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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
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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
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3. 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
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4. 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
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5. 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
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6. 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
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7. 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
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8. 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
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9. 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
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10. Baryon exchange in 12 GeV/c π−p interactions

Author

J. M. Hauptman, H.K. Ticho, D. H. Stork, W. Bacino, M.W. Arenton, F.D. Rudnick, P.F. Shepard, and W. E. Slater

Subjects
Baryon, Nuclear physics, Momentum, Scattering cross-section, Physics, Nuclear and High Energy Physics, Expansion rate, Meson, Mass spectrum, Neutron, Calorimeter
Abstract

Final states produced by charged baryon exchange in π−p interactions at 12 GeV/c laboratory momentum have been studied. Forward neutrons with momenta determined by a calorimeter to be greater than 8.5 ± 1.4 GeV/c triggered the SLAC 40-inch hydrogen bubble chamber which operated at a 10 Hz expansion rate. We report data on the reactions π−p→nπ−π+, π−p→nπ−π+π0, and π−p→nπ−π−π+π+. In π−nπ−p→nπ+, production of ϱ and f mesons is observed. Differential cross sections are derived and compared with data at lower incident momentum and with theoretical models. In π−p→nπ−π+π0, ω production is observed with a differential cross section having a deep near u′= 0.2 (GeV/c)2. In π−p→nπ−π−π+π+, Δ−, ϱ and f production is observed . The observed mass distributions appear to indicate the production of wide resonaces decaying into ϱππ. Some evidence for ϱ-ω interference is also observed.

Published
1978
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11. Multi-peripheralism in and K+p → ΛK+K+ at 7.3 GeV/c

Author

D. H. Stork, D.J. Mellema, C.-Y. Chien, H.K. Ticho, and W. E. Slater

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Phenomenology (particle physics)
Abstract

Data are presented for the reactions K+p → Λpp and K+p → ΛK+K+ at 7.3 GeV/c. A satisfactory parameterization of these processes is obtained using the double-Regge phenomenology. The data are also compared with predictions of a spin-independent, generalized Veneziano model.

Published
1971
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12. production in 7.3 GeV/c K+p interactions

Author

D.Joel Mellema, P.M. Dauber, P.A. Schreiner, C.-Y. Chien, D. H. Stork, W. E. Slater, and H.K. Ticho

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Pion, Angular distribution, Production (computer science), Neutron
Abstract

Reactions involving Λ and Σ 0 production are studied in 7.3 GeV/c K+p interactions. Cross sections and angular distributions are given.

Published
1967
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13. A measurement of the form factors for the decay KLo → πμν

Author

D.J. Drickey, D. H. Stork, C. D. Buchanan, E. Seppi, L. Ettlinger, P.F. Shepard, P. Innocenti, F.D. Rudnick, L. Resvanis, C. Y. Chien, H.K. Ticho, B. Cox, E. Dally, and R. Zdanis

Subjects
Physics, Nuclear and High Energy Physics, Muon, Pion, Strong coupling, Form factor (quantum field theory), Neutrino, Atomic physics
Abstract

The decay process KLo → πμν has been studied in a wire chamber experiment using the three-degree KLo beam at SLAC. A sample of 26 500 Kμ3 events have been identified to obtain information on the form factors ƒ ± associated with the V-A hypothesis for this decay. Expressing the energy dependence of the form factors as ƒ ± = ƒ ± (0) (1 + λ ± q 2 m 2 ), where q 2 = (p K −p μ ) 2 , the experiment yields the value λ+ = 0.08 ± 0.01 and reveals a strong coupling between λ_ and ζ_(0) = ƒ_(0) ƒ + (0) .

Published
1970
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14. Coherent regeneration in hydrogen from 3 to 10 GeV/c

Author

C. D. Buchanan, H.K. Ticho, E. Dally, L. Resvanis, D.J. Drickey, E. Seppi, B. Cox, D. H. Stork, F.D. Rudnick, L. Ettlinger, R. Zdanis, C. Y. Chien, P. Innocenti, and P.F. Shepard

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Spectrometer, Hydrogen, chemistry, chemistry.chemical_element, Atomic physics, Spark chamber, Beam (structure), Liquid hydrogen
Abstract

We have studied the proper time distribution of coherent π+π− decays from a 3 – 10 GeV/c KLo beam incident on a one meter liquid hydrogen target using a wire spark chamber spectrometer in the 30 neutral beam at SLAC. We find ∣(ƒ(0) − ƒ (0))/k∣ = 0.43 ± 0.11 mb , φ(ƒ(0) − ƒ (0)) = -101 0 ± 42 0 .

Published
1971
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15. Y0∗ (1520) mass, width and decay fractions

Author

E.I. Malamud, P.M. Dauber, D. H. Stork, W. E. Slater, and P.E. Schlein

Subjects
Momentum, Physics, Nuclear physics, Nuclear and High Energy Physics, Pion, Hyperon, Resonance, Atomic physics
Abstract

The decay fractions of the Y 0 ∗ (1520) have been measured using the reaction K − p → Y 0 ∗ (1520) π + π − at 2.0 GeV/ c incident momentum. They are K N : Σπ: Λππ = (52 ± 4):(37 ± 4):(11 ± 2) . The best values for the mass and width are 1518.0 ± 0.7 MeV and 16 ± 2 MeV.

Published
1967
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16. Spin and parity of the K ππ system near 1.3 GeV

Author

W. E. Slater, T.G. Trippe, P.A. Schreiner, C.-Y. Chien, D.J. Mellema, P.M. Dauber, H.K. Ticho, P.E. Schlein, D. H. Stork, and E.I. Malamud

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Effective mass (solid-state physics), Pion, Meson, Quantum electrodynamics, Dalitz plot, Parity (physics), Elementary particle
Abstract

The Kππ Dalitz plots for the two reactions K + p→K♂π + p at 7.38 GeV/ c beam momentum in the effective mass interval 1.2 M Kππ ∗++ (1.13 M π + p J P = 1 + to the Kππ system, are supported by the observed correlations of the outgoing K and K ∗ with the incident K + .

Published
1968
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17. Evidence for a broad scalar Kπ resonance near 1.1 GeV

Author

H.K. Ticho, J. Mellema, D. H. Stork, E.I. Malamud, W. E. Slater, P.E. Schlein, C.-Y. Chien, and T.G. Tripple

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Angular distribution, Pion, Meson, Scalar (mathematics), High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Delta baryon
Abstract

A one-pion-exchange pole-extrapolation analysis of K + p→K πΔ ++ at 7.3 GeV/ c provides evidence for the existence of a broad scalar T = 1 2 K π resonance near 1.1GeV. The angular distribution in the Kπ center-of-mass is consistent with this result.

Published
1968
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18. The reaction K−P → ΛK+K− and the generalized Veneziano model

Author

R.T. Ross, A.G. Clark, P.A. Schreiner, D. H. Stork, and Louis Lyons

Subjects
Scattering amplitude, Pseudoscalar, Momentum, Physics, Quark, Nuclear and High Energy Physics, Pomeron, Quantum mechanics, Quark model, Duality (optimization), Symmetry (physics), Mathematical physics
Abstract

New data for the reaction K−p → ΛK+K− at 3.3 GeV/c have been used to investigate the five-particle generalized Veneziano model. The amplitude is constrained by symmetry properties of the crossed channels and by non-exchange degeneracy of the Nα∗ trajectory. The Harari-Rosner dual quark model determines the trajectories which couple to the K+K− system. Reasonable choices for the other trajectories lead to good agreement with these data as well as data at higher and lower beam momentum. The pomeron exchange contribution to the reaction is shown to be small; however, both pseudoscalar and vector kinematic factors are required for detailed agreement with the angular distributions. The model fails to account for the crossing-symmetric reaction K+p → ΛK+K+.

Published
1971
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19. K+p elastic scattering at 7.3 GeV/c

Author

D.J. Mellema, C.-Y. Chien, E.I. Malamud, W. E. Slater, D. H. Stork, H.K. Ticho, and P.E. Schlein

Subjects
Physics, Nuclear physics, Elastic scattering, Nuclear and High Energy Physics, Cross section (physics), Amplitude, Forward scatter
Abstract

A study of K+p elastic scattering at 7.3 GeV/c has yielded a cross section of 3.86 ± 0.38 mb. For events produced in the forward direction, a diffractive peak is observed which fits the distribution (dσ/dt) = (dσ/dt)0exp (αt + βt2) with (dσ/dt)0 = (20.6 + 2.6) mb/(GeV/c2, α = (5.46 ±_0.29)(GeV/c)-2 an β = (0.38 ± 0.25)(GeV/c)-4. The ratio |Re ƒ(0)/Im ƒ (0)| for the forward scattering amplitude is 0.60 ± 0.14. One elastic scatter was found in the backward direction.

Published
1969
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20. A measurement of the form factor from K0e3 decays

Author

H.K. Ticho, L. Ettlinger, L. Resvanis, F.D. Rudnick, E. Dally, P. Innocenti, R. Zdanis, C. Y. Chien, C. D. Buchanan, B. Cox, D. H. Stork, E. Sappi, D.K. Drickey, and P.F. Shepard

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Wire chamber, Muon, Spectrometer, Electron, Neutrino, Linear particle accelerator
Abstract

A sample of 17 000 K0L → πev decays were measured at the Stanford Linear Accelerator Center using a wire chamber magnetic spectrometer. K0e3 decays were separated from other K0L decay modes by using kinematic tests, muon identification by penetration of a Pb wall and electron identification by a shower counter array. We find the data in fixed q2 bands are in reasonable agreement with the V-A theory and we present the unparametrized form factor ƒ + (q 2 ) . Using the usual linear parametrization ƒ + (q 2 ) ∼ 1 + λ + q 2 /m π 2 , we obtained λ+ = 0.05 ± 0.01.

Published
1971
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21. A study of the strong interaction form factors for KoL → πμν and KoL → πeν

Author

D. H. Stork, P. F. Shepard, R. Zdanis, B. Cox, P. G. Innocenti, L. Ettlinger, F.D. Rudnick, E. Seppi, L. Resvanis, C. Y. Chien, C. D. Buchanan, E. B. Dally, D.J. Drickey, and H.K. Ticho

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Strong interaction, Dalitz plot
Abstract

We have extracted the strong interaction form factors from K o e3 and K o μ3 data of our previously reported K o L experiment in a manner which does not assume an explicit q 2 = ( p K − p π ) 2 dependence. We present the unparameterized form factors ƒ + (q 2 ) from the K o L → πeν and K o L → πμν modes and ƒ o (q 2 ) and ξ ( q 2 ) from the K o L → πμν data. A comparison of these unparameterized results is made with the results of the Dalitz plot analyses.

Published
1972
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22. Experimental evidence against a non-strongly interacting CP-even KL0 component

Author

E. Seppi, P.F. Shepard, L. Ettlinger, D.J. Drickey, C. D. Buchanan, P. G. Innocenti, B. Cox, E. Dally, F.D. Rudnick, C. Y. Chien, D. Berk, L. Resvanis, R. A. Zdanis, H.K. Ticho, D. H. Stork, and A. Grigorian

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Pion, Invariance principle, Component (thermodynamics), Absorption (chemistry), Atomic physics, Constant (mathematics), Beam (structure)
Abstract

We have measured the rate for K L 0 → π + π − as a function of the thickness of lead absorber placed in a K L 0 beam at SLAC. Measurements were made with 12″, 18″ and 24″ of lead. Our results, which are relatively constant, are in strong disagreement with models which ascribe this decay mode to an additional neutral kaon state which is CP even, does not interact strongly, but otherwise has properties similar to the K 2 0 state.

Published
1970
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