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11 results on '"D Broemmelsiek"'

1. Inclusive V production cross sections from 920 GeV fixed target proton-nucleus collisions

Author

Imma Riu, F. Sanchez, Hernan Wahlberg, L. Garrido, B. Bobchenko, N. Tesch, Brian Petersen, I. Kisel, C. Stegmann, C. B. Krauss, Mikhail Zavertyaev, O. Barsukova, J. L. Rosen, O. Steinkamp, Ulrich Werthenbach, D. Ryzhikov, F. Klefenz, D. Dujmic, I. Belotelov, H. Kapitza, H. Thurn, Yu. Pavlenko, P. Kreuzer, Jenny Ivarsson, Pietro Faccioli, M. Beck, I. Golutvin, V. Aushev, R. Wurth, T. Perschke, Mauro Villa, D. Broemmelsiek, M. Chmeissani, H. Sun, J. Yang, A. Michetti, Paul Edmund Karchin, A. Stanovnik, H. Fleckenstein, M. Ouchrif, S. Korpar, J. Luidemann, M. Spahn, K. Hofner, A. Kaoukher, Helmut Wolters, V. Saveliev, L. Sozuer, V. Vagnoni, J. Chamanina, A. Bogatyrev, Farid Ould-Saada, Kwong Lau, B. Lewende, M. Mevius, Yu.V. Mikhailov, L. Seybold, Ramon Miquel, J. D. Hansen, Søren Schmidt, Peter Robmann, Wolfgang Wagner, R. van Staa, R Stdenis, S. Hausmann, R. Chistov, D. Samtleben, B. Lomonosov, K. Berkhan, V. Rusinov, V. Eiges, M. Medinnis, D. C. Goulart, Dmitry Emeliyanov, S. Schaller, Z. Ke, I. Belyaev, A. Zhelezov, Samim Erhan, W. Ruckstuhl, A. Moshkin, V. Popov, Werner Hofmann, P.E. Schlein, J. Glass, R. F. Schwitters, Valery Pugatch, S. Essenov, J.J. Wang, D. Wegener, J. Rieling, Roberto Spighi, R. Mankel, A. Lange, D. Krücker, S. Nowak, D. Pose, J. Bastos, A. Belkov, Hyun-Chul Kim, N.N. Karpenko, W. Schmidt-Parzefall, Umberto Marini Bettolo Marconi, S. Steinbeck, V. Souvorov, A. Schreiner, Thomas Hamacher, B. Dolgoshein, W. Gradl, M. A. Pleier, C. Borgmeier, A. S. Schwarz, K. T. Knöpfle, B. Schwenninger, K. E. K. Gerndt, Antonio Zoccoli, Y. Guilitsky, Y. Vassiliev, U. Straumann, Yu.T. Kiryushin, I. Gorbounov, F. Saadi-Ludemannm, M. Dressel, M. Poli, D. Peralta, T. Lohse, I. Negri, M. Capeans, A. Bertin, Antonio Sbrizzi, Z. Zheng, S. Karabekyan, Y. Bagaturia, S. Ramachandran, G. Leffers, A. Vitale, I. Vukotic, S. Semenov, J. Zweizig, K. M. Danielsen, Benedetto Giacobbe, A. Gellrich, X. Dong, S. Shuvalov, Reinhard Männer, B. Schwingenheuer, B. Fominykh, F. Khasanov, M. Nörenberg, V. Rybnikov, M. Funcke, M. Walter, Nicola Semprini-Cesari, M. Bruinsma, M. Bargiotti, P. Pakhlov, C. van Eldik, H. Deppe, David Gascon, M. Hildebrandt, Kendall Reeves, I. C. Legrand, Vasco Amaral, S. Fourletov, M. Rietz, J. Shiu, O. Gouchtchine, J. Pyrlik, S. Solunin, W. Fallot-Burghardt, S. Keller, S. F. Takach, Christian Bauer, T. Glebe, Andrej Gorišek, D. Galli, H. Schröder, M. Ispiryan, M. Titov, G. Bohm, V. Bassetti, T. Fuljahn, Hermann Kolanoski, L. Matchikhilian, F Sciacca, Klaus Dehmelt, S. Gradl, R. Pernack, S. Issever, H. Itterbeck, V. Kochetkov, T. Zeuner, D. Skrk, I. Abt, B. X. Chen, M. Sang, P. Truöl, W. Hulsbergen, R. Baghshetsyan, P. J. Weyers, R. Wanke, J. Spengler, B. Schmidt, K. Ehret, Yuriy Pylypchenko, R. Pestotnik, Y. Jia, T. Buran, R. Loke, F. Sun, Ulrich Husemann, J. Flammer, M. Böcker, A. Pose, C. Jiang, A. Spiridonov, A. Christensen, M. Symalla, R. Eckmann, A. Golutvin, S. J. Aplin, João Carvalho, U. Trunk, M. S. Atiya, I. Tsakov, S. Nam, Olga Igonkina, V. Balagura, R. Muresan, M. Feuerstack-Raible, Y. Wang, C. Hast, G. Zech, A. Mohapatra, H. B. Dreis, M. Buchler, Mogens Dam, I. Arino, R. Mizuk, U. Schwanke, Laura Fabbri, S. De Castro, M. Danilov, P. Krizan, S. Masciocchi, A. H. Walenta, D. Goloubkov, K. Riechmann, B. Moshous, A. Lanyov, G. Medin, Z. Zhu, H. Deckers, A. Soldatov, T. Zivko, Marcus Hohlmann, A. Arefiev, F. Ratnikov, I. Tikhomirov, H. Albrecht, R. Zimmermann, I. Massa, A. Garcia, R. F. Harr, M. T. N. P. de Vera, T. Oest, D. Ressing, V. Egorytchev, A. Oliveira, A. Wurz, M. Bräuer, C. Rothe, H. D. Schultz, António Amorim, Peter Buchholz, T. Kvaratskheliia, Th.S. Bauer, T. Walter, M. Starič, A. Somov, M. Adams, E. Sexauer, M. Negodaev, Yang Liu, A. J. Schwartz, D. Stieler, Jose M Hernandez, M. Bruschi, M. Piccinini, A. Hoscher, G.J. Wagner, I. Siccama, M. Schmelling, S. Barsuk, S. Spratte, F. Eisele, M. Capponi, T. Hott, P. Conde, T. Jagla, S. Somov, Yu. Zaitsev, C. Cruse, C. Padilla, S. Xella-Hansen, A. Abyzov, and U. Uwer

Subjects
Physics, Physics and Astronomy (miscellaneous), Proton, 010308 nuclear & particles physics, Sigma, HERA, Lambda, 7. Clean energy, 01 natural sciences, Atomic mass, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Nucleon, 010303 astronomy & astrophysics, Engineering (miscellaneous), HERA-B, Bar (unit)
Abstract

Inclusive differential cross sections dsigma(pA)/dx(F) and dsigma(pA)/dp(t)(2) for the production of K-S(0), Lambda, and (U) over bar particles are measured at HERA in proton-induced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to roots = 41.6 GeV in the proton-nucleon system. The ratios of differential cross sections dsigma(pA)(K-S(0))/dsigma(pA)(Lambda) and dsigma(pA)((U) over bar)/dsigma(pA) (Lambda) are measured to be 6.2 +/- 0.5 and 0.66 +/- 0.07, respectively, for x(F) approximate to -0.06. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions da,Ald t also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections sigma(pA) on the atomic mass A of the target material is discussed, and the deduced cross sections per nucleon sigma(pN) are compared with results obtained at other energies.

Published
2003

2. J/psi production via chi(c) decays in 920 GeV pA interactions

Author

Samim Erhan, P. Kreuzer, M. Noerenberg, M. T. Nunez Pardo de Vera, R. Muresan, B. Schmidt, L. Garrido, H. B. Dreis, K. Berkhan, T. Hott, A. Stanovnik, U. Uwer, Sebastian Nowak, V. Rusinov, D. Wegener, R. Mizuk, C. Borgmeier, W. Gradl, M. Walter, D. Ryzhikov, Peter Robmann, M. Hildebrandt, S. Schmidt, B. A. Petersen, V. Saveliev, O. Gouchtchine, R. vanStaa, K. Riechmann, J. Yang, Pietro Faccioli, I. Massa, V. Aushev, J.D. Hansen, M. Spahn, C. Cruse, H. Wahlberg, D. Dujmic, J. Glaess, G. Bohm, C. Hast, Hermann Kolanoski, M. Dressel, A. Somov, G. Medin, J. Chamanina, J. Zweizig, P.E. Schlein, K. M. Danielsen, R. F. Schwitters, R. Eckmann, P. Conde, D. Kruecker, Igor Golutvin, M. Boecker, T. Jagla, S. Schaller, A. Moshkin, R. Wanke, A. Zhelezov, Yu. Zaitsev, Y. Pylypchenko, O. Steinkamp, T. Zivko, L. Sozuer, F. Sanchez, Jenny Ivarsson, M. Capponi, D. Goloubkov, K. T. Knöpfle, Kwong Lau, A. Gellrich, W. Schmidt-Parzefall, R. Spighi, Thomas Hamacher, Y. Vassiliev, I. Negri, G. Leffers, Rok Pestotnik, M. Symalla, S. J. Aplin, H. Schroeder, S. Essenov, A. Michetti, Paul Edmund Karchin, Y. Guilitsky, S. Steinbeck, S. Solunin, W. Fallot-Burghardt, U. Werthenbach, Yu.V. Mikhailov, A. Kaoukher, G.J. Wagner, B. Lewendel, David Gascon, S. F. Takach, M. Titov, T. Zeuner, A. H. Walenta, Y. Wang, J. Spengler, A. Belkov, L. Matchikhilian, O. Barsukova, S. Karabekyan, R Stdenis, U. Trunk, A. J. Schwartz, D. Stieler, Jose M Hernandez, I. Siccama, I. Abt, H. Itterbeck, Ramon Miquel, R. Baghshetsyan, D. C. Goulart, D. Galli, V. Popov, Werner Hofmann, Imma Riu, Mikhail Zavertyaev, B. Dolgoshein, V. Kochetkov, Ch. Rothe, B. Schwenninger, B. Giacobbe, S. Shuvalov, B. Bobchenko, M. Capeans, Yu. Pavlenko, Hyun-Chul Kim, A. Arefiev, S. De Castro, A. Wurz, Yu.T. Kiryushin, Laura Fabbri, L. Seybold, A. Lanyov, F. Klefenz, B. Lomonosov, V. Eiges, M. Feuerstack-Raible, C. Jiang, A. Spiridonov, V. Rybnikov, A. Golutvin, C. Padilla, W. Ruckstuhl, F. Ratnikov, I. Tikhomirov, S. Nam, Nicola Semprini-Cesari, Mauro Villa, M. Schmelling, M. A. Pleier, K. Höpfner, A. Christensen, Y. Bagaturia, Christian Bauer, D. Peralta, V. Bassetti, R. Wurth, B. Moshous, U. Schwanke, P. Truöl, C. B. Krauss, T. Oest, S. Barsuk, Samo Korpar, M. Poli, M. Adams, N. Tesch, U. Marconi, Fouzia Saadi-Lüdemann, Antonio Zoccoli, Jian Wang, M. Chmeissani, João Carvalho, Antonio Sbrizzi, J. Lüdemann, S. Spratte, E. Sexauer, D. Ressing, F. Khasanov, Robert Harr, S. Hausmann, I. Vukotic, S. Xella-Hansen, A. Bogatyrev, M. Bruinsma, U. Husemann, M. Negodaev, Kendall Reeves, T. Glebe, S. Fourletov, V. Souvorov, J. Bastos, T. Buran, I. Kisel, M. Buchler, I. Belyaev, Maurizio Piccinini, Y. Goloubkov, A. Gorisek, Dmitry Emeliyanov, T. Perschke, I. Tsakov, S. Gradl, A. Schreiner, S. Ramachandran, S. Keller, Vasco Amaral, X. Chen, F Sciacca, Klaus Dehmelt, Mogens Dam, X. Dong, R. Pernack, S. Issever, M. Sang, A. S. Schwarz, Th. S. Bauer, J. L. Rosen, A. Bertin, K. Ehret, N.N. Karpenko, D. Broemmelsiek, P. J. Weyers, R. Loke, K. E. K. Gerndt, Yunpeng Liu, Peter Buchholz, B. Schwingenheuer, A. Pose, W. Hulsbergen, Y. Jia, Z. Zheng, Marco Bruschi, A. Holscher, T. Walter, Thomas Lohse, J. Pyrlik, F. Eisele, A. Soldatov, Marcus Hohlmann, S. Somov, M. Ispiryan, J. Flammer, M. Bargiotti, B. Fominykh, Helmut Wolters, Farid Ould-Saada, M. Ouchrif, I. Arino, Wolfgang Wagner, M. Beck, Olga Igonkina, R. Zimmermann, P. Krizan, V. Balagura, H. Deckers, M. Danilov, I. Gorbounov, G. Zech, A. Mohapatra, T. Kvaratskheliia, R. Mankel, M. Funcke, I. C. Legrand, H. Albrecht, M. Starič, D. Skrk, V. Egorytchev, A. Oliveira, A. Lange, D. Pose, M. Braeuer, Mike Medinnis, C. van Eldik, Z. Ke, H. Deppe, J. Rieling, H. D. Schultz, Vincenzo Vagnoni, M. Rietz, C. Stegmann, A. Vitale, S. Semenov, António Amorim, T. Fuljahn, A. Garcia, R. Maenner, M. Mevius, H. Fleckenstein, R. Chistov, D. Samtleben, I. Belotelov, H. Kapitza, H. Thurn, Valery Pugatch, M. S. Atiya, S. Masciocchi, Z. Zhu, Geometry, (Astro)-Particles Physics, Mathematical Analysis, and Business Web and Media

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, HERA-B
Abstract

Using data collected by the HERA-B experiment, we have measured the fraction of J\psi's produced via radiative chi_c decays in interactions of 920 GeV protons with carbon and titanium targets. We obtained R_{\chi_c} = 0.32 \pm 0.06_{stat} \pm 0.04_{sys} for the fraction of J\psi from chi_c decays averaged over proton-carbon and proton-titanium collisions. This result is in agreement with previous measurements and is compared with theoretical predictions., Comment: 16 pages, 5 figs

Published
2003

3. Measurement of the $b\overline{b}$ production cross section in 920 GeV fixed-target proton-nucleus collisions

Author

R. Spighi, Dmitry Emeliyanov, H. Fleckenstein, Jian Wang, R. van Staa, S. Hausmann, Y. Pylypchenko, T. Glebe, Antonio Zoccoli, R. Chistov, D. Samtleben, I. Siccama, Imma Riu, C. B. Krauss, B. Bobchenko, A. Hoscher, T. Zeuner, I. C. Legrand, W. Hulsbergen, Y. Jia, Z. Zheng, J. Flammer, R. Baghshetsyan, A. Bogatyrev, D. Broemmelsiek, Olga Igonkina, K. E. K. Gerndt, D. Skrk, Y. Vassiliev, M. Hildebrandt, V. Balagura, J. Bastos, G. Zech, A. Mohapatra, A. Belkov, Valery Pugatch, M. Bräuer, G.J. Wagner, H. Kapitza, M. A. Pleier, S. Gradl, A. Schreiner, Maurizio Piccinini, H. Thurn, Sebastian Nowak, V. Rusinov, Th. S. Bauer, B. X. Chen, R. Mizuk, V. Souvorov, T. Buran, D. Wegener, W. Gradl, S. Essenov, L. Seybold, Søren Schmidt, K. Riechmann, R. Pernack, S. Issever, S. Karabekyan, J. Rosen, Z. Ke, B. Lomonosov, J. Rieling, V. Eiges, H. Albrecht, Vincenzo Vagnoni, P. J. Weyers, R. Loke, S. Somov, M. Ouchrif, H. Wahlberg, M. Böcker, A. Pose, I. Belyaev, A. Lange, K. M. Danielsen, Jenny Ivarsson, M. Capponi, M. Atiya, V. Amaral, I. Massa, A. Abyzov, T. Oest, G. Medin, D. Galli, F. Eisele, Hyun-Chul Kim, Samim Erhan, T. Zivko, U. Marconi, S. Masciocchi, D. Pose, M. Symalla, S. J. Aplin, F. Sanchez, C. van Eldik, Marco Bruschi, H. Sun, A. Michetti, Paul Edmund Karchin, H. Deppe, A. Kaoukher, W. Ruckstuhl, D. Peralta, Z. Zhu, B. Moshous, Peter Robmann, S. De Castro, I. Vukotic, V. Egorytchev, A. Oliveira, M. Rietz, A. Arefiev, P. Kreuzer, J. Shiu, S. Xella-Hansen, David Gascon, U. Schwanke, Ramon Miquel, C. Rothe, H. D. Schultz, H. B. Dreis, K. Berkhan, T. Hott, Peter E. Schlein, J. Luidemann, Y. Wang, C. Stegmann, A. Vitale, Andrej Gorišek, A. Bertin, M. Walter, S. Semenov, C. Borgmeier, M. Poli, Helmut Wolters, Farid Ould-Saada, T. Fuljahn, L. Garrido, F. Ratnikov, I. Tikhomirov, C. Jiang, O. Barsukova, A. Spiridonov, A. Stanovnik, O. Gouchtchine, S. Shuvalov, F. Klefenz, Ulrich Werthenbach, D. Ryzhikov, Wolfgang Wagner, A. Christensen, Mike Medinnis, O. Steinkamp, S. Steinbeck, J. Glass, R. F. Schwitters, R. Pestotnik, M. T. N. P. de Vera, Robert Harr, V. Saveliev, G. Bohm, M. Spahn, Hermann Kolanoski, B. Schwingenheuer, Nicola Semprini-Cesari, M. Schmelling, Pietro Faccioli, V. Aushev, Y. Guilitsky, B. Dolgoshein, M. Capeans, J. Yang, R. Wanke, F. Sun, M. Mevius, Christian Bauer, Laura Fabbri, F. Saadi-Ludemannm, Thomas Hamacher, Antonio Sbrizzi, C. Padilla, U. Uwer, I. Belotelov, M. Nörenberg, T. Perschke, H. Schröder, A. Wurz, J. Zweizig, S. F. Takach, J. Chamanina, M. Titov, J. D. Hansen, X. Dong, B. A. A. Petersen, Mogens Dam, L. Sozuer, K. Hofner, P. Krizan, D. Goloubkov, Y. Bagaturia, I. Negri, G. Leffers, S. Barsuk, M. Beck, M. Bargiotti, B. Fominykh, S. Solunin, A. Soldatov, F Sciacca, Marcus Hohlmann, Klaus Dehmelt, W. Schmidt-Parzefall, W. Fallot-Burghardt, M. Ispiryan, D. Dujmic, I. Tsakov, L. Matchikhilian, S. Spratte, D. Ressing, R. Zimmermann, H. Itterbeck, V. Kochetkov, R. Eckmann, P. Conde, Igor Golutvin, T. Jagla, A. Garcia, N. N. Karpenko, A. Amorim, A. Moshkin, T. Walter, Ulrich Husemann, I. Arino, João Carvalho, Yu. Zaitsev, D. Krucker, H. Deckers, M. Danilov, C. Cruse, R Stdenis, M. Dressel, Peter Buchholz, A. H. Walenta, I. Gorbounov, R. Mankel, Kwong Lau, A. Gellrich, M. Funcke, T. Kvaratskheliia, R. Wurth, M. Chmeissani, B. Lewende, S. Ramachandran, A. S. Schwarz, R. Manner, A. J. Schwartz, A. Golutvin, S. Nam, M. Bruinsma, P. Pakhlov, Kendall Reeves, M. Sang, K. Ehret, I. Kisel, M. Buchler, F. Khasanov, Thomas Lohse, S. Fourletov, S. Keller, I. Abt, J. Spengler, U. Trunk, A. Lanyov, A. Zhelezov, K. T. Knöpfle, Yang Liu, U. Straumann, D. Stieler, Jose M Hernandez, B. Giacobbe, M. Adams, N. Tesch, E. Sexauer, Yu.V. Mikhailov, M. Negodaev, Mikhail Zavertyaev, D. C. Goulart, M. Starič, A. Somov, Yu. Pavlenko, S. Schaller, V. Popov, Werner Hofmann, J. Pyrlik, B. Schwenninger, Mauro Villa, Samo Korpar, Yu.T. Kiryushin, M. Feuerstack-Raible, V. Rybnikov, V. Bassetti, P. Truöl, B. Schmidt, R. Muresan, C. Hast, Geometry, (Astro)-Particles Physics, Mathematical Analysis, and Business Web and Media

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Proton, 010308 nuclear & particles physics, Nuclear Theory, High Energy Physics::Phenomenology, Sigma, HERA, 01 natural sciences, Bottom quark, High Energy Physics - Experiment, Nuclear physics, Cross section (physics), 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), HERA-B, Bar (unit)
Abstract

Using the HERA-B detector, the b-bbar production cross section has been measured in 920 GeV proton collisions on carbon and titanium targets. The b-bbar production was tagged via inclusive bottom quark decays into J/psi, by exploiting the longitudinal separation of J/psi->ll decay vertices from the primary proton-nucleus interaction. Both $e^+e^-$ and $\mu^+\mu^-$ channels have been reconstructed and the combined analysis yields the cross section $\sigma(b \bar b) = 32 ^{+14}_{-12} (stat) ^{+6}_{-7} (sys) nb/nucleon$., Comment: 22 pages, 10 Postscript figures

Published
2003

4. Observation of the radiative decayJψ→e+e−γ

Author

M. Church, M. M. Macri, Nadia Pastrone, Sandro Palestini, S. Trokenheim, A. Gianoli, S. Passaggio, G. Rinaudo, C. M. Ginsburg, G. Govi, Roberto Calabrese, T. A. Armstrong, James E. Fast, Giorgio Borreani, M. F. Weber, M. Fabbri, S. Pordes, R. Ray, M. Martini, F. Marchetto, M. Savrie, M. Masuzawa, Y. Zhang, E. Menichetti, A. Buzzo, A. J. S. Smith, J. Zhao, S. J. Werkema, W. Marsh, M. Sozzi, J. L. Rosen, J. Marques, John Peoples, D. Dimitroyannis, Eleonora Luppi, Fabrizio Petrucci, A. Migliori, P. F. Dalpiaz, M.G. Pia, C. Patrignani, M. Mandelkern, A. Ceccucci, Raymond A. Lewis, R. Mussa, Cristina Biino, B. Roccuzzo, A. Hahn, D. Broemmelsiek, M. Hasan, G. Zioulas, A. M. Majewska, Marco Pallavicini, R. Cester, K. E. Gollwitzer, D. Bettoni, V. Bharadwaj, Mauro Marinelli, J. D. Reid, J. Schultz, G. A. Smith, P. A. Rapidis, M. Sarmiento, K. K. Seth, A. Santroni, and S. Hsueh

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Branching fraction, Radiative transfer, Radiative decay, Mode (statistics), High Energy Physics::Experiment, Radiation, Nuclear Experiment, Energy (signal processing)
Abstract

We report the first observation of the (radiative) decay Jψ→e+e−γ. Our data are from an experiment in which Jψ is formed in antiproton-proton annihilations. The observed rate is consistent with a QED calculation based on final state radiation. Our measurement gives a branching ratio for this mode of (8.8±1.3±0.4)×10−3 for γ energy>100 MeV.

Published
1996

5. Production of the f2 (1520) resonance in antiproton—proton annihilations at

Author

W. Marsh, P. F. Dalpiaz, M. Sozzi, A. Migliori, John Peoples, Nadia Pastrone, S. Hsueh, J. D. Reid, Kamal K. Seth, M. Mandelkern, P. A. Rapidis, G. Rinaudo, B. Roccuzzo, M. Sarmiento, A. Scalisi, M. Macri, D. Broemmelsiek, A. Gianoli, A. J. S. Smith, S. Pordes, M. F. Weber, R.A. Lewis, R. Ray, E. Menichetti, J. L. Rosen, J. Marques, Cristina Biino, R. Dibenedetto, A. Buzzo, F. Petrucci, A. Santroni, M. Martini, K. Gollwitzer, J. Schultz, V. Bharadwaj, M. Hasan, S. Palestini, G. A. Smith, T. A. Armstrong, D. Bettoni, A. M. Majewska, Marco Pallavicini, C. Patrignani, F. Marchetto, M. Masuzawa, S. J. Werkema, Giorgio Borreani, A. Cecuucci, G. Zioulas, L. Pesando, R. Cester, Y. Zhang, D. Dimitroyannis, S. Trokenheim, Roberto Calabrese, M. Church, R. Mussa, M. Fabbri, C. M. Ginsburg, J. Zhao, A. Hahn, M. Savrie, J. Fast, Eleonora Luppi, Maria Grazia Pia, and Mauro Marinelli

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Annihilation, Proton, Antiproton, Mass spectrum, Physics::Accelerator Physics, Resonance, Nuclear Experiment
Abstract

We present measurements of the 2π0 mass spectrum in proton—antiproton annihilations. The f2 (1520) resonance is strongly produced in the 3π0 channel. Its production along with an η is observed, but strongly suppressed. Other features are seen in the data, including the f2 (1270) and structures at 2000 MeV/c2 and above.

Published
1993

6. Antiproton Cooling in the Fermilab Recycler Ring

Author

M. Sutherland, G. Saewert, Alexander Shemyakin, B. Kramper, C. Gattuso, A. Burov, A. Warner, A. Bolshakov, J. Leibfritz, M. Hu, D. Broemmelsiek, T. Kroc, K. Carlson, S. Pruss, C.W. Schmidt, G. Kazakevich, S. Nagaitsev, S. Seletskiy, V. Tupikov, P. Zenkevich, and Lionel Prost

Subjects
Physics, Particle physics, Luminosity (scattering theory), Tevatron, Particle accelerator, law.invention, Nuclear physics, law, Antiproton, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics, Fermilab, Nuclear Experiment, Collider, Storage ring, Electron cooling
Abstract

The 8.9‐GeV/c Recycler antiproton storage ring is equipped with both stochastic and electron cooling systems. These cooling systems are designed to assist accumulation of antiprotons for the Tevatron collider operations. In this paper we report on an experimental demonstration of electron cooling of high‐energy antiprotons. At the time of writing this report, the Recycler electron cooling system is routinely used in collider operations. It has helped to set recent peak luminosity records.

Published
2006

7. Fermilab recycler stochastic cooling commissioning and performance

Author

R. Pasquinelli and D. Broemmelsiek

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, Tevatron, Particle accelerator, Main injector, law.invention, Nuclear physics, Accumulator (energy), law, Antiproton, Stochastic cooling, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics, Fermilab, Nuclear Experiment, Storage ring
Abstract

The Fermilab Recycler is a fixed 8 GeV kinetic energy storage ring located in the Fermilab Main Injector tunnel near the ceiling. The recycler has two roles in Run II. First, to store antiprotons from the Fermilab Antiproton Accumulator so that the antiproton production rate is no longer compromised by large numbers of antiprotons stored in the accumulator. Second, to receive antiprotons from the Fermilab Tevatron at the end of luminosity periods. To perform each of these roles, stochastic cooling in the recycler is needed to preserve and cool antiprotons in preparation for transfer to the Tevatron. The commissioning and performance of the Recycler stochastic cooling systems will be reviewed

Published
2004

8. Evidence for ηη resonances in antiproton-proton annihilations at

Author

R. Mussa, D. Broemmelsiek, J. L. Rosen, Nadia Pastrone, C. M. Ginsburg, G. A. Smith, D. Dimitroyannis, J. Zhao, Eleonora Luppi, C. Patrignani, M. Masuzawa, S. J. Werkema, M. Macri, M. Savrie, M. Hasan, Roberto Calabrese, A. Buzzo, J. D. Reid, J. Schultz, A. M. Majewska, Marco Pallavicini, R. Dibenedetto, M. Sozzi, P. F. Dalpiaz, W. Marsh, S. Palestini, A. Ceccucci, John Peoples, L. Pesando, K. Gollwitzer, T. A. Armstrong, F. Petrucci, A. Migliori, G. Rinaudo, Giorgio Borreani, V. Bharadwaj, F. Marchetto, M. Mandelkern, A. Gianoli, A. Santroni, M. G. Pia, J. Marques, Y. Zhang, B. Roccuzzo, M. Church, A. Scalisi, Kamal K. Seth, S. Pordes, A. J. S. Smith, G. Ioulas, R.A. Lewis, M. Sarmiento, R. Ray, Mauro Marinelli, M. F. Weber, E. Menichetti, Cristina Biino, S. Hsueh, S. Trokenheim, D. Bettoni, M. Martini, P. A. Rapidis, M. Fabbri, A. Hahn, and J. Fast

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Annihilation, Proton, Antiproton, Nuclear Theory, Physics::Accelerator Physics, Resonance, Fermilab, Nuclear Experiment
Abstract

We present the first high-statistics study of the ηη system over the mass range 1000–3000 MeV/c2. The experiment was performed at the Fermilab Antiproton Accumulator, and the data sample consists of six-photon final states produced in antiproton-proton annihilations at s in the range 2950–3620 MeV. We find evidence for three states with masses 1488 ± 10 MeV/c2, 1748 ± 10 MeV/c2 and 2104 ± 20 MeV/c2 respectively.

Published
1993

9. Light quark spectroscopy at the Fermilab antiproton accumulator

Author

Giorgio Borreani, G. Zioulas, P. A. Rapidis, Maria Grazia Pia, Mauro Marinelli, M. Church, D. Broemmelsiek, R. Dibenedetto, Y. Zhang, M. Masuzawa, S. J. Werkema, M. Savrie, F. Petrucci, M. Macri, Nadia Pastrone, R. E. Ray, J. Schultz, Roberto Calabrese, S. Pordes, K. Gollwitzer, J. Zhao, G. A. Smith, S. Palestini, D. Bettoni, D. Dimitroyannis, V. Bharadwaj, T. A. Armstrong, L. Pesando, E. Menichetti, R. Cester, M. Hasan, W. Marsh, J. Fast, J. Marques, F. Marchetto, J. D. Reid, John Peoples, G. Rinaudo, A. M. Majewska, Marco Pallavicini, M. Martini, P. F. Dalpiaz, J. L. Rosen, A. Scalisi, A. J. S. Smith, M. Fabbri, Kamal K. Seth, C. M. Ginsburg, M. Mandelkern, S. Hsueh, A. A. Hahn, A. Gianoli, Cristina Biino, R. A. Lewis, M. Sozzi, A. Buzzo, C. Patrignani, Eleonora Luppi, S. Trokenheim, A. Ceccucci, A. Santroni, M. Sarmiento, M. F. Weber, B. Roccuzzo, A. Migliori, and R. Mussa

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Dalitz plot, Nuclear physics, Particle decay, Pion, Antiproton, High Energy Physics::Experiment, Invariant mass, Fermilab, Nuclear Experiment
Abstract

Fermilab experiment E-760 has confirmed the f2(1520) state in the 3πo final state in antiproton-proton annihilations in-flight (~3.0 to 3.6 GeV c.m. energy), seen previously by Crystal Barrel and other groups at CERN at rest. The f2(1520) is also seen in its 2πo decay mode in the 2πoη channel and 2η decay mode in the πo2η channel. There are indications of this state in the 3η decay channel. The invariant mass spectrum is rich in states near 2 GeV, and amplitude and spin/parity analysis of the Dalitz plot is in progress in this mass region.

Published
1993

10. Precision measurements of antiproton-proton forward elastic scattering parameters in the 3.7 to 6.2 GeV/c region

Author

P. A. Rapidis, Enrico Robutti, S. Passagio, J. D. Reid, G. Rinaudo, M. Sozzi, J. L. Rosen, M. F. Weber, G. Blanford, Nadia Pastrone, M. Macri, A. J. S. Smith, P. F. Dalpiaz, G. Zioulas, S. Trokenheim, A. Buzzo, D. Broemmelsiek, Maria Grazia Pia, B. Roccuzzo, A. Ceccucci, F. Petrucci, R. Ray, Cristina Biino, M. Fabbri, E. Menichetti, G. A. Smith, S. Hsueh, C. Patrignani, G. Govi, K. Gollwitzer, J. Marques, Kamal K. Seth, J. Schultz, A. Migliori, A. Hahn, V. Bharadwaj, W. Marsh, Giorgio Borreani, T. K. Pedlar, L. Pesando, A. Gianoli, J. Fast, C. M. Ginsburg, R. Cester, M. Martini, Eleonora Luppi, M. Mandelkern, Y. Zhang, M. Masuzawa, S. Pordes, R.A. Lewis, S. J. Werkema, S. Palestini, T. A. Armstrong, F. Marchetto, D. Dimitroyannis, M. Sarmiento, M. Hasan, A. M. Majewska, Marco Pallavicini, Mauro Marinelli, A. Santroni, D. Bettoni, M. Church, Roberto Calabrese, J. Peoples, R. Dibenedetto, R. Mussa, J. Zhao, and M. Savrie

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, antiproton, proton, forward scattering, Proton, Scattering, Forward scatter, NO, Momentum, PBARP, Recoil, Antiproton, Atomic physics, Small-angle scattering, Nuclear Experiment
Abstract

Differential cross sections for p p elastic scattering have been measured for very small momentum transfers at six different incident antiproton momenta in the range 3.7 to 6.2 GeV/c by the detection of recoil protons at scattering angles close to 90°. Forward scattering parameters σ T , b , and ϱ have been determined. For the ϱ-parameter, up to an order of magnitude higher level of precision has been achieved compared to that in earlier experiments. It is found that existing dispersion theory predictions are in disagreement with our results for the ϱ-parameter.

11. Commissioning of Fermilab's electron cooling system for 8-GeV antiprotons

Author

D. Broemmelsiek, V. Tupikov, T. Kroc, S. Pruss, A. Shemyakin, J. Leibfritz, S. Seletsky, B. Kramper, G. Saewert, G.K. Budker, C. Gattuso, K. Carlson, W. Gai, M. Hu, C.W. Schmidt, Sergei Nagaitsev, A. Warner, M. Sutherland, L. Prost, and Alexey Burov

Subjects
Physics, Physics::Instrumentation and Detectors, Tevatron, Particle accelerator, law.invention, Nuclear physics, law, Antiproton, Water cooling, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics, Fermilab, Nuclear Experiment, Collider, Storage ring, Electron cooling
Abstract

A 4.3-MeV electron cooling system [1] has been installed at Fermilab in the Recycler antiproton storage ring and is currently being commissioned. The cooling system is designed to assist accumulation of 8.9-GeV/c antiprotons for the Tevatron collider operations. This paper reports on the progress of the electron beam commissioning effort as well as on detailed plans of demonstrating the cooling of antiprotons.

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