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237 results on '"Brenschede, A."'

1. Formation of the $S=-1$ resonance X(2265) in the reaction $pp -> X + K^+$ at 2.50 and 2.85 GeV

Author

Kienle, P., Maggiora, M., Suzuki, K., Yamazaki, T., Alexeev, M., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chiosso, M., Choi, Seonho, Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. -Cl., Ferrero, A., Ferrero, L., Foryciarz, J., Froehlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kuehn, W., Maggiora, A., Panzieri, D., Pfaff, H. -W., Pontecorvo, G., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., Tosello, F., Vigdor, S. E., and Zosi, G.

Subjects
Nuclear Experiment
Abstract

Analyzing DISTO data of $pp -> p Lambda K^+$ at $T_p = 2.50$ and 2.85 GeV to populate a previously reported X(2265) resonance with $M_X = 2267$ MeV/$c^2$ and $Gamma_X = 118$ MeV at 2.85 GeV, we found that the production of X(2265) at 2.50 GeV is much less than that at 2.85 GeV (less than 10%), though it is expected from a kinematical consideration to be produced as much as 33% of that at 2.85 GeV. The small population of X(2265) at 2.50 GeV is consistent with the very weak production of Lambda (1405) at the same incident energy toward its production threshold, thus indicating that Lambda (1405) plays an important role as a doorway state for the formation of X(2265)., Comment: 5 pages, 4 figures

Published
2011
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2. Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda K+ reaction at 2.85 GeV

Author

Yamazaki, T., Maggiora, M., Kienle, P., Suzuki, K., Amoroso, A., Alexeev, M., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Choi, Seonho, Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. -Cl., Ferrero, L., Foryciarz, J., Froehlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kuhn, W., Maggiora, A., Panzieri, D., Pfaff, H. -W., Pontecorvo, G., Popov, A., Ritman, J., Salabura, P., Sosio, S., Tchalyshev, V., and Vigdor, S. E.

Subjects
Nuclear Experiment
Abstract

We have analyzed data of the DISTO experiment on the exclusive pp -> p Lambda K+ reaction at 2.85 GeV to search for a strongly bound compact K-pp (= X) state to be formed in the pp -> K+ + X reaction. The observed spectra of the K+ missing-mass and the p Lambda invariant-mass with high transverse momenta of p and K+ revealed a broad distinct peak with a mass M_X = 2265 +- 2 (stat) +- 5 (syst) MeV/c2 and a width Gamma_X = 118 +- 8 (stat) +- 10 (syst) MeV., Comment: 4 pages, 4 figures

Published
2010
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3. DISTO data on Kpp

Author

Maggiora, M., Kienle, P., Suzuki, K., Yamazaki, T., Collaboration, DISTO, Alexeev, M., Amoroso, A., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Choi, S., Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. Cl., Ferrero, L., Foryciarz, J., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kühn, W., Maggiora, A., Panzieri, D., Sosio, S., Pfaff, H. W., Pontecorvo, G., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., and Vigdor, S. E.

Subjects
High Energy Physics - Experiment
Abstract

The data from the DISTO Collaboration on the exclusive pp -> p K+ Lambda production acquired at T_p = 2.85 GeV have been re-analysed in order to search for a deeply bound K- pp (= X) state, to be formed in the binary process pp -> K+ X. The preliminary spectra of the DeltaM_{K+} missing-mass and of the M_{p Lambda} invariant-mass show, for large transverse-momenta of protons and kaons, a distinct broad peak with a mass M_X = 2265 +- 2 MeV/c^2 and a width Gamma_X = 118 +- 8 MeV/c^2., Comment: 8 pages, 4 figures. Talk presented at the "10th International Conference on Hypernuclear and Strange Particle Physics" (HYP-X), Tokai, Ibaraki, Japan, September 14th-18th, 2009. To appear in the proceedings

Published
2009
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4. Rho^0 meson production in the pp ->pppi+pi- reaction at 3.67 GeV/c

Author

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

Subjects
High Energy Physics - Experiment
Abstract

Total and differential cross sections for the exclusive reaction pp->pp rho^0 observed via the pi+pi- decay channel have been measured at beam momentum=3.67 GeV/c. The observed total meson production cross section is determined to be 23.4 +- 0.8 +-8 microb and is significantly lower than typical cross sections used in model calculations for heavy ion collisions. The differential cross sections measured indicate a strong anisotropy cos^2(theta^{CM}) in the rho^0 meson production., Comment: 3 figures, 11 pages

Published
2002
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5. $\phi$ 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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6. 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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7. 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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8. 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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9. Acceptance and resolution simulation studies for the dielectron spectrometer HADES at GSI

Author

Schicker, R., Brenschede, A., Garrow, K., Schoen, H., Balanda, A., Bokemeyer, H., Friese, J., Karig, W., Kienle, P., Koenig, W., Kuehn, W., Lefevre, F., Metag, V., Roche, G., Salabura, P., Schroeter, A., Stroth, J., and Tsertos, H.

Subjects
Nuclear Experiment
Abstract

Design studies for a second generation Dilepton Spectrometer to be built at the SIS accelerator of GSI are presented. The basic design parameters of this system are specified and the different detector components for charged particle tracking and for lepton identification are described. The geometrical acceptance for lepton pairs is given. Results on single track momentum resolution and on lepton pair mass resolution are reported., Comment: 36 pages, documentstyle[epsfig]{elsart}, 14 postscript figures (included); Submitted to NIM A

Published
1996
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10. Exclusive η production in pp reactions

Author

Fröhlich, I., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Choi, Seonho, Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J.-Cl., Ferrero, A., Ferrero, L., Foryciarz, J., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kühn, W., Maggiora, A., Maggiora, M., Manara, A., Panzieri, D., Pfaff, H.-W., Piragino, G., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., Tosello, F., Vigdor, S. E., Zosi, G., Elster, Charlotte, editor, Speth, Josef, editor, and Walcher, Thomas, editor

Published
2004
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12. DISTO data on [formula omitted]

Author

Maggiora, M., Kienle, P., Suzuki, K., Yamazaki, T., Alexeev, M., Amoroso, A., Balestra, F., Bedfer, Y., Bertini, R., Bland, L.C., Brenschede, A., Brochard, F., Bussa, M.P., Choi, S., Colantoni, M.L., Dressler, R., Dzemidzic, M., Faivre, J.Cl., Ferrero, L., Foryciarz, J., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W.W., Kühn, W., Maggiora, A., Panzieri, D., Sosio, S., Pfaff, H.W., Pontecorvo, G., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., and Vigdor, S.E.

Published
2010
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13. Formation of the S = -1 resonance X(2265) in the reaction pp → X+K+ at 2.50 and 2.85 GeV

Author

Kienle, P., Maggiora, M., Suzuki, K., Yamazaki, T., Alexeev, M., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chiosso, M., Choi, Seonho, Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. -Cl., Ferrero, A., Ferrero, L., Foryciarz, J., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kühn, W., Maggiora, A., Panzieri, D., Pfaff, H. -W., Pontecorvo, G., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., Tosello, F., Vigdor, S. E., and Zosi, G.

Published
2012
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14. First exclusive measurements of the K  −  pp state populated in the pp → K  +  Λp reaction at 2.85 GeV

Author

Yamazaki, T., Kienle, P., Suzuki, K., Maggiora, M., Alexeev, (M., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chiosso, M., Choi, Seonho, Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. -Cl., Ferrero, L., Foryciarz, J., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kühn, W., Maggiora, A., Panzieri, D., Pfaff, H. -W., Pontecorvo, G., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., Tosello, F., Vigdor, S. E., Zosi), G., and on behalf of DISTO Collaboration

Published
2009
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15. Exclusive $\eta$ production in pp reactions

Author

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

Published
2003
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16. Neutral meson production in p-Be and p-Au collisions at 450 GeV beam energy

Author

Agakichiev, G., Appenheimer, M., Averbeck, R., Ballester, F., Baur, R., Brenschede, A., Diaz, J., Drees, A., Faschingbauer, U., Ferrero, J.L., Fischer, P., Fraenkel, Z., Franke, M., Fuchs, Ch., Gatti, E., Glässel, P., Günzel, T., de los Heros, C.P., Hess, F., Holzmann, R., Irmscher, D., Jacob, C., Kühn, W., Lenkeit, B., Löhner, H., Marin, A., Marques, F.M., Martinez, G., Metag, V., Notheisen, M., Novotny, R., Olsen, L.H., Ostendorf, R., Panebrattsev, Y., Pfeiffer, A., Ravinovich, I., Rehak, P., Sampietro, M., Schön, A., Schukraft, J., Schutz, Y., Shimansky, S., Shor, A., Simon, R.S., Specht, H.J., Steiner, V., Tapprogge, S., Tel-Zur, G., Tserruya, I., Ullrich, T., Wilschut, H., Wurm, J.P., and Yurevich, V.

Published
1998
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17. Systematic study of low-mass electron pair production in p–Be and p–Au collisions at 450 GeV/ $c$

Author

Agakichiev, G., Appenheimer, M., Averbeck, R., Ballester, F., Baur, R., Brenschede, A., Diaz, J., Drees, A., Faschingbauer, U., Ferrero, J.L., Fischer, P., Fraenkel, Z., Franke, M., Fuchs, C., Gatti, E., Glässel, P., Günzel, T., de los Heros, C.P., Hess, F., Holzmann, R., Iourevitch, V., Irmscher, D., Jacob, C., Kühn, W., Lenkeit, B., Löhner, H., Marin, A., Marques, F.M., Martinez, G., Metag, V., Notheisen, M., Novotny, R., Olsen, L.H., Ostendorf, R., Panebrattsev, Y., Pfeiffer, A., Ravinovich, I., Rehak, P., Sampietro, M., Schön, A., Schukraft, J., Schutz, Y., Shimansky, S., Shor, A., Simon, R.S., Specht, H.J., Steiner, V., Tapprogge, S., Tel-Zur, G., Tserruya, I., Ullrich, T., Wilschut, H., and Wurm, J.P.

Published
1998
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18. First exclusive measurements of the K−pp state populated in the pp → K+ Λp reaction at 2.85 GeV

Author

Yamazaki, T., Kienle, P., Suzuki, K., Maggiora, M., Alexeev, M., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chiosso, M., Choi, Seonho, Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. -Cl., Ferrero, L., Foryciarz, J., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kühn, W., Maggiora, A., Panzieri, D., Pfaff, H. -W., Pontecorvo, G., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., Tosello, F., Vigdor, S. E., and Zosi, G.

Published
2009

19. Exclusive η production in pp reactions

Author

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

Published
2003
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20. The DISTO data acquisition system at SATURNE

Author

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

Subjects
Spectrometer -- Design and construction, Particle accelerators -- Equipment and supplies, Business, Electronics, Electronics and electrical industries
Abstract

The DISTO collaboration has built a large-acceptance magnetic spectrometer designed to provide broad kinematic coverage of multiparticle final states produced in pp scattering. The spectrometer has been installed in the polarized proton beam of the Saturne accelerator in Saclay to study polarization observables in the [Mathematical Expression Omitted] reaction and vector meson production ([Phi], [Omega] and [Rho]) in pp collisions. The data acquisition system is based on a VME 68030 CPU running the OS/9 operating system, housed in a single VME crate together with the CAMAC interface, the triple port ECL memories, and four RISC R3000 CPU. The digitization of signals from the detectors is made by PCOS III and FERA front-end electronics. Data of several events belonging to a single Saturne extraction are stored in VME triple-port ECL memories using a hardwired fast sequencer. The buffer, optionally filtered by the RISC R3000 CPU, is recorded on a DLT cassette by DAQ CPU using the on-board SCSI interface during the acceleration cycle. Two UNIX workstations are connected to the VME CPUs through a fast parallel bus and the Local Area Network. They analyze a subset of events for on-line monitoring. The data acquisition system is able to read and record 3500 ev/burst in the present configuration with a dead time of 15%.

Published
1998

21. The DISTO first level trigger at SATURNE

Author

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

Subjects
Spectrometer -- Design and construction, Particles (Nuclear physics) -- Research, Collisions (Nuclear physics) -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The DISTO collaboration has built a large-acceptance magnetic spectrometer designed to provide broad kinematic coverage of multi-particle final states produced in pp scattering. The spectrometer has been installed in the polarized proton beam of the Saturne accelerator in Saclay to study polarization observables in the [Mathematical Expression Omitted] reaction and vector meson production ([Phi], [Omega] and [Rho]) in pp collisions. The common signature of such events is the multiplicity of four charged particles in the final state. A flexible 1st level trigger which uses topological information from fast detectors (scintillating fibers and hodoscope) has been built. It is completely software programmable through a menu-driven user interface and allows switching between production and monitor triggers on successive beam spills.

Published
1998

24. 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., 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., Salabura, P., Tchalyshev, V., Tosello, F., Vigdor, S.E., and Zosi, G.

Published
2001
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25. K − meson production in the proton–proton reaction at 3.67 GeV/ c

Author

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., Fröhlich, I., 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., Tosello, F., Vigdor, S.E., and Zosi, G.

Published
1999
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26. DISTO: 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., 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., 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.

Published
1999
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27. DISTO data on

Author

W. Kühn, A. Grasso, A. Amoroso, Mario Dzemidzic, S. E. Vigdor, M. Maggiora, S. Heinz, L. C. Bland, W. W. Jacobs, Paul Kienle, J. Ritman, F. Brochard, R. Bertini, R. Garfagnini, L. Ferrero, R. Dressler, S. Sosio, P. Salabura, Toshimitsu Yamazaki, S Choi, A. Popov, V. Frolov, J.-Cl. Faivre, G. Pontecorvo, I. Fröhlich, Ken Suzuki, M. L. Colantoni, M.G. Alexeev, D. Panzieri, H.-W. Pfaff, F. Balestra, V. Tchalyshev, J. Foryciarz, A. Maggiora, Y. Bedfer, M.P. Bussa, and A. Brenschede

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Nuclear Theory, Nuclear Experiment, Spectral line
Abstract

The data from the DISTO Collaboration on the exclusive pp ! pK + production acquired at T p = 2:85 GeV have been re-analysed in order to search for a deeply bound K pp( X) state, to be formed in the binary process pp! K + X. The preliminary spectra of the MK+ missingmass and of the Mp invariant-mass show, for large transverse-momenta of protons and kaons, a distinct broad peak with a mass MX = 2265 2 MeV=c 2 and a width X = 118 8 MeV=c 2 .

Published
2010

28. ANGULAR DISTRIBUTIONS OF η MESON PRODUCTION IN pp REACTIONS

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Meson production, Spectrometer, Astronomy and Astrophysics, Heavy ion, Atomic physics, Kinetic energy, Atomic and Molecular Physics, and Optics, Spectral line
Abstract

With the DISTO spectrometer, exclusive η production in pp collisions have been measured at kinetic energies of T beam =2.15, 2.50 and 2.85 GeV, respectively, via the π+π-π0 decay channel. The resulting angular distributions of the η are important for the interpretation of dilepton spectra obtained in elementary as well as heavy ion reactions.

Published
2005

29. Resonant and non resonant K− production in pp reactions at 2.85 GeV

Author

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

Subjects
Nuclear physics, Physics, Rest (physics), Nuclear and High Energy Physics, Particle physics, Annihilation, Strangeness, Nucleon
Published
2001

30. Production of η' mesons in the pp→ppη' reaction at 3.67 GeV/c

Author

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

Subjects
Physics, Scattering cross-section, Nuclear and High Energy Physics, Particle physics, Meson production, Meson, respiratory system, Prime (order theory), Cross section (physics), cardiovascular system, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Beam (structure), circulatory and respiratory physiology
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.

Published
2000

31. 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

32. Spin Transfer in ExclusiveΛProduction fromp→pCollisions at3.67GeV/c

Author

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

Subjects
Physics, Condensed matter physics, General Physics and Astronomy, Spin transfer
Published
1999

33. Production ofφandωMesons in Near-ThresholdppReactions

Author

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

Subjects
Physics, Nuclear physics, Near threshold, Annihilation, Meson, Phase space, General Physics and Astronomy, Strangeness, Nucleon, Omega
Abstract

The ratio of the exclusive production cross sections for φ and ω mesons has been measured in pp reactions at Tbeam=2.85GeV. The observed φ/ω ratio is (3.7±0.7−0.9+1.2)×10−3. After phase space corrections, this ratio is about a factor of 10 enhanced relative to naive predictions based upon the Okubo-Zweig-Iizuka rule, in comparison to an enhancement by a factor of ∼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 p¯p annihilation experiments.

Published
1998

34. Formation of the S = -1 resonance X(2265) in the reaction pp → X+K+ at 2.50 and 2.85 GeV

Author

M. Maggiora, V. Frolov, D. Panzieri, Seonho Choi, M. L. Colantoni, M.G. Alexeev, Ken Suzuki, A. Grasso, F. Brochard, F. Tosello, P. Kienle, M.P. Bussa, S. Heinz, A. Maggiora, Toshimitsu Yamazaki, A. Brenschede, W. W. Jacobs, J. Ritman, R. Bertini, Gianfranco Zosi, G.B. Pontecorvo, R. Dressler, P. Salabura, A. Popov, L. C. Bland, L. Ferrero, R. Garfagnini, Mario Dzemidzic, S. E. Vigdor, J.-Cl. Faivre, W. Kuehn, M. Chiosso, Y. Bedfer, I. Froehlich, H.-W. Pfaff, Andrea Ferrero, F. Balestra, V. Tchalyshev, and J. Foryciarz

Subjects
exclusive reaction [p p], Physics, X(2265), Nuclear and High Energy Physics, education.field_of_study, +Lambda+K%2B+p%22">p p --> Lambda K+ p, DISTO experiment, missing-mass [mass spectrum], Population, 2.85 GeV [2.50], Resonance, Lambda, polarized proton beam, DISTO, Nuclear physics, wide-angle, Saclay PS, (2p K-) [bound state], Incident energy, ddc:530, education, Nuclear Experiment, production [Lambda(1405)], small-angle
Abstract

Analyzing DISTO data of $pp -> p Lambda K^+$ at $T_p = 2.50$ and 2.85 GeV to populate a previously reported X(2265) resonance with $M_X = 2267$ MeV/$c^2$ and $Gamma_X = 118$ MeV at 2.85 GeV, we found that the production of X(2265) at 2.50 GeV is much less than that at 2.85 GeV (less than 10%), though it is expected from a kinematical consideration to be produced as much as 33% of that at 2.85 GeV. The small population of X(2265) at 2.50 GeV is consistent with the very weak production of Lambda (1405) at the same incident energy toward its production threshold, thus indicating that Lambda (1405) plays an important role as a doorway state for the formation of X(2265)., Comment: 5 pages, 4 figures

Published
2012

40. HADES — A High Acceptance DiElectron Spectrometer

Author

K. Garrow, R. Schicker, W Koenig, P. Salabura, H. Bokemeyer, J. Foryciarz, A. Schröter, H. Schoen, A. Brenschede, F. Lefèvre, J. Stroth, and W. Karig

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Toroid, Spectrometer, Meson, Physics::Instrumentation and Detectors, Hadron, Detector, Electron, Atomic and Molecular Physics, and Optics, Charged particle, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

A High Acceptance DiElectron Spectrometer (HADES) has been proposed at the SIS accelerator of GSI in order to measure e + e − pairs produced in proton, meson and heavy ion induced collisions. HADES will be able to operate at the highest luminosities available at SIS in an environment of high hadron and photon background. A Ring Imaging Cerenkov Counter (RICH) serves for electron identification. Momentum measurement is achieved with a magnetic spectrometer consisting of superconducting toroidal coils and mini drift chambers for tracking. Arrays of pre-shower detectors and TOF wall are positioned behind the drift chambers for electron trigger purposes and for measuring the charged particle multiplicity. The detector features have been investigated in detailed simulations. The expected performance of the system in terms of efficiency, resolution and residual background are presented.

Published
1995

41. Pattern recognition for the HADES RICH detector

Author

A. Brenschede

Subjects
Physics, Spectrometer, Physics::Instrumentation and Detectors, business.industry, Detector, General Physics and Astronomy, Curved mirror, Electron, Ring (chemistry), Photocathode, Nuclear physics, Optics, High Energy Physics::Experiment, Polar coordinate system, business, Cherenkov radiation
Abstract

The planned High Acceptance DiElectron Spectrometer HADES [1] uses a Ring Imaging CHerenkov (RICH) detector for electron identification. The RICH detector, consisting of a gas radiator, a spherical mirror and a UV detector with CaF2 window and solid photocathode, covers the polar angle range from 18° to 88°. In a full simulation, including all known background processes, the basic properties of this detector were determined. The ring recognition, both for the off-line analysis as well as for a fast (10μs) second level trigger, was studied.

Published
1995

42. Formation of the S = -1 resonance X(2265) in the reaction $pp \rightarrow X+K^{+}$ at 2.50 and 2.85 GeV

Author

Kienle, P., Maggiora, M., Suzuki, K., Yamazaki, T., Alexeev, M., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chiosso, M., Choi, Seonho, Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J.-Cl., Ferrero, A., Ferrero, L., Foryciarz, J., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kühn, W., Maggiora, A., Panzieri, D., Pfaff, H.-W., Pontecorvo, G., Popov, A., Ritman, J., Salabura, Piotr, Tchalyshev, V., Tosello, F., Vigdor, S. E., and Zosi, G.

Published
2012

43. Indication of a Deeply Bound and CompactK−ppState Formed in thepp→pΛK+Reaction at 2.85 GeV

Author

Mario Dzemidzic, H.-W. Pfaff, M. L. Colantoni, Ken Suzuki, W. W. Jacobs, F. Balestra, J.-Cl. Faivre, R. Bertini, M.G. Alexeev, M. Maggiora, W. Kühn, A. Grasso, T. Yamazaki, S. Sosio, P. Salabura, R. Dressler, A. Amoroso, D. Panzieri, S. E. Vigdor, V. Tchalyshev, V. V. Frolov, R. Garfagnini, S. Heinz, J. Foryciarz, L. C. Bland, Y. Bedfer, J. Ritman, A. Maggiora, F. Brochard, I. Fröhlich, P. Kienle, G.B. Pontecorvo, M. P. Bussa, L. Ferrero, S Choi, A. Brenschede, and A. Popov

Subjects
Physics, Crystallography, Meson, Binding energy, Hadron, General Physics and Astronomy, Elementary particle, Nuclear Experiment, Lambda, Spectral line, Energy (signal processing), Boson
Abstract

We have analyzed data of the DISTO experiment on the exclusive pp{yields}p{Lambda}K{sup +} reaction at 2.85 GeV to search for a strongly bound compact K{sup -}pp({identical_to}X) state to be formed in the pp{yields}K{sup +}+X reaction. The observed spectra of the K{sup +} missing mass and the p{Lambda} invariant-mass with high transverse momenta of p and K{sup +} revealed a broad distinct peak of 26-{sigma} confidence with a mass M{sub X}=2267{+-}3(stat){+-}5(syst) MeV/c{sup 2} and a width {Gamma}{sub X}=118{+-}8(stat){+-}10(syst) MeV. The enormously large cross section indicates formation of a compact K{sup -}pp with a large binding energy of B{sub K}=103 MeV, which can be a possible gateway toward cold and dense kaonic nuclear matter.

Published
2010

44. DISTO data on K(-)pp

Author

Maggiora, Marco, Kienle, P., Suzuki, K., Yamazaki, T., Alexeev, M., Amoroso, Antonio, Balestra, Ferruccio, Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, Maria Pia, Choi, S., Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. C., Ferrero, L., Foryciarz, J., Frohlich, I., Frolov, V., Garfagnini, R., Grasso, Antonino, Heinz, S., Jacobs, W. W., Kuhn, W., Maggiora, A., Panzieri, D., Sosio, Stefano, Pfafl, H. W., Pontecorvo, G., Popov, A., Ritman, J., Salabura, P., Tchalyshev, V., and Vigdor, S. E.

Published
2010

45. Indication of a deeply bound and compact $K^{-}pp$ state formed in the $pp\rightarrow p\lambda K^{+}$ reaction at 2.85 GeV

Author

Yamazaki, T., Maggiora, M., Kienle, P., Suzuki, K., Amoroso, A., Alexeev, M., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Choi, Seonho, Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J.-Cl., Ferrero, L., Foryciarz, J., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kühn, W., Maggiora, A., Panzieri, D., Pfaff, H.-W., Pontecorvo, G., Popov, A., Ritman, J., Salabura, Piotr, Sosio, S., Tchalyshev, V., and Vigdor, E.

Published
2010

46. Indication of a Deeply Bound and Compact K − p p State Formed in the p p → p Λ K + Reaction at 2.85 GeV

Author

Yamazaki, T., Maggiora, M., Brenschede, A., Brochard, F., Bussa, M. P., Choi, Seonho, Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J.-Cl., Ferrero, L., Foryciarz, J., Kienle, P., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kühn, W., Maggiora, A., Panzieri, D., Pfaff, H.-W., Suzuki, K., Pontecorvo, G., Popov, A., Ritman, J., Salabura, P., Sosio, S., Tchalyshev, V., Vigdor, S. E., Amoroso, A., Alexeev, M., Balestra, F., Bedfer, Y., Bertini, R., and Bland, L. C.

Subjects
ddc:550
Published
2010

47. Indication of a Deeply Bound and Compact K- pp State Formed in the pp -> p Lambda K+ Reaction at 2.85 GeV

Author

Yamazaki, T, Maggiora, Marco, Kienle, P, Suzuki, K, Amoroso, Antonio, Alexeev, M, Balestra, Ferruccio, Bedfer, Y, Bertini, Raimondo Pietro, Bland, Lc, Brenschede, A, Brochard, F, Bussa, Maria Pia, Choi, S, Colantoni, Ml, Dressler, R, Dzemidzic, M, Faivre, Jc, Ferrero, Livio, Foryciarz, J, Frohlich, I, Frolov, Vladimir, Garfagnini, R, Grasso, Antonino, Heinz, S, Jacobs, Ww, Kuhn, W, Maggiora, A, Panzieri, Daniele, Pfaff, Hw, Pontecorvo, G, Popov, A, Ritman, J, Salabura, P, Sosio, Stefano, Tchalyshev, V, and Vigdor, Se

Subjects
SYSTEMS, NUCLEAR CLUSTERS
Published
2010

48. Indication of a deeply bound and compact K- pp state formed in the pp- -pLambdaK+ reaction at 2.85 GeV

Author

T, Yamazaki, M, Maggiora, P, Kienle, K, Suzuki, A, Amoroso, M, Alexeev, F, Balestra, Y, Bedfer, R, Bertini, L C, Bland, A, Brenschede, F, Brochard, M P, Bussa, Seonho, Choi, M L, Colantoni, R, Dressler, M, Dzemidzic, J-Cl, Faivre, L, Ferrero, J, Foryciarz, I, Fröhlich, V, Frolov, R, Garfagnini, A, Grasso, S, Heinz, W W, Jacobs, W, Kühn, A, Maggiora, D, Panzieri, H-W, Pfaff, G, Pontecorvo, A, Popov, J, Ritman, P, Salabura, S, Sosio, V, Tchalyshev, and S E, Vigdor

Abstract

We have analyzed data of the DISTO experiment on the exclusive pp --pLambdaK+ reaction at 2.85 GeV to search for a strongly bound compact K- pp(approximately = X) state to be formed in the pp --K+ + X reaction. The observed spectra of the K+ missing mass and the pLambda invariant-mass with high transverse momenta of p and K+ revealed a broad distinct peak of 26-sigma confidence with a mass M(X)=2267+/-3(stat)+/-5(syst) MeV/c2 and a width Gamma(X)=118+/-8(stat)+/-10(syst) MeV. The enormously large cross section indicates formation of a compact K- pp with a large binding energy of B(K)=103 MeV, which can be a possible gateway toward cold and dense kaonic nuclear matter.

Published
2009

49. Exclusive $\eta $ production in proton-proton reactions

Author

J.-Cl. Faivre, Piotr Salabura, M.P. Bussa, V. V. Frolov, A. Brenschede, R. Bertini, Seonho Choi, S. E. Vigdor, R. Dressler, H.-W. Pfaff, F. Tosello, I. Fröhlich, Mario Dzemidzic, W. Kühn, F. Balestra, A. Grasso, R. Garfagnini, Gianfranco Zosi, A. Maggiora, L. Ferrero, Andrea Ferrero, A. Manara, S. Heinz, A. Popov, W. W. Jacobs, J. Ritman, M. Maggiora, Y. Bedfer, L. C. Bland, G. Piragino, V. Tchalyshev, J. Foryciarz, M. L. Colantoni, D. Panzieri, and F. Brochard

Subjects
Physics, Momentum, Nuclear and High Energy Physics, Particle physics, Proton, Resonance, Dalitz plot, Invariant mass, Production (computer science), Atomic physics, Rest frame, Nuclear Experiment, Anisotropy
Abstract

Differential cross sections for the exclusive reaction $\stackrel{P\vec}{p}p\ensuremath{\rightarrow}pp\ensuremath{\eta}$ observed via the $\ensuremath{\eta}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decay channel have been measured at ${T}_{\text{beam}}=2.15\phantom{\rule{0.3em}{0ex}}\text{GeV}$, $2.50\phantom{\rule{0.3em}{0ex}}\text{GeV}$, and $2.85\phantom{\rule{0.3em}{0ex}}\text{GeV}$ (excess energies $324\phantom{\rule{0.3em}{0ex}}\text{MeV}$, $412\phantom{\rule{0.3em}{0ex}}\text{MeV}$, and $554\phantom{\rule{0.3em}{0ex}}\text{MeV}$). The influence of the $N(1535){S}_{11}$ resonance is clearly seen in the invariant mass and momentum dependent differential cross sections. The extracted resonance parameters are compatible with existing data. No significant evidence for further resonance contributions has been found. In addition, angular distributions of the $pp\ensuremath{\eta}$ final state have been measured. The polar angle distribution of the $\ensuremath{\eta}$ shows an anisotropy with respect to the beam axis for the lowest beam energy, which vanishes for the higher energies. The sign of this anisotropy is negative and expected to be sensitive to the dominant production mechanism. In contrast, the proton polar angle in the $pp$ rest frame tends to be more strongly aligned along the beam axis with increasing beam energy. The analyzing power ${A}_{y}$ is compatible with zero for all beam energies.

Published
2004

50. Exclusive eta production in pp reactions

Author

Frohlich, I, Balestra, Ferruccio, Bedfer, Y, Bertini, Raimondo Pietro, Bland, Lc, Brenschede, A, Brochard, F, Bussa, Maria Pia, Choi, S, Colantoni, M. L., Dressler, R, Dzemidzic, M, Faivre, Jc, Ferrero, Andrea, Ferrero, Livio, Foryciarz, J, Frolov, Vladimir, Garfagnini, Raffaello, Grasso, Antonino, Heinz, S, Jacobs, Ww, Kuhn, W, Maggiora, A, Maggiora, Marco, Manara, A., Panzieri, Daniele, Pfaff, Hw, Piragino, Guido, Popov, A, Ritman, J, Salabura, P, Tchalyshev, V, Tosello, F, and Vigdor, Se

Subjects
NUCLEON-NUCLEON COLLISIONS, PROTON-PROTON COLLISIONS, MESON PRODUCTION, PP-ETA+REACTION%22">PP->PP-ETA REACTION, OF-FLIGHT SPECTROMETER, NEAR-THRESHOLD
Published
2003

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