shapiro, Bernard Gabioud, G. R. Lynch, X-Q. Lu, B. Heck, J. E. Huth, J. Chiba, D. A. Park, O. Chamberlain, N. Toge, C. T. Day, M. Alston-Garnjost, H. K. Ticho, D. L. Fancher, R. R. Ross, J. W. Gary, F. R. Rouse, W. Moses, M. Pripstein, J. N. Marx, D. H. Stork, S. O. Melnikoff, P. J. Oddone, D. R. Nygren, J. Hylen, P. Nemethy, L. T. Kerth, R. Majka, H. Iwasaki, A. Pevsner, Barry Blumenfeld, H. Videau, N. J. Hadley, G. J. Van Dalen, A. Barbaro-Galtieri, O. I. Dahl, M. E. Zeller, A. R. Clark, Mitchell Wayne, D. H. Badtke, R. W. Kenney, W. A. Wenzel, C. S. Lindsey, P. Delpierre, and B. C. Shen

Subjects
Physics, Nuclear and High Energy Physics, Time projection chamber, Astrophysics::High Energy Astrophysical Phenomena, Resolution (electron density), Cosmic ray, Particle identification, Standard deviation, Cathode, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, Ionization, Calibration, High Energy Physics::Experiment, Electrical and Electronic Engineering
Abstract

We present here some results obtained with the LBL Time Projection Chamber (TPC) regarding the particle identification by the measurement of the ionization losses in the relativistic rise region. This includes the method of calibration using 55Fe sources, the measurement of the resolution using cosmic rays, which shows an equivalent K-? separation of 4.8 standard deviations at 3.5 GeV/c, and the preliminary results obtained with multihadronic events from e+e- annihilations.

Published
1983

38. Experimental limit onι→γγand the interpretation of the iota as a glueball

Author

H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H.-U. Bengtsson, D. L. Bintinger, B. J. Blumenfeld, G. J. Bobbink, A. D. Bross, C. D. Buchanan, A. Buijs, M. P. Cain, D. O. Caldwell, O. Chamberlain, C.-Y. Chien, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, P. H. Eberhard, A. M. Eisner, R. Enomoto, F. C. Erne, T. Fujii, B. Gabioud, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, U. P. Joshi, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X-Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, K. Maruyama, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, R. R. Sauerwein, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, M. Yamauchi, S. J. Yellin, C. Zeitlin, and W.-M. Zhang

Subjects
Physics, Nuclear physics, Iota, Particle physics, Pion, Pair production, Meson, Glueball, Branching fraction, Hadron, General Physics and Astronomy, Spectral line
Abstract

By observing the reaction ..gamma gamma -->..K-italic/sub s-italic//sup 0/K/sup +-/..pi../sup minus-or-plus/, the TPC/Two-Gamma experiment at the SLAC e-italic/sup +/e/sup -/ storage ring PEP has obtained a 95%-confidence-level limit of GAMMA/sub iota//sub ..-->..//sub ..gamma..//sub ..gamma../B(iota..-->..KK-bar..pi..) ..//sub ..gamma..//sub ..gamma../ limit appears to conflict with previous assignments of an observed rho..gamma.. decay to iota and also with many analyses of eta-eta'-iota mixing. The contrast of this small ..gamma gamma.. width with the large rate for J-italic/psi..--> gamma..iota is evidence that the iota is a glueball with little admixture of q-italicq-bar states.

Published
1986

39. Charged Hadron Production ine+e−Annihilation at 29 GeV

Author

H. Aihara, M. Alston-Garnjost, D. H. Badke, J. A. Bakken, A. Barbaro-Galtieri, A. V. Barnes, B. A. Barnett, B. J. Blumenfeld, A. D. Bross, C. D. Buchanan, O. Chamberlain, C. Chen, J. Chiba, C. -Y. Chien, A. R. Clark, O. I. Dahl, C. T. Day, P. Delpierre, K. A. Derby, P. H. Eberhard, D. L. Fancher, H. Fujii, T. Fujii, B. Gabioud, J. W. Gary, W. Gorn, W. Gu, N. J. Hadley, J. M. Hauptman, H. J. Hilke, W. Hofmann, J. E. Huth, J. Hylen, H. Iwasaki, T. Kamae, R. W. Kenney, L. T. Kerth, R. I. Koda, R. R. Kofler, K. K. Kwong, J. G. Layter, C. S. Lindsey, S. C. Loken, G. W. London, X. -Q. Lu, G. R. Lynch, L. Madansky, R. J. Madaras, R. Majka, J. Mallet, P. S. Martin, K. Maruyama, J. N. Marx, J. A. Matthews, S. O. Melnikoff, W. Moses, P. Nemethy, D. R. Nygren, P. J. Oddone, D. A. Park, A. Pevsner, M. Pripstein, P. R. Robrish, M. T. Ronan, R. R. Ross, F. R. Rouse, R. R. Sauerwein, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, M. L. Stevenson, D. H. Stork, H. K. Ticho, N. Toge, M. Urban, R. F. van Daalen Wetters, G. J. VanDalen, R. van Tyen, H. Videau, M. R. Wayne, W. A. Wenzel, H. A. Yamamoto, M. Yamauchi, M. E. Zeller, and W. -M. Zhang

Subjects
Nuclear physics, Baryon, Physics, Particle physics, Annihilation, Time projection chamber, Meson, Electron–positron annihilation, General Physics and Astronomy, High Energy Physics::Experiment, Charged particle, Particle identification, Hadronization
Abstract

Data from the Time Projection Chamber at the SLAC storage ring PEP have been used to study the inclusive production of charged hadrons. Particles were identified by simultaneous dE/dx and momentum measurements. Cross sections and particle fractions for pi +/-, k+/-, and p(anti-p) are given as a function of several variables. Predictions of various hadronization models are compared to the data. A comparison is made with other fragmentation processes.

Published
1984

40. Inclusive production of D-mesons in e+e− annihilation at 7 GeV

Author

Sherwood Parker, R. H. Schindler, William Chinowsky, James E Wiss, B. P. Kwan, Thomas G Trippe, D. H. Miller, I. M. Peruzzi, B. Gobbi, Martin Breidenbach, G. S. Abrams, Burton Richter, P. Lecomte, R. Ely, J. Dorfan, A. M. Boyarski, M. Piccolo, J. M. Feller, R. R. Larsen, R. J. Madaras, J. A. Kadyk, R. R. Ross, V. Luth, J. A. Jaros, A. Fong, D. E. Yount, J. F. Martin, D. L. Scharre, M. S. Alam, P. A. Rapidis, J. L. Siegrist, M. L. Perl, Angela Barbaro-Galtieri, T. P. Pun, V. Vuillemin, Michael T Ronan, D. Lüke, G. G. Hanson, G. J. Feldman, G. Goldhaber, Alan Litke, and J. M. Paterson

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Pion, Meson, Electron–positron annihilation, Energy spectrum, High Energy Physics::Experiment, Energy–momentum relation, Nuclear Experiment, Spectral line
Abstract

Inclusive momentum and energy spectra of neutral and charged D-mesons produced in e+e− annihilation at energies near 7 GeV are presented. The slope of the energy spectrum is similar to the charged pion spectrum at the same energy. The inclusive cross section σ(e+e−→ D or D + anything) at 7 GeV is 4.8±1.3 nb.

Published
1979

41. Study ofη’formation in photon-photon collisions

Author

H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H. -U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, P. H. Eberhard, T. K. Edberg, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X-Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin, and W-M. Zhang

Subjects
Physics, Nuclear physics, Particle physics, Photon, Prime (order theory)
Published
1987

42. Study of Bose-Einstein correlations ine+e−annihilation at 29 GeV

Author

H. K. Ticho, L. T. Kerth, Em Wang, D. R. Nygren, G. R. Lynch, W. A. Wenzel, W. E. Slater, A. R. Clark, X. Q. Lu, M. Yamauchi, F. R. Rouse, L. Madansky, M. L. Stevenson, N. Toge, A. D. Bross, R. W. Kenney, J. Hylen, W. M. Zhang, D. L. Fancher, J. M. Hauptman, C. Y. Chien, R. I. Koda, M. Pripstein, S. C. Loken, K. Maruyama, R. R. Kofler, A. Cordier, M. Alston-Garnjost, C. S. Lindsey, M. D. Shapiro, R. F. van Daalen Wetters, Hirotsugu Fujii, O. Chamberlain, K. A. Derby, H. Yamamoto, M. R. Wayne, A. V. Barnes, R. R. Sauerwein, M. T. Ronan, R. van Tyen, A. Pevsner, B. A. Barnett, G. J. Vandalen, W. Gorn, S. O. Melnikoff, A. Barbaro-Galtieri, R. J. Madaras, J. N. Marx, K. K. Kwong, T. Fujii, B. J. Blumenfeld, J. G. Layter, W. Moses, H. S. Kaye, O. I. Dahl, Tuneyoshi Kamae, H. U. Bengtsson, Hiroaki Aihara, C. D. Buchanan, C. T. Day, J. E. Huth, W. Hofmann, R. R. Ross, P. J. Oddone, D. H. Stork, B. Gabioud, D. A. Park, G. Shapiro, J. A. Bakken, P. H. Eberhard, J. W. Gary, B. C. Shen, P. R. Robrish, N. J. Hadley, Peter Nemethy, and J. A J Matthews

Subjects
Physics, Particle physics, Time projection chamber, Annihilation, Meson, Hadron, Bose–Einstein correlations, Nuclear physics, symbols.namesake, Pion, Pair production, Bose–Einstein statistics, symbols, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Bose-Einstein correlations between like-sign pions have been investigated in e/sup +/e/sup -/ annihilation at ..sqrt..s = 29 GeV using the Time Projection Chamber detector at the SLAC e/sup +/e/sup -/ storage ring PEP. The production rate of like-sign pion pairs with small relative momentum is found to be increased by more than 50% over the rate expected for uncorrelated production of pions. From the correlation length, a typical source radius of 0.65 fm is derived. Data are consistent with a spherical shape of the pion source. No dependence of radius or correlation strength on the event multiplicity is observed.

Published
1985

43. Search for Charge-43eParticles Produced ine+e−Annihilations

Author

M. Urban, A. V. Barnes, Hirotsugu Fujii, D. A. Park, W. E. Slater, P. R. Robrish, D. H. Stork, R. R. Sauerwein, B. A. Barnett, B. C. Shen, S. O. Melnikoff, W. Gorn, K. A. Derby, J. G. Layter, Peter Nemethy, R. W. Kenney, P. Delpierre, M. E. Zeller, J. A. J. Matthews, A. Barbaro-Galtieri, J. N. Marx, J. Hylen, W. M. Zhang, Barry Blumenfeld, M. T. Ronan, R. R. Kofler, G. R. Lynch, C. D. Buchanan, Mitchell Wayne, W. X. Gu, J. A. Bakken, K. K. Kwong, H. J. Hilke, H. Aihara, Orin I. Dahl, M. Pripstein, K. Maruyama, C. Y. Chien, G. W. London, X. Q. Lu, W.A. Wenzel, Gilbert Shapiro, C. Q. Chen, Werner Hofmann, H. K. Ticho, M. L. Stevenson, R. M. Majka, J. E. Huth, P. J. Oddone, C. T. Day, D. R. Nygren, M. Yamauchi, R. R. Ross, J. M. Hauptman, J. Mallet, R. J. Madaras, T. Kamae, Toshitsugu Fujii, A. D. Bross, Nicholas John Hadley, A. Pevsner, Margaret Alston-Garnjost, R. van Tyen, Owen Chamberlain, D. L. Fancher, G. J. Van Dalen, J. Chiba, W. Moses, N. Toge, J. W. Gary, C. S. Lindsey, L. Madansky, R. I. Koda, H. Videau, Marjorie Shapiro, F. R. Rouse, R. F. van Daalen Wetters, L. T. Kerth, A. R. Clark, D. H. Badtke, William Carithers, B. Gabioud, P. S. Martin, H. Iwasaki, Philippe Eberhard, and S. C. Loken

Subjects
Nuclear physics, Physics, General Physics and Astronomy, Charge (physics)
Published
1984

44. Geiger Mode Calorimeter for PEP-4

Author

H. Aihara, M. Alston-Garnjost, D. H. Badtke, J. A. Bakken, A. Barbaro-Galtieri, A. V. Barnes, B. A. Barnett, B. Blumenfeld, A. Bross, C. D. Buchanan, W. C. Carithers, O. Chamberlain, J. Chiba, C-Y. Chien, A. R. Clark, O. I. Dahl, C. T. Day, P. Delpierre, K. A. Derby, P. H. Eberhard, D. L. Fancher, H. Fujii, T. Fujii, B. Gabioud, J. W. Gary, W. Gorn, N. J. Hadley, J. M. Hauptman, B. Heck, H. Hilke, J. E. Huth, J. Hylen, H. Iwasaki, T. Kamae, R. W. Kenney, L. T. Kerth, R. Koda, R. R. Kofler, K. K. Kwong, J. G. Layter, C.S Lindsey, S. C. Loken, X-Q. Lu, G. R. Lynch, L. Madansky, R. J. Madaras, R. Majka, J. Mallet, P. S. Martin, K. Maruyama, J. N. Marx, J. A. J. Matthews, S. O. Melnikoff, W. Moses, P. Nemethy, D. R. Nygren, P. J. Oddonel, D. Park, A. Pevsner, M. Pripstein, P. R. Robrish, M. T. Ronan, R. R. Ross, F. R. Rouse, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, M. L. Stevenson, D. H. Stork, H. K. Ticho, N. Toge, M. Urban, G. J. Van Dalen, R. van Tyen, H. Videau, M. Wayne, W. A. Wenzel, R. F. vanDaalen Wetters, M. Yamauchi, M. E. Zeller, and W-M. Zhang

Subjects
Physics, Nuclear and High Energy Physics, Photon, Calorimeter (particle physics), Physics::Instrumentation and Detectors, business.industry, STRIPS, Particle detector, Cathode, law.invention, Optics, Nuclear Energy and Engineering, law, Measuring instrument, Calibration, Geiger counter, Electrical and Electronic Engineering, business
Abstract

The PEP-4 hexagonal barrel calorimeter, with lead-laminate layers and 5×lOmm2 Geiger-mode discharge cells, has demonstrated excellent stability and uniformity in operation. The use of projective geometry in half degree-wide cathode strips at ±60 degrees to the sense wire channels provides excellent spatial resolution and reconstruction capability. The electronic noise-to-signal ratio without preamplification is sufficiently low that individual 50 pC Geiger discharges are accurately measured and used for energy calibration. Measurements made at 14.5 GeV e± beam energy have provided preliminary spectra of Bhabhas and of photon-photon invariant mass. The latter show that ?o's can be reconstructed.

Published
1983

45. Prompt electron production ine + e − annihilations at 29 GeV

Author

J. N. Marx, T. Fujii, S. C. Loken, P. H. Eberhard, D. L. Fancher, J. A. J. Matthews, N. Toge, Allan G Clark, D. H. Stork, R. I. Koda, A. V. Barnes, W. Gorn, P. S. Martin, O. Chamberlain, H. K. Ticho, Gj Vandalen, B. A. Barnett, R. J. Madaras, M. T. Ronan, H. Iwasaki, Werner Hofmann, Hiroaki Aihara, J. A. Bakken, J. Chiba, P. R. Robrish, D. H. Badtke, W. E. Slater, R. W. Kenney, R. R. Ross, S. O. Melnikoff, L. Madansky, Marjorie Shapiro, F. R. Rouse, C. D. Buchanan, R. R. Kofler, T. Kamae, B. C. Shen, P. Nemethy, M. R. Wayne, J. W. Gary, D. A. Park, M. L. Stevenson, G. Shapiro, M. Yamauchi, A. Cordier, A. Barbaro-Galtieri, X. Q. Lu, C. S. Lindsey, H. Fujii, H. Yamamoto, R. R. Sauerwein, W. M. Zhang, B. Gabioud, H. Hilke, J. M. Hauptman, K. Maruyama, P. J. Oddone, M. Pripstein, W. Moses, H. Videau, W. A. Wenzel, J. G. Layter, Orin I. Dahl, C. Y. Chien, C. T. Day, R. van Tyen, A. Pevsner, N. J. Hadley, R. F. van Daalen Wetters, R. Majka, B. J. Blumenfeld, A. D. Bross, G. Lynch, K. A. Derby, J. E. Huth, M. Alston-Garnjost, L. T. Kerth, J. Hylen, M. E. Zeller, K. K. Kwong, and D. R. Nygren

Subjects
Nuclear physics, Quark, Physics, Particle decay, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Neutral current, Branching fraction, Electron–positron annihilation, Elementary particle, Engineering (miscellaneous), Lepton
Abstract

We have measured the inclusive prompt electron cross section over a wide momentum range (P>0.5 GeV/c) with the PEP-4 TPC detector. The semielectronic branching fractions of thec andb quarks are (9.1±0.9 (stat.)±1.3 (syst.))% and (11.0±1.8±1.0)%, respectively. Theb quark fragmentation function peaks at highz with 〈zb〉=0.74±0.05±0.03. The axial couplings to the neutral current areac=2.3±1.4±1.0 for thec quark andab=−2.0±1.9±0.5 for theb quark.

Published
1985

46. Inclusive Baryon Production ine+e−Annihilation

Author

T. P. Pun, G. J. Feldman, Thomas G Trippe, Martin Breidenbach, H. K. Nguyen, G. H. Trilling, W. Tanenbaum, R. J. Madaras, R. R. Larsen, J. F. Martin, Sherwood Parker, J. A. Kadyk, P. Lecomte, Burton Richter, G. G. Hanson, G. Goldhaber, M. Piccolo, A. Fong, James E Wiss, V. Luth, A. D. Johnson, J. Dorfan, Roy F Schwitters, A. M. Boyarski, R. Ely, J. M. Paterson, D. H. Miller, D. E. Yount, Michael T Ronan, William Chinowsky, V. Vuillemin, J. M. Feller, B. Gobbi, D. L. Scharre, Alan Litke, B. P. Kwan, I. Peruzzi, G. S. Abrams, D. Lüke, Angela Barbaro-Galtieri, R. R. Ross, H. L. Lynch, M. L. Perl, J. A. Jaros, M. S. Alam, and P. A. Rapidis

Subjects
Baryon, Nuclear physics, Physics, Particle physics, Annihilation, Electron–positron annihilation, General Physics and Astronomy
Published
1977

47. Performance of the Signal Processing System for the Time Projection Chamber

Author

K. Maruyama, J. N. Marx, Stewart C. Loken, H. K. Ticho, M. E. Zeller, L. Madansky, W. Moses, A. D. Bross, M. D. Shapiro, R. I. Koda, M. Yamauchi, R. R. Ross, Mitchell Wayne, Allan G Clark, R. van Tyen, M. Pripstein, N. Toge, P. J. Oddone, H. Fujii, G. R. Lynch, J. A. Bakken, D. H. Stork, B. Heck, C. T. Day, F. R. Rouse, D. L. Fancher, B. A. Barnett, G. Shapiro, K. A. Derby, Hiroaki Aihara, W. Gorn, R. R. Kofler, H. Hilke, A. V. Barnes, L. T. Kerth, M. L. Stevenson, B. C. Shen, T. Fujii, M. T. Ronan, S. C. Loken, W. C. Carithers, X-Q. Lu, K. K. Kwong, P. S. Martin, J. A. J. Matthews, A. Pevsner, H. Videau, C. D. Buchanan, P. H. Eberhard, P. R. Robrish, J. W. Gary, Barry Blumenfeld, N. J. Hadley, D. A. Park, O. Chamberlain, J. Hylen, J. E. Huth, W. E. Slater, R. J. Madaras, G. J. Van Dalen, J. G. Layter, M. Urban, M. Alston-Garnjost, P. Nemethy, B. Gabioud, R. Majka, A. Barbaro-Galtieri, R. F. vanDaalen Wetters, C.Y. Chien, O. I. Dahl, D. R. Nygren, J. Mallet, J. M. Hauptman, H. Iwasaki, D. H. Badtke, R. W. Kenney, S. O. Melnikoff, J. Chiba, W-M. Zhang, T. Kamae, W. A. Wenzel, C. S. Lindsey, and P. Delpierre

Subjects
Nuclear and High Energy Physics, Engineering, Signal processing, Time projection chamber, business.industry, Detector, Electrical engineering, System testing, Optics, Nuclear Energy and Engineering, Ionization, Electronics, Electrical and Electronic Engineering, business, Image resolution
Abstract

The Time Projection Chamber has operated in the PEP colliding beams at SLAC since January 1982. Its signal processing system, containing 16020 channels, has been calibrated and monitored using a computer-controlled test pulser system. We describe the test system and review measurements made with the system of signal processing electronics.

Published
1983

48. Comparison of the Particle Flow inqq¯gandqq¯γEvents ine+e−Annihilation

Author

S. O. Melnikoff, A.R. Barker, R. R. van Daalen Wetters, M. Yamauchi, A. D. Bross, F.L. Linde, A. Buijs, S. J. Yellin, E. M. Wang, R. W. Kenney, R.E. Avery, W. E. Slater, Margaret Alston-Garnjost, R. van Tyen, T. Bolognese, J. S. Steinman, J. N. Marx, M. T. Ronan, K. K. Kwong, J. E. Huth, C. S. Lindsey, J. M. Hauptman, H. Aihara, D. A. Crane, Y. X. Wang, Tadayuki Takahashi, B. C. Shen, H. P. Paar, D. L. Bintinger, K. Maruyama, G. E. Masek, J. A. J. Matthews, P. J. Oddone, C. Zeitlin, T. Kamae, D.A. Bauer, D. E. Pellet, M. G. Strauss, R. R. Ross, W.A. Wenzel, R. I. Koda, Gilbert Shapiro, Philippe Eberhard, R. J. Madaras, M. S. C. Williams, B. D. Magnuson, M. L. Stevenson, H. U. Bengtsson, W. Vernon, S. J. Maxfield, J. J. Eastman, C. D. Buchanan, M. Pripstein, G. Cowan, W. G.J. Langeveld, G. J. VanDalen, X. Q. Lu, W. Moses, L. T. Kerth, D. A. Park, B. van Uitert, H. S. Kaye, Z. R. Wolf, S. C. Loken, A. Lu, M. K. Sullivan, J. Hylen, Ryoji Enomoto, G. R. Lynch, M. P. Cain, Peter Nemethy, W. Gorn, J. W. Gary, F. C. Erné, B. A. Barnett, A. M. Eisner, Werner Hofmann, Kaori Maeshima, G. J. Bobbink, A. R. Clark, Winston Ko, J. R. Smith, K. A. Derby, A. V. Barnes, D. H. Stork, K. H. Kees, J. G. Layter, W. M. Zhang, R. R. Kofler, Orin I. Dahl, Wolfgang Wagner, D. R. Nygren, Marjorie Shapiro, H. Yamamoto, F. R. Rouse, N. Toge, L. Mathis, R. R. McNeil, R. Lander, Toshitsugu Fujii, Mitchell Wayne, J. Thompson, E. S. Miller, K. A. Schwitkis, A. Barbaro-Galtieri, J. C. Sens, D. O. Caldwell, and J. T. White

Subjects
Quark, Quantum chromodynamics, Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, Elementary particle, Jet (particle physics), Nuclear physics, Massless particle, High Energy Physics::Experiment, Event (particle physics)
Abstract

We compare the particle flow in the event plane of three-jet qq-barg (quark-antiquark-gluon) events with the particle flow in radiative annihilation events qq-bar..gamma.. (quark-antiquark-photon) for similar kinematic configurations. In the angular region between quark and antiquark jet, we find a significant decrease in particle density for qq-barg as compared to qq-bar..gamma... This effect is predicted in QCD as a result of destructive interference between soft-gluon radiation from quark, antiquark, and hard gluon.

Published
1986

49. φ- Meson Production ine+e−Annihilations at 29 GeV

Author

W. M. Zhang, W. Moses, R. R. Kofler, J. Chiba, M. T. Ronan, K. K. Kwong, K. A. Derby, B. A. Barnett, Toshitsugu Fujii, J. N. Marx, Orin I. Dahl, H. Aihara, X. Q. Lu, D. L. Fancher, A. Pevsner, M. E. Zeller, A. Cordier, L. Madansky, R. I. Koda, H. Videau, P. R. Robrish, Mitchell Wayne, J. G. Layter, W.A. Wenzel, Gilbert Shapiro, Barry Blumenfeld, M. L. Stevenson, W. Gorn, J. W. Gary, G. J. VanDalen, Margaret Alston-Garnjost, R. van Tyen, Hirotsugu Fujii, Nicholas John Hadley, D. A. Park, Marjorie Shapiro, M. Yamauchi, B. C. Shen, Peter Nemethy, C. T. Day, C. D. Buchanan, A. D. Bross, A. V. Barnes, J. E. Huth, S. C. Loken, J. A. J. Matthews, K. Maruyama, C. S. Lindsey, G. R. Lynch, D. H. Stork, R. R. Sauerwein, R. M. Majka, H. J. Hilke, H. Yamamoto, T. Kamae, C. Y. Chien, D. R. Nygren, H. K. Ticho, J. M. Hauptman, Owen Chamberlain, Werner Hofmann, P. S. Martin, W. E. Slater, F. R. Rouse, P. J. Oddone, Philippe Eberhard, A. Barbaro-Galtieri, R. R. Ross, R. J. Madaras, N. Toge, J. Hylen, M. Pripstein, S. O. Melnikoff, R. W. Kenney, B. Gabioud, H. Iwasaki, A. R. Clark, D. H. Badtke, R. F. van Daalen Wetters, L. T. Kerth, and J. A. Bakken

Subjects
Physics, Particle physics, Annihilation, Meson, Physics::Instrumentation and Detectors, Electron–positron annihilation, Hadron, General Physics and Astronomy, Elementary particle, Phi meson, Nuclear physics, Particle decay, High Energy Physics::Experiment, Boson
Abstract

Production of phi mesons in e/sup +/e/sup -/ annihilation at a center-of-mass energy of 29 GeV has been observed with the time-projection chamber detector at the PEP storage ring. The phi production rate has been measured in the energy range 0.075

Published
1984

50. Evidence for theF*Meson

Author

J. M. Hauptman, K. A. Derby, W. Moses, H. Yamamoto, M. Yamauchi, P. R. Robrish, A. D. Bross, A. Pevsner, A. V. Barnes, D. H. Stork, F. R. Rouse, J. Chiba, R. R. Sauerwein, X. Q. Lu, J. E. Huth, Hiroaki Aihara, J. G. Layter, A. R. Clark, D. H. Badtke, J. A. Bakken, H. S. Kaye, B. A. Barnett, Marjorie Shapiro, M. T. Ronan, A. Barbaro-Galtieri, W. M. Zhang, T. Kamae, R. R. Kofler, K. K. Kwong, J. A. J. Matthews, B. Gabioud, Orin I. Dahl, M. E. Zeller, E. M. Wang, J. N. Marx, Barry Blumenfeld, Margaret Alston-Garnjost, H. Iwasaki, R. van Tyen, M. Pripstein, W. E. Slater, W.A. Wenzel, Gilbert Shapiro, B. C. Shen, J. Hylen, C. D. Buchanan, M. L. Stevenson, Owen Chamberlain, S. C. Loken, Mitchell Wayne, R. M. Majka, C. T. Day, G. J. VanDalen, R. F. van Daalen Wetters, D. R. Nygren, Hirotsugu Fujii, D. A. Park, L. T. Kerth, L. Madansky, R. I. Koda, P. S. Martin, Philippe Eberhard, Ryoji Enomoto, W. Gorn, K. Maruyama, P. J. Oddone, R. R. Ross, R. J. Madaras, H. K. Ticho, Nicholas John Hadley, N. Toge, Peter Nemethy, Toshitsugu Fujii, S. O. Melnikoff, D. L. Fancher, R. W. Kenney, G. R. Lynch, C. Y. Chien, Werner Hofmann, C. S. Lindsey, J. W. Gary, and A. Cordier

Subjects
Physics, Particle physics, Annihilation, Meson, Electron–positron annihilation, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Particle identification, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment, Boson
Abstract

Evidence for a narrow state decaying into an F meson and a photon has been obtained in e/sup +/e/sup -/ annihilation events at 29 GeV c.m. energy. This state lies 139.5 +- 8.3(stat) +- 9.7(syst) MeV above the F-meson mass and is consistent with the expected F( meson. The F mesons are identified by a peak in the K/sup +/K/sup -/..pi../sup + -/ mass at 1.948 +- 0.028 +- 0.010 GeV.

Published
1984

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