Search

Your search keyword '"SITTERBERG, K"' showing total 116 results
Start Over Author "SITTERBERG, K"

Refine your results

116 results on '"SITTERBERG, K"'

1. Backward single-pion production in the $\boldsymbol{pd\rightarrow {}^3\textrm{He}\,\pi^0}$ reaction with WASA-at-COSY

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C. -O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, A., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Morsch, H. --P., Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, A., Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, M. J., Złomańczuk, J., Żuprański, P., Żurek, M., and Wilkin, C.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

New data on the production of single neutral pions in the $pd\rightarrow{}^3\textrm{He}\,\pi^0$ reaction are presented. For fifteen proton beam momenta between $p_p=1.60\;\textrm{GeV}/c$ and $p_p=1.74\;\textrm{GeV}/c$, differential cross sections are determined over a large fraction of the backward hemisphere. Since the only previous systematic measurements of single-pion production at these energies were made in collinear kinematics, the present work constitutes a significant extension of the current knowledge on this reaction. Even this far above the production threshold, significant changes are found in the behaviour of the angular distributions over small intervals in beam momentum., Comment: 9 pages, 5 figures, 3 tables submitted to EPJA

Published
2018
Full Text
View/download PDF

2. Search for $C$ violation in the decay $\eta\rightarrow\pi^0+e^++e^-$ with WASA-at-COSY

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C. -O., Hanhart, C., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, A., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Morsch, H. -P., Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, A., Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, M. J., Złomańczuk, J., Żuprański, P., Żurek, M., and Wirzba, A.

Subjects
High Energy Physics - Experiment
Abstract

We report on the investigation of the rare decay $\eta\rightarrow\pi^0+\text{e}^++\text{e}^-$ which is of interest to study both $C$ violation in the electromagnetic interaction and to search for contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum J\"ulich, Germany. In total $3\times10^7$ events of the reaction $\text{p}+\text{d}\rightarrow{^3\text{He}}+\eta$ have been recorded at an excess energy of $Q = 59.8\,\textrm{MeV}$. Based on this data set the $C$ parity violating decay $\eta\rightarrow\pi^0+\gamma^*\rightarrow\pi^0+\textrm{e}^++\textrm{e}^-$ via a single-photon intermediate state has been searched for, resulting in new upper limits of $\Gamma\left(\eta\rightarrow\pi^0+\textrm{e}^++\textrm{e}^-\right)/ \Gamma\left(\eta\rightarrow\pi^++\pi^-+\pi^0\right) < 3.28\times10^{-5}$ and $\Gamma\left(\eta\rightarrow\pi^0+\textrm{e}^++\textrm{e}^-\right)/ \Gamma\left(\eta\rightarrow\textrm{all}\right) < 7.5\times10^{-6}\ (\textrm{CL} = 90\,\%)$, respectively., Comment: 7 pages, 8 figures, submitted to PLB

Published
2018
Full Text
View/download PDF

3. Total and differential cross sections of $\eta$-production in proton-deuteron fusion for excess energies between $Q_\eta=13\;\text{MeV}$ and $Q_\eta=81\;\text{MeV}$

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C. -O., Hanhart, C., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, A., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Morsch, H. -P., Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawanta, S., Schadmand, S., Schätti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, A., Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, M. J., Złomańczuk, J., Żuprański, P., Żurek, M., and Wilkin, C.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

New data on both total and differential cross sections of the production of $\eta$ mesons in proton-deuteron fusion to ${}^3\text{He}\,\eta$ in the excess energy region $13.6\;\text{MeV}\leq Q_\eta \leq 80.9\;\text{MeV}$ are presented. These data have been obtained with the WASA-at-COSY detector setup located at the Forschungszentrum J\"ulich, using a proton beam at 15 different beam momenta between $p_p = 1.60\;\text{GeV}/c$ and $p_p = 1.74\;\text{GeV}/c$. While significant structure of the total cross section is observed in the energy region $20\;\text{MeV}\lesssim Q_\eta \lesssim 60\;\text{MeV}$, a previously reported sharp variation around $Q_\eta\approx 50\;\text{MeV}$ cannot be confirmed. Angular distributions show the typical forward-peaking that was reported elsewhere. For the first time, it is possible to study the development of these angular distributions with rising excess energy over a large interval., Comment: 8 pages, 7 figures, preprint submitted to Physics Letters B

Published
2018
Full Text
View/download PDF

4. Spin dependence of {\eta} meson production in proton-proton collisions close to threshold

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S. D., Bergmann, F. S., Berlowski, M., Bondar, A., Buscher, M., Calen, H., Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C. -O., Heijkenskjold, L., Hejny, V., Husken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Marianski, B., Morsch, H. -P., Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Szczurek, H. Stroher A., Trzcinski, A., Wolke, M., Wronska, A., Wustner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, J., Zupranski, P., and Zurek, M.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Theory
Abstract

Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high degree of the polarized proton beam of COSY, the reaction pp{\to} pp{\eta} has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay is determined with the precision improved by more than one order of magnitude with respect to previous results allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q = 15 MeV signaling s wave production with no evidence for higher partial waves. At Q = 72 MeV the data reveals strong interference of P s and P p partial waves and cancellation of (P p) and Ss*Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the {\eta} meson., Comment: Accepted for publication in Phys. Rev. Lett

Published
2017
Full Text
View/download PDF

5. Importance of d-wave contributions in the charge symmetry breaking reaction $dd \to {}^4\text{He}\pi^0$

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C. -O., Hanhart, C., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Morsch, H. -P., Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, A., Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, M. J., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment
Abstract

This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction $dd \to {}^4\text{He}\pi^0$ using the WASA-at-COSY detector setup at an excess energy of $Q = 60$ MeV. The determined differential cross section can be parametrized as $\text{d}\sigma/\text{d}\Omega = a + b\cos^{2}\theta^*$, where $\theta^*$ is the production angle of the pion in the center-of-mass coordinate system, and the results for the parameters are $a = \left(1.55 \pm 0.46 (\text{stat}) ^{+0.32}_{-0.8} (\text{syst}) \right)$ pb/sr and $b = \left(13.1 \pm 2.1 (\text{stat}) ^{+1.0}_{-2.7} (\text{syst})\right)$ pb/sr. The data are compatible with vanishing p-waves and a sizable d-wave contribution. This finding should strongly constrain the contribution of the $\Delta$ isobar to the $dd \to {}^4\text{He}\pi^0$ reaction and is, therefore, crucial for a quantitative understanding of quark mass effects in nuclear production reactions., Comment: 5 figures

Published
2017
Full Text
View/download PDF

6. Isoscalar Single-Pion Production in the Region of Roper and $d^*(2380)$ Resonances

Author

Collaboration, WASA-at-COSY, Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calen, H., Ciepał, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Grigoryev, A. Goswami K., Gullström, C. -O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemien, W., Kulessa, P., Kupsc, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Marianski, B., Morsch, H. -P., Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, M., Wronska, A., Wüstner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Złomanczuk, J., Zupranski, P., and Zurek, M.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Exclusive measurements of the quasi-free $pn \to pp\pi^-$ and $pp \to pp\pi^0$ reactions have been performed by means of $pd$ collisions at $T_p$ = 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region $T_p = 0.95 - 1.3$ GeV ($\sqrt s$ = 2.3 - 2.46 GeV), which includes the regions of $\Delta(1232)$, $N^*(1440)$ and $d^*(2380)$ resonance excitations. From these measurements the isoscalar single-pion production has been extracted, for which data existed so far only below $T_p$ = 1 GeV. We observe a substantial increase of this cross section above 1 GeV, which can be related to the Roper resonance $N^*(1440)$, the strength of which shows up isolated from the $\Delta$ resonance in the isoscalar $(N\pi)_{I=0}$ invariant-mass spectrum. No evidence for a decay of the dibaryon resonance $d^*(2380)$ into the isoscalar $(NN\pi)_{I=0}$ channel is found. An upper limit of 90 $\mu$b (90 $\%$ C.L.) corresponding to a branching ratio of 5 $\%$ has been deduced., Comment: erratum: the upper limit for the branching ratio of the decay $d^*(2380) \to (NN\pi)_{I=0}$ is a factor of two smaller than given in the previous version of this article

Published
2017

7. Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, 9 M., Calen, H., Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstroem, C. -O., Heijkenskjoeld, L., Hejny, V., Huesken, N., Jarczyk, L., Johansson, T., Kamys, B., Kelkar, N. G., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Marianski, B., Morsch, H. -P., Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schaetti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, M., Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, J., Zupranski, P., and Zurek, M.

Subjects
Nuclear Experiment
Abstract

The search for 4He-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd->3He n pi0 and dd->3He p pi- processes. The beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the dd->4He eta reaction ranging from Q=-70 MeV to Q=30 MeV. The luminosity was determined based on the dd->3He n reaction and quasi-free proton-proton scattering via dd->pp n_spectator n_spectator reactions. The excitation functions determined independently for the measured reactions do not reveal a structure which could be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the total cross sections for the bound state production and decay in dd->(4He-eta)_bound->3He n pi0 and dd->(4He-eta)_bound->3He p pi- processes were determined taking into account the isospin relation between both the channels considered. The results of the analysis depend on the assumptions of the N* momentum distribution in the anticipated mesic-4He. Assuming as in the previous works, that this is identical with the distribution of nucleons bound with 20 MeV in 4He, we determined that (for the mesic bound state width in the range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about 3 nb and about 6 nb for npi0 and ppi- channels, respectively. However, based on the recent theoretical findings of the N*(1535) momentum distribution in the N*-3He nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector acceptance decreases and hence the corresponding upper limits are 5 nb and 10 nb for npi0 and ppi- channels respectively., Comment: This article will be submitted to JHEP

Published
2016
Full Text
View/download PDF

8. Measurement of the $\omega \to \pi^+ \pi^- \pi^0$ Dalitz plot distribution

Author

Collaboration, The WASA-at-COSY, Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C. -O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Morsch, H. -P., Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, A., Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, M. J., Złomańczuk, J., Żuprański, P., Żurek, M., Kubis, B., and Leupold, S.

Subjects
Nuclear Experiment
Abstract

Using the production reactions $pd\to {}^3\mbox{He}\,\omega$ and $pp\to pp\omega$, the Dalitz plot distribution for the $\omega \to \pi^+ \pi^- \pi^0$ decay is studied with the WASA detector at COSY, based on a combined data sample of $ (4.408\pm 0.042) \times 10^4$ events. The Dalitz plot density is parametrised by a product of the $P$-wave phase space and a polynomial expansion in the normalised polar Dalitz plot variables $Z$ and $\phi$. For the first time, a deviation from pure $P$-wave phase space is observed with a significance of $4.1\sigma$. The deviation is parametrised by a linear term $1+2\alpha Z$, with $\alpha$ determined to be $+0.147\pm0.036$, consistent with the expectations of $\rho$-meson-type final-state interactions of the $P$-wave pion pairs., Comment: 8 pages, 7 figures

Published
2016
Full Text
View/download PDF

9. Search for an Isospin I =3 Dibaryon

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, M., Calen, H., Ciepa, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstroem, C. -O., Heijkenskjoeld, L., Hejny, V., Huesken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Marianski, B., Morsch, H. -P., Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pysniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schaetti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Strassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, M., Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zink, A., Zlomanczuk, J., Zupranski, P., and Zurek, M.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Various theoretical calculations based on QCD or hadronic interactions predict that in addition to the recently observed dibaryon resonance $d^*(2380)$ with $I(J^P) = 0(3^+)$ there should also exist a dibaryon resonance with mirrored quantum numbers $I(J^P) = 3(0^+)$. We report here on a search for such a $NN$-decoupled state in data on the $pp \to pp\pi^+\pi^+\pi^-\pi^-$ reaction. Since no clear-cut evidence has been found, we give upper limits for the production cross section of such a resonance in the mass range 2280 - 2500 MeV.

Published
2016
Full Text
View/download PDF

10. Measurement of the $\vec{n}p \to d\pi^0\pi^0$ Reaction with Polarized Beam in the Region of the $d^*(2380)$ Resonance

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calen, H., Ciepał, I., Clement, H., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C. -O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lawani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, . P., Mariański, B., Morsch, H. -P., Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prashun, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti--Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Täschner, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, A., Wüstner, P., Zabierowski, J., Zieliński, M. J., Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment
Abstract

We report on a high-statistics measurement of the most basic double pionic fusion reaction $\vec{n}p \to d\pi^0\pi^0$ over the energy region of the $d^*(2380)$ resonance by use of a polarized deuteron beam and observing the double fusion reaction in the quasifree scattering mode. The measurements were performed with the WASA detector setup at COSY. The data reveal substantial analyzing powers and confirm conclusions about the $d^*$ resonance obtained from unpolarized measurements. We also confirm the previous unpolarized data obtained under complementary kinematic conditions.

Published
2016
Full Text
View/download PDF

11. Measurements of Branching Ratios for $\eta$ Decays into Charged Particles

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Coderre, D., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C. -O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Mikirtychiants, M., Morsch, H. -P., Moskal, P., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Täschner, A., Trzciński, A., Varma, R., Wiedner, U., Wolke, M., Wrońska, A., Wüstner, P., Wurm, P., Yamamoto, A., Zabierowski, J., Zieliński, M. J., Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment
Abstract

The WASA-at-COSY experiment has collected $3\times10^{7}$ events with $\eta$-mesons produced via the reaction $pd\rightarrow{^{3}\textrm{He}}\eta$ at $\textrm{T} = 1.0 \textrm{GeV}$. Using this data set, we evaluate the branching ratios of the decays $\eta\to\pi^{+}\pi^{-}\gamma$, $\eta\to e^{+}e^{-}\gamma$, $\eta\to\pi^{+}\pi^{-}e^{+}e^{-}$ and $\eta\to e^{+}e^{-}e^{+}e^{-}$. The branching ratios are normalized to the $\eta\rightarrow\pi^{+}\pi^{-}\pi^{0}$ decay. In addition an upper limit on a $CP$-violating asymmetry in $\eta\rightarrow \pi^{+}\pi^{-}e^{+}e^{-}$ is extracted.

Published
2015
Full Text
View/download PDF

12. Corrigendum to “Isoscalar single-pion production in the region of Roper and d⁎(2380) resonances” [Phys. Lett. B 774 (2017) 599]

Author

Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bhatt, H., additional, Bondar, A., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Czerwiński, E., additional, Demmich, K., additional, Engels, R., additional, Erven, A., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hüsken, N., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khatri, G., additional, Khoukaz, A., additional, Khreptak, O., additional, Kirillov, D.A., additional, Kistryn, S., additional, Kleines, H., additional, Kłos, B., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Kuzmin, A., additional, Lalwani, K., additional, Lersch, D., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Morsch, H.-P., additional, Moskal, P., additional, Ohm, H., additional, Parol, W., additional, Perez del Rio, E., additional, Piskunov, N.M., additional, Prasuhn, D., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Rundel, O., additional, Sawant, S., additional, Schadmand, S., additional, Schätti-Ozerianska, I., additional, Sefzick, T., additional, Serdyuk, V., additional, Shwartz, B., additional, Sitterberg, K., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Trzciński, A., additional, Varma, R., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Yamamoto, A., additional, Zabierowski, J., additional, Zieliński, M.J., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional

Published
2020
Full Text
View/download PDF

13. Search for Violation in the Decay → with WASA-at-COSY

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F.S., Berłowski, M., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C.O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, A., Kirillov, D.A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Morsch, H.P., Moskal, P., Ohm, H., Parol, W., Perez del Rio, E., Piskunov, N.M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, A., Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, M.J., Złomańczuk, J., Żuprański, P., Żurek, M., and Wirzba, A.

Abstract

We report on the search for the rare decay η→π0e+e− which is of interest to study C violation in the electromagnetic interaction which would indicate contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum Jülich, Germany. In total 3×107 events of the reaction pd→3Heη have been recorded at an excess energy of Q=59.8MeV. Based on this data set the C parity violating decay η→π0γ⁎→π0e+e− via a single-photon intermediate state has been searched for, resulting in new upper limits of Γ(η→π0e+e−)/Γ(η→π+π−π0)<3.28×10−5 and Γ(η→π0e+e−)/Γ(η→all)<7.5×10−6 (CL=90%), respectively.

Published
2018

14. Search for C violation in the decay $\eta \rightarrow \pi ^{0}e^{+}e^{-}$ with WASA-at-COSY

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Buscher, M., Calen, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C.-O., Heijkenskjold, L., Hejny, V., Husken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Parol, W., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, Aleksandra, Wustner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomańczuk, J., Żuprański, P., Żurek, M., and Wirzba, A.

Published
2018

15. Total and differential cross sections of eta-production in proton-deuteron fusion for excess energies between Q(eta)=13 MeV and Q(eta)=81 MeV

Author

ADLARSON, P, AUGUSTYNIAK, W, BARDAN, W, BASHKANOV, M, BERGMANN, FS, BERLOWSKI, M, BONDAR, A, BUSCHER, M, CALEN, H, CIEPAL, I, CLEMENT, H, CZERWINSKI, E, DEMMICH, K, ENGELS, R, ERVENO, A, ERVEN, W, EYRICH, W, FEDORETS, P, FOHL, K, FRANSSON, K, GOLDENBAUM, F, GOSWAMI, A, GRIGORYEV, K, GULLSTROM, CO, HEIJKENSKJOLD, L, HEJNY, V, HUSKEN, N, JARCZYK, L, JOHANSSON, T, KAMYS, B, KEMMERLING, G, KHATRI, G, KHOUKAZ, A, KHREPTAK, A, KIRILLOV, DA, KISTRYN, S, KLEINES, H, KLOS, B, KRZEMIEN, W, KULESSA, P, KUPSC, A, KUZMIN, A, LALWANI, K, LERSCH, D, LORENTZ, B, MAGIERA, A, MAIER, R, MARCINIEWSKI, P, MARIANSKI, B, MORSCH, HP, MOSKAL, P, OHM, H, PAROL, W, DEL RIO, EP, PISKUNOVU, NM, PRASUHN, D, PSZCZEL, D, PYSZ, K, PYSZNIAK, A, RITMAN, J, ROY, A, RUDY, Z, RUNDEL, O, SAWANT, S, SCHADMAND, S, SCHATTI-OZERIANSKA, I, SEFZICK, T, SERDYUK, V, SHWARTZ, B, SITTERBERG, K, SKORODKO, T, SKURZOK, M, SMYRSKI, J, SOPOV, V, STASSEN, R, STEPANIAK, J, STEPHAN, E, STERZENBACH, G, STOCKHORST, H, STROHER, H, SZCZUREK, A, TRZCINSKI, A, WOLKE, M, WRONSKA, A, WUSTNER, P, YAMAMOTO, A, ZABIEROWSKI, J, ZIELINSKI, MJ, ZLOMANCZUK, J, ZUPRANSKI, P, ZUREK, M, and WILKIN, C

Subjects
REACTION NEAR-THRESHOLD, QUASI-FREE, eta meson, SMALL ANGLES, ELASTIC-SCATTERING, Proton-deuteron interactions, PD SCATTERING, Meson production, TENSOR ANALYZING POWER, MESONS, HE-3
Abstract

New data on both total and differential cross sections of the production of eta mesons in proton-deuteron fusion to He-3 eta in the excess energy region 13.6 MeV

Published
2018
Full Text
View/download PDF

16. Importance of d-wave contributions in the charge symmetry breaking reaction dd -> He-4 pi(0)

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oskar, Hanhart, C., Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Wolke, Magnus, Wronska, A., Wuenstner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.

Subjects
Subatomär fysik, Deuteron deuteron interactions, Astronomi, astrofysik och kosmologi, Charge symmetry breaking, Subatomic Physics, Astronomy, Astrophysics and Cosmology, High Energy Physics::Experiment, Pion production, Nuclear Experiment
Abstract

This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction dd -> He-4 pi(0) using the WASA-at-COSY detector setup at an excess energy of Q = 60 MeV. The determined differential cross section can be parametrized as d sigma/d Omega = a + b cos(2) theta*, where theta* is the production angle of the pion in the center-of-mass coordinate system, and the results for the parameters are a = (1.55 +/- 0.46(stat)(-0.8)(+0.32)(syst)) pb/sr and b = (13.1 +/- 2.1(stat)(-2.7)(+1.0)(syst)) pb/sr. The data are compatible with vanishing p-waves and a sizable d-wave contribution. This finding should strongly constrain the contribution of the A isobar to the dd -> He-4 pi(0) reaction and is, therefore, crucial for a quantitative understanding of quark mass effects in nuclear production reactions.

Published
2018

17. Importance of d-wave contributions in the charge symmetry breaking reaction $dd\rightarrow ^{4}He\pi^{0}$

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C.-O., Hanhart, C., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Parol, W., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
charge symmetry breaking, deuteron-deuteron interactions, pion production
Published
2018

18. Backward single-pion production in the $pd \rightarrow ^{3}He\pi ^{0}$ reaction with WASA-at-COSY

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bondar, A., Buscher, M., Calen, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C.-O., Heijkenskjold, L., Hejny, V., Husken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Parol, W., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stapaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroher, H., Szczurek, A., Trzciński, A., Wolke, M., Wrońska, Aleksandra, Wustner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomańczuk, J., Żuprański, P., Żurek, M., and Wilkin, C.

Published
2018

19. Search for C violation in the decay eta -> pi(0)e(+)e(-) with WASA-at-COSY

Author

ADLARSON, R, COLLABORATION, WAC, AUGUSTYNIAK, W, BARDAN, W, BASHKANOV, M, BERGMANN, FS, BERLOWSKI, M, BONDAR, A, BUESCHER, M, CALEN, H, CIEPAL, I, CLEMENT, H, CZERWINSKI, E, DEMMICH, K, ENGELS, R, ERVEN, A, ERVEN, W, EYRICH, W, FEDORETS, R, FOEHL, K, FRANSSON, K, GOLDENBAUM, F, GOSWAMI, A, GRIGORYEV, K, GULLSTROM, CO, HEIJKENSKJOLD, L, HEJNY, V, HUESKEN, N, JARCZYK, L, JOHANSSON, T, KAMYS, B, KEMMERLING, G, KHATRI, G, KHOUKAZ, A, KHREPTAK, A, KIRILLOV, DA, KISTRYN, S, KLEINES, H, KLOS, B, KRZEMIEN, W, KULESSA, R, KUPSC, A, KUZMIN, A, LALWANI, K, LERSCH, D, LORENTZ, B, MAGIERA, A, MAIER, R, MARCINIEWSKI, R, MARIANSKI, B, MORSCH, HP, MOSKAL, R, OHM, H, PAROL, W, RIO, EP, PISKUNOV, NM, PRASUHN, D, PSZCZEL, D, PYSZ, K, PYSZNIAK, A, RITMAN, J, ROY, A, RUDY, Z, RUNDEL, O, SAWANT, S, SCHADMAND, S, SCHATTI-OZERIANSKA, I, SEFZICK, T, SERDYUK, V, SHWARTZ, B, SITTERBERG, K, SKORODKO, T, SKURZOK, M, SMYRSKI, J, SOPOV, V, STASSEN, R, STEPANIAK, J, STEPHAN, E, STERZENBACH, G, STOCKHORST, H, STROEHER, H, SZCZUREK, A, TRZCINSKI, A, WOLKE, M, WRONSKA, A, WUESTNER, R, YAMAMOTO, A, ZABIEROWSKI, J, ZIELINSKI, MJ, ZLOMANCZUK, J, ZUPRANSKI, R, ZUREK, M, and WIRZBA, A

Subjects
CONSERVING DECAY, UPPER LIMIT
Abstract

We report on the search for the rare decay eta -> pi(0)e(+)e(-) which is of interest to study C violation in the electromagnetic interaction which would indicate contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum Julich, Germany. In total 3 x 10(7) events of the reaction pd -> He-3 eta have been recorded at an excess energy of Q = 59.8MeV. Based on this data set the C parity violating decay eta -> pi(0)gamma* -> pi(0)e(+)e(-) via a single-photon intermediate state has been searched for, resulting in new upper limits of Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> pi(+) pi(-) pi(0)) < 3.28 x 10(-5) and Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> all)< 7.5 x 10(-6) (CL=90%), respectively. (c) 2018 The Author. Published by Elsevier B.V.

Published
2018
Full Text
View/download PDF

20. Backward single-pion production in the pd -> He-3 pi(0)reaction with WASA-at-COSY

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oskar, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, A., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, Andzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Wolke, Magnus, Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., and Wilkin, C.

Subjects
Subatomär fysik, Astronomi, astrofysik och kosmologi, Subatomic Physics, Astronomy, Astrophysics and Cosmology, Nuclear Experiment
Abstract

New data on the production of single neutral pions in the pd -> He-3 pi(0) reaction are presented. For fifteen proton beam momenta between p(p) = 1.60GeV/c and p(p) = 1.74 GeV/c, differential cross sections are determined over a large fraction of the backward hemisphere. Since the only previous systematic measurements of single-pion production at these energies were made in collinear kinematics, the present work constitutes a significant extension of the current knowledge on this reaction. Even this far above the production threshold, significant changes are found in the behaviour of the angular distributions over small intervals in beam momentum.

Published
2018

21. Search for C violation in the decay eta -> pi(0)e(+)e(-) with WASA-at-COSY

Author

Adlarson, Patrik, Collaboration, WASA-at-COSY, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, R., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oskar, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, A., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, R., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, R., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, Andzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Wolke, Magnus, Wronska, A., Wuestner, R., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, R., Zurek, M., and Wirzba, A.

Subjects
Subatomär fysik, Astronomi, astrofysik och kosmologi, Subatomic Physics, Astronomy, Astrophysics and Cosmology
Abstract

We report on the search for the rare decay eta -> pi(0)e(+)e(-) which is of interest to study C violation in the electromagnetic interaction which would indicate contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum Julich, Germany. In total 3 x 10(7) events of the reaction pd -> He-3 eta have been recorded at an excess energy of Q = 59.8MeV. Based on this data set the C parity violating decay eta -> pi(0)gamma* -> pi(0)e(+)e(-) via a single-photon intermediate state has been searched for, resulting in new upper limits of Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> pi(+) pi(-) pi(0)) < 3.28 x 10(-5) and Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> all)< 7.5 x 10(-6) (CL=90%), respectively.

Published
2018

22. Importance of d-wave contributions in the charge symmetry breaking reaction dd -> He-4 pi(0)

Author

ADLARSON, P, AUGUSTYNIAK, W, BARDAN, W, BASHKANOV, M, BERGMANN, FS, BERLOWSKI, M, BONDAR, A, BUSCHER, M, CALEN, H, CIEPAL, I, CLEMENT, H, CZERWINSKI, E, DEMMICH, K, ENGELS, R, ERVEN, A, ERVEN, W, EYRICH, W, FEDORETS, P, FOHL, K, FRANSSON, K, GOLDENBAUM, F, GOSWAMI, A, GRIGORYEV, K, GULLSTROM, CO, HANHART, C, HEIJKENSKJOLD, L, HEJNY, V, HUSKEN, N, JARCZYK, L, JOHANSSON, T, KAMYS, B, KEMMERLING, G, KHATRI, G, KHOUKAZ, A, KHREPTAK, O, KIRILLOV, DA, KISTRYN, S, KLEINES, H, KLOS, B, KRZEMIEN, W, KULESSA, P, KUPSC, A, KUZMIN, A, LALWANI, K, LERSCH, D, LORENTZ, B, MAGIERA, A, MAIER, R, MARCINIEWSKI, P, MARIANSKI, B, MORSCH, HP, MOSKAL, P, OHM, H, PAROL, W, DEL RIO, EP, PISKUNOV, NM, PRASUHN, D, PSZCZEL, D, PYSZ, K, PYSZNIAK, A, RITMAN, J, ROY, A, RUDY, Z, RUNDEL, O, SAWANT, S, SCHADMAND, S, SCHATTI-OZERIANSKA, I, SEFZICK, T, SERDYUK, V, SHWARTZ, B, SITTERBERG, K, SKORODKO, T, SKURZOK, M, SMYRSKI, J, SOPOV, V, STASSEN, R, STEPANIAK, J, STEPHAN, E, STERZENBACH, G, STOCKHORST, H, STROHER, H, SZCZUREK, A, TRZCINSKI, A, WOLKE, M, WRONSKA, A, WUNSTNER, P, YAMAMOTO, A, ZABIEROWSKI, J, ZIELINSKI, MJ, ZLOMANCZUK, J, ZUPRANSKI, P, and ZUREK, M

Subjects
COLLISIONS, Deuteron deuteron interactions, Charge symmetry breaking, MESON PRODUCTION, Pion production, NEAR-THRESHOLD, COSY, QUARK MASSES
Abstract

This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction dd -> He-4 pi(0) using the WASA-at-COSY detector setup at an excess energy of Q = 60 MeV. The determined differential cross section can be parametrized as d sigma/d Omega = a + b cos(2) theta*, where theta* is the production angle of the pion in the center-of-mass coordinate system, and the results for the parameters are a = (1.55 +/- 0.46(stat)(-0.8)(+0.32)(syst)) pb/sr and b = (13.1 +/- 2.1(stat)(-2.7)(+1.0)(syst)) pb/sr. The data are compatible with vanishing p-waves and a sizable d-wave contribution. This finding should strongly constrain the contribution of the A isobar to the dd -> He-4 pi(0) reaction and is, therefore, crucial for a quantitative understanding of quark mass effects in nuclear production reactions. (C) 2018 The Author(s). Published by Elsevier B.V.

Published
2018

23. Measurement of the ω -> π+π−π0 Dalitz plot distribution

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F.S., Berłowski, M., Bhatt, H., Bondar, A., Buscher, M., Calen, H., Ciepał, I., Clement, H., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C.O., Heijkenskjold, L., Hejny, V., Husken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F.A., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D.A., Kistryn, S., Kleines, H., Kłos, Barbara, Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, H., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maierj, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, P., Ohm, H., Perez del Rio, E., Piskunov, N.M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, Elżbieta, Sterzenbach, G., Stockhorst, H., Stroher, H., Szczurek, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, A., Wustner, P., Yamamoto, A., Zabierowska, J., Zieliński, M.J., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Meson-Meson Interactions, Pi-Pi-Scattering, Vector Mesons, Light Mesons, Decays of Other Mesons
Abstract

Using the production reactions pd→He3ω and pp→ppω, the Dalitz plot distribution for the ω→π+π−π0 decay is studied with the WASA detector at COSY, based on a combined data sample of (4.408±0.042)×104 events. The Dalitz plot density is parametrised by a product of the P-wave phase space and a polynomial expansion in the normalised polar Dalitz plot variables Z and ϕ. For the first time, a deviation from pure P-wave phase space is observed with a significance of 4.1σ. The deviation is parametrised by a linear term 1+2αZ, with α determined to be +0.147±0.036, consistent with the expectations of ρ-meson-type final-state interactions of the P-wave pion pairs.

Published
2017

24. Search for C violation in the decay η → π0e+e− with WASA-at-COSY

Author

Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bondar, A., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Czerwiński, E., additional, Demmich, K., additional, Engels, R., additional, Erven, A., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hüsken, N., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khatri, G., additional, Khoukaz, A., additional, Khreptak, A., additional, Kirillov, D.A., additional, Kistryn, S., additional, Kleines, H., additional, Kłos, B., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Kuzmin, A., additional, Lalwani, K., additional, Lersch, D., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Morsch, H.-P., additional, Moskal, P., additional, Ohm, H., additional, Parol, W., additional, Perez del Rio, E., additional, Piskunov, N.M., additional, Prasuhn, D., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Rundel, O., additional, Sawant, S., additional, Schadmand, S., additional, Schätti-Ozerianska, I., additional, Sefzick, T., additional, Serdyuk, V., additional, Shwartz, B., additional, Sitterberg, K., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Trzciński, A., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Yamamoto, A., additional, Zabierowski, J., additional, Zieliński, M.J., additional, Złomańczuk, J., additional, Żuprański, P., additional, Żurek, M., additional, and Wirzba, A., additional

Published
2018
Full Text
View/download PDF

25. Total and differential cross sections of η-production in proton–deuteron fusion for excess energies between Q = 13 MeV and Q = 81 MeV

Author

Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bondar, A., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Czerwiński, E., additional, Demmich, K., additional, Engels, R., additional, Erven, A., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hüsken, N., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khatri, G., additional, Khoukaz, A., additional, Khreptak, A., additional, Kirillov, D.A., additional, Kistryn, S., additional, Kleines, H., additional, Kłos, B., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Kuzmin, A., additional, Lalwani, K., additional, Lersch, D., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Morsch, H.-P., additional, Moskal, P., additional, Ohm, H., additional, Parol, W., additional, Perez del Rio, E., additional, Piskunov, N.M., additional, Prasuhn, D., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Rundel, O., additional, Sawant, S., additional, Schadmand, S., additional, Schätti-Ozerianska, I., additional, Sefzick, T., additional, Serdyuk, V., additional, Shwartz, B., additional, Sitterberg, K., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Trzciński, A., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Yamamoto, A., additional, Zabierowski, J., additional, Zieliński, M.J., additional, Złomańczuk, J., additional, Żuprański, P., additional, Żurek, M., additional, and Wilkin, C., additional

Published
2018
Full Text
View/download PDF

26. Importance of d-wave contributions in the charge symmetry breaking reaction dd→4Heπ0

Author

Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bondar, A., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Czerwiński, E., additional, Demmich, K., additional, Engels, R., additional, Erven, A., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Hanhart, C., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hüsken, N., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khatri, G., additional, Khoukaz, A., additional, Khreptak, O., additional, Kirillov, D.A., additional, Kistryn, S., additional, Kleines, H., additional, Kłos, B., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Kuzmin, A., additional, Lalwani, K., additional, Lersch, D., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Morsch, H.-P., additional, Moskal, P., additional, Ohm, H., additional, Parol, W., additional, Perez del Rio, E., additional, Piskunov, N.M., additional, Prasuhn, D., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Rundel, O., additional, Sawant, S., additional, Schadmand, S., additional, Schätti-Ozerianska, I., additional, Sefzick, T., additional, Serdyuk, V., additional, Shwartz, B., additional, Sitterberg, K., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Trzciński, A., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Yamamoto, A., additional, Zabierowski, J., additional, Zieliński, M.J., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional

Published
2018
Full Text
View/download PDF

27. Total and differential cross sections of η-production in proton–deuteron fusion for excess energies between Qη = 13 MeV and Qη = 81 MeV

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erveno, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C. -O, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, A., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunovu, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, Andzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Wolke, Magnus, Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., Wilkin, C., Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erveno, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C. -O, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, A., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunovu, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, Andzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Wolke, Magnus, Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., and Wilkin, C.

Abstract

New data on both total and differential cross sections of the production of eta mesons in proton-deuteron fusion to He-3 eta in the excess energy region 13.6 MeV <= Q(eta) <= 80.9 MeV are presented. These data have been obtained with the WASA-at-COSY detector setup located at the Forschungszentrum Julich, using a proton beam at 15 different beam momenta between p(p) = 1.60 GeV/c and p(p) = 1.74 GeV/c. While significant structure of the total cross section is observed in the energy region 20 MeV less than or similar to Q(eta) less than or similar to 60 MeV, a previously reported sharp variation around Q(eta) approximate to 50 MeV cannot be confirmed. Angular distributions show the typical forward- peaking that was noted earlier. For the first time, it is possible to study the development of these angular distributions with rising excess energy over a wide interval., WoS title: Total and differential cross sections of eta-production in proton-deuteron fusion for excess energies between Q(eta)=13 MeV and Q(eta)=81 MeV

Published
2018
Full Text
View/download PDF

28. Spin Dependence of eta Meson Production in Proton-Proton Collisions Close to Threshold

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S. D., Bergmann, F. S., Berlowski, M., Bondar, A., Buscher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oskar, Heijkenskjöld, Lena, Hejny, V., Husken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Wolke, Magnus, Wronska, A., Wustner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S. D., Bergmann, F. S., Berlowski, M., Bondar, A., Buscher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oskar, Heijkenskjöld, Lena, Hejny, V., Husken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Wolke, Magnus, Wronska, A., Wustner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.

Abstract

Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high polarization degree of the proton beam of COSY, the reaction →pp→ppη has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay is determined with the precision improved by more than 1 order of magnitude with respect to previous results, allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q=15 MeV, signaling s-wave production with no evidence for higher partial waves. At Q=72 MeV the data reveal strong interference of Ps and Pp partial waves and cancellation of (Pp)2 and Ss∗Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the η meson.

Published
2018
Full Text
View/download PDF

29. Measurement of the omega -> pi(+)pi(-)pi(0) Dalitz plot distribution The WASA-at-COSY Collaboration

Author

ADLARSON, P, AUGUSTYNIAK, W, BARDAN, W, BASHKANOV, M, BERGMANN, FS, BERLOWSKI, M, BHATT, H, BONDAR, A, BUSCHER, M, CALEN, H, CIEPAL, I, CLEMENT, H, CZERWINSKI, E, DEMMICH, K, ENGELS, R, ERVEN, A, ERVEN, W, EYRICH, W, FEDORETS, P, FOHL, K, FRANSSON, K, GOLDENBAUM, F, GOSWAMI, A, GRIGORYEV, K, GULLSTROM, CO, HEIJKENSKJOLD, L, HEJNY, V, HUSKEN, N, JARCZYK, L, JOHANSSON, T, KAMYS, B, KEMMERLING, G, KHAN, FA, KHATRI, G, KHOUKAZ, A, KHREPTAK, O, KIRILLOV, DA, KISTRYN, S, KLEINES, H, KLOS, B, KRZEMIEN, W, KULESSA, P, KUPSC, A, KUZMIN, A, LALWANI, K, LERSCH, D, LORENTZ, B, MAGIERA, A, MAIER, R, MARCINIEWSKI, P, MARIANSKI, B, MORSCH, HP, MOSKAL, P, OHM, H, DEL RIO, EP, PISKUNOV, NM, PRASUHN, D, PSZCZEL, D, PYSZ, K, PYSZNIAK, A, RITMAN, J, ROY, A, RUDYC, Z, RUNDEL, O, SAWANT, S, SCHADMAND, S, SCHATTI-OZERIANSKA, I, SEFZICK, T, SERDYUK, V, SHWARTZ, B, SITTERBERG, K, SKORODKO, T, SKURZOK, M, SMYRSKI, J, SOPOV, V, STASSEN, R, STEPANIAK, J, STEPHAN, E, STERZENBACH, G, STOCKHORST, H, STROHER, H, SZCZUREK, A, TRZCINSKI, A, VARMA, R, WOLKE, M, WRONSKA, A, WUSTNER, P, YAMAMOTO, A, ZABIEROWSKI, J, ZIELINSKI, MJ, ZLOMANCZUK, J, ZUPRANSKI, P, ZUREK, M, KUBIS, B, and LEUPOLD, S

Subjects
Na60, Parity, Light Vector-Mesons, Meson-Meson Interactions, Pi-Pi-Scattering, Detector, Decays Of Other Mesons, Transition Form-Factors, Decays, Light Mesons, Eta, Dispersive Analysis, Mu(+)Mu(-)Gamma
Abstract

Using the production reactions pd -> He-3 omega and pp -> pp omega, the Dalitz plot distribution for the omega -> pi(+)pi(-)pi(0)decay is studied with the WASA detector at COSY, based on a combined data sample of (4.408 +/- 0.042) x 10(4) events. The Dalitz plot density is parametrised by a product of the P-wave phase space and a polynomial expansion in the normalised polar Dalitz plot variables Z and phi. For the first time, a deviation from pure P-wave phase space is observed with a significance of 4.1 sigma. The deviation is parametrised by a linear term 1+2 alpha Z, with alpha determined to be +0.147 +/- 0.036, consistent with the expectations of rho-meson-type final-state interactions of the P-wave pion pairs. (C) 2017 The Author. Published by Elsevier B.V.

Published
2017

30. Isoscalar single-pion production in the region of Roper and $d^{\star }$ (2380) resonances

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calen, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Grigoryev, A. Goswami K., Gullström, C.-O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupsc, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Marianski, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Parol, W., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomanczuk, J., Zupranski, P., and Zurek, M.

Subjects
isoscalar part, roper resonance, single-pion production, Dibaryon resonance
Published
2017

31. Measurement of the ω → π+π−π0 Dalitz plot distribution : The WASA-at-COSY Collaboration

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oscar, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marcinievski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, Magnus, Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., Kubis, B., and Leupold, Stefan

Subjects
Subatomär fysik, Astronomi, astrofysik och kosmologi, Subatomic Physics, Light mesons, Astronomy, Astrophysics and Cosmology, Meson-meson interactions, Decays of other mesons
Abstract

Using the production reactions pd -> He-3 omega and pp -> pp omega, the Dalitz plot distribution for the omega -> pi(+)pi(-)pi(0)decay is studied with the WASA detector at COSY, based on a combined data sample of (4.408 +/- 0.042) x 10(4) events. The Dalitz plot density is parametrised by a product of the P-wave phase space and a polynomial expansion in the normalised polar Dalitz plot variables Z and phi. For the first time, a deviation from pure P-wave phase space is observed with a significance of 4.1 sigma. The deviation is parametrised by a linear term 1+2 alpha Z, with alpha determined to be +0.147 +/- 0.036, consistent with the expectations of rho-meson-type final-state interactions of the P-wave pion pairs. (C) 2017 The Author. Published by Elsevier B.V. Title in WoS: Measurement of the omega -> pi(+)pi(-)pi(0) Dalitz plot distribution

Published
2017

32. Search for $\eta$-mesic $^{4}He$ in the $dd\rightarrow ^{3}Hen\pi ^{0}$ and $dd\rightarrow ^{3}Hep\pi ^{-}$ reactions with the WASA-at-COSY facility

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C.-O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kelkar, N. G., Kemmerling, G., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
η-Mesic nuclei, η meson
Published
2017

33. Measurement of the $\omega \rightarrow \pi ^{+}\pi ^{-}\pi ^{0}$ Dalitz plot distribution

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C.-O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khan, F. A., Khatri, Ghanshyambhai, Khoukaz, A., Khreptak, Aleksander, Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Zink, A., Złomańczuk, J., Żuprański, P., Żurek, M., Kubis, B., and Leupold, S.

Subjects
density, omega(783), statistical [error], parametrization [Dalitz plot], Juelich COSY PS, mass [pi], final-state interaction, decay [meson], omega(783) $\rightarrow pi^{+} pi^{-} pi^{0}$, Uppsala CELSIUS Stor, phase space, phase shift, kinematics, WASA, $pi^{+} pi^{-}$, experimental results
Published
2017

34. Measurement of the ω → π+π−π0 Dalitz plot distribution

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C.-O., Heijkenskjold, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Marianski, B., Morsch, H.-P., Moskal, P., Ohm, H., Perez Del Rio, E., Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, M., Wronska, A., Wüstner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, J., Zupranski, P., Zurek, M., Kubis, B., and Leupold, S.

Subjects
density, omega(783), Dalitz plot: parametrization, Juelich COSY PS, +pi%2B+pi-+pi0%22">omega(783) --> pi+ pi- pi0, final-state interaction, pi: mass, Uppsala CELSIUS Stor, error: statistical, phase shift, phase space, meson: decay, kinematics, pi+ pi, WASA, experimental results
Abstract

Physics letters / B 770, 418-425 (2017). doi:10.1016/j.physletb.2017.03.050, Published by North-Holland Publ., Amsterdam

Published
2017
Full Text
View/download PDF

35. Spin dependence of �� meson production in proton-proton collisions close to threshold

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S. D., Bergmann, F. S., Berlowski, M., Bondar, A., Buscher, M., Calen, H., Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C. -O., Heijkenskjold, L., Hejny, V., Husken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Marianski, B., Morsch, H. -P., Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Szczurek, H. Stroher A., Trzcinski, A., Wolke, M., Wronska, A., Wustner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, J., Zupranski, P., and Zurek, M.

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

Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high degree of the polarized proton beam of COSY, the reaction pp{\to} pp�� has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay is determined with the precision improved by more than one order of magnitude with respect to previous results allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q = 15 MeV signaling s wave production with no evidence for higher partial waves. At Q = 72 MeV the data reveals strong interference of P s and P p partial waves and cancellation of (P p) and Ss*Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the �� meson., Accepted for publication in Phys. Rev. Lett

Published
2017
Full Text
View/download PDF

36. Search for eta-mesic He-4 in the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) reactions with the WASA-at-COSY facility

Author

ADLARSON, P, AUGUSTYNIAK, W, BARDAN, W, BASHKANOV, M, BERGMANN, FS, BERLOWSKI, M, BHATT, H, BONDAR, A, BUSCHER, M, CALEN, H, CIEPAL, I, CLEMENT, H, CZERWINSKI, E, DEMMICH, K, ENGELS, R, ERVEN, A, ERVEN, W, EYRICH, W, FEDORETS, P, FOHL, K, FRANSSON, K, GOLDENBAUM, E, GOSWAMI, A, GRIGORYEV, K, GULLSTROM, CO, HEIJKENSKJOLD, L, HEJNY, V, HUSKEN, N, JARCZYK, L, JOHANSSON, T, KAMYS, B, KELKAR, NG, KEMMERLING, G, KHATRI, G, KHOUKAZ, A, KHREPTAK, O, KIRILLOV, DA, KISTRYN, S, KLEINES, H, KLOS, B, KRZEMIEN, W, KULESSA, P, KUPSC, A, KUZMIN, A, LALWANI, K, LERSCH, D, LORENTZ, B, MAGIERAE, A, MAIER, R, MARCINIEWSKI, P, MARIANSKI, B, MORSCH, HP, MOSKAL, P, OHM, H, DEL RIO, EP, PISKUNOV, NM, PRASUHN, D, PSZCZEL, D, PYSZ, K, PYSZNIAK, A, RITMAN, J, ROY, A, RUDY, Z, RUNDEL, O, SAWANT, S, SCHADMAND, S, SCHATTI-OZERIANSKA, I, SEFZICK, T, SERDYUK, V, SHWARTZ, B, SITTERBERG, K, SKORODKO, T, SKURZOK, M, SMYRSKI, J, SOPOV, V, STASSEN, R, STEPANIAK, J, STEPHAN, E, STERZENBACH, G, STOCKHORST, H, STROHER, H, SZCZUREK, A, TRZCINSKI, A, VARMA, R, WOLKE, M, WRONSKA, A, WUSTNER, P, YAMAMOTO, A, ZABIEROWSKI, J, ZIELINSKI, MJ, ZLOMANCZUK, J, ZUPRANSKI, P, and ZUREK, M

Subjects
Scattering, Eta-Mesic Nuclei, Eta Meson, Near-Threshold, Systems, Detector, Nuclei, Quasi-Bound States
Abstract

The search for He-4-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) processes. The deuteron beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the dd -> He-4 eta reaction ranging from Q = 70 MeV to Q = 30 MeV. The luminosity was determined based on the dd -> (3)Hen reaction and the quasi-free proton proton scattering via dd -> ppn(spectator)n(spectator) reactions. The excitation functions, determined independently for the measured reactions, do not reveal a structure which could be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the total cross sections for the bound state production and decay in dd -> (4He-eta)(bound) -> (3)Hen pi(0) and dd -> (He-4-eta)(bound) -> (3)Hep pi(-) processes were determined taking into account the isospin relation between the both of the considered channels. The results of the analysis depend on the assumptions of the N* (1535) momentum distribution in the anticipated mesic-He-4. Assuming, as in the previous works, that this is identical with the distribution of nucleons bound with 20 MeV in He-4, we determined that (for the mesic bound state width in the range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about 3 nb and about 6 nb for n pi(0) and p pi(-) channels, respectively. However, based on the recent theoretical findings of the N*(1535) momentum distribution in the N*-He-3 nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector acceptance decreases and hence the corresponding upper limits are 5 nb and 10 nb for n pi(0) and p pi(-) channels respectively. (C) 2017 Elsevier B.V. All rights reserved.

Published
2017

38. Search for an isospin I = 3 dibaryon

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C. O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Morsch, H. P., Moskal, P., Ohm, H., Perez del Rio, E., Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, A., Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, M. J., Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Various theoretical calculations based on QCD or hadronic interactions predict that in addition to the recently observed dibaryon resonance d⁎(2380) with I(JP)=0(3+) there should also exist a dibaryon resonance with mirrored quantum numbers I(JP)=3(0+). We report here on a search for such a NN-decoupled state in data on the pp→ppπ+π+π−π− reaction. Since no clear-cut evidence has been found, we give upper limits for the production cross section of such a resonance in the mass range 2280–2500 MeV.

Published
2016

39. Measurement of the $\vec{n}p\rightarrow d\pi ^{0}\pi ^{0}$ reaction with polarized beam in the region of the $d^{\ast }$ (2380) resonance

Author

Adlarson, P., Augustyniak, W., Bardan, Wiktor, Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Bondar, A., Büscher, M., Calén, H., Ciepał, Izabela, Clement, H., Czerwiński, Eryk, Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, C.-O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, Lucjan, Johansson, T., Kamys, Bogusław, Kemmerling, G., Khan, F. A., Khatri, Ghanshyambhai, Khoukaz, A., Kirillov, D. A., Kistryn, Stanisław, Kleines, H., Kłos, B., Krzemień, Wojciech, Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, Andrzej, Maier, R., Marciniewski, P., Mariański, B., Morsch, H.-P., Moskal, Paweł, Ohm, H., Perez del Rio, Elena, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Zbigniew, Rundel, Oleksandr, Sawant, S., Schadmand, S., Schätti - Ozerianska, Iryna, Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Siudak, R., Skorodko, T., Skurzok, Magdalena, Smyrski, Jerzy, Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Täschner, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, Aleksandra, Wüstner, P., Yamamoto, A., Zabierowski, J., Zieliński, Marcin, Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Published
2016

40. Measurement of the np → dπ0 π0 reaction with polarized beam in the region of the d*(2380) resonance

Author

Adlarson, P., Augustyniak, W., Ciepał, I., Clement, H., Czerwiński, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Bardan, W., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, Kirill, Gullström, C. -O., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Bashkanov, M., Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Bergmann, F. S., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, Rudolf, Marciniewski, P., Mariański, B., Berłowski, M., Morsch, H. -P., Moskal, P., Ohm, H., Perez del Rio, E., Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Bhatt, H., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Bondar, A., Siudak, R, Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Büscher, M., Ströher, H., Szczurek, A., Täschner, A., Trzciński, A., Varma, R., Wolke, M., Wrońska, A., Wüstner, P., Yamamoto, A., Zabierowski, J., Calén, H., Zieliński, M. J., Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
ddc:530
Abstract

The European physical journal / A 52(5), 147 (2016). doi:10.1140/epja/i2016-16147-5, Published by Springer, Berlin

Published
2016
Full Text
View/download PDF

41. Measurement of the $��\to ��^+ ��^- ��^0$ Dalitz plot distribution

Author

COSY Collaboration, Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Ber��owski, M., Bhatt, H., Bondar, A., B��scher, M., Cal��n, H., Ciepa��, I., Clement, H., Czerwi��ski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., F��hl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstr��m, C. -O., Heijkenskj��ld, L., Hejny, V., H��sken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., K��os, B., Krzemie��, W., Kulessa, P., Kup����, A., Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Maria��ski, B., Morsch, H. -P., Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Sch��tti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Str��her, H., Szczurek, A., Trzci��ski, A., Varma, R., Wolke, M., Wro��ska, A., W��stner, P., Yamamoto, A., Zabierowski, J., Zieli��ski, M. J., Z��oma��czuk, J., ��upra��ski, P., ��urek, M., Kubis, B., and Leupold, S.

Subjects
FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Using the production reactions $pd\to {}^3\mbox{He}\,��$ and $pp\to pp��$, the Dalitz plot distribution for the $��\to ��^+ ��^- ��^0$ decay is studied with the WASA detector at COSY, based on a combined data sample of $ (4.408\pm 0.042) \times 10^4$ events. The Dalitz plot density is parametrised by a product of the $P$-wave phase space and a polynomial expansion in the normalised polar Dalitz plot variables $Z$ and $��$. For the first time, a deviation from pure $P$-wave phase space is observed with a significance of $4.1��$. The deviation is parametrised by a linear term $1+2��Z$, with $��$ determined to be $+0.147\pm0.036$, consistent with the expectations of $��$-meson-type final-state interactions of the $P$-wave pion pairs., 8 pages, 7 figures

Published
2016
Full Text
View/download PDF

42. Measurement of the (n)over-right-arrowp -> d pi(0) pi(0) reaction with polarized beam in the region of the d(*)(2380) resonance

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buscher, M., Calén, Hans, Ciepa, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oscar, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schaetti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Taeschner, A., Trzcinski, A., Varma, R., Wolke, Magnus, Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zink, A., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.

Subjects
Subatomär fysik, Nuclear Theory, Subatomic Physics, Nuclear Experiment
Abstract

We report on a high-statistics measurement of the most basic double-pionic fusion reaction over the energy region of the d (*)(2380) resonance by use of a polarized deuteron beam and observing the double fusion reaction in the quasifree scattering mode. The measurements were performed with the WASA detector setup at COSY. The data reveal substantial analyzing powers and confirm conclusions about the d(*) resonance obtained from unpolarized measurements. We also confirm the previous unpolarized data obtained under complementary kinematic conditions.

Published
2016

43. Isoscalar single-pion production in the region of Roper and d ⁎ (2380) resonances

Author

Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bhatt, H., additional, Bondar, A., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Czerwiński, E., additional, Demmich, K., additional, Engels, R., additional, Erven, A., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hüsken, N., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khatri, G., additional, Khoukaz, A., additional, Khreptak, O., additional, Kirillov, D.A., additional, Kistryn, S., additional, Kleines, H., additional, Kłos, B., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Kuzmin, A., additional, Lalwani, K., additional, Lersch, D., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Morsch, H.-P., additional, Moskal, P., additional, Ohm, H., additional, Parol, W., additional, Perez del Rio, E., additional, Piskunov, N.M., additional, Prasuhn, D., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Rundel, O., additional, Sawant, S., additional, Schadmand, S., additional, Schätti-Ozerianska, I., additional, Sefzick, T., additional, Serdyuk, V., additional, Shwartz, B., additional, Sitterberg, K., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Trzciński, A., additional, Varma, R., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Yamamoto, A., additional, Zabierowski, J., additional, Zieliński, M.J., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional

Published
2017
Full Text
View/download PDF

44. Measurement of the ω→π+π−π0 Dalitz plot distribution

Author

Kubis, B., primary, Leupold, S., additional, Adlarson, P., additional, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bhatt, H., additional, Bondar, A., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Czerwiński, E., additional, Demmich, K., additional, Engels, R., additional, Erven, A., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hüsken, N., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khan, F.A., additional, Khatri, G., additional, Khoukaz, A., additional, Khreptak, O., additional, Kirillov, D.A., additional, Kistryn, S., additional, Kleines, H., additional, Kłos, B., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Kuzmin, A., additional, Lalwani, K., additional, Lersch, D., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Morsch, H.-P., additional, Moskal, P., additional, Ohm, H., additional, Perez del Rio, E., additional, Piskunov, N.M., additional, Prasuhn, D., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Rundel, O., additional, Sawant, S., additional, Schadmand, S., additional, Schätti-Ozerianska, I., additional, Sefzick, T., additional, Serdyuk, V., additional, Shwartz, B., additional, Sitterberg, K., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Trzciński, A., additional, Varma, R., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Yamamoto, A., additional, Zabierowski, J., additional, Zieliński, M.J., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional

Published
2017
Full Text
View/download PDF

45. Search for η-mesic He4 in the dd→He3nπ0 and dd→He3pπ− reactions with the WASA-at-COSY facility

Author

Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bhatt, H., additional, Bondar, A., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Czerwiński, E., additional, Demmich, K., additional, Engels, R., additional, Erven, A., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hüsken, N., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kelkar, N.G., additional, Kemmerling, G., additional, Khatri, G., additional, Khoukaz, A., additional, Khreptak, O., additional, Kirillov, D.A., additional, Kistryn, S., additional, Kleines, H., additional, Kłos, B., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Kuzmin, A., additional, Lalwani, K., additional, Lersch, D., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Morsch, H.-P., additional, Moskal, P., additional, Ohm, H., additional, Perez del Rio, E., additional, Piskunov, N.M., additional, Prasuhn, D., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Rundel, O., additional, Sawant, S., additional, Schadmand, S., additional, Schätti-Ozerianska, I., additional, Sefzick, T., additional, Serdyuk, V., additional, Shwartz, B., additional, Sitterberg, K., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Trzciński, A., additional, Varma, R., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Yamamoto, A., additional, Zabierowski, J., additional, Zieliński, M.J., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional

Published
2017
Full Text
View/download PDF

46. Isoscalar single-pion production in the region of Roper and d*(2380) resonances

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, M., Calen, H., Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oskar, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E. u, Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, Magnus, Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., Zurekj, M., Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, M., Calen, H., Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oskar, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E. u, Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, Magnus, Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., and Zurekj, M.

Abstract

Exclusive measurements of the quasi-free pn -> pp pi(-) and pp -> pp pi(0) reactions have been performed by means of pd collisions at T-p= 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region T-p= 0.95-1.3 GeV (root s = 2.3-2.46 GeV), which includes the regions of triangle(1232), N*(1440) and d*(2380) resonance excitations. From these measurements the isoscalar single-pion production has been extracted, for which data existed so far only below T-p = 1 GeV. We observe a substantial increase of this cross section around 1 GeV, which can be related to the Roper resonance N*(1440), the strength of which shows up isolated from the triangle resonance in the isoscalar (N pi)(I=0) invariant-mass spectrum. No evidence for a decay of the dibaryon resonance d*(2380) into the isoscalar (NN pi)(I=0) channel is found. An upper limit of 180 mu b (90% CL.) corresponding to a branching ratio of 9% has been deduced., Correction in: PHYSICS LETTERS B, Volume: 806, Article Number: 135555, DOI: 10.1016/j.physletb.2020.135555

Published
2017
Full Text
View/download PDF

47. Search for eta-mesic He-4 in the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) reactions with the WASA-at-COSY facility

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, E., Goswami, A., Grigoryev, K., Gullstroem, C. -O, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kelkar, N. G., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magierae, A., Maier, R., Marcinievski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schaetti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, M., Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, E., Goswami, A., Grigoryev, K., Gullstroem, C. -O, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kelkar, N. G., Kemmerling, G., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magierae, A., Maier, R., Marcinievski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schaetti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, M., Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.

Abstract

The search for He-4-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) processes. The deuteron beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the dd -> He-4 eta reaction ranging from Q = 70 MeV to Q = 30 MeV. The luminosity was determined based on the dd -> (3)Hen reaction and the quasi-free proton proton scattering via dd -> ppn(spectator)n(spectator) reactions. The excitation functions, determined independently for the measured reactions, do not reveal a structure which could be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the total cross sections for the bound state production and decay in dd -> (4He-eta)(bound) -> (3)Hen pi(0) and dd -> (He-4-eta)(bound) -> (3)Hep pi(-) processes were determined taking into account the isospin relation between the both of the considered channels. The results of the analysis depend on the assumptions of the N* (1535) momentum distribution in the anticipated mesic-He-4. Assuming, as in the previous works, that this is identical with the distribution of nucleons bound with 20 MeV in He-4, we determined that (for the mesic bound state width in the range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about 3 nb and about 6 nb for n pi(0) and p pi(-) channels, respectively. However, based on the recent theoretical findings of the N*(1535) momentum distribution in the N*-He-3 nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector acceptance decreases and hence the corresponding upper limits are 5 nb and 10 nb for n pi(0) and p pi(-) channels respectively. (C) 2017 Elsevier B.V. All rights reserved.

Published
2017
Full Text
View/download PDF

48. Measurements of branching ratios for eta decays into charged particles

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oskar, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marcinievski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Taeschner, A., Trzcinski, A., Varma, R., Wiedner, U., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zink, A., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Gullström, Carl-Oskar, Heijkenskjöld, Lena, Hejny, V., Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marcinievski, Pawel, Marianski, B., Mikirtychiants, M., Morsch, H. -P, Moskal, P., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Taeschner, A., Trzcinski, A., Varma, R., Wiedner, U., Wolke, Magnus, Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zink, A., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.

Abstract

The WASA-at-COSY experiment has collected 3 x 10(7) events with eta mesons produced via the reaction pd -> He-3 eta at T = 1.0 GeV. Using this data set, we evaluate the branching ratios of the decays eta -> pi(+)pi(-)gamma, eta -> e(+)e(-)gamma, eta -> pi(+)pi(-)e(+)e(-), and eta -> e(+)e(-)e(+)e(-). The branching ratios are normalized to the eta -> pi(+)pi(-) pi(0) decay. In addition an upper limit on a CP-violating asymmetry in eta -> pi(+)pi(-)e(+)e(-) is extracted.

Published
2016
Full Text
View/download PDF

49. Search for an isospin I=3 dibaryon

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buscher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, Kjell E. I., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C. -O, Heijkenskjöld, Lena, Hejny, V., Husken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marcinievski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prasuhnl, D., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopovo, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, Magnus, Wronska, A., Wustner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zink, A., Zlomanczuk, Jozef, Zupranski, P., Zurek, M., Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buscher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Fohl, K., Fransson, Kjell E. I., Goldenbaum, F., Goswami, A., Grigoryev, K., Gullstrom, C. -O, Heijkenskjöld, Lena, Hejny, V., Husken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khatri, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marcinievski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., del Rio, E. Perez, Piskunov, N. M., Prasuhnl, D., Pszczel, Damian, Pysz, K., Pyszniak, Andrzej, Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schatti-Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., Sitterberg, K., Skorodko, T., Skurzok, M., Smyrski, J., Sopovo, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroher, H., Szczurek, A., Trzcinski, A., Varma, R., Wolke, Magnus, Wronska, A., Wustner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zink, A., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.

Abstract

Various theoretical calculations based on QCD or hadronic interactions predict that in addition to the recently observed dibaryon resonance d*(2380) with I(J(P)) = 3(0(+)) there should also exist a dibaryon resonance with mirrored quantum numbers I(J(P)) = 3(0(+)). We report here on a search for such a NN-decoupled state in data on the pp -> pp pi(+) pi(+) pi(-) pi(-) reaction. Since no clear-cut evidence has been found, we give upper limits for the production cross section of such a resonance in the mass range 2280-2500 MeV.

Published
2016
Full Text
View/download PDF

50. Search for an isospin I= 3 dibaryon

Author

Adlarson, P., primary, Augustyniak, W., additional, Bardan, W., additional, Bashkanov, M., additional, Bergmann, F.S., additional, Berłowski, M., additional, Bhatt, H., additional, Bondar, A., additional, Büscher, M., additional, Calén, H., additional, Ciepał, I., additional, Clement, H., additional, Czerwiński, E., additional, Demmich, K., additional, Engels, R., additional, Erven, A., additional, Erven, W., additional, Eyrich, W., additional, Fedorets, P., additional, Föhl, K., additional, Fransson, K., additional, Goldenbaum, F., additional, Goswami, A., additional, Grigoryev, K., additional, Gullström, C.-O., additional, Heijkenskjöld, L., additional, Hejny, V., additional, Hüsken, N., additional, Jarczyk, L., additional, Johansson, T., additional, Kamys, B., additional, Kemmerling, G., additional, Khan, F.A., additional, Khatri, G., additional, Khoukaz, A., additional, Khreptak, O., additional, Kirillov, D.A., additional, Kistryn, S., additional, Kleines, H., additional, Kłos, B., additional, Krzemień, W., additional, Kulessa, P., additional, Kupść, A., additional, Kuzmin, A., additional, Lalwani, K., additional, Lersch, D., additional, Lorentz, B., additional, Magiera, A., additional, Maier, R., additional, Marciniewski, P., additional, Mariański, B., additional, Morsch, H.-P., additional, Moskal, P., additional, Ohm, H., additional, Perez del Rio, E., additional, Piskunov, N.M., additional, Prasuhn, D., additional, Pszczel, D., additional, Pysz, K., additional, Pyszniak, A., additional, Ritman, J., additional, Roy, A., additional, Rudy, Z., additional, Rundel, O., additional, Sawant, S., additional, Schadmand, S., additional, Schätti-Ozerianska, I., additional, Sefzick, T., additional, Serdyuk, V., additional, Shwartz, B., additional, Sitterberg, K., additional, Skorodko, T., additional, Skurzok, M., additional, Smyrski, J., additional, Sopov, V., additional, Stassen, R., additional, Stepaniak, J., additional, Stephan, E., additional, Sterzenbach, G., additional, Stockhorst, H., additional, Ströher, H., additional, Szczurek, A., additional, Trzciński, A., additional, Varma, R., additional, Wolke, M., additional, Wrońska, A., additional, Wüstner, P., additional, Yamamoto, A., additional, Zabierowski, J., additional, Zieliński, M.J., additional, Zink, A., additional, Złomańczuk, J., additional, Żuprański, P., additional, and Żurek, M., additional

Published
2016
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results