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87 results on '"Brenschede, A."'

1. 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

2. 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, Marco, Alexeev, Maxim, Balestra, Ferruccio, Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, Maria Pia, Chiosso, Michela, Choi, Seonho, Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. C. l., 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.

Subjects
Physics, Nuclear and High Energy Physics, FOS: Physical sciences, State (functional analysis), Condensed Matter Physics, Lambda, Atomic and Molecular Physics, and Optics, p-process, Spectral line, Nuclear physics, K̄ nuclei, Kaon condensation, Strange dibaryon, Super-strong nuclear force, Physical and Theoretical Chemistry, Atomic and Molecular Physics, Bound state, and Optics, Nuclear Experiment (nucl-ex), Proton emission, Nuclear Experiment
Abstract

We have analyzed data of the DISTO experiment on the exclusive pp to K^+ Lambda p process at T_p = 2.85$ GeV to search for a K^-pp (= X) nuclear bound state to be formed in the pp to K^+ + X reaction. The deviation spectra of the K^+ missing-mass MM (K^+) and Lambda p invariant-mass M(Lambda-p) with selection of large-angle proton emission revealed a structure with M_X = 2265 +- 2 MeV/c2 and Gamma_X = 118 +- 8$ MeV., Comment: 6 pages, 4 figues, Proceedings of EXA08

Published
2009

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

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., 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
FOS: Physical sciences, Nuclear Experiment (nucl-ex)
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)., 5 pages, 4 figures

Published
2011
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14. 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

15. 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
High Energy Physics::Experiment, 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

16. 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

17. 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

18. 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

19. 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

20. 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., Fr��hlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., K��hn, 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 (hep-ex), Nuclear Theory, FOS: Physical sciences, Nuclear Experiment, 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., 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

21. 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

22. 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

23. 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

24. Exclusive $\eta $ production in pp reactions

Author

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

Subjects
Physics, Nuclear and High Energy Physics, lower energy, Hadron, anisotropy, Nuclear physics, polar angle, Physics::Accelerator Physics, Beam direction, Nuclear fusion, angular distribution, beam energy, Vector meson, Atomic physics, Polar coordinate system, Nuclear Experiment, Anisotropy, Beam energy, Beam (structure)
Abstract

Angular distributions for the exclusive reaction pp → ppη observed via the π + π − π 0 decay channel have been measured at T beam = 2.15 GeV, 2.50 GeV and 2.85 GeV (excess energies Q = 324 MeV, 412 MeV and 554 MeV). The polar angle of the η shows an anisotropy with respect to the beam direction for the lowest energy, which vanishes for the higher energies. The anisotropy of the pp polar angle increases slightly with the beam energy.

Published
2003

25. ρ0 MESON PRODUCTION IN THE pp REACTIONS WITH DISTO

Author

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

Subjects
Physics, Particle physics, Meson production
Published
2003

26. 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

27. Exclusive η production in pp reactions

Author

I. Fröhlich, 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, A. Ferrero, L. Ferrero, J. Foryciarz, V. Frolov, R. Garfagnini, A. Grasso, S. Heinz, W. W. Jacobs, W. Kühn, A. Maggiora, M. Maggiora, A. Manara, D. Panzieri, H.-W. Pfaff, G. Piragino, A. Popov, J. Ritman, P. Salabura, V. Tchalyshev, F. Tosello, S. E. Vigdor, and G. Zosi

Published
2003

28. ρ0Meson Production in thepp→ppπ+π−Reaction at3.67 GeV/c

Author

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

Subjects
Physics, General Physics and Astronomy, Production (economics), Photochemistry
Published
2002

29. rho0 meson production in the pp ---> pp pi+ pi- reaction at 3.67-GeV/c

Author

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

Published
2002

30. <font face='symbol'>r</font>0meson production in the pp->pp<font face=symbol>p</font>+<font face=symbol></font>p-reaction at 3.67 GeV/c

Author

Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Seon-Ho, C., Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. C., Ferrero, A., Ferrero, L., Foryciarz, J., Frohlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., Kuhn, 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.

Abstract

kein Abstract

Published
2002

31. 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., Fr��hlich, I., Frolov, V., Garfagnini, R., Grasso, A., Heinz, S., Jacobs, W. W., K��hn, 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 (hep-ex), FOS: Physical sciences, Nuclear 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., 3 figures, 11 pages

Published
2002
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32. 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
Nuclear Experiment, 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
2001

33. φandωmeson production inppreactions atplab=3.67 GeV/c

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Production (economics), Pulp and paper industry
Published
2001

34. New results from DISTO for spin observables in exclusive hyperon production

Author

Maggiora, Marco, Balestra, Ferruccio, Bedfer, Y, Bertini, Raimondo Pietro, Bland, Lc, Brenschede, A, Brochard, F, Bussa, Maria Pia, Choi, S, Debowski, M, Dressler, R, Dzemidzic, M, Faivre, Jc, Falomkin, Iv, Fava, Luciano, Ferrero, Livio, Foryciarz, J, Frohlich, I, Frolov, Vladimir, Garfagnini, R, Grasso, Antonino, Grosse, E, Heinz, S, Ivanov, Vv, Jacobs, Ww, Kuhn, W, Maggiora, A, Manara, A, Panzieri, D, Pfaff, Hw, Piragino, Guido, Pontecorvo, Gb, Popov, A, Ritman, J, Salabura, P, Tchalyshev, V, Tosello, F, Vigdor, Se, and Zosi, Gianfranco

Subjects
strangeness, Yperon production, polarisation transfer, analysing power, spin observables, lambda, exclusive
Published
2001

35. phi and omega meson production in p p reactions at p(lab) = 3.67-GeV/c

Author

Grasso, Antonino, Balestra, Ferruccio, Bedfer, Y, Bertini, Raimondo Pietro, Bland, Lc, Brenschede, A, Brochard, F, Bussa, Maria Pia, Choi, Sh, Debowski, M, Dressler, R, Dzemidzic, M, Faivre, Jc, Falomkin, Iv, Fava, Luciano, Ferrero, Livio, Foryciarz, J, Frohlich, I, Frolov, Vladimir, Garfagnini, Raffaello, Grosse, E, Heinz, S, Ivanov, Vv, Jacobs, Ww, Kuhn, W, Maggiora, A, Maggiora, Marco, Manara, A., Panzieri, Daniele, Pfaff, Hw, Piragino, Guido, Pontecorvo, Gb, Popov, A, Ritman, J, Salabura, P, Tchalyshev, V, Tosello, F, Vigdor, Se, and Zosi, Gianfranco

Published
2001

36. 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

37. 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., Marco Maggiora, 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.

Subjects
PROTON-PROTON COLLISIONS, REST, ANTIKAON PRODUCTION, BEAM ENERGIES, STRANGENESS, PHI-MESON PRODUCTION, NUCLEON, ANNIHILATION, PROBES, KAON
Published
2001

38. 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

39. $\phi$ 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

40. 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
cardiovascular system, High Energy Physics::Experiment, respiratory system, Nuclear Experiment, 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., Comment: 14 pages, 5 figures, accepted by Phys.Lett.B

Published
2000

41. Production of eta-prime mesons in the p p ---> p p eta-prime reaction at 3.67-GeV/c

Author

Grasso, Antonino, Balestra, Ferruccio, Bedfer, Y, Bertini, Raimondo Pietro, Bland, Lc, Brenschede, A, Brochard, F, Bussa, Maria Pia, Choi, S, Debowski, M, Dzemidzic, M, Faivre, Jc, Falomkin, Iv, Fava, Luciano, Ferrero, Livio, Foryciarz, J, Frohlich, I, Frolov, Vladimir, Garfagnini, Raffaello, Heinz, S, Ivanov, Vv, Jacobs, Ww, Kuhn, W, Maggiora, A, Maggiora, Marco, Manara, A., Panzieri, Daniele, Pfaff, Hw, Piragino, Guido, Pontecorvo, Gb, Popov, A, Ritman, J, Salabura, P, Tchalyshev, V, Tosello, F, Vigdor, Se, and Zosi, Gianfranco

Subjects
COLLISIONS NEAR-THRESHOLD, SPIN, TOTAL CROSS-SECTION, PROTON-SCATTERING, U(1), DECAYS
Published
2000

42. $��$ and $��$ 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 Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The exclusive production cross sections for $��$ and $��$ mesons have been measured in proton-proton reactions at $p_{lab}=3.67$ GeV/c. The observed $��/��$ 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 $��/��$ ratio observed in specific channels of $\bar pp$ annihilation experiments. Furthermore, differential cross section results are also presented which indicate that although the $��$ 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., Revtex 49 pages, 11 figures, Phys Rev C in print

Published
2000
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43. 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
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Nuclear Experiment (nucl-ex), 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., 4 pages, including 4 figures. To be published in PRL

Published
1999
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44. 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

45. Spin transfer in exclusive Lambda production from (p)over-right-arrowp collisions at 3.67 GeV/c

Author

Balestra, Ferruccio, Bedfer, Y, Bertini, Raimondo Pietro, Bland, Lc, Brenschede, A, Brochard, F, Bussa, Maria Pia, Chalyshev, V, Choi, S, Debowski, M, Dzemidzic, M, Faivre, Jc, Falomkin, Iv, Fava, Luciano, Ferrero, Livio, Foryciarz, J, Frolov, Vladimir, Garfagnini, R, Gill, D, Grasso, Antonino, Heinz, S, Ivanov, Vv, Jacobs, Ww, Kuhn, W, Maggiora, A, Maggiora, Marco, Manara, A, Panzieri, Daniele, Pfaff, Hw, Piragino, Guido, Pontecorvo, Gb, Popov, A, Ritman, J, Salabura, P, Tosello, F, Vigdor, Se, and Zosi, Gianfranco

Subjects
ASYMMETRY, HYPERON POLARIZATION
Published
1999

46. DISTO: a large acceptance multiparticle spectrometer for 1-3 GeV proton beams

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Physics::Instrumentation and Detectors, Scintillator, Tracking (particle physics), Particle identification, Particle detector, Nuclear physics, Dipole magnet, Magnet, SATURNE, High Energy Physics::Experiment, Nuclear Experiment, Instrumentation, Cherenkov radiation
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 Cherenkov 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
1999

47. 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

48. 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. The DISTO data acquisition system at SATURNE

Author

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

Subjects
disto, Nuclear and High Energy Physics, Engineering, physics, data acquisition system, saturne, Spectrometer, SCSI, business.industry, Interface (computing), Particle accelerator, Dead time, law.invention, Data acquisition, Nuclear Energy and Engineering, law, Electronic engineering, Electrical and Electronic Engineering, business, Computer hardware, Computer Automated Measurement and Control, VMEbus
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 p/spl I.oarr/p/spl rarr/pK/sup +/Y/spl I.oarr/ (Y=/spl Lambda/,/spl Sigma//sup 0/ or Y*) reaction and vector meson production (/spl phi/,/spl omega/ and /spl 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

50. Systematic study of low-mass electron pair production in p-Be and p-Au collisions at 450 GeV/c

Author

G. Agakichiev, M. Appenheimer, R. Averbeck, F. Ballester, R. Baur, A. Brenschede, J. Diaz, A. Drees, U. Faschingbauer, J.L. Ferrero, P. Fischer, Z. Fraenkel, M. Franke, C. Fuchs, E. Gatti, P. Glässel, T. Günzel, C.P. de los Heros, F. Hess, R. Holzmann, V. Iourevitch, D. Irmscher, C. Jacob, W. Kühn, B. Lenkeit, H. Löhner, A. Marin, F.M. Marques, G. Martinez, V. Metag, M. Notheisen, R. Novotny, L.H. Olsen, R. Ostendorf, Y. Panebrattsev, A. Pfeiffer, I. Ravinovich, P. Rehak, M. Sampietro, A. Schön, J. Schukraft, Y. Schutz, S. Shimansky, A. Shor, R.S. Simon, H.J. Specht, V. Steiner, S. Tapprogge, G. Tel-Zur, I. Tserruya, T. Ullrich, H. Wilschut, J.P. Wurm, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Research unit Nuclear & Hadron Physics, KVI - Center for Advanced Radiation Technology, Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Bardon, Peggy

Subjects
Particle physics, Physics and Astronomy (miscellaneous), Meson, Nuclear Theory, Hadron, DIRECT LEPTON PRODUCTION, 01 natural sciences, PHYSICS, Nuclear physics, DEPENDENCE, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Physics, PROTON-NUCLEUS, Electron pair, Range (particle radiation), 010308 nuclear & particles physics, [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], MODEL, Pair production, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Mass spectrum, High Energy Physics::Experiment, Production (computer science), NUCLEUS COLLISIONS, Low Mass, D-MESON PRODUCTION
Abstract

In a joint effort the CERES/NA45 and TAPS collaborations have measured low-mass electron pairs in p-Be and p-Au collisions at 450 GeV/c at the CERN SPS. In the range covered up to approximate to 1.5 GeV/c(2) the mass spectra from p-Be and p-Au collisions are well explained by electron pairs from decays of neutral mesons. For p-Au our result is new. For p-Be, the simultaneously measured electron pairs and photons served as a direct measure of the eta Dalitz decay contribution to the inclusive pair spectrum in which instrumental uncertainties are highly reduced. We confirm the earlier finding of HELIOS-1 with significantly reduced systematic uncertainties of 23% in the mass:range below 450 MeV/c(2), and of 28% in the mass range above 750 MeV/c(2) at 90% confidence limit. Any unconventional source of electron pairs is limited by these error margins as the percentage fraction of the hadronic contribution.

Published
1998

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