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1. Measurement of High-Energy Direct Photons in Decays

Author

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

Abstract

The inclusive and 0 momentum distributions at the have been measured. Using these data and estimates of production, it is found that (4.1 0.8)% of 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. © 1980 The American Physical Society.

Published
1980

2. Observation of Cabibbo-suppressed decay D0-+ and D0K-K+

Author

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

Abstract

The D Cabibbo-suppressed decay modes -+ and K-K+ have been observed and the following ratios of D partial decay widths have been measured: (D-+)(DK-+)=0.0330.015 and (DK-K+)(DK-+)=0.1130.030. © 1979 The American Physical Society.

Published
1979

3. Measurement of γγψ final states in ψ′ decay

Author

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

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

4. Observation of semileptonic decays of charmed baryons

Author

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

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Astrophysics::Cosmology and Extragalactic Astrophysics
Abstract

Direct electrons are observed in baryon events produced in e+e- annihilation at center-of-mass energies above the c»c threshold. These events are attributed to charmed-baryon pair production and subsequent c semileptonic decay. Various semileptonic branching ratios of the c are determined, including B(ce+X)=(4.5 1.7)%. © 1982 The American Physical Society.

Published
1982

5. 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 Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, 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

6. Observation of the radiative transition ψ → γE(1420)

Author

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

Abstract

We have observed a radiative transition from the ψ to a state decaying into KSK±π∓, with mass M = 1.44-0.015+0.01 GeV/c2 and width Γ = 0.05-0.02+0.03 GeV/c2. 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 → γE) × B(E × KKπ) = (3.6 ± 1.4) × 10-3. © 1980.

Published
1980

7. Measurement of the τ lifetime

Author

Feldman, GJ, Trilling, GH, Abrams, GS, Amidei, D, Bäcker, A, Blocker, CA, Blondel, A, Boyarski, AM, Breidenbach, M, Burke, DL, Chinowsky, W, Coles, MW, Dardel, GV, Dieterle, WE, Dillon, JB, Dorenbosch, J, Dorfan, JM, Eaton, MW, Franklin, MEB, Gidal, G, Gladney, L, Goldhaber, G, Golding, LJ, Hanson, G, Hollebeek, RJ, Innes, WR, Jaros, JA, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, and LeClaire, B

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

8. A measurement of the cross section for four-pion production in λλ collisions at spear

Author

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

Abstract

We present a measurement of the cross section for the reaction e+e-→ e+e-π+π-π+π-at SPEAR. This channel is found to be large and dominated by the process γγ → ρ{variant}0ρ{variant}0→ π+π-π+π-. The cross section, which is small just above the four-pion threshold, exhibits a large enhancement near the ρ{variant}0ρ{variant}0threshold. © 1981.

Published
1981

9. 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
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics
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

10. Pion pair production in photon-photon collisions at spear

Author

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

Abstract

We report a measurement of the cross section for the process γγ→π+π-at invariant masses 500 MeV/c2< mππ

Published
1981

11. Measurement of the branching fraction for the cabibbo-suppressed decay K*-(892)

Author

Dorfan, JM, Blocker, CA, Abrams, GS, Alam, MS, Boyarski, AM, Breidenbach, M, Burke, DL, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Dorenbosch, J, Eaton, MW, Feldman, GJ, Franklin, MEB, Gidal, G, Goldhaber, G, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, and L̈th, V

Abstract

This Letter presents a measurement of the branching fraction for the Cabibbo-suppressed decay -K*-(892) with use of data obtained with the Mark-II detector at SPEAR. Eleven events containing a K*(892) in coincidence with a muon or an electron of opposite charge were found in data which span the center-of-mass energy region 4.2

Published
1981

12. Measurement of the Branching Fraction for the Cabibbo-Suppressed Decay τ-→K-ντ

Author

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

Abstract

The branching fraction for the Cabibbo-suppressed decay τ-→K-ντ is measured from data obtained with the Mark II detector at SPEAR. Fifteen events containing a K± in coincidence with a muon or electron of opposite charge are observed. It is determined that B(τ-→K-ντ)=(1.3±0.5)%. © 1982 The American Physical Society.

Published
1982

13. A study of the decay τ-→π-μτ

Author

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

Abstract

We present a high statistics measurement of the branching ratio for the decay τ-→π-μτusing 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

14. Observation of charmed-baryon production in e+e- annihilation

Author

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

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

15. Observation of scale breaking in inclusive hadron production by e+e- annihilation

Author

Patrick, JF, Lüth, V, Siegrist, JL, Abrams, GS, Alam, MS, Amidei, D, Bäcker, A, Blocker, CA, Blondel, A, Boyarski, AM, Breidenbach, M, Burke, DL, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Dorenbosch, J, Dorfan, JM, Eaton, MW, Feldman, GJ, Franklin, MEB, Gidal, G, Gladney, L, Goldhaber, G, Golding, LJ, Hanson, G, Hayes, KG, Himel, T, and Hitlin, DG

Abstract

Measurements are presented of the inclusive charged-particle cross sections s dσdx for e+e- annihilation at center-of-mass energies of 5.2, 6.5, and 29.0 GeV. Significant scale breaking is observed in these cross sections. © 1982 The American Physical Society.

Published
1982

16. Observations of S*→ π+π-in ψ decay

Author

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

Abstract

Copious production of S*decaying into π+π-is observed in ψ decay. (974 ± 4 -i14 ± 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)%. © 1981.

Published
1981

17. Measurement of the branching fraction for τ→ρν

Author

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

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

18. 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 Experiment
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

19. 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
High Energy Physics::Experiment
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

20. Measurement of ψ(3097) and ψ′(3686) decays into selected hadronic modes

Author

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

Subjects
High Energy Physics::Experiment
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

21. 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

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

22. Measurement of energy correlations in e+e-→hadrons

Author

Schlatter, D, Abrams, GS, Amidei, D, Bäcker, A, Blocker, CA, Blondel, A, Boyarski, AM, Breidenbach, M, Burke, DL, Chinowsky, W, Coles, MW, Von Dardel, G, Dieterle, WE, Dillon, JB, Dorenbosch, J, Dorfan, JM, Eaton, MW, Feldman, GJ, Franklin, MEB, Gidal, G, Gladney, L, Goldhaber, G, Golding, LJ, Hanson, G, Hollebeek, RJ, Innes, WR, Jaros, JA, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, and LeClaire, B

Subjects
Physics::Accelerator Physics, High Energy Physics::Experiment
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

23. Observation of the c (2980) Produced in the Radiative Decay of the (3684)

Author

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

Subjects
Physics::Accelerator Physics, High Energy Physics::Experiment
Abstract

In a study of (3684) radiative decays with the Mark II detector at SPEAR, the decay sequence c (2980) is observed, with the c (2980) decaying into several completely reconstructed hadronic modes. A mass M=29808 MeV/c2 and a width

Published
1980

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