Author: "D. H. Stork" / Database: OpenAIRE - Searchworks@Jio Institute Digital Library Search Results

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104 results on '"D. H. Stork"'

1. Measurement of αs from b production at the cern p collider

Author: P. I. P. Kalmus, J. Dorenbosch, J. Gronberg, M. Vargas, Matthias Schröder, H. Faissner, B. Gonzalez, S. Lammel, E. Pietarinen, Daniel Denegri, H. Teykal, K. Ankoviak, R. Priem, David B. Cline, R. Prosi, Christopher Seez, D. Schinzel, M. P. J. Landon, G. Walzel, Carmen Albajar, H. Wagner, S. Tether, L. Fortson, Nicolas Ellis, A. Norton, E. Eisenhandler, K. Eggert, M. Markytan, H. Castilla-Valdez, S. Levegrün, J. P. Revol, W. von Schlippe, Ritva Kinnunen, Alain Givernaud, T.I. Meyer, L. Taylor, Jorma Tuominiemi, J. A. Caughlan, D. Samyn, S. Otwinowski, P. Sphicas, A. Moulin, I. R. Kenyon, Achim Geiser, Peter Lipa, P. Cennini, T.P. Shah, B. Buschbeck, G. Maurin, Andreas Morsch, W. van de Guchte, Y. Lemoigne, W. Jank, M. Della Negra, C.-E. Wulz, H. Evans, M. Rauschkolb, C. D. Buchanan, H. Tuchscherer, V. Vuillemin, Jean-Pierre Merlo, A. Bezaguet, Tejinder Virdee, S. Bartha, C. Rubbia, G. Bauer, D. H. Stork, C. Markou, Hans Reithler, J. Garvey, A. Gonidec, A. van Dijk, J. D. Dowell, I. F. Fensome, E. F. Clayton, K. Wacker, M. Mohammadi, G. Jorat, Sergio Cittolin, Manfred Krammer, C.H. Tan, Konstanty Sumorok, A. Placci, M. Pimiä, Dave Robinson, C. Daum, E. Radermacher, J. P. Porte, F. Szoncso, R. Schleichert, D. J. Holthuizen, K. Bos, M. Demoulin, Veikko Karimäki, D. Dau, Pierluigi Zotto, H. Dibon, G. Thompson, G. Pancheri, A. Böhrer, Steve McMahon, Anton Taurok, and T. Moers
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Hadron, law.invention, Renormalization, Factorization, law, Quantum mechanics, Strong coupling, Production (computer science), Collider
Abstract: The UA1 Collaboration has recently improved its measurement of the beauty production cross-section by including explicit measurements of b b correlations. Using these data we have determined the strong coupling constant α s . The comparison of the measured cross-section for 2-body final states with O ( α s 3 ) QCD predictions yields a measurement of α s (20 GeV) = 0.145 −0.010 exp −0.016 th +0.012 +0.013 , corresponding to α s ( M z ) = 0.113 −0.006 exp −0.009 th +0.007 +0.008 . This is the first theoretically well-defined measurement of α s from a purely hadronic production process. Evaluating α s from cross-sections at different Q 2 -values we find that the running of α s is needed for internal consistency of the UA1 data.
Published: 1996

2. Measurement of B0−0 mixing at the CERN Spp̄S collider

Author: K. Morgan, L. Dobrzynski, O. C. Allkofer, W. von Schlippe, G. Jorat, I. Zacharov, R. Priem, Emilio Petrolo, H. Bohn, H. Teykal, R. Prosi, M. Markytan, Jonathan M. Gregory, C.H. Tan, A. Geiser, E. Pietarinen, Daniel Denegri, D. J. Holthuizen, H. Castilla-Valdez, J. Colas, C.-E. Wulz, J. D. Dowell, H. Faissner, A. Bezaguet, S. Tether, S. Centro, R. Schleichert, Anna Teresa Meneguzzo, R. Conte, M. Passaseo, J.P. Vialle, A. Norton, F. Cavanna, G. Piano Mortari, Stefano Veneziano, A. Ferrando, C. Bacci, M. Demoulin, Jean-Pierre Merlo, J. Dorenbosch, T. Mller, Alessandro Bettini, Felicitas Pauss, Filippo Ceradini, S. Otwinowski, D. Schinzel, G. Bauer, R. Apsimon, R. Munoz, Carmen Albajar, Michael Albrow, H. Wagner, G. Thompson, B. Gonzalez, G. Pancheri, J. Gronberg, C. Markou, A. Morsch, G. Sajot, I. F. Fensome, M. Nikitas, Y. Zolnierowski, T. A. Fuess, P. Casoli, Alain Givernaud, K. Ankoviak, David B. Cline, G. Busetto, D. Drijard, Ritva Kinnunen, L. Taylor, C. Rubbia, F. J. Diez Hedo, X. Wu, S. Bartha, M. P. J. Landon, A. Di Ciaccio, H. Dibon, M. Felcini, C. D. Buchanan, B. Aubert, A. Moulin, M. A. Marquina, D. H. Stork, L. Fortson, V. Vuillemin, Jorma Tuominiemi, R. Martinelli, V. O'Dell, A. van Dijk, Christopher Seez, Steve McMahon, Anton Taurok, K. Wacker, T. Moers, E. Torrente-Lujan, J. P. Revol, K. Eggert, B. Buschbeck, D. Samyn, J. Garvey, J. P. Mendiburu, M. Yvert, D. Brockhausen, Veikko Karimäki, M. Mohammadi, Hans Reithler, E. Eisenhandler, Teresa Rodrigo, M W. Van de Guchte, P. I. P. Kalmus, M. Schrder, E. F. Clayton, K. Bos, Pierluigi Zotto, C. Daum, Manfred Krammer, W. Jank, J. P. Porte, G. Maurin, Aleandro Nisati, Konstanty Sumorok, M. Pimiä, P. Biddulph, I. Josa-Mutuberria, P. Nedelec, Sergio Cittolin, John A Coughlan, E. Radermacher, H. Evans, G. Ciapetti, M. Vargas, F. Szoncso, M. Rauschkolb, A. Caner, Nicolas Ellis, Dave Robinson, A. Placci, J. Salicio, I. R. Kenyon, Paraskevas Sphicas, M. Botlo, Peter Lipa, Ludovico Pontecorvo, D. Dau, M. Della Negra, Tejinder Virdee, Francesco Lacava, R. Bonino, S. A. Robins, J. Vrana, A. Bhrer, L. Zanello, T. C. Meyer, James Rohlf, P. Cennini, T. P. Shah, D. Kryn, S. Levegrn, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, D. Linglin, H. Tuchscherer, L. Naumann, and Y. Lemoigne
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Particle physics, Large Hadron Collider, law, High mass, Collider, computer, Mixing (physics), computer.programming_language, law.invention
Abstract: We report on a new measurement of B 0 − B 0 mixing at the CERN SppS collider. Mixing is measured in the non-isolated high mass dimoun sample using data from the 1988–1989 collider runs. The measured value of the mixing parameter, χ, is 0.145±0.035(stat.) ± 0.014(syst.). The average of this measurement and that from our 1984–1985 data is ξ= 0.14 ± 0.029 (stat.) ± 0.017 (syst.) assuming fully correlated errors. Using the measurement of ξd from ARGUS and CLEO , we obtain χ = 0.50 ± 0.20, which gives a limit of χs > 0.17 (0.12) at 90% (95%) CL. Including the measurements of χ from the ALEPH and L3 experiments gives χs = 0.53 ± 0.15, and a limit of χs > 0.27 (0.23) at 90% (95%) CL.
Published: 1991

3. Test of spin dependence in charm-quark fragmentation to D*

Author: K. A. Schwitkis, R. W. Stephens, Ronald R. Ross, W. Vernon, M. T. Ronan, B. C. Shen, W. A. Wenzel, T. K. Edberg, D. J. Lambert, M. Pripstein, W. T. Lin, Allan G Clark, J. S. Steinman, K. H. Fairfield, R. R. Kofler, M. L. Stevenson, A. Fridman, S. K. Park, Robert W. Kenney, T. Kamae, S. Khacheryan, A. P.T. Palounek, D. A. Crane, J. M. Hauptman, C. D. Buchanan, H. P. Paar, A. Bay, S. J. Yellin, N. A. Nicol, J. J. Eastman, G. D. Cowan, F. R. Rouse, H. Marsiske, G. Zapalac, A. Lu, Philippe Eberhard, S. J. Maxfield, Hiroaki Aihara, C. Ho, S. Toutounchi, Margaret Alston-Garnjost, Elliott D. Bloom, Y. T. Oyang, R. van Tyen, H. Y. Chao, C. Zeitlin, A. R. Barker, S. C. Loken, S. B. Chun, E. S. Miller, G. Lynch, J. G. Layter, R. E. Avery, H. Yamamoto, K. A. Derby, P. J. Oddone, B. D. Magnuson, Werner Hofmann, E. M. Wang, M. G. Strauss, H. Oh, J. Lys, R. J. Madaras, F.L. Linde, H. H. Bingham, J. C. Sens, D. R. Nygren, D. O. Caldwell, Tadayuki Takahashi, George P Yost, Orin I. Dahl, M. Daoudi, R. Belcinski, G. Masek, Y. X. Wang, D. H. Stork, Z. R. Wolf, Willem G. J. Langeveld, G. Shapiro, A. M. Eisner, D. E. Pellett, G. J. VanDalen, F. C. Erné, D. A. Bauer, G. Godfrey, M. K. Sullivan, J. R. Smith, L. G. Mathis, and IHEF (IoP, FNWI)
Subjects: Quark, Physics, Density matrix, Particle physics, Annihilation, Time projection chamber, Computer Science::Information Retrieval, Elementary particle, Fermion, Helicity, Charm quark, Nuclear physics, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, High Energy Physics::Experiment
Abstract: We have measured the polarization of {ital D}{sup *}, the energy dependence of the polarization, and the spin-density matrix of {ital D}{sup *} in {ital e}{sup +}{ital e{minus}} annihilation at a center-of-mass energy of 29 GeV using the Time Projection Chamber detector at the SLAC storage ring PEP. In 147 pb{sup {minus}1} of data we see no strong evidence for polarization, alignment, or final-state interactions in this fragmentation process.
Published: 1991

4. Intermittency studies in p collisions at

Author: R. Martinelli, Marta Felcini, E. Pietarinen, Ritva Kinnunen, I. F. Fensome, M. Pimiä, D. J. Holthuizen, B. Mours, F. J. Diez Hedo, Filippo Ceradini, T. A. Fuess, M. I. Josa, T. P. Shah, V. Vuillemin, Aleandro Nisati, G. Busetto, C. D. Buchanan, C. Albajar, M. Krammer, S. A. Robins, C. Bacci, Ludwik Dobrzynski, A. Norton, A. Gonidec, K. Eggert, G. Pancheri, L. Naumann, A. Ferrando, G. Cox, R. Bonino, A. Diciaccio, L. Zanello, E. Radermacher, J. P. Porte, G. Jorat, D. Schinzel, J. P. Mendiburu, C. Markou, P. Zotto, F. Pauss, Jonathan M. Gregory, X. Wu, M. Schröder, J. Garvey, M. Rauschkolb, A. Moulin, Achim Geiser, S. Otwinowski, A. van Dijk, T. S. Virdee, K. Ankoviak, Stefano Veneziano, P. I. P. Kalmus, Murrough Landon, P. Casoli, David B. Cline, A. Bettini, Th Muller, M. A. Marquina, Y. Lemoigne, A. Placci, M. Nikitas, J. Vrana, Jorma Tuominiemi, B. Buschbeck, H. Faissner, P. Biddulph, B. Aubert, K. Wacker, H. Dibon, M. Della Negra, D. Kryn, J. Dorenbosch, K. Morgan, R. Munoz, G. Salvini, L. Fortson, Y. Zolnierowski, P. Sphicas, H. Castilla-Valdez, James Rohlf, Daniel Denegri, P. Cennini, S. Levegrün, J. Gronberg, H. Bohn, D. Linglin, E. Eisenhandler, A. Givernaud, Peter Lipa, A. Meneguzzo, M. Demoulin, J. Colas, G. Sajot, D. Drijard, Stephan Lammel, R. Conte, Francesco Lacava, B. Gonzales, A. Böhrer, Steve McMahon, W. von Schlippe, H. Tuchscherer, Ludovico Pontecorvo, J. M. Salicio, Anton Taurok, Andreas Morsch, I. Zacharov, S. Cittolin, S. Tether, A. Caner, T. Rodrigo, L. Taylor, C.-E. Wulz, T. Moers, W. Jank, O. C. Allkofer, F. Cavanna, D. Samyn, M. Passaseo, J.P. Vialle, Hans Reithler, C. Stubenrauch, Dave Robinson, G. Piano Mortari, A. Bezaguet, F. Szoncso, P. Nedelec, Emilio Petrolo, E. F. Clayton, R. J. Apsimon, C. Daum, R. Prosi, B. Andrieu, W. van de Guchte, T. Meyer, S. Bartha, M. Botlo, S. Centro, M. Markytan, M. G. Albrow, E. Torrente-Lujan, Veikko Karimäki, J. D. Dowell, D. Dau, John A Coughlan, Vivian O'Dell, K. Bos, G. Thompson, Jean-Pierre Merlo, Nicolas Ellis, G. Bauer, D. H. Stork, M. Vargas, J. P. Revol, M. Yvert, Christopher Seez, H. Evans, G. Ciapetti, D. Brockhausen, C. Rubbia, M. Mohammadi, Konstanty Sumorok, G. Maurin, and I. Kenyon
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Detector, Monte Carlo method, Charged particle, law.invention, Nuclear physics, Azimuth, law, Intermittency, Pseudorapidity, Rapidity, Multiplicity (chemistry), Nuclear Experiment
Abstract: A significant intermittency signal is observed in 630 GeV p p collisions measured in the UA1 central detector. It occurs with similar magnitude in different variables: pseudorapidity, rapidity and azimuthal angle. The signal increases with decreasing charged particle multiplicity in the event. Its strength in a sample of low p⊥ tracks and its multiplicity dependence are not reproduced by commonly used Monte Carlo models of high energy interactions.
Published: 1990

5. Measurement of the total hadronic cross section in taggedγγreactions

Author: N. A. Nicol, Orin I. Dahl, F. R. Rouse, J. G. Layter, J. J. Eastman, R. Belcinski, S. Toutounchi, G. Masek, Robert W. Kenney, D. H. Stork, C. Ho, M. K. Sullivan, L. G. Mathis, C. Zeitlin, H. Aihara, Philippe Eberhard, A. R. Clark, S. J. Maxfield, R. E. Avery, M. G. Strauss, S. K. Park, T. Kamae, E. M. Wang, T. K. Edberg, S. C. Loken, William A. Wenzel, Z. R. Wolf, W. Vernon, M. Pripstein, Willem G. J. Langeveld, J. S. Steinman, K. A. Derby, M. T. Ronan, M. L. Stevenson, Werner Hofmann, P. J. Oddone, W. T. Lin, W. Wagner, D. A. Bauer, R. R. McNeil, George P Yost, Y. T. Oyang, D. E. Pellett, Tadayuki Takahashi, G. Godfrey, J. Lys, A. Fridman, M. Daoudi, R. R. Kofler, H. Yamamoto, B. D. Magnuson, H. Oh, D. R. Nygren, J. C. Sens, H. H. Bingham, Gilbert Shapiro, D. O. Caldwell, S. Khacheryan, S. J. Yellin, J. R. Smith, S. B. Chun, R. W. Stephens, G. Lynch, F. C. Erné, A. M. Eisner, Ronald R. Ross, K. H. Fairfield, H. P. Paar, G. J. VanDalen, J. M. Hauptman, C. D. Buchanan, K. A. Schwitkis, H. Marsiske, A. P.T. Palounek, G. D. Cowan, A. Bay, D. J. Lambert, G. Zapalac, Margaret Alston-Garnjost, R. van Tyen, A. R. Barker, H. Y. Chao, D. A. Crane, F.L. Linde, R. J. Madaras, B. C. Shen, A. Lu, Elliott D. Bloom, Y. X. Wang, and E. S. Miller
Subjects: Physics, Quantum chromodynamics, Nuclear physics, Particle physics, Photon, Scattering, Hadron, Elementary particle, Parton, Fermion, Energy (signal processing)
Abstract: We present a measurement of the total cross section for {gamma}{gamma}{r arrow}hadrons, with one photon quasireal and the other a spacelike photon of mass squared {minus}{ital Q}{sup 2}. Results are presented as a function of {ital Q}{sup 2} and the {gamma}{gamma} center-of-mass energy {ital W}, with the {ital Q}{sup 2} range extending from 0.2 to 60 GeV{sup 2}, and {ital W} in the range from 2 to 10 GeV. The data were taken with the TPC/Two-Gamma facility at the SLAC {ital e}{sup +}{ital e}{sup {minus}} storage ring PEP, which was operated at a beam energy of 14.5 GeV. The cross section exhibits a gentle falloff with increasing {ital W}. Its {ital Q}{sup 2} dependence is shown to be well described by an incoherent sum of vector-meson and pointlike scattering over most of the observed {ital W} range. Agreement at high {ital Q}{sup 2} is improved if a minimum-{ital p}{sub {ital T}} cutoff (motivated by QCD) is imposed on the pointlike contribution.
Published: 1990

6. Experimental limit on the decay W±→π±γ at the cern proton-antiproton collider

Author: M. Vargas, J. Salicio, J. Dorenbosch, J. Gronberg, Carmen Albajar, Jean-Pierre Merlo, G. Bauer, R. Martinelli, C. Rubbia, D. H. Stork, D. Linglin, W. von Schlippe, E. Pietarinen, Daniel Denegri, C. Bacci, Tejinder Virdee, K. Bos, Anna Teresa Meneguzzo, T.I. Meyer, Ritva Kinnunen, A. Ferrando, H. Tuchscherer, A. Diciaccio, M. Yvert, Francesco Lacava, Sergio Cittolin, Alain Givernaud, P. Sphicas, D. Samyn, D. Schinzel, B. Mours, S. A. Robins, J. Vrana, Teresa Rodrigo, J. Colas, F. J. Diez Hedo, G. Busetto, X. Wu, R. J. Apsimon, P. I. P. Kalmus, Steve McMahon, B. Gonzales, Anton Taurok, Christopher Seez, A. Bezaguet, Michael Albrow, E. Torrente-Lujan, F. Szoncso, L. Zanello, T. Moers, S. Tether, J. P. Revol, M. Felcini, B. Andrieu, L. Dobrzynski, L. Naumann, F. Cavanna, C. Markou, K. Eggert, Alessandro Bettini, G. Thompson, Jorma Tuominiemi, V. O'Dell, A. Morsch, G.F. Cox, H. Castilla-Valdez, P. Biddulph, M. Passaseo, J.P. Vialle, G. Piano Mortari, H. Evans, D. Brockhausen, G. Ciapetti, P. Casoli, A. van Dijk, G. Jorat, Jonathan M. Gregory, M. Nikitas, D. Drijard, I. Zacharov, H. Dibon, Emilio Petrolo, S. Bartha, M. A. Marquina, Y. Lemoigne, H. Faissner, G. Sajot, I. F. Fensome, K. Ankoviak, P. Nedelec, Veikko Karimäki, P. Cennini, David B. Cline, G. Pancheri, J. P. Mendiburu, Aleandro Nisati, R. Munoz, R. Prosi, A. Böhrer, Pierluigi Zotto, A. Norton, E. Eisenhandler, M. P. J. Landon, Nicolas Ellis, M. Mohammadi, M. Markytan, L. Fortson, L. Taylor, C. Daum, A. Geiser, Peter Lipa, O. C. Allkofer, Matthias Schröder, Hans Reithler, H. Bohn, D. Kryn, Stefano Veneziano, A. Moulin, Y. Zolnierowski, Felicitas Pauss, Filippo Ceradini, M. Botlo, Claudia J. Stubenrauch, S. Lammel, C.-E. Wulz, T. A. Fuess, E. F. Clayton, R. Conte, G. Maurin, S. Otwinowski, A. Placci, W. van de Guchte, K. Wacker, B. Buschbeck, E. Radermacher, J. P. Porte, J. Garvey, James Rohlf, J. D. Dowell, Th. Müller, John A Coughlan, W. Jank, C. D. Buchanan, T. P. Shah, Manfred Krammer, Ludovico Pontecorvo, V. Vuillemin, Konstanty Sumorok, M. Pimiä, K. Morgan, D. Dau, M. Della Negra, Maria Isabel Josa, M. Rauschkolb, R. Bonino, B. Aubert, D. J. Holthuizen, S. Centro, M. Demoulin, S. Levegrün, I. R. Kenyon, A. Gonidec, Dave Robinson, and A. Caner
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Large Hadron Collider, Proton, 010308 nuclear & particles physics, Detector, 01 natural sciences, law.invention, Nuclear physics, law, Antiproton, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Limit (mathematics), 010306 general physics, Collider
Abstract: We present a search for the decay W±→π±γ, using data taken at the CERN proton-antiproton Collider with the UA1 detector and corresponding to an integrated luminosity of 0.7 pb−1. We do not observe a signal for such a process: hence we obtain an upper limit on the π±γ decay width of 5.8×10−2Γ (W±→e±v) (95%CL).
Published: 1990

7. Search for new heavy quarks in proton-antiproton collisions at $$\sqrt s = 0.63 TeV$$

Author: A. Caner, G. Maurin, S. Bartha, Nicolas Ellis, W. van de Guchte, M. Botlo, Peter Lipa, Aleandro Nisati, Christopher Seez, Anna Teresa Meneguzzo, Y. Zolnierowski, Felicitas Pauss, Filippo Ceradini, W. von Schlippe, T. A. Fuess, D. Denegri, V. Vuillemin, A. Ferrando, M. Yvert, T.I. Meyer, J. Dorenbosch, Alain Givernaud, P. Sphicas, L. Taylor, H. Tuchscherer, K. Eggert, D. Samyn, M. Rauschkolb, F. J. Diez Hedo, M. A. Marquina, D. Kryn, D. Brockhausen, Jorma Tuominiemi, G. Busetto, J. Garvey, J. D. Dowell, M. Lindgren, M. Jimack, E. Pietarinen, Carmen Albajar, I. R. Kenyon, Vivian O'Dell, J. Gronberg, C. Bacci, J. P. Vialle, A. Bezaguet, Ludovico Pontecorvo, B. Andrieu, Stefano Veneziano, J. Colas, M. Degiorgi, H. Bohn, G. Sajot, S. A. Robins, S. Tether, J. Salicio, L. Dobrzynski, P. Erhard, Marta Felcini, C. Daum, J. P. Merlo, David Robinson, D. Schinzel, M. Della Negra, John A Coughlan, Maria Isabel Josa, B. Aubert, P. Nedelec, H. Castilla-Valdez, Barbara Alvarez Gonzalez, A. van Dijk, R. Leuchs, L. Zanello, A. Moulin, A. Norton, T. P. Shah, E. Eisenhandler, C.-E. Wulz, E. Tscheslog, J. P. Revol, L. Naumann, A. Gonidec, Andreas Morsch, G. Ciapetti, M. Vargas, R. Conte, E. Rademacher, Claudia J. Stubenrauch, Hal Evans, C. D. Buchanan, Achim Geiser, R. Martinelli, S. Lammel, K. Morgan, F. Cavanna, P. Cennini, Manfred Krammer, Y. Lemoigne, Sergio Cittolin, Konstanty Sumorok, S. Otwinowski, G. Piano Mortari, Hans Reithler, M. P. J. Landon, D. J. Holthuizen, B. Buschbeck, E. F. Clayton, L. Fortson, Emilio Petrolo, Ritva Kinnunen, A. Placci, M. Pimiä, S. Beingessner, James Rohlf, S. Centro, J. Kroll, J. P. Porte, Th. Müller, M. Demoulin, P. I. P. Kalmus, W. Jank, M. Markytan, D. Cline, C. Rubbia, Tejinder Virdee, G. Bauer, Francesco Lacava, D. H. Stork, R. Munoz, F. Szoncso, E. Torrente-Lujan, P. Biddulph, G. Walzel, J. P. Mendiburu, J. Vrana, K. Ankoviak, Alessandro Bettini, G. Thompson, S. Levegrün, D. Linglin, G.F. Cox, P. Casoli, H. Dibon, Veikko Karimäki, K. Bos, G. Pancheri, D. Dau, A. Böhrer, I. F. Fensome, Pierluigi Zotto, H. Faissner, M. Mohammadi, M. Nikitas, D. Drijard, K. Wacker, R. J. Apsimon, T. Rodrigo, Michael Albrow, O. C. Allkofer, Matthias Schröder, Xin Wu, I. Zacharov, R. Bonino, M. Passaseo, R. Prosi, Steve McMahon, Anton Taurok, T. Moers, C. Markou, A. Diciaccio, G. Jorat, and Jonathan M. Gregory
Subjects: Physics, Quark, Particle physics, Large Hadron Collider, Muon, Physics and Astronomy (miscellaneous), Proton, High Energy Physics::Lattice, High Energy Physics::Phenomenology, law.invention, Standard Model, Nuclear physics, law, Antiproton, High Energy Physics::Experiment, Collider, Engineering (miscellaneous), Particle Physics - Experiment, Bar (unit)
Abstract: We report on a search for new heavy quarks decaying semileptonically into muons, using 4.7 pb−1 of data taken during the CERN$p\bar p$ collider runs in 1988 and 1989. The properties of isolated muons accompanied by jets are consistent with the predictions from the Standard Model but do not show a signal for a new heavy quark. Combining all the UA1 data (5.4 pb−1), lower mass limits are obtained at 60 GeV/c2 (95% CL) for thet-quark and 43 GeV/c2 (95% CL) for a fourth-generation charge-1/3 quark (b′-quark).
Published: 1990

8. First observation of the beauty baryon Λb in the decay channel Λb→J/ψΛ at the CERN proton-antiproton collider

Author: Veikko Karimäki, Emilio Petrolo, E. Pietarinen, Daniel Denegri, H. Teykal, Jean-Pierre Merlo, Felicitas Pauss, M. Rauschkolb, R. Prosi, Pierluigi Zotto, Filippo Ceradini, A. Diciaccio, C. Demoulin, T. A. Fuess, C. Rubbia, J. Dorenbosch, A. Caner, M. Markytan, A. Bezaguet, J M. Salicio, B. Gonzalez, L. Taylor, H. Faissner, J. Gronberg, S. Levegrün, D. H. Stork, X. Wu, D. J. Holthuizen, P. Cennini, S. Otwinowski, Tejinder Virdee, Stefano Veneziano, M. Yvert, R. Priem, W. von Schlippe, P. Nedelec, Francesco Lacava, H. Dibon, A. Moulin, C. Markou, R. Martinelli, G. Sajot, I. F. Fensome, H. Bohn, Sergio Cittolin, Peter Lipa, S. Tether, D. Schinzel, A. Ferrando, D. Schleichert, E. Torrente-Lujan, J. P. Revol, Carmen Albajar, Aleandro Nisati, M. Passaseo, S. Centro, Jorma Tuominiemi, Nicolas Ellis, Alessandro Bettini, F. Szoncso, M.I. Josa, K. Wacker, Christopher Seez, J.P. Vialle, D. Samyn, Ludovico Pontecorvo, C. Daum, G. Pancheri, M. Mohammadi, A. Böhrer, C.-E. Wulz, J. Colas, G. Thompson, A. Morsch, D. Kryn, V. O'Dell, K. Eggert, D. Dau, M. Della Negra, Manfred Krammer, O. C. Allkofer, H. Evans, G. Ciapetti, R. Conte, D. Brockhausen, A. van Dijk, Steve McMahon, P. Casoli, G. Busetto, Konstanty Sumorok, Anton Taurok, Alain Givernaud, E. Eisenhandler, J. Garvey, Paraskevas Sphicas, T. Moers, I. Zacharov, K. Morgan, M. Vargas, I. R. Kenyon, A. Norton, F. Cavanna, L. Naumann, M. Botlo, M. Nikitas, D. Drijard, F. J. Diez Hedo, G. Piano Mortari, G. Bauer, M. Felcini, Teresa Rodrigo, A. Geiser, P. I. P. Kalmus, G. Maurin, S. Bartha, W. van de Guchte, P. Biddulph, M. Pimiä, M. A. Marquina, C. Bacci, K. Bos, R. Bonino, Y. Lemoigne, Th. Müller, W. Jank, Matthias Schröder, K. Ankoviak, Ritva Kinnunen, A. Bushbeck, L. Dobrzynski, David B. Cline, D. Linglin, T. C. Meyer, M. P. J. Landon, John A Coughlan, H. Tuchscherer, L. Fortson, James Rohlf, E. Radermacher, G. Jorat, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, Jonathan M. Gregory, C.H. Tan, R. Apsimon, R. Munoz, Michael Albrow, H. Wagner, Dave Robinson, A. Placci, J. Vrana, L. Zanello, B. Aubert, Hans Reithler, E. F. Clayton, J. P. Porte, Y. Zolnierowski, C. D. Buchanan, T. P. Shah, V. Vuillemin, H. Castilla-Valdez, J. D. Dowell, J. P. Mendiburu, and Anna Teresa Meneguzzo
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, Proton, 010308 nuclear & particles physics, Branching fraction, 01 natural sciences, law.invention, Baryon, Nuclear physics, law, Antiproton, 0103 physical sciences, 010306 general physics, Collider, Event (particle physics)
Abstract: We report on the first observation of the beauty baryon Λb in an exclusive decay channel at the CERN p p collider. Using 4.7 pb−1 of muon data collected in the 1988/89 collider runs we reconstruct 16±5 Λb's in the decay mode Λ b → J ψΛ above a background of 9±1 events, corresponding to a significance of about five standard deviations. We measure the Λb mass to be mΛb=5640±50±30 MeV/c2. Using the beauty cross-section measured by UA1 we deduce for the product of the production fraction and branching ratio f Λ b Br (Λ b → J ψΛ )=(1.8±1.0)×10 -10 . Our sample contains three-muon event in which the beauty particle opposite to the Λ b is tagged by the third muon. We also observe an indication of a signal in the decay channel B 0 → J ψ K 0∗ with a significance of three standard deviations.
Published: 1991

9. BEAUTY PRODUCTION AT THE CERN PP-BAR COLLIDER

Author: K. Morgan, Sergio Cittolin, S. Otwinowski, M. Nikitas, D. Drijard, P. Biddulph, S. Bartha, M. A. Marquina, F. Szoncso, Steve McMahon, P. Cennini, Anton Taurok, T. Moers, B. Gonzalez, Michael Albrow, Teresa Rodrigo, R. J. Apsimon, M. Felcini, H. Wagner, W. von Schlippe, P. I. P. Kalmus, J. Colas, J. M. Silicio, R. Priem, D. Kryn, C. Markou, E. Eisenhandler, A. Bezaguet, C. Dau, M. Rauschkolb, Murrough Landon, Anna Teresa Meneguzzo, J. Dorenbosch, K. Bos, H. Faissner, H. Dibon, H. Castilla-Valdez, R. Martinelli, A. Ferrando, A. Caner, J. Gronberg, L. Dobrzynski, Aleandro Nisati, D. Linglin, J. D. Dowell, R. Munoz, Tejinder Virdee, Jean-Pierre Merlo, Francesco Lacava, R. Bonino, A. Norton, G. Jorat, F. Cavanna, Jonathan M. Gregory, C.H. Tan, H. Tuchscherer, A. Böhrer, K. Ankoviak, David B. Cline, G. Piano Mortari, E. Torrente-Lujan, Carmen Albajar, C. Rubbia, X. Wu, G. Sajot, Emilio Petrolo, R. Schleichert, J. P. Revol, P. Nedelec, G. Pancheri, H. Teykal, D. Samyn, Felicitas Pauss, Filippo Ceradini, I. F. Fensome, L. Naumann, C. Daum, R. Prosi, T. A. Fuess, J. P. Mendiburu, Y. Zolnierowski, C. Bacci, T. Meyer, M. Markytan, D. H. Stork, I. R. Kenyon, L. Fortson, Paraskevas Sphicas, M. Botlo, S. A. Robins, G. Bauer, Y. Lemoigne, J. Vrana, Jorma Tuominiemi, Nicolas Ellis, K. Wacker, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, C. D. Buchanan, Peter Lipa, M. Vargas, H. Bohn, Stefano Veneziano, M. Mohammadi, L. Zanello, T. P. Shah, V. Vuillemin, Manfred Krammer, Konstanty Sumorok, A. Moulin, J. Garvey, Pierluigi Zotto, Alain Givernaud, Ritva Kinnunen, Ludovico Pontecorvo, L. Taylor, E. Pietarinen, Daniel Denegri, C.-E. Wulz, B. Buschbeck, James Rohlf, Alessandro Bettini, G. Thompson, R. Conte, M. Della Negra, Hans Reithler, F. J. Diez Hedo, Maria Isabel Josa, Th. Müller, A. Diciaccio, A. Morsch, E. F. Clayton, W. Jank, P. Casoli, G. Busetto, M. Yvert, S. Levegrün, G. Maurin, W. van de Guchte, M. Pimiä, H. Evans, V. O'Dell, A. van Dijk, Dave Robinson, A. Placci, John A Coughlan, E. Radermacher, O. C. Allkofer, I. Zacharov, Christopher Seez, V. Karimäki, D. Schinzel, K. Eggert, D. Brockhausen, A. Geiser, S. Tether, M. Passaseo, J.P. Vialle, Matthias Schröder, G. Ciapetti, J. P. Porte, D. J. Holthuizen, B. Aubert, S. Centro, and M. Demoulin
Subjects: Quantum chromodynamics, Quark, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Large Hadron Collider, Muon, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Hadron, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Collider
Abstract: We report measurements of b-quark and B-hadron production in pp collisions at √s=630 GeV. We use muon samples to extract beauty production cross-sections over a wide range of transverse momentum in the central rapidity range |y| < 1.5. We compare our results to an O(αs3) QCD prediction and find good agreement over the measured b-quark transverse momentum range 6 GeV/c to 54 GeV/c. Using the shape of the pT and y distribution predicted by QCD to extrapolate our data, we infer a total cross-section for b-quark production at √s=630 GeV of σ(pp→bb+X)=19.3±7(exp.)±9(th.μb.
Published: 1991

10. Performance of a uranium/tetramethylpentane calorimeter backed by an iron/scintillator calorimeter

Author: J. Gronberg, Stanislas Otwinowski, Q. H. Tan, P. Cennini, C. D. Buchanan, Filippo Ceradini, E. Torrente-Lujan, L. Casoli, Guy Maurin, T. A. Fuess, L. Naumann, Alfredo Placci, L. Dumps, Hedo F. J. Diez, D. Bloess, Pierluigi Zotto, Giorgi M. De, W.F. Schmidt, G. Busetto, Carlo Rubbia, C. Bacci, A. Bezaguet, K. Morgan, R. Munoz, H. Castilla-Valdez, S. Tether, Alain Givernaud, X. Wu, Emilio Petrolo, R. J. Apsimon, A. Gonidec, H. Teykal, M. Dellanegra, V. Vuillemin, Tejinder Virdee, Francesco Lacava, Anna Teresa Meneguzzo, De Guchte M. W. Van, Christopher Seez, T. Rodrigo, Dave Robinson, L. Pontecorvo, Claudia J. Stubenrauch, A. Ferrando, H. Evans, R. Martinelli, E. Radermacher, D. Schinzel, O. Ullaland, A. Caner, F. Cavanna, M. Mohammadi, W. Kienzle, I. Josa-Mutuberria, Jean Pierre Charles Revol, Stefano Veneziano, Mortari G. Piano, P. Nedelec, D. Marchand, D. Drijard, Anna Di Ciaccio, S. Centro, Manfred Krammer, Konstanty Sumorok, M. Lindgren, G. Walzel, J. M. Bodenes, R. Conte, R. Bonino, I. Wingerter-Seez, W. Seidl, G. Bauer, and D. H. Stork
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Muon, Calorimeter (particle physics), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Hadron, chemistry.chemical_element, Electron, Uranium, 01 natural sciences, 7. Clean energy, Nuclear physics, Pion, chemistry, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Instrumentation, Noise (radio)
Abstract: We present results from the barrel depleted uranium/TMP calorimeter modules constructed by the UA1 Collaboration. Electromagnetic and hadronic energy resolutions have been measured using electron and pion beams with momenta in the range 7 to 70 GeV/c. Results on the energy linearity and the spatial uniformity of response are reported. The electromagnetic shower position resolution has been measured as a function of energy using a fine grained position detector placed at a depth of − 3.5small chi, Greek0. The noise arising both from the electronics chain and from the uranium radioactivity is compared with 70 GeV/c muon signals. The ratio of the electron to pion response has been measured both as a function of the energy and of the electric field. The high lateral and longitudinal granularity of the calorimeter and the presence of a position detector have been used to determine the electron pion separation as a function of energy.
Published: 1991

11. Measurement of the ratio R≡σWBr(W→μν)/σzBr(Z→μμ) and ΓWtot at the CERN proton-antiproton collider

Author: Christopher Seez, K. Eggert, D. Brockhausen, H. Faissner, Carmen Albajar, R. Priem, P. Nedelec, G. Pancheri, Anna Teresa Meneguzzo, E. Pietarinen, Daniel Denegri, Jean-Pierre Merlo, A. Ferrando, A. Diciaccio, Nicolas Ellis, C. D. Buchanan, T. P. Shah, V. Vuillemin, C. Rubbia, R. Schleichert, L. Taylor, D. Daum, Tejinder Virdee, X. Wu, M. Felcini, R. Apsimon, R. Munoz, Francesco Lacava, I. R. Kenyon, D. Linglin, Claudia J. Stubenrauch, Jorma Tuominiemi, D. H. Stork, A. Gonidec, Aleandro Nisati, A. Moulin, V. O'Dell, Hans Reithler, E. F. Clayton, Alain Givernaud, A. van Dijk, K. Bos, C. Bacci, L. Dobrzynski, Veikko Karimäki, J. P. Mendiburu, G. Maurin, F. J. Diez Hedo, J. P. Porte, H. Tuchscherer, W. van de Guchte, M. Pimiä, Steve McMahon, Anton Taurok, T. Moers, A. Caner, G. Busetto, S. Bartha, Y. Zolnierowski, Felicitas Pauss, M. Vargas, Filippo Ceradini, G. Bauer, R. Martinelli, Teresa Rodrigo, P. I. P. Kalmus, G. Jorat, M. A. Marquina, A. Bezaguet, T. A. Fuess, H. Castilla-Valdez, Jonathan M. Gregory, C.H. Tan, Stephan Lammel, Ritva Kinnunen, J. D. Dowell, W. von Schlippe, J. Dorenbosch, Dave Robinson, John A Coughlan, E. Radermacher, A. Placci, M. Yvert, Pierluigi Zotto, B. Gonzalez, J. Garvey, D. Samyn, B. Aubert, J. Gronberg, J. Salicio, L. Naumann, D. J. Holthuizen, H. Evans, G. Ciapetti, Michael Albrow, Sergio Cittolin, D. Schinzel, H. Wagner, Alessandro Bettini, E. Eisenhandler, S. Otwinowski, G. Thompson, Y. Lemoigne, C. Markou, S. Centro, F. Szoncso, A. Morsch, M. Demoulin, P. Casoli, Paraskevas Sphicas, M. Botlo, E. Torrente-Lujan, J. P. Revol, S. Tether, M. Passaseo, J.P. Vialle, O. C. Allkofer, I. Zacharov, R. Bonino, James Rohlf, A. Geiser, T. C. Meyer, Matthias Schröder, Peter Lipa, Ludovico Pontecorvo, D. Dau, M. Della Negra, Maria Isabel Josa, S. Levegrün, H. Dibon, A. Böhrer, J. Colas, A. Norton, F. Cavanna, M. Nikitas, D. Drijard, G. Piano Mortari, K. Morgan, Stefano Veneziano, Emilio Petrolo, H. Teykal, R. Prosi, H. Bohn, M. Markytan, M. Rauschkolb, C.-E. Wulz, K. Wacker, M. Mohammadi, Manfred Krammer, Konstanty Sumorok, R. Conte, K. Ankoviak, David B. Cline, M. P. J. Landon, P. Biddulph, L. Fortson, P. Cennini, B. Buschbeck, Th. Müller, W. Jank, S. A. Robins, J. Vrana, L. Zanello, G. Sajot, and I. F. Fensome
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Proton, 010308 nuclear & particles physics, Electron, 01 natural sciences, law.invention, Standard Model, Nuclear physics, law, Antiproton, 0103 physical sciences, 010306 general physics, Collider
Abstract: An analysis of W and Z boson production at UA1, using 4.66 pb −1 of data from the 1988 and 1989 CERN p p Collider runs at s =0.63 TeV , yields R ≡ σ W Br(W→ μ v)/ σ z Br( Z → μμ )=10.4 −1.5 +1.8 stat.±0.8(syst.) We find R =9.5 −1.0 +1.1 (stat.+syst.) when combining all available UA1 data, in both the electron and muon channel, taken in the period 1983–1989. In the framework of the standard model, the value of R is used to infer the total width of the W boson, Γ W tot =2.18 −0.24 +0.26 (exp.)±0.04(theory) GeV/ c 2 .
Published: 1991

12. Limits On T-quark Decay Into Charged Higgs From A Direct Search At the Cern Ppbar Collider

Author: A. Ferrando, G. Maurin, S. Mcmahon, L. Pontecorvo, John A Coughlan, C. Seez, M. Della Negra, R. Conte, Hans Reithler, Daniel Denegri, H. Faissner, P. Lipa, K. Bos, F. Pauss, J. P. Porte, T A. Fuess, K M. Ankoviak, M. Nikitas, A. Caner, M. Pimia, V. Vuillemin, M W. Van de Guchte, Carmen Albajar, D. Linglin, D. Samyn, G. Busetto, R. Prosi, J. Salicio, D. Schinzel, M. Yvert, L. Dobrzynski, S. Lammel, E. Radermacher, Barbara Alvarez Gonzalez, I. Josa-Mutuberria, E. Pietarinen, Tejinder Virdee, K. Eggert, Francesco Lacava, A. Meneguzzo, G. Bauer, R. Bonino, M. Vargas, Y. Zolnierowski, Filippo Ceradini, D. Dau, T. Mller, F. Szoncso, P. Nedelec, J P. Merlo, J. Rohlf, P I P. Kalmus, R. Martinelli, H. Tuchscherer, A. Givernaud, M. Landon, I F. Fensome, Anton Taurok, K. Morgan, M. Mohammadi, S. Centro, P. Sphicas, G. Sajot, G. Pancheri, T. Moers, L. Naumann, I. Zacharov, W. Jank, H. Castilla-Valdez, G. Thompson, D. Cline, Ritva Kinnunen, D. Brockhausen, M. Demoulin, J D. Dowell, E. Eisenhandler, P. Biddulph, T. Meyer, C. Rubbia, C. D. Buchanan, A. Norton, H. Dibon, M. Schrder, T.P. Shah, Michael Albrow, M. Krammer, D J. Holthuizen, S. Levegrn, C E. Wulz, Claudia J. Stubenrauch, J. Dorenbosch, J P. Revol, H. Bohn, S. Cittolin, Marta Felcini, B. Buschbeck, J.P. Vialle, H F. Teykal, A. Di Ciaccio, F. Cavanna, J. Gronberg, M. Botlo, P. Cennini, R. Schleichert, I R. Kenyon, W. Von Schlippe, P. Casoli, A.A. van Dijk, Dave Robinson, A. Bhrer, G. Piano Mortari, S A. Robins, J. P. Mendiburu, Emilio Petrolo, V R. O'Dell, E. Torrente-Lujan, A. Placci, Pierluigi Zotto, B. Aubert, M. Markytan, Stefano Veneziano, C. Daum, Xin Wu, E. Clayton, K. Wacker, Y. Lemoigne, S. Bartha, R. Munoz, S. Tether, J. Colas, A. Bettini, R. Priem, G. Ciapetti, A. Bezaguet, A. Nisati, Nicolas Ellis, D. Kryn, A. Morsch, F. J. Diez Hedo, V. Karimaki, R J. Apsimon, M A. Marquina, K. Sumorok, T. Rodrigo, O. C. Allkofer, L. Fortson, A. Gonidec, M. Rauschkolb, D. Drijard, C. Bacci, D H. Stork, J. Garvey, L. Taylor, M. Passaseo, J. Tuominiemi, A. Geiser, C. Markou, G. Jorat, Jonathan M. Gregory, C.H. Tan, A. Moulin, S. Otwinowski, H. Wagner, J. Vrana, L. Zanello, and H. G. Evans
Subjects: Physics, Nuclear and High Energy Physics, Top quark, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, 01 natural sciences, UA1 experiment, Higgs sector, law.invention, Nuclear physics, law, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, Direct search, 010306 general physics, Collider, Boson
Abstract: A search for t-quark decay into charged Higgs, t→H + b, with the charged Higgs decaying via the H + → τ + v τ mode, has been done in proton-antiproton collisions at √2 = 0.63 TeV with the UA1 experiment. No evidence for this decay das been observed. Mass limits at 95% and 90% CL for the t-quark and the charged Higgs are presented. The results have also been interpreted in terms of the tan β parameter of a two-doublet Higgs sector.
Published: 1991

13. A SEARCH FOR RARE B-MESON DECAYS AT THE CERN SPPBARS COLLIDER

Author: J. Dorenbosch, W. von Schlippe, S. Bartha, M. A. Marquina, J. Garvey, J. Gronberg, M. Vargas, Michael Albrow, E. Eisenhandler, Tejinder Virdee, M. Felcini, Francesco Lacava, H. Wagner, H. Bohn, B. Aubert, O. C. Allkofer, I. Zacharov, D. Schinzel, M. Rauschkolb, G. Sajot, Alain Givernaud, A. Geiser, C.-E. Wulz, I. F. Fensome, R. Conte, F. J. Diez Hedo, C. Markou, James Rohlf, H. Faissner, D. Samyn, C. Daum, Steve McMahon, Anton Taurok, T. Moers, Carmen Albajar, Paraskevas Sphicas, M. Botlo, G. Pancheri, J. P. Mendiburu, E. Torrente-Lujan, J. P. Revol, D. Linglin, Murrough Landon, Anna Teresa Meneguzzo, Teresa Rodrigo, Christopher Seez, K. Ankoviak, H. Tuchscherer, David B. Cline, P. I. P. Kalmus, M. Schrder, S. Otwinowski, Aleandro Nisati, L. Fortson, K. Bos, K. Eggert, D. Brockhausen, A. Caner, S. Tether, Felicitas Pauss, Filippo Ceradini, M. Passaseo, J.P. Vialle, T. A. Fuess, Hans Reithler, E. F. Clayton, P. Nedelec, X. Wu, K. Wacker, M. Mohammadi, G. Maurin, J. P. Porte, Jorma Tuominiemi, Sergio Cittolin, M. Nikitas, D. Drijard, Manfred Krammer, M. Pimiä, Konstanty Sumorok, L. Naumann, K. Morgan, Y. Zolnierowski, E. Pietarinen, Daniel Denegri, Nicolas Ellis, C. D. Buchanan, T. P. Shah, I. R. Kenyon, V. Vuillemin, F. Szoncso, L. Dobrzynski, Y. Lemoigne, G. Jorat, Jonathan M. Gregory, C.H. Tan, John A Coughlan, R. Priem, E. Radermacher, H. Castilla-Valdez, J. D. Dowell, A. Bezaguet, J. Colas, R. Schleichert, H. Dibon, M. Yvert, R. Martinelli, A. Moulin, V. O'Dell, M W. Van de Guchte, Dave Robinson, A. Ferrando, A. Placci, J M. Salicio, A. van Dijk, I. Josa-Mutuberria, H. Evans, G. Ciapetti, Jean-Pierre Merlo, C. Bacci, C. Rubbia, D. H. Stork, A. Norton, F. Cavanna, T. Mller, B. Buschbeck, G. Piano Mortari, W. Jank, L. Taylor, G. Busetto, P. Cennini, G. Bauer, S. A. Robins, Ritva Kinnunen, B. Gonzalez, D. Kryn, J. Vrana, R. J. Apsimon, A. Bhrer, L. Zanello, P. Biddulph, Emilio Petrolo, Alessandro Bettini, S. Levegrn, Claudia J. Stubenrauch, S. Lammel, G. Thompson, H. Teykal, A. Gonidec, A. Morsch, P. Casoli, R. Prosi, M. Markytan, Veikko Karimäki, Pierluigi Zotto, A. Di Ciaccio, R. Munoz, R. Bonino, T. C. Meyer, D. J. Holthuizen, S. Centro, M. Demoulin, Peter Lipa, Ludovico Pontecorvo, D. Dau, M. Della Negra, and Stefano Veneziano
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, law, 0103 physical sciences, B meson, 010306 general physics, Collider, 01 natural sciences, law.invention
Abstract: We report on a search for the decays B 0 → μ + μ − , B → μ + μ − X and B d 0 → μ + μ − K 0∗ , which are expected to be rare if mediated by flavor changing neutral currents. Using data collected during the 1984–1989 CERN pp Collider runs, the UA1 search was carried out using μ+ μ− events with 3.9 B 0 d →μ + μ − K 0∗ of of 2.3 × 10−5. Implicatitions for upper limits on the t-quark mass are discussed.
Published: 1991

14. J/ψ and ψ′ production at the CERN p̄p collider

Author: J D. Dowell, G. Maurin, W. van de Guchte, M. Pimiä, Aleandro Nisati, Jean-Pierre Merlo, P. Prosi, James Rohlf, G. Bauer, Felicitas Pauss, Filippo Ceradini, J. Dorenbosch, T. A. Fuess, D. Samyn, J. Gronberg, H. Dibon, D. Schinzel, Paraskevas Sphicas, M. Rauschkolb, M. Botlo, H. Bohn, Christopher Seez, John A Coughlan, J. Colas, Steve McMahon, R. Martinelli, W. von Schlippe, Veikko Karimäki, E. Radermacher, Anton Taurok, K. Eggert, L. Taylor, Tejinder Virdee, Francesco Lacava, D. Brockhausen, C. Rubbia, Ritva Kinnunen, T. Moers, K. Bos, P. Nedelec, Murrough Landon, A. Caner, Anna Teresa Meneguzzo, Teresa Rodrigo, H. Castilla-Valdez, A. Böhrer, P. I. P. Kalmus, I.F. Fensome, D. J. Holthuizen, D. H. Stork, A. Norton, F. Cavanna, P. Cennini, A. Bezaguet, Pierluigi Zotto, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, C. Markou, O. C. Allkofer, K. Morgan, G. Sajot, A. Ferrando, Alain Givernaud, J. Salicio, S. Levegrün, G. Piano Mortari, R. Schleichert, S. Centro, I. Zacharov, F. J. Diez Hedo, J.M. Gregory, E. Eisenhandler, Emilio Petrolo, Alessandro Bettini, G. Thompson, Sergio Cittolin, B. Aubert, H. Teykal, M. Demoulin, M. Vargas, C.-E. Wulz, V. O'Dell, A. van Dijk, A. Morsch, C. Bacci, P. Casoli, G. Busetto, L. Dobrzynzki, D. Daum, R. Bonino, F. Szoncso, J. Vrana, A. Gonzales, R. Conte, S. Bartha, D. Kryn, M. A. Marquina, M. Markytan, T. C. Meyer, S. Otwinowski, G. Jorat, C.H. Tan, Hans Reithler, E. F. Clayton, Stefano Veneziano, D. Drijard, J. Garvey, M. Yvert, I. Kenyon, Peter Lipa, A. Geiser, E. Torrente-Lujan, J. P. Revol, Ludovico Pontecorvo, D. Dau, M. Della Negra, Maria Isabel Josa, J. P. Porte, P. Biddulph, H. Evans, G. Ciapetti, Y. Zolnierowski, L. Forston, K. Wacker, S. Tether, M. Mohammadi, Manfred Krammer, C. D. Buchanan, T. P. Shah, Konstanty Sumorok, K. Ankoviak, David B. Cline, M. Passaseo, V. Vuillemin, J.P. Vialle, N. Ellis, Matthias Schröder, X. Wu, M. Nikitas, J.-P. Mendiburu, Jorma Tuominiemi, Dave Robinson, A. Placci, E. Pietarinen, Daniel Denegri, A. Diciaccio, R. Priem, Michael Albrow, H. Wagner, H. Faissner, L. Naumann, Y. Lemoigne, D. Linglin, H. Tuchscherer, S. A. Robins, L. Zanello, R. Apsimon, R. Munoz, A. Moulin, B. Buschbeck, Th. Müller, W. Jank, M. Felcini, Carmen Albajar, and G. Pancheri
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Luminosity (scattering theory), 010308 nuclear & particles physics, Branching fraction, Hadron, 01 natural sciences, law.invention, Nuclear physics, Direct production, law, 0103 physical sciences, Radiative transfer, Production (computer science), 010306 general physics, Collider
Abstract: We have measured the production cross-section times branching ratio for J/ψ→μ+μ− in pp interactions at √s = 630 GeV in the kinematic range |y| and p T >5 GeV /c, BR ( J /ψ→μ + μ − )σ( p p → J /ψ)=6.18±0.24±0.81 nb . The data sample collected in 1988 and 1989 for an integrated luminosity of 4.7 pb−1 represents a fivefold improvement over the statistics in our earlier study of the J/ψ production process, and the pT distribution which is measured extends to 28 GeV/c. Using event topology we show that the rate for the direct production of J/ψ, via radiative decays of χ states, is larger than that for production via B-hadrons. Production of ψ′ is also studied using the decay modes
Published: 1991

15. A study of the D∗ content of jets at the CERN p collider

Author: I. F. Fensome, Carmen Albajar, S. Levegrün, G. Bauer, G. Pancheri, E. Eisenhandler, C. D. Buchanan, K. Morgan, R. Martinelli, T. P. Shah, V. Vuillemin, W. von Schlippe, K. Bos, P. Cennini, S. Tether, Christopher Seez, D. Joyce, A. Moulin, G. Busetto, Steve McMahon, Anton Taurok, A. Bezaguet, M. Passaseo, J.P. Vialle, K. Eggert, Ritva Kinnunen, M. Felcini, D. Brockhausen, B. Buschbeck, Claudia J. Stubenrauch, S. Lammel, A. Gonidec, D. J. Holthuizen, T. Moers, J. P. Mendiburu, H. Faissner, Th. Müller, W. Jank, M. Nikitas, D. Drijard, Stephen Wimpenny, Sergio Cittolin, E. Pietarinen, Daniel Denegri, O. C. Allkofer, P. Nedelec, S. Bartha, S. Centro, M. Rauschkolb, A. Kernan, S. A. Robins, M. A. Marquina, Alessandro Bettini, G. Thompson, C. Markou, B. Andrieu, A. Morsch, D. Kryn, I. Zacharov, L. Dobrzynski, G.F. Cox, H. Castilla-Valdez, J. Vrana, M. Demoulin, Stefano Veneziano, Daniel J. Smith, P. Casoli, A. Geiser, G. Jorat, F. Szoncso, L. Zanello, Jonathan M. Gregory, Matthias Schröder, J. D. Dowell, A. Diciaccio, K. Ankoviak, Teresa Rodrigo, David B. Cline, L. Taylor, D. Schinzel, A. Caner, Nicolas Ellis, P. Biddulph, M. P. J. Landon, P. I. P. Kalmus, Veikko Karimäki, R. Apsimon, R. Munoz, V. O'Dell, Emilio Petrolo, L. Fortson, C. Bacci, K. Wacker, Hans Reithler, M. Mohammadi, James Rohlf, H. Bohn, A. van Dijk, Manfred Krammer, Konstanty Sumorok, Pierluigi Zotto, J. Salicio, E. F. Clayton, D. Samyn, R. Prosi, C. Daum, C.-E. Wulz, J. Dorenbosch, R. Conte, G. Maurin, B. Gonzales, M. Markytan, J. P. Porte, E. Torrente-Lujan, J. P. Revol, S. Otwinowski, X. Wu, Paraskevas Sphicas, W. van de Guchte, M. Pimiä, J. Colas, M. Botlo, J. Gronberg, Tejinder Virdee, Francesco Lacava, A. Norton, F. Cavanna, Jorma Tuominiemi, Alain Givernaud, G. Piano Mortari, John A Coughlan, F. J. Diez Hedo, E. Radermacher, Michael Albrow, Anna Teresa Meneguzzo, A. Ferrando, Peter Lipa, M. Lindgren, Ludovico Pontecorvo, D. Dau, M. Della Negra, Maria Isabel Josa, R. Bonino, T. C. Meyer, L. Naumann, Y. Lemoigne, D. Linglin, H. Tuchscherer, Aleandro Nisati, M. Yvert, H. Evans, G. Ciapetti, Jean-Pierre Merlo, C. Rubbia, D. H. Stork, J. Garvey, M. Vargas, Y. Zolnierowski, Felicitas Pauss, M. Ikeda, Filippo Ceradini, T. A. Fuess, B. Aubert, Dave Robinson, A. Placci, I. R. Kenyon, H. Dibon, A. Böhrer, and G. Sajot
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson production, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 01 natural sciences, 7. Clean energy, Nuclear physics, Transverse plane, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: We have measured the rate of D∗± meson production inside the jets produced in p p collisions at √s = 630 GeV. For jets in the transverse energy range 15
Published: 1990

16. Inclusive D*+- production in photon-photon collisions

Author: G. Shapiro, L. G. Mathis, S. Yellin, J. J. Eastman, T. K. Edberg, S. K. Park, S. Khacheryan, S. Toutounchi, P. J. Oddone, R. W. Stephens, J. S. Steinman, W. Vernon, A. Bay, G. Zapalac, W. T. Lin, C. Zeitlin, Margaret Alston-Garnjost, D. A. Crane, B. C. Shen, G. Masek, R. R. Ross, K. H. Fairfield, H. P. Paar, A. Lu, Elliott D. Bloom, R. R. Kofler, Y. T. Oyang, S. B. Chun, R. J. Madaras, G. Lynch, M. L. Stevenson, D. H. Stork, J. Lys, J. G. Layter, D. A. Bauer, R. E. Avery, K. T. Knopfle, H. Marsiske, S. C. Loken, M. T. Roman, H. Yamamoto, J. M. Hauptman, E. M. Wang, Orin I. Dahl, P. H. Eberhard, E. S. Miller, G. Godfrey, D. R. Nygren, Werner Hofmann, N. A. Nicol, F. C. Erné, H. Y. Chao, F.L. Linde, M. Pripstein, Allan G Clark, George P Yost, A. Buijs, C. D. Buchanan, M. Daoudi, M. G. Strauss, R. Belcinski, H. H. Bingham, A. R. Barker, D. E. Pellett, D. J. Lambert, W. A. Wenzel, Y. X. Wang, M. K. Sullivan, Willem G. J. Langeveld, R. W. Kenney, A. M. Eisner, A. P.T. Palounek, J. C. Sens, D. O. Caldwell, and IHEF (IoP, FNWI)
Subjects: Physics, Quark, Nuclear and High Energy Physics, Particle physics, Photon, Meson, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Parton, Hadronization, Nuclear physics, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment
Abstract: The TPC/Two-Gamma Collaboration has measured the inclusive cross section for production of charmed D∗± mesons in photon-photon collisions. The reaction utilized was e+e-→e+e-D∗±X, with D∗±→DOπ+-, DO→K-+π ±, and either zero or one outgoing e± detected. The result, σ(e + e - → e + e - D ∗± X) = 74±26±19 pb , is in agreement with the quark parton mo del prediction for e+e- → e+e-c c , combined with a Lund model for the hadronization of the charmed quarks.
Published: 1990

17. Exclusive Production ofK+K−π+π−in Photon-Photon Collisions

Author: H. Aihara, M. Alston-Garnjost, J. C. Armitage, J. A. Bakken, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, H. -U. Bengtsson, D. L. Bintinger, B. J. Blumenfeld, G. J. Bobbink, A. D. Bross, C. D. Buchanan, A. Buijs, M. P. Cain, D. O. Caldwell, O. Chamberlain, C. -Y. Chien, A. R. Clark, A. Cordier, O. I. Dahl, C. T. Day, K. A. Derby, M. A. van Driel, P. H. Eberhard, A. M. Eisner, F. C. Erne, D. L. Fancher, H. Fujii, T. Fujii, B. Gabioud, J. W. Gary, W. Gorn, N. J. Hadley, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, U. P. Joshi, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X. -Q. Lu, G. R. Lynch, L. Madansky, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, K. Maruyama, G. E. Masek, J. A. J. Matthews, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Palmer, D. A. Park, D. E. Pellett, A. Pevsner, M. Pripstein, P. R. Robrish, M. T. Ronan, R. R. Ross, F. R. Rouse, R. R. Sauerwein, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, M. L. Stevenson, D. H. Stork, M. K. Sullivan, J. R. Thompson, H. K. Ticho, J. Timmer, N. Toge, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, H. Yamamoto, M. Yamauchi, S. J. Yellin, and W. -M. Zhang
Subjects: Physics, Nuclear physics, Pair production, Pion, Annihilation, Meson, Branching fraction, Hadron, Mass spectrum, General Physics and Astronomy, Particle identification
Abstract: We report a measurement of the reaction ..gamma gamma -->..K/sup +/K/sup -/..pi../sup +/..pi../sup -/ in both tagged and untagged events at PEP. The cross section rises with invariant ..gamma gamma.. mass to about 15 nb at 2 GeV and falls slowly at higher masses. We find clear evidence for the processes ..gamma gamma -->..phi..pi../sup +/..pi../sup -/ and ..gamma gamma -->..K/sup asterisk0/(892)K..pi... Upper limits (95% C.L.) of 1.5 and 5.7 nb in the mass range from 1.7 to 3.7 GeV are obtained for phirho/sup 0/ and K/sup asterisk0/K/sup asterisk0/ production, respectively.
Published: 1985

18. Angular distributions of 250 GeV/c positive particles axially channeled in germanium crystal

Author: A. Kanofsky, J. Kubic, I.J. Kim, B.L. Chrisman, Z. Guzik, E.N. Tsyganov, T.S. Nigmanov, G. O. Williams, W.M. Gibson, C.R. Sun, A.S. Vodopianov, T.E. Toohig, R.A. Carrigan, D. H. Stork, A.B. Watson, M.A. Hasan, and R. Allen
Subjects: Momentum, Physics, Total internal reflection, Low energy, General Engineering, Germanium crystal, Atomic physics, Axial symmetry, Charged particle, Computer Science::Information Theory
Abstract: Channeling phenomena are observed for charged particles of momentum up to 250 GeV/c in a germanium crystal. The angular distributions of the channeled particles are compared with theoretical predictions based on a diffusion model. The results indicate additional mechanisms leading to dechanneling of the particles although channeling effects are observed for particles incident at up to several times the critical angle, in contrast with the results from low energy channeling.
Published: 1982

19. K*0andKS0Meson Production ine+e−Annihilations at 29 GeV

Author: J. M. Hauptman, A. Barbaro-Galtieri, B. Gabioud, B. C. Shen, L. Madansky, W.A. Wenzel, J. E. Huth, J. Hylen, H. Yamamoto, W. Moses, C. S. Lindsey, Gilbert Shapiro, R. I. Koda, M. L. Stevenson, S. C. Loken, T. Kamae, G. J. VanDalen, K. A. Derby, W. M. Zhang, F. R. Rouse, Q. Chamberlain, A. Cordier, A. Pevsner, Hirotsugu Fujii, D. A. Park, R. R. Kofler, Peter Nemethy, Philippe Eberhard, G. R. Lynch, Toshitsugu Fujii, N. Toge, Marjorie Shapiro, Orin I. Dahl, R. F. van Daalen Wetters, C. Y. Chien, Nicholas John Hadley, M. T. Ronan, E. M. Wang, M. Yamauchi, Hiroaki Aihara, Werner Hofmann, B. A. Barnett, L. T. Kerth, J. W. Gary, K. K. Kwong, Margaret Alston-Garnjost, R. van Tyen, A. D. Bross, W. E. Slater, Mitchell Wayne, A. R. Clark, A. V. Barnes, D. L. Fancher, D. H. Stork, P. J. Oddone, R. R. Sauerwein, J. G. Layter, K. Maruyama, R. R. Ross, H. K. Ticho, R. J. Madaras, J. A. Bakken, W. Gorn, H. S. Kaye, Barry Blumenfeld, C. D. Buchanan, C. T. Day, P. R. Robrish, J. N. Marx, X. Q. Lu, D. R. Nygren, J. A. J. Matthews, M. Pripstein, S. O. Melnikoff, and R. W. Kenney
Subjects: Nuclear physics, Physics, Particle physics, Antiparticle, Annihilation, Pion, Meson, Antimatter, Electron–positron annihilation, Hadron, General Physics and Astronomy, Elementary particle
Abstract: The inclusive production cross sections and transverse momentum distributions of ${K}^{*0}$ and ${{K}_{S}}^{0}$ mesons in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at a center-of-mass energy of 29 GeV have been measured by means of the time projection chamber detector in the PEP-4 experiment. The mean multiplicites are found to be 0.49 \ifmmode\pm\else\textpm\fi{} 0.04(stat.) \ifmmode\pm\else\textpm\fi{} 0.07(syst.) (${K}^{*0}+{\stackrel{-}{K}}^{*0}$) and 1.22 \ifmmode\pm\else\textpm\fi{} 0.03(stat.) \ifmmode\pm\else\textpm\fi{}0.15(syst.) (${K}^{0}+{\stackrel{-}{K}}^{0}$) per event.
Published: 1984

20. A Muon Detection System for the PEP4 Facility

Author: Hirotsugu Fujii, B. C. Shen, D. A. Park, O. Chamberlain, W. E. Slater, A. Barbaro-Galtieri, G. Lynch, T. Kamae, C. S. Lindsey, W. Gorn, M. L. Stevenson, X-Q. Lu, K. K. Kwong, William A. Wenzel, J. A. Bakken, J. W. Gary, C. D. Buchanan, R. R. Kofler, D. H. Badtke, R. W. Kenney, Orin I. Dahl, J. Mallet, G. J. Van Dalen, Allan G Clark, J. N. Marx, M. Yamauchi, K. A. Derby, H. Hilke, J. Chiba, Marjorie Shapiro, J. M. Hauptman, W. Moses, R. van Tyen, A. D. Bross, H. Iwasaki, L. Madansky, P. S. Martin, J. Hylen, Ronald R. Ross, J. E. Huth, W-M. Zhang, Hiroaki Aihara, R. I. Koda, N. Toge, M. Alston-Garnjost, R. J. Madaras, F. R. Rouse, L. T. Kerth, D. H. Stork, D. L. Fancher, B. Heck, C. T. Day, H. Videau, W. J. Spangler, N. J. Hadley, J. G. Layter, R. Majka, R. F. vanDaalen Wetters, S. C. Loken, W. C. Carithers, M. E. Zeller, P. H. Eberhard, B. Gabioud, P. Delpiee, Mitchell Wayne, P. J. Oddone, A. V. Barnes, J. A. J. Matthews, P. Nemethy, M. T. Ronan, P. R. Robrish, M. Pripstein, C.Y. Chien, G. Shapiro, S. O. Melnikoff, K. Maruyama, H. K. Ticho, A. Pevsner, Barry Blumenfeld, D. R. Nygren, B. A. Barnett, and T. Fujii
Subjects: Physics, Nuclear and High Energy Physics, Muon, business.industry, Detector, Particle detector, Linear particle accelerator, Nuclear physics, Software, Nuclear Energy and Engineering, Measuring instrument, Electrical and Electronic Engineering, business, Computer hardware
Abstract: A large muon detection system has been constructed and is fully operational in the PEP 4 facility. It is more than 99.6% efficient. The system is rugged and reliable. It is possible to verify the integrity of all the chambers in a few minutes. Associated software for identifying muons has been written and is working.
Published: 1983

21. Performance of a Drift Chamber System for the Time Projection Chamber Detector Facility at PEP

Author: B. A. Barnett, J. Mallet, A. Barbaro-Galtieri, M. E. Zeller, M. Urban, P. S. Martin, A. D. Bross, Mitchell Wayne, Ronald R. Ross, W-M. Zhang, L. Madansky, R. Majka, N. Toge, G. J. Van Dalen, R. I. Koda, H. Videau, M. Pripstein, J. G. Layter, J. M. Hauptman, R. J. Madaras, R. F. vanDaalen Wetters, K. Maruyama, C.Y. Chien, N. J. Hadley, B. Gabioud, A. V. Barnes, P. J. Oddone, D. R. Nygren, J. A. J. Matthews, M. T. Ronan, M. Yamauchi, P. R. Robrish, G. Shapiro, R. R. Kofler, R. van Tyen, Marjorie Shapiro, W. Moses, F. R. Rouse, B. C. Shen, Orin I. Dahl, W. Gorn, H. K. Ticho, P. Nemethy, S. O. Melnikoff, S. C. Loken, Hirotsugu Fujii, H. Iwasaki, Clark S. Lindsey, J. Chiba, D. A. Park, O. Chamberlain, William A. Wenzel, C. S. Lindsey, W. C. Carithers, L. T. Kerth, H-J. Hilke, Allan G Clark, C. D. Buchanan, J. Hylen, P. H. Eberhard, Hiroaki Aihara, G. Lynch, T. Kamae, J. A. Bakken, B. Heck, C. T. Day, P. Delpierre, T. Ftjii, M. L. Stevenson, X-Q. Lu, D. H. Stork, D. H. Badtke, A. Pevsner, R. W. Kenney, W. E. Slater, Barry Blumenfeld, K. A. Derby, J. W. Gary, J. E. Huth, M. Alston-Garnjost, D. L. Fancher, J. N. Marx, and K. K. Kwong
Subjects: Physics, Nuclear and High Energy Physics, Signal generator, Time projection chamber, Physics::Instrumentation and Detectors, business.industry, Detector, Cosmic ray, Tracking (particle physics), Particle detector, Nuclear physics, Momentum, Optics, Nuclear Energy and Engineering, Measuring instrument, Electrical and Electronic Engineering, business
Abstract: A svstem of two cylindrical drift chambers has been designed and constructed to trigger the Time Projection Chamber and to assist in tracking and momentum reconstruction. Performance of these chambers has been studied with data collected from cosmic rays and actual e+e-collisions during recent experimental runs.
Published: 1983

22. Prompt muon production ine+e−annihilations at 29 GeV

Author: R. I. Koda, C. T. Day, J. E. Huth, D. R. Nygren, P. J. Oddone, M. Pripstein, H. U. Bengtsson, A. Cordier, D. H. Stork, B. Gabioud, J. A. Bakken, Hiroaki Aihara, A. Pevsner, G. R. Lynch, C. S. Lindsey, K. A. Derby, H. Yamamoto, B. A. Barnett, D. A. Park, L. T. Kerth, R. R. Sauerwein, R. R. Ross, Tuneyoshi Kamae, J. W. Gary, M. Yamauchi, P. R. Robrish, W. E. Slater, D. H. Badtke, O. Chamberlain, R. J. Madaras, J. N. Marx, Em Wang, B. C. Shen, A. Barbaro-Galtieri, W. Moses, F. R. Rouse, W. M. Zhang, Peter Nemethy, O. I. Dahl, L. Madansky, R. F. van Daalen Wetters, M. Alston-Garnjost, J. Hylen, R. W. Kenney, H. K. Ticho, A. R. Clark, X. Q. Lu, W. A. Wenzel, Hirotsugu Fujii, A. V. Barnes, N. Toge, A. D. Bross, M. T. Ronan, J. G. Layter, M. R. Wayne, G. J. Vandalen, W. Gorn, W. Hofmann, S. O. Melnikoff, C. Y. Chien, M. D. Shapiro, G. Shapiro, P. H. Eberhard, J. M. Hauptman, D. L. Fancher, N. J. Hadley, K. K. Kwong, T. Fujii, J. A J Matthews, B. J. Blumenfeld, S. C. Loken, K. Maruyama, R. R. Kofler, R. van Tyen, M. L. Stevenson, H. S. Kaye, and C. D. Buchanan
Subjects: Nuclear physics, Quark, Physics, Particle physics, Muon, Annihilation, Hadron, Bottom quark, Charm quark
Abstract: We have studied the production of prompt muons in hadronic events from ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilation at a center-of-mass energy of 29 GeV with the PEP4-TPC (Time Projection Chamber) detector. The muon p and ${p}_{t}$ distributions are well described by a combination of bottom- and charm-quark decays, with fitted semimuonic branching fractions of (15.2\ifmmode\pm\else\textpm\fi{}1.9\ifmmode\pm\else\textpm\fi{}1.2)% and (6.9\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}1.1)%, respectively. The muon spectra imply hard fragmentation functions for both b and c quarks, with 〈z(b quark)〉=0.80\ifmmode\pm\else\textpm\fi{}0.05\ifmmode\pm\else\textpm\fi{}0.05 and 〈z(c quark)〉=0.60\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.04. We derive neutral-current axial-vector couplings of a(b quark)=-0.9\ifmmode\pm\else\textpm\fi{}1.1\ifmmode\pm\else\textpm\fi{}0.3 and a(c quark)=1.5\ifmmode\pm\else\textpm\fi{}1.5\ifmmode\pm\else\textpm\fi{}0.5 from the forward-backward asymmetries.
Published: 1985

23. Exclusive production ofpp¯π+π−in photon-photon collisions

Author: T. K. Edberg, H. Y. Chao, K. A. Derby, W. T. Lin, M. K. Sullivan, S. K. Park, T. Kamae, E. S. Miller, J. J. Eastman, S. Toutounchi, S. Khacheryan, H. S. Kaye, J. A. J. Matthews, Robert W. Kenney, J. C. Sens, F.L. Linde, D. O. Caldwell, A. Bay, J. G. Layter, G. D. Cowan, C. D. Buchanan, M. G. Strauss, D. A. Crane, C. Zeitlin, H. P. Paar, K. A. Schwitkis, D. E. Pellett, W. Moses, Y. X. Wang, J. M. Hauptman, M. Pripstein, Angela Barbaro-Galtieri, F. C. Erné, Margaret Alston-Garnjost, R. van Tyen, A. M. Eisner, M. Daoudi, R. E. Avery, Ronald R. Ross, Orin I. Dahl, Tadayuki Takahashi, B. C. Shen, Z. R. Wolf, E. M. Wang, Willem G. J. Langeveld, J. Hylen, G. Masek, F. R. Rouse, H. Yamamoto, J. R. Smith, S. J. Yellin, A. R. Barker, R. W. Stephens, S. C. Loken, R. J. Madaras, D. H. Stork, A. R. Clark, M. L. Stevenson, Gilbert Shapiro, D. A. Bauer, W. Wagner, G. J. Bobbink, J. S. Steinman, Werner Hofmann, William A. Wenzel, L. G. Mathis, K. H. Fairfield, H. Aihara, P. J. Oddone, B. A. Barnett, R. R. Kofler, S. B. Chun, G. Lynch, B. D. Magnuson, D. R. Nygren, Philippe Eberhard, S. J. Maxfield, A. Buijs, W. Vernon, and M. T. Ronan
Subjects: Physics, Particle physics, Crystallography, Antiparticle, Meson, Hadron, Production (computer science), Elementary particle, Lambda baryon, Energy (signal processing), Bar (unit)
Abstract: We report a measurement of the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}p\overline{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ process with the TPC/Two-Gamma facility at the PEP ${e}^{+}{e}^{\ensuremath{-}}$ storage ring at SLAC. Forty-five $p\overline{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ events were identified in data corresponding to an integrated ${e}^{+}{e}^{\ensuremath{-}}$ luminosity of 142 ${\mathrm{pb}}^{\ensuremath{-}1}$. The cross section for $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}p\overline{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ is given both as a function of the $\ensuremath{\gamma}\ensuremath{\gamma}$ center-of-mass energy ${W}_{\ensuremath{\gamma}\ensuremath{\gamma}}$, with ${W}_{\ensuremath{\gamma}\ensuremath{\gamma}}$ between 2.5 and 5.5 GeV, and as a function of the in variant mass squared ${q}^{2}$ of one of the photons, with $\ensuremath{-}{q}^{2}l7$ Ge${\mathrm{V}}^{2}$. This cross section falls much less rapidly with ${W}_{\ensuremath{\gamma}\ensuremath{\gamma}}$ than does the cross section for a similar process, $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}p\overline{p}$. No ${\ensuremath{\Delta}}^{0}{\overline{\ensuremath{\Delta}}}^{0}$ production is observed, and only a small fraction of the events at low ${W}_{\ensuremath{\gamma}\ensuremath{\gamma}}$ is consistent with $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\Delta}}^{++}{\overline{\ensuremath{\Delta}}}^{\ensuremath{-}\ensuremath{-}}$, ${\ensuremath{\Delta}}^{++}\overline{p}{\ensuremath{\pi}}^{\ensuremath{-}}$, or ${\overline{\ensuremath{\Delta}}}^{\ensuremath{-}\ensuremath{-}}p{\ensuremath{\pi}}^{+}$. In an expanded search through the same data, four events compatible with either $\ensuremath{\Lambda}\overline{\ensuremath{\Lambda}}(\ensuremath{\Lambda}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{\ensuremath{-}})$ or ${\ensuremath{\Sigma}}^{0}\overline{\ensuremath{\Lambda}}({\ensuremath{\Sigma}}^{0}\ensuremath{\rightarrow}\ensuremath{\Lambda}\ensuremath{\gamma})$ production were found.
Published: 1989

24. Study of baryon correlations ine+e−annihilation at 29 GeV

Author: A. Lu, Peter Nemethy, J. S. Steinman, J. E. Huth, B. C. Shen, S. Toutounchi, T. Kamae, L. Mathis, R. R. McNeil, A. Barbaro-Galtieri, R. R. van Daalen Wetters, B. A. Barnett, R. Lander, Kaori Maeshima, C. D. Buchanan, S. C. Loken, E. M. Wang, D. E. Pellet, Margaret Alston-Garnjost, R. van Tyen, W. G.J. Langeveld, H. U. Bengtsson, B. van Uitert, G. E. Masek, E. S. Miller, X. Q. Lu, K. A. Schwitkis, H. Yamamoto, S. O. Melnikoff, Hiroaki Aihara, J. N. Marx, R. I. Koda, J. Hylen, N. Toge, S. J. Yellin, S. J. Maxfield, C. Zeitlin, F. R. Rouse, C. S. Lindsey, K. A. Derby, R. W. Kenney, J. T. White, J. C. Sens, D. O. Caldwell, W. Vernon, M. S. C. Williams, Z. R. Wolf, G. Cowan, Mitchell Wayne, J. Thompson, Marjorie Shapiro, W. Moses, G. J. VanDalen, B. D. Magnuson, J. W. Gary, D. A. Park, Toshitsugu Fujii, Philippe Eberhard, H. S. Kaye, T. K. Edberg, G. R. Lynch, Y. X. Wang, Tadayuki Takahashi, Ryoji Enomoto, W. E. Slater, M. G. Strauss, A. Buijs, P. J. Oddone, F.L. Linde, Werner Hofmann, R.E. Avery, R. R. Ross, T. Bolognese, H. P. Paar, R. J. Madaras, D. A. Crane, W. Gorn, S. K. Park, J. J. Eastman, W.A. Wenzel, Gilbert Shapiro, M. L. Stevenson, M. T. Ronan, K. K. Kwong, M. Pripstein, J. A. J. Matthews, M. K. Sullivan, A. D. Bross, A.R. Barker, J. R. Smith, K. H. Kees, D. R. Nygren, J. M. Hauptman, W. M. Zhang, R. R. Kofler, F. C. Erné, A. M. Eisner, Winston Ko, G. J. Bobbink, Orin I. Dahl, D. L. Bintinger, Wolfgang Wagner, A. R. Clark, D.A. Bauer, L. T. Kerth, A. V. Barnes, D. H. Stork, and J. G. Layter
Subjects: Baryon, Nuclear physics, Physics, Particle physics, Annihilation, Electron–positron annihilation, General Physics and Astronomy
Published: 1986

25. ΛProduction ine+e−Annihilation at 29 GeV

Author: B. A. Barnett, B. Gabioud, W. E. Slater, G. J. VanDalen, A. Pevsner, Hirotsugu Fujii, D. A. Park, Philippe Eberhard, A. Barbaro-Galtieri, J. W. Gary, W. Gorn, G. R. Lynch, C. S. Lindsey, K. Maruyama, R. F. van Daalen Wetters, Marjorie Shapiro, C. Y. Chien, K. A. Derby, W. Moses, M. Pripstein, L. T. Kerth, Werner Hofmann, H. K. Ticho, J. A. Bakken, P. J. Oddone, H. S. Kaye, J. E. Huth, R. R. Ross, M. T. Ronan, K. K. Kwong, R. J. Madaras, A. R. Clark, D. L. Fancher, H. Aihara, M. Yamauchi, A. Cordier, L. Madansky, J. M. Hauptman, C. D. Buchanan, J. Hylen, T. Kamae, H. Yamamoto, R. I. Koda, D. R. Nygren, Peter Nemethy, Barry Blumenfeld, A. D. Bross, J. A. J. Matthews, S. C. Loken, Owen Chamberlain, W.A. Wenzel, Gilbert Shapiro, Nicholas John Hadley, F. R. Rouse, M. L. Stevenson, X. Q. Lu, Mitchell Wayne, Toshitsugu Fujii, E. M. Wang, Margaret Alston-Garnjost, R. van Tyen, B. C. Shen, P. R. Robrish, S. O. Melnikoff, R. W. Kenney, N. Toge, W. M. Zhang, R. R. Kofler, J. N. Marx, Orin I. Dahl, C. T. Day, A. V. Barnes, D. H. Stork, R. R. Sauerwein, and J. G. Layter
Subjects: Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, General Physics and Astronomy, Lambda baryon, Lambda, Baryon, Pair production, Antimatter, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment
Abstract: The inclusive production cross section of ..lambda.., anti ..lambda.. in e/sup +/e/sup -/ annihilation at a c.m. energy of 29 GeV has been measured with the time-projection-chamber detector at PEP. The average lambda, anti lambda multiplicity has been measured to be 0.197 +/- 0.012 (stat.) +/- 0.017 (syst.). ..lambda..-anti..lambda.. pairs have been observed in jets for the first time, and the average number of ..lambda..-anti..lambda.. pairs per event has been measured to be 0.042 +/- 0.017 +/- 0.014. 8 references, 3 figures.
Published: 1985

26. Tests of Models for Parton Fragmentation by Means of Three-Jet Events ine+e−Annihilation ats=29GeV

Author: B. A. Barnett, W. M. Zhang, G. R. Lynch, R. R. Kofler, Mitchell Wayne, C. Y. Chien, L. Madansky, R. I. Koda, Orin I. Dahl, D. R. Nygren, N. Toge, J. A. Bakken, H. S. Kaye, Werner Hofmann, W. Moses, E. M. Wang, A. R. Clark, Margaret Alston-Garnjost, R. van Tyen, A. Cordier, Barry Blumenfeld, A. Pevsner, H. U. Bengtsson, J. G. Layter, B. Gabioud, Owen Chamberlain, J. N. Marx, Marjorie Shapiro, B. C. Shen, J. M. Hauptman, Peter Nemethy, J. E. Huth, Toshitsugu Fujii, Nicholas John Hadley, H. Yamamoto, D. L. Fancher, A. Barbaro-Galtieri, Y. Yamauchi, T. Kamae, C. T. Day, J. A. J. Matthews, K. Maruyama, Philippe Eberhard, J. W. Gary, F. R. Rouse, A. V. Barnes, S. O. Melnikoff, H. K. Ticho, R. F. van Daalen Wetters, D. H. Stork, A. D. Bross, P. R. Robrish, W.A. Wenzel, Gilbert Shapiro, R. R. Sauerwein, C. S. Lindsey, J. Hylen, W. E. Slater, L. T. Kerth, M. Pripstein, R. W. Kenney, X. Q. Lu, M. L. Stevenson, M. T. Ronan, K. A. Derby, K. K. Kwong, H. Aihara, G. J. VanDalen, Hirotsugu Fujii, D. A. Park, S. C. Loken, C. D. Buchanan, P. J. Oddone, R. R. Ross, R. J. Madaras, and W. Gorn
Subjects: Quantum chromodynamics, Physics, Particle physics, Annihilation, Mathematical model, Quark model, Hadron, Lund string model, General Physics and Astronomy, Parton, Elementary particle, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The distribution of particles in three-jet events is compared with the predictions of three fragmentation models currently in use: the Lund string model, the Webber cluster model, and an independent fragmentation model. The Lund model and, to a certain extent, the Webber model provide reasonable descriptions of the data. The independent fragmentation model does not describe the distribution of particles at large angles with respect to the jet axes. The results provide evidence that the sources of hadrons are Lorentz boosted with respect to the overall c.m.
Published: 1985

27. Performance of the hexagonal calorimeter at PEP-4

Author: S. C. Loken, P. J. Oddone, P. S. Martin, R. R. Ross, R. J. Madaras, J. A. Bakken, N. J. Hadley, C.Y. Chien, C. D. Buchanan, G. W. London, J. Hylen, M. E. Zeller, C. T. Day, J. N. Marx, O. Chamberlain, M. D. Shapiro, J. M. Hauptman, R. F. van Daalen Wetters, G. R. Lynch, Hiroaki Aihara, Mitchell Wayne, P. R. Robrish, X. Q. Lu, W. Gorn, A. Pevsner, H. J. Hilke, L. T. Kerth, H. Iwasaki, Barry Blumenfeld, B. Gabioud, J. Chiba, K. Maruyama, W. A. Wenzel, F. R. Rouse, H. Fujii, Werner Hofmann, D. R. Nygren, H. K. Ticho, J. A. J. Matthews, J. W. Gary, M. Pripstein, J. Mallet, D. L. Fancher, P. H. Eberhard, R. van Tyen, G. Shapiro, W. Moses, B. C. Shen, B. Heck, G. J. Van Dalen, M. Yamauchi, O. I. Dahl, William Carithers, M. Alston-Garnjost, L. Madansky, A. R. Clark, B. A. Barnett, R. I. Koda, H. Videau, S. O. Melnikoff, D. H. Badtke, A. D. Bross, R. M. Majka, W. M. Zhang, R. W. Kenney, R. R. Kofler, J. G. Layter, M. Urban, A. V. Barnes, D. H. Stork, W. E. Slater, P. Delpierre, C. S. Lindsey, A. Barbaro-Galtieri, J. E. Huth, K. A. Derby, P. Nemethy, M. L. Stevenson, T. Kamae, D. A. Park, N. Toge, M. T. Ronan, and K. K. Kwong
Subjects: Physics, Jet (fluid), Calorimeter (particle physics), Physics::Instrumentation and Detectors, business.industry, Monte Carlo method, General Engineering, Solid angle, STRIPS, law.invention, Optics, law, Calibration, High Energy Physics::Experiment, business, Image resolution, Projective geometry
Abstract: A Geiger-mode electromagnetic shower calorimeter has been constructed for PEP-4. Six trapezoidal modules cover 75% of 4 π solid angle in a hexagonal array. Each module contains 40 sense wire planes between 0.25 radiation-length thick lead-laminates, and is divided electrically into submodules of 27 and 13 layers. Half-degree wide hodoscopic channels in projective geometry provide excellent spatial resolution. In each gap three stereo views using the sense wires as well as strips on both cathodes at ±60° to the wires provide good shower reconstruction capabilities in multi-track jet events. Calibration and data analysis procedures are outlined. The performance of the calorimeter in the measurement of Bhabha events and the reconstruction of π 0 's in jet events is in excellent agreement with Monte Carlo simulations. The π 0 mass resolution is MeV (rms).
Published: 1983

28. Spatial Resolution of the PEP-4 Time Projection Chamber

Author: B. C. Shen, K. A. Derby, D. H. Badtke, R. W. Kenney, A. Pevsner, H. Iwasaki, F. R. Rouse, Barry Blumenfeld, O. I. Dahl, J. E. Huth, A. Barbaro-Galtieri, M. Alston-Garnjost, K. Maruyama, L. Madansky, J. Chiba, J. Hylen, B. A. Barnett, R. I. Koda, Hiroaki Aihara, R. van Tyen, R. R. Kofler, J. M. Hauptman, H. K. Ticho, B. Gabioud, P. S. Martin, T. Fujii, R. J. Madaras, W. A. Wenzel, C. S. Lindsey, S. O. Melnikoff, M. E. Zeller, M. L. Stevenson, X-Q. Lu, M. D. Shapiro, J. G. Layter, A. D. Bross, J. N. Marx, Mitchell Wayne, H. Videau, D. R. Nygren, W. Moses, R. F. vanDaalen Wetters, J. W. Gary, P. Delpierre, P. J. Oddone, N. J. Hadley, N. Toge, J. A. Bakken, M. Yamauchi, G. Shapiro, Ronald Madaras, P. Nemethy, A. V. Barnes, R. R. Ross, H. Hilke, M. Pripstein, J. A. J. Matthews, G. J. Van Dalen, G. R. Lynch, Allan G Clark, D. H. Stork, P. R. Robrish, D. L. Fancher, J. Mallet, D. A. Park, O. Chamberlain, R. Majka, S. C. Loken, W. C. Carithers, P. H. Eberhard, C.Y. Chien, K. K. Kwong, H. Fujii, W-M. Zhang, M. T. Ronan, T. Kamae, W. E. Slater, C. D. Buchanan, M. Urban, W. Gorn, B. Heck, C. T. Day, and L. T. Kerth
Subjects: Physics, Nuclear and High Energy Physics, Argon, Time projection chamber, Physics::Instrumentation and Detectors, business.industry, Resolution (electron density), chemistry.chemical_element, Particle detector, Cathode, Magnetic field, law.invention, Optics, Nuclear magnetic resonance, Nuclear Energy and Engineering, chemistry, Physics::Plasma Physics, law, Measuring instrument, Electrical and Electronic Engineering, business, Image resolution
Abstract: The spatial resolution and response of the segmented cathode pads of the PEP-4 TPC have been measured with data taken at 8.5 atmospheres of 80% Argon-20% Methane gas with a 4kG magnetic field. The dependence of the spatial resolution and pad response on drift distance and track-anode crossing angle is presented.
Published: 1983

29. Tests of models for quark and gluon fragmentation ine + e − annihilation at $$\sqrt s = 29 GeV$$

Author: R. I. Koda, J. A. J. Matthews, H. Yamamoto, R. R. Kofler, K. A. Derby, P. Nemethy, T. Kamae, H. K. Ticho, D. H. Stork, R. J. Madaras, W. Moses, H. Fujii, J. E. Huth, M. Yamauchi, F. R. Rouse, W. M. Zhang, H. S. Kaye, A. V. Barnes, Ronald R. Ross, R. F. van Daalen Wetters, C. Y. Chien, R. R. Sauerwein, P. R. Robrish, A. Cordier, Marjorie Shapiro, B. Gabioud, C. D. Buchanan, M. Pripstein, A. Pevsner, N. J. Hadley, C. S. Lindsey, L. Madansky, A. D. Bross, S. O. Melnikoff, L. T. Kerth, Orin I. Dahl, M. T. Ronan, Gilbert Shapiro, M. R. Wayne, C. T. Day, J. G. Layter, Robert W. Kenney, William A. Wenzel, B. C. Shen, G. Lynch, Angela Barbaro-Galtieri, G. J. van Dalen, B. J. Blumenfeld, P. J. Oddone, J. Hylen, Werner Hofmann, D. A. Park, W. Gorn, J. W. Gary, S. C. Loken, Margaret Alston-Garnjost, R. van Tyen, W. E. Slater, X. Q. Lu, B. A. Barnett, Philippe Eberhard, K. Maruyama, J. A. Bakken, A. R. Clark, H. U. Bengtsson, K. K. Kwong, D. R. Nygren, Owen Chamberlain, J. N. Marx, J. M. Hauptman, E. M. Wang, M. L. Stevenson, D. L. Fancher, N. Toge, and Hiroaki Aihara
Subjects: Quark, Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Lund string model, Elementary particle, Parton, Gluon, Nuclear physics, Pion, Quark–gluon plasma, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract: Three currently used fragmentation models are tested by studying the distribution of particles between jet axes in the 3-jet events ofe+e− annihilation, using data collected by the Time Projection Chamber at PEP. These three models — the Lund String model, the Webber Cluster model and an Independent Fragmentation model (IF) — each implement different Lorentz-frame structures for the fragmentation process of quarks and gluons into hadrons. The Lund model provides a good description of the data, while the IF model does not. The Webber model, which is untuned, does not describe the absolute particle densities between jets, but correctly predicts the ratios of those densities, which are less sensitive to the tuning.
Published: 1985

30. Characteristics of Proton Production in Jets frome+e−Annihilation at 29 GeV

Author: X. Q. Lu, W. E. Slater, W.A. Wenzel, Gilbert Shapiro, W. Gorn, M. L. Stevenson, S. C. Loken, A. R. Clark, D. H. Badtke, J. G. Layter, Peter Nemethy, B. Gabioud, C. D. Buchanan, L. Madansky, A. Barbaro-Galtieri, G. R. Lynch, C. S. Lindsey, H. Iwasaki, Owen Chamberlain, H. J. Hilke, W. M. Zhang, R. I. Koda, H. Videau, P. S. Martin, R. R. Kofler, J. Chiba, J. A. Bakken, R. M. Majka, Philippe Eberhard, A. Cordier, S. O. Melnikoff, M. T. Ronan, K. K. Kwong, C. Y. Chien, C. T. Day, Marjorie Shapiro, Mitchell Wayne, Orin I. Dahl, D. R. Nygren, G. J. VanDalen, N. Toge, K. Maruyama, Werner Hofmann, P. J. Oddone, W. Moses, R. F. van Daalen Wetters, R. W. Kenney, Hirotsugu Fujii, D. A. Park, P. R. Robrish, J. A. J. Matthews, L. T. Kerth, J. M. Hauptman, R. R. Ross, R. J. Madaras, H. K. Ticho, H. Yamamoto, D. L. Fancher, Hiroaki Aihara, J. Hylen, K. A. Derby, J. W. Gary, B. A. Barnett, F. R. Rouse, M. Yamauchi, M. Pripstein, Toshitsugu Fujii, A. D. Bross, Margaret Alston-Garnjost, Nicholas John Hadley, R. van Tyen, J. E. Huth, B. C. Shen, J. N. Marx, Barry Blumenfeld, T. Kamae, A. V. Barnes, D. H. Stork, R. R. Sauerwein, and A. Pevsner
Subjects: Physics, Particle physics, Annihilation, Proton, Meson, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Nuclear physics, Baryon, Pion, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract: Proton production in e/sup +/e/sup -/ annihilation at 29 GeV has been studied with the time projection chamber. Measurements of the dependence of proton fractions on momentum, transverse momentum with respect to the jet axis, hadron multiplicity, and event sphericity are reported. Our results are consistent with the assumption that primary baryons and mesons have similar production spectra, and indicate that protons provide more direct probes of underlying fragmentation phenomena than do pions.
Published: 1984

31. Direct Measurement of the Negative-Kaon Form Factor

Author: J. A. Poirier, T.E. Toohig, J. M. Hauptman, C. A. Rey, J. Kubic, E.N. Tsyganov, V.D. Riabtsov, E. B. Dally, T.S. Nigmanov, A.B. Watson, A.S. Vodopianov, Andrew Beretvas, P. D. Rapp, D. H. Stork, J. C. Tompkins, A. Grigorian, Z. Guzik, James T. Volk, P. F. Shepard, and A. A. Wehmann
Subjects: Nuclear physics, Physics, Scattering cross-section, Elastic scattering, Cross section (physics), Scattering, Nuclear Theory, Form factor (quantum field theory), General Physics and Astronomy, High Energy Physics::Experiment, Radius, Electron, Nuclear Experiment
Abstract: The electromagnetic form factor of the negative kaon has been measured by direct scattering of 250-GeV/c kaons from the stationary electrons of a liquid-hydrogen target The deviation of the measured elastic scattering cross section from the point cross section may be characterized by a root-mean-square kaon radius of 〈rK−2〉12=0.53±0.05 fm.
Published: 1980

32. Measurement ofτbranching ratios

Author: H. Aihara, M. Alston-Garnjost, R. E. Avery, J. A. Bakken, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H.-U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, C-Y. Chien, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, T. K. Edberg, P. H. Eberhard, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X-Q. Lu, G. R. Lynch, L. Madansky, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, A. Pevsner, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin, and W-M. Zhang
Subjects: Nuclear physics, Physics, Semileptonic decay, Particle decay, Particle physics, Muon, Pion, Meson, Branching fraction, Hadron, Lepton
Abstract: Using the data accumulated at LEP in 1989 and 1990 with the ALEPH detector, the inclusive and exclusive branching ratios of the τ lepton have been measured assuming lepton universality inZ0 decays. The inclusive branching fractions for the τ decay into one, three, and five charged particles have been determined to be (85.45±0.97)%, (14.35±0.48)%, and (0.10±0.05)%, respectively, in agreement with the world averages. New undetected decay modes are determined to have a branching fraction of less than 2.1% at 95% CL. The measured branching ratios for quasi-exclusive channels are slightly larger than, but consistent with the world averages, except for the modes τ→3 hadrons+v τ andτ→hadron+2π0v τ , which are significantly larger. These latter branching ratios have been found to be (9.5±0.7)% and (10.2±1.1)%, respectively. The sum of all the measured quasi-exclusive branching ratios is (100.4±1.8)%. A fully exclusive analysis of modes with neutral pions shows no evidence for new photonic decay modes with a branching fraction limit of 3.4% at 95% CL.
Published: 1987

33. Baryon Production ine+e−Annihilation ats=29GeV: Clusters or Diquarks?

Author: W. Moses, D. L. Fancher, S. C. Loken, M. Yamauchi, B. C. Shen, A. D. Bross, X. Q. Lu, G. R. Lynch, H. U. Bengtsson, C. Y. Chien, Werner Hofmann, J. W. Gary, Marjorie Shapiro, Owen Chamberlain, J. N. Marx, B. A. Barnett, A. Cordier, Mitchell Wayne, J. M. Hauptman, H. Yamamoto, Barry Blumenfeld, M. Pripstein, A. V. Barnes, K. Maruyama, D. H. Stork, R. R. Sauerwein, P. R. Robrish, E. M. Wang, W.A. Wenzel, H. K. Ticho, W. M. Zhang, Philippe Eberhard, F. R. Rouse, R. R. Kofler, Gilbert Shapiro, Margaret Alston-Garnjost, R. van Tyen, W. Gorn, Orin I. Dahl, D. R. Nygren, S. O. Melnikoff, J. A. J. Matthews, M. L. Stevenson, J. G. Layter, Toshitsugu Fujii, R. W. Kenney, C. T. Day, C. S. Lindsey, G. J. VanDalen, P. J. Oddone, Hirotsugu Fujii, R. R. Ross, J. Hylen, L. Madansky, D. A. Park, R. J. Madaras, Peter Nemethy, C. D. Buchanan, R. I. Koda, Nicholas John Hadley, K. A. Derby, J. A. Bakken, H. S. Kaye, M. T. Ronan, N. Toge, K. K. Kwong, H. Aihara, W. E. Slater, R. F. van Daalen Wetters, L. T. Kerth, B. Gabioud, A. Barbaro-Galtieri, A. R. Clark, J. E. Huth, T. Kamae, and A. Pevsner
Subjects: Physics, Particle physics, Annihilation, Meson, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Quark model, General Physics and Astronomy, Elementary particle, Nuclear physics, Baryon, Diquark, Pair production, High Energy Physics::Experiment, Nuclear Experiment
Abstract: We use the time-projection chamber detector to study mechanisms of baryon production in the central rapidity region of jets from e/sup +/e/sup -/ annihilation. On the basis of angular correlations between protons and antiprotons, we exclude the isotropic decay of heavy mesonic clusters as a dominant source of baryons at 95% confidence level. The diquark mechanisms used in string fragmentation models reproduce the data, provided that diquarks are formed in a two-step process which allows mesons to be produced in between the baryon and antibaryon.
Published: 1985

34. Measurement of theπ−form factor

Author: J. A. Poirier, C. A. Rey, A.S. Vodopianov, T.E. Toohig, I. Ioan, D. H. Stork, D.J. Drickey, J. C. Tompkins, E.N. Tsyganov, C. F. May, E. B. Dally, P. F. Shepard, A. A. Wehmann, R. J. Wojslaw, T.S. Nigmanov, J. M. Hauptman, and Arlene Lennox
Subjects: Nuclear physics, Physics, Particle physics, Pion, Meson, Charge radius, Scattering, Form factor (quantum field theory), High Energy Physics::Experiment, Fermilab, Electron, Event (particle physics)
Abstract: An experiment to measure the electromagnetic form factor of the negative $\ensuremath{\pi}$ meson has been carried out at Fermilab by elastically scattering 100-GeV/c pions from the atomic electrons in a liquid-hydrogen target. We find that the elastic differential scattering cross section is characterized by a root-mean-square pion charge radius of 0.56\ifmmode\pm\else\textpm\fi{}0.04 fm. This paper described our experimental design, measurement resolutions, event triggering logic, event reconstruction, experimental corrections, and form-factor results.
Published: 1981

35. Observation of scaling of the photon structure functionF2γat lowQ2

Author: T. Fujii, C. Zeitlin, B. A. Barnett, W. Vernon, Xiaochuan Lu, H. Yamamoto, S. O. Melnikoff, D. A. Bauer, J. W. Gary, G. E. Masek, J. R. Smith, D. R. Nygren, A. Lu, F. L. Linde, G. Shapiro, M. Pripstein, K. Maeshima, L. T. Kerth, K. K. Kwong, M. T. Ronan, W. E. Slater, J. J. Eastman, M. G. Strauss, R. R. Kofler, G. R. Lynch, S. J. Maxfield, P. H. Eberhard, W. M. Zhang, M. K. Sullivan, R. I. Koda, D. A. Park, W. G.J. Langeveld, M. R. Wayne, J. T. White, R. R. McNeil, Sung-Ho Park, F. R. Rouse, B. C. Shen, D. E. Pellett, W. Moses, S. C. Loken, R. W. Kenney, C. D. Buchanan, T. S. Bolognese, W.A. Wenzel, P. H.U. Bengtsson, D. H. Stork, D. O. Caldwell, J. A.J. Matthews, S. Toutounchi, K. A. Schwitkis, D. L. Bintinger, M. C.S. Williams, M. Alston-Garnjost, Z. R. Wolf, M. L. Stevenson, H. S. Kaye, L. G. Mathis, Werner Hofmann, P. Némethy, K. A. Derby, J. R. Thompson, G. J. Bobbink, T. K. Edberg, A. M. Eisner, J. E. Huth, A. R. Clark, W. Gorn, Marjorie Shapiro, A. D. Bross, Hiroaki Aihara, Winston Ko, C. S. Lindsey, J. C. Sens, G. D. Cowan, E. M. Wang, A. Barbaro-Galtieri, T. Takahashi, R. van Tyen, T. Kamae, R. E. Avery, A. Buijs, J. Hylen, J. S. Steinman, P. J. Oddone, D. A. Crane, R. R. Ross, K. H. Kees, R. J. Madaras, A. V. Barnes, Yayu Wang, F. C. Erné, H. P. Paar, E. S. Miller, B. Van Uitert, J. N. Marx, J. G. Layter, R. L. Lander, B. D. Magnuson, S. J. Yellin, W. Wagner, A. R. Barker, G. J. VanDalen, R. Enomoto, J. M. Hauptman, O. I. Dahl, N. Toge, and R. F. Van Daalen Wetters
Subjects: Physics, General Physics and Astronomy, Atomic physics, Scaling, Photon structure function
Published: 1987

36. Angular distributions of channeled pions and protons up to 250 GeV/c

Author: T.S. Nigmanov, W.M. Gibson, B.L. Chrisman, Z. Guzik, C.R. Sun, A.S. Vodopianov, D. H. Stork, M.A. Hasan, A. Kanofsky, J. Kubic, A.B. Watson, I.J. Kim, R.A. Carrigan, G. O. Williams, R. Allen, T.E. Toohig, and E.N. Tsyganov
Subjects: Azimuth, Momentum, Physics, Crystal, Nuclear and High Energy Physics, Total internal reflection, Pion, Particle, Polar, Atomic physics, Beam (structure)
Abstract: Channeling phenomena are observed for positive particles of momentum up to 250 GeV/ c in a germanium crystal. The polar angular distributions of the channeled particles are compared with theoretical predictions based on a diffusion model. The results indicate that at high particle energy there may be additional mechanisms besides those operative at low energy leading to dechanneling of the particles. In spite of this, channeling effects are observed for particles incident at up to several times the critical angle, in contrast with the results from low energy channeling. Statistical equilibrium in the azimuthal angular distribution has also been observed at all measured beam momenta to about twice the calculated channeling critical angle. The breakdown of statistical equilibrium for the 2 cm crystal used occurs at an incident angle 2–3 times smaller than predicted theoretically.
Published: 1982

37. Inclusive γ and π0 production cross sections and energy fractions ine + e − annihilation at 29 GeV

Author: J. A. Bakken, J. Hylen, Hirotsugu Fujii, D. A. Park, B. A. Barnett, R. R. Kofler, L. Madansky, R. I. Koda, R. J. Madaras, William A. Wenzel, J. W. Gary, Owen Chamberlain, S. C. Loken, M. Yamauchi, P. J. Oddone, Gilbert Shapiro, M. R. Wayne, A. R. Clark, H. Iwasaki, D. R. Nygren, J. N. Marx, H. S. Kaye, J. G. Layter, H. Yamamoto, K. A. Derby, A. Pevsner, X. Q. Lu, G. Lynch, K. K. Kwong, C. S. Lindsey, Philippe Eberhard, W. Gorn, Marjorie Shapiro, J. E. Huth, M. L. Stevenson, W. M. Zhang, H. Aihara, Margaret Alston-Garnjost, R. van Tyen, A. Cordier, J. M. Hauptman, B. C. Shen, B. Gabioud, P. Nemethy, D. L. Fancher, Orin I. Dahl, Barry Blumenfeld, C. D. Buchanan, A. D. Bross, Toshitsugu Fujii, Angela Barbaro-Galtieri, E. M. Wang, W. E. Slater, M. T. Ronan, M. Pripstein, N. Toge, D. H. Stork, L. T. Kerth, R. R. Sauerwein, K. Maruyama, Hans-Uno Bengtsson, A. V. Barnes, J. A. J. Matthews, R. F. van Daalen Wetters, W. Moses, H. K. Ticho, P. R. Robrish, G. J. Van Dalen, T. Kamae, C. Y. Chien, Werner Hofmann, Ronald R. Ross, J. Chiba, S. O. Melnikoff, F. R. Rouse, C. T. Day, Robert W. Kenney, H. Videau, and N. J. Hadley
Subjects: Physics, Particle physics, Antiparticle, Annihilation, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Nuclear physics, Massless particle, Pion, Antimatter, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Engineering (miscellaneous), Lepton
Abstract: Inclusive production cross sections for photons and π0's ine + e − annihilation at a center of mass energy of 29 GeV have been measured. The π0 production spectrum agrees with a corresponding measurement for π±. The ratio of the π0 inclusive rate to the average for π± is 0.92±0.14. The fractions of the total energy carried by photons and π0's are 0.244±0.016 and 0.217±0.033, respectively. The fraction of total energy carried by all stable hadrons, prompt leptons and photons is determined to be 0.938±0.045, leaving 0.062±0.045 for neutrinos.
Published: 1985

38. Energy losses of positive and negative high-energy channeled particles

Author: G. O. Williams, E.N. Tsyganov, I.J. Kim, A.B. Watson, T.E. Toohig, T.S. Nigmanov, B.L. Chrisman, A. S. Vodopianov, Z. Guzik, C.R. Sun, A. Kanofsky, J. Kubic, W.M. Gibson, R.A. Carrigan, R. Allen, D. H. Stork, and M.A. Hasan
Subjects: Baryon, Physics, Antiproton, Antimatter, Particle, Elementary particle, Fermion, Atomic physics, Charged particle, Ion
Abstract: The results of measurements of energy losses of 35-, 100-, and 250-GeV particles channeled through a 2-cm Ge crystal are reported. The energy losses are correlated with the incoming and outgoing particle angles, relative to the channel axis, and the results are compared with existing theories.
Published: 1983

39. Evidence for a Spin-1 Particle Produced by Two Photons

Author: H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H. -U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, P. H. Eberhard, T. K. Edberg, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X. -Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin, W. -M. Zhang, and IHEF (IoP, FNWI)
Subjects: Physics, Particle physics, Photon, Meson, General Physics and Astronomy, Resonance, Particle, High Energy Physics::Experiment, Production (computer science), Storage ring, Spin-½
Abstract: Two-photon production of ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$ states has been studied by the TPC/Two-Gamma experiment at the SLAC storage ring PEP. A resonance of mass 1.42 GeV was seen when one of the photons was quite virtual but not when both photons were nearly real. Production of a spin-1 meson, which cannot be made by two real photons, would fit these observations. The ${Q}^{2}$ dependence of the data in the resonance region agrees with this spin assignment and is incompatible with a spin-0 hypothesis. The mass and width of the resonance are similar to those of the $E$ meson, which has been assigned ${J}^{P}={0}^{\ensuremath{-}}$ and ${J}^{P}={1}^{+}$ by different experiments.
Published: 1986

40. Experimental limit on the decayτ−→ντK−K0

Author: H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H. -U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, P. H. Eberhard, T. K. Edberg, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X. -Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin, and W. -M. Zhang
Subjects: Physics, Particle physics, Tau neutrino, Electron–positron annihilation, General Physics and Astronomy, Limit (mathematics)
Published: 1987

41. Charged-Hadron Inclusive Cross Sections and Fractions ine+e−Annihilation ats=29GeV

Author: A.R. Barker, D. R. Nygren, H. Yamamoto, J. G. Layter, G. E. Masek, J. M. Hauptman, S. J. Yellin, W. Moses, F. C. Erné, A. M. Eisner, F. R. Rouse, J. C. Sens, Z. R. Wolf, W. Vernon, M. Pripstein, S. Khacheryan, D. O. Caldwell, S. J. Maxfield, M. K. Sullivan, D. H. Stork, W. G.J. Langeveld, G. Cowan, J. R. Smith, Philippe Eberhard, R. R. Kofler, R. W. Kenney, B. C. Shen, A. Barbaro-Galtieri, Orin I. Dahl, D.A. Bauer, A. Lu, S. Toutounchi, Wolfgang Wagner, D. A. Crane, S. K. Park, J. Hylen, J. A. J. Matthews, T. K. Edberg, D. E. Pellett, F.L. Linde, B. D. Magnuson, A. R. Clark, G. J. Bobbink, H. P. Paar, J. S. Steinman, C. D. Buchanan, G. R. Lynch, H. Y. Chao, W.A. Wenzel, M. G. Strauss, T. Kamae, S. C. Loken, Gilbert Shapiro, Werner Hofmann, K. A. Derby, A. Bay, Y. X. Wang, Tadayuki Takahashi, M. L. Stevenson, P. J. Oddone, E. M. Wang, R. R. Ross, R. J. Madaras, Margaret Alston-Garnjost, R. van Tyen, H. S. Kaye, M. T. Ronan, K. H. Fairfield, H. Aihara, Ryoji Enomoto, E. S. Miller, K. A. Schwitkis, A. Buijs, R.E. Avery, J. J. Eastman, M. Daoudi, B. A. Barnett, L. Mathis, W. T. Lin, S. B. Chun, C. Zeitlin, and R. W. Stephens
Subjects: Nuclear physics, Physics, Particle physics, Annihilation, Hadron, General Physics and Astronomy
Published: 1988

42. Modulation of nuclear interactions using channeling at multi-hundred GeV energies

Author: Ick-Joh Kim, T.E. Toohig, C.R. Sun, A.S. Vodopianov, T.S. Nigmanov, A.B. Watson, R.A. Carrigan, E.N. Tsyganov, A. Kanofsky, J. Kubic, B.L. Chrisman, Z. Guzik, R. Allen, D. H. Stork, M.A. Hasan, and W.M. Gibson
Subjects: Physics, Nuclear and High Energy Physics, Energy loss, Scattering, Nuclear Theory, chemistry.chemical_element, Germanium, Nuclear physics, Pion, chemistry, Modulation, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Single crystal, Beam (structure)
Abstract: Channeling of protons and positive and negative pions has been observed in a single crystal of germanium at beam momenta of 35, 100 and 250 GeV/c. Both energy loss and scattering have been measured. The channeling effects agree with observations at lower energies suitably scaled to these high energies. The suppression of inelastic nuclear interactions has been directly observed by monitoring multiple-track events.
Published: 1980

43. Measurement of Ionization Loss in the Relativistic Rise Region with the Time Projection Chamber

Author: L. Madansky, W. E. Slater, W. Gorn, C.Y. Chien, J. A. Bakken, B. Gabioud, M. T. Ronan, A. V. Barnes, J. M. Hauptman, J. A. J. Matthews, R. I. Koda, M. Urban, H. Hilke, C. D. Buchanan, K. K. Kwong, R. van Tyen, J. G. Layter, B. A. Barnett, W-M. Zhang, P. R. Robrish, S. C. Loken, W. C. Carithers, R. F. vanDaalen Wetters, J. Mallet, M. Yamauchi, P. S. Martin, Hiroaki Aihara, H. Fujii, P. H. Eberhard, K. A. Derby, K. Maruyama, T. Fujii, R. R. Kofler, T. Kamae, A. D. Bross, G. Shapiro, Ronald Madaras, M. L. Stevenson, M. D. Shapiro, Bernard Gabioud, G. R. Lynch, X-Q. Lu, B. Heck, J. E. Huth, J. Chiba, D. A. Park, O. Chamberlain, N. Toge, C. T. Day, M. Alston-Garnjost, H. K. Ticho, D. L. Fancher, R. R. Ross, J. W. Gary, F. R. Rouse, W. Moses, M. Pripstein, J. N. Marx, D. H. Stork, S. O. Melnikoff, P. J. Oddone, D. R. Nygren, J. Hylen, P. Nemethy, L. T. Kerth, R. Majka, H. Iwasaki, A. Pevsner, Barry Blumenfeld, H. Videau, N. J. Hadley, G. J. Van Dalen, A. Barbaro-Galtieri, O. I. Dahl, M. E. Zeller, A. R. Clark, Mitchell Wayne, D. H. Badtke, R. W. Kenney, W. A. Wenzel, C. S. Lindsey, P. Delpierre, and B. C. Shen
Subjects: Physics, Nuclear and High Energy Physics, Time projection chamber, Astrophysics::High Energy Astrophysical Phenomena, Resolution (electron density), Cosmic ray, Particle identification, Standard deviation, Cathode, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, Ionization, Calibration, High Energy Physics::Experiment, Electrical and Electronic Engineering
Abstract: We present here some results obtained with the LBL Time Projection Chamber (TPC) regarding the particle identification by the measurement of the ionization losses in the relativistic rise region. This includes the method of calibration using 55Fe sources, the measurement of the resolution using cosmic rays, which shows an equivalent K-? separation of 4.8 standard deviations at 3.5 GeV/c, and the preliminary results obtained with multihadronic events from e+e- annihilations.
Published: 1983

44. Charge conjugation invariance in η′ (958)→π+π−γ

Author: F.D. Rudnick, A. Ladage, D. H. Stork, A. Grigorian, D.I. Sober, D.J. Mellema, and H.K. Ticho
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Meson, media_common.quotation_subject, Hadron, Charge (physics), Asymmetry, Nuclear physics, Momentum, Particle decay, Pion, High Energy Physics::Experiment, Nuclear Experiment, media_common
Abstract: The charge asymmetry in the decay η′(958)→π+π−γ has been measured using η′ mesons produced in the reaction π−p→η′n at 2.1 GeV/c incident pion momentum. A value for the asymmetry of (−6.9±7.8%) was obtained, based on 295±31 events after background subtraction. This result is consistent with C invariance in this decay.
Published: 1975

45. Experimental limit onι→γγand the interpretation of the iota as a glueball

Author: H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H.-U. Bengtsson, D. L. Bintinger, B. J. Blumenfeld, G. J. Bobbink, A. D. Bross, C. D. Buchanan, A. Buijs, M. P. Cain, D. O. Caldwell, O. Chamberlain, C.-Y. Chien, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, P. H. Eberhard, A. M. Eisner, R. Enomoto, F. C. Erne, T. Fujii, B. Gabioud, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, U. P. Joshi, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X-Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, K. Maruyama, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, R. R. Sauerwein, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, M. Yamauchi, S. J. Yellin, C. Zeitlin, and W.-M. Zhang
Subjects: Physics, Nuclear physics, Iota, Particle physics, Pion, Pair production, Meson, Glueball, Branching fraction, Hadron, General Physics and Astronomy, Spectral line
Abstract: By observing the reaction ..gamma gamma -->..K-italic/sub s-italic//sup 0/K/sup +-/..pi../sup minus-or-plus/, the TPC/Two-Gamma experiment at the SLAC e-italic/sup +/e/sup -/ storage ring PEP has obtained a 95%-confidence-level limit of GAMMA/sub iota//sub ..-->..//sub ..gamma..//sub ..gamma../B(iota..-->..KK-bar..pi..) ..//sub ..gamma..//sub ..gamma../ limit appears to conflict with previous assignments of an observed rho..gamma.. decay to iota and also with many analyses of eta-eta'-iota mixing. The contrast of this small ..gamma gamma.. width with the large rate for J-italic/psi..--> gamma..iota is evidence that the iota is a glueball with little admixture of q-italicq-bar states.
Published: 1986

46. Direct Measurement of theπ−Form Factor

Author: Arlene Lennox, I. Ioan, D.J. Drickey, C. A. Rey, P. F. Shepard, A. S. Vodopianov, J. M. Hauptman, E. B. Dally, J. A. Poirier, T.S. Nigmanov, C. F. May, D. H. Stork, T.E. Toohig, E.N. Tsyganov, R. J. Wojslaw, A. A. Wehmann, and J. C. Tompkins
Subjects: Physics, Elastic scattering, Antiparticle, Particle physics, Meson, Hadron, Form factor (quantum field theory), General Physics and Astronomy, Elementary particle, Pion, Charge radius, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment
Abstract: We have measured the electromagnetic form factor of the charged pion by direct scattering of 100-GeV/c ${\ensuremath{\pi}}^{\ensuremath{-}}$ from stationary electrons in a liquid-hydrogen target at Fermilab. The deviations from the pointlike pion-scattering cross section may be characterized by a root-mean-square charge radius for the pion of ${〈{{\mathcal{r}}_{\ensuremath{\pi}}}^{2}〉}^{\frac{1}{2}}=0.56\ifmmode\pm\else\textpm\fi{}0.04$ F.
Published: 1977

47. Charged Hadron Production ine+e−Annihilation at 29 GeV

Author: H. Aihara, M. Alston-Garnjost, D. H. Badke, J. A. Bakken, A. Barbaro-Galtieri, A. V. Barnes, B. A. Barnett, B. J. Blumenfeld, A. D. Bross, C. D. Buchanan, O. Chamberlain, C. Chen, J. Chiba, C. -Y. Chien, A. R. Clark, O. I. Dahl, C. T. Day, P. Delpierre, K. A. Derby, P. H. Eberhard, D. L. Fancher, H. Fujii, T. Fujii, B. Gabioud, J. W. Gary, W. Gorn, W. Gu, N. J. Hadley, J. M. Hauptman, H. J. Hilke, W. Hofmann, J. E. Huth, J. Hylen, H. Iwasaki, T. Kamae, R. W. Kenney, L. T. Kerth, R. I. Koda, R. R. Kofler, K. K. Kwong, J. G. Layter, C. S. Lindsey, S. C. Loken, G. W. London, X. -Q. Lu, G. R. Lynch, L. Madansky, R. J. Madaras, R. Majka, J. Mallet, P. S. Martin, K. Maruyama, J. N. Marx, J. A. Matthews, S. O. Melnikoff, W. Moses, P. Nemethy, D. R. Nygren, P. J. Oddone, D. A. Park, A. Pevsner, M. Pripstein, P. R. Robrish, M. T. Ronan, R. R. Ross, F. R. Rouse, R. R. Sauerwein, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, M. L. Stevenson, D. H. Stork, H. K. Ticho, N. Toge, M. Urban, R. F. van Daalen Wetters, G. J. VanDalen, R. van Tyen, H. Videau, M. R. Wayne, W. A. Wenzel, H. A. Yamamoto, M. Yamauchi, M. E. Zeller, and W. -M. Zhang
Subjects: Nuclear physics, Baryon, Physics, Particle physics, Annihilation, Time projection chamber, Meson, Electron–positron annihilation, General Physics and Astronomy, High Energy Physics::Experiment, Charged particle, Particle identification, Hadronization
Abstract: Data from the Time Projection Chamber at the SLAC storage ring PEP have been used to study the inclusive production of charged hadrons. Particles were identified by simultaneous dE/dx and momentum measurements. Cross sections and particle fractions for pi +/-, k+/-, and p(anti-p) are given as a function of several variables. Predictions of various hadronization models are compared to the data. A comparison is made with other fragmentation processes.
Published: 1984

48. Study ofη’formation in photon-photon collisions

Author: H. Aihara, M. Alston-Garnjost, R. E. Avery, A. Barbaro-Galtieri, A. R. Barker, A. V. Barnes, B. A. Barnett, D. A. Bauer, H. -U. Bengtsson, D. L. Bintinger, G. J. Bobbink, T. S. Bolognese, A. D. Bross, C. D. Buchanan, A. Buijs, D. O. Caldwell, A. R. Clark, G. D. Cowan, D. A. Crane, O. I. Dahl, K. A. Derby, J. J. Eastman, P. H. Eberhard, T. K. Edberg, A. M. Eisner, R. Enomoto, F. C. Erné, T. Fujii, J. W. Gary, W. Gorn, J. M. Hauptman, W. Hofmann, J. E. Huth, J. Hylen, T. Kamae, H. S. Kaye, K. H. Kees, R. W. Kenney, L. T. Kerth, Winston Ko, R. I. Koda, R. R. Kofler, K. K. Kwong, R. L. Lander, W. G. J. Langeveld, J. G. Layter, F. L. Linde, C. S. Lindsey, S. C. Loken, A. Lu, X-Q. Lu, G. R. Lynch, R. J. Madaras, K. Maeshima, B. D. Magnuson, J. N. Marx, G. E. Masek, L. G. Mathis, J. A. J. Matthews, S. J. Maxfield, S. O. Melnikoff, E. S. Miller, W. Moses, R. R. McNeil, P. Nemethy, D. R. Nygren, P. J. Oddone, H. P. Paar, D. A. Park, S. K. Park, D. E. Pellett, M. Pripstein, M. T. Ronan, R. R. Ross, F. R. Rouse, K. A. Schwitkis, J. C. Sens, G. Shapiro, M. D. Shapiro, B. C. Shen, W. E. Slater, J. R. Smith, J. S. Steinman, M. L. Stevenson, D. H. Stork, M. G. Strauss, M. K. Sullivan, T. Takahashi, J. R. Thompson, N. Toge, S. Toutounchi, R. van Tyen, B. van Uitert, G. J. VanDalen, R. F. van Daalen Wetters, W. Vernon, W. Wagner, E. M. Wang, Y. X. Wang, M. R. Wayne, W. A. Wenzel, J. T. White, M. C. S. Williams, Z. R. Wolf, H. Yamamoto, S. J. Yellin, C. Zeitlin, and W-M. Zhang
Subjects: Physics, Nuclear physics, Particle physics, Photon, Prime (order theory)
Published: 1987

49. Study of Bose-Einstein correlations ine+e−annihilation at 29 GeV

Author: H. K. Ticho, L. T. Kerth, Em Wang, D. R. Nygren, G. R. Lynch, W. A. Wenzel, W. E. Slater, A. R. Clark, X. Q. Lu, M. Yamauchi, F. R. Rouse, L. Madansky, M. L. Stevenson, N. Toge, A. D. Bross, R. W. Kenney, J. Hylen, W. M. Zhang, D. L. Fancher, J. M. Hauptman, C. Y. Chien, R. I. Koda, M. Pripstein, S. C. Loken, K. Maruyama, R. R. Kofler, A. Cordier, M. Alston-Garnjost, C. S. Lindsey, M. D. Shapiro, R. F. van Daalen Wetters, Hirotsugu Fujii, O. Chamberlain, K. A. Derby, H. Yamamoto, M. R. Wayne, A. V. Barnes, R. R. Sauerwein, M. T. Ronan, R. van Tyen, A. Pevsner, B. A. Barnett, G. J. Vandalen, W. Gorn, S. O. Melnikoff, A. Barbaro-Galtieri, R. J. Madaras, J. N. Marx, K. K. Kwong, T. Fujii, B. J. Blumenfeld, J. G. Layter, W. Moses, H. S. Kaye, O. I. Dahl, Tuneyoshi Kamae, H. U. Bengtsson, Hiroaki Aihara, C. D. Buchanan, C. T. Day, J. E. Huth, W. Hofmann, R. R. Ross, P. J. Oddone, D. H. Stork, B. Gabioud, D. A. Park, G. Shapiro, J. A. Bakken, P. H. Eberhard, J. W. Gary, B. C. Shen, P. R. Robrish, N. J. Hadley, Peter Nemethy, and J. A J Matthews
Subjects: Physics, Particle physics, Time projection chamber, Annihilation, Meson, Hadron, Bose–Einstein correlations, Nuclear physics, symbols.namesake, Pion, Pair production, Bose–Einstein statistics, symbols, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Bose-Einstein correlations between like-sign pions have been investigated in e/sup +/e/sup -/ annihilation at ..sqrt..s = 29 GeV using the Time Projection Chamber detector at the SLAC e/sup +/e/sup -/ storage ring PEP. The production rate of like-sign pion pairs with small relative momentum is found to be increased by more than 50% over the rate expected for uncorrelated production of pions. From the correlation length, a typical source radius of 0.65 fm is derived. Data are consistent with a spherical shape of the pion source. No dependence of radius or correlation strength on the event multiplicity is observed.
Published: 1985

50. Search for Charge-43eParticles Produced ine+e−Annihilations

Author: M. Urban, A. V. Barnes, Hirotsugu Fujii, D. A. Park, W. E. Slater, P. R. Robrish, D. H. Stork, R. R. Sauerwein, B. A. Barnett, B. C. Shen, S. O. Melnikoff, W. Gorn, K. A. Derby, J. G. Layter, Peter Nemethy, R. W. Kenney, P. Delpierre, M. E. Zeller, J. A. J. Matthews, A. Barbaro-Galtieri, J. N. Marx, J. Hylen, W. M. Zhang, Barry Blumenfeld, M. T. Ronan, R. R. Kofler, G. R. Lynch, C. D. Buchanan, Mitchell Wayne, W. X. Gu, J. A. Bakken, K. K. Kwong, H. J. Hilke, H. Aihara, Orin I. Dahl, M. Pripstein, K. Maruyama, C. Y. Chien, G. W. London, X. Q. Lu, W.A. Wenzel, Gilbert Shapiro, C. Q. Chen, Werner Hofmann, H. K. Ticho, M. L. Stevenson, R. M. Majka, J. E. Huth, P. J. Oddone, C. T. Day, D. R. Nygren, M. Yamauchi, R. R. Ross, J. M. Hauptman, J. Mallet, R. J. Madaras, T. Kamae, Toshitsugu Fujii, A. D. Bross, Nicholas John Hadley, A. Pevsner, Margaret Alston-Garnjost, R. van Tyen, Owen Chamberlain, D. L. Fancher, G. J. Van Dalen, J. Chiba, W. Moses, N. Toge, J. W. Gary, C. S. Lindsey, L. Madansky, R. I. Koda, H. Videau, Marjorie Shapiro, F. R. Rouse, R. F. van Daalen Wetters, L. T. Kerth, A. R. Clark, D. H. Badtke, William Carithers, B. Gabioud, P. S. Martin, H. Iwasaki, Philippe Eberhard, and S. C. Loken
Subjects: Nuclear physics, Physics, General Physics and Astronomy, Charge (physics)
Published: 1984

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