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101 results on '"Quentmeier, C."'

1. Drift chamber with a c-shaped frame

Author

Smyrski, J., Kolf, Ch., Adam, H. -H., Budzanowski, A., Czyzykiewicz, R., Grzonka, D., Heczko, A., Janusz, M., Jarczyk, L., Kamys, B., Khoukaz, A., Kilian, K., Kowina, P., Misiak, A., Moskal, P., Oelert, W., Piskor-Ignatowicz, C., Przerwa, J., Quentmeier, C., Rozek, T., Santo, R., Schepers, G., Sefzick, T., Siemaszko, M., Taschner, A., Winter, P., Wolke, M., Wustner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

We present the construction of a planar drift chamber with wires stretched between two arms of a c-shaped aluminium frame. The special shape of the frame allows to extendthe momentum acceptance of the COSY-11 detection system towards lower momenta without suppressing the high momentum particles. The proposed design allows for construction of tracking detectors covering small angles with respect to the beam, which can be installed and removed without dismounting the beam-pipe. For a three-dimensional track reconstruction a computer code was developed using a simple algorithm of hit preselection., Comment: submitted to Nucl. Instr. & Meth A

Published
2005
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2. Energy dependence of the Lambda/Sigma0 production cross section ratio in proton proton interactions

Author

Kowina, P., Wolke, M., Adam, H. -H., Budzanowski, A., Czyzykiewicz, R., Grzonka, D., Haidenbauer, J., Janusz, M., Jarczyk, L., Kamys, B., Khoukaz, A., Kilian, K., Moskal, P., Oelert, W., Piskor-Ignatowicz, C., Przerwa, J., Quentmeier, C., Rozek, T., Santo, R., Schepers, G., Sefzick, T., Siemaszko, M., Smyrski, J., Steltenkamp, S., Strzalkowski, A., Taschner, A., Winter, P., Wustner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

The production of the Lambda and Sigma0 hyperons has been measured via the pp->pK+Lambda / Sigma0 reaction at the internal COSY-11 facility in the excess energy range between 14 and 60 MeV. The transition of the Lambda/Sigma0 cross section ratio from about 28 at Q<=13 MeV to the high energy level of about 2.5 is covered by the data showing a strong decrease of the ratio between 10 and 20 MeV excess energy. Effects from the final state interactions in the p-Sigma0 channel seem to be much smaller compared to the p-Lambda one. Estimates of the effective range parameters are given for the N-Lambda and the N-Sigma systems., Comment: 6 pages, 6 figures, submitted to EPJA

Published
2004
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3. Total and Differential Cross Sections for the pp-->pp eta-prime Reaction Near Threshold

Author

Khoukaz, A., Geck, I., Quentmeier, C., Adam, H. -H., Budzanowski, A., Czyzykiewicz, R., Grzonka, D., Jarczyk, L., Kilian, K., Kowina, P., Lang, N., Lister, T., Moskal, P., Oelert, W., Piskor-Ignatowicz, C., Rozek, T., Santo, R., Schepers, G., Sefzick, T., Sewerin, S., Siemaszko, M., Smyrski, J., Strzalkowski, A., Taschner, A., Winter, P., Wolke, M., Wustner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

The eta-prime meson production in the reaction pp-->pp eta-prime has been studied at excess energies of Q = 26.5, 32.5 and 46.6 MeV using the internal beam facility COSY-11 at the cooler synchrotron COSY. The total cross sections as well as one angular distribution for the highest Q-value are presented. The excitation function of the near threshold data can be described by a pure s-wave phase space distribution with the inclusion of the proton-proton final state interaction and Coulomb effects. The obtained angular distribution of the eta-prime mesons is also consistent with pure s-wave production., Comment: 6 pages, 5 figures, submitted to Eur. Phys. J. A

Published
2004
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4. Upper limit for the cross section of the overlapping scalar resonances f0(980) and a0(980) produced in proton-proton collisions in the range of the reaction threshold

Author

Moskal, P., Adam, H. -H., Budzanowski, A., Czyzykiewicz, R., Grzonka, D., Janusz, M., Jarczyk, L., Kamys, B., Khoukaz, A., Kilian, K., Kolf, C., Kowina, P., Lister, T., Oelert, W., Piskor-Ignatowicz, C., Przerwa, J., Quentmeier, C., Rozek, T., Santo, R., Schepers, G., Sefzick, T., Siemaszko, M., Smyrski, J., Strzalkowski, A., Taschner, A., Winter, P., Wolke, M., Wustner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

Utilizing a missing mass technique we investigate the pp --> ppX reaction scanning beam energies in the range permitting to create a mass close to that of the f0(980) and a0(980) scalar resonances, but still below the K^+K^- threshold where they decay dominantly into pi pi and pi eta mesons, respectively. Prior to the data analysis we introduce a notion of the close to threshold total cross section for broad resonances. We estimated for the overlapping mesons a0 and f0 the total cross section to be smaller than 430 nb at excess energy of Q = 5 MeV. The experiment have been performed at the Cooler Synchrotron COSY using the COSY-11 facility., Comment: 11 pages, 6 figures, submitted to J. Phys. G: Nucl. Phys

Published
2003
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5. Analysing power A_y in the reaction p(pol) p --> p p eta close to threshold

Author

Winter, P., Adam, H. -H., Bauer, F., Budzanowski, A., Czyzykiewicz, R., Goetz, T., Grzonka, D., Jarczyk, L., Khoukaz, A., Kilian, K., Kolf, C., Kowina, P., Lang, N., Lister, T., Moskal, P., Oelert, W., Quentmeier, C., Rozek, T., Santo, R., Schepers, G., Sefzick, T., Siemaszko, M., Smyrski, J., Steltenkamp, S., Strzalkowski, A., Wolke, M., Wuestner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

Measurements of the eta meson production with a polarised proton beam in the reaction p(pol) p --> p p eta have been carried out at an excess energy of Q = 40 MeV. The dependence of the analysing power A_y on the polar angle theta^*_q of the eta meson in the center of mass system (CMS) has been studied. The data indicate the possibility of an influence of p- and d-waves to the close to threshold eta production., Comment: 6 pages, 5 figures, in section 3.1 the formula of vec(p) containing fatal typos was removed, and the values in table were corrected

Published
2002
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6. Experimental results on strangeness production in proton-proton collisions at COSY

Author

Moskal, P., Adam, H. -H., Budzanowski, A., Czyzykiewicz, R., Grzonka, D., Kolf, C., Jarczyk, L., Khoukaz, A., Kilian, K., Kowina, P., Lang, N., Lister, T., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Sefzick, T., Siemaszko, M., Smyrski, J., Strzalkowski, A., Winter, P., Wolke, M., Wustner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

The production of K+ and K- mesons in elementary proton-proton collision has been investigated at the Cooler Synchrotron COSY in Juelich. A high quality proton beam with low emittance and small momentum spread permitted to study the creation of these mesons very close to the kinematical threshold. The energy dependence of the total cross section is investigated using internal beam facilities providing a high accuracy particle momentum determination as well as an external non-magnetic detection setup with a large geometrical acceptance. The determination of the four-momentum vectors for all ejectiles of each registered event gives the complete kinematical information allowing to study the interaction of the outgoing particles. Results on the performed studies of the pp --> pp K+ K-, pp --> p Lambda K+ and pp --> p Sigma0 K+ reactions will be presented and their relevance to the interpretation of heavy ion collisions will be discussed., Comment: 8 pages, 6 figures, plenary talk at 6th International Conference On Strange Quarks in Matter: '2001 - A Flavorspace Odyssey' (SQM2001), Frankfurt, Germany, September 25-29, 2001, to be published in J. Phys. G: Nucl. Part. Phys

Published
2002
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7. Study of the eta-proton interaction via the reaction p p --> p p eta

Author

Moskal, P., Adam, H. H., Budzanowski, A., Czyzykiewicz, R., Gotz, T., Grzonka, D., Jarczyk, L., Khoukaz, A., Kilian, K., Kolf, C., Kowina, P., Lang, N., Lister, T., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Sefzick, T., Siemaszko, M., Smyrski, J., Steltenkamp, S., Strzalkowski, A., Winter, P., Wolke, M., Wustner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

A measurement of the pp --> p p eta reaction at the excess energy of Q = 15.5 +- 0.4 MeV has been carried out at the internal beam facility COSY-11 with an integrated luminosity of 811 nb^-1 The number of ~24000 identified events permits a precise determination of total (2.32 +- 0.05 +- 0.35 \mu b) and differential cross sections. Preliminary investigations show that the angular distribution of the eta meson in the center-of-mass system is isotropic. A qualitative analysis of the Dalitz-plot distribution is presented., Comment: 3pp, Talk given at 9th International Symposium on Meson - Nucleon Physics and the Structure of the Nucleon (MENU 2001), Washington, District of Columbia, 26-31 Jul 2001. To be published in pN Newsletter 16 (2001)

Published
2001

8. On the close to threshold meson production in neutron-neutron collisions

Author

Moskal, P., Adam, H. -H., Budzanowski, A., Goetz, T., Grzonka, D., Jarczyk, L., Khoukaz, A., Kilian, K., Kolf, C., Kowina, P., Lang, N., Lister, T., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Sefzick, T., Siemaszko, M., Smyrski, J., Steltenkamp, S., Strzalkowski, A., Winter, P., Wolke, M., Wuestner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

A method of measuring the close to threshold meson production in neutron-neutron collisions is described where the momenta of the colliding neutrons can be determined with the accuracy obtainable for the proton-proton reaction. The technique is based on the double quasi-free nn --> nn X^0 reaction, where deuterons are used as a source of neutrons, Comment: 6 pages, 2 figures, to be published in Phys. Lett. B

Published
2001
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9. Near Threshold K+K- Meson-Pair Production in Proton-Proton Collisions

Author

Quentmeier, C., Adam, H. -H., Balewski, J. T., Budzanowski, A., Grzonka, D., Jarczyk, L., Khoukaz, A., Kilian, K., Kowina, P., Lang, N., Lister, T., Moskal, P., Oelert, W., Santo, R., Schepers, G., Sefzick, T., Sewerin, S., Siemaszko, M., Smyrski, J., Strzalkowski, A., Wolke, M., Wuestner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

The near threshold total cross section and angular distributions of K+K- pair production via the reaction pp --> ppK+K- have been studied at an excess energy of Q = 17 MeV using the COSY-11 facility at the cooler synchrotron COSY. The obtained cross section as well as an upper limit at an excess energy of Q = 3 MeV represent the first measurements on the K+K- production in the region of small excess energies where production via the channel pp --> pp Phi --> ppK+K- is energetically forbidden. The possible influence of a resonant production via intermediate scalar states f0(980) and a0(980) is discussed., Comment: 8 pages, 6 figures, replaced with revised version, accepted for publication in Phys. Lett. B

Published
2001
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10. Monitoring of the accelerator beam distributions for internal target facilities

Author

Moskal, P., Adam, H. -H., Budzanowski, A., Grzonka, D., Jarczyk, L., Khoukaz, A., Kilian, K., Kowina, P., Lang, N., Lister, T., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Sefzick, T., Sewerin, S., Siemaszko, M., Smyrski, J., Strzalkowski, A., Wolke, M., Wuestner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

We describe a direct method for monitoring the geometrical dimensions of a synchrotron beam at the target position for internal target installations. The method allows for the observation of the proton beam size as well as the position of the beam relative to the target. As a first demonstration of the technique, we present results obtained by means of the COSY-11 detection system installed at the cooler synchrotron COSY. The influence of the stochastic cooling on the COSY proton beam dimensions is also investigated., Comment: 7 pages, 8 figures, Submitted to Nucl. Inst. & Meth. A

Published
2000
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11. Proton-proton collisions at production thresholds

Author

Moskal, P., Adam, H. -H., Budzanowski, A., Grzonka, D., Jarczyk, L., Khoukaz, A., Kilian, K., Koehler, M., Kowina, P., Lang, N., Lister, T., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Sefzick, T., Sewerin, S., Siemaszko, M., Smyrski, J., Sokolowski, M., Strzalkowski, A., Wolke, M., Wuestner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

Recent results obtained by the COSY-11 collaboration concerning the production of eta and eta' mesons in the pp --> pp Meson reaction are presented. A comparison of the production amplitude for the pi(0), eta and eta' mesons at the same phase space volume allows to conclude that the proton-eta' interaction is in the order of, or smaller than, the proton-pi(0) one. A total cross section determined in a preliminary analysis of the data of elementary kaon and antikaon production via the pp-->ppK(+)K(-) reaction measured at excess energy of Q = 17 MeV is reported., Comment: Talk given at the International Workshop MESON'2000, Cracow, Poland, 19-23 May 2000, 8pp. To be published in Acta Phys. Pol. B

Published
2000

12. Heavy Meson Production at COSY - 11

Author

Moskal, By P., Adam, H. -H., Balewski, J. T., Budzanowski, A., Goodman, C., Grzonka, D., Jarczyk, L., Jochmann, M., Khoukaz, A., Kilian, K., Kowina, P., Koehler, M., Lister, T., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Seddik, U., Sefzick, T., Sewerin, S., Smyrski, J., Strzalkowski, A., Wolke, M., and Wustner, P.

Subjects
Nuclear Experiment
Abstract

The COSY-11 collaboration has measured the total cross section for the pp --> pp eta-prime and pp --> pp eta reactions in the excess energy range from Q = 1.5 MeV to Q = 23.6 MeV and from Q = 0.5 MeV to Q = 5.4 MeV, respectively. Measurements have been performed with the total luminosity of 73 nb^(-1) for the pp --> pp eta reaction and 1360 nb^(-1) for the pp --> pp eta-prime one. Recent results are presented and discussed., Comment: Invited talk at 4th International Conference on Physics at Storage Rings (STORI 99), Bloomington, Indiana, USA, September 12-16, 1999

Published
2000
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13. S-wave eta'-proton FSI; phenomenological analysis of near-threshold production of pi0, eta, and eta' mesons in proton-proton collisions

Author

Moskal, P., Adam, H. -H., Balewski, J. T., Budzanowski, A., Budzinski, J., Grzonka, D., Jarczyk, L., Khoukaz, A., Kilian, K., Kowina, P., Lang, N., Lister, T., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Sefzick, T., Sewerin, S., Siemaszko, M., Smyrski, J., Strzalkowski, A., Wolke, M., Wuestner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

We describe a novel technique for comparing total cross sections for the reactions pp --> pp pi(0), pp --> pp eta, and pp --> pp eta' close to threshold. The initial and final state proton-proton interactions are factored out of the total cross section, and the dependence of this reduced cross section on the volume of phase space is discussed. Different models of the proton-proton interaction are compared. We argue that the scattering length of the S-wave eta'-proton interaction is of the order of 0.1 fm., Comment: 10 pages, 5 figures

Published
2000
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14. Energy Dependence of the Near-Threshold Total Cross-Section for the pp --> pp eta' Reaction

Author

Moskal, P., Adam, H. -H., Balewski, J. T., Baru, V., Budzanowski, A., Grzonka, D., Haidenbauer, J., Jarczyk, L., Khoukaz, A., Kilian, K., Koehler, M., Kowina, P., Kudryavtsev, A., Lang, N., Lister, T., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Sefzick, T., Sewerin, S., Siemaszko, M., Smyrski, J., Strzalkowski, A., Wolke, M., Wuestner, P., and Zipper, W.

Subjects
Nuclear Experiment
Abstract

Total cross sections for the pp --> pp eta' reaction have been measured in the excess energy range from Q = 1.53 MeV to Q = 23.64 MeV. The experiment has been performed at the internal installation COSY-11 using a stochastically cooled proton beam of the COoler SYnchrotron COSY and a hydrogen cluster target. The determined energy dependence of the total cross section weakens the hypothesis of the S-wave repulsive interaction between the eta' meson and the proton. New data agree well with predictions based on the phase-space distribution modified by the proton-proton final-state-interaction (FSI) only., Comment: 12 pages, 1 table, 4 figures

Published
2000
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15. Near-Threshold eta Meson Production in Proton-Proton Collisions

Author

Smyrski, J., Wuestner, P., Budzanowski, A., Dombrowski, H., Grzonka, D., Jarczyk, L., Jochmann, M., Khoukaz, A., Kilian, K., Kowina, P., Koehler, M., Moskal, P., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Seddik, U., Sefzick, T., Sewerin, S., Strzalkowski, A., and Wolke, M.

Subjects
Nuclear Experiment
Abstract

The production of eta mesons has been measured in the proton-proton interaction close to the reaction threshold using the COSY-11 internal facility at the cooler synchrotron COSY. Total cross sections were determined for eight different excess energies in the range from 0.5 MeV to 5.4 MeV. The energy dependence of the total cross section is well described by the available phase-space volume weighted by FSI factors for the proton-proton and proton-eta pairs., Comment: 9 pages, 1 table, 5 figures

Published
1999
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16. Comparison of Lambda and Sigma(0) Threshold Production in Proton-Proton Collisions

Author

Sewerin, S., Schepers, G., Balewski, J. T., Budzanowski, A., Eyrich, W., Fritsch, M., Goodman, C., Grzonka, D., Haidenbauer, J., Hanhart, C., Hofmann, M., Jarczyk, L., Jochmann, M., Khoukaz, A., Kilian, K., K"ohler, M., Lister, T., Moskal, P., Oelert, W., Pellmann, I., Quentmeier, C., Santo, R., Seddik, U., Sefzick, T., Smyrski, J., Stinzing, F., Wilkin, A. Strzalkowski C., Wolke, M., W"ustner, P., and Wyrwa, D.

Subjects
Nuclear Experiment
Abstract

Threshold measurements of the associated strangeness production reactions pp --> p K(+) Lambda and pp --> p K(+) Sigma(0) are presented. Although slight differences in the shapes of the excitation functions are observed, the most remarkable feature of the data is that at the same excess energy the total cross section for the Sigma(0) production appears to be about a factor of 28 smaller than the one for the Lambda particle. It is concluded that strong Sigma(0)-p final state interactions, and in particular the Sigma-N --> Lambda-p conversion reaction, are the likely cause of the depletion for the yield in the Sigma signal. This hypothesis is in line with other experimental evidence in the literature., Comment: 13 pages, 3 figures, 1 table

Published
1998
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17. Low-Energy $\Lambda-\p$ Scattering Parameters from the $pp \to pK^+\Lambda$ Reaction

Author

Balewski, J. T., Budzanowski, A., Goodman, C., Grzonka, D., Hofmann, M., Jarczyk, L., Khoukaz, A., Kilian, K., Lister, T., Moskal, P., Oelert, W., Pellmann, I. A., Quentmeier, C., Santo, R., Schepers, G., Sefzick, T., Sewerin, S., Smyrski, J., Strzałkowski, A., Thomas, C., Wilkin, C., Wolke, M., Wüstner, P., and Wyrwa, D.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Constraints on the spin-averaged $\Lambda p$ scattering length and effective range have been obtained from measurements of the $pp\to pK^+\Lambda$ reaction close to the production threshold by comparing model phase-space Dalitz plot occupations with experimental ones. The data fix well the position of the virtual bound state in the $\Lambda p$ system. Combining this with information from elastic $\Lambda p$ scattering measurements at slightly higher energies, together with the fact that the hyperdeuteron is not bound, leads to a new determination of the low energy $\Lambda p$ scattering parameters., Comment: 18 pages, 7 figures

Published
1998
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18. $\eta^{\prime}$ production in proton-proton scattering close to threshold}

Author

Moskal, P., Balewski, J. T., Budzanowski, A., Dombrowski, H., Goodman, C., Grzonka, D., Haidenbauer, J., Hanhart, C., Jarczyk, L., Jochmann, M., Khoukaz, A., Kilian, K., Köhler, M., Kozela, A., Lister, T., Meißner, U. -G., Nikolaev, N., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Seddik, U., Sefzick, T., Smyrski, J., Sokołowski, M., Strzałkowski, A., Thomas, C., Wolke, M., Wüstner, P., and Wyrwa, D.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The $pp \to pp \eta^{\prime}$ (958) reaction has been measured at COSY using the internal beam and the COSY-11 facility. The total cross sections at the four different excess energies \mbox{$ Q = ~1.5 ~MeV, ~1.7 ~MeV, ~2.9 ~MeV,$ and $ ~4.1 MeV$} have been evaluated to be \mbox{$ \sigma = 2.5 \pm 0.5~nb$, $~~~ 2.9 \pm 1.1~nb$, $~~~ 12.7 \pm 3.2~nb$, ~ and $~~~ 25.2 \pm 3.6 ~nb $}, respectively. In this region of excess energy the $\eta^{\prime}$ (958) cross sections are much lower compared to those of the $\pi ^0$ and $\eta$ production., Comment: 11 pages, 3 figures

Published
1998
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19. Total Cross Section of the Reaction pp \to pK^+\Lambda Close to Threshold

Author

Balewski, J. T., Budzanowski, A., Dombrowski, H., Eyrich, W., Goodman, C., Grzonka, D., Haidenbauer, J., Hanhart, C., Hauffe, J., Jarczyk, L., Jochmann, M., Khoukaz, A., Kilian, K., Köhler, M., Kozela, A., Lister, T., Metzger, A., Moskal, P., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Seddik, U., Sefzick, T., Smyrski, J., Sokołowski, M., Stinzing, F., Strzałkowski, A., Thomas, C., Wirth, S., Wolke, M., Woodward, R., Wüstner, P., and Wyrwa, D.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The energy dependence of the total cross section for the pp \to pK^+\Lambda reaction was measured in the threshold region covering the excess energy range up to 7MeV. Existing model calculations describe the slope of the measured cross sections well, but are too low by a factor of two to three in rate. The data were used for a precise determination of the beam momentum of the COSY-synchrotron., Comment: 11 pages, 5 figures

Published
1998
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20. Total and differential cross-sections for the $pp\rightarrow pp\eta^\prime$ reaction near threshold

Author

Khoukaz, A., Geck, I., Quentmeier, C., Adam, H.-H., Budzanowski, A., Czyżykiewicz, R., Grzonka, D., Jarczyk, L., Kilian, K., Kowina, P., Lang, N., Lister, T., Moskal, P., Oelert, W., Piskor-Ignatowicz, C., Rożek, T., Santo, R., Schepers, G., Sefzick, T., Sewerin, S., Siemaszko, M., Smyrski, J., Strzałkowski, A., Täschner, A., Winter, P., Wolke, M., Wüstner, P., and Zipper, W.

Published
2004
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24. Energy dependence of the $\Lambda /\Sigma ^{0}$ production cross-section ratio in p-p interactions

Author

Kowina, P., Wolke, M., Adam, H.-H., Budzanowski, A., Czyżykiewicz, Rafał, Grzonka, D., Haidenbauer, J., Janusz, Michał, Jarczyk, Lucjan, Khoukaz, A., Kilian, K., Moskal, Paweł, Oelert, W., Piskor-Ignatowicz, Cezary, Przerwa, Joanna, Quentmeier, C., Rożek, T., Santo, R., Schepers, G., Sefzick, T., Siemaszko, M., Smyrski, Jerzy, Steltenkamp, S., Strzałkowski, Adam, Winter, P., Wüstner, P., and Zipper, W.

Subjects
range parameter, energy range, elementary particle, excess energy, energy dependence
Published
2004

26. Energy dependence of the near-threshold total cross-section for the $pp\rightarrow pp{\eta }'$ reaction

Author

Moskal, Paweł, Adam, H.-H., Balewski, J. T., Baru, V., Budzanowski, A., Grzonka, D., Haidenbauer, J., Jarczyk, L., Khoukaz, A., Kilian, K., Köhler, M., Kowina, P., Kudryavtsev, A., Lang, N., Lister, T., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Sefzick, T., Sewerin, S., Siemaszko, M., Smyrski, Jerzy, Strzałkowski, A., Wolke, M., Wüstner, P., and Zipper, W.

Published
2000

27. Total Cross Section of the Reaction pp \to pK^+��Close to Threshold

Author

Balewski, J. T., Budzanowski, A., Dombrowski, H., Eyrich, W., Goodman, C., Grzonka, D., Haidenbauer, J., Hanhart, C., Hauffe, J., Jarczyk, L., Jochmann, M., Khoukaz, A., Kilian, K., K��hler, M., Kozela, A., Lister, T., Metzger, A., Moskal, P., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Seddik, U., Sefzick, T., Smyrski, J., Soko��owski, M., Stinzing, F., Strza��kowski, A., Thomas, C., Wirth, S., Wolke, M., Woodward, R., W��stner, P., and Wyrwa, D.

Subjects
Nuclear Theory (nucl-th), FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

The energy dependence of the total cross section for the pp \to pK^+��reaction was measured in the threshold region covering the excess energy range up to 7MeV. Existing model calculations describe the slope of the measured cross sections well, but are too low by a factor of two to three in rate. The data were used for a precise determination of the beam momentum of the COSY-synchrotron., 11 pages, 5 figures

Published
1998
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28. Drift chamber with a c-shaped frame

Author

Smyrski, J., primary, Kolf, Ch., additional, Adam, H.-H., additional, Budzanowski, A., additional, Czyżykiewicz, R., additional, Grzonka, D., additional, Heczko, A., additional, Janusz, M., additional, Jarczyk, L., additional, Kamys, B., additional, Khoukaz, A., additional, Kilian, K., additional, Kowina, P., additional, Misiak, A., additional, Moskal, P., additional, Oelert, W., additional, Piskor-Ignatowicz, C., additional, Przerwa, J., additional, Quentmeier, C., additional, Rożek, T., additional, Santo, R., additional, Schepers, G., additional, Sefzick, T., additional, Siemaszko, M., additional, Täschner, A., additional, Winter, P., additional, Wolke, M., additional, Wüstner, P., additional, and Zipper, W., additional

Published
2005
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29. Energy dependence of the Λ/Σproduction cross-section ratio in p-p interactions

Author

Kowina, P., primary, Wolke, M., additional, Adam, H. -H., additional, Budzanowski, A., additional, Czyżykiewicz, R., additional, Grzonka, D., additional, Haidenbauer, J., additional, Janusz, M., additional, Jarczyk, L., additional, Khoukaz, A., additional, Kilian, K., additional, Moskal, P., additional, Oelert, W., additional, Piskor-Ignatowicz, C., additional, Przerwa, J., additional, Quentmeier, C., additional, Rożek, T., additional, Santo, R., additional, Schepers, G., additional, Sefzick, T., additional, Siemaszko, M., additional, Smyrski, J., additional, Steltenkamp, S., additional, Strzałkowski, A., additional, Winter, P., additional, Wüstner, P., additional, and Zipper, W., additional

Published
2004
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30. Upper limit for the cross-section of the overlapping scalar resonancesf0(980) anda0(980) produced in proton–proton collisions in the range of the reaction threshold

Author

Moskal, P, primary, Adam, H-H, additional, Budzanowski, A, additional, Czyzykiewicz, R, additional, Grzonka, D, additional, Janusz, M, additional, Jarczyk, L, additional, Kamys, B, additional, Khoukaz, A, additional, Kilian, K, additional, Kolf, C, additional, Kowina, P, additional, Lister, T, additional, Oelert, W, additional, Piskor-Ignatowicz, C, additional, Przerwa, J, additional, Quentmeier, C, additional, Rozek, T, additional, Santo, R, additional, Schepers, G, additional, Sefzick, T, additional, Siemaszko, M, additional, Smyrski, J, additional, Strza kowski, A, additional, T schner, A, additional, Winter, P, additional, Wolke, M, additional, W stner, P, additional, and Zipper, W, additional

Published
2003
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31. Analysing power Ay in the reaction p→p→ppη close to threshold

Author

Winter, P., primary, Adam, H.-H., additional, Bauer, F., additional, Budzanowski, A., additional, Czyżykiewicz, R., additional, Götz, T., additional, Grzonka, D., additional, Jarczyk, L., additional, Khoukaz, A., additional, Kilian, K., additional, Kolf, C., additional, Kowina, P., additional, Lang, N., additional, Lister, T., additional, Moskal, P., additional, Oelert, W., additional, Quentmeier, C., additional, Rożek, T., additional, Santo, R., additional, Schepers, G., additional, Sefzick, T., additional, Siemaszko, M., additional, Smyrski, J., additional, Steltenkamp, S., additional, Strzałkowski, A., additional, Wolke, M., additional, Wüstner, P., additional, and Zipper, W., additional

Published
2002
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32. Experimental results on strangeness production in proton$ndash$proton collisions at COSY

Author

Moskal, P, primary, Adam, H-H, additional, Budzanowski, A, additional, Czy$\dot z$ykiewicz, R, additional, Grzonka, D, additional, Kolf, C, additional, Jarczyk, L, additional, Khoukaz, A, additional, Kilian, K, additional, Kowina, P, additional, Lang, N, additional, Lister, T, additional, Oelert, W, additional, Quentmeier, C, additional, Santo, R, additional, Schepers, G, additional, Sefzick, T, additional, Siemaszko, M, additional, Smyrski, J, additional, Strza$lslash$kowski, A, additional, Winter, P, additional, Wolke, M, additional, W$uuml$stner, P, additional, and Zipper, W, additional

Published
2002
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33. Recent results from the COSY-11 experiment on near-threshold meson production in pp and pd collisions

Author

Smyrski, J., primary, Adam, H. H., additional, Budzanowski, A., additional, Grzonka, D., additional, Jarczyk, L., additional, Khoukaz, A., additional, Kilian, K., additional, Kolf, C., additional, Kowina, P., additional, Lang, N., additional, Lister, T., additional, Moskal, P., additional, Oelert, W., additional, Quentmeier, C., additional, Santo, R., additional, Schepers, G., additional, Sefzick, T., additional, Sewerin, S., additional, Siemaszko, M., additional, Strzałkowski, A., additional, Winter, P., additional, Wolke, M., additional, Wüstner, P., additional, and Zipper, W., additional

Published
2002
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34. On the close to threshold meson production in neutron–neutron collisions

Author

Moskal, P, primary, Adam, H.-H, additional, Budzanowski, A, additional, Götz, T, additional, Grzonka, D, additional, Jarczy, L, additional, Khoukaz, A, additional, Kilian, K, additional, Kolf, C, additional, Kowina, P, additional, Lang, N, additional, Lister, T, additional, Oelert, W, additional, Quentmeier, C, additional, Santo, R, additional, Schepers, G, additional, Sefzick, T, additional, Siemaszko, M, additional, Smyrski, J, additional, Steltenkamp, S, additional, Strzałkowski, A, additional, Winter, P, additional, Wolke, M, additional, Wüstner, P, additional, and Zipper, W, additional

Published
2001
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35. Near threshold K+K− meson-pair production in proton–proton collisions

Author

Quentmeier, C., primary, Adam, H.-H., additional, Balewski, J.T., additional, Budzanowski, A., additional, Grzonka, D., additional, Jarczyk, L., additional, Khoukaz, A., additional, Kilian, K., additional, Kowina, P., additional, Lang, N., additional, Lister, T., additional, Moskal, P., additional, Oelert, W., additional, Santo, R., additional, Schepers, G., additional, Sefzick, T., additional, Sewerin, S., additional, Siemaszko, M., additional, Smyrski, J., additional, Strzałkowski, A., additional, Wolke, M., additional, Wüstner, P., additional, and Zipper, W., additional

Published
2001
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36. Monitoring of the accelerator beam distributions for internal target facilities

Author

Moskal, P., primary, Adam, H.-H., additional, Budzanowski, A., additional, Grzonka, D., additional, Jarczyk, L., additional, Khoukaz, A., additional, Kilian, K., additional, Kowina, P., additional, Lang, N., additional, Lister, T., additional, Oelert, W., additional, Quentmeier, C., additional, Santo, R., additional, Schepers, G., additional, Sefzick, T., additional, Sewerin, S., additional, Siemaszko, M., additional, Smyrski, J., additional, Strzałkowski, A., additional, Wolke, M., additional, Wüstner, P., additional, and Zipper, W., additional

Published
2001
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37. Near threshold K[sup +]K[sup -] meson-pair production in proton-proton collisions.

Author

Khoukaz, A., Quentmeier, C., Adam, H.-H., Balewski, J. T., Budzanowski, A., Grzonka, D., Jarczyk, L., Kilian, K., Kowina, P., Lang, N., Lister, T., Moskal, P., Oelert, W., Santo, R., Schepers, G., Sefzick, T., Sewerin, S., Siemaszko, M., Smyrski, J., and Strzalkowski, A.

Subjects
*MESONS, *PROTON-proton interactions
Abstract

The near threshold total cross section and angular distributions of K[sup +]K[sup -] pair production via the reaction pp → ppK[sup +]K[sup -] have been studied at an excess energy of Q - 17 MeV using the COSY-11 facility at the cooler synchrotron COSY. The obtained cross section as well as an upper limit at an excess energy of Q = 3 MeV represent the first measurements on the K[sup +]K[sup -] production in the region of small excess energies where production via the channel pp → ppφ → ppK[sup +]K[sup -] is energetically forbidden. [ABSTRACT FROM AUTHOR]

Published
2001

38. Hyperon and charged kaon pair production close to threshold.

Author

Wolke, M., Adam, H.-H., Balewski, J. T., Budzanowski, A., Goodman, C., Grzonka, D., Jarczyk, L., Jochmann, M., Khoukaz, A., Kilian, K., Ko¨hler, M., Kowina, P., Lister, T., Moskal, P., Lang, N., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., and Seddik, U.

Subjects
HYPERONS, PROTON-proton interactions
Abstract

Close-to-threshold data on the elementary kaon and antikaon production channels in the proton-proton interaction have been taken using the COSY-11 installation at the cooler synchrotron COSY Ju¨lich. The experimental technique applied at the internal COSY-11 facility—designed for meson production studies at small excess energies—is outlined. The threshold excitation functions for the kaon-hyperon production via the reactions pp→pK[sup +]Λ and pp→pK[sup +]Σ[sup 0] are presented. The magnitude of the production amplitudes is compared at equal excess energies and physical implications of the observed Σ[sup 0] suppression in the threshold region are discussed. In addition, within a Dalitz plot analysis the spin-averaged S-wave scattering parameters could be extracted for the Λ-p channel. With the possibility of detecting all final state particles the elementary antikaon production in the reaction pp→ppK[sup +]K[sup -] has been investigated. Results on the exclusive total cross section fix the scale of the strangeness dissociation into two kaons. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2000

39. Heavy meson production at COSY-11.

Author

Moskal, P., Adam, H.-H., Balewski, J. T., Budzanowski, A., Goodman, C., Grzonka, D., Jarczyk, L., Jochmann, M., Khoukaz, A., Kilian, K., Kowina, P., Ko¨hler, M., Lister, T., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Seddik, U., Sefzick, T., and Sewerin, S.

Subjects
MESONS, PROTON-proton interactions, LAGRANGE equations
Abstract

The COSY-11 collaboration has measured the total cross section for the pp→ppη[sup ′] and pp→ppη reactions in the excess energy range from Q=1.5 MeV to Q=23.6 MeV and from Q=0.5 MeV to Q=5.4 MeV, respectively. Measurements have been performed with the total luminosity of 73 nb-1 for the pp→ppη reaction and 1360 nb-1 for the pp→ppη[sup ′] one. Recent results are presented and discussed. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2000

40. S-wave η′-proton FSI; phenomenological analysis of near-threshold production of π0, η, and η′ mesons in proton-proton collisions

Author

Moskal, P, primary, Adam, H.-H, additional, Balewski, J.T, additional, Budzanowski, A, additional, Budziński, J, additional, Grzonka, D, additional, Jarczyk, L, additional, Khoukaz, A, additional, Kilian, K, additional, Kowina, P, additional, Lang, N, additional, Lister, T, additional, Oelert, W, additional, Quentmeier, C, additional, Santo, R, additional, Schepers, G, additional, Sefzick, T, additional, Sewerin, S, additional, Siemaszko, M, additional, Smyrski, J, additional, Strzałkowski, A, additional, Wolke, M, additional, Wüstner, P, additional, and Zipper, W, additional

Published
2000
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41. Near-threshold η meson production in proton–proton collisions

Author

Smyrski, J., primary, Wüstner, P., additional, Balewski, J.T., additional, Budzanowski, A., additional, Dombrowski, H., additional, Grzonka, D., additional, Jarczyk, L., additional, Jochmann, M., additional, Khoukaz, A., additional, Kilian, K., additional, Kowina, P., additional, Köhler, M., additional, Lister, T., additional, Moskal, P., additional, Oelert, W., additional, Quentmeier, C., additional, Santo, R., additional, Schepers, G., additional, Seddik, U., additional, Sefzick, T., additional, Sewerin, S., additional, Strzałkowski, A., additional, and Wolke, M., additional

Published
2000
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42. Energy dependence of the near-threshold total cross-section for the pp→ppη′ reaction

Author

Moskal, P., primary, Adam, H.-H., additional, Balewski, J.T., additional, Baru, V., additional, Budzanowski, A., additional, Grzonka, D., additional, Haidenbauer, J., additional, Jarczyk, L., additional, Khoukaz, A., additional, Kilian, K., additional, Köhler, M., additional, Kowina, P., additional, Kudryavtsev, A., additional, Lang, N., additional, Lister, T., additional, Oelert, W., additional, Quentmeier, C., additional, Santo, R., additional, Schepers, G., additional, Sefzick, T., additional, Sewerin, S., additional, Siemaszko, M., additional, Smyrski, J., additional, Strzałkowski, A., additional, Wolke, M., additional, Wüstner, P., additional, and Zipper, W., additional

Published
2000
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43. Near threshold hyperon-production at COSY-11 in the reactions pp → pK+Λ and pp → pK+Σ0

Author

Sewerin, S., primary, Balewski, J.T., additional, Budzanowski, A., additional, Goodman, C., additional, Grzonka, D., additional, Jarczyk, L., additional, Jochmann, M., additional, Khoukaz, A., additional, Kilian, K., additional, Köhler, M., additional, Lister, T., additional, Moskal, P., additional, Oelert, W., additional, Quentmeier, C., additional, Santo, R., additional, Schepers, G., additional, Seddik, U., additional, Sefzick, T., additional, Smyrski, J., additional, Strzałkowski, A., additional, Wolke, M., additional, Wüstner, P., additional, Eyrich, W., additional, Fritsch, M., additional, Haidenbauer, J., additional, Hanhart, C., additional, Stinzing, F., additional, and Wilkin, C., additional

Published
2000
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44. Near threshold production of η, η′ and charged kaon pairs in proton-proton collisions

Author

Khoukaz, A., primary, Adam, H.-H., additional, Balewski, J.T., additional, Budzanowski, A., additional, Goodman, C., additional, Grzonka, D., additional, Jarczyk, L., additional, Jochmann, M., additional, Kilian, K., additional, Lang, N., additional, Lister, T., additional, Moskal, P., additional, Oelert, W., additional, Quentmeier, C., additional, Santo, R., additional, Schepers, G., additional, Seddik, U., additional, Sefzick, T., additional, Sewerin, S., additional, Smyrski, J., additional, Strzalkowski, A., additional, Wolke, M., additional, Wüstner, P., additional, and Wyrwa, D., additional

Published
2000
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45. Comparison ofΛandΣ0Production near Threshold in Proton-Proton Collisions

Author

Sewerin, S., primary, Schepers, G., additional, Balewski, J. T., additional, Budzanowski, A., additional, Eyrich, W., additional, Fritsch, M., additional, Goodman, C., additional, Grzonka, D., additional, Haidenbauer, J., additional, Hanhart, C., additional, Hofmann, M., additional, Jarczyk, L., additional, Jochmann, M., additional, Khoukaz, A., additional, Kilian, K., additional, Köhler, M., additional, Lister, T., additional, Moskal, P., additional, Oelert, W., additional, Pellmann, I., additional, Quentmeier, C., additional, Santo, R., additional, Seddik, U., additional, Sefzick, T., additional, Smyrski, J., additional, Stinzing, F., additional, Strzałkowski, A., additional, Wilkin, C., additional, Wolke, M., additional, Wüstner, P., additional, and Wyrwa, D., additional

Published
1999
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46. Low-energy Λ–p scattering parameters from the pp → pK+Λ Reaction

Author

Balewski, J.T., primary, Budzanowski, A., additional, Goodman, C., additional, Grzonka, D., additional, Hofmann, M., additional, Jarczyk, L., additional, Khoukaz, A., additional, Kilian, K., additional, Lister, T., additional, Moskal, P., additional, Oelert, W., additional, Pellmann, I.A., additional, Quentmeier, C., additional, Santo, R., additional, Schepers, G., additional, Sefzick, T., additional, Sewerin, S., additional, Smyrski, J., additional, Strzałkowski, A., additional, Thomas, C., additional, Wilkin, C., additional, Wolke, M., additional, Wüstner, P., additional, and Wyrwa, D., additional

Published
1998
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47. η′Production in Proton-Proton Scattering Close to Threshold

Author

Moskal, P., primary, Balewski, J. T., additional, Budzanowski, A., additional, Dombrowski, H., additional, Goodman, C., additional, Grzonka, D., additional, Haidenbauer, J., additional, Hanhart, C., additional, Jarczyk, L., additional, Jochmann, M., additional, Khoukaz, A., additional, Kilian, K., additional, Köhler, M., additional, Kozela, A., additional, Lister, T., additional, Meißner, U.-G., additional, Nikolaev, N., additional, Oelert, W., additional, Quentmeier, C., additional, Santo, R., additional, Schepers, G., additional, Seddik, U., additional, Sefzick, T., additional, Smyrski, J., additional, Sokołowski, M., additional, Strzałkowski, A., additional, Thomas, C., additional, Wolke, M., additional, Wüstner, P., additional, and Wyrwa, D., additional

Published
1998
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48. Total cross section of the reaction pp→pK+Λ close to threshold

Author

Balewski, J.T, primary, Budzanowski, A, additional, Dombrowski, H, additional, Eyrich, W, additional, Goodman, C, additional, Grzonka, D, additional, Haidenbauer, J, additional, Hanhart, C, additional, Hauffe, J, additional, Jarczyk, L, additional, Jochmann, M, additional, Khoukaz, A, additional, Kilian, K, additional, Köhler, M, additional, Kozela, A, additional, Lister, T, additional, Metzger, A, additional, Moskal, P, additional, Oelert, W, additional, Quentmeier, C, additional, Santo, R, additional, Schepers, G, additional, Seddik, U, additional, Sefzick, T, additional, Smyrski, J, additional, Sokołowski, M, additional, Stinzing, F, additional, Strzałkowski, A, additional, Thomas, C, additional, Wirth, S, additional, Wolke, M, additional, Woodward, R, additional, Wüstner, P, additional, and Wyrwa, D, additional

Published
1998
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49. Threshold measurements at the internal experimental facility COSY-11

Author

Balewski, J., primary, Brauksiepe, S., additional, Budzanowski, A., additional, Dombrowski, H., additional, Goodman, C., additional, Grzonka, D., additional, Haidenbauer, J., additional, Hanhart, C., additional, Hardt, A., additional, Jarczyk, L., additional, Jochmann, M., additional, Khoukaz, A., additional, Kilian, K., additional, Köhler, M., additional, Kozela, A., additional, Lister, T., additional, Maier, R., additional, Moskal, P., additional, Oelert, W., additional, Prasuhn, D., additional, Quentmeier, C., additional, Santo, R., additional, Schepers, G., additional, Seddik, U., additional, Sefzick, T., additional, Smyrski, J., additional, Sokolowski, M., additional, Strzalkowski, A., additional, Wolke, M., additional, and Wüstner, P., additional

Published
1997
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50. Λ-hyperon production via the pp → pK+Λ reaction 2 MeV above threshold

Author

Balewski, J.T, primary, Budzanowski, A, additional, Dombrowski, H, additional, Goodman, C, additional, Grzonka, D, additional, Haidenbauer, J, additional, Hanhart, C, additional, Jarczyk, L, additional, Jochmann, M, additional, Khoukaz, A, additional, Kilian, K, additional, Köhler, M, additional, Kozela, A, additional, Lister, T, additional, Maier, R, additional, Moskal, P, additional, Oelert, W, additional, Prasuhn, D, additional, Quentmeier, C, additional, Santo, R, additional, Schepers, G, additional, Seddik, U, additional, Sefzick, T, additional, Smyrski, J, additional, Sokołowski, M, additional, Strzałkowski, A, additional, Wolke, M, additional, and Wüstner, P, additional

Published
1996
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