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1. Inclusive charged hadron and K0 production in two-photon interactions

Author

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

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

The inclusive transverse momentum distributions of charged hadrons and K0's produced in tagged photon-photon collisions, are measured and compared to model calculations up to a pT of 5 GeV/c. The relative abundance of K0's favor the inclusion of charm. © 1993.

Published
1993

2. Inclusive Charged Hadron and K{sup 0} Production in Two-Photon Interactions

Author

Cords, D., Boyer, J., Butler, F., Gidal, G., Abrams, G.S., Amidei, D., Baden, A.R., Barklow, T., Boyarski, A.M., Burchat, P.R., Burke, D.L., Dorfan, J.M., Feldman, G.J., Gladney, L., Gold, M.S., Goldhaber, G., Haggerty, J., Hanson, G., Hayes, K., Herrup, D., Hollebeek, R.J., Innes, W.R., Jaros, J.A., Juricic, I., Kadyk, J.A., Karlen, D., Lankford, A.J., Larsen, R.R., LeClaire, B.W., Levi, M.E., Lockyer, N.S., Luth, V., Nelson, M.E., Ong, R.A., Perl, M.L., Riles, K., Rowson, P.C., Schaad, T., Schellman, H., Scmidke, W.B., Trilling, G.H., Wood, D.R., and Yelton, J.M.

Published
1992

3. Search for the production of the final states τ+τ-e+e-, τ+τ-μ+μ-, and τ+τ-π+π- in e+e- collisions at √s =29 GeV

Author

Barklow, T, Innes, WR, Petradza, M, Snyder, A, Stoker, DP, Wagner, SR, Abrams, GS, Amidei, D, Baden, AR, Boyarski, AM, Boyer, J, Burchat, PR, Burke, DL, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, LJ, Haggerty, J, Hanson, G, Hayes, K, Herrup, D, Hollebeek, RJ, Jaros, JA, Juricic, I, 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
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have searched for the reaction e+e-, where f is either an electron, muon, or charged pion, at s =29 GeV using the Mark II detector at the SLAC PEP storage ring. One candidate event is found while 2.3 events are expected from known processes. We would expect to see 11 events if the cross section for e+e- at s=29 GeV were enhanced by the factor of 4.7 which the ALEPH Collaboration reports for s=91 GeV. We also look for e+e- and e+e-, and for e+e-, using a similar analysis procedure, and see the number of events predicted by the standard model. © 1992 The American Physical Society.

Published
1992

4. Search for the production of the final states tau + tau -e+e-, tau + tau - micro+ micro-, and tau + tau - pi + pi - in e+e- collisions at sqrt s =29 GeV.

Author

Barklow, T, Innes, WR, Petradza, M, Snyder, A, Stoker, DP, Wagner, SR, Abrams, GS, Amidei, D, Baden, AR, Boyarski, AM, Boyer, J, Burchat, PR, Burke, DL, Butler, F, Dorfan, JM, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, LJ, Haggerty, J, Hanson, G, Hayes, K, Herrup, D, Hollebeek, RJ, Jaros, JA, Juricic, I, 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
General Physics, Physical Sciences, Mathematical Sciences, Engineering
Abstract

We have searched for the reaction e+e-, where f is either an electron, muon, or charged pion, at s =29 GeV using the Mark II detector at the SLAC PEP storage ring. One candidate event is found while 2.3 events are expected from known processes. We would expect to see 11 events if the cross section for e+e- at s=29 GeV were enhanced by the factor of 4.7 which the ALEPH Collaboration reports for s=91 GeV. We also look for e+e- and e+e-, and for e+e-, using a similar analysis procedure, and see the number of events predicted by the standard model. © 1992 The American Physical Society.

Published
1992

5. Search for elastic nondiagonal lepton-pair production in e+e- annihilation at √s =29 GeV

Author

Gomez-Cadenas, JJ, Heusch, CA, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Golding, L, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Himel, T, Hoenk, M, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koide, A, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Li, Z, Litke, AM, Lockyer, NS, Lüth, V, Matteuzzi, C, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O’Shaughnessy, KF, Parker, SI, Peck, C, Petersen, A, Petradza, M, Porter, FC, Rankin, P, and Richter, B

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have searched for the annihilation of e+e- into the exclusive channels e and at s =29 GeV, using 226 and 133 pb-1, respectively, of data taken with the Mark II detector at the SLAC storage ring PEP. The resulting candidate sample is compatible with the expected background from pair production. Our analysis yields 95%-C.L. cross-section limits of e/

Published
1991

6. Search for elastic nondiagonal lepton-pair production in e+e- annihilation at sqrt s =29 GeV.

Author

Gomez-Cadenas, JJ, Heusch, CA, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Golding, L, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Himel, T, Hoenk, M, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, and Jaffre, M

Subjects
General Physics, Physical Sciences
Abstract

We have searched for the annihilation of e+e- into the exclusive channels e and at s =29 GeV, using 226 and 133 pb-1, respectively, of data taken with the Mark II detector at the SLAC storage ring PEP. The resulting candidate sample is compatible with the expected background from pair production. Our analysis yields 95%-C.L. cross-section limits of e/

Published
1991

7. Measurement of the total hadronic cross section in e+e- annihilation at sqrt s =29 GeV.

Author

von Zanthier C, de Boer W, Grindhammer, G, Hylen, J, Harral, B, Hearty, C, Labarga, L, Matthews, J, Schaad, M, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Glanzman, T, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, and Hutchinson, D

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 precise measurement of the ratio R of the total cross section e+e-hadrons to the pointlike cross section e+e-+- at a center-of-mass energy of 29.0 GeV is presented. The data were taken with the upgraded Mark II detector at the SLAC storage ring PEP. The result is R=3.920.050.09. The luminosity has been determined with three independent luminosity monitors measuring Bhabha scattering at different angular intervals. Recent calculations of higher-order QED radiative corrections are used to estimate the systematic error due to missing higher-order radiative corrections in the Monte Carlo event generators. © 1991 The American Physical Society.

Published
1991

8. Measurement of the total hadronic cross section in e+e- annihilation at s=29 GeV

Author

von Zanthier, C, de Boer, W, Grindhammer, G, Hylen, J, Harral, B, Hearty, C, Labarga, L, Matthews, J, Schaad, M, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Glanzman, T, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hutchinson, D, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, Levi, ME, Li, Z, Litke, AM, Lüth, V, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Riles, K, Rust, DR, Sadrozinski, HFW, and Schalk, TL

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

A precise measurement of the ratio R of the total cross section e+e-hadrons to the pointlike cross section e+e-+- at a center-of-mass energy of 29.0 GeV is presented. The data were taken with the upgraded Mark II detector at the SLAC storage ring PEP. The result is R=3.920.050.09. The luminosity has been determined with three independent luminosity monitors measuring Bhabha scattering at different angular intervals. Recent calculations of higher-order QED radiative corrections are used to estimate the systematic error due to missing higher-order radiative corrections in the Monte Carlo event generators. © 1991 The American Physical Society.

Published
1991

9. 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, Hanson, G, Hayes, K, Herrup, D, Himel, T, Hollebeek, RJ, Innes, WR, Jaros, JA, Kadyk, JA, Karlen, D, Klein, SR, 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
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles 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

10. 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

11. 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

12. Measurement of the two-photon width of the η′(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
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles 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

13. 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

14. A reanalysis of B0-B̄0 mixing in e+e- annihilation at 29 GeV

Author

Weir, AJ, Abrams, G, Adolphsen, CE, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Barish, BC, Barklow, T, Barnett, BA, Bartelt, I, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, Destaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylef, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Litke, AM, Lockyer, NS, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Richter, B, Riles, K, Rowson, PC, Rust, DR, Sadrozinski, HFW, Schaad, T, and Schalk, TL

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

Data taken by the Mark II detector at the PEP storage ring was used to measure the rate of dilepton production in multihadronic events produced by e+e- annihilation at √s=29 GeV. We determine the probability that a hadron initially containing a b (b̄) quark decays to a positive (negative) lepton to be 0.17-0.08+0.15, with 90% confidence level limits of 0.06 and 0.38. © 1990.

Published
1990

15. 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

16. Radiative τ 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
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles 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

17. Measurement of the B0-meson lifetime.

Author

Wagner, SR, Hinshaw, DA, Ong, RA, Snyder, A, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylen, J, and Innes, WR

Subjects
General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

We report a measurement of the lifetime of the B0 meson based upon 29-GeV e+e- annihilation data taken with the Mark II detector at the SLAC storage ring PEP. The B0 mesons are tagged by their decays into D*- and D*+, where the D*- is tagged by its decay into -D 0. We reconstruct the decay vertices of 15 B0-meson candidates and measure the B0 lifetime to be 1.20-0.360.14+0.52+0.16 psec. © 1990 The American Physical Society.

Published
1990

18. Upper limits on D+/- and B+/- decays to two leptons plus pi +/- or K+/-

Author

Weir, AJ, Klein, SR, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, and Jaros, JA

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

Data taken by the Mark II detector at the SLAC e+e- storage ring PEP was used to search for exclusive decays of D and B mesons into two charged leptons plus a charged pion or kaon. All possible charge and lepton combinations consistent with charge conservation were considered and no evidence for any signals was found. We obtain upper limits for the various branching ratios ranging from 2.5×10-3 to 9.2×10-3, at a 90% confidence level. Some of these limits can be used to constrain leptoquark masses in various models. © 1990 The American Physical Society.

Published
1990

19. Upper limits on D± and B± decays to two leptons plus π± or K±

Author

Weir, AJ, Klein, SR, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Litke, AM, Lockyer, NS, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O'Shaughnessy, KF, Parker, SI, Peck, C, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Richter, B, Riles, K, Rowson, PC, Rust, DR, Sadrozinski, HFW, and Schaad, T

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

Data taken by the Mark II detector at the SLAC e+e- storage ring PEP was used to search for exclusive decays of D and B mesons into two charged leptons plus a charged pion or kaon. All possible charge and lepton combinations consistent with charge conservation were considered and no evidence for any signals was found. We obtain upper limits for the various branching ratios ranging from 2.5×10-3 to 9.2×10-3, at a 90% confidence level. Some of these limits can be used to constrain leptoquark masses in various models. © 1990 The American Physical Society.

Published
1990

20. Comparison of the particle flow in Three-Jet and radiative Two-Jet Events from e+e- Annihilation at Ec.m.=29 GeV

Author

Sheldon, PD, Trilling, GH, Petersen, A, 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, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, M, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, de la Vaissiere, C, Wood, DR, Yelton, JM, and Zaiser, C

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have made a detailed comparison of the charged-particle flow in three-jet events (e+e-qq»g) and radiative two-jet events (e+e-qq») from e+e- annihilation at Ec.m.=29 GeV. Accurate comparisons can be made because these two event types have similar topologies. In the angular region between the quark and antiquark jets, we observe substantially fewer charged tracks in the two-jet events than in the radiative three-jet events. © 1986 The American Physical Society.

Published
1986

21. Measurement of the Branching Fraction for τ-→5π±(π0)ντ and an Upper Limit on the ντ Mass

Author

Burchat, PR, Schmidke, WB, Yelton, JM, Abrams, G, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Breidenbach, M, 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, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, M, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Rowson, PC, Schaad, T, Schellman, H, Sheldon, PD, Trilling, GH, de la Vaissiere, C, Wood, DR, and Zaiser, C

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The branching fraction for -5(0) is measured from data accumulated with the Mark II detector at PEP. Four events are observed with an estimated hadronic background of (0.03-0.02+0.04) events and a background from -30 of (0.05-0.04+0.07) events. This results in a measured branching fraction of (0.160.080.04)%. The candidate events are used to establish an upper limit of 125 MeV/c2 on the mass at the 95% confidence level. © 1985 The American Physical Society.

Published
1985

22. η and η′ Production in e+e- Annihilation at 29 GeV. Evidence for the Ds± Decays into ηπ± and η′π±

Author

Wormser, G, 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, 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
Down Syndrome, Intellectual and Developmental Disabilities (IDD), Brain Disorders, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The Production has been investigated by the Mark II collaboration at the SLAC e+e- storage ring PEP. particles are reconstructed by their decay mode. The fragmentation function has been measured and found to be in good agreement with the Lund-model prediction. production has been measured for the first time in high-energy e+e- annihilation. There is evidence at the 3 level for Ds± decay into ± and ±. © 1988 The American Physical Society.

Published
1988

23. Inclusive Lepton Production in e+e- Annihilation at 29 GeV

Author

Ong, RA, Weir, AJ, Abrams, GS, 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, Nelson, ME, Perl, ML, Petersen, A, Richter, B, Riles, K, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, Wood, DR, and Yelton, JM

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We use data taken by the Mark II detector at the SLAC storage ring PEP to study inclusive lepton production in e+e- annihilation at 29 GeV. From fits to the inclusive lepton momentum and transverse-momentum spectra we measure the semileptonic branching ratios for charm and bottom hadrons. We also determine with good precision the mean value of the bottom fragmentation function using both electron and muon samples. © 1988 The American Physical Society.

Published
1988

24. Measurement of the branching fractions τ-→ρ-ντ and τ-→K-ντ

Author

Yelton, JM, Dorfan, JM, Abrams, GS, Amidel, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Breidenbach, M, Burchat, P, Burke, DL, Butler, F, Feldman, GJ, Gladney, LD, Gidal, G, 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, Lankford, AJ, Larsen, RR, Leclaire, BW, Levi, ME, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Rowson, PC, Schadd, T, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, de la Vaissiere, C, Wood, DR, and Zaiser, C

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have measured the branching fraction of -'-1/2 to be (22.3±0.6±1.4)% and the branching fraction of -'K*-1/2 to be (1.3±0.3±0.3)%. These values are consistent with the expectations for conventional decays of the . © 1986 The American Physical Society.

Published
1986

25. First measurements of hadronic decays of the Z boson

Author

Abrams, GS, Adolphsen, CE, Aleksan, R, Alexander, JP, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, de Boer, W, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Drewer, DC, Elia, R, Fay, J, Feldman, GJ, Fernandes, D, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Cadenas, JJ Gomez, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Herrup, D, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Holmgren, S-O, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaffre, M, Jaros, JA, Jung, CK, Kadyk, JA, Karlen, D, Kent, J, King, M, Klein, SR, Koetke, DS, Komamiya, S, Koska, W, Kowalski, LA, Kozanecki, W, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Larsen, RR, Le Diberder, F, Levi, ME, Litke, AM, Lüth, V, Lynch, GR, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, and Nitz, D

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have observed hadronic final states produced in the decays of Z bosons. In order to study the parton structure of these events, we compare the distributions in sphericity, thurst, aplanarity, and number of jets to the predictions of several QCD-based models and to data from lower energies. The data and models agree within the present statistical precision. © 1989 The American Physical Society.

Published
1989

26. Search for Monojet Production in e+e- annihilation

Author

Feldman, GJ, Abrams, GS, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Breidenbach, M, Burchat, P, Burke, DL, Butler, F, Dorfan, JM, 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, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, M, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Rowson, PC, Schaad, T, Schellman, H, Schlatter, D, Schmidke, WB, Sheldon, PD, de la Vaissiere, C, Wood, D, Yelton, JM, and Zaiser, C

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We report results of a search for events of the type e+e-jet+missing transverse momentum using the Mark II detector at PEP. Two candidate events were found, but both could come from known sources of background. A specific model for the origin of UA1 monojet events as the decay of a Z boson into two light Higgs bosons is eliminated by this search. © 1985 The American Physical Society.

Published
1985

27. Λ Production in e+e- Annihilation at 29 GeV

Author

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

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The production of hyperons in e+e- annihilation has been measured as a function of their total momenta, transverse momenta, and the event thrust. The total production rate is 0.2130.0120.018 or per hadronic event. The observation of correlations in rapidity and angles for events with two detected decays supports fragmentation models with local baryon-number compensation. © 1985 The American Physical Society.

Published
1985

28. 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
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles 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

29. Study of the Decay τ-→π-π-π+ντ

Author

Schmidke, WB, Abrams, GS, Matteuzzi, C, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Breidenbach, M, Burchat, PR, Burke, DL, Butler, F, Dieterle, WE, Dorfan, JM, Feldman, GJ, Gidal, G, Gladney, L, Gold, MS, Goldhaber, G, Golding, LJ, 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, ME, Lockyer, NS, Lüth, V, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Rowson, PC, Schaad, T, Schellman, H, Sheldon, PD, Trilling, GH, de la Vaissiere, C, Wood, DR, Yelton, JM, and Zaiser, C

Subjects
Brain Disorders, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The branching ratios for + and -(n0), n>~1, have been measured to be 0.078 0.005 0.008 and 0.047 ± 0.005 ± 0.008, respectively. The total three-prong tau branching ratio is 0.128 ± 0.005 ± 0.008. Study of the 3± decay indicates that the three pions are predominantly from a JP=1+ state which decays through a 0± intermediate state in a relative s wave. The mass spectrum is suggestive of a resonance. © 1986 The American Physical Society.

Published
1986

30. Limit on the decay D0→eμ∓

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

We have searched for the lepton-flavor-violating decay D0e in 204 pb-1 of e+e- annihilation data at Ec.m.=29 GeV from the Mark II detector. No candidates were found; we estimate an upper limit on the cross section times branching ratio of (e+e-D0,D0; inclusive)B(D0e)

Published
1987

31. Measurement of the D0 Lifetime

Author

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

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have used an electronic tracking system to measure the lifetime of D0 mesons produced in e+e- annihilation at 29 GeV. Based on a sample of 27 events, the lifetime is found to be (4.2-1.0+1.3 1.0) × 10-13 s. © 1984 The American Physical Society.

Published
1984

32. Measurement of the Lifetime of Bottom Hadrons

Author

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

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The average lifetime of bottom hadrons was measured with the Mark II vertex detector at the storage ring PEP. The lifetime was determined by measuring the impact parameters of leptons produced in bottom decays. τb=(12.0-3.6+4. 5±3.0)×10-13 sec was found. © 1983 The American Physical Society.

Published
1983

33. Search for B-decay to Higgs bosons for Higgs boson masses between 50 and 210 MeV/c2

Author

Snyder, A, Murray, WN, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidel, D, Baden, AR, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, Destaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, Leclaire, BW, Levi, ME, Litke, AM, Lockyer, NS, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Richter, B, Riles, K, Rowson, PC, Rust, DR, Sadrozinski, HFW, and Schaad, T

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

We use data from the Mark II experiment at PEP to search for the process B→h0X for mh0 between 50 and 210 MeV/c2. No evidence for the Higgs boson is seen in this mass range. The limit obtained rules out the standard Higgs boson for masses between 70 and 210 MeV/c2 and significantly constrains extensions of the Higgs sector. © 1989.

Published
1989

34. The Mark II detector for the SLC

Author

Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Averill, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, De Boer, W, Bonvicini, G, Boswell, C, Boyarski, A, Boyer, J, Brabson, B, Braune, K, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, Destaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Drewer, DC, Fay, J, Feldman, GJ, Fernandes, D, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gatto, C, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Cadenas, JJ Gomez, Gong, X, Gratta, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Herrup, D, Heusch, CA, Himel, T, Hinshaw, DA, Hoenk, M, Holmgren, S-O, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaffre, M, Jaros, JA, Jung, CK, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, King, M, Klein, SR, Koepke, L, Koetke, D, Koide, A, Komamiya, S, Koska, W, Kowalski, LA, Kozanecki, W, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Larsen, RR, Levi, ME, and Li, Z

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

The Mark II detector has been upgraded in preparation for its role as the first detector to take data at the Stanford Linear Collider. The new detector components include the central drift chamber, the time-of-flight system, the coil, the endcap electromagnetic calorimeters and the beam energy and luminosity measuring devices. There have also been improvements in detector hermeticity. All of the major components were installed for a test run at the PEP storage ring (√s = 29 GeV) in 1985. This paper describes the upgraded detector, including its trigger and data acquisition systems, and gives performance figures for its components. Future improvements are also discussed. © 1989.

Published
1989

35. Measurement of the branching fraction for tau --->5 pi +/-( pi 0) nu tau and an upper limit on the nu tau mass.

Author

Burchat, PR, Schmidke, WB, Yelton, JM, Abrams, G, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Boyer, J, Breidenbach, M, 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, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, M, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Ross, MC, Rowson, PC, Schaad, T, Schellman, H, Sheldon, PD, Trilling, GH, de la Vaissiere C, Wood, DR, and Zaiser, AC

Subjects
General Physics, Physical Sciences
Abstract

The branching fraction for -5(0) is measured from data accumulated with the Mark II detector at PEP. Four events are observed with an estimated hadronic background of (0.03-0.02+0.04) events and a background from -30 of (0.05-0.04+0.07) events. This results in a measured branching fraction of (0.160.080.04)%. The candidate events are used to establish an upper limit of 125 MeV/c2 on the mass at the 95% confidence level. © 1985 The American Physical Society.

Published
1985

36. Search for a Nearly Degenerate Lepton Doublet

Author

Riles, K., Perl, M.L., Barklow, T., Boyarski, A., Burchat, P.R., Burke, D.L., Dorfan, J.M., Feldman, G.J., Gladney, L., Hanson, G., Hayes, K., Hollebeek, R.J., Innes, W.R., Jaros, J.A., Karlen, D., Klein, S.R., Lankford, A.J., Larsen, R.R., LeClaire, B.W., Lockyer, N.S., Luth, V., Ong, R.A., Richter, B., Yelton, J.M., Abrams, G., Amidei, D., Baden, A.R., Boyer, J., Butler, F., Gidal, G., Gold, M.S., Goldhaber, G., Golding, L., Haggerty, J., Herrup, D., Juricic, I., Kadyk, J.A., Levi, M.E., Nelson, M.E., Rowson, P.C., Schellman, H., Schmidke, W.B., Sheldon, P.D., Trilling, G.H., Wood, D.R., and Schaad, T.

Published
1989

37. eta and eta ' production in e+e- annihilation at 29 GeV. Evidence for the Dx+/- decays into eta pi +/- and eta ' pi +/-

Author

Wormser, G, 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, 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
General Physics, Physical Sciences
Abstract

The Production has been investigated by the Mark II collaboration at the SLAC e+e- storage ring PEP. particles are reconstructed by their decay mode. The fragmentation function has been measured and found to be in good agreement with the Lund-model prediction. production has been measured for the first time in high-energy e+e- annihilation. There is evidence at the 3 level for Ds± decay into ± and ±. © 1988 The American Physical Society.

Published
1988

38. Study of tau decay modes with multiple neutral mesons in the final states.

Author

Gan, KK, Abrams, GS, 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, ME, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Ong, RA, Perl, ML, 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
General Physics, Physical Sciences, Mathematical Sciences, Engineering
Abstract

The decay modes with multiple neutral mesons in the final states have been studied with the Mark II detector at the SLAC storage ring PEP. The branching ratio for the decay mode - 20 is found to be consistent with the theoretical expectation. However, the branching ratio for - 30 is found to be inconsistent with the theoretical prediction unless there are other decay modes with multiple neutral mesons in the final states. © 1987 The American Physical Society.

Published
1987

39. Determination of alpha s from energy-energy correlations in e+e- annihilation at 29 GeV.

Author

Wood, DR, Petersen, A, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Golding, L, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hollebeek, RJ, Hutchinson, D, Hylen, J, and Innes, WR

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

We have studied the energy-energy correlation in e+e- annihilation into hadrons at s =29 GeV using the Mark II detector at the SLAC storage ring PEP. We find to O(s2) that s=0.1580.0030.008 if hadronization is described by string fragmentation. Independent fragmentation schemes give s=0.100.14, and give poor agreement with the data. A leading-log shower fragmentation model is found to describe the data well. © 1988 The American Physical Society.

Published
1988

40. 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

41. 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

42. Studies of jet production rates ine+e− annihilation atEcm=29 GeV

Author

Bethke, S, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bullos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, F, Fujino, D, Gan, KK, Gidal, G, Glanzman, T, Goldhaber, G, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Komamiya, S, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, Levi, ME, Li, Z, Litke, AM, Lüth, V, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Petersen, A, Petradza, M, Porter, FC, Rankin, P, Riles, K, Rust, DR, Sadrozinski, HFW, Schalk, TL, Schmidke, WB, Schwarz, AS, Seiden, A, Smith, JG, Snyder, A, and Soderstrom, E

Subjects
Nuclear & Particles Physics
Abstract

Production rates of multijet hadronic final states are studied in e+e- annihilation at 29 GeV center of mass energy. QCD shower model calculations with exact first order matrix element weighting at the first gluon vertex are capable of reproducing the observed multijet event rates over a large range of jet pair masses. The method used to reconstruct jets is well suited for directly comparing experimental jet rates with parton rates calculated in perturbative QCD. Evidence for the energy dependene of αs is obtained by comparing the observed production rates of 3-jet events with results of similar studies performed at higher center of mass energies. © 1989 Springer-Verlag.

Published
1989

43. Multihadronic events at Ec.m.=29 GeV and predictions of QCD models from Ec.m.=29 GeV to Ec.m.=93 GeV

Author

Petersen, A, Abrams, G, Adolphsen, CE, Akerlof, C, Alexander, JP, Alvarez, M, Amidei, D, Baden, AR, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Blockus, D, Bonvicini, G, Boyarski, A, Boyer, J, Brabson, B, Breakstone, A, Brom, JM, Bulos, F, Burchat, PR, Burke, DL, Butler, F, Calvino, F, Cence, RJ, Chapman, J, Cords, D, Coupal, DP, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drell, PS, Feldman, GJ, Fernandez, E, Field, RC, Ford, WT, Fordham, C, Frey, R, Fujino, D, Gan, KK, Gidal, G, Gladney, L, Glanzman, T, Gold, MS, Goldhaber, G, Golding, L, Green, A, Grosse-Wiesmann, P, Haggerty, J, Hanson, G, Harr, R, Harris, FA, Hawkes, CM, Hayes, K, Herrup, D, Heusch, CA, Himel, T, Hoenk, M, Hollebeek, RJ, Hutchinson, D, Hylen, J, Innes, WR, Jaffre, M, Jaros, JA, Juricic, I, Kadyk, JA, Karlen, D, Kent, J, Klein, SR, Koide, A, Koska, W, Kozanecki, W, Lankford, AJ, Larsen, RR, LeClaire, BW, Levi, ME, Li, Z, Litke, AM, Lockyer, NS, Matteuzzi, C, Matthews, JAJ, Meyer, DI, Milliken, BD, Moffeit, KC, Müller, L, Nash, J, Nelson, ME, Nitz, D, Ogren, H, Ong, RA, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Porter, FC, Rankin, P, Richter, B, and Riles, K

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

Multihadronic e+e- annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, Q2-Q1, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, p, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing e+e- data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the Z0, are also presented. © 1988 The American Physical Society.

Published
1988

44. 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

45. Observation of spin-1 f1(1285) in the reaction gamma gamma *--> eta 0 pi + pi -

Author

Gidal, G, Boyer, J, Butler, F, Cords, D, Abrams, GS, Amidei, D, Baden, AR, Barklow, T, Boyarski, AM, Burchat, P, Burke, DL, Dorfan, JM, Feldman, GJ, Gladney, L, Gold, MS, Goldhaber, G, Golding, LJ, 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, ME, Lockyer, NS, Lüth, V, Matteuzzi, C, Nelson, ME, Ong, RA, Perl, ML, Richter, B, Riles, K, Rowson, PC, Schaad, T, Schellman, H, Schmidke, WB, Sheldon, PD, Trilling, GH, de la Vaissière C, Wood, DR, Yelton, JM, and Zaiser, C

Subjects
General Physics, Physical Sciences, Mathematical Sciences, Engineering
Abstract

We observe both the JPC=1++ f1(1285) and the JPC=0-+ (958) in tagged two-photon interactions and the (958) in untagged interactions. The measured Q2 dependence and decay distribution support the f1(1285) spin and parity assignment. The radiative width of the f1(1285) is measured as (M2/Q2)*=9.4±2.5±1.7 keV, on the assumption of a -pole form factor. © 1987 The American Physical Society.

Published
1987

46. 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

47. Lambda production in e+e- annihilation at 29 GeV.

Author

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

Subjects
General Physics, Physical Sciences, Mathematical Sciences, Engineering
Abstract

The production of hyperons in e+e- annihilation has been measured as a function of their total momenta, transverse momenta, and the event thrust. The total production rate is 0.2130.0120.018 or per hadronic event. The observation of correlations in rapidity and angles for events with two detected decays supports fragmentation models with local baryon-number compensation. © 1985 The American Physical Society.

Published
1985

48. Charged multiplicity of hadronic events containing heavy-quark jets.

Author

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

Subjects
General Physics, Physical Sciences, Mathematical Sciences, Engineering
Abstract

The charged-particle multiplicities of hadronic events deriving from produced bottom or charm quarks have been measured in the Mark II detector at PEP in e+e- annihilation at 29 GeV. For events containing one semileptonic and one hadronic weak decay, we find multiplicities of 15.20.50.7 for bottom and 13.00.50.8 for charm. The corresponding multiplicities of charged particles accompanying the pair of heavy hadrons are 5.20.50.9 for bottom, and 8.10.50.9 for charm. © 1985 The American Physical Society.

Published
1985

49. 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

50. 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

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