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1. Inclusive charged hadron and K0 production in two-photon interactions

Author

J. Boyer, Darien Wood, G. J. Feldman, K. Hayes, D. Herrup, J. A. Jaros, G. H. Trilling, G. S. Abrams, D. Karlen, P. C. Rowson, D. Cords, F. Butler, L. Gladney, N. S. Lockyer, G. Gidal, I. Juricic, M. S. Gold, J. Haggerty, A. M. Boyarski, M. L. Perl, R. A. Ong, K. Riles, Andrew Lankford, R. J. Hollebeek, D. Amidei, B. W. Leclaire, Michael Levi, V. Lüth, Mark E. Nelson, Gordon H. Hanson, J. A. Kadyk, J. M. Yelton, D. L. Burke, W. B. Schmidke, J. M. Dorfan, T. Schaad, H. Schellman, W. R. Innes, Patricia R. Burchat, G. Goldhaber, R. R. Larsen, A. Baden, and T. Barklow

Subjects
Quark, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Pair production, Annihilation, Meson, Hadron, Elementary particle, Production (computer science), Fermion
Abstract

The analogous process to quark pair production in e{sup +} e{sup {minus}} annihilation is the hard-scattering quark exchange process in {gamma}{gamma} interactions. This hard-scattering process is expected to dominate the cross section at high transverse momenta of the produced quarks. Experimentally, one has looked for this process in two-jet as well as inclusive particle production and has found a relatively low PT onset of hard scattering in {gamma}{gamma} interactions. This report examines the issue in more detail (high statistics) for charged particle inclusive production and checks if the heavier flavors display a similar behavior in inclusive K{sup 0} production.

Published
1993
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2. Search for the production of the final statesτ+τ−e+e−,τ+τ−μ+μ−, andτ+τ−π+π−ine+e−collisions at √s=29 GeV

Author

R. R. Larsen, Michael Levi, V. Lüth, S. R. Wagner, B. W. Leclaire, Darien Wood, A. M. Boyarski, J. A. Kadyk, P. D. Sheldon, G. H. Trilling, M. S. Gold, D. P. Stoker, K. Riles, N. S. Lockyer, Gordon H. Hanson, G. Gidal, G. J. Feldman, I. Juricic, G. Goldhaber, Patricia R. Burchat, J. M. Yelton, A. Snyder, D. Karlen, M. L. Perl, L. Golding, K. Hayes, W. R. Innes, Mark E. Nelson, A. Baden, D. Herrup, T. Barklow, R. A. Ong, L. Gladney, P. C. Rowson, H. Schellman, D. Amidei, G. S. Abrams, J. Haggerty, R. J. Hollebeek, F. Butler, M. Petradza, Burton Richter, Andrew Lankford, D. L. Burke, W. B. Schmidke, J. M. Dorfan, J. Boyer, T. Schaad, and J. A. Jaros

Subjects
Physics, Particle physics, Muon, Pion, Meson, Electron–positron annihilation, Hadron, General Physics and Astronomy, Elementary particle, Standard Model, Lepton
Abstract

We have searched for the reaction e+e-, where f is either an electron, muon, or charged pion, at s =29 GeV using the Mark II detector at the SLAC PEP storage ring. One candidate event is found while 2.3 events are expected from known processes. We would expect to see 11 events if the cross section for e+e- at s=29 GeV were enhanced by the factor of 4.7 which the ALEPH Collaboration reports for s=91 GeV. We also look for e+e- and e+e-, and for e+e-, using a similar analysis procedure, and see the number of events predicted by the standard model. © 1992 The American Physical Society.

Published
1992
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3. Search for elastic nondiagonal lepton-pair production ine+e−annihilation at √s=29 GeV

Author

J. J. Gomez-Cadenas, C. A. Heusch, G. Abrams, C. E. Adolphsen, C. Akerlof, J. P. Alexander, M. Alvarez, D. Amidei, A. R. Baden, J. Ballam, B. C. Barish, T. Barklow, B. A. Barnett, J. Bartelt, D. Blockus, G. Bonvicini, A. Boyarski, J. Boyer, B. Brabson, A. Breakstone, J. M. Brom, F. Bulos, P. R. Burchat, D. L. Burke, F. Butler, F. Calvino, R. J. Cence, J. Chapman, D. Cords, D. P. Coupal, H. C. DeStaebler, D. E. Dorfan, J. M. Dorfan, P. S. Drell, G. J. Feldman, E. Fernandez, R. C. Field, W. T. Ford, C. Fordham, R. Frey, D. Fujino, K. K. Gan, G. Gidal, L. Gladney, T. Glanzman, M. S. Gold, G. Goldhaber, L. Golding, A. Green, P. Grosse-Wiesmann, J. Haggerty, G. Hanson, R. Harr, F. A. Harris, C. M. Hawkes, K. Hayes, D. Herrup, T. Himel, M. Hoenk, R. J. Hollebeek, D. Hutchinson, J. Hylen, W. R. Innes, M. Jaffre, J. A. Jaros, I. Juricic, J. A. Kadyk, D. Karlen, J. Kent, S. R. Klein, A. Koide, W. Koska, W. Kozanecki, A. J. Lankford, R. R. Larsen, B. W. LeClaire, M. E. Levi, Z. Li, A. M. Litke, N. S. Lockyer, V. Lüth, C. Matteuzzi, J. A. J. Matthews, D. I. Meyer, B. D. Milliken, K. C. Moffeit, L. Müller, J. Nash, M. E. Nelson, D. Nitz, H. Ogren, R. A. Ong, K. F. O’Shaughnessy, S. I. Parker, C. Peck, A. Petersen, M. Petradza, F. C. Porter, P. Rankin, B. Richter, K. Riles, P. C. Rowson, D. R. Rust, H. F. W. Sadrozinski, T. Schaad, T. L. Schalk, H. Schellman, W. B. Schmidke, A. S. Schwarz, A. Seiden, P. D. Sheldon, J. G. Smith, A. Snyder, E. Soderstrom, D. P. Stoker, R. Stroynowski, R. Thun, G. H. Trilling, R. Tschirhart, C. de la Vaissiere, R. Van Kooten, H. Veltman, P. Voruganti, S. R. Wagner, P. Weber, A. J. Weinstein, A. J. Weir, S. Weisz, S. L. White, E. Wicklund, D. R. Wood, D. Y. Wu, and J. M. Yelton

Subjects
Physics, Particle physics, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, General Physics and Astronomy, Elementary particle, Fermion, Nuclear physics, Pair production, High Energy Physics::Experiment, Production (computer science), Storage ring, Lepton
Abstract

We have searched for the annihilation of e+e- into the exclusive channels e and at s =29 GeV, using 226 and 133 pb-1, respectively, of data taken with the Mark II detector at the SLAC storage ring PEP. The resulting candidate sample is compatible with the expected background from pair production. Our analysis yields 95%-C.L. cross-section limits of e/

Published
1991
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4. Test of QED to fourth order by study of four-lepton final states ine+e−interactions at 29 GeV with the Mark II detector

Author

M. Petradza, R. Thun, G. Abrams, D. Amidei, A. R. Baden, T. Barklow, A. Boyarski, J. Boyer, P. R. Burchat, D. L. Burke, F. Butler, J. M. Dorfan, G. J. Feldman, G. Gidal, L. Gladney, M. S. Gold, G. Goldhaber, J. Haggerty, G. Hanson, K. Hayes, D. Herrup, T. Himel, R. J. Hollebeek, W. R. Innes, J. A. Jaros, J. A. Kadyk, D. Karlen, S. R. Klein, A. J. Lankford, R. R. Larsen, B. W. LeClaire, M. E. Levi, N. S. Lockyer, V. Lüth, M. E. Nelson, R. A. Ong, M. L. Perl, B. Richter, K. Riles, P. C. Rowson, T. Schaad, H. Schellman, W. B. Schmidke, P. D. Sheldon, G. H. Trilling, D. R. Wood, and J. M. Yelton

Subjects
Coupling constant, Physics, Particle physics, Fourth order, Annihilation, Muon, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Elementary particle, Fermion, Lepton
Abstract

We have tested QED to fourth order in the coupling constant {alpha} in the large-{ital Q}{sup 2} region by studying four-lepton final states in {ital e}{sup +}{ital e}{sup {minus}} interactions with the Mark II detector at the SLAC storage ring PEP ({radical}{ital s} =29 GeV). All four final-state particles were detected at large angles with respect to the beam axis. For an integrated luminosity of 205 pb{sup {minus}1}, we observed ten {ital e}{sup +}{ital e}{sup {minus}}{ital e+}{ital e}{sup {minus}}, ten {ital e}{sup +}{ital e}{sup {minus}}{mu}{sup +}{mu}{sup {minus}}, and one {mu}{sup +}{mu}{sup {minus}}{mu}{sup +}{mu}{sup {minus}} events with opposite-charge pair masses greater than 1 GeV/{ital c}{sup 2}. These events show good agreement with the complete {alpha}{sup 4} QED calculation.

Published
1990
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5. Search for a nearly degenerate lepton doublet (L−,L0)

Author

W. B. Schmidke, D. Karlen, J. Dorfan, G. Hanson, A. J. Lankford, A. M. Boyarski, Michael Levi, J. A. Kadyk, H. Schellman, Patricia R. Burchat, J. A. Jaros, N. S. Lockyer, Timothy Barklow, I. Juricic, Mark E. Nelson, L. Golding, R. A. Ong, S. R. Klein, Burton Richter, J. Boyer, R. J. Hollebeek, G. J. Feldman, P. C. Rowson, B. W. Leclaire, G. S. Abrams, D. Herrup, D. L. Burke, R. R. Larsen, P. D. Sheldon, L. Gladney, T. Schaad, Gerson Goldhaber, J. M. Yelton, D. Amidei, A. R. Baden, F. Butler, K. Riles, V. Luth, George Gidal, M. L. Perl, Walter R. Innes, Kenneth G. Hayes, Darien Wood, G. H. Trilling, J. Haggerty, and M. S. Gold

Subjects
Physics, Particle physics, Annihilation, Branching fraction, Computer Science::Information Retrieval, High Energy Physics::Phenomenology, Order (ring theory), Elementary particle, Nuclear physics, Massless particle, High Energy Physics::Experiment, Neutrino, Energy (signal processing), Lepton
Abstract

We have searched for a heavy charged lepton with an associated neutrino of nearly the same mass in {ital e}{sup +}{ital e}{sup {minus}} annihilation data taken with the Mark II detector at a center-of-mass energy of 29 GeV. In order to suppress contamination from conventional two-photon reactions, this analysis uses a novel, radiative-tagging technique. Requiring the presence of an isolated, energetic photon allows a search for lepton doublets with mass splittings smaller than that previously accessible to experiment. No evidence for such a new lepton doublet has been found, enabling limits to be placed on allowed mass combinations. Mass splittings as low as 250--400 MeV/{ital c}{sup 2} are excluded for charged-lepton masses between 500 MeV/{ital c}{sup 2} and 10 GeV/{ital c}{sup 2}.

Published
1990
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6. Two-photon production of pion pairs

Author

Gerson Goldhaber, W. B. Schmidke, Andrew R. Baden, G. H. Trilling, D. Karlen, J. M. Yelton, D. Amidei, J. Haggerty, R. R. Larsen, George Gidal, Cords D, Michael Levi, D. Herrup, G. Hanson, J. A. Kadyk, M. S. Gold, A. J. Lankford, V. Luth, Darien Wood, N. S. Lockyer, I. Juricic, Patricia R. Burchat, H. Schellman, L. Golding, R. A. Ong, Burton Richter, R. J. Hollebeek, J. Boyer, P. D. Sheldon, F. Butler, M. L. Perl, J. Dorfan, Timothy Barklow, A. M. Boyarski, G. S. Abrams, L. Gladney, D. L. Burke, J. A. Jaros, Walter R. Innes, Kenneth G. Hayes, T. Schaad, G. J. Feldman, K. Riles, Mark E. Nelson, P. C. Rowson, and B. W. Leclaire

Subjects
Physics, Particle physics, Unitarity, Meson, Hadron, Elementary particle, Crystallography, Pion, Pair production, Angular distribution, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, High Energy Physics::Experiment, Nuclear Experiment, Boson
Abstract

We present a new high-statistics measurement of the cross section for the process {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{ital e}{sup +}{ital e}{sup {minus}}{pi}{sup +}{pi}{sup {minus}} at a center-of-mass energy of 29 GeV for invariant pion-pair masses {ital M}({pi}{sup +}{pi}{sup {minus}}) between 350 MeV/{ital c}{sup 2} and 1.6 GeV/{ital c}{sup 2}. We observe the {ital f}{sub 2}(1270) and measure its radiative width to be 3.15{plus minus}0.04{plus minus}0.39 keV. We also observe an enhancement in the {pi}{sup +}{pi}{sup {minus}} spectrum near 1 GeV. General agreement is found with unitarized models of the {gamma}{gamma}{r arrow}{pi}{sup +}{pi}{sup {minus}} reaction that include final-state interactions.

Published
1990
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7. Measurement ofK*andK0inclusive rates ine+e−annihilation at 29 GeV

Author

P. C. Rowson, J. M. Yelton, B. W. Leclaire, C. Zaiser, D. Amidei, A. R. Baden, W. R. Innes, D. Schlatter, C. Matteuzzi, G. Hanson, D. Herrup, J. B. Dillon, G. J. Feldman, R. R. Larsen, I. Juricic, L. Golding, R. A. Ong, Gerson Goldhaber, N. S. Lockyer, J. Dorfan, J. A. Jaros, A. M. Boyarski, G. S. Abrams, Michael Levi, M. L. Perl, Timothy Barklow, W. B. Schmidke, H. Schellman, D. L. Burke, M. S. Gold, T. Schaad, Kenneth G. Hayes, C. De La Vaissiere, P. D. Sheldon, Martin Breidenbach, A. J. Lankford, Burton Richter, Mark E. Nelson, V. Luth, T. Himel, Marc Ross, R. J. Hollebeek, F. Butler, George Gidal, K. Riles, D. Karlen, J. A. Kadyk, Darien Wood, J. Boyer, L. Gladney, J. Haggerty, P. R. Burchat, and G. H. Trilling

Subjects
Momentum, Physics, Nuclear physics, Particle physics, Annihilation, Meson, Electron–positron annihilation, Hadron, Elementary particle, Particle identification, Boson
Abstract

We have measured the K/sup 0/+K /sup 0/ inclusive cross section in e/sup +/e/sup -/ annihilation at 29 GeV with the Mark II detector SLAC PEP. We find 1.27 +- 0.03 +- 0.15 K/sup 0/+K /sup 0/ per hadronic event. We have also used time-of-flight particle identification to measure the K/sup + -/ rate over the momentum range 300--900 MeV/c.

Published
1985
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8. Pion pair production fromγγcollisions at the SLACe+e−storage ring PEP

Author

J. A. Kadyk, Mark E. Nelson, D. Schlatter, J. M. Yelton, D. Amidei, Gerson Goldhaber, J. R. Smith, N. S. Lockyer, Martin Breidenbach, C. Matteuzzi, J. Strait, M. L. Perl, G. S. Abrams, L. Gladney, P. C. Rowson, B. W. Leclaire, George Gidal, V. Luth, M. E. B. Franklin, M. W. Eaton, Burton Richter, R. R. Larsen, P. D. Sheldon, C. A. Blocker, J. M. Weiss, L. Golding, J. B. Dillon, C. De La Vaissiere, A. J. Lankford, J. Dorfan, A. D. Johnson, Michael Levi, A. M. Boyarski, J. F. Patrick, J. A. Jaros, Roy F Schwitters, H. Schellman, M. S. Gold, C. Zaiser, W. E. Dieterle, D. L. Burke, T. Schaad, R. J. Hollebeek, William Chinowsky, G. J. Feldman, W. R. Innes, and G. Hanson

Subjects
Quantum chromodynamics, Nuclear physics, Physics, Particle physics, Pion, Pair production, Meson, Hadron, Elementary particle, Storage ring, Boson
Abstract

We have studied several features of the production of charged-hadron pairs by ..gamma gamma.. collisions. We have measured the f/sup 0/ partial width GAMMA/sub f//sup 0/..--> gamma gamma..(Q/sup 2/) for Q/sup 2/ in the range 0 gamma gamma.. = 2.52 +- 0.13 +- 0.38 keV at Q/sup 2/roughly-equal0. The measured Q/sup 2/ dependence is in agreement with the generalized vector-dominance model. The cross section for ..gamma gamma -->..(..pi../sup +/..pi../sup -/+K/sup +/K/sup -/) in the mass region 1.6< or =M/sub pipi/< or =2.5 GeV/c/sup 2/ has also been measured and the result compared with that expected from the QCD continuum.

Published
1984
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9. Study of noncollinear two-charged-particle events produced in 29-GeV electron-positron annihilation

Author

D. Herrup, G. S. Abrams, J. M. Yelton, L. Müller, D. Amidei, A. R. Baden, P. C. Rowson, B. W. Leclaire, C. Zaiser, J. A. Kadyk, Martin Breidenbach, Burton Richter, M. K. Gold, Gerson Goldhaber, D. Schlatter, J. Dorfan, C. Matteuzzi, D. Karlen, Kenneth G. Hayes, A. M. Boyarski, R. R. Larsen, N. S. Lockyer, R. J. Hollebeek, R. A. Ong, L. Golding, W. B. Schmidke, G. Hanson, C. De La Vaissiere, D. L. Burke, V. Luth, T. Schaad, Michael Levi, P. D. Sheldon, J. A. Jaros, Marc Ross, Mark E. Nelson, Timothy Barklow, H. Schellman, Darien Wood, G. J. Feldman, I. Juricic, F. Butler, J. Haggerty, M. L. Perl, Walter R. Innes, K. Riles, George Gidal, J. Boyer, A. J. Lankford, Patricia R. Burchat, and L. Gladney

Subjects
Nuclear physics, Massless particle, Physics, Annihilation, Muon, Pair production, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Electron–positron annihilation, Elementary particle, Atomic physics, Charged particle, Lepton
Abstract

This paper presents a study of events produced in 29-GeV electron-positron annihilation in which there are just two noncollinear charged particles, no detected photons, and two or more undetected particles. These events can be explained by attributing them primarily to the reactions e/sup +/e/sup -/..-->..e/sup +/e/sup -/e/sup +/e/sup -/ and e/sup +/e/sup -/..-->..e/sup +/e/sup -/..mu../sup +/..mu../sup -/ where just two particles appear in the Mark II detector. There is no evidence for unconventional sources for such events.

Published
1986
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10. D*+Production ine+e−Annihilation at 29 GeV

Author

C. Matteuzzi, Andrew Lankford, H. Schellman, G. J. Feldman, M. Franklin, C. A. Blocker, G. Zhao, J. M. Weiss, A. Roussarie, G. H. Trilling, A. D. Johnson, Martin Breidenbach, J. L. Siegrist, Gordon H. Hanson, Michael Levi, A. M. Boyarski, V. Lüth, A. Blondel, M. L. Perl, C. Zaiser, R. J. Hollebeek, Roy F Schwitters, G. Gidal, D. Schlatter, L. Golding, G. S. Abrams, Mark E. Nelson, Adam S. Backer, J. B. Dillon, D. Amidei, J. M. Yelton, B. W. Leclaire, L. Gladney, M. W. Eaton, J. F. Patrick, N. S. Lockyer, M. Werlen, G. von Dardel, J. A. Jaros, J. A. Kadyk, W. E. Dieterle, W. R. Innes, Burton Richter, D. L. Burke, J. M. Dorfan, T. Schaad, G. Goldhaber, J. Dorenbosch, R. R. Larsen, R. A. Vidal, J. Strait, B. Löhr, W. Chinowsky, and Yihua Wang

Subjects
Quark, Physics, Particle physics, Annihilation, Meson, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Parton, Elementary particle, Nuclear physics, Fragmentation function, High Energy Physics::Experiment, Nuclear Experiment, Boson
Abstract

The production of the charmed meson state D*+ has been observed in e+e- annihilation at 29 GeV. The fragmentation function for charmed quarks appears to be peaked about z=0.5. © 1982 The American Physical Society.

Published
1982
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11. Measurement of single and double radiative low-Q2Bhabha scattering atEc.m.=29GeV

Author

K. Hayes, D. Herrup, R. R. Larsen, Michael Levi, V. Lüth, M. L. Perl, M. S. Gold, L. Golding, G. H. Trilling, B. W. Leclaire, G. S. Abrams, W. R. Innes, G. Gidal, R. A. Ong, Andrew Lankford, G. J. Feldman, Gordon H. Hanson, G. Goldhaber, A. Baden, A. M. Boyarski, T. Barklow, P. C. Rowson, J. Boyer, J. Haggerty, I. Juricic, D. Karlen, J. A. Kadyk, J. A. Jaros, R. J. Hollebeek, L. Gladney, N. S. Lockyer, F. Butler, Darien Wood, Patricia R. Burchat, Mark E. Nelson, D. Amidei, H. Schellman, S. R. Klein, J. M. Yelton, P. D. Sheldon, K. Riles, D. L. Burke, W. B. Schmidke, J. M. Dorfan, T. Schaad, and Burton Richter

Subjects
Physics, Nuclear physics, Elastic scattering, Scattering, Monte Carlo method, Radiative transfer, High Energy Physics::Experiment, Elementary particle, Electron, Inelastic scattering, Bhabha scattering
Abstract

The process e/sup +/e/sup -/..-->..e/sup +/e/sup -/..gamma..(..gamma..), where one electron scatters at a small angle, is studied with data from the Mark II detector at the SLAC storage ring PEP. The data are in excellent agreement with a Monte Carlo calculation and include a large contribution from order ..cap alpha../sup 4/. The ratio of measured to calculated cross sections is R = 0.993 +- 0.017 +- 0.015, where the first error is statistical and the second systematic. This is a sensitive test of the calculation of the dominant background for neutrino-counting experiments.

Published
1989
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12. Measurement of theD0andD+lifetimes

Author

D. L. Burke, M. L. Perl, Walter R. Innes, D. Karlen, T. Schaad, G. S. Abrams, Kenneth G. Hayes, D. Herrup, W. B. Schmidke, L. Gladney, Burton Richter, Gerson Goldhaber, A. J. Lankford, M. Levi, J. Haggerty, Martin Breidenbach, Patricia R. Burchat, R. R. Larsen, J. Dorfan, Darien Wood, A. M. Boyarski, J. M. Yelton, D. Amidei, A. R. Baden, J. A. Jaros, P. C. Rowson, B. W. Leclaire, M. K. Gold, C. Zaiser, George Gidal, V. Luth, I. Juricic, P. D. Sheldon, J. Boyer, H. Schellman, C. De La Vaissiere, Timothy Barklow, Mark E. Nelson, F. Butler, K. Riles, L. Golding, Marc Ross, N. S. Lockyer, R. J. Hollebeek, G. J. Feldman, C. Matteuzzi, R. A. Ong, George H. Trilling, J. A. Kadyk, and G. Hanson

Subjects
Physics, Nuclear physics, Annihilation, Meson, Electron–positron annihilation, Hadron, Elementary particle, Atomic physics, Particle detector, Bhabha scattering, Boson
Abstract

We have used a high-resolution drift chamber in the Mark II detector at the SLAC e+e- storage ring PEP to measure the lifetimes of the D0 and D+ mesons produced in e+e- annihilations at 29 GeV. Based on a sample of 74 decays for the D0 mesons and 23 decays for the D+ mesons, the lifetimes are found to be &=(4.7-0.8+0.9) 0.5×10-13 sec and &=(8.9-2.7+3.8) 1.3×10-13 sec. This leads to a ratio of lifetimes &=1.9-0.7 0.3+0.9.. AE © 1986 The American Physical Society.

Published
1986
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13. Observation of spin-1f1(1285) in the reaction γγ*→η0π+π−

Author

D. Amidei, G. Goldhaber, D. L. Burke, R. J. Hollebeek, C. Zaiser, W. B. Schmidke, L. Golding, J. M. Dorfan, Patricia R. Burchat, G. J. Feldman, A. Baden, T. Schaad, T. Barklow, R. A. Ong, R. R. Larsen, D. Karlen, J. Boyer, P. C. Rowson, G. S. Abrams, M. S. Gold, Juricic I I, J. Haggerty, K. Riles, N. S. Lockyer, Andrew Lankford, P. D. Sheldon, M. L. Perl, Gordon H. Hanson, L. Gladney, J. A. Jaros, B. W. Leclaire, Klein, Mark E. Nelson, de la Vaissiere C, D. Herrup, D. Cords, G. H. Trilling, F. Butler, Darien Wood, W. R. Innes, Lüth, J. A. Kadyk, A. M. Boyarski, K. Hayes, C. Matteuzzi, G. Gidal, Michael Levi, J. M. Yelton, H. Schellman, and Burton Richter

Subjects
Physics, Particle decay, Pion, Meson, Hadron, Analytical chemistry, Mass spectrum, General Physics and Astronomy, Elementary particle, Atomic physics, Spectral line, Particle identification
Abstract

We observe both the J/sup P//sup C/ = 1/sup + +/ f/sub 1/(1285) and the J/sup P//sup C/ = 0/sup - +/ eta'(958) in tagged two-photon interactions and the eta'(958) in untagged interactions. The measured Q/sup 2/ dependence and decay distribution support the f/sub 1/(1285) spin and parity assignment. The radiative width of the f/sub 1/(1285) is measured as (M/sup 2//Q/sup 2/)GAMMA/sub ..gamma..//sub ..gamma..//sub */ = 9.4 +- 2.5 +- 1.7 keV, on the assumption of a rho-pole form factor.

Published
1987
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14. Precise Measurement ofτ-Decay Charged-Particle Multiplicity Distribution

Author

M. L. Perl, N. S. Lockyer, M. Franklin, A. D. Johnson, Martin Breidenbach, C. A. Blocker, H. Schellman, W. E. Dieterle, G. J. Feldman, L. Golding, Larry D. Gladney, A. M. Boyarski, J. B. Dillon, D. Amidei, R. R. Larsen, C. Zaiser, Walter R. Innes, R. A. Vidal, B. Löhr, R. J. Hollebeek, D. Schlatter, W. Chinowsky, G. Zhao, Yihua Wang, V. Lüth, C. Matteuzzi, D. L. Burke, J. L. Siegrist, J. Strait, A. Bäcker, J. M. Yelton, G. H. Trilling, A. Blondel, Michael Levi, J. M. Dorfan, Roy F Schwitters, T. Schaad, M. W. Eaton, B. W. Leclaire, A. Roussarie, M. Werlen, J. A. Kadyk, G. von Dardel, G. Goldhaber, J. A. Jaros, Burton Richter, G. S. Abrams, J. F. Patrick, J. Dorenbosch, Andrew Lankford, Gordon H. Hanson, Mark E. Nelson, J. M. Weiss, and G. Gidal

Subjects
Physics, Nuclear physics, Annihilation, Pair production, Branching fraction, General Physics and Astronomy, Multiplicity (mathematics), Elementary particle, Charged particle, Storage ring, Lepton
Abstract

The charged-particle multiplicity distribution in decays is determined from data collected at the e+e- storage ring PEP. The one-, three-, and five-charged-particle inclusive branching fractions are (86 ± 2)%, (14 ± 2)%, and < 0.5%, respectively. © 1982 The American Physical Society.

Published
1982
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15. Charged-meson pair production ingammaγinteractions

Author

J. Boyer, D. L. Burke, F. Butler, G. Gidal, G. S. Abrams, D. Amidei, A. R. Baden, T. Barklow, A. M. Boyarski, M. Breidenbach, P. Burchat, J. M. Dorfan, G. J. Feldman, L. Gladney, M. S. Gold, G. Goldhaber, L. J. Golding, J. Haggerty, G. Hanson, K. Hayes, D. Herrup, R. J. Hollebeek, W. R. Innes, J. A. Jaros, I. Juricic, J. A. Kadyk, D. Karlen, S. R. Klein, A. J. Lankford, R. R. Larsen, B. W. LeClaire, M. E. Levi, N. S. Lockyer, V. Lüth, C. Matteuzzi, M. E. Nelson, R. A. Ong, M. L. Perl, B. Richter, K. Riles, M. C. Ross, P. C. Rowson, T. Schaad, H. Schellman, W. B. Schmidke, P. D. Sheldon, J. R. Smith, G. H. Trilling, C. de la Vaissiere, D. R. Wood, J. M. Yelton, and C. Zaiser

Subjects
Nuclear physics, Physics, Quantum chromodynamics, Particle physics, Pair production, Annihilation, Pion, Meson, Hadron, General Physics and Astronomy, Elementary particle, Charged particle
Abstract

The cross section for the production of ..pi../sup +/..pi../sup -/ or K/sup +/K/sup -/ pairs in ..gamma gamma.. interactions is measured for m/sub pipi/ between 1.7 and 3.5 GeV/c/sup 2/ and for two intervals of ..gamma gamma.. center-of-mass scattering angle. Results are compared with predictions of a QCD model.

Published
1986
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16. Precise Measurement of the Tau Lifetime

Author

Andrew Lankford, J. Dorfan, A. M. Boyarski, H. Schellman, G. G. Hanson, M. E. Levi, C. Zaiser, P. D. Sheldon, G. H. Trilling, D. L. Burke, V. Luth, D. Schlatter, Martin Breidenbach, T. Schaad, J. A. Jaros, C. Hoard, J. A. Kadyk, J. Strait, Burton Richter, R. J. Hollebeek, George Gidal, John Yelton, G. Goldhaber, D. Amidei, B. W. Leclaire, P. C. Rowson, C. Matteuzzi, W. R. Innes, G. J. Feldman, L. Golding, R. A. Ong, G. S. Abrams, M. S. Gold, N. S. Lockyer, C. A. Blocker, Mark E. Nelson, R. R. Larsen, L. Gladney, C. De La Vaissiere, and M. L. Perl

Subjects
Physics, Elastic scattering, Particle decay, Scattering, Branching fraction, Quantum electrodynamics, General Physics and Astronomy, Elementary particle, Fermion, Quantum field theory, Lepton
Abstract

The τ lifetime was measured with the Mark II vertex detector at the storage ring PEP. ττ=(3.20±0.41±0.35)×10-13 sec was found, which agrees well with e-μ-τ university. © 1983 The American Physical Society.

Published
1983
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17. Measurement of the Lifetime of Bottom Hadrons

Author

C. A. Blocker, C. Matteuzzi, N. S. Lockyer, D. Herrup, A. Baden, I. Juricic, Gordon H. Hanson, C. De La Vaissiere, Michael Levi, D. Schlatter, V. Lüth, Andrew Lankford, M. S. Gold, L. Golding, R. J. Hollebeek, M. L. Perl, G. H. Trilling, M. Jonker, G. S. Abrams, R. A. Ong, Mark E. Nelson, G. Gidal, G. J. Feldman, W. R. Innes, G. Goldhaber, P. C. Rowson, J. Strait, P. D. Sheldon, M. C. Ross, D. Amidei, C. Zaiser, Burton Richter, Patricia R. Burchat, D. L. Burke, R. R. Larsen, J. M. Dorfan, T. Schaad, Martin Breidenbach, J. A. Jaros, A. M. Boyarski, H. Schellman, B. W. Leclaire, J. A. Kadyk, J. M. Yelton, and L. Gladney

Subjects
Physics, Nuclear physics, Baryon, Particle decay, Particle physics, Meson, Branching fraction, General Physics and Astronomy, Elementary particle, Fermion, Storage ring, Lepton
Abstract

The average lifetime of bottom hadrons was measured with the Mark II vertex detector at the storage ring PEP. The lifetime was determined by measuring the impact parameters of leptons produced in bottom decays. τb=(12.0-3.6+4. 5±3.0)×10-13 sec was found. © 1983 The American Physical Society.

Published
1983
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18. Measurement of Energy Correlations ine+e−→Hadrons

Author

B. W. Leclaire, Burton Richter, M. W. Coles, R. R. Larsen, D. L. Burke, J. M. Dorfan, G. von Dardel, T. Schaad, G. Goldhaber, J. Dorenbosch, J. A. Jaros, M. L. Perl, W. E. Dieterle, R. J. Hollebeek, G. H. Trilling, N. S. Lockyer, Adam S. Backer, Gordon H. Hanson, G. Zhao, D. Schlatter, Andrew Lankford, J. L. Siegrist, Larry D. Gladney, C. A. Blocker, V. Lüth, G. J. Feldman, Walter R. Innes, L. Golding, A. Roussarie, D. L. Scharre, J. M. Yelton, G. S. Abrams, R. A. Vidal, M. W. Eaton, A. D. Johnson, Martin Breidenbach, J. B. Dillon, C. Zaiser, D. Amidei, I. Videau, J. Strait, M. Werlen, B. Löhr, Mark E. Nelson, J. F. Patrick, M. Franklin, A. Blondel, J. M. Weiss, J. A. Kadyk, G. Gidal, A. M. Boyarski, Michael Levi, Roy F Schwitters, C. Matteuzzi, W. Chinowsky, Yihua Wang, and H. Schellman

Subjects
Quantum chromodynamics, Physics, Coupling constant, Particle physics, Annihilation, Detector, Hadron, General Physics and Astronomy, Elementary particle, Linear particle accelerator, Nuclear physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Storage ring
Abstract

Energy correlations have been measured with the MARK II detector at the PEP storage ring (Stanford Linear Accelerator Center) at c.m. energy of 29 GeV and are compared to first-order QCD predictions. Fragmentation processes are significant and limit the precision with which the first-order strong-coupling constant can be determined. © 1982 The American Physical Society.

Published
1982
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19. Measurement of the Branching Fraction forτ−→5π±(π0)ντand an Upper Limit on theντMass

Author

A. Baden, J. Haggerty, T. Barklow, D. Amidei, P. D. Sheldon, C. De La Vaissiere, H. Schellman, L. Golding, I. Juricic, Gordon H. Hanson, C. Matteuzzi, P. C. Rowson, D. Karlen, R. A. Ong, R. J. Hollebeek, G. Gidal, G. H. Trilling, M. S. Gold, M. L. Perl, V. Lüth, John Yelton, M. C. Ross, K. Riles, Mark E. Nelson, N. S. Lockyer, J. Boyer, Darien Wood, G. Goldhaber, G. J. Feldman, Martin Breidenbach, Andrew Lankford, J. A. Jaros, L. Gladney, D. Herrup, G. S. Abrams, F. Butler, M. E. Levi, Patricia R. Burchat, R. R. Larsen, Burton Richter, A. M. Boyarski, B. W. Leclaire, D. L. Burke, W. R. Innes, W. B. Schmidke, J. M. Dorfan, T. Schaad, J. A. Kadyk, K. Hayes, and C. Zaiser

Subjects
Semileptonic decay, Physics, Particle decay, Pion, Meson, Branching fraction, Hadron, Analytical chemistry, General Physics and Astronomy, Elementary particle, Lepton
Abstract

The branching fraction for tau/sup -/..-->..5..pi../sup + -/(..pi../sup 0/)..nu../sub tau/ is measured from data accumulated with the Mark II detector at PEP. Four events are observed with an estimated hadronic background of (0.03/sub -0.02//sup +0.04/) events and a background from tau/sup -/..-->..e..pi../sup + -/..pi../sup 0/..nu../sub tau/ of (0.05/sub -0.04//sup +0.07/) events. This results in a measured branching fraction of (0.16 +- 0.08 +- 0.04)%. The candidate events are used to establish an upper limit of 125 MeV/c/sup 2/ on the ..nu../sub tau/ mass at the 95% confidence level.

Published
1985
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20. Bose-Einstein correlations ine+e−collisions

Author

I. Juricic, G. Goldhaber, G. Gidal, G. Abrams, D. Amidei, A. R. Baden, J. Boyer, F. Butler, W. C. Carithers, M. S. Gold, L. Golding, J. Haggerty, D. Herrup, J. A. Kadyk, M. E. Levi, M. E. Nelson, P. C. Rowson, H. Schellman, W. B. Schmidke, P. D. Sheldon, G. H. Trilling, D. R. Wood, T. Barklow, A. Boyarski, M. Breidenbach, P. Burchat, D. L. Burke, D. Cords, J. M. Dorfan, G. J. Feldman, L. Gladney, G. Hanson, K. Hayes, D. G. Hitlin, R. J. Hollebeek, W. R. Innes, J. A. Jaros, D. Karlen, S. R. Klein, A. J. Lankford, R. R. Larsen, B. W. LeClaire, N. S. Lockyer, V. Lüth, R. A. Ong, M. L. Perl, B. Richter, K. Riles, M. C. Ross, R. H. Schindler, J. M. Yelton, T. Schaad, and R. F. Schwitters

Subjects
Nuclear physics, Quantum chromodynamics, Physics, Particle physics, Pion, Pair production, Annihilation, Meson, Hadron, High Energy Physics::Experiment, Elementary particle, Quarkonium
Abstract

The MARK II detector is used to study the Bose-Einstein correlation between pairs and triplets of charged pions produced in hadronic decays of the J)psi), the ..sqrt..s = 4 to 7 GeV continuum above the J)psi), two photon events at ..sqrt..s = 29 GeV, and e/sup )plus/)e/sup )minus/) annihilation events at ..sqrt..s = 29 GeV as a function of Q/sup 2/, the four-momentum transfer squared. After corrections for Coulomb effects and pion misidentification, we find a nearly full Bose-Einstein enhancement ..cap alpha.. in the J)psi) and the two photon data and about half the maximum value in the other two data sets. The radius parameter )tau)(an average over space and time) given by pion pair analyses lies within a band of +-0.10 fm around 0.73 fm and is the same, within errors, for all four data sets. Pion triplet analyses also give a consistent radius of approx. 0.54 fm. fits to two-dimensional distributions R(q/sub T//sup 2/, q/sub C//sup 2/) of invariant components of Q/sup 2/ = q/sub T//sup 2/ )plus) q/sub C//sup 2/ give )tau)/sub T/ approx. )tau)C approx. )tau), where q/sub T/ is the transverse three-momentum difference calculated with respect to the net pair three-momentum, and q/sub C/ ismore » in effect the longitudinal three-momentum difference in the pion pair rest frame. When q/sub T/ is calculated with respect to the jet axis for two-jet events in the e/sup )plus/)e/sup )minus/) annihilation data at ..sqrt..s = 29 GeV, a fit to R(q/sub T//sup 2/, q/sub C//sup 2/) also gives )tau)/sub T/ approx. )tau)/sub C/ approx. )tau). Noting that q/sub L/ and q/sub 0/ are not invariant, we make fits to R(/sub T//sup T/, q/sub L//sup 2/) and to R(q/sub T//sup 2/, q/sub 0//sup 2/) (Kopylov formulation), and we find )tau)/sub 0/ approx. )tau)/sub L/ approx. )23))tau)/sub T/ to )12))tau)/sub T/. 44 refs., 43 figs., 15 tabs« less

Published
1989
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21. Comparison of the particle flow in Three-Jet and radiative Two-Jet Events frome+e−Annihilation atEc.m.=29GeV

Author

R. J. Hollebeek, J. Haggerty, J. A. Kadyk, G. J. Feldman, P. C. Rowson, D. L. Burke, D. Amidei, M. C. Ross, P. R. Burchat, W. B. Schmidke, J. M. Dorfan, L. Golding, K. Riles, R. A. Ong, G. Goldhaber, T. Schaad, H. Schellman, D. Karlen, F. Butler, Andrew Lankford, B. W. Leclaire, J. Boyer, M. L. Perl, M. S. Gold, D. Herrup, A. Baden, T. Barklow, A. M. Boyarski, A. Petersen, W. R. Innes, J. A. Jaros, G. H. Trilling, C. Matteuzzi, N. S. Lockyer, P. D. Sheldon, R. R. Larsen, Juricic I I, Darien Wood, L. Gladney, G. Gidal, Zaiser aC, de la Vaissiere C, Mark E. Nelson, Burton Richter, Lüth, G. S. Abrams, Gordon H. Hanson, Michael Levi, John Yelton, and K. Hayes

Subjects
Quark, Physics, Jet (fluid), Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, General Physics and Astronomy, Elementary particle, Gluon, Nuclear physics, Radiative transfer, High Energy Physics::Experiment, Event (particle physics)
Abstract

We have made a detailed comparison of the charged-particle flow in three-jet events (e+e-qq»g) and radiative two-jet events (e+e-qq») from e+e- annihilation at Ec.m.=29 GeV. Accurate comparisons can be made because these two event types have similar topologies. In the angular region between the quark and antiquark jets, we observe substantially fewer charged tracks in the two-jet events than in the radiative three-jet events. © 1986 The American Physical Society.

Published
1986
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22. Multihadronic events atEc.m.=29 GeV and predictions of QCD models fromEc.m.=29 GeV toEc.m.=93 GeV

Author

B. W. Leclaire, Cords D, John Yelton, Jordan Nash, C. A. Heusch, K. K. Gan, S. Weisz, L. Golding, K. O'Shaughnessy, W. Koska, C. W. Peck, T. Schalk, D. Herrup, E. Fernandez, A. J. Weir, R. J. Hollebeek, Kenneth G. Hayes, P. Voruganti, R. Harr, J. S. Haggerty, D. R. Rust, E. Soderstrom, R. C. Field, K.C. Moffeit, Sherwood Parker, E. Wicklund, Fordham C, Larry D. Gladney, A. Breakstone, R. Frey, C. De La Vaissiere, Darien Wood, B. A. Barnett, Adolphsen Ce, Timothy Barklow, Alan Litke, A. Koide, P. Weber, J. A. Jaros, A. J. Weinstein, John E. Bartelt, M. E. Levi, D.P. Coupal, J. W. Chapman, Stephen Robert Wagner, M. Petradza, R. A. Ong, C. M. Hawkes, A. Snyder, A. Petersen, J. A. J. Matthews, W. Kozanecki, H. O. Ogren, P. S. Drell, D. Amidei, T. Himel, R. R. Larsen, G. S. Abrams, B. B. Brabson, F. Bulos, Ryszard Stroynowski, D. Fujino, M. S. Gold, A. Green, W. T. Ford, A. Seiden, F. Butler, P. Rankin, N. S. Lockyer, DeStaebler Hc, A. S. Schwarz, G. Bonvicini, George Gidal, J. P. Alexander, Mark E. Nelson, F. Calviño, M. Jaffré, M. L. Perl, H. F.W. Sadrozinski, Gerson Goldhaber, I. Juricic, H. Schellman, H. Veltman, R. J. Cence, Z. Li, J. Boyer, Carl W. Akerlof, D. I. Meyer, B. D. Milliken, Grosse-Wiesmann P, F. A. Harris, T. Glanzman, R. Tschirhart, K. Riles, M. Hoenk, S. L. White, D. Nitz, D. Y. Wu, P. D. Sheldon, J. Ballam, J. Hylen, R. Van Kooten, P. R. Burchat, R. P. Thun, D. P. Stoker, A. J. Lankford, B. C. Barish, D. Karlen, J. Kent, Burton Richter, D. Blockus, J. Dorfan, A. M. Boyarski, S. R. Klein, L. Müller, G. J. Feldman, D. L. Burke, T. Schaad, M. Alvarez, W. R. Innes, F. C. Porter, J. A. Kadyk, W. B. Schmidke, G. Hanson, C. Matteuzzi, A. Baden, G. H. Trilling, J. M. Brom, D. Hutchinson, J. G. Smith, D. E. Dorfan, and P. C. Rowson

Subjects
Nuclear physics, Physics, Quantum chromodynamics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Elementary particle, Parton, Rapidity, Hadronization
Abstract

Multihadronic e/sup +/e/sup -/ annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, Q/sub 2/-Q/sub 1/, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, p/sub perpendicular/, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing e/sup +/e/sup -/ data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the Z/sup 0/, are also presented.

Published
1988
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23. Search for Supersymmetric Electrons

Author

L. Gladney, R. J. Hollebeek, B. W. LeClaire, G. S. Abrams, D. Amidei, A. R. Baden, A. M. Boyarski, M. Breidenbach, P. Burchat, F. Butler, D. L. Burke, J. M. Dorfan, G. J. Feldman, G. Gidal, M. S. Gold, G. Goldhaber, L. Golding, G. Hanson, D. Herrup, W. R. Innes, J. A. Jaros, M. Jonker, I. Juricic, J. A. Kadyk, A. J. Lankford, R. R. Larsen, M. Levi, N. S. Lockyer, V. Lüth, C. Matteuzzi, M. E. Nelson, R. A. Ong, B. Richter, M. C. Ross, P. C. Rowson, T. Schaad, H. Schellman, D. Schlatter, P. D. Sheldon, G. H. Trilling, C. de la Vaissiere, J. M. Yelton, and C. Zaiser

Subjects
Nuclear physics, Physics, Particle physics, Scalar (physics), General Physics and Astronomy, Elementary particle, Electron, Fermion, Supersymmetry, Particle identification, Storage ring, Lepton
Abstract

A search for single electrons from the decay of singly produced scalar electrons has been made at the PEP storage ring at SLAC. No events of this type have been found in 123 pb-1 of data, resulting in a cross-section limit of less than 2.4×10-2 pb within the detector acceptance, and a 95%-confidence-level lower limit on the scalar-electron mass of 22.2 GeV/c2. © 1983 The American Physical Society.

Published
1983
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24. ηandη′Production ine+e−Annihilation at 29 GeV. Evidence for theDs±Decays intoηπ±andη′π±

Author

N. S. Lockyer, G. S. Abrams, R. R. Larsen, P. C. Rowson, M. S. Gold, D. Karlen, L. Golding, R. A. Ong, K. Riles, P. D. Sheldon, K. Hayes, G. J. Feldman, F. Butler, A. M. Boyarski, M. L. Perl, G. Goldhaber, Juricic I I, P. R. Burchat, Gordon H. Hanson, J. Boyer, Lüth, D. Herrup, A. Baden, G. Gidal, B. W. Leclaire, D. Amidei, J. A. Jaros, H. Schellman, G. H. Trilling, W. R. Innes, J. S. Haggerty, L. Gladney, J. A. Kadyk, T. Barklow, Mark E. Nelson, Darien Wood, Michael Levi, Burton Richter, R. J. Hollebeek, John Yelton, Klein, D. L. Burke, W. B. Schmidke, J. M. Dorfan, T. Schaad, G. Wormser, and Andrew Lankford

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

eta production has been investigated by the Mark II Collaboration at the SLAC e/sup +/e/sup -/ storage ring PEP. eta particles are reconstructed by their ..gamma gamma.. decay mode. The eta fragmentation function has been measured and found to be in good agreement with the Lund-model prediction. eta' production has been measured for the first time in high-energy e/sup +/e/sup -/ annihilation. There is evidence at the 3sigma level for D/sub s//sup +- / decay into eta..pi../sup +/ and eta'..pi../sup +- /.

Published
1988
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25. Limits on the Production of Pointlike, Charged, Spin-0 Particles ine+e−Annihilations at 29 GeV

Author

M. Franklin, G. S. Abrams, H. Schellman, J. M. Weiss, A. M. Boyarski, C. Matteuzzi, G. Gidal, V. Lüth, G. H. Trilling, J. F. Patrick, R. A. Vidal, M. L. Perl, D. Schlatter, Adam S. Backer, J. M. Yelton, Michael Levi, B. Löhr, L. Golding, Andrew Lankford, R. J. Hollebeek, W. E. Dieterle, A. Blondel, Roy F Schwitters, C. A. Blocker, Walter R. Innes, Mark E. Nelson, Larry D. Gladney, G. Zhao, A. Roussarie, J. L. Siegrist, G. J. Feldman, N. Lockyer, G. von Dardel, G. Goldhaber, R. R. Larsen, J. B. Dillon, J. A. Jaros, D. Amidei, M. W. Eaton, M. Werlen, Gordon H. Hanson, A. D. Johnson, Martin Breidenbach, C. Zaiser, W. Chinowsky, J. Strait, Yihua Wang, D. L. Burke, J. M. Dorfan, T. Schaad, Burton Richter, J. Dorenbosch, J. A. Kadyk, and B. W. Leclaire

Subjects
Physics, Particle physics, Branching fraction, General Physics and Astronomy, Elementary particle, Linear particle accelerator, Charged particle, Massless particle, Nuclear physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Boson, Spin-½, Lepton
Abstract

A search for charged, pointlike, spin-0 particles with large couplings to the τ lepton has been done at the PEP e+e- storage ring (Stanford Linear Accelerator Center). No evidence for such particles is seen, and limits are placed on the branching fraction to τντ as a function of mass. © 1982 The American Physical Society.

Published
1982
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26. Measurement of theD0Lifetime

Author

J. Boyer, P. C. Rowson, L. Gladney, L. Golding, J. A. Jaros, P. D. Sheldon, G. S. Abrams, Andrew Lankford, Michael Levi, R. A. Ong, B. W. Leclaire, W. R. Innes, V. Lüth, G. H. Trilling, C. Zaiser, J. A. Kadyk, G. J. Feldman, Gordon H. Hanson, D. L. Burke, I. Juricic, D. Schlatter, Darien Wood, F. Butler, M. L. Perl, N. S. Lockyer, C. De La Vaissiere, W. B. Schmidke, J. M. Dorfan, G. Gidal, Mark E. Nelson, T. Schaad, C. Matteuzzi, M. C. Ross, D. Amidei, R. J. Hollebeek, J. M. Yelton, D. Herrup, A. M. Boyarski, Burton Richter, Patricia R. Burchat, H. Schellman, R. R. Larsen, M. S. Gold, Martin Breidenbach, G. Goldhaber, and A. Baden

Subjects
Physics, Nuclear physics, Particle decay, Annihilation, Pion, Meson, Hadron, General Physics and Astronomy, Elementary particle, Measure (mathematics)
Abstract

We have used an electronic tracking system to measure the lifetime of D0 mesons produced in e+e- annihilation at 29 GeV. Based on a sample of 27 events, the lifetime is found to be (4.2-1.0+1.3 1.0) × 10-13 s. © 1984 The American Physical Society.

Published
1984
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27. Search for Monojet Production ine+e−annihilation

Author

Martin Breidenbach, Kenneth G. Hayes, K. Riles, B. W. Leclaire, Burton Richter, M. E. Levi, M.C. Ross, W. R. Innes, M. S. Gold, Patricia R. Burchat, N. S. Lockyer, J. Dorfan, A. M. Boyarski, H. Schellman, I. Juricic, D. Amidei, C. Zaiser, P. D. Sheldon, A. J. Lankford, G. J. Feldman, D. Schlatter, D. L. Burke, F. Butler, Darien Wood, M. L. Perl, V. Luth, R. R. Larsen, Mark E. Nelson, W. B. Schmidke, A. Baden, R. J. Hollebeek, P. C. Rowson, T. Schaad, G. G. Hanson, D. Karlen, L. Gladney, C. Matteuzzi, J. A. Jaros, George Gidal, C. De La Vaissiere, J. Boyer, John Yelton, G. Goldhaber, L. Golding, Timothy Barklow, J. A. Kadyk, J. Haggerty, R. A. Ong, G. S. Abrams, and D. Herrup

Subjects
Quark, Nuclear physics, Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, Higgs boson, General Physics and Astronomy, High Energy Physics::Experiment, Elementary particle, Production (computer science), Boson
Abstract

We report results of a search for events of the type e+e-jet+missing transverse momentum using the Mark II detector at PEP. Two candidate events were found, but both could come from known sources of background. A specific model for the origin of UA1 monojet events as the decay of a Z boson into two light Higgs bosons is eliminated by this search. © 1985 The American Physical Society.

Published
1985
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28. Refined measurement of the B-hadron lifetime

Author

G. H. Trilling, P. D. Sheldon, G. Gidal, D. Herrup, D. Karlen, J. M. Yelton, G. Goldhaber, L. Golding, I. Juricic, R. A. Ong, J. Haggerty, K. Riles, M. S. Gold, Michael Levi, V. Lüth, G. S. Abrams, K. Hayes, A. Baden, N. S. Lockyer, Andrew Lankford, T. Barklow, H. Schellman, G. J. Feldman, F. Butler, L. Gladney, J. Boyer, S. R. Klein, A. Petersen, J. A. Jaros, Mark E. Nelson, P. C. Rowson, W. R. Innes, Gordon H. Hanson, D. Amidei, R. J. Hollebeek, Darien Wood, Patricia R. Burchat, R. R. Larsen, A. M. Boyarski, J. A. Kadyk, B. W. Leclaire, D. L. Burke, W. B. Schmidke, J. M. Dorfan, T. Schaad, and Burton Richter

Subjects
Quark, Physics, Particle physics, Meson, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Elementary particle, Fermion, Nuclear physics, High Energy Physics::Experiment, B meson, Nuclear Experiment, Lepton
Abstract

We report a new measurement of the average lifetime of hadrons containing bottom quarks. The B-hadron decays are tagged by identifying leptons at high transverse momentum. From a fit to the lepton impact-parameter distribution, the average B-hadron lifetime is found to be (0.98 0.12 0.13)×10-12 sec. © 1989 The American Physical Society.

Published
1989

29. Charged multiplicity of hadronic events containing heavy-quark jets

Author

A. Baden, L. Golding, T. Barklow, R. A. Ong, C. Matteuzzi, H. Schellman, B. W. Leclaire, C. Zaiser, C. De La Vaissiere, N. S. Lockyer, J. M. Yelton, R. R. Larsen, R. J. Hollebeek, P. D. Sheldon, G. S. Abrams, W. R. Innes, D. Karlen, A. M. Boyarski, Burton Richter, Martin Breidenbach, P. C. Rowson, K. Riles, D. Schlatter, Darien Wood, J. Haggerty, J. A. Kadyk, M. E. Levi, Patricia R. Burchat, M. S. Gold, G. J. Feldman, G. H. Trilling, D. L. Burke, K. Hayes, I. Juricic, Andrew Lankford, W. B. Schmidke, J. M. Dorfan, M. C. Ross, D. Amidei, T. Schaad, D. Herrup, J. Boyer, Mark E. Nelson, Gordon H. Hanson, J. A. Jaros, G. Goldhaber, G. Gidal, M. L. Perl, V. Lüth, L. Gladney, and F. Butler

Subjects
Quark, Semileptonic decay, Physics, Particle physics, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Elementary particle, Charm quark, Nuclear physics, Particle decay, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The charged-particle multiplicities of hadronic events deriving from produced bottom or charm quarks have been measured in the Mark II detector at PEP in e+e- annihilation at 29 GeV. For events containing one semileptonic and one hadronic weak decay, we find multiplicities of 15.20.50.7 for bottom and 13.00.50.8 for charm. The corresponding multiplicities of charged particles accompanying the pair of heavy hadrons are 5.20.50.9 for bottom, and 8.10.50.9 for charm. © 1985 The American Physical Society.

Published
1985

30. Searches for unstable neutral leptons in low-multiplicity events from electron-positron annihilation

Author

D. Karlen, J. Boyer, P. C. Rowson, John Yelton, H. Schellman, Luth, George Gidal, A. Baden, Martin Breidenbach, J. Dorfan, A. M. Boyarski, L. Golding, K. Riles, M.C. Ross, M. L. Perl, B. W. Leclaire, G. G. Hanson, D. L. Burke, Kenneth G. Hayes, R. A. Ong, W. B. Schmidke, P. D. Sheldon, D. Amidei, C. Zaiser, de la Vaissiere C, M. S. Gold, J. A. Jaros, R. J. Hollebeek, T. Schaad, G. S. Abrams, Mark E. Nelson, A. J. Lankford, C. Matteuzzi, Burton Richter, M. E. Levi, Patricia R. Burchat, G. J. Feldman, L. Gladney, Juricic I I, R. R. Larsen, D. Schlatter, Darien Wood, W. R. Innes, N. S. Lockyer, F. Butler, G. Goldhaber, Timothy Barklow, D. Herrup, J. A. Kadyk, and J. Haggerty

Subjects
Physics, Particle physics, Annihilation, Branching fraction, Electron–positron annihilation, Astrophysics::High Energy Astrophysical Phenomena, Elementary particle, Fermion, Particle identification, Nuclear physics, Particle decay, High Energy Physics::Experiment, Nuclear Experiment, Lepton
Abstract

Upper limits are given on the production of unstable neutral leptons in electron-positron annihilation at 29 GeV. The searches use selected two- and four-charged-particle events and are most sensitive to neutral-lepton masses of the order of 1 GeV/c2 and smaller. However, results are given for masses up to 14 GeV/c2. © 1985 The American Physical Society.

Published
1985
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