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1. Results on two-photon interactions from Mark II at spear

Author

G. Goldhaber, J. F. Patrick, V. I. Telnov, R. E. Millikan, J. Dorfan, A. M. Boyarski, J. A. Jaros, R. H. Schindler, J. A. Kadyk, W. E. Dieterle, Martin Breidenbach, R. A. Vidal, A. D. Johnson, S. Cooper, A. J. Lankford, D. G. Hitlin, D. L. Scharre, R. R. Larsen, D. L. Burke, R. F. Schwitters, M. W. Eaton, James Strait, G. H. Trilling, Kenneth G. Hayes, A. Roussarie, M. S. Alam, Burton Richter, V. Ldth, H. Taureg, J. L. Siegrist, T. Himel, George Gidal, M. E. B. Franklin, M. W. Coles, P. Jenni, E. Vella, J. M. Weiss, M. L. Perl, C. Y. Pang, R. J. Hollebeek, I. Videau, H. Zaccone, William Chinowsky, M. Tonutti, W. R. Innes, W. Carithers, J. B. Dillon, G. S. Abrams, J. Dorenbosch, G. J. Feldman, G. G. Hanson, C. A. Blocker, and Mark E. Nelson

Subjects
Physics, Nuclear physics, Particle decay, Range (particle radiation), Meson, Hadron, Radiative transfer, Elementary particle, Magnetic detector, Atomic physics, Boson
Abstract

Two-photon interactions have been studied with the SLAC-LBL Mark II magnetic detector at SPEAR. The cross-section for η′ production by the reaction e+e− → e+e−η′ has been measured over the beam energy range from 2 to 4 GeV. The radiative width Tγγ(η′) has been determined to be 5.8 ± 1.1 keV (±20% systematic uncertainty). Upper limits on the radiative widths of the f(1270), A2(1310), and f′(1515) mesons have been determined. The two-prong final state events show a signal for the f(1270) decaying into η+π− . The current status of this analysis has been discussed.

Published
2008
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2. 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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3. 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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4. Measurement of High-Energy Direct Photons inψDecays

Author

W. Chinowsky, A. J. Lankford, J. F. Patrick, R. E. Millikan, M. W. Eaton, A. Roussarie, J. M. Weiss, J. Dorenbosch, G. J. Feldman, C. A. Blocker, Mark E. Nelson, H. Taureg, C. Y. Pang, D. L. Scharre, G. H. Trilling, E. Vella, V. Luth, K. G. Hayes, A. D. Johnson, S. Cooper, J. A. Jaros, R. R. Larsen, Martin Breidenbach, M. L. Perl, R. A. Vidal, Walter R. Innes, T. Himel, M. S. Alam, J. Dorfan, D. G. Hitlin, I. Videau, R. F. Schwitters, H. Zaccone, J. L. Siegrist, J. Strait, Rafe Schindler, M. Tonutti, W. E. Dieterle, G. Hanson, J. B. Dillon, Burton Richter, A. M. Boyarski, G. S. Abrams, D. L. Burke, R. J. Hollebeek, M. W. Coles, G. Gidal, M. E. B. Franklin, J. A. Kadhk, P. Jenni, W. C. Carithers, and G. Goldhaber

Subjects
Momentum, Massless particle, Physics, Nuclear physics, Photon, Pion, Meson, Hadron, General Physics and Astronomy, High Energy Physics::Experiment, Elementary particle, Boson
Abstract

The inclusive ..gamma.. and ..pi../sup 0/ momentum distributions at the psi have been measured. Using these data and estimates of eta production, it is found that (4.1 +- 0.8) % of psi decays contain a direct photon with energy greater than 60% of the beam energy. The expected momentum distribution for direct photons calculated to lowest order in quantum chromodynamics is qualitatively different from that observed in the data.

Published
1980
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5. Observation of the radiative transition ψ → γE(1420)

Author

G. H. Trilling, J. A. Kadyk, A. J. Lankford, J. Dorenbosch, G. J. Feldman, M. L. Perl, Walter R. Innes, A. Roussarie, M. S. Alam, H. Taureg, J. L. Siegrist, M. W. Coles, Martin Breidenbach, J. Dorfan, G. Hanson, H. Zaccone, V. Luth, R. A. Vidal, A. M. Boyarski, C. Y. Pang, J. M. Weiss, A. Blondel, J. Strait, W. E. Dieterle, W. C. Carithers, C. A. Blocker, Rafe Schindler, R. R. Larsen, T. Himel, Mark E. Nelson, E. Vella, Roy F Schwitters, M. Tonutti, A. D. Johnson, G. Gidal, S. Cooper, Burton Richter, J. A. Jaros, G. S. Abrams, J. B. Dillon, M. E. B. Franklin, D. L. Scharre, D. G. Hitlin, K. G. Hayes, G. Goldhaber, D. L. Burke, P. Jenni, M. W. Eaton, I. Videau, R. J. Hollebeek, W. Chinowsky, J. F. Patrick, and R. E. Millikan

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Branching fraction, Isospin, Product (mathematics), Electron–positron annihilation, Radiative transition, State (functional analysis), Singlet state, Atomic physics
Abstract

We have observed a radiative transition from the ψ to a state decaying into K S K ± π ∓ , with mass M = 1.44 −0.015 +0.01 GeV/ c 2 and width Γ = 0.05 −0.02 +0.03 GeV/ c 2 . We tentatively identify this state as the E(1420). Assuming that this state is an isospin singlet, we have determined the branching fraction product B(ψ → γ E ) × B( E × K K π) = (3.6 ± 1.4) × 10 −3 .

Published
1980
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6. Observation of the Decayψ→γρ0ρ0

Author

M. E. B. Franklin, P. Jenni, M. S. Alam, J. L. Siegrist, C. Y. Pang, G. Gidal, A. D. Johnson, E. Vella, J. Strait, M. W. Coles, R. J. Hollebeek, S. Cooper, M. W. Eaton, M. Tonutti, C. A. Blocker, D. L. Scharre, M. L. Perl, R. R. Larsen, Mark E. Nelson, Kenneth G. Hayes, A. Roussarie, W. Chinowsky, G. S. Abrams, J. F. Patrick, H. Taureg, R. E. Millikan, Martin Breidenbach, R. A. Vidal, I. Videau, A. J. Lankford, W. C. Carithers, G. Goldhaber, V. Luth, H. Zaccone, T. Himel, C. Zaiser, G. H. Trilling, J. Dorenbosch, D. L. Burke, G. J. Feldman, J. A. Jaros, J. A. Kadyk, R. H. Schindler, D. G. Hitlin, R. F. Schwitters, J. Dorfan, W. E. Dieterle, A. M. Boyarski, J. M. Weiss, Michael Levi, Burton Richter, W. R. Innes, G. Hanson, and J. B. Dillon

Subjects
Massless particle, Nuclear physics, Physics, Pion, Meson, Branching fraction, Hadron, Mass spectrum, General Physics and Astronomy, Elementary particle, Spectral line
Abstract

The prompt photon decay (3095)+-+- has been studied with the Mark II detector at SPEAR. This channel is found to contain a 00 component with 00 masses concentrated between 1.4 and 2.0 GeV/c2. The branching fraction for the 00 decay with masses less than 2.0 GeV/c2 is measured to be (1.25±0.35±0.40)×10-3. © 1982 The American Physical Society.

Published
1982
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7. 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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8. Resonance production by two-photon interactions at SPEAR

Author

D. L. Burke, R. J. Hollebeek, H. Zaccone, C. Y. Pang, A. J. Lankford, Valery I. Telnov, C. A. Blocker, D. L. Scharre, R. R. Larsen, William Carithers, J. M. Weiss, M. E. B. Franklin, W. E. Dieterle, G. H. Trilling, G. S. Abrams, A. M. Boyarski, V. Luth, A. Blondel, J. Dorenbosch, G. J. Feldman, S. Cooper, Martin Breidenbach, T. Himel, R. E. Millikan, W. Chinowsky, Burton Richter, G. Gidal, G. Goldhaber, M. W. Eaton, P. Jenni, R. A. Vidal, I. Videau, J. B. Dillon, E. N. Vella, D. G. Hitlin, J. F. Patrick, M. Tonutti, M. E. Nelson, A. D. Johnson, M. W. Coles, G. Hanson, Michael Levi, J. A. Kadyk, Roy F Schwitters, J. A. Jaros, J. Dorfan, Rafe Schindler, J. Strait, M. S. Alam, J. L. Siegrist, Kenneth G. Hayes, A. Roussarie, H. Taureg, M. L. Perl, and Walter R. Innes

Subjects
Nuclear physics, Physics, Meson, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Radiative transfer, Resonance, High Energy Physics::Experiment, Production (computer science), Elementary particle, Nuclear Experiment, Lambda, Boson
Abstract

Two-photon interactions have been studied with the SLAC-LBL Mark II magnetic detector at SPEAR. The cross section for {eta}' production by the reaction e{sup +}e{sup -} {yields} e{sup +}e{sup -}{eta}' has been measured at beam energies from 2.0 GeV to 3.7 GeV. The radiative width {Lambda}{sub {gamma}{gamma}}({eta}') has been determined to be 5.8 {+-} 1.1 keV ({+-}20% systematic uncertainty). Upper limits on the radiative widths of the f(1270), A{sub 2}(1310) and f'(1515) tensor mesons have been determined. A search has been made for production of the E(1420) by {gamma}{gamma} collisions, but no signal is observed.

Published
1983
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9. 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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10. Observation of Charmed-Baryon Production ine+e−Annihilation

Author

M. E. B. Franklin, I. Videau, A. D. Johnson, D. L. Scharre, G. Goldhaber, V. Luth, J. Strait, S. Cooper, M. Tonutti, A. Roussarie, P. Jenni, C. Y. Pang, H. Zaccone, E. Vella, M. J. Longo, J. B. Dillon, H. Taureg, Rafe Schindler, K. G. Hayes, J. Dorenbosch, G. J. Feldman, J. J. Russell, T. Himel, M. W. Coles, G. Gidal, M. S. Alam, W. Chinowsky, C. A. Blocker, J. L. Siegrist, J. F. Patrick, Mark E. Nelson, R. E. Millikan, W. C. Carithers, Martin Breidenbach, R. R. Larsen, J. Dorfan, J. A. Kadyk, R. A. Vidal, A. M. Boyarski, D. L. Burke, J. M. Weiss, M. L. Perl, G. S. Abrams, Walter R. Innes, J. A. Jaros, G. H. Trilling, Burton Richter, W. E. Dieterle, R. J. Hollebeek, A. J. Lnakford, M. W. Eaton, D. G. Hitlin, R. F. Schwitters, and G. Hanson

Subjects
Baryon, Physics, Nuclear physics, Cross section (physics), Particle physics, Annihilation, Branching fraction, Electron–positron annihilation, General Physics and Astronomy, Spectral line
Abstract

A peak in the pK-+ and p»K+- invariant-mass spectra at 2.2850.006 GeV/c2 is observed, which is associated with the lowest-lying charmed baryon (c). A cross section times branching ratio of 0.0370.012 nb at Ec.m.=5.2 GeV is measured with a substantial fraction of the events produced with an equal recoiling mass. New measurements of inclusive p and cross sections are also presented, allowing an estimate of the branching ratio B(c+pK-+)=0.0220.010. © 1980 The American Physical Society.

Published
1980
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11. 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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12. Measurement ofγγψFinal States inψ′Decay

Author

J. Strait, M. Tonutti, J. Dorenbosch, G. J. Feldman, R. H. Schindler, I. Videau, C. Y. Pang, D. L. Scharre, J. M. Weiss, H. Zaccone, M. L. Perl, W. E. Dieterle, E. Vella, R. R. Larsen, M. S. Alam, J. L. Siegrist, D. G. Hitlin, R. F. Schwitters, M. W. Coles, G. H. Trilling, W. R. Innes, Kenneth G. Hayes, A. Roussarie, G. Hanson, H. Taureg, J. B. Dillon, Martin Breidenbach, J. A. Kadyk, A. J. Lankford, R. A. Vidal, C. A. Blocker, Mark E. Nelson, V. Luth, M. W. Eaton, T. Himel, J. A. Jaros, G. Gidal, M. E. B. Franklin, P. Jenni, G. Goldhaber, W. C. Carithers, R. J. Hollebeek, G. S. Abrams, A. D. Johnson, S. Cooper, W. Chinowsky, J. F. Patrick, R. E. Millikan, D. L. Burke, Burton Richter, M. Levi, J. Dorfan, and A. M. Boyarski

Subjects
Nuclear physics, Physics, Particle decay, Particle physics, Pion, Meson, Branching fraction, Isospin, Hadron, Mass spectrum, General Physics and Astronomy, Decay chain
Abstract

The decay mode ψ′→γγψ has been studied with the Mark-II detector at SPEAR. New measurements of branching ratios for decays of the type ψ′→γχ, χ→γψ involving known χ states are presented. The existence of a χ state of mass near 3455 MeV/c2 produced in this decay chain is not confirmed, and the upper limit (90% confidence level) of the product of branching ratios is measured to be 0.13%. A new decay mode, ψ′→π0ψ, which violates isospin conservation is observed with branching ratio (0.15±0.06)%. © 1980 The American Physical Society.

Published
1980
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13. 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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14. Pion pair production in photon-photon collisions at spear

Author

G. Goldhaber, V. Luth, W. Chinowsky, J. F. Patrick, R. E. Millikan, J. Strait, Michael Levi, T. Himel, M. W. Eaton, C. Y. Pang, Andrew Lankford, R. R. Larsen, I. Videau, J. Dorfan, G. G. Hanson, J. A. Kadyk, A. M. Boyarski, H. Zaccone, M. E. B. Franklin, E. Vella, Martin Breidenbach, M. Tonutti, R. A. Vidal, R. H. Schindler, D. L. Scharre, P. Jenni, M. L. Perl, Burton Richter, A. D. Johnson, G. Gidal, Kenneth G. Hayes, S. Cooper, A. Roussarie, M. W. Coles, W. E. Dieterle, H. Taureg, J. Dorenbosch, D. L. Burke, G. J. Feldman, W. C. Carithers, A. Blondel, G. S. Abrams, J. A. Jaros, W. R. Innes, J. B. Dillon, D. G. Hitlin, R. F. Schwitters, J. M. Weiss, C. A. Blocker, Mark E. Nelson, G. H. Trilling, R. J. Hollebeek, M. S. Alam, and J. L. Siegrist

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Antiparticle, Particle physics, Pair production, Pion, Photon, Meson, Elementary particle, Helicity
Abstract

We report a measurement of the cross section for the process γγ → π + π − at invariant masses 500 MeV/ c 2 m ππ c 2 . A value for the radiative width of the f(1270) tensor meson Γ f→ γγ = 3.6 ± 0.3 ± 0.5 KeV (helicity λ = 2) has been obtained from a fit to the observed ππ mass spectrum.

Published
1981
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15. A search for stable particles heavier than the proton and for quarks produced in e+e− annihilation

Author

C. A. Blocker, J. A. Kadyk, Mark E. Nelson, A. Roussarie, J. A. Jaros, A. D. Johnson, M. W. Coles, H. Taureg, A. M. Boyarski, S. Cooper, R. R. Larsen, A. Blondel, H. Zaccone, W. E. Dieterle, M. E. B. Franklin, G. Goldhaber, M. S. Alam, W. Chinowsky, Burton Richter, J. L. Siegrist, Martin Breidenbach, J. F. Patrick, A. J. Lankford, P. Jenni, R. A. Vidal, R. E. Millikan, J. Dorfan, M. Levi, G. S. Abrams, K. G. Hayes, D. L. Burke, M. W. Eaton, R. J. Hollebeek, G. Gidal, W. C. Carithers, V. Luth, Roy F Schwitters, M. L. Perl, Walter R. Innes, T. Himel, G. Hanson, J. B. Dillon, J. Dorenbosch, G. J. Feldman, I. Videau, Rafe Schindler, D. L. Scharre, J. Strait, M. Tonutti, C. Y. Pang, E. Vella, D. G. Hitlin, G. H. Trilling, and J. M. Weiss

Subjects
Quark, Nuclear physics, Physics, Nuclear and High Energy Physics, Annihilation, Proton, Orders of magnitude (data), Charge (physics)
Abstract

We have searched 1.4 × 10 6 e + e − annihilation events for particles with 1–3 GeV/ c 2 mass and charge Q = − 2 3 from the processes e + e − →q q X and e + e − → q q . Upper limits of RQ ∼ 10 −4 for each process are presented which improve the previous limits on free quark production in electromagnetic interactions by 2 orders of magnitude.

Published
1981
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16. Observation of theηc(2980) Produced in the Radiative Decay of theψ′(3684)

Author

H. Zaccone, W. E. Dieterle, G. Gidal, J. M. Weiss, A. Blondel, M. W. Coles, Martin Breidenbach, Burton Richter, R. A. Vidal, W. R. Innes, J. A. Jaros, V. Luth, D. G. Hitlin, M. Levi, M. S. Alam, D. L. Burke, R. F. Schwitters, J. L. Siegrist, W. C. Carithers, G. Hanson, T. Himel, G. H. Trilling, I. Videau, M. E. B. Franklin, G. Goldhaber, J. Strait, J. B. Dillon, J. Dorfan, A. J. Lankford, A. M. Boyarski, C. Y. Pang, M. Tonutti, P. Jenni, E. Vella, R. R. Larsen, D. L. Scharre, J. Dorenbosch, G. J. Feldman, M. W. Eaton, C. A. Blocker, Mark E. Nelson, J. A. Kadyk, M. L. Perl, Kenneth G. Hayes, A. Roussarie, H. Taureg, G. S. Abrams, A. D. Johnson, S. Cooper, R. J. Hollebeek, W. Chinowsky, J. F. Patrick, R. E. Millikan, and R. H. Schindler

Subjects
Physics, Meson, Branching fraction, Electron–positron annihilation, Hadron, General Physics and Astronomy, Particle identification, Nuclear physics, Particle decay, Mass spectrum, Radiative transfer, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment
Abstract

In a study of {psi}'(3684) radiative decays with the Mark II detector at SPEAR, we observe the decay sequence {psi}' {yields} {gamma}{eta}{sub c}(2980), with the {eta}{sub c}(2980) decaying into several completely reconstructed hadronic modes. We obtain a mass M = 2980 ± 8 MeV / c{sup 2} and a width {Gamma} < 40 MeV / c{sup 2} (90% confidence level), and present estimates of some of the decay branching ratios.

Published
1980
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17. Observation of Semileptonic Decays of Charmed Baryons

Author

J. Strait, A. D. Johnson, S. Cooper, M. W. Eaton, M. Tonutti, G. H. Trilling, R. R. Larsen, V. Luth, Martin Breidenbach, T. Himel, J. Dorfan, R. A. Vidal, D. L. Scharre, W. C. Carithers, M. L. Perl, Walter R. Innes, C. Y. Pang, G. Gidal, Mark E. Nelson, E. Vella, G. Goldhaber, J. Dorenbosch, G. J. Feldman, M. W. Coles, M. E. B. Franklin, H. Zaccone, J. A. Kadyk, J. M. Weiss, Rafe Schindler, C. A. Blocker, A. J. Lankford, J. A. Jaros, I. Videau, A. M. Boyarski, P. Jenni, D. G. Hitlin, W. E. Dieterle, M. S. Alam, Kenneth G. Hayes, A. Roussarie, J. L. Siegrist, H. Taureg, D. L. Burke, G. Hanson, J. B. Dillon, G. S. Abrams, A. Blondel, Burton Richter, R. J. Hollebeek, W. Chinowsky, J. F. Patrick, Roy F Schwitters, and R. E. Millikan

Subjects
Semileptonic decay, Physics, Particle physics, Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear physics, Charmed baryons, Baryon, Particle decay, Pair production, High Energy Physics::Experiment
Abstract

Direct electrons are observed in baryon events produced in e/sup +/e/sup -/ annihilation at center-of-mass energies above the ..lambda../sub c/Lambda-bar/sub c/ threshold. These events are attributed to charmed baryon pair production and subsequent ..lambda../sub c/ semileptonic decay. Various semileptonic branching ratios of the ..lambda../sub c/ are determined, including BR(..lambda../sub c/..-->..e/sup +/X) = (4.5 +- 1.7)%.

Published
1982
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18. Measurement of the Radiative Width of theη′in Two-Photon Interaction at SPEAR

Author

G. Hanson, J. Dorfan, J. A. Kadyk, C. H. Broll, W. Chinowsky, J. F. Patrick, G. S. Abrams, R. E. Millikan, J. J. Russel, H. Zaccone, A. D. Johnson, A. J. Lankford, C. Y. Pang, D. G. Hitlin, R. F. Schwitters, S. Cooper, A. M. Boyarski, M. S. Alam, G. H. Trilling, E. Vella, R. R. Larsen, W. E. Dieterle, V. Luth, J. L. Siegrist, D. L. Burke, M. L. Perl, J. F. Martin, B. Couchman, D. Lüke, Walter R. Innes, T. Himel, K. G. Hayes, M. W. Coles, J. A. Jaros, J. B. Dillon, J. Dorenbosch, G. J. Feldman, J. M. Weiss, Valery I. Telnov, Rafe Schindler, S. R. Shannon, M. W. Eaton, H. G. Fischer, Burton Richter, H. Taureg, G. Gidal, C. A. Blocker, M. E. B. Franklin, G. Goldhaber, Mark E. Nelson, P. Jenni, W. C. Carithers, I. Videau, R. J. Hollebeek, J. Strait, M. Tonutti, D. L. Scharre, Martin Breidenbach, and R. A. Vidal

Subjects
Physics, Meson, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Hadron, General Physics and Astronomy, Elementary particle, Spectral line, Nuclear physics, Particle decay, Radiative transfer, Mass spectrum, High Energy Physics::Experiment, Atomic physics, Boson
Abstract

Events of the type e/sup +/e/sup -/ ..-->.. e/sup +/e/sup -/eta' (958) have been observed with the Mark II detector at SPEAR by detecting the decay mode eta' ..-->.. rho/sup 0/..gamma... From the observed cross section and known branching fractions of the eta' is GAMMA/sub gammagamma/ = 5.9 +- 1.6 +- 1.2 keV and the total width is GAMMA = 300 +- 90 +- 60 keV (statistical and systematic errors).

Published
1979
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19. Measurements of the properties ofD-meson decays

Author

J. Strait, G. H. Trilling, J. A. Kadyk, Martin Breidenbach, G. Hanson, William Carithers, M. E. Nelson, R. R. Larsen, R. A. Vidal, A. M. Boyarski, A. J. Lankford, D. L. Burke, E. N. Vella, M. E. B. Franklin, C. A. Blocker, V. Luth, W. Chinowsky, G. S. Abrams, M. W. Coles, G. Gidal, J. Dorenbosch, G. J. Feldman, Rafe Schindler, P. Jenni, R. E. Millikan, M. S. Alam, J. L. Siegrist, R. J. Hollebeek, Burton Richter, T. Himel, G. Goldhaber, A. Blondel, Roy F Schwitters, J. F. Patrick, W. E. Dieterle, H. Zaccone, I. Videau, D. G. Hitlin, C. Y. Pang, J. M. Weiss, M. Tonutti, M. W. Eaton, D. L. Scharre, S. Cooper, J. A. Jaros, Kenneth G. Hayes, A. Roussarie, H. Taureg, J. Dorfan, J. B. Dillion, M. L. Perl, A. D. Johnson, and Walter R. Innes

Subjects
Semileptonic decay, Physics, Particle decay, education.field_of_study, Particle physics, Pion, Meson, Branching fraction, D meson, Population, Dalitz plot, education
Abstract

We present a study of the decay properties of charmed D mesons produced near the peak of the {psi}" (3770) resonance in e{sup +}e{sup -} annihilation. Branching fractions for nine Cabibbo-favored and three Cabibbo-suppressed decay modes are presented along with upper limits on one additional Cabibbo-favored and four additional Cabibbo-suppressed decay modes. A study of K{pi}{pi} decay mode Dalitz plots reveals a large quasi-two-body pseudoscalar-vector component for the D{sup 0} decays and an apparent nonuniform population an the Dalitz plot for the D{sup +} decay into K{sup -}{pi}{sup +}{pi}{sup +}. Using tagged events, we measure the charged particle multiplicity and strange particle content of D decays. A measurement of the D{sup +} and D{sup 0} semileptonic decay fractions indicates that the D{sup +} has a significantly longer lifetime than the D{sup 0}.

Published
1981
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20. Measurement of the Branching Fraction for the Cabibbo-Suppressed Decayτ−→K−ντ

Author

C. A. Blocker, G. S. Abrams, M. S. Alam, A. Blondel, A. M. Boyarski, M. Breidenbach, D. L. Burke, W. C. Carithers, W. Chinowsky, M. W. Coles, S. Cooper, W. E. Dieterle, J. B. Dillon, J. M. Dorfan, J. Dorenbosch, M. W. Eaton, G. J. Feldman, M. E. B. Franklin, G. Gidal, G. Goldhaber, G. Hanson, K. G. Hayes, T. Himel, D. G. Hitlin, R. J. Hollebeek, W. R. Innes, J. A. Jaros, P. Jenni, A. D. Johnson, J. A. Kadyk, A. J. Lankford, R. R. Larsen, M. Levi, V. Lüth, R. E. Millikan, M. E. Nelson, C. Y. Pang, J. F. Patrick, M. L. Perl, B. Richter, A. Roussarie, D. L. Scharre, R. H. Schindler, R. F. Schwitters, J. L. Siegrist, J. Strait, H. Taureg, M. Tonutti, G. H. Trilling, E. N. Vella, R. A. Vidal, I. Videau, J. M. Weiss, and H. Zaccone

Subjects
General Physics and Astronomy
Published
1982
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21. Measurement of theτLifetime

Author

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

Subjects
Physics, Nuclear physics, Particle decay, Electron–positron annihilation, Detector, Measuring instrument, General Physics and Astronomy, Elementary particle, Particle detector, Linear particle accelerator, Lepton
Abstract

With use of three-prong τ decays observed by the Mark II detector at the Stanford Linear Accelerator Center (PEP), the τ lifetime is measured to be (4.6±1.9)×10-13 sec. © 1982 The American Physical Society.

Published
1982
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22. Variation of the strong coupling constant from a measurement of the jet energy spread in e+e− annihilation

Author

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

Subjects
Quantum chromodynamics, Momentum, Physics, Nuclear and High Energy Physics, Jet (fluid), Range (particle radiation), Annihilation, Quantum electrodynamics, Hadron, Momentum transfer, High Energy Physics::Experiment, Constant (mathematics)
Abstract

A measurement of jet energy spread in the reaction e+e− → hadrons is presented. Using a jet calculus model for the jet development we determine the variation of the strong coupling constant with respect to momentum transfer. The observed variation is consistent with that expected for QCD over a wide range of momentum transfers. This method alone is not sufficient to distinguish QCD from simple limited transverse momentum models.

Published
1983
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23. 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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24. Limits on and ϒ production in e+e− interactions at

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Atomic physics, Bottom quark, Lepton
Abstract

A search has been made for the inclusive production of J ψ (3.1) and Υ{hooked} (9.4) mesons in e+e- interactions at 29 GeV, via their decay into two leptons. No signal is observed in the J ψ region, nor in the Υ{hooked} region. The limits on the cross sections are σ(e+e- → ψX) < 4.4 × 10-36cm2, and σ(e+e- → Υ{hooked}X) < 4.7 × 10-36 cm2. The same data yield limits on the branching ratios for the b quark BR (b → ψX) < 4.9% and BR (b → l+l-X) < 0.8%. © 1983.

Published
1983
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25. A study of the decayτ−→π−μτ

Author

M. S. Alam, J. M. Weiss, J. L. Siegrist, R. R. Larsen, A. D. Johnson, S. Cooper, J. A. Jaros, G. H. Trilling, G. Goldhaber, M. W. Coles, V. Lu¨th, G. S. Abrams, Martin Breidenbach, T. Himel, A. J. Lankford, Roy F Schwitters, C. Y. Pang, R. A. Vidal, J. A. Kadyk, E. Vella, Kenneth G. Hayes, A. Roussarie, R. H. Schindler, H. Taureg, D. G. Hitlin, D. L. Burke, W. E. Dieterle, H. Zaccone, M. L. Perl, M. W. Eaton, D. L. Scharre, Burton Richter, C. A. Blocker, Mark E. Nelson, A. Blondel, M. Levi, J. Dorfan, A. M. Boyarski, I. Videau, R. J. Hollebeek, J. Strait, M. Tonutti, W. Chinowsky, J. F. Patrick, R. E. Millikan, J. Dorenbosch, G. J. Feldman, M. E. B. Franklin, P. Jenni, W. R. Innes, W. C. Carithers, G. Hanson, J. B. Dillon, and G. Gidal

Subjects
Nuclear physics, Hadronic decay, Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Detector, Neutrino, Storage ring, Spin-½
Abstract

We present a high statistics measurement of the branching ratio for the decay τ-→π-μτ using data obtained with the Mark II detector at the SLAC e+e- storage ring SPEAR. We have used events from the center-of-mass energy region 3.52 to 6.7 GeV to determine that B(τ-→π-μτ)=0.117±0.004±0.018. From electron-muon events in the same data sample, we have determined that B(τ-→π-μτ) B(τ-→e--μeμτ)=0.66±0.03±0.11. We present measurements of the mass and spin of the τ and the mass of the τ neutrino based, for the first time, on a hadronic decay mode of the τ. © 1982.

Published
1982
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26. D-meson production ine+e−annihilation atEc.m.between 3.8 and 6.7 GeV

Author

C. Y. Pang, A. D. Johnson, M. S. Alam, J. L. Siegrist, J. B. Dillon, A. Blondel, I. Videau, G. S. Abrams, D. L. Burke, R. R. Larsen, W. E. Dieterle, V. Luth, J. Strait, J. F. Patrick, D. L. Scharre, Martin Breidenbach, M. W. Eaton, R. J. Hollebeek, T. Himel, J. A. Jaros, C. A. Blocker, H. Zaccone, R. A. Vidal, M. E. B. Franklin, E. N. Vella, William Chinowsky, Gerson Goldhaber, George H. Trilling, A. M. Boyarski, George Gidal, J. A. Kadyk, M. Tonutti, A. J. Lankford, Burton Richter, P. Jenni, Mark E. Nelson, A. Roussarie, H. Taureg, M. L. Perl, Walter R. Innes, R. E. Millikan, J. M. Weiss, D. G. Hitlin, R. F. Schwitters, S. Cooper, J. Dorfan, W. C. Carithers, Rafe Schindler, M. W. Coles, K. A. Hayes, G. Hanson, J. Dorenbosch, and G. J. Feldman

Subjects
Physics, Scattering cross-section, Particle physics, Annihilation, Meson, Nuclear Theory, High Energy Physics::Phenomenology, Spectral line, Nuclear physics, Charmed baryons, Recoil, D meson, High Energy Physics::Experiment, Spear, Nuclear Experiment
Abstract

The Mark II detector at SPEAR has been used to study D-meson production in e+e- annihilation at center-of-mass energies between 3.8 and 6.7 GeV. The neutral and charged D mesons are identified from their K and K decay modes. Measurements of RD and of the inclusive differential cross section s ddz are presented. The quasi-two-body cross sections DD, D*D, and D*D* are derived from an overall fit to the D recoil spectra. No evidence was found for the associated production of charmed mesons and charmed baryons. © 1982 The American Physical Society.

Published
1982
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27. Weak Neutral Currents ine+e−Collisions ats=29GeV

Author

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

Subjects
Physics, Nuclear physics, Particle physics, Annihilation, Pair production, Electron–positron annihilation, Electroweak interaction, General Physics and Astronomy, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Universality (dynamical systems), Lepton
Abstract

The differential cross sections for lepton pair production in e+e- annihilation at 29 GeV have been measured and found to be in good agreement with the standard model of the electroweak interaction. With the assumption of e-μ-τ universality, the weak neutral-current couplings are determined to be ga2=0.23±0.05 and gv2=0.03±0.04. © 1983 The American Physical Society.

Published
1983
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28. Decays of theψ(3097)to baryon-antibaryon final states

Author

M. E. Levi, R. R. Larsen, M. E. B. Franklin, A. D. Johnson, Luth, R. J. Hollebeek, J. Dorenbosch, G. J. Feldman, M. Tonutti, M. W. Eaton, P. Jenni, W. Carithers, S. Cooper, R. H. Schindler, J. Strait, T. Himel, D. L. Scharre, C. Y. Pang, Kenneth G. Hayes, A. Roussarie, G. Goldhaber, H. Zaccone, W. E. Dieterle, Alam, G. S. Abrams, H. Taureg, J. L. Siegrist, Martin Breidenbach, C. A. Blocker, Mark E. Nelson, R. A. Vidal, W. R. Innes, J. M. Weiss, J. A. Kadyk, William Chinowsky, J. B. Dillon, J. A. Jaros, A. J. Lankford, E. Vella, G. G. Hanson, George Gidal, M. L. Perl, G. H. Trilling, J. F. Patrick, I. Videau, R. E. Millikan, D. G. Hitlin, R. F. Schwitters, M. W. Coles, Burton Richter, D. L. Burke, J. Dorfan, and A. M. Boyarski

Subjects
Nuclear physics, Baryon, Physics, Particle physics, Antiparticle, Meson, Branching fraction, Antimatter, High Energy Physics::Phenomenology, Hadron, Quark model, High Energy Physics::Experiment, Elementary particle
Abstract

A high-statistics study of psi decays into baryon final states has been done with the Mark II detector at SPEAR. A detailed test of baryon-antibaryon decay modes is presented. Substantial resonance formation is observed in multibody decays of the psi involving baryons. Branching ratios for a large number of decay modes are given, including the radiative decay psi..-->..pp-bar..gamma... The flavor-SU(3)-forbidden decays psi..--> sigma../sup + -/(1385)Sigma-bar /sup - +/+charge conjugate are observed with substantial branching ratios.

Published
1984
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29. Intelligent towers for electromagnetic showers

Author

E. Sadowski, Michael Levi, Roy F Schwitters, C. A. Blocker, T. Edberg, John Oliver, G. W. Brandenburg, N. Patz, T. Schaad, and R. Carey

Subjects
Physics, Resistive touchscreen, Calorimeter (particle physics), Physics::Instrumentation and Detectors, business.industry, Acoustics, General Engineering, Modular design, Anode, Transverse plane, Position (vector), Tube (fluid conveyance), business, Tower
Abstract

A modular gas tube calorimeter for the detection of high energy photons has been constructed and tested. The calorimeter is physically segmented into towers and can be configured to match the geometrical constraints of an experiment. Each tower has the anode signals from the gas tubes combined by a resistive network to give the transverse position and width of an electromagnetic shower in addition to its total energy.

Published
1983
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30. Performance of the Lead/Liquid Argon Shower Counter System of the Mark II Detector at SPEAR

Author

G. S. Abrams, W. E. Dieterle, D. Briggs, C. A. Blocker, V. Luth, Martin Breidenbach, P. Jenni, J. Dorfan, C. Y. Pang, M. W. Eaton, A. J. Lankford, W. C. Carithers, E. Vella, D. G. Hitlin, and G. Hanson

Subjects
Physics, Nuclear and High Energy Physics, Argon, Physics::Instrumentation and Detectors, business.industry, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, chemistry.chemical_element, Particle accelerator, Particle detector, Linear particle accelerator, law.invention, Nuclear physics, Optics, Nuclear Energy and Engineering, chemistry, law, Measuring instrument, Calibration, Electrical and Electronic Engineering, Spear, business
Abstract

The shower counter system of the SLAC-LBL Mark II detector is a large lead/liquid argon system of the type pioneered by Willis and Radekal; however, it differs in most details and is much larger than other such detectors currently in operation, It contains, for example, 8000 liters of liquid argon and 3000 channels of low noise electronics, which is about eight times the size of the system of Willis et al. in the CERN ISR. This paper reports, with little reference to design, on the operation and performance of the Mark II system during approximately a year and a half of operation at the Stanford Linear Accelerator Center's e{sup +}-e{sup -} facility, SPEAR. The design and construction of the system have previously been described and a detailed discussion of all aspects -- design, construction, operation, and performance -- is in preparation.

Published
1980
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31. Emittance Calculations for the Stanford Linear Collider Injector

Author

M. J. Lee, C. A. Blocker, J.C. Sheppard, R. Helm, Roger H. Miller, and J.E. Clendenin

Subjects
Physics, Nuclear and High Energy Physics, business.industry, Particle accelerator, Injector, Linear particle accelerator, law.invention, Optics, Data acquisition, Nuclear Energy and Engineering, law, Data analysis, Physics::Accelerator Physics, Thermal emittance, Electrical and Electronic Engineering, Atomic physics, Beam emittance, business, Diode
Abstract

A computer code has been implemented for on-line acquisition and analysis of data for emittance measurements of the SLC injector beam. The beam emittances have been determined experimentally using this code; measured beam emittance values have been found to be within expectations. When the system operates in the automatic mode, an emittance measurement takes less than two minutes. This emittance measurement method has been thoroughly tested and has been extended to other regions of the SLC system. Resultant beam sigma matrices are used in the lattice design models to calculate the strengths of quadrupoles required for the optical matching of the CID beam into the SLC Linac.

Published
1983
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32. Observation of Cabibbo-Suppressed DecayD0→π−π+andD0→K−K+

Author

J. Strait, M. W. Eaton, M. Tonutti, G. Gidal, H. Zaccone, D. L. Scharre, J. A. Kadyk, R. R. Larsen, M. W. Coles, C. A. Blocker, Mark E. Nelson, I. Videau, R. J. Hollebeek, W. C. Carithers, M. E. B. Franklin, J. A. Jaros, G. Goldhaber, R. H. Schindler, C. H. Broll, V. Luth, C. Y. Pang, D. Lüke, W. E. Dieterle, J. J. Russell, W. R. Innes, P. Jenni, E. Vella, G. S. Abrams, D. G. Hitlin, R. F. Schwitters, W. Chinowsky, J. F. Patrick, T. Himel, G. Hanson, J. B. Dillon, A. D. Johnson, J. Dorenbosch, G. J. Feldman, Martin Breidenbach, S. Cooper, R. E. Millikan, R. A. Vidal, G. H. Trilling, M. L. Perl, Kenneth G. Hayes, H. Taureg, J. M. Weiss, M. S. Alam, J. L. Siegrist, A. J. Lankford, D. L. Burke, Burton Richter, J. Dorfan, and A. M. Boyarski

Subjects
Physics, Particle decay, Meson, Branching fraction, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Hadron, Analytical chemistry, General Physics and Astronomy
Abstract

The D/sup 0/ Cabibbo-suppressed decay modes ..pi../sup -/..pi../sup +/ and K/sup -/K/sup +/ have been observed and the following ratios of D/sup 0/ partial decay widths have been measured: GAMMA (D/sup 0/ ..-->.. ..pi../sup -/..pi../sup +/)/GAMMA (D/sup 0/ ..-->.. K/sup -/..pi../sup +/) = 0.033 +- 0.015 and GAMMA (D/sup 0/ ..-->.. K/sup -/K/sup +/)/GAMMA (D/sup 0/ ..-->.. K/sup -/..pi../sup +/) = 0.113 +- 0.030.

Published
1979
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33. First Results from Mark II at Spear

Author

J. A. Jaros, D. L. Scharre, R. H. Schindler, W. E. Dieterle, D. Lüke, W. R. Innes, E. Vella, A. J. Lankford, M. L. Perl, W. Carithers, J. B. Dillon, J. Dorenbosch, R. F. Schwitters, G. J. Feldman, C. Y. Pang, G. S. Abrams, R. J. Hollebeek, I. Videau, M. S. Alam, J. L. Siegrist, V. Luth, M. W. Eaton, G. G. Hanson, R. R. Larsen, A. D. Johnson, B. Couchman, H. G. Fischer, H. Zaccone, S. Cooper, T. Himel, M. Tonutti, Martin Breidenbach, George Gidal, Kenneth G. Hayes, R. A. Vidal, J. J. Russell, H. Taureg, William Chinowsky, M. J. Longo, C. A. Blocker, D. G. Hitlin, Mark E. Nelson, M. E. B. Franklin, G. Goldhaber, J. M. Weiss, P. Jenni, C. H. Broll, S. R. Shannon, J. F. Patrick, V. I. Telnov, R. E. Millikan, M. W. Coles, J. A. Kadyk, Burton Richter, J. F. Martin, D. L. Burke, James Strait, J. Dorfan, A. M. Boyarski, and G. H. Trilling

Subjects
Physics, Particle physics, Meson, High Energy Physics::Phenomenology, Center (category theory), Particle accelerator, Lambda, Resonance (particle physics), law.invention, Nuclear physics, Baryon, law, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Storage ring
Abstract

In this talk I will report some of the first results from the Mark II experiment at the Stanford Linear Accelerator Center e+e−; storage ring facility SPEAR. The first part will be devoted to a description of the Mark II detector and of its performance. Then I will show preliminary results on a measurement of the inclusive production of baryons \(\left( {p,\,\bar p,\,\Lambda \,and\,\bar \Lambda } \right)\) over the centre-of-mass energy range from 4.5 to 6 GeV in a search for a threshold of charmed baryon production. Data on decays of charmed D mesons have been accumulated at the Ψ ″ (3770) resonance and first results will be given in part three from an analysis of about one-third of the whole data sample. Finally, we have observed, for the first time, evidence for η ′ (958) production in two-photon collisions. We have measured the radiative width of the η ′ through this process as will be discussed in the last part of this talk.

Published
1980
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