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18 results on '"Ong RA"'

1. Test of QED to fourth order by study of four-lepton final states in e+e- interactions at 29 GeV with the Mark II detector.

Author

Petradza, M, Thun, R, Abrams, G, Amidei, D, Baden, AR, Barklow, T, Boyarski, A, Boyer, J, Burchat, PR, Burke, DL, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Haggerty, J, Jaros, JA, Kadyk, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Lockyer, NS, Lüth, V, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, and Yelton, JM

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

We have tested QED to fourth order in the coupling constant in the large-Q2 region by studying four-lepton final states in e+e- interactions with the Mark II detector at the SLAC storage ring PEP (s=29 GeV). All four final-state particles were detected at large angles with respect to the beam axis. For an integrated luminosity of 205 pb-1, we observed ten e+e-e+e-, ten e+e-+-, and one events with opposite-charge pair masses greater than 1 GeV/c2. These events show good agreement with the complete 4 QED calculation. © 1990 The American Physical Society.

Published
1990

2. Two-photon production of pion pairs.

Author

Boyer, J, Butler, F, Gidal, G, Abrams, G, Amidei, D, Baden, AR, Gold, MS, Golding, L, Goldhaber, G, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, Barklow, T, Boyarski, A, Burchat, P, Burke, DL, Cords, D, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Perl, ML, Richter, B, Riles, K, Yelton, JM, and Schaad, T

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

We present a new high-statistics measurement of the cross section for the process e+e-e+e-+- at a center-of-mass energy of 29 GeV for invariant pion-pair masses M(+-) between 350 MeV/c2 and 1.6 GeV/c2. We observe the f2(1270) and measure its radiative width to be 3.15±0.04±0.39 keV. We also observe an enhancement in the +- spectrum near 1 GeV. General agreement is found with unitarized models of the +- reaction that include final-state interactions. © 1990 The American Physical Society.

Published
1990

3. Measurement of the two-photon width of the eta '(958).

Author

Butler, F, Boyer, J, Gidal, G, Abrams, G, Amidei, D, Baden, AR, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, Riles, K, Perl, ML, Barklow, T, Boyarski, A, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Richter, B, Yelton, JM, and Schaad, T

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

Using 203 pb-1 of data collected by the Mark II detector at the SLAC storage ring PEP, we have measured the radiative width of the for quasireal photons. The width is separately measured in the three reactions e+e-e+e-0+-,0; e+e-e+e-0+-; 0+-(0,), and e+e-e+e-0, giving a statistically weighted average two-photon width of=4.57±0.25±0.44 keV. As a byproduct of the study of the decay mode, we also measured the two-photon decay width of the a2(1320) as a2(1320)=1.03±0.13±0.21 keV. © 1990 The American Physical Society.

Published
1990

4. Search for a nearly degenerate lepton doublet (L-,L0).

Author

Riles, K, Perl, ML, Barklow, T, Boyarski, A, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Richter, B, Yelton, JM, Abrams, G, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, and Schaad, T

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

We have searched for a heavy charged lepton with an associated neutrino of nearly the same mass in e+e- annihilation data taken with the Mark II detector at a center-of-mass energy of 29 GeV. In order to suppress contamination from conventional two-photon reactions, this analysis uses a novel, radiative-tagging technique. Requiring the presence of an isolated, energetic photon allows a search for lepton doublets with mass splittings smaller than that previously accessible to experiment. No evidence for such a new lepton doublet has been found, enabling limits to be placed on allowed mass combinations. Mass splittings as low as 250-400 MeV/c2 are excluded for charged-lepton masses between 500 MeV/c2 and 10 GeV/c2. © 1990 The American Physical Society.

Published
1990

5. Radiative tau production and decay.

Author

Wu, DY, Hayes, K, Perl, ML, Barklow, T, Boyarski, A, Burchat, PR, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Richter, B, Riles, K, Yelton, JM, Abrams, G, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, and Schaad, T

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

We have studied the muon decay channel of the lepton with the presence of a photon in e+e- annihilation data at Ec.m.=29 GeV from the Mark II detector. Included in this study is the first direct measurement of radiative decay. We find the ratio of the measured branching fraction to the expected value from QED to be 1.03±0.42. © 1990 The American Physical Society.

Published
1990

7. Measurement of the D0 and D+ lifetimes.

Author

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

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

Published
1986

8. Bose-Einstein correlations in e+e- collisions.

Author

Juricic, I, Goldhaber, G, Gidal, G, Abrams, G, Amidei, D, Baden, AR, Boyer, J, Butler, F, Carithers, WC, Gold, MS, Golding, L, Haggerty, J, Herrup, D, Kadyk, JA, Levi, ME, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, Barklow, T, Boyarski, A, Breidenbach, M, Burchat, P, Burke, DL, Cords, D, Dorfan, JM, Feldman, GJ, Gladney, L, Hanson, G, Hayes, K, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Karlen, D, Klein, SR, Lankford, AJ, Larsen, RR, LeClaire, BW, Lockyer, NS, Lüth, V, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Schindler, RH, Yelton, JM, 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

Four data sets collected with the Mark II detector during its operation at the SPEAR and PEP e+e- storage rings at SLAC are used to study the Bose-Einstein correlation between pairs and triplets of like-sign charged pions. The data sets represent four different regions of energy available for hadron production: the J at s =3.095 GeV, typical hadronic energy of 5 GeV in two-photon events, and annihilation in the energy regions s =47 GeV above the J, and s =29 GeV. The Bose-Einstein correlation is studied as a function of Q2, the four-momentum difference squared of the pair, and of Q32, an analogous quantity defined for triplets. After corrections for Coulomb effects and pion misidentification, pair analyses indicate a nearly full Bose-Einstein enhancement (1) in the J and the two-photon data, and about half the maximum value in the two higher-energy data sets. The pair analysis parameter r lies within a band of ±0.1 fm around 0.7 fm and is essentially the same for all four data sets. Pion triplet analyses give consistent results for the triplet parameters 3 and r3. In an attempt to investigate the shape of the pion source, we also study the Bose-Einstein correlation in pion pairs using two-dimensional distributions in components of Q2. © 1989 The American Physical Society.

Published
1989

9. Improved upper limit on nu tau mass.

Author

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

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 update our previous analysis of the 3±01/2 decay mode by the addition of new data to obtain an improved upper limit on the 1/2 mass of 143 MeV/c2 at the 95% confidence level. © 1985 The American Physical Society.

Published
1985

10. Measurement of the tau lifetime.

Author

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

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 used a high-resolution drift chamber in the Mark II detector at the SLAC storage ring PEP to measure the lifetime of leptons produced in e+e- annihilations at 29 GeV. Based on the flight-path distribution of 807 three-prong decays, the lifetime is found to be (2.880.16 0.17)×10-13 sec, in agreement with expectations for e - universality. © 1988 The American Physical Society.

Published
1988

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

Author

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

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

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

Published
1985

12. Measurement of the branching fractions of the tau lepton using a tagged sample of tau decays.

Author

Burchat, PR, Feldman, GJ, Barklow, T, Boyarski, AM, Burke, DL, Dorfan, JM, Gladney, L, Hanson, G, Hayes, K, 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, Yelton, JM, Zaiser, C, Abrams, GS, Amidei, D, Baden, AR, Boyer, J, Butler, F, Gidal, G, Gold, MS, Goldhaber, G, Golding, L, Haggerty, J, Herrup, D, Juricic, I, Kadyk, JA, Nelson, ME, Rowson, PC, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, de la Vaissiere C, Wood, DR, Levi, ME, and Schaad, T

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 branching fractions for the major decay modes of the lepton are measured from a sample of tagged decays selected from +- pairs produced in e+e- annihilation. The decay products of one member of the +- pair are used to identify the event. The opposite member of the pair is then included in the sample if it satisfies an invariant-mass cut and a charged-multiplicity cut. In this way, we attempt to select an unbiased sample of decays. The sample is divided into categories based on charged- and neutral-particle multiplicities, and charged-particle identification. The branching fractions are measured simultaneously, with an unfold technique and a maximum-likelihood fit, with the sum of the branching fractions constrained to be unity. The branching fractions for the decay modes - K- and - K*- are fixed at the world averages in the fit. The following branching fractions are measured: B(-e) =(19.10.81.1)%, B(-' - )=(18.30.90.8)%, B(-) =(10.01.1 *1,4)%, B(-0) =(25.81.72.5)%, B(-(n0, n>1))=(12.01.42.5)%, B(-+-) =(6.7 0.80.9)%, and B(-+- (n0,n>0)) =(6.10.80.9)%. The total branching fraction to one charged pion plus at least one neutral hadron is measured to be (37.81.21.0)%. Limits on allowed decay modes involving the meson are discussed. © 1987 The American Physical Society.

Published
1987

13. 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
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 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

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

Author

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

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

This paper presents a study of events produced in 29-GeV electron-positron annihilation in which there are just two noncollinear charged particles, no detected photons, and two or more undetected particles. These events can be explained by attributing them primarily to the reactions e+e-'e+e-e+e- and e+e-'e+e-+- where just two particles appear in the Mark II detector. There is no evidence for unconventional sources for such events. © 1986 The American Physical Society.

Published
1986

15. Limit on the decay D0-->e micro+/-

Author

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

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Published
1987

16. Measurement of single and double radiative low-Q2 Bhabha scattering at Ec.m.

Author

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

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

The process e+e-e+e-(), where one electron scatters at a small angle, is studied with data from the Mark II detector at the SLAC storage ring PEP. The data are in excellent agreement with a Monte Carlo calculation and include a large contribution from order 4. The ratio of measured to calculated cross sections is R=0.9930.0170.015, where the first error is statistical and the second systematic. This is a sensitive test of the calculation of the dominant background for neutrino-counting experiments. © 1989 The American Physical Society.

Published
1989

17. Limits on new-lepton pairs (L-,L0) with arbitrary neutrino mass.

Author

Stoker, DP, Perl, ML, Abrams, G, Baden, AR, Barklow, T, Barnett, BA, Boyarski, AM, Boyer, J, Burchat, PR, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Hanson, G, Harral, BD, Hayes, K, Herrup, D, Hylen, JE, Innes, WR, Jaros, JA, Kadyk, JA, Karlen, D, Klein, SR, Lankford, AJ, LeClaire, BW, Levi, M, Lüth, V, Matthews, JA, Ong, RA, Riles, K, Rowson, PC, and Wood, DR

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

We have searched 205 pb-1 of s =29 GeV data from the Mark II detector at the SLAC e+e- storage ring PEP for events which may signify the existence of a new lepton pair (L-,L0) where the L0 may be massive, but does not exceed the L- mass. Three event signatures for L+L- decay are examined: (i) e, (ii) (e or)(+4), and (iii) (e or )(3+0). The numbers of signature events are found to be in good agreement with Monte Carlo simulations of known background sources. The ranges of L- and L0 masses for which new lepton pairs are excluded are obtained using a likelihood-ratio method to compare the number of observed signature events to the expected background, and to the expected background plus Monte Carlo predictions of (L-,L0) signals. © 1989 The American Physical Society.

Published
1989

18. Observation of psi production in e+e- annihilation at 29 GeV.

Author

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

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

Inclusive production in e+e- annihilation at 29 GeV has been measured with the Mark II detector. The cross section is found to be 1.10.50.4 pb. After subtraction of the expected contribution from B decay, an upper limit of 0.02 is obtained for other sources of production. © 1988 The American Physical Society.

Published
1988

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