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13 results on '"Dillon, JB"'

1. Decays of the ψ(3097) to baryon-antibaryon final states

Author

Eaton, MW, Goldhaber, G, Abrams, GS, Blocker, CA, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Gidal, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Levi, M, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, E, Videau, I, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Larsen, RR, Lüth, V, Perl, ML, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, and Zaccone, H

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

A high-statistics study of 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 involving baryons. Branching ratios for a large number of decay modes are given, including the radiative decay pp. The flavor-SU(3)-forbidden decays (1385)+charge conjugate are observed with substantial branching ratios. © 1984 The American Physical Society.

Published
1984

2. Direct photon production at the ψ

Author

Scharre, DL, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Lüth, V, Perl, ML, Richter, B, Roussarie, A, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, Zaccone, H, Abrams, GS, Blocker, CA, Carithers, WC, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, and Videau, I

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
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

3. Measurement of the parameters of the ψ(3770) resonance

Author

Schindler, RH, Siegrist, JL, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Larsen, RR, Lüth, V, Perl, ML, Richter, B, Scharre, DL, Schwitters, RF, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, Zaccone, H, Abrams, GS, Blocker, CA, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, and Videau, I

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
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

4. D-meson production in e+e- annihilation at Ec.m. between 3.8 and 6.7 GeV

Author

Coles, MW, Abrams, GS, Blocker, CA, Blondel, A, Carithers, WC, Chinowsky, W, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, Videau, I, Alam, MS, Boyarski, A, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KA, Himel, T, Hitlin, DG, Hollebeek, R, Innes, W, Jaros, J, Jenni, P, Larsen, RR, Luth, V, Perl, ML, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, and Zaccone, H

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
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

5. Pion pair production from γγ collisions at the SLAC e+e- storage ring PEP

Author

Smith, JR, Burke, DL, Boyarski, AM, Breidenbach, M, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hollebeek, RJ, Innes, WR, Jaros, JA, Lankford, AJ, Larsen, RR, LeClaire, B, Lockyer, N, Lüth, V, Matteuzzi, C, Perl, ML, Richter, B, Schlatter, D, Weiss, J, Yelton, JM, Zaiser, C, Abrams, GS, Amidei, D, Chinowsky, W, Dieterle, WE, Dillon, JB, Eaton, MW, Franklin, MEB, Gidal, G, Gold, MS, Goldhaber, G, Golding, LJ, Johnson, AD, Kadyk, JA, Nelson, ME, Patrick, JF, Rowson, PC, Schellman, HM, Sheldon, PD, Strait, J, de la Vaissière, C, Blocker, CA, Levi, M, Schaad, T, and Schwitters, RF

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We have studied several features of the production of charged-hardon pairs by γγ collisions. We have measured the f0 partial width Γf0→γγ(Q2) for Q2 in the range 0

Published
1984

6. Experimental upper limits on branching fractions for unexpected decay modes of the τ lepton

Author

Hayes, KG, Perl, ML, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Larsen, RR, Lüth, V, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, Zaccone, H, Abrams, GS, Blocker, CA, Blondel, A, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Levi, M, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, and Videau, I

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
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

7. Measurement of K* and K0 inclusive rates in e+e- annihilation at 29 GeV

Author

Schellman, H, Trilling, GH, Abrams, GS, Amidei, D, Baden, AR, Boyer, J, Butler, F, Dillon, JB, Gidal, G, Gold, MS, Goldhaber, G, Golding, LJ, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schmidke, WB, Sheldon, PD, de la Vaissiere, C, Wood, DR, Barklow, T, Boyarski, AM, Breidenbach, M, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Himel, T, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Matteuzzi, C, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Schlatter, D, Yelton, JM, Zaiser, C, Levi, ME, and Schaad, T

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We have measured the K0+K0 inclusive cross section in e+e- annihilation at 29 GeV with the Mark II detector SLAC PEP. We find 1.270.030.15 K0+K0 per hadronic event. We have also used time-of-flight particle identification to measure the K rate over the momentum range 300900 MeV/c. © 1985 The American Physical Society.

Published
1985

8. Decays of the (3097) to baryon-antibaryon final states

Author

Eaton, MW, Goldhaber, G, Abrams, GS, Blocker, CA, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Gidal, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Levi, M, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, E, Videau, I, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Larsen, RR, Lüth, V, Perl, ML, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, and Zaccone, H

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

A high-statistics study of 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 involving baryons. Branching ratios for a large number of decay modes are given, including the radiative decay pp. The flavor-SU(3)-forbidden decays (1385)+charge conjugate are observed with substantial branching ratios. © 1984 The American Physical Society.

Published
1984

9. Direct photon production at the

Author

Scharre, DL, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Lath, V, Perl, ML, Richter, B, Roussarie, A, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, Zaccone, H, Abrams, GS, Blocker, CA, Carithers, WC, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, and Videau, I

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
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

10. Measurement of the parameters of the (3770) resonance

Author

Schindler, RH, Siegrist, JL, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Larsen, RR, L̈th, V, Perl, ML, Richter, B, Scharre, DL, Schwitters, RF, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, Zaccone, H, Abrams, GS, Blocker, CA, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, and Videau, I

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
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

11. Experimental upper limits on branching fractions for unexpected decay modes of the lepton

Author

Hayes, KG, Perl, ML, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Larsen, RR, L̈th, V, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, Zaccone, H, Abrams, GS, Blocker, CA, Blondel, A, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Levi, M, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, and Videau, I

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
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

12. D-meson production in e+e- annihilation at Ec.m. between 3.8 and 6.7 GeV

Author

Coles, MW, Abrams, GS, Blocker, CA, Blondel, A, Carithers, WC, Chinowsky, W, Cooper, S, Dieterle, WE, Dillon, JB, Eaton, MW, Gidal, G, Goldhaber, G, Johnson, AD, Kadyk, JA, Lankford, AJ, Millikan, RE, Nelson, ME, Pang, CY, Patrick, JF, Strait, J, Trilling, GH, Vella, EN, Videau, I, Alam, MS, Boyarski, A, Breidenbach, M, Burke, DL, Dorenbosch, J, Dorfan, JM, Feldman, GJ, Franklin, MEB, Hanson, G, Hayes, KA, Himel, T, Hitlin, DG, Hollebeek, R, Innes, W, Jaros, J, Jenni, P, Larsen, RR, Luth, V, Perl, ML, Richter, B, Roussarie, A, Scharre, DL, Schindler, RH, Schwitters, RF, Siegrist, JL, Taureg, H, Tonutti, M, Vidal, RA, Weiss, JM, and Zaccone, H

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
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

13. Pion pair production from γγ collisions at the SLAC e+e- storage ring PEP

Author

Smith, JR, Burke, DL, Boyarski, AM, Breidenbach, M, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hollebeek, RJ, Innes, WR, Jaros, JA, Lankford, AJ, Larsen, RR, LeClaire, B, Lockyer, N, Lüth, V, Matteuzzi, C, Perl, ML, Richter, B, Schlatter, D, Weiss, J, Yelton, JM, Zaiser, C, Abrams, GS, Amidei, D, Chinowsky, W, Dieterle, WE, Dillon, JB, Eaton, MW, Franklin, MEB, Gidal, G, Gold, MS, Goldhaber, G, Golding, LJ, Johnson, AD, Kadyk, JA, Nelson, ME, Patrick, JF, Rowson, PC, Schellman, HM, Sheldon, PD, Strait, J, De La Vaissière, C, Blocker, CA, Levi, M, Schaad, T, and Schwitters, RF

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We have studied several features of the production of charged-hardon pairs by γγ collisions. We have measured the f0 partial width Γf0→γγ(Q2) for Q2 in the range 0

Published
1984

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