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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

2. Starting from the bottom up

Author

J B, Dillon

Subjects
Cost Control, Education, Medical, Humans, Health Care Costs, Physician's Role, Delivery of Health Care, United States
Published
1992

3. Experimental upper limits on branching fractions for unexpected decay modes of theτlepton

Author

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

Subjects
Physics, Particle physics, Annihilation, Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Lepton number, Nuclear physics, Particle decay, Pair production, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Lepton
Abstract

Searches for 12 neutrinoless decay modes of the which violate lepton-number conservation have been made using the reaction e+e-+-. No evidence for lepton-number violation is observed, and we have set upper limits (90% C.L.) on the branching ratio for each decay mode. The branching-ratio limits on the radiative decays and e are 0.055 and 0.064%, respectively. For the charged lepton decays ee, eee, and, the branching ratio limits are 0.040, 0.033, 0.044, and 0.049%, respectively. Upper limits on the branching ratios for the following charged lepton + neutral hadron decays are 0 (0.037%), 0 (0.044%), eK0 (0.13%), K0 (0.10%), 0 (0.21%), and 0 (0.082%). We also use these data to search for the pair production in e+e- annihilation of some unconventional particles with masses less than about 3 GeV/c2. © 1982 The American Physical Society.

Published
1982

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. Direct photon production at theψ

Author

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

Subjects
Massless particle, Nuclear physics, Physics, Particle physics, Particle decay, Photon, Annihilation, Meson, Quark model, Elementary particle, Invariant mass
Abstract

We present results of a detailed analysis of inclusive direct photon production at the (3095). The direct-photon momentum distribution for x>0.4 is presented and compared with the leading-order quantum-chromodynamic prediction. The total production rate is found to be consistent with theoretical expectations, but the observed momentum distribution is considerably softer. Results of an analysis of some inclusive properties of the hadronic system recoiling against the direct photon are presented. The mean charged-particle and Ks multiplicities are presented as functions of the invariant mass of the hadronic system. These data agree well with the corresponding mean multiplicities measured in e+e- annihilations at center-of-mass energies comparable to the invariant mass of the hadronic system. © 1981 The American Physical Society.

Published
1981

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

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

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

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

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

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

25. Measurement of the Branching Fraction forτ→ρν

Author

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

Subjects
Semileptonic decay, Physics, Nuclear physics, Particle decay, Muon, Meson, Branching fraction, Hadron, General Physics and Astronomy, Electron, Atomic physics, Lepton
Abstract

This Letter presents a measurement of the decay τ-→ρ-ντ using data obtained with the Mark II detector at SPEAR. In the center-of-mass energy region 4.5

Published
1979

26. 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

27. Measurement ofψ(3097)andψ′(3686)Decays into Selected Hadronic Modes

Author

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

Subjects
Physics, Nuclear physics, Particle decay, Particle physics, Pion, Pair production, Meson, Branching fraction, Electron–positron annihilation, General Physics and Astronomy, High Energy Physics::Experiment, Elementary particle, Lepton
Abstract

Measurements of ψ(3097) and ψ′(3686) branching fractions for selected hadronic decays are presented. The ratio of ψ′ to ψ branching fractions for these decays is consistent with the ratio of branching fractions to lepton pairs, with the exception of the decays to pπ and K*K for which this ratio is substantially smaller. © 1983 The American Physical Society.

Published
1983

28. Observations of

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Branching fraction, Atomic physics
Abstract

Copious production of S ∗ decaying into π + π − is observed in ψ decay. (974 ± 4 - i 14 ± 5) MeV, consistent with the parameters extracted from couplede channel; fits to pheripheral π + π − and K + K − production experiments. The inclusive branching ratio for ψ → S ∗ + X is found to be (0.42 ± 0.08)%.

Published
1981

29. 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

30. 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

31. 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

32. Measurement of the parameters of theψ(3770)resonance

Author

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

Subjects
Nuclear physics, Physics, Elastic scattering, Electron pair, Annihilation, Meson, Scattering, Electron–positron annihilation, Hadron, Atomic physics, Nuclear Experiment, Bhabha scattering
Abstract

We present a measurement of the cross section for hadron production by e+e- annihilation in the vicinity of the previously observed resonance near 3.77 GeV. The data are used to determine the parameters of the (3770) resonance. The values found are: mass, 3764±5 MeV/c2, total width, 23.5±5 MeV, and partial width to electron pairs, 276±50 eV. © 1980 The American Physical Society.

Published
1980

33. 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

34. Physiological Effects of Some Thio-Esters of Choline

Author

J. B. Dillon, C. N. Jordan, and W. F. Alexander

Subjects
Bradycardia, medicine.medical_specialty, CATS, Chloralose, Chloride, General Biochemistry, Genetics and Molecular Biology, chemistry.chemical_compound, Endocrinology, Blood pressure, chemistry, Internal medicine, Anesthesia, Respiration, medicine, Choline, medicine.symptom, medicine.drug, Choline chloride
Abstract

The effects on blood pressure and respiration produced in cats and dogs under morphine-urethane, nembutal and chloralose anesthesias, by intravenous injections of thio-acetyl choline chloride, thio-acetyl-gamma-homo-choline chloride and thio-acetyl-beta-methyl choline chloride have been observed and recorded.∗ Eighteen animals (10 cats and 8 dogs) have been used in these experiments. Records were taken of the results of over 200 injections, of which approximately one-third was of each of the 3 compounds. The results of the administration of each compound were constant.Thio-acetyl-choline chloride and thio-acetyl-gamma-homo choline chloride are almost identical in their effects. Immediately following injection the blood pressure falls slightly, then rises rapidly to 60 to 90 mm Hg above the normal level. During this rapid rise the heart rate increases but upon reaching the peak pressure the rate slows and large vagal beats appear. The duration of this bradycardia varies from one to 5 minutes depending upon...

Published
1938

35. 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

38. A further evaluation of thymectomy for myasthenia gravis

Author

G D, Buckberg, C, Herrmann, J B, Dillon, and D G, Mulder

Subjects
Adult, Male, Aging, Postoperative Complications, Myasthenia Gravis, Humans, Female, Sex, Thymus Neoplasms, Middle Aged, Thymectomy, Aged
Published
1967

42. Rational use of ketamine as an anaesthetic

Author

J B, Dillon

Subjects
Adult, Adolescent, Vomiting, Respiration, Blood Pressure, Nausea, Neuromuscular Diseases, Middle Aged, Dreams, Cyclohexanes, Erythema, Heart Rate, Hallucinogens, Humans, Ketamine, Child, Salivation, Intraocular Pressure, Aged, Anesthetics, Cerebrospinal Fluid, Research Article
Published
1971

43. Nitrous oxide inhalation as a fad. Dangers in uncontrolled sniffing for psychedelic effect

Author

J B, Dillon

Subjects
Adult, Heroin, Adolescent, Substance-Related Disorders, Hallucinogens, Nitrous Oxide, Humans, Articles, California
Abstract

"LAUGHING GAS is the newest thing for kids seeking kicks," the Stanford Daily reports. "They sniff it."So begins a news story in the Los Angeles Times of 26 January 1967. The story continues:"It's the latest way to travel, or so say a growing group of devotees on the campus," the university student paper said. "It can produce much the same effects as psychedelic drugs, they claim, and it's cheaper to obtain.""One student said he buys the gas, nitrous oxide, from a medical supply house. ;They think I am anesthetizing rats,' he explained."Campus medical authorities said the gas, sniffed ;in sufficient amounts... could produce all the states of anesthesia, including the final stage-death.'"

Published
1967

44. Clinical investigation of compound 347 (Ethrane)

Author

M H, Lebowitz, C D, Blitt, and J B, Dillon

Subjects
Adult, Central Nervous System, Adolescent, Chemical Phenomena, Chemistry, Physical, Muscles, Respiration, Electroencephalography, Middle Aged, Cardiovascular System, Methoxyflurane, Child, Preschool, Humans, Anesthesia, Inhalation, Child, Halothane, Preanesthetic Medication, Aged, Ethers
Published
1970

45. Oxygen therapy

Author

J B, DILLON

Subjects
Oxygen, Acute Disease, Oxygen Inhalation Therapy, Humans, Shock, Articles
Abstract

Oxygen, properly administered, often is a valuable therapeutic agent in many conditions such as hemorrhage, heart disease, respiratory diseases, anemia, shock, infection with fever and others in which there is direct or indirect interference with normal oxygenation of tissues. In severe heart disease or acute respiratory conditions, administration of oxygen under pressure may be necessary in order to deliver the required amount to the tissues in want. For conditions in which oxygen want is less critical, 50 per cent concentration of the gas in the inspired atmosphere is effective and more easily carried out. Patients with chronic heart disease may be greatly helped by taking oxygen at home under the direction of a physician.

Published
1952

50. PROBLEMS IN THE ADMINISTRATION OF MULTIPLE BLOOD TRANSFUSIONS

Author

J B, DILLON

Subjects
Hepatitis B virus, Sodium, Infant, Newborn, Infant, Hypothermia, Hepatitis A, Toxicology, Gluconates, Antibodies, Bicarbonates, Blood Group Incompatibility, Humans, Blood Transfusion, Calcium, Citrates, Child
Published
1964

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