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1. Further Search for the Two-Photon Production of the Glueball Candidate fJ(2220)

Author

Alam, MS, Athar, SB, Ling, Z, Mahmood, AH, Timm, S, Wappler, F, Anastassov, A, Duboscq, JE, Gan, KK, Hart, T, Honscheid, K, Kagan, H, Kass, R, Lee, J, Schwarthoff, H, Spencer, MB, Wolf, A, Zoeller, MM, Richichi, SJ, Severini, H, Skubic, P, Undrus, A, Bishai, M, Fast, J, Hinson, JW, Menon, N, Miller, DH, Shibata, EI, Shipsey, IPJ, Glenn, S, Kwon, Y, Lyon, AL, Roberts, S, Thorndike, EH, Jessop, CP, Lingel, K, Marsiske, H, Perl, ML, Savinov, V, Ugolini, D, Zhou, X, Coan, TE, Fadeyev, V, Korolkov, I, Maravin, Y, Narsky, I, Shelkov, V, Staeck, J, Stroynowski, R, Volobouev, I, Ye, J, Artuso, M, Dambasuren, E, Efimov, A, Kopp, S, Moneti, GC, Mountain, R, Schuh, S, Skwarnicki, T, Stone, S, Titov, A, Viehhauser, G, Wang, JC, Bartelt, J, Csorna, SE, McLean, KW, Marka, S, Godang, R, Kinoshita, K, Lai, IC, Pomianowski, P, Schrenk, S, Bonvicini, G, Cinabro, D, Greene, R, Perera, LP, Zhou, GJ, Chadhha, M, Chan, S, Eigen, G, Miller, JS, Schmidtler, M, Urheim, J, Weinstein, AJ, Würthwein, F, Bliss, DW, Jaffe, DE, Masek, G, Paar, HP, Potter, EM, Prell, S, Sivertz, M, Sharma, V, Asner, DM, Gronberg, J, Hill, TS, Lange, DJ, Morrison, RJ, Nelson, HN, and Nelson, TK

Subjects
hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The CLEO II detector at the e+e− storage ring CESR has been used to search for two-photon production of the fJ(2220) decaying into π+π−. No evidence for a signal is found in 4.77fb−1 of data and a 95% C.L. upper limit on [τγγBπ+π−]fJ(2220) of 2.5 eV is set. If this result is combined with the BES Collaboration's measurement of fJ(2220)→π+π− in radiative J/Ψ decay and the recent CLEO result for [τγγBK0SK0S]fJ(2220), a 95% C.L. lower limit on the stickiness of 102 is obtained. This result for the stickiness provides further support for a substantial neutral parton content in the fJ(2220). © 1998 The American Physical Society.

Published
1998

2. Study of gluon versus quark fragmentation in Υ→ggγ and e+e-→qq¯γ events at s=10 GeV

Author

Alam, MS, Athar, SB, Ling, Z, Mahmood, AH, Severini, H, Timm, S, Wappler, F, Anastassov, A, Blinov, S, Duboscq, JE, Fujino, D, Fulton, R, Gan, KK, Hart, T, Honscheid, K, Kagan, H, Kass, R, Lee, J, Spencer, MB, Sung, M, Undrus, A, Wanke, R, Wolf, A, Zoeller, MM, Nemati, B, Richichi, SJ, Ross, WR, Skubic, P, Wood, M, Bishai, M, Fast, J, Gerndt, E, Hinson, JW, Menon, N, Miller, DH, Shibata, EI, Shipsey, IPJ, Yurko, M, Gibbons, L, Johnson, SD, Kwon, Y, Roberts, S, Thorndike, EH, Jessop, CP, Lingel, K, Marsiske, H, Perl, ML, Schaffner, SF, Ugolini, D, Wang, R, Zhou, X, Coan, TE, Fadeyev, V, Korolkov, I, Maravin, Y, Narsky, I, Shelkov, V, Staeck, J, Stroynowski, R, Volobouev, I, Ye, J, Artuso, M, Efimov, A, Frasconi, F, Gao, M, Goldberg, M, He, D, Kopp, S, Moneti, GC, Mountain, R, Mukhin, Y, Schuh, S, Skwarnicki, T, Stone, S, Viehhauser, G, Xing, X, Bartelt, J, Csorna, SE, Jain, V, Marka, S, Freyberger, A, Gibaut, D, Godang, R, Kinoshita, K, Lai, IC, Pomianowski, P, Schrenk, S, Bonvicini, G, Cinabro, D, Greene, R, Perera, LP, Barish, B, Chadha, M, Chan, S, Eigen, G, Miller, JS, Grady, C O’, Schmidtler, M, Urheim, J, and Weinstein, AJ

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

Using data collected with the CLEO II detector at the Cornell Electron Storage Ring, we determine the ratio [Formula presented] for the mean charged multiplicity observed in [Formula presented] events, [Formula presented], to the mean charged multiplicity observed in [Formula presented] events, [Formula presented]. We find [Formula presented] [Formula presented] for jet-jet masses less than 7 GeV. © 1997 The American Physical Society.

Published
1997

3. Study of gluon versus quark fragmentation in [Formula presented] and [Formula presented] events at [Formula presented]=10 GeV

Author

Alam, MS, Athar, SB, Ling, Z, Mahmood, AH, Severini, H, Timm, S, Wappler, F, Anastassov, A, Blinov, S, Duboscq, JE, Fujino, D, Fulton, R, Gan, KK, Hart, T, Honscheid, K, Kagan, H, Kass, R, Lee, J, Spencer, MB, Sung, M, Undrus, A, Wanke, R, Wolf, A, Zoeller, MM, Nemati, B, Richichi, SJ, Ross, WR, Skubic, P, Wood, M, Bishai, M, Fast, J, Gerndt, E, Hinson, JW, Menon, N, Miller, DH, Shibata, EI, Shipsey, IPJ, Yurko, M, Gibbons, L, Johnson, SD, Kwon, Y, Roberts, S, Thorndike, EH, Jessop, CP, Lingel, K, Marsiske, H, Perl, ML, Schaffner, SF, Ugolini, D, Wang, R, Zhou, X, Coan, TE, Fadeyev, V, Korolkov, I, Maravin, Y, Narsky, I, Shelkov, V, Staeck, J, Stroynowski, R, Volobouev, I, Ye, J, Artuso, M, Efimov, A, Frasconi, F, Gao, M, Goldberg, M, He, D, Kopp, S, Moneti, GC, Mountain, R, Mukhin, Y, Schuh, S, Skwarnicki, T, Stone, S, Viehhauser, G, Xing, X, Bartelt, J, Csorna, SE, Jain, V, Marka, S, Freyberger, A, Gibaut, D, Godang, R, Kinoshita, K, Lai, IC, Pomianowski, P, Schrenk, S, Bonvicini, G, Cinabro, D, Greene, R, Perera, LP, Barish, B, Chadha, M, Chan, S, Eigen, G, Miller, JS, Grady, CO, Schmidtler, M, Urheim, J, and Weinstein, AJ

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

Using data collected with the CLEO II detector at the Cornell Electron Storage Ring, we determine the ratio [Formula presented] for the mean charged multiplicity observed in [Formula presented] events, [Formula presented], to the mean charged multiplicity observed in [Formula presented] events, [Formula presented]. We find [Formula presented] [Formula presented] for jet-jet masses less than 7 GeV. © 1997 The American Physical Society.

Published
1997

4. 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

5. Measurement of the charged multiplicity of events containing bottom hadrons at Ec. m.=91 GeV

Author

Schumm, BA, Koetke, DS, Adolphsen, CE, Alexander, JP, Averill, D, Barish, BC, Barklow, T, Barnett, BA, Blockus, D, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, JM, Drell, PS, Drewer, DC, Durrett, D, Elia, R, Feldman, GJ, 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, Hanson, G, Harr, R, Harral, B, Harris, FA, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kenney, C, King, M, Komamiya, S, Kowalski, LA, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Le Diberder, F, Levi, ME, Litke, AM, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Pitthan, R, Porter, FC, Rankin, P, Rouse, FR, Rust, DR, Sadrozinski, HFW, Schwarz, AS, Seiden, A, Smith, JG, Snyder, A, Soderstrom, E, Stoker, DP, Stroynowski, R, Swartz, M, Thun, R, and Trilling, GH

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

Using an impact-parameter tag to select an enriched sample of Z0bb» events, we have measured the difference between the average charged multiplicity of bb» and all hadronic Z0 decays to be 2.11.8(stat) 0.6(syst) tracks per event. The resulting total (nonleading) charged multiplicity for Z0 bb» events is 23.1(12.0)1.8 0.6 tracks. A comparison of this nonleading multiplicity to hadronic multiplicity data in the range of 10 to 60 GeV supports the hypothesis of flavor-independent hadronic fragmentation, and yields a measurement of the average energy fraction of bottom hadrons in Z0 decays of xEb=0.620.100.04. © 1992 The American Physical Society.

Published
1992

6. 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

7. 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

8. Measurement of the bb¯ fraction in hadronic Z0 decays with precision vertex detectors

Author

Jacobsen, RG, Koetke, DS, Adolphsen, CE, Fujino, D, Schumm, BA, Wagner, SR, Alexander, JP, Averill, D, Barish, BC, Barklow, T, Barnett, BA, Blockus, D, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, JM, Drell, PS, Drewer, DC, Durrett, D, Elia, R, Feldman, GJ, Field, RC, Ford, WT, Fordham, C, Frey, R, Gan, KK, Gero, E, Gidal, G, Glanzman, T, Goldhaber, G, Cadenas, JJ Gomez, Gratta, G, Hanson, G, Harr, R, Harral, B, Harris, FA, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jaros, JA, Jung, CK, Kadyk, JA, Kenney, C, King, M, Komamiya, S, Kowalski, LA, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Le Diberder, F, Levi, ME, Litke, AM, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Pitthan, R, Porter, FC, Rankin, P, Rust, DR, Sadrozinski, HFW, Schwarz, AS, Seiden, A, Smith, JG, Snyder, A, Soderstrom, E, Stoker, DP, Stroynowski, R, Swartz, M, Thun, R, and Trilling, GH

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

We have measured the fraction of bb» events in hadronic Z0 decays, Rbb», using the vertex detector system of the Mark II detector at the SLAC Linear Collider. We tag bb» events by requiring the coincidence of three or more tracks with significant impact parameters. This tag is 50% efficient and results in a sample of 85% purity. We find Rbb»=0.251+0.049+0.030, in good agreement with other measurements and the standard model prediction. © 1991 The American Physical Society.

Published
1991

9. 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

10. 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

11. 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

12. 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

13. 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

14. 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

15. Direct search for pair production of heavy stable charged particles in Z decays

Author

Soderstrom, E, McKenna, JA, Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, 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, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kent, J, King, M, 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, Lou, XC, Lüth, V, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Pitthan, R, Porter, FC, Rankin, P, Riles, K, and Rouse, FR

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

A search for pair production of stable charged particles from Z decay has been performed with the Mark II detector at the SLAC Linear Collider. Particle masses are determined from momentum, ionization energy loss, and time-of-flight measurements. A limit excluding pair production of stable fourth-generation charged leptons and stable mirror fermions with masses between the muon mass and 36.3 GeV/c2 is set at the 95% confidence level. Pair production of stable supersymmetric scalar leptons with masses between the muon mass and 32.6 GeV/c2 is also excluded. © 1990 The American Physical Society.

Published
1990

16. Searches for supersymmetric particles produced in Z-boson decay

Author

Barklow, T, Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, Feldman, GJ, Fernandes, D, 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, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kent, J, King, M, 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, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Pitthan, R, Porter, FC, Rankin, P, Riles, K, and Rouse, FR

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

We have searched for supersymmetric particles in 528 Z decays with the Mark II detector at the SLAC Linear Collider. We place 95%-confidence-level lower mass limits on degenerate squarks, nondegenerate up-type squarks, nondegenerate down-type squarks, charginos, pair-produced unstable neutralinos, and neutralinos from associated production. © 1990 The American Physical Society.

Published
1990

17. Search for nonminimal neutral Higgs bosons from Z-boson decays

Author

Komamiya, S, Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, Feldman, GJ, Fernandes, D, 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, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kent, J, King, M, Klein, SR, Koetke, DS, Koska, W, Kowalski, LA, Kozanecki, W, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Larsen, RR, Le Diberder, F, Levi, ME, Litke, AM, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Perrier, F, Petradza, M, Pitthan, R, Porter, FC, and Rankin, P

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

Using the Mark II detector at the SLAC Linear Collider, we search for decays of the Z boson to a pair of nonminimal Higgs bosons (ZHs0Hp0), where one of them is relatively light (10 GeV). We find no evidence for these decays and we obtain limits on the ZHs0Hp0 coupling as a function of the Higgs-boson masses. © 1990 The American Physical Society.

Published
1990

18. Search for doubly charged Higgs scalars in Z decay

Author

Swartz, M, Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, Feldman, GJ, Fernandes, D, 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, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, 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, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Perrier, F, Petradza, M, Pitthan, R, and Porter, FC

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

We describe a search for the decay of the Z boson into pairs of doubly charged Higgs bosons with the Mark II detector operating at the SLAC Linear Collider. Each Higgs boson is assumed to decay into a same-sign leptonic pair. No event candidates are found in a sample of 528 Z decays. At the 95% confidence level, this result excludes the region of leptonic coupling gll3×10-7 and Higgs-boson mass 6.5MH 36.5 GeV/c2 for isotriplet (left-handed) Higgs bosons. Isosinglet (right-handed) Higgs bosons are excluded in the same gll interval and in the mass interval 7.3 MH 34.3 GeV/c2. © 1990 The American Physical Society.

Published
1990

19. Search for decays of the Z to unstable neutral leptons with mass between 2.5 and 22 GeV

Author

Burchat, PR, King, M, Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, Feldman, GJ, Fernandes, D, 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, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kent, J, 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, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O'Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Perrier, F, Petradza, M, Pitthan, R, Porter, FC, and Rankin, P

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

Using the sample of neutral vector bosons (Z's) produced at the SLAC Linear Collider and detected with the Mark II detector, we search for the decay of the Z to a pair of particles, one of which decays to two charged particles. The observed number of Z decays with this signature excludes, at a confidence level greater than 95%, the decay of the Z to a pair of fourth-generation Dirac neutrinos with mass between 2.5 and 22 GeV, a decay length less than about 1 cm, and coupling to any of the first three generations of charged leptons. This is the first time the existence of such a lepton coupling to the ± has been excluded by a direct search. © 1990 The American Physical Society.

Published
1990

20. 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

21. 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

22. 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

23. Measurements of charged-particle inclusive distributions in hadronic decays of the Z boson

Author

Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, 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, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, 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, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Perrier, F, Petersen, A, Petradza, M, Pitthan, R, Porter, FC, and Rankin, P

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

We have measured inclusive distributions for charged particles in hadronic decays of the Z boson. The variables chosen for study were charged-particle multiplicity, scaled momentum, and momenta transverse to the sphericity axes. The distributions have been corrected for detector effects and are compared with data from ee- annihilation at lower energies and with the predictions of several QCD-based models. The data are in reasonable agreement with expectations. © 1990 The American Physical Society.

Published
1990

24. Measurement of the bb¯ fraction in hadronic Z decays

Author

Kral, JF, Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, Feldman, GJ, Fernandes, D, 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, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kent, J, King, M, Klein, SR, Koetke, DS, Komamiya, S, Koska, W, Kowalski, LA, Kozanecki, W, Kuhlen, M, Labarga, L, Lankford, AJ, Larsen, RR, Le Diberder, F, Levi, ME, Litke, AM, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Petradza, M, Pitthan, R, Porter, FC, Rankin, P, and Riles, K

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

Using isolated leptons reconstructed in the Mark II detector to tag bb events, we measure the fraction of bb events in hadronic Z0 decays to be 0.23-0.09+0.11, in good agreement with the standard-model prediction of 0.22. We find (Zbb)=0.43-0.17+0.21 GeV. © 1990 The American Physical Society.

Published
1990

25. Search for long-lived massive neutrinos in Z decays

Author

Jung, CK, Van Kooten, R, Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, Feldman, GJ, Fernandes, D, 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, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Kadyk, JA, 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, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Perrier, F, Petradza, M, Pitthan, R, and Porter, FC

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

We search for events in the Mark II detector at SLAC Linear Collider with the topology of a Z boson decaying into a pair of long-lived massive particles. No events that are consistent with the search hypothesis are found. Interpreting the long-lived particle as a sequential Dirac neutrino 4 of the fourth generation, we exclude at the 95% confidence level a significant range of mixing-matrix elements of 4 to other-generation neutrinos for a 4 mass from 10 to 43 GeV/c2. © 1990 The American Physical Society.

Published
1990

26. Determination of αs from a differential-jet-multiplicity distribution in e+e- collisions at √s =29 and 91 GeV

Author

Komamiya, S, Le Diberder, F, Abrams, GS, Adolphsen, CE, Averill, D, Ballam, J, Barish, BC, Barklow, T, Barnett, BA, Bartelt, J, Bethke, S, Blockus, D, Bonvicini, G, Boyarski, A, Brabson, B, Breakstone, A, Bulos, F, Burchat, PR, Burke, DL, Cence, RJ, Chapman, J, Chmeissani, M, Cords, D, Coupal, DP, Dauncey, P, DeStaebler, HC, Dorfan, DE, Dorfan, JM, Drewer, DC, Elia, R, Feldman, GJ, Fernandes, D, 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, Gratta, G, Grindhammer, G, Grosse-Wiesmann, P, Hanson, G, Harr, R, Harral, B, Harris, FA, Hawkes, CM, Hayes, K, Hearty, C, Heusch, CA, Hildreth, MD, Himel, T, Hinshaw, DA, Hong, SJ, Hutchinson, D, Hylen, J, Innes, WR, Jacobsen, RG, Jaros, JA, Jung, CK, Kadyk, JA, Kent, J, King, M, Klein, SR, Koetke, DS, Koska, W, Kowalski, LA, Kozanecki, W, Kral, JF, Kuhlen, M, Labarga, L, Lankford, AJ, Larsen, RR, Levi, ME, Litke, AM, Lou, XC, Lüth, V, McKenna, JA, Matthews, JAJ, Mattison, T, Milliken, BD, Moffeit, KC, Munger, CT, Murray, WN, Nash, J, Ogren, H, O’Shaughnessy, KF, Parker, SI, Peck, C, Perl, ML, Perrier, F, Petradza, M, Pitthan, R, Porter, FC, and Rankin, P

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

We measured the differential jet-multiplicity distribution in e+e- annihilation with the Mark II detector. This distribution is compared with the second-order QCD prediction and s is determined to be 0.1230.0090.005 at ssSMZ (at the SLAC Linear Collider) and 0.1490.0020.007 at ss=29 GeV (at the SLAC storage ring PEP). The running of s between these two center-of-mass energies is consistent with the QCD prediction. © 1990 The American Physical Society.

Published
1990

27. 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

28. 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

29. 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

30. 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

31. 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

32. 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

33. 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

34. 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

35. 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

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

Author

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

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

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

Published
1981

37. Inclusive Electron Production in e+e- Annihilation at 29 GeV

Author

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

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

The total momentum and transverse momentum spectra of electrons in e+e- annihilation at 29 GeV have been measured. The inclusive cross section is determined to be 14.4±1.6±5.2 pb for momenta greater than 2 GeV/c. The average semielectronic branching ratios of charm and bottom quarks are measured to be (6.3±1.2±2.1)% and (11.6±2.1±1.7)%, respectively. The fragmentation function for bottom quarks is determined to be peaked at high z, with zb=0.75±0.05±0.04. © 1983 The American Physical Society.

Published
1983

38. A study of the decayτ−→π−μτ

Author

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

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

We present a high statistics measurement of the branching ratio for the decay τ-→π-μτ using data obtained with the Mark II detector at the SLAC e+e- storage ring SPEAR. We have used events from the center-of-mass energy region 3.52 to 6.7 GeV to determine that B(τ-→π-μτ)=0.117±0.004±0.018. From electron-muon events in the same data sample, we have determined that B(τ-→π-μτ) B(τ-→e--μeμτ)=0.66±0.03±0.11. We present measurements of the mass and spin of the τ and the mass of the τ neutrino based, for the first time, on a hadronic decay mode of the τ. © 1982.

Published
1982

39. Observation of Charmed-Baryon Production in e+e- Annihilation

Author

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

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

A peak in the pK-+ and p»K+- invariant-mass spectra at 2.2850.006 GeV/c2 is observed, which is associated with the lowest-lying charmed baryon (c). A cross section times branching ratio of 0.0370.012 nb at Ec.m.=5.2 GeV is measured with a substantial fraction of the events produced with an equal recoiling mass. New measurements of inclusive p and cross sections are also presented, allowing an estimate of the branching ratio B(c+pK-+)=0.0220.010. © 1980 The American Physical Society.

Published
1980

40. Observation of Scale Breaking in Inclusive Hadron Production by e+e- Annihilation

Author

Patrick, JF, Lüth, V, Siegrist, JL, Abrams, GS, Alam, MS, Amidei, D, Bäcker, A, Blocker, CA, Blondel, A, Boyarski, AM, Breidenbach, M, Burke, DL, Carithers, WC, Chinowsky, W, Coles, MW, Cooper, S, Dieterle, WE, Dillon, JB, Dorenbosch, J, Dorfan, JM, Eaton, MW, Feldman, GJ, Franklin, MEB, Gidal, G, Gladney, L, Goldhaber, G, Golding, LJ, Hanson, G, Hayes, KG, Himel, T, Hitlin, DG, Hollebeek, RJ, Innes, WR, Jaros, JA, Jenni, P, Johnson, AD, Kadyk, JA, Lankford, AJ, Larsen, RR, LeClaire, B, Levi, M, Lockyer, N, Lohr, B, Matteuzzi, C, Millikan, RE, Nelson, ME, Pang, CY, Perl, ML, Richter, B, Roussarie, A, Schaad, T, Schellman, H, Schlatter, D, Schwitters, RF, Strait, J, Taureg, H, Tonutti, M, Trilling, GH, Vella, EN, Vidal, RA, Videau, I, von Dardel, G, Wang, Y, Weiss, JM, Werlen, M, Yelton, JM, Zaiser, C, Zaccone, H, and Zhao, G

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

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

Published
1982

41. Measurement of the Radiative Width of the η′ in Two-Photon Interaction at SPEAR

Author

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

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

Events of the type e+e-e+e-(958) have been observed with the Mark II detector at SPEAR by detecting the decay mode 0. From the observed cross section and known branching fractions of the is =5.91.61.2 keV and the total width is =3009060 keV (statistical and systematic errors). © 1979 The American Physical Society.

Published
1979

42. Measurement of the Branching Fraction for τ→ρν

Author

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

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

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

Published
1979

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

Author

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

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

A high-statistics study of decays into baryon final states has been done with the Mark II detector at SPEAR. A detailed test of baryon-antibaryon decay modes is presented. Substantial resonance formation is observed in multibody decays of the involving baryons. Branching ratios for a large number of decay modes are given, including the radiative decay pp. The flavor-SU(3)-forbidden decays (1385)+charge conjugate are observed with substantial branching ratios. © 1984 The American Physical Society.

Published
1984

44. Observation of the Decay ψ→γρ0ρ0

Author

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

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

The prompt photon decay (3095)+-+- has been studied with the Mark II detector at SPEAR. This channel is found to contain a 00 component with 00 masses concentrated between 1.4 and 2.0 GeV/c2. The branching fraction for the 00 decay with masses less than 2.0 GeV/c2 is measured to be (1.25±0.35±0.40)×10-3. © 1982 The American Physical Society.

Published
1982

45. Observation of the ηc (2980) Produced in the Radiative Decay of the ψ′ (3684)

Author

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

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

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

Published
1980

46. Measurement of High-Energy Direct Photons in ψ Decays

Author

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

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

The inclusive and 0 momentum distributions at the have been measured. Using these data and estimates of production, it is found that (4.1 0.8)% of decays contain a direct photon with energy greater than 60% of the beam energy. The expected momentum distribution for direct photons calculated to lowest order in quantum chromodynamics is qualitatively different from that observed in the data. © 1980 The American Physical Society.

Published
1980

47. Measurement of the Branching Fraction for the Cabibbo-Suppressed Decay τ-→K*-(892)ντ

Author

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

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

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

Published
1981

48. Observation of Semileptonic Decays of Charmed Baryons

Author

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

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

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

Published
1982

49. Measurement of γγψ Final States in ψ′ Decay

Author

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

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

The decay mode ψ′→γγψ has been studied with the Mark-II detector at SPEAR. New measurements of branching ratios for decays of the type ψ′→γχ, χ→γψ involving known χ states are presented. The existence of a χ state of mass near 3455 MeV/c2 produced in this decay chain is not confirmed, and the upper limit (90% confidence level) of the product of branching ratios is measured to be 0.13%. A new decay mode, ψ′→π0ψ, which violates isospin conservation is observed with branching ratio (0.15±0.06)%. © 1980 The American Physical Society.

Published
1980

50. Observation of Cabibbo-Suppressed Decay D0→π-π+ and D0→K-K+

Author

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

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

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

Published
1979

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