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212 results on '"Pontecorvo, G. B."'

1. Resonant behaviour in double charge exchange reaction of \pi^+ mesons on the nuclear photoemulsion

Author

Batusov, Yu. A., Blokhintseva, T. D., Balestra, F., Bussa, M. P., Piragino, G., Pontecorvo, G. B., and Schepkin, M. G.

Subjects
High Energy Physics - Phenomenology
Abstract

The invariant mass spectra of the $pp\pi^-$ and $pp$ systems produced in the double charge exchange (DCX) of positively charged pions on photoemulsion are analysed. A pronounced peak is observed in the $pp\pi^-$ invariant mass spectrum, while the $M_{pp}$ spectrum exhibits a strong Migdal-Watson effect of the proton-proton final state interaction. These findings are in favor of the $NN$-decoupled $NN\pi$ pseudoscalar resonance with T=0 called $d'$., Comment: 13 pages, 5 figures, revised version

Published
2005
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2. $\phi$ and $\omega$ Meson Production in pp Reactions at $p_{lab}$=3.67 GeV/c

Author

DISTO Collaboration, Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Choi, Seonho, Debowski, M., Dressler, R., Dzemidzic, M., Faivre, J. -Cl., Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Froehlich, I., Frolov, V., Garfagnini, R., Grasso, A., Grosse, E., Heinz, S., Ivanov, V. V., Jacobs, W. W., Kuehn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H. -W., Piragino, G., Pontecorvo, G. B., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., Tosello, F., Vigdor, S. E., and Zosi, G.

Subjects
Nuclear Experiment
Abstract

The exclusive production cross sections for $\omega$ and $\phi$ mesons have been measured in proton-proton reactions at $p_{lab}=3.67$ GeV/c. The observed $\phi/\omega$ cross section ratio is $(3.8\pm0.2^{+1.2}_{-0.9})\times 10^{-3}$. After phase space corrections, this ratio is enhanced by about an order of magnitude relative to naive predictions based upon the Okubo-Zweig-Iizuka (OZI) rule, in comparison to an enhancement by a factor $\sim 3$ previously observed at higher beam momenta. The modest increase of this enhancement near the production threshold is compared to the much larger increase of the $\phi/\omega$ ratio observed in specific channels of $\bar pp$ annihilation experiments. Furthermore, differential cross section results are also presented which indicate that although the $\phi$ meson is predominantly produced from a $^3P_1$ proton-proton entrance channel, other partial waves contribute significantly to the production mechanism at this beam momentum., Comment: Revtex 49 pages, 11 figures, Phys Rev C in print

Published
2000
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3. Production of $\eta\prime$ Mesons in the $pp \to pp\eta\prime$ Reaction at 3.67 GeV/c

Author

Disto Collaboration, Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Choi, Seonho, Debowski, M., Dzemidzic, M., Faivre, J. -Cl., Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Froehlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Ivanov, V. V., Jacobs, W. W., Kuehn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H. -W., Piragino, G., Pontecorvo, G. B., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., Tosello, F., Vigdor, S. E., and Zosi, G.

Subjects
Nuclear Experiment
Abstract

The ratio of the total exclusive production cross sections for $\eta\prime$ and $\eta$ mesons has been measured in the $pp$ reaction at $p_{beam}=3.67$ GeV/c. The observed $\eta\prime/\eta$ ratio is $(0.83\pm{0.11}^{+0.23}_{-0.18})\times 10^{-2}$ from which the exclusive $\eta\prime$ meson production cross section is determined to be $(1.12\pm{0.15}^{+0.42}_{-0.31})\mu b$. Differential cross section distributions have been measured. Their shape is consistent with isotropic $\eta\prime$ meson production., Comment: 14 pages, 5 figures, accepted by Phys.Lett.B

Published
2000
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4. K$^-$ Meson Production in the Proton-Proton Reaction at 3.67 GeV/c

Author

DISTO collaboration, Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Tchalyshev, V., Choi, Seonho, Debowski, M., Dzemidzic, M., Faivre, J. Cl., Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Froehlich, I., Frolov, V., Garfagnini, R., Gill, D., Grasso, A., Grosse, E., Heinz, S., Ivanov, V. V., Jacobs, W. W., Kuehn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H. W., Piragino, G., Pontecorvo, G. B., Popov, A., Ritman, J., Salabura, P., Tosello, F., Vigdor, S. E., and Zosi, G.

Subjects
Nuclear Experiment
Abstract

The total cross section of the reaction $pp\to ppK^+K^-$ has been determined for proton--proton reactions with $p_{beam}=3.67 GeV/c$. This represents the first cross section measurement of the $pp \to ppK^-K^+$ channel near threshold, and is equivalent to the inclusive $pp\to ppK^-X$ cross section at this beam momentum. The cross section determined at this beam momentum is about a factor 20 lower than that for inclusive $pp\to ppK^+X$ meson production at the same CM energy above the corresponding threshold. This large difference in the $K^+$ and $K^-$ meson inclusive production cross sections in proton-proton reactions is in strong contrast to cross sections measured in sub-threshold heavy ion collisions, which are similar in magnitude at the same energy per nucleon below the respective thresholds., Comment: 12 pages, 3 figures Phys. Lett. B in print

Published
1999
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5. Spin Transfer in Exclusive Lambda Production from pp Collisions at 3.67 GeV/c

Author

DISTO Collaboration, Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chalyshev, V., Choi, Seonho, Debowski, M., Dzemidzic, M., Faivre, J. -Cl., Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Frolov, V., Garfagnini, R., Gill, D., Grasso, A., Heinz, S., Ivanov, V. V., Jacobs, W. W., Kuehn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H. -W., Piragino, G., Pontecorvo, G. B., Popov, A., Ritman, J., Salabura, P., Tosello, F., Vigdor, S. E., and Zosi, G.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

We report the first polarization transfer measurements for exclusive hyperon production reactions. The normal spin transfer coefficient DNN for pp -> p K+ Lambda is large and negative for forward Lambda production at a beam momentum of 3.67 GeV/c, a result qualitatively consistent with expectations for a mechanism dominated by kaon-exchange and rescattering. The sign of DNN is opposite to that observed in the fragmentation regime for inclusive Lambda production at much higher energies., Comment: 4 pages, including 4 figures. To be published in PRL

Published
1999
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6. New Measurement of Pontecorvo Reaction Using the Obelix Spectrometer

Author

Adamo, A., Agnello, M., Balestra, F., Belli, G., Bendiscioli, G., Bertin, A., Boccaccio, P., Bonazzola, G., Bressani, T., Bruschi, M., Bussa, M. P., Busso, L., Calvo, D., Capponi, M., Corradini, M., Costa, S., De Castro, S., D’Isep, F., Falomkin, I. V., Fava, L., Feliciello, A., Ferrero, L., Filippini, V., Garfagnini, R., Gastaldi, U., Gianotti, P., Grasso, A., Guaraldo, C., Iazzi, F., Lanaro, A., Lodi Rizzini, E., Lombardi, M., Maggiora, A., Marcello, S., Marconi, U., Margagliotti, G. V., Maron, G., Masoni, A., Massa, I., Minetti, B., Morando, M., Morganti, M., Panzieri, D., Pauli, G., Piccinini, M., Piragino, G., Poli, M., Pontecorvo, G. B., Puddu, G., Ricci, R. A., Rotondi, A., Rozhdestvensky, A. M., Salvini, P., Santi, L., Sapozhnikov, M. G., Semprini Cesari, N., Serci, S., Temnikov, P., Tessaro, S., Tosello, F., Tretyak, V. I., Vannucci, L., Vedovato, G., Venturelli, L., Vitale, A., Zenoni, A., Zoccoli, A., Zosi, G., Mitter, H., editor, Plessas, W., editor, Truhlík, Emil, editor, and Mach, Rostislav, editor

Published
1992
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8. Spin physics with antiprotons

Author

Maggiora, M., Abazov, V., Alexeev, G., Alexeev, M., Amoroso, A., Angelov, N., Baginyan, S., Balestra, F., Baranov, V. A., Batusov, Yu., Belolaptikov, I., Bertini, R., Bianconi, A., Birsa, R., Blokhintseva, T., Bonyushkina, A., Bradamante, F., Bressan, A., Bussa, M. P., Butenko, V., Colantoni, M., Corradini, M., Torre, S. Dalla, Demyanov, A., Denisov, O., Drozdov, V., Dupák, J., Erusalimtsev, G., Fava, L., Ferrero, A., Ferrero, L., Finger, Jr., M., Finger, M., Frolov, V., Garfagnini, R., Giorgi, M., Kalinnikov, V. A., Kharzheev, Yu., Khomutov, N. V., Kirilov, A., Kisselev, Yu., Komissarov, E., Korenchenko, A. S., Kotzinian, A., Kovalenko, V., Kravchuk, N. P., Kuchinski, N. A., Rizzini, E. Lodi, Lyashenko, V., Maggiora, A., Malyshev, V., Martin, A., Merekov, Yu., Moiseenko, A. S., Olchevski, A., Panyushkin, V., Panzieri, D., Piragino, G., Pontecorvo, G. B., Popov, A., Porokhovoy, S., Pryanichnikov, V., Radici, M., Rekalo, M. P., Rozhdestvensky, A., Russakovich, N., Schiavon, P., Shevchenko, O., Shishkin, A., Sidorkin, V. A., Skachkov, N., Slunecka, M., Srnka, A., Tchalyshev, V., Tessarotto, F., Tomasi-Gustafsson, E., Tosello, F., Velicheva, E. P., Venturelli, L., Vertogradov, L., Virius, M., Zosi, G., and Zurlo, N.

Published
2005
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10. New Measurement of Pontecorvo Reaction $$\overline{\text{p}}\text{d}\to {{\text{ }\!\!\pi\!\!\text{ }}^{\text{-}}}\text{p}$$ Using the Obelix Spectrometer

Author

Adamo, A., primary, Agnello, M., additional, Balestra, F., additional, Belli, G., additional, Bendiscioli, G., additional, Bertin, A., additional, Boccaccio, P., additional, Bonazzola, G., additional, Bressani, T., additional, Bruschi, M., additional, Bussa, M. P., additional, Busso, L., additional, Calvo, D., additional, Capponi, M., additional, Corradini, M., additional, Costa, S., additional, De Castro, S., additional, D’Isep, F., additional, Falomkin, I. V., additional, Fava, L., additional, Feliciello, A., additional, Ferrero, L., additional, Filippini, V., additional, Garfagnini, R., additional, Gastaldi, U., additional, Gianotti, P., additional, Grasso, A., additional, Guaraldo, C., additional, Iazzi, F., additional, Lanaro, A., additional, Lodi Rizzini, E., additional, Lombardi, M., additional, Maggiora, A., additional, Marcello, S., additional, Marconi, U., additional, Margagliotti, G. V., additional, Maron, G., additional, Masoni, A., additional, Massa, I., additional, Minetti, B., additional, Morando, M., additional, Morganti, M., additional, Panzieri, D., additional, Pauli, G., additional, Piccinini, M., additional, Piragino, G., additional, Poli, M., additional, Pontecorvo, G. B., additional, Puddu, G., additional, Ricci, R. A., additional, Rotondi, A., additional, Rozhdestvensky, A. M., additional, Salvini, P., additional, Santi, L., additional, Sapozhnikov, M. G., additional, Semprini Cesari, N., additional, Serci, S., additional, Temnikov, P., additional, Tessaro, S., additional, Tosello, F., additional, Tretyak, V. I., additional, Vannucci, L., additional, Vedovato, G., additional, Venturelli, L., additional, Vitale, A., additional, Zenoni, A., additional, Zoccoli, A., additional, and Zosi, G., additional

Published
1992
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13. Annihilation of Antiprotons at Rest in 3He and 4He

Author

Balestra, F., Batusov, Y. A., Bendiscioli, G., Bossolasco, S., Breivik, F. O., Bunyatov, S. A., Bussa, M. P., Busso, L., Falomkin, I. V., Fava, L., Ferrero, L., Guaraldo, C., Haatuft, A., Halsteinslid, A., Jacobsen, T., Lodi Rizzini, E., Maggiora, A., Myklebost, K., Nichitiu, F., Olsen, J. M., Panzieri, D., Piragino, G., Pontecorvo, G. B., Rotondi, R., Salvini, P., Sapozhnikov, M. G., Sorensen, S. O., Tosello, F., Tretyak, V. I., Zenoni, A., Mitter, H., editor, Plessas, W., editor, Ballot, Jean-Louis, editor, and Fabre de la Ripelle, Michel, editor

Published
1987
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14. K− meson production in the proton–proton reaction at 3.67 GeV/c

Author

DISTO collaboration, Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Tchalyshev, V., Choi, Seonho, Debowski, M., Dzemidzic, M., Faivre, J. Cl., Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Froehlich, I., Frolov, V., Garfagnini, R., Gill, D., Grasso, A., Grosse, E., Heinz, S., Ivanov, V. V., Jacobs, W. W., Kuehn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H. W., Piragino, G., Pontecorvo, G. B., Popov, A., Ritman, J., Salabura, P., Tosello, F., Vigdor, S. E., and Zosi, G.

Subjects
Physics, Nuclear and High Energy Physics, Meson production, Proton, Meson, Nuclear Theory, FOS: Physical sciences, Nuclear physics, Momentum, Cross section (physics), Near threshold, Physics::Accelerator Physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nucleon, Beam (structure)
Abstract

The total cross section of the reaction $pp\to ppK^+K^-$ has been determined for proton--proton reactions with $p_{beam}=3.67 GeV/c$. This represents the first cross section measurement of the $pp \to ppK^-K^+$ channel near threshold, and is equivalent to the inclusive $pp\to ppK^-X$ cross section at this beam momentum. The cross section determined at this beam momentum is about a factor 20 lower than that for inclusive $pp\to ppK^+X$ meson production at the same CM energy above the corresponding threshold. This large difference in the $K^+$ and $K^-$ meson inclusive production cross sections in proton-proton reactions is in strong contrast to cross sections measured in sub-threshold heavy ion collisions, which are similar in magnitude at the same energy per nucleon below the respective thresholds., 12 pages, 3 figures Phys. Lett. B in print

Published
1999

15. Restriction on amount of antimatter in the early universe from $$\bar p^{ - 4} $$ He reaction data-4He reaction data

Author

Batusov, Yu. A., Falomkin, I. V., Pontecorvo, G. B., Sapozhnikov, M. G., Guaraldo, C., Maggiora, A., Vascon, M., Zanella, G., Bendiscioli, G., Filippini, V., Rizzini, E. Lodi, Rotondi, A., Zenoni, A., Balestra, F., Bussa, M. P., Busso, L., Ferrero, L., Gervino, G., Panzieri, D., Piragino, G., Tosello, F., and Dubna-Frascati-Padova-Pavia-Torino Collaboration

Published
1984
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27. Light nucleus production in $$\bar p^4 $$ He annihilation between 0 and 600 MeV/cHe annihilation between 0 and 600 MeV/c

Author

Balestra, F., Bossolasco, S., Bussa, M. P., Busso, L., Fava, L., Ferrero, L., Panzieri, D., Piragino, G., Tosello, F., Barbieri, R., Bendiscioli, G., Rotondi, R., Salvini, P., Zenoni, A., Batusov, Yu. A., Falomkin, I. V., Nichitiu, F., Pontecorvo, G. B., Sapozhnikov, M. G., Tretyak, V. I., Guaraldo, C., Maggiora, A., Rizzini, E. Lodi, Haatuft, A., Halsteinslid, A., Myklebost, K., Olsen, J. M., Breivik, F. O., Jacobsen, T., and Sørensen, S. O.

Published
1988
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32. Low energy antiproton annihilation on nuclei

Author

Balestra, F., Batusov, Yu. A., Bendiscioli, G., Bessolasco, S., Buniatov, S. A., Bussa, M. P., Busso, L., Falomkin, I. V., Ferrero, L., Filippini, V., Fumagalli, G., Grasso, A., Guaraldo, C., Rizzini, E. Lodi, Maggiora, A., Marciano, C., Panzieri, D., Piragino, G., Pontecorvo, G. B., Rotondi, A., Sapozhnikov, M. G., Tosello, F., Vascone, M., Zanella, G., and Zenoni, A.

Published
1986
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34. Non elastic interaction of π+ mesons on 4He at 120, 145 and 165 MeV

Author

Balestra, F., primary, Bussa, M. P., additional, Busso, L., additional, Garfagnini, R., additional, Piragino, G., additional, Zanini, A., additional, Guaraldo, C., additional, Maggiora, A., additional, Scrimaglio, R., additional, Falomkin, I. V., additional, Pontecorvo, G. B., additional, and Shcherbakov, Yu. A., additional

Published
1978
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35. Annihilation of Antiprotons at Rest in 3He and 4He

Author

Balestra, F., primary, Batusov, Y. A., additional, Bendiscioli, G., additional, Bossolasco, S., additional, Breivik, F. O., additional, Bunyatov, S. A., additional, Bussa, M. P., additional, Busso, L., additional, Falomkin, I. V., additional, Fava, L., additional, Ferrero, L., additional, Guaraldo, C., additional, Haatuft, A., additional, Halsteinslid, A., additional, Jacobsen, T., additional, Lodi Rizzini, E., additional, Maggiora, A., additional, Myklebost, K., additional, Nichitiu, F., additional, Olsen, J. M., additional, Panzieri, D., additional, Piragino, G., additional, Pontecorvo, G. B., additional, Rotondi, R., additional, Salvini, P., additional, Sapozhnikov, M. G., additional, Sorensen, S. O., additional, Tosello, F., additional, Tretyak, V. I., additional, and Zenoni, A., additional

Published
1987
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36. Resonant behaviour in double charge exchange reaction of ��^+ mesons on the nuclear photoemulsion

Author

Batusov, Yu. A., Blokhintseva, T. D., Balestra, F., Bussa, M. P., Piragino, G., Pontecorvo, G. B., and Schepkin, M. G.

Subjects
High Energy Physics - Phenomenology (hep-ph), Nuclear Theory, FOS: Physical sciences
Abstract

The invariant mass spectra of the $pp��^-$ and $pp$ systems produced in the double charge exchange (DCX) of positively charged pions on photoemulsion are analysed. A pronounced peak is observed in the $pp��^-$ invariant mass spectrum, while the $M_{pp}$ spectrum exhibits a strong Migdal-Watson effect of the proton-proton final state interaction. These findings are in favor of the $NN$-decoupled $NN��$ pseudoscalar resonance with T=0 called $d'$., 13 pages, 5 figures, revised version

Published
2005
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37. Vector meson production at 3.67-GeV/c

Author

Grasso, Antonino, Maggiora, Marco, Bussa, Maria Pia, Balestra, Ferruccio, Bedfer, Y., Bertini, Raimondo Pietro, Bland, L. C., Brenschede, A., Brochard, F., Seonho, Choi, Colantoni, M., Dressler, R., Dzemidzic, M., Faivre, J. C. l., Fava, Luciano, Ferrero, Andrea, Ferrero, Livio, Foryciarz, J., Frglich, I., Frolov, Vladimir, Garfagnini, Raffaello, Heinz, S., Jacobs, W. W., Kiihn, W., Maggiora, A., Manara, A., Panzieri, Daniele, Pfaff, H. W., Piragino, Guido, Pontecorvo, G. B., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., Tosello, F., Vigdor, S. E., and Zosi, Gianfranco

Published
2003

38. Searches for d' resonance in double charge exchange reactions of pi sup + -mesons on nuclei in nuclear photoemulsion

Author

Batusov, Y A, Balestra, F, Bussa, M P, Piragino, G, and Pontecorvo, G B

Subjects
Nuclear Theory, Nuclear Experiment, Particle Physics
Abstract

797 events have been analyzed in double charge exchange (DCX) reactions of pi sup + -mesons registered in photoemulsion chambers exposed to positive pion beams of the phasotron of the Dzhelepov Laboratory of Nuclear Problems (JINR) at energies of 80-140 MeV. The effective invariant mass of the secondary pi sup - -meson and the two protons was determined for each three-prong event identified within the energy range of the incident pi sup + -meson between 72 and 140 MeV. The spectrum of effective masses reveals a peak in the 2060-2072 MeV interval with a mean value equal to M sub e sub f sub f =(2065.5+-3.6)MeV. The obtained value of M sub e sub f sub f is in a good agreement with the mass of the d' resonance hypothesized in 'QCD-string' model calculations and confirmed by measurements of the dependence on the incident energy of the DCX cross sections of pi sup + -mesons on nuclei and in pp->pp pi sup -pi sup + process

Published
2002

39. Antineutron-Nucleus annihilation

Author

Adamo, A. A., Agnello, Michelangelo, Balestra, F., Belli, G., Bendiscioli, G., Bertin, A., Boccaccio, P., Bonazzola, G. C., Bressani, T., Bruschi, M., Bussa, M. P., Busso, L., Calvo, D., Capponi, M., Corradini, M., Costa, S., DE CASTRO, S., D'Isep, D., Falomkin, I. V., Fava, L., Feliciello, A., Ferrero, L., Filippini, V., Garfagnini, R., Gastaldi, U., Gianotti, P., Grasso, A., Guaraldo, C., Iazzi, Felice, Lanaro, A., LODI RIZZINI, E., Lombardi, M., Macciotta, M. P., Maggiora, A., Marcello, S., Marconi, U., Margagliotti, G. V., Maron, G., Masala, M., Masoni, A., Massa, I., Minetti, B., Morando, M., Morganti, M., Panzieri, D., Pauli, G., Piccinini, M., Piragino, R., Poli, M., Pontecorvo, G. B., Puddu, G., Ricci, R. A., Rotondi, A., Rozhdestvensky, A. M., Salvini, P., Santi, L., Sapozhnikov, M. G., Sartori, G., SEMPRINI CESARI, N., Serci, S., Tosello, F., Tretyak, V. I., Vannucci, L., Vedovato, G., Venturelli, L., Vitale, A., Zenoni, A., and Zosi, A. ZOCCOLI AND G.

Published
2001

40. Meson production in p p reactions at 2.85-GeV

Author

Grasso, Antonino, Kuhn, W., Baginyan, S. A., Balestra, Ferruccio, Bedfer, Y., Bertini, Raimondo Pietro, Bland, L. C., Bonushkina, A. Y., Brochard, F., Bussa, Maria Pia, Chalyshev, V., Choi, S., Debowski, M., Dressler, R., Dzemidzic, M., Faivre, J. C., Falomkin, I. V., Fava, Luciano, Ferrero, Livio, Foryciarz, J., Frolov, Vladimir, Frohlich, I., Garfagnini, Raffaello, Heinz, S., Ivanov, V. V., Jacobs, W. W., Maggiora, A., Maggiora, Marco, Manara, A., Panzieri, Daniele, Pfaff, H. W., Piragino, Guido, Pontecorvo, G. B., Popov, A., Ritman, J., Rozhdestvensky, A. M., Salabura, P., Tosello, F., Vigdor, S. E., and Zosi, Gianfranco

Published
2001

41. Resonant and non Resonant K--Production in pp Reactions at 2.85 GeV

Author

Ritman, J., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussab, M. P., Choi, S., Debowski, M., Dressler, R., Dzemidzic, M., Faivre, J.-C., Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., Grosse, E., Heinz, S., Ivanov, V. V., Jacobs, W. W., Kühn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H.-W., Piragino, G., Pontecorvo, G. B., Popov, A., Salabura, P., Tchalyshev, V., Tosello, F., Vigdor, S. E., and Zosi, G.

Abstract

Inclusive and exclusive (i.e. via the f resonance) K- meson production cross sections have been measured in proton-proton reactions at Tbeam = 2.85 GeV. The inclusive K- cross section is about a factor 20 lower than the K+ cross sections at the same available energy above threshold. The observed f/w cross section ratio is enhanced by about an order of magnitude relative to naive predictions based upon the Okubo-Zweig-Iizuka (OZI) rule. Differential cross section results are presented which indicate significant contributions from higher partial waves in the proton-proton entrance channel.

Published
2001

42. Φ and ω Meson Production in pp Reactions at plab=3.67 GeV/c

Author

Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Choi, S., Debowski, M., Dressler, R., Dzemidzic, M., Faivre, J. -Cl, Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., Grosse, E., Heinz, S., Ivanov, V. V., Jacobs, W. W., Kühn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H. -W, Piragino, G., Pontecorvo, G. B., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., Flavio Tosello, Vigdor, S. E., and Zosi, G.

Abstract

The exclusive production cross sections for ω and Φ mesons have been measured in proton-proton reactions at plab=3.67 GeV/c. The observed Φ/ω cross section ratio is (3.8±0.2+1.2-0.9)×10-3. After phase space corrections, this ratio is enhanced by about an order of magnitude relative to naive predictions based upon the Okubo-Zweig-Iizuka (OZI) rule, in comparison to an enhancement by a factor ~ 3 previously observed at higher beam momenta. The modest increase of this enhancement near the production threshold is compared to the much larger increase of the Φ/ω ratio observed in specific channels of pp annihilation experiments. Furthermore, differential cross section results are also presented which indicate that although the Φ meson is predominantly produced from a 3P1 proton-proton entrance channel, other partial waves contribute significantly to the production mechanism at this beam momentum.

Published
2001

43. Meson and hyperon production results from the DISTO spectrometer at SATURNE

Author

Salabura, P., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brochard, F., Bussa, M. P., Chalyshev, V., Choi, S., Dzemidzic, M., Faivre, J. -Cl, Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Frolov, V., Fröhlich, I., Garfagnini, R., Gill, D., Grasso, A., Heinz, S., Ivanov, V. V., Jacobs, W. W., Kühn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H. -W, Piragino, G., Pontecorvo, G. B., Popov, A., Ritmann, J., Flavio Tosello, Vigdor, S. E., and Zosi, G.

Subjects
SPIN TRANSFER, PROTON-PROTON COLLISIONS, NUCLEUS-NUCLEUS COLLISIONS, TOTAL CROSS-SECTION, NEAR-THRESHOLD, PHI-MESON, OZI-RULE, ETA' PRODUCTION, SIGMA-TERM, (P)OVER-BAR-P ANNIHILATION
Published
2000

44. Meson spectroscopy with the OBELIX apparatus

Author

Vecchi, S., Adamo, [. A. A., Agnello, Michelangelo, Balestra, F., Belli, G., Bendiscioli, G., Bertin, A., Boccaccio, P., Bonazzola, G. C., Bressani, T., Bruschi, M., Bussa, M. P., Busso, L., Calvo, D., Capponi, M., Corradini, M., Costa, S., DE CASTRO, S., D'Isep, D., Falomkin, I. V., Fava, L., Feliciello, A., Ferrero, L., Filippini, V., Garfagnini, R., Gastaldi, U., Gianotti, P., Grasso, A., Guaraldo, C., Iazzi, Felice, Lanaro, A., LODI RIZZINI, E., Lombardi, M., Macciotta, M. P., Maggiora, A., Marcello, S., Marconi, U., Margagliotti, G. V., Maron, G., Masala, M., Masoni, A., Massa, I., Minetti, Bruno, Morando, M., Morganti, M., Panzieri, D., Pauli, G., Piccinini, M., Piragino, R., Poli, M., Pontecorvo, G. B., Puddu, G., Ricci, R. A., Rotondi, A., Rozhdestvensky, A. M., Salvini, P., Santi, L., Sapozhnikov, M. G., Sartori, G., SEMPRINI CESARI, N., Serci, S., Tosello, F., Tretyak, V. I., Vannucci, L., Vedovato, G., Venturelli, L., Vitale, A., Zenoni, A., Zoccoli, A., and Zosi], G.

Subjects
Physics, Rest (physics), Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Channel analysis, Spectroscopy
Abstract

The main features of the coupled channel analysis and some physical results of the annihilation reaction at rest pp -+ 1("+1("-1("0, K+K-1("° and K±K~1("'F at three different target densities are discussed.

Published
2000

45. Spin Transfer in Exclusive <font face=symbol>L</font> Production from pp Collisions at 3.67 GeV/c

Author

Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chalyshev, V., Seonho, C., Debowski, M., Dzemidzic, M., Faivre, J.-C., Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Frolov, V., Garfagnini, R., Gill, D., Grasso, A., Heinz, S., Ivanov, V. V., Jacobs, W. W., Kühn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H.-W., Piragino, G., Pontecorvo, G. B., Popov, A., Ritman, J., Salabura, P., Tosello, F., Vigdor, S. E., and Zosi, G.

Abstract

We report the first polarization transfer measurements for exclusive hyperon production reactions. The normal spin transfer coefficient DNN for pp®pK+K-L is large and negative for forward L production at a beam momentum of 3.67GeV/c, a result qualitatively consistent with expectations for a mechanism dominated by kaon-exchange and rescattering. The sign of DNN is opposite to that observed in the fragmentation regime for inclusive L production at much higher energies.

Published
1999

46. A Large Acceptance Multiparticle Spectrometer for 1-3 GeV Proton Beams

Author

Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chalyshev, V., Seonho, C., Debowski, M., Dzemidzic, M., Faivre, J. C., Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Frolov, V., Garfagnini, R., Gill, D., Grasso, A., Grosse, E., Heinz, S., Jacobs, W. W., Kühn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H. W., Piragino, G., Pontecorvo, G. B., Popov, A., Ritman, J., Salabura, P., Senger, P., Stroth, J., Tosello, F., Vigdor, S. E., Zalikhanov, B., and Zosi, G.

Subjects
Physics::Instrumentation and Detectors, High Energy Physics::Experiment, Nuclear Experiment
Abstract

A magnetic spectrometer system has been constructed for the study of reactions with multiple charged particles in the final state, induced by polarized proton beams of few GeV energy. The system is based on a large-gap dipole magnet, with a liquid hydrogen target and scintillating fiber tracking detectors embedded inside the magnet. Multiwire proportional chambers, plastic scintillator hodoscopes, and threshold Cerenkov detectors placed outside the magnet provide additional tracking, triggering and particle identification capabilities. The system has been applied to study exclusive hyperon as well as pseudoscalar and vector meson production reactions at bombarding energies below 3 GeV. Additionally, it has been used to monitor the proton beam polarization at Laboratoire National Saturne. The components and performance of the system are reported.

Published
1998

47. Production of Φ and ω Mesons in Near Threshold pp Reactions

Author

Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chalyshev, V., Seonho, C., Debowski, M., Dzemidzic, M., Faivre, J.-C., Falomkin, I. V., Fava, L., Ferrero, L., Foryciarz, J., Frolov, V., Garfagnini, R., Gill, D., Grasso, A., Grosse, E., Heinz, S., Ivanov, V. V., Jacobs, W. W., Kühn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H.-W., Piragino, G., Pontecorvo, G. B., Popov, A., Ritman, J., Salabura, P., Senger, P., Stroth, J., Tosello, F., Vigdor, S. E., and Zosi, G.

Abstract

The ratio of the exclusive production cross sections for Φ and ω mesons has been measured in pp reactions at Tbeam = 2.85 GeV. The observed f/w ratio is (3.7±0.7+1.2-0.9)×10-3. After phase space corrections, this ratio is about a factor 10 enhanced relative to naive predictions based upon the Okubo-Zweig-Iizuka (OZI) rule, in comparison to an enhancement by a factor ~ 3 previously observed at higher energies. The modest increase of this enhancement near the production threshold is compared to the much larger increase of the Φ/ω ratio observed in specific channels of ` >pp annihilation experiments.

Published
1998

49. Non elastic interaction of π+ mesons on 4He at 120, 145 and 165 MeV

Author

Balestra, F., Bussa, M. P., Busso, L., Garfagnini, R., Piragino, G., Zanini, A., Guaraldo, C., Maggiora, A., Scrimaglio, R., Falomkin, I. V., Pontecorvo, G. B., Shcherbakov, Yu. A., Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Zittartz, J., editor, Beiglböck, W., editor, Zingl, H., editor, Haftel, M., editor, and Zankel, H., editor

Published
1978
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50. The two-body final state from anti-NN annihilation in gaseus hydrogen and the S/P wave problem

Author

Ablev, V. G., Adamo, A., Andrighetto, A., Agnello, Michelangelo, Balestra, F., Belli, G., Bendiscioli, G., Bertin, A., Boccaccio, P., Bonazzola, G. C., Bressani, T., Bruschi, M., Bussa, M. P., Busso, L., Calvo, D., Capponi, M., Corradini, M., Costa, S., DE CASTRO, S., D'Isep, D., Falomkin, I. V., Fava, L., Feliciello, A., Ferrero, L., Filippini, V., Garfagnini, R., Gastaldi, U., Gianotti, P., Grasso, A., Guaraldo, C., Iazzi, Felice, Lanaro, A., LODI RIZZINI, E., Lombardi, M., Macciotta, M. P., Maggiora, A., Marcello, S., Marconi, U., Margagliotti, G. V., Maron, G., Masala, M., Masoni, A., Massa, I., Minetti, B., Morando, M., Morganti, M., Panzieri, D., Pauli, G., Piccinini, M., Piragino, R., Poli, M., Pontecorvo, G. B., Puddu, G., Ricci, R. A., Rotondi, A., Rozhdestvensky, A. M., Salvini, P., Santi, L., Sapozhnikov, M. G., Sartori, G., SEMPRINI CESARI, N., Serci, S., Tosello, F., Tretyak, V. I., Vannucci, L., Vedovato, G., Venturelli, L., Vitale, A., Zenoni, A., and Zosi, A. ZOCCOLI AND G.

Published
1994

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