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1. The reactionspp→ppπ+π-,K + p→K + pπ +π−π, π+ p→ π+,pπ+π− and π− p →π+π− at 147 GeV/c

Author

P. E. Stamer, Sergio P Ratti, A. M. Shapiro, Fernand Grard, H. O. Cohn, V. Kistiakowsky, Shlomo Dado, C. Castoldi, Yong-Shi Wu, S. H. Oh, H. de Bock, G. Bressi, E. D. AlyeaJr., L. Bachman, P. Lucas, E. S. Hafen, C. Pols, V. Henri, L. Berny, W. J. Metzger, D. Huang, R. T. Van de Walle, R. Windmolders, P. C. Trepagnier, D. H. Brick, T. B. Stoughton, P. Lutz, R. Yaari, B. M. Whyman, P. Herquet, Gideon Alexander, P.F. Jacques, A. Shapira, S. Noguchi, H. A. Rubin, T. L. Watts, J. Goldberg, J. T. Bober, E. B. Brucker, M. Widgoff, J. Grunhaus, Richard E. Ansorge, R. Dimarco, E. Calligarich, V. Suchorebrow, M. Kalelkar, F. Crijns, Aharon Levy, S. Taylor, A. H. Rogers, S. Toaff, E.E. Ronat, R. K. Yamamoto, R. Steiner, D. Hochman, R. I. Hulsizer, Odette Benary, C. Y. Chien, H. Rudnicka, T. Ludlam, E. L. Hart, D. R. Ward, J. Hanton, I. A. Pless, S. Tether, R.A. Burnstein, M. Schouten, A. Pevsner, R. Dolfini, E. L. Koller, R. Heifetz, P. Haridas, Y. Eisenberg, W. M. Bugg, T. Handler, G. T. Condo, W. Kittel, P. Pilette, U. Karshon, G. Yekutieli, H. D. Taft, R.J. Plano, J. M. Lesceux, W.W. Neale, and T. A. J. Frank

Subjects
Nuclear physics, Mass enhancement, Physics, Diffraction, Pomeron, Physics and Astronomy (miscellaneous), Elementary particle, Fermilab, Atomic physics, Engineering (miscellaneous)
Abstract

We have studied the reactionspp→ppπ+π-,K+p→K+pπ+π−π, π+p→ π+,pπ+π− and π−p →π+π− at 147 GeV/c using the 30-inch Fermilab hybrid system. All four reactions were detected with the same apparatus and analyzed in the same way. The energy dependence of the channel cross section was found to beAp−0.6+B for thepp reaction andAp−1+B for the other three. About 90% of the cross section at 147 GeV/c can be accounted for by either beam or target diffraction. Some of the remaining cross section may come from double Pomeron exchange reactions which we tried to isolate. We have tested the hypothesis of a factorizable Pomeron and our data indicates a violation of this hypothesis. We show that the 3π mass enhancement in the mass region 1.2–1.4 GeV is diffractively produced in the π± beam reactions. Fourprong, four-constraint and six-prong, four-constraint cross sections are reported.

Published
1983
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2. Inclusive strange-resonance production inpp,π+p, andK+pinteractions at 147 GeV/c

Author

Sergio P Ratti, G. Yekutieli, Fernand Grard, E.D. Alyea, T. L. Watts, H. D. Taft, V. Kistiakowsky, Shlomo Dado, J. W. Cooper, Aharon Levy, G. T. Condo, H. O. Cohn, A. Pevsner, P. C. Trepagnier, F. Carminati, J. Grunhaus, P.F. Jacques, E.E. Ronat, R. Dimarco, D. H. Brick, E. B. Brucker, Y. Eisenberg, R.J. Plano, R. Windmolders, W. Kittel, C. Castoldi, B. M. Whyman, W. M. Bugg, P. E. Stamer, D. Hochman, W. J. Metzger, T. Handler, U. Karshon, P. Lutz, M. Schouten, Gideon Alexander, H. A. Rubin, M. Kalelkar, A. M. Shapiro, M. Widgoff, W.W. Neale, Richard E. Ansorge, L. Berny, R. T. Van de Walle, Odette Benary, E. L. Koller, R.A. Burnstein, F. Crijns, R. Yaari, E. L. Hart, A. Shapira, A. Napier, S. Taylor, D. R. Ward, C. Y. Chien, H. Rudnicka, G. Bressi, J. P. Silverman, T. Ludlam, E. S. Hafen, S. Toaff, J. Goldberg, J. E. Brau, E. Calligarich, J. Hanton, R. Dolfini, V. Henri, L. Bachman, I. A. Pless, C. Pols, R. K. Yamamoto, R.D. Sard, H. Debock, J. R. Carter, R. I. Hulsizer, John Gordon Rushbrooke, J. Tortora, D. Ljung, J. M. Lesceux, R. L. Plumer, and P. Herquet

Subjects
Physics, Nuclear physics, Quark model, Pi, Fermilab, Hydrogen bubble, Lambda, Central region
Abstract

We have studied the inclusive production of K/sup asteriskplus-or-minus/(890) and Y/sup asteriskplus-or-minus/(1385) in pp, ..pi../sup +/p, and K/sup +/p interactions at 147 GeV/c. The experiment used the Fermilab 30-inch hydrogen bubble chamber with the hybrid spectrometer system. Results are based on a sample of 1916 observed K/sub S/ and 932 observed ..lambda... Inclusive cross sections are given for K/sup asteriskplus-or-minus/ and Y/sup asteriskplus-or-minus/ production from the three beams, and comparisons are made with experiments at other energies. Feynman-x and transverse-momentum-squared distributions are also calculated. The results suggest that the K/sup asterisk-/ is entirely produced in the central region, while the K/sup asterisk+/ includes a component from beam fragmentation. Comparisons are made with the additive quark model.

Published
1982
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3. Topological, total, and elastic cross sections forK+p,π+p, andppinteractions at 147 GeV/c

Author

S. Toaff, W. J. Metzger, P. Lutz, Y. Eisenberg, R.A. Burnstein, J. Hanton, P. C. Trepagnier, S. H. Oh, W. M. Bugg, R. Dolfini, E. Hafen, T. B. Stoughton, V. Suchorebrow, B. M. Whyman, T. L. Watts, M. Kalelkar, I. A. Pless, J. Grunhaus, W. Kittel, D. H. Brick, A. Pevsner, V. Kistiakowsky, S. Noguchi, Yang Wu, V. Henri, Shlomo Dado, E. B. Brucker, T. Handler, R. Dimarco, R. Steiner, J. T. Bober, G. Bressi, Sergio P Ratti, Odette Benary, G. Yekutieli, F. Crijns, E.D. Alyea, R. Heifetz, P. Herquet, Fernand Grard, S. Taylor, R. I. Hulsizer, U. Karshon, W.W. Neale, E. L. Koller, H. D. Taft, P. W. Lucas, G. T. Condo, S. Tether, P. Haridas, H. Rudnicka, P. Pilette, R. K. Yamamoto, R. Yaari, C. Y. Chien, A. Shapira, A. H. Rogers, T. Ludlam, C. Castoldi, R.J. Plano, L. Berny, R. T. Van de Walle, M. Schouten, J. Goldberg, P.F. Jacques, E.E. Ronat, E. Calligarich, R. Windmolders, E. L. Hart, D. R. Ward, H. O. Cohn, P. E. Stamer, A. M. Shapiro, D. Hochman, D. Huang, T. A. J. Frank, M. Widgoff, Richard E. Ansorge, Gideon Alexander, H. A. Rubin, Aharon Levy, J. M. Lesceux, L. Bachman, C. Pols, and H. Debock

Subjects
Physics, Nuclear physics, Elastic scattering, Pi, Analytical chemistry, Particle detector, Beam (structure)
Abstract

The Fermilab hybrid 30-in. bubble-chamber spectrometer was exposed to a tagged 147-GeV/c positive beam containing ..pi../sup +/, K/sup +/, and p. A sample of 3003 K/sup +/p, 19 410 pp, and 20 745 ..pi../sup +/p interactions is used to derive sigma/sub n/, , f/sub 2//sup tsc/c, and /D for each beam particle. These values are compared to values obtained at other, mostly lower, beam momenta. The overall dependence of on E/sub a/, the available center-of-mass energy, for these three reactions as well as ..pi../sup -/p and pp interactions has been determined.

Published
1982
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4. Observation of a fully reconstructed pair with long proper lifetimes in a high resolution hydrogen bubble chamber and the European hybrid spectrometer

Author

Luciano Barone, P. F. Loverre, P. Lipari, A. Subramanian, F. Marchetto, J. Rubio, M. Mazzucato, G. Cooremans-Bertrand, A. Bergier, W. Bartl, C. Dionisi, Paolo Bagnaia, A. Michalon, Alain Hervé, Edoardo Castelli, D. Z. Toet, E. Menichetti, L. Robb, P. Poropat, R. Bizzarri, P. Herquet, E. P. Kistenev, L. Zanello, F. Hartjes, M. Aguilar-Benitez, S. Reucroft, A. Ferrando, M. Cresti, K. Paler, H. Leutz, L. Gatignon, N. Kurtz, D. Crennel, Marco Sessa, F. Etienne, Clara Troncon, Jacques Lemonne, Paolo Rossi, G. Zholobov, C. Voltolini, Pierre Vilain, P. V. Chliapnikov, P. Ladron de Guevara, C. Fisher, A. Stergiou, B. Adeva, P. Hughes, J. Kesteman, E. Johansson, H. Dibon, Stefaan Tavernier, G. Zumerle, B. Baldo, M. E. Michalon-Mentzer, D. Zanello, J. H. Wickens, J. Dumarchez, P. Porth, M. Boratav, Sven Gösta Nilsson, D. Kuhn, M. C. Touboul, D. Pascoli, Fernand Grard, J. M. Lesceux, F. Marzano, T. Moa, A.-M. Touchard, Paul Lecoq, R. Frühwirth, L. Peruzzo, G. Ciapetti, P. Pilette, Giorgio Borreani, L. Ventura, L. Montanet, S. O. Holmgren, Josef Hrubec, Pierluigi Zotto, J-C. Marin, Paolo Checchia, E. Di Capua, W. Kittel, J. Dolbeau, G. Neuhofer, M. Regler, F. Bruyant, M. Markytan, W.W.M. Allison, Alessandro Bettini, Alan Poppleton, F. Crijns, H. K. Nguyen, G. Piredda, G. Sartori, M. Van Immerseel, and B. F. Poljakov

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Photon, Spectrometer, Resolution (electron density), Momentum, Nuclear physics, Lead glass, visual_art, visual_art.visual_art_medium, Hydrogen bubble, Atomic physics, Beam (structure)
Abstract

In an experiment with 360 GeV/ c π − beam at the CERN SPS using the high resolution hydrogen bubble chamber LEBC and the European Hybrid Spectrometer, an event has been observed of the type π − p → D 0 D 0 + 8 prongs. The fully reconstructed decay modes are D 0 → K − π + π 0 π 0 and D 0 → K + π + π − π − , with all six charged tracks being detected in the spectrometer and all four photons from the π 0 decays detected in the lead glass gamma detection system. The D 0 has momentum 119.0 ± 0.6 GeV/ c , x F = 0.31, length 4.1 ± 0.1 mm and proper lifetime (2.1 ± 0.1) × 10 −13 s. The D 0 has momentum 78.5 ± 0.3 GeV/ c , x F = 0.19, length 7.5 ± 0.1 mm and proper lifetime (5.9 ± 0.1) × 10 −13 s.

Published
1981
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5. Inclusive and semi-inclusive ?0 production in ?+/??/K +/pp interactions at 147 GeV/c

Author

E. L. Koller, P. Haridas, H. Rudnicka, R. Windmolders, A. Pevsner, Z. Dziembowski, E. L. Hart, R. Dolfini, L. Berny, F. Crijns, T. A. J. Frank, R. T. Van de Walle, V. Henri, D. R. Ward, R.J. Plano, R. Heifetz, D. H. Brick, S. Taylor, D. Huang, H. O. Cohn, J. Goldberg, P.F. Jacques, G. Bressi, G. T. Condo, R.A. Burnstein, R. Yaari, W. J. Metzger, E. S. Hafen, J. Hanton, P. E. Stamer, A. Shapira, W. Kittel, S. Toaff, T. L. Watts, S. H. Oh, A. M. Shapiro, I. A. Pless, Sergio P Ratti, E.E. Ronat, Aharon Levy, Fernand Grard, P. Pilette, P. Lucas, R. J. Hulsizer, Odette Benary, J. M. Lesceux, W.W. Neale, V. Suchorebrow, M. Kalelkar, S. Tether, R. Steiner, J. Grunhaus, R. Dimarco, M. Schouten, C. Castoldi, P. Herquet, A. H. Rogers, B. M. Whyman, P. Lutz, G. Yekutieli, J. T. Bober, H. D. Taft, Y. Eisenberg, R. K. Yamamoto, E. B. Brucker, W. M. Bugg, T. Handler, C. Y. Chien, T. Ludlam, Yong-Shi Wu, T. B. Stoughton, E. D. AlyeaJr., L. Bachman, C. Pols, Gideon Alexander, H. de Bock, H. A. Rubin, M. Widgoff, Richard E. Ansorge, U. Karshon, V. Kistiakowsky, Shlomo Dado, E. Calligarich, and P. C. Trepagnier

Subjects
Quark, Density matrix, Physics, Particle physics, Valence (chemistry), Physics and Astronomy (miscellaneous), Meson, Nuclear physics, symbols.namesake, Pion, symbols, Feynman diagram, Fermilab, Nuclear Experiment, Engineering (miscellaneous), Scaling
Abstract

In an experiment with the 30-inch Hybrid Spectrometer at Fermilab we have obtained the inclusive and semi-inclusive production cross sections of the ϱ0 meson using a conventional background subtraction technique. Production cross sections for the ϱ0 are derived as a function of the Feynman scaling variablex, and the transverse variablespt2 andEt=(pt2+M2)1/2. The longitudinal distributions are compared with the (1−x) dependence of the proton and meson valence quark structure functions, using various forms of recombination and fragmentation models. The transverse distributions are compared with thermodynamic models. We give density matrix elements for the ϱ0 production from pions in the extreme forward region.

Published
1981
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6. Approach to scaling in inclusive π+/π− ratios at 147 GeV/c

Author

A. Pevsner, R. Dolfini, G. Bressi, R. Heifetz, C. Y. Chien, J. Hanton, E. S. Hafen, Yong-Shi Wu, T. Ludlam, P. C. Trepagnier, M. Schouten, T. L. Watts, R.J. Plano, R.A. Burnstein, P. Lutz, I. A. Pless, J. Grunhaus, U. Karshon, G. T. Condo, V. Suchorebrow, M. Kalelkar, V. Kistiakowsky, Shlomo Dado, S. H. Oh, R. Dimarco, H. de Bock, F. Crijns, D. H. Brick, S. Tether, E. L. Koller, A. H. Rogers, W. Kittel, S. Taylor, B. M. Whyman, E. B. Brucker, P. Haridas, P. Pilette, S. Toaff, Sergio P Ratti, J. T. Bober, R. Steiner, R. Yaari, Fernand Grard, P. Herquet, A. Shapira, E.E. Ronat, G. Yekutieli, V. Henri, C. Castoldi, E.D. Alyea, W. J. Metzger, H. D. Taft, T. B. Stoughton, Y. Eisenberg, W. M. Bugg, R. K. Yamamoto, T. Handler, Odette Benary, L. Berny, R. T. Van de Walle, J. Goldberg, P.F. Jacques, R. I. Hulsizer, E. Calligarich, H. O. Cohn, R. Windmolders, P. Lucas, D. Hochman, H. Rudnicka, E. L. Hart, D. R. Ward, J. M. Lesceux, W.W. Neale, Gideon Alexander, H. A. Rubin, Aharon Levy, T. A. J. Frank, M. Widgoff, Richard E. Ansorge, P. E. Stamer, A. M. Shapiro, D. Huang, L. Bachman, and C. Pols

Subjects
Diffraction, Quark, Physics, Valence (chemistry), Physics and Astronomy (miscellaneous), Fragmentation (mass spectrometry), Hadron, Atomic physics, Nuclear Experiment, Engineering (miscellaneous), Scaling, Dissociation (chemistry), Beam (structure)
Abstract

The ratio of hadronic π+/π− production has been studied in the target fragmentation region of π+ p, π− p,K + p andp p collisions at 147 GeV/c beam momentum. The difference between this ratio in the π+ p and π− p data is less than at lower energies but still present. No difference exists anymore for the π+/π− ratio at this energy betweenK + p andpp collisions. Exclusion of diffraction dissociation and resonance production does not change the main conclusions. The energy dependence of the ratio for π+ p and π− p collisions gives evidence for a universal asymptotic ratio for all beams. Thep t -dependence at low-p t is in agreement with the expectation from geometrical correlation of the valence quarks.

Published
1982
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7. Inclusive production of neutral strange particles by 147 GeV/cπ+/K+/p interactions in hydrogen

Author

S. Ratti, L. Berny, P. E. Stamer, R. T. Van de Walle, E.E. Ronat, G. T. Condo, J. Grunhaus, W. J. Metzger, A. M. Shapiro, G. Cecchet, D. H. Brick, V. Kistiakowsky, B. M. Whyman, Shlomo Dado, A. Napier, R.A. Burnstein, F. Crijns, Gideon Alexander, H. A. Rubin, P. Lutz, L. Bachman, C. Pols, H. Debock, T. L. Watts, A. Levy, S. Taylor, J. W. Cooper, M. Widgoff, A. Pevsner, J. M. Lesceux, W.W. Neale, P. Herquet, Y. Eisenberg, Richard E. Ansorge, E. B. Brucker, R. Windmolders, E. Calligarich, W. M. Bugg, R.J. Plano, D. Hochman, E. L. Hart, E. L. Koller, U. Karshon, C. Castoldi, G. Bressi, D. R. Ward, Fernand Grard, T. Handler, P. C. Trepagnier, John Gordon Rushbrooke, J. Tortora, D. Ljung, J. Goldberg, E. S. Hafen, S. Toaff, G. Yekutieli, Odette Benary, G. Liguori, E.D. Alyea, H. O. Cohn, V. Henri, M. Schouten, R. Yaari, H. D. Taft, A. Shapira, R. L. Plumer, C. Y. Chien, J. P. Silverman, T. Ludlam, M. Kalelkar, J. Brau, R. I. Hulsizer, J. Hanton, I. A. Pless, R. K. Yamamoto, R.D. Sard, J. R. Carter, P.F. Jacques, and R. Dolfini

Subjects
Physics, Nuclear and High Energy Physics, Strange quark, Spectrometer, Hydrogen, chemistry.chemical_element, Nuclear physics, symbols.namesake, chemistry, symbols, Feynman diagram, Rapidity, Fermilab, Multiplicity (chemistry), Scaling
Abstract

Results are presented from a study of inclusive neutral strange particle production by a 147 GeV/c tagged π+/K+/p beam in the Fermilab 30-inch hydrogen bubble chamber. The experiment made use of the proportional hybrid spectrometer system. Results are based on 995 KS0, 485 Λ, and 83 Λ found in a sample of 132 000 pictures. Cross sections are given for inclusive production of these particles by each of the three beam particles, and comparisons are made with measurements at other energies. Topological cross sections are also calculated, and KNO multiplicity scaling is investigated. Distributions are presented of invariant cross sections as functions of the Feynman scaling variable x and c.m. rapidity y. The transverse momentum-squared distributions with their fitted slopes are also given. Comparisons are made of the production characteristics for the three beam types.

Published
1980
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8. The effective-energy dependence of the charged particle's multiplicity in p/π+/K+ interactions on protons at 147 GeV/c

Author

L. Bachman, R. Yaari, A. Shapira, P.F. Jacques, Sergio P Ratti, Yong-Shi Wu, Fernand Grard, M. Schouten, E.E. Ronat, D. H. Brick, P. C. Trepagnier, E. Calligarich, M. Elahy, H. O. Cohn, R. I. Hulsizer, J. M. Lesceux, W.W. Neale, V. Kistiakowsky, L. Berny, W. J. Metzger, Shlomo Dado, R. T. Van de Walle, T. A. J. Frank, P. Lutz, R. Windmolders, U. Karshon, E. B. Brucker, R. K. Yamamoto, A. Pevsner, Odette Benary, R. Heifetz, J. Grunhaus, R. Dimarco, M. Widgoff, Richard E. Ansorge, D. Huang, T. L. Watts, C. Pols, H. Debock, J. Hanton, I. A. Pless, S. Toaff, R.A. Burnstein, Y. Eisenberg, R. Steiner, F. Crijns, W. M. Bugg, P. E. Stamer, R.J. Plano, S. Taylor, S. H. Oh, C. Castoldi, E. L. Koller, W. Kittel, Aharon Levy, J. Goldberg, A. M. Shapiro, P. Haridas, P. Lucas, S. Tether, P. Herquet, T. Handler, G. T. Condo, Gideon Alexander, H. A. Rubin, D. Hochman, P. Pilette, H. Rudnicka, V. Suchorebrow, M. Kalelkar, E. L. Hart, G. Yekutieli, D. R. Ward, E.D. Alyea, R. Dolfini, H. D. Taft, G. Bressi, V. Henri, A. H. Rogers, E. S. Hafen, T. B. Stoughton, B. M. Whyman, J. T. Bober, C. Y. Chien, and T. Ludlam

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Effective energy, Invariant mass, Multiplicity (chemistry), Total energy, Charged particle, Fermi Gamma-ray Space Telescope
Abstract

The energy dependence of the average of the charged multiplicity and its dispersion in π + /K + /p interaction on protons at 147 GeV/ c is found to be the same as in e + e − annihilations if an “effective energy” variable is used instead of the total energy. The effective energy S eff is defined as the invariant mass of all secondaries left after the two leading particles have been removed. Fitting the expression aS eff b to the average charge multiplicity 〈 n ch 〉, we find the power b to be in good agreement with the value of 0.25 predicted by Fermi's statistical model and by Landau's hydrodynamical model.

Published
1981
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9. Planar events produced in hadron-proton collisions at 147 GeV/c and their jet-like structures

Author

A. Pevsner, S. Toaff, P. E. Stamer, W. Kittel, R. Dolfini, L. Bachman, E.D. Alyea, C. Y. Chien, P. Lucas, P. C. Trepagnier, S. Taylor, B. M. Whyman, M. Widgoff, Yong-Shi Wu, H. Rudnicka, U. Karshon, V. Henri, C. Pols, Sergio P Ratti, E. Hafen, J. T. Bober, Gideon Alexander, H. A. Rubin, J. M. Lesceux, W.W. Neale, P. Pilette, Wesley James Metzger, R. I. Hulsizer, D. Huang, D. R. Ward, T. Handler, F. Carminati, T. L. Watts, J. Grunhaus, P. Haridas, R. Windmolders, T. A. J. Frank, Aharon Levy, Y. Eisenberg, R. Dimarco, R. K. Yamamoto, P. Lutz, D. H. Brick, A. Shapira, H. O. Cohn, K. A. Burnstein, F. Grard, R.J. Plano, P. Herquet, Richard E. Ansorge, J. Goldberg, E. L. Koller, V. Suchorebrow, M. Kalelkar, V. Kistiakowsky, T. Ludlam, E. B. Brucker, A. H. Rogers, H. de Bock, S. Dado, T. B. Stoughton, S. H. Oh, R. Heifetz, I. A. Pless, W. M. Bugg, M. Schouten, J. Hanton, G. T. Condo, A. M. Shapiro, E. L. Hart, J. E. Brau, R. Steiner, S. Tether, L. Berny, R. T. Van de Walle, P.F. Jacques, Odette Benary, H. Taft, and F. Crijns

Subjects
Physics, Nuclear physics, Momentum, Particle acceleration, Jet (fluid), Physics and Astronomy (miscellaneous), Proton, Phase space, Hadron, High Energy Physics::Experiment, Fermilab, Engineering (miscellaneous), Charged particle
Abstract

An analysis is presented of the production of jets in low-ptπ±p,k+p,pp collisions at 147 GeV/c collected at Fermilab in the rapid cycling hydrogen bubble chamber hybrid spectrometer. It is shown that selected events are more planar than predicted by a cylindrical phase space, but that 3-jet and 4-jet like structures seen in the momentum flows are reasonably reproduced by the cylindrical phase space events subjected to the same mathematical manipulation required to build momentum flows.

Published
1984
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10. Backscattering of light from a water droplet: The glory effect

Author

C. Deleuze, J. M. Lesceux, V. P. Henri, and Pierre Gillis

Subjects
Physics, Optics, business.industry, Simple (abstract algebra), General Physics and Astronomy, business, Glory, Light scattering, Visualization
Abstract

We discuss the theoretical attempts at explaining the glory effect and describe a simple setup that permits visualization of the glory ray.

Published
1982
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11. The European Hybrid Spectrometer - a facility to study multihadron events produced in high energy interactions

Author

O. Pingot, F. Etienne, M. Van Immerseel, B. Powell, P. Ferran, G. Passardi, A. Stergiou, W.W.M. Allison, D. Z. Toet, F. Hartjes, E. Di Capua, Alessandro Bettini, J. Kesteman, G. Chanel, S. Gentile, P. Bähler, M. De Giorgi, A. Guiard-Marigny, L. Ventura, P. Lecoq, L. Zanello, D.A. Jacobs, Edoardo Castelli, L. Montanet, S. Centro, Paolo Rossi, M. Mazzucato, N. G. Minaev, M. C. Touboul, D. Pascoli, J. M. Lesceux, W. Kittel, P. Hughes, P. Van Hal, C. Willmott, A. Bergier, G. Piredda, J.L. Bénichou, Paolo Bagnaia, G. Neuhofer, D. Gusewell, C. Ljuslin, F. Wittgenstein, P. D. Shield, S. Kitamura, M. Boratav, L. Robb, B. F. Poljakov, S. Reucroft, W. Bartil, A. Fucci, P. Gällnö, Pierluigi Zotto, D. Crennel, Paolo Checchia, A Hervé, P. Dow, M. Regler, F. Bruyant, A. Poppleton, C. Troncon, J. Duboc, D. Zanello, Manuel Aguilar-Benitez, S. O. Holmgren, C. Geles, Josef Hrubec, H. Leutz, E. P. Kistenev, A. G. Kholodenko, Gianni Zumerle, C. Fischer, L. Barone, J. Tischhauser, P. Poropat, J. C. Marin, T. Moa, R. Settles, K.E. Johansson, M. Pernicka, T. Lingjaerde, F. Prent, B. Brooks, P. Ladron de Guevara, R. Frühwirth, and M. Dykes

Subjects
Physics, Spectrometer, Physics::Instrumentation and Detectors, Track (disk drive), Resolution (electron density), Detector, General Engineering, Nuclear physics, Bubble chamber, Particle, High Energy Physics::Experiment, Charm (quantum number), Detectors and Experimental Techniques, Nuclear Experiment, Event (particle physics)
Abstract

The European Hybrid Spectrometer is described in its preliminary version for the NA16 charm experiment. The performance of the small hydrogen bubble chamber LEBC and the detectors of the spectrometer is discussed. In particular the combination of the bubble chamber information with the spectrometer data is described in detail. The track reconstruction efficiency is 90%. The precision with which vertices seen in the bubble chamber are reconstructed is around 10 μm and the two track resolution is 40 μm. Therefore very complex event configurations, in particular charm particle decays, can be reconstructed correctly.

Published
1983
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12. InclusiveΔ++production inpp,K+p,π+p, andπ−pinteractions at 147 GeV/c

Author

Y. Eisenberg, W. J. Metzger, P. Lutz, V. Kistiakowsky, Sergio P Ratti, Fernand Grard, E. B. Brucker, Shlomo Dado, W. M. Bugg, T. L. Watts, L. Bachman, D. H. Brick, P. Herquet, M. Kalelkar, C. Y. Chien, T. Handler, S. Toaff, R.J. Plano, J. P. Silverman, T. Ludlam, H. O. Cohn, J. W. Cooper, C. Pols, W. Kittel, A. Napier, B. M. Whyman, G. Cecchet, G. T. Condo, P. E. Stamer, R. Dolfini, H. Debock, G. Bressi, S. Dagan, E. L. Hart, Y. Oren, E.E. Ronat, R. Windmolders, A. M. Shapiro, E. S. Hafen, P. C. Trepagnier, D. R. Ward, R. I. Hulsizer, V. Henri, J. Hanton, U. Karshon, R.A. Burnstein, C. Castoldi, E. Calligarich, R. K. Yamamoto, R.D. Sard, J. Goldberg, I. A. Pless, R. L. Plumer, J. R. Carter, F. Crijns, R. Yaari, S. Taylor, E. L. Koller, A. Shapira, J. E. Brau, J. Grunhaus, G. Yekutieli, D. Hochman, E.D. Alyea, D. Lissauer, Odette Benary, G. Liguori, H. D. Taft, M. Widgoff, L. Berny, Richard E. Ansorge, R. T. Van de Walle, P.F. Jacques, Gideon Alexander, H. A. Rubin, Aharon Levy, A. Pevsner, W.W. Neale, M. Schouten, John Gordon Rushbrooke, J. Tortora, D. Ljung, and J. M. Lesceux

Subjects
Physics, Delta, Particle physics, Angular distribution, Stereochemistry, Pi
Published
1980
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13. Search for long-lived charge +2 hadrons

Author

M. von Randow, Y. Eisenberg, T. A. J. Frank, J. M. Lesceux, E. L. Koller, W. M. Bugg, W. J. Metzger, S. Tether, M. Widgoff, Richard E. Ansorge, R.J. Plano, P. Haridas, H. Rudnicka, T. Handler, P. Lutz, Sergio P Ratti, Fernand Grard, E. S. Hafen, H. O. Cohn, U. Karshon, R. K. Yamamoto, J. Hanton, P. E. Stamer, E.D. Alyea, P. C. Trepagnier, W. Kittel, M. Schouten, H. D. Taft, A. Shapira, J. Goldberg, T. L. Watts, I. A. Pless, S. H. Oh, V. Suchorebrow, M. Kalelkar, A. M. Shapiro, G. T. Condo, R. Windmolders, L. Bachman, W.W. Neale, Odette Benary, J. E. Brau, R. Steiner, R. T. Van de Walle, R. Dolfini, D. Huang, V. Kistiakowsky, R.A. Burnstein, C. Pols, Gideon Alexander, E. B. Brucker, Shlomo Dado, R. I. Hulsizer, H. A. Rubin, H. Debock, A. Pevsner, V. Henri, F. Crijns, D. H. Brick, Aharon Levy, P.F. Jacques, R. Heifetz, E. L. Hart, D. R. Ward, S. Taylor, T. B. Stoughton, A. H. Rogers, B. M. Whyman, J. T. Bober, F. Carminati, J. Grunhaus, P. W. Lucas, R. Dimarco, C. Y. Chien, Yang Wu, T. Ludlam, and P. Herquet

Subjects
Physics, Nuclear physics, Particle physics, Gluino, Up quark, Hadron, Elementary particle, Charge (physics)
Abstract

We have searched for the production of long-lived R-..delta../sup + +/ hadrons, which contain a gluino in addition to three up quarks, in pp, ..pi../sup +/p, and K/sup +/p interactions at 147 GeV/c. For R-..delta../sup + +/'s of lifetime greater than 10/sup -9/ sec, and laboratory momentum greater than 2 GeV/c, we place 90%-confidence-level upper limits of 6.1 ..mu..b in pp collisions, 4.4 ..mu..b in ..pi../sup +/p, and 29 ..mu..b in K/sup +/p.

Published
1984
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