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713 results on '"Büscher, M."'

1. A Universal Method to Generate Hyperpolarisation in Beams and Samples

Author

Engels, R., El-Kordy, T., Faatz, N., Hanhart, C., Hanold, N., Kannis, C. S., Kunkel, L., Pütz, S., Sharma, H., Sefzick, T., Soltner, H., Verhoeven, V., Westphal, M., Wirtz, J., and Büscher, M.

Subjects
Physics - Atomic Physics, Physics - Accelerator Physics, Physics - Medical Physics, Quantum Physics
Abstract

Sizable hyperpolarisation, i.e. an imbalance of the occupation numbers of nuclear spins in a sample deviating from thermal equilibrium, is needed in various fields of science. For example, hyperpolarised tracers are utilised in magnetic resonance imaging in medicine (MRI) and polarised beams and targets are employed in nuclear physics to study the spin dependence of nuclear forces. Here we show that the quantum interference of transitions induced by radio-wave pumping with longitudinal and radial pulses are able to produce large polarisations at small magnetic fields. This method is easier than established methods, theoretically understood and experimentally proven for beams of metastable hydrogen atoms in the keV energy range. It should also work for a variety of samples at rest. Thus, this technique opens the door for a new generation of polarised tracers, possibly low-field MRI with better spatial resolution or the production of polarised fuel to increase the efficiency of fusion reactors by manipulating the involved cross sections., Comment: 22 pages, 9 figures, splitted into two parts: main paper and methods

Published
2023

2. Plasma-based particle sources

Author

Fuchs, M, Andonian, G, Apsimon, O, Büscher, M, Downer, MC, Filippetto, D, Lehrach, A, Schroeder, CB, Shadwick, BA, Thomas, AGR, Vafaei-Najafabadi, N, and Xia, G

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Affordable and Clean Energy, Engineering, Nuclear & Particles Physics, Physical sciences
Abstract

Abstract High-brightness particle beams generated by advanced accelerator concepts have the potential to become an essential part of future accelerator technology. In particular, high-gradient accelerators can generate and rapidly accelerate particle beams to relativistic energies. The rapid acceleration and strong confining fields can minimize irreversible detrimental effects to the beam brightness that occur at low beam energies, such as emittance growth or pulse elongation caused by space charge forces. Due to the high accelerating gradients, these novel accelerators are also significantly more compact than conventional technology. Advanced accelerators can be extremely variable and are capable of generating particle beams with vastly different properties using the same driver and setup with only modest changes to the interaction parameters. So far, efforts have mainly been focused on the generation of electron beams, but there are concepts to extend the sources to generate spin-polarized electron beams or positron beams. The beam parameters of these particle sources are largely determined by the injection and subsequent acceleration processes. Although, over the last decade there has been significant progress, the sources are still lacking a sufficiently high 6-dimensional (D) phase-space density that includes small transverse emittance, small energy spread and high charge, and operation at high repetition rate. This is required for future particle colliders with a sufficiently high luminosity or for more near-term applications, such as enabling the operation of free-electron lasers (FELs) in the X-ray regime. Major research and development efforts are required to address these limitations in order to realize these approaches for a front-end injector for a future collider or next-generation light sources. In particular, this includes methods to control and manipulate the phase-space and spin degrees-of-freedom of ultrashort plasma-based electron bunches with high accuracy, and methods that increase efficiency and repetition rate. These efforts also include the development of high-resolution diagnostics, such as full 6D phase-space measurements, beam polarimetry and high-fidelity simulation tools. A further increase in beam luminosity can be achieve through emittance damping. Emittance cooling via the emission of synchrotron radiation using current technology requires kilometer-scale damping rings. For future colliders, the damping rings might be replaced by a substantially more compact plasma-based approach. Here, plasma wigglers with significantly stronger magnetic fields are used instead of permanent-magnet based wigglers to achieve similar damping performance but over a two orders of magnitude reduced length.

Published
2024

3. Snowmass Whitepaper AF6: Plasma-Based Particle Sources

Author

Fuchs, M., Shadwick, B. A., Vafaei-Najafabadi, N., Thomas, A. G. R., Andonian, G., Büscher, M., Lehrach, A., Apsimon, O., Xia, G., Filippetto, D., Schroeder, C. B., and Downer, M. C.

Subjects
Physics - Accelerator Physics, Physics - Plasma Physics
Abstract

High-brightness beams generated by particle sources based on advanced accelerator concepts have the potential to become an essential part of future accelerator technology. High-gradient accelerators can generate and rapidly accelerate particle beams to relativistic energies while minimizing irreversible detrimental effects to the beam brightness that occur at low beam energies. Due to the high accelerating gradients, these novel accelerators are also significantly more compact than conventional technology. The beam parameters of these particle sources are largely determined by the injection and subsequent acceleration processes. While there has been significant progress crucial parameters that are required for a future collider or more near-term applications, including X-ray free-electron lasers (XFELs), such as a sufficiently small energy spread and small emittance for bunches with a high charge and at high pulse repetition rate. Major research and development efforts are required to realize these approaches for a front-end injector for a future collider in order to address these limitations. In particular, this includes methods to control and manipulate the phase-space and spin degrees-of-freedom of ultrashort LWFA electron bunches with high accuracy, methods that increase the laser-to-electron beam efficiency and increased repetition rate. This also includes the development of high-resolution diagnostics, such as full 6D phase-space measurements, beam polarimetry and high-fidelity simulation tools. A further increase in beam luminosity can be achieve through emittance damping. For future colliders, the damping rings might be replaced by a substantially more compact plasma-based approach. Here, plasma wigglers are used to achieve similar damping performance but over a two orders of magnitude reduced length., Comment: contribution to Snowmass 2021

Published
2022

4. A high-density polarized 3He gas-jet target for laser-plasma applications

Author

Fedorets, P., Zheng, C., Engels, R., Engin, I., Feilbach, H., Giesen, U., Glückler, H., Kannis, C., Klehr, F., Lennartz, M., Pfeifer, H., Pfennings, J., Schneider, C. M., Schnitzler, N., Soltner, H., Swaczyna, R., and Büscher, M.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

A laser-driven spin-polarized 3He2+ beam source for nuclear-physics experiments and for the investigation of polarized nuclear fusion demands a high-density polarized 3He gas-jet target. Such a target requires a magnetic system providing a permanent homogeneous holding field for the nuclear spins plus a set of coils for adjusting the orientation of the polarization. Starting from a transport vessel at a maximum pressure of 3 bar, the helium gas is compressed for a short time and can be injected into a laser-interaction chamber through a non-magnetic opening valve and nozzle, thus forming jets with densities of about a few 10^19 cm-3 and widths of about 1 mm. The target comprises a 3D adjustment system for precise positioning of the jet relative to the laser focus. An auxiliary gas system provides remote target operation and flushing of the gas lines with Ar gas, which helps to reduce polarization losses. The design of the target, its operation procedures and first experimental results are presented., Comment: 12 pages, 20 figures, submitted to PRAB

Published
2022

5. Control of electron beam polarization in the bubble regime of laser-wakefield acceleration

Author

Fan, H. C., Liu, X. Y., Li, X. F., Qu, J. F., Yu, Q., Kong, Q., Weng, S. M., Chen, M., Büscher, M., Gibbon, P., Kawata, S., and Sheng, Z. M.

Subjects
Physics - Plasma Physics, Physics - Accelerator Physics
Abstract

Electron beam polarization in the bubble regime of the interaction between a high-intensity laser and a longitudinally pre-polarized plasma is investigated by means of the Thomas-Bargmann-Michel-Telegdi equation. Using a test-particle model, the dependence of the accelerated electron polarization on the bubble geometry is analyzed in detail. Tracking the polarization dynamics of individual electrons reveals that although the spin direction changes during both the self-injection process and acceleration phase, the former has the biggest impact. For nearly spherical bubbles, the polarization of electron beam persists after capture and acceleration in the bubble. By contrast, for aspherical bubble shapes, the electron beam becomes rapidly depolarized, and the net polarization direction can even reverse in the case of a oblate spheroidal bubble. These findings are confirmed via particle-in-cell simulations., Comment: 8pages, 4 figures

Published
2022
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6. Polarized proton acceleration in ultra-intense laser interaction with near critical density plasmas

Author

Li, X. F., Gibbon, P., Hützen, A., Büscher, M., Weng, S. M., Chen, M., and Sheng, Z. M.

Subjects
Physics - Plasma Physics
Abstract

The production of polarized proton beams with multi-GeV energies in ultra-intense laser interaction with targets is studied with three-dimensional Particle-In-Cell simulations. A near-critical density plasma target with pre-polarized proton and tritium ions is considered for the proton acceleration. The pre-polarized protons are initially accelerated by laser radiation pressure before injection and further acceleration in a bubble-like wakefield. The temporal dynamics of proton polarization is tracked via the T-BMT equation, and it is found that the proton polarization state can be altered both by the laser field and the magnetic component of the wakefield. The dependence of the proton acceleration and polarization on the ratio of the ion species is determined, and it is found that the protons can be efficiently accelerated as long as their relative fraction is less than 20%, in which case the bubble size is large enough for the protons to obtain sufficient energy to overcome the bubble injection threshold., Comment: 6 pages, 6 figures

Published
2021
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7. Exploiting the Planck-Einstein Relation

Author

Engels, R., Büscher, M., Buske, P., Gan, Y., Grigoryev, K., Hanhart, Chr., Huxold, L., Kannis, C. S., Lehrach, A., Soltner, H., and Verhoeven, V.

Subjects
Physics - Atomic Physics, Quantum Physics
Abstract

The origin of quantum physics was the discovery of the base unit of electromagnetic action $h$ by Max Planck in 1900 when he analyzed the experimental results of the black body radiation. This permitted Albert Einstein a few years later to explain the photoelectric effect by the absorption of photons with an energy of $E = h \cdot f$. We exploit the Planck-Einstein relation in a new type of fundamental spectroscopic measurements of direct transitions between two states with energy differences of about 10 neV and induced frequencies of a few MHz. Employing a Lamb-shift polarimeter and a Sona transition unit, featuring a relatively simple magnetic field configuration of two opposing solenoidal coils, we were able to determine $f$ and measure $E$ independently. Only resonances corresponding to integer multiples of Planck's constant $h$ were observed in our setup, which can very well be explained quantitatively by the Schr\"odinger equation. This new method beautifully demonstrates the quantization in the micro-cosmos and allows one to measure the hyperfine splitting energies between the substates with $F=1$ and $m_F = -1, 0, +1$ of metastable hydrogen atoms as function of a magnetic field and, thus, to investigate the influence of QED corrections on the Breit-Rabi diagram.

Published
2020

8. Differential Cross Sections for Neutron-Proton Scattering in the Region of the $d^*(2380)$ Dibaryon Resonance

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Büscher, M., Calén, H., Ciepał, I., Clement, H., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. --O., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Hodana, M., Höistad, B., Hüsken, N., Jany, A., Jany, B. R., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krapp, M., Krzemień, W., Kulessa, P., Kupść, 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., Podkopał, P., Prasuhn, D., Pricking, A., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., 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., Wurm, P., Yamamoto, A., Yurev, L., Zabierowski, J., Zink, A., Złomańczuk, J., {Ż}uprański, P., {Ż}urek, M., Workman, R. L., Briscoe, W. J., Strakovsky, I. I., and Švarc, A.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Differential cross sections have been extracted from exclusive and kinematically complete high-statistics measurements of quasifree polarized $\vec{n}p$ scattering performed in the energy region of the $d^*(2380)$ dibaryon resonance covering the the range of beam energies $T_n$ = 0.98 - 1.29 GeV ($\sqrt s$ = 2.32 - 2.44 GeV). The experiment was carried out with the WASA-at-COSY setup having a polarized deuteron beam impinged on the hydrogen pellet target and utilizing the quasifree process $dp \to np + p_{spectator}$. That way the $np$ differential cross section $\sigma(\Theta)$ was measured over a large angular range. The obtained angular distributions complement the corresponding analyzing power $A_y(\Theta)$ measurements published previously. A SAID partial-wave analysis incorporating the new data strengthens the finding of a resonance pole in the coupled $^3D_3 - ^3G_3$ waves.

Published
2020
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9. Production of HD Molecules in Definite Hyperfine Substates

Author

Engels, R., Grigoryev, K., Kannis, C. S., Michael, Y., Ströher, H., Verhoeven, V., Büscher, M., Huxold, L., Kochenda, L., Kravtsov, P., Trofimov, V., Vasilyev, A., and Vznuzdaev, M.

Subjects
Physics - Atomic Physics
Abstract

Polarized atomic beam sources have been in operation since many years to produce either nuclear polarized atomic hydrogen or deuterium beams. In recent experiments such a source was used to polarize both isotopes independently at the same time. By recombination of the atoms, HD molecules with all possible nuclear spin combinations can be created. Those spin isomers are useful for further applications like precision spectroscopy, as polarized targets for laser-particle acceleration, polarized fuel for fusion reactors or as an option for future measurements of electric dipole moments., Comment: to be published in Physical Review Letters

Published
2020
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10. Technical Design Report for the PANDA Endcap Disc DIRC

Author

Panda Collaboration, Davi, F., Erni, W., Krusche, B., Steinacher, M., Walford, N., Liu, H., Liu, Z., Liu, B., Shen, X., Wang, C., Zhao, J., Albrecht, M., Erlen, T., Feldbauer, F., Fink, M., Freudenreich, V., Fritsch, M., Heinsius, F. H., Held, T., Holtmann, T., Keshk, I., Koch, H., Kopf, B., Kuhlmann, M., Kümmel, M., Leiber, S., Musiol, P., Mustafa, A., Pelizäus, M., Pitka, A., Reicherz, G., Richter, M., Schnier, C., Schröder, T., Sersin, S., Sohl, L., Sowa, C., Steinke, M., Triffterer, T., Wiedner, U., Beck, R., Hammann, C., Hartmann, J., Ketzer, B., Kube, M., Rossbach, M., Schmidt, C., Schmitz, R., Thoma, U., Urban, M., Bianconi, A., Bragadireanu, M., Pantea, D., Czyzycki, W., Domagala, M., Filo, G., Jaworowski, J., Krawczyk, M., Lisowski, E., Lisowski, F., Michalek, M., Plazek, J., Korcyl, K., Kozela, A., Kulessa, P., Lebiedowicz, P., Pysz, K., Schäfer, W., Szczurek, A., Fiutowski, T., Idzik, M., Mindur, B., Swientek, K., Biernat, J., Kamys, B., Kistryn, S., Korcyl, G., Krzemien, W., Magiera, A., Moskal, P., Przygoda, W., Rudy, Z., Salabura, P., Smyrski, J., Strzempek, P., Wronska, A., Augustin, I., Böhm, R., Lehmann, I., Marinescu, D. Nicmorus, Schmitt, L., Varentsov, V., Al-Turany, M., Belias, A., Deppe, H., Veis, N. Divani, Dzhygadlo, R., Flemming, H., Gerhardt, A., Götzen, K., Karabowicz, R., Kurilla, U., Lehmann, D., Löchner, S., Lühning, J., Lynen, U., Nakhoul, S., Orth, H., Peters, K., Saito, T., Schepers, G., Schmidt, C. J., Schwarz, C., Schwiening, J., Täschner, A., Traxler, M., Voss, B., Wieczorek, P., Wilms, A., Abazov, V., Alexeev, G., Arefiev, V. A., Astakhov, V., Barabanov, M. Yu., Batyunya, B. V., Dodokhov, V. Kh., Efremov, A., Fechtchenko, A., Galoyan, A., Golovanov, G., Koshurnikov, E. K., Lobanov, Y. Yu., Lobanov, V. I., Malyshev, V., Olshevskiy, A. G., Piskun, A. A., Samartsev, A., Sapozhnikov, M. G., Skachkov, N. B., Skachkova, A. N., Strokovsky, E. A., Tokmenin, V., Uzhinsky, V., Verkheev, A., Vodopianov, A., Zhuravlev, N. I., Zinchenko, A., Branford, D., Glazier, D., Watts, D., Böhm, M., Eyrich, W., Lehmann, A., Miehling, D., Pfaffinger, M., Stelter, S., Uhlig, F., Dobbs, S., Seth, K., Tomaradze, A., Xiao, T., Bettoni, D., Ali, A., Hamdi, A., Krebs, M., Nerling, F., Akishina, V., Gorbunov, S., Kisel, I., Kozlov, G., Pugach, M., Zyzak, M., Bianchi, N., Gianotti, P., Guaraldo, C., Lucherini, V., Bracco, G., Bodenschatz, S., Brinkmann, K. T., Di Pietro, V., Diehl, S., Dormenev, V., Düren, M., Etzelmüller, E., Föhl, K., Galuska, M., Geßler, T., Gutz, E., Hahn, C., Hayrapetyan, A., Kesselkaul, M., Kühn, W., Kuske, T., Lange, J. S., Liang, Y., Metag, V., Moritz, M., Nanova, M., Novotny, R., Quagli, T., Riccardi, A., Rieke, J., Schmidt, M., Schnell, R., Stenzel, H., Strickert, M., Thöring, U., Wasem, T., Wohlfahrt, B., Zaunick, H. G., Tomasi-Gustafsson, E., Ireland, D., Rosner, G., Seitz, B., Deepak, P. N., Kulkarni, A., Apostolou, A., Babai, M., Kavatsyuk, M., Loehner, H., Messchendorp, J., Schakel, P., Tiemens, M., van der Weele, J. C., Vejdani, S., Dutta, K., Kalita, K., Sohlbach, H., Bai, M., Bianchi, L., Büscher, M., Derichs, A., Dosdall, R., Erven, A., Fracassi, V., Gillitzer, A., Goldenbaum, F., Grunwald, D., Jokhovets, L., Kemmerling, G., Kleines, H., Lai, A., Lehrach, A., Mikirtychyants, M., Orfanitski, S., Prasuhn, D., Prencipe, E., Pütz, J., Ritman, J., Rosenthal, E., Schadmand, S., Sefzick, T., Serdyuk, V., Sterzenbach, G., Stockmanns, T., Wintz, P., Wüstner, P., Xu, H., Zhou, Y., Li, Z., Ma, X., Rigato, V., Isaksson, L., Achenbach, P., Aycock, A., Corell, O., Denig, A., Distler, M., Hoek, M., Lauth, W., Merkel, H., Müller, U., Pochodzalla, J., Sanchez, S., Schlimme, S., Sfienti, C., Thiel, M., Zambrana, M., Ahmadi, H., Ahmed, S., Bleser, S., Capozza, L., Cardinali, M., Dbeyssi, A., Ehret, A., Fröhlich, B., Grasemann, P., Haasler, S., Izard, D., Jorge, J., Khaneft, D., Klasen, R., Kliemt, R., Köhler, J., Leithoff, H. H., Lin, D., Maas, F., Maldaner, S., Michel, M., Espi, M. C. Mora, Morales, C. Morales, Motzko, C., Noll, O., Pflüger, S., Pineiro, D. Rodriguez, Steinen, M., Walaa, E., Wolff, S., Zimmermann, I., Fedorov, A., Korzhik, M., Missevitch, O., Balanutsa, P., Chernetsky, V., Demekhin, A., Dolgolenko, A., Fedorets, P., Gerasimov, A., Goryachev, V., Kirin, D. Y., Matveev, V. A., Stavinskiy, A. V., Balashoff, A., Boukharov, A., Malyshev, O., Marishev, I., Chandratre, V., Datar, V., Jha, V., Kumawat, H., Mohanty, A. K., Parmar, A., Rai, A. K., Roy, B., Sonika, G., Fritzsch, C., Grieser, S., Hergemöller, A. K., Hetz, B., Hüsken, N., Khoukaz, A., Wessels, J. P., Herold, C., Khosonthongkee, K., Kobdaj, C., Limphirat, A., Srisawad, P., Yan, Y., Blinov, A. E., Kononov, S., Kravchenko, E. A., Antokhin, E., Barnyakov, M., Barnyakov, A. Yu., Beloborodov, K., Blinov, V. E., Bobrovnikov, V. S., Kuyanov, I. A., Onuchin, A. P., Pivovarov, S., Pyata, E., Serednyakov, S., Tikhonov, Y., Kunne, R., Marchand, D., Ramstein, B., van de Wiele, J., Wang, Y., Boca, G., Burian, V., Finger, M., Nikolovova, A., Pesek, M., Peskova, M., Pfeffer, M., Prochazka, I., Slunecka, M., Gallus, P., Jary, V., Novy, J., Tomasek, M., Virius, M., Vrba, V., Abramov, V., Belikov, N., Bukreeva, S., Davidenko, A., Derevschikov, A., Goncharenko, Y., Grishin, V., Kachanov, V., Kormilitsin, V., Levin, A., Melnik, Y., Minaev, N., Mochalov, V., Morozov, D., Nogach, L., Poslavskiy, S., Ryazantsev, A., Ryzhikov, S., Semenov, P., Shein, I., Uzunian, A., Vasiliev, A., Yakutin, A., Roy, U., Yabsley, B., Belostotski, S., Gavrilov, G., Izotov, A., Manaenkov, S., Miklukho, O., Veretennikov, D., Zhdanov, A., Bäck, T., Cederwall, B., Makonyi, K., Preston, M., Tegner, P. E., Wölbing, D., Godre, S., Bussa, M. P., Marcello, S., Spataro, S., Iazzi, F., Introzzi, R., Lavagno, A., Calvo, D., De Remigis, P., Filippi, A., Mazza, G., Rivetti, A., Wheadon, R., Martin, A., Calen, H., Andersson, W. Ikegami, Johansson, T., Kupsc, A., Marciniewski, P., Papenbrock, M., Pettersson, J., Regina, J., Schönning, K., Wolke, M., Diaz, J., Chackara, V. Pothodi, Chlopik, A., Kesik, G., Melnychuk, D., Slowinski, B., Trzcinski, A., Wojciechowski, M., Wronka, S., Zwieglinski, B., Bühler, P., Marton, J., Steinschaden, D., Suzuki, K., Widmann, E., Zimmermann, S., and Zmeskal, J.

Subjects
Physics - Instrumentation and Detectors
Abstract

PANDA (anti-Proton ANnihiliation at DArmstadt) is planned to be one of the four main experiments at the future international accelerator complex FAIR (Facility for Antiproton and Ion Research) in Darmstadt, Germany. It is going to address fundamental questions of hadron physics and quantum chromodynamics using cooled antiproton beams with a high intensity and and momenta between 1.5 and 15 GeV/c. PANDA is designed to reach a maximum luminosity of 2x10^32 cm^2 s. Most of the physics programs require an excellent particle identification (PID). The PID of hadronic states at the forward endcap of the target spectrometer will be done by a fast and compact Cherenkov detector that uses the detection of internally reflected Cherenkov light (DIRC) principle. It is designed to cover the polar angle range from 5{\deg} to 22{\deg} and to provide a separation power for the separation of charged pions and kaons up to 3 standard deviations (s.d.) for particle momenta up to 4 GeV/c in order to cover the important particle phase space. This document describes the technical design and the expected performance of the novel PANDA Disc DIRC detector that has not been used in any other high energy physics experiment (HEP) before. The performance has been studied with Monte-Carlo simulations and various beam tests at DESY and CERN. The final design meets all PANDA requirements and guarantees suffcient safety margins., Comment: TDR for Panda/Fair to be published

Published
2019

11. Search for eta mesic 3He with the WASA-at-COSY facility in the pd-> 3He 2gamma and pd-> 3He 6gamma reactions

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S. D., Berłowski, M., Bondar, A., Büscher, M., Calén, H., Ciepał, I., Clement, H., Czerwiński, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goswami, A., Grigoryev, K., Heijkenskjöld, L., Hejny, V., Hirenzaki, S., Jarczyk, L., Johansson, T., Kamys, B., Kelkar, N. G., Kemmerling, G., Khreptak, A., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, 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., Ritman, J., Roy, A., Rundel, O., Sawant, S., Schadmand, S., Schätti--Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., 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

We report on the experimental search for the bound state of an $\eta$ meson and $^{3}\hspace{-0.03cm}\mbox{He}$ nucleus performed using the WASA-at-COSY detector setup. In order to search for the $\eta$-mesic nucleus decay, the $pd\rightarrow$ $^{3}\hspace{-0.03cm}\mbox{He} 2\gamma$ and $pd\rightarrow$ $^{3}\hspace{-0.03cm}\mbox{He} 6\gamma$ channels have been analysed. These reactions manifest the direct decay of $\eta$ meson bound in $^{3}\hspace{-0.03cm}\mbox{He}$ nucleus. This non-mesonic decay channel has been considered for the first time. When taking into account only statistical errors, the obtained excitation functions reveal a slight indication for a possible bound state signal corresponding to an $^3$He-$\eta$ nucleus width $\Gamma$ above 20 MeV and binding energy $B_s$ between 0 and 15 MeV. However, the determined cross sections are consistent with zero in the range of the systematic uncertainty. Therefore, as final result we estimate only the upper limit for the cross section of the $\eta$-mesic $^{3}\hspace{-0.03cm}\mbox{He}$ nucleus formation followed by the $\eta$ meson decay which varies between $2$ nb and $15$ nb depending on possible bound state parameters., Comment: Article accepted to be published in PLB

Published
2019
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13. Nm-sized cryogenic hydrogen clusters for a laser-driven proton source

Author

Grieser, S., Aurand, B., Aktan, E., Bonaventura, D., Büscher, M., Cerchez, M., Engin, I., Leßmann, L., Mannweiler, C., Prasad, R., Willi, O., and Khoukaz, A.

Subjects
Physics - Plasma Physics
Abstract

A continuous cryogenic hydrogen cluster-jet target has been developed for laser-plasma interaction studies, in particular as a source for the acceleration of protons. Major advantages of the cluster-jet target are the compatibility with pulsed high repetition lasers and the absence of debris. The cluster-jet target was characterized using the Mie-scattering technique allowing to determine the cluster size and to compare it with an empirical prediction. In addition, an estimation of the cluster beam density was performed. The system was implemented at the high power laser system ARCTURUS and first successful measurements show the acceleration of protons after irradiation by high intensity laser pulses with a repetition rate of five Hertz., Comment: 9 pages, 7 figures

Published
2018
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14. 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
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15. On the Production of an Isotensor Dibaryon in the $pp \to pp\pi^+\pi^-$ Reaction

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., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., 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., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti--Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., 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., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Exclusive measurements of the quasi-free $pp \to pp\pi^+\pi^-$ reaction 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 $T_p = 1.08 - 1.36$ GeV ($\sqrt s$ = 2.35 - 2.46 GeV), which includes the regions of $N^*(1440)$ and $\Delta(1232)\Delta(1232)$ resonance excitations. Calculations describing these excitations by $t$-channel meson exchange are at variance with experimental differential cross sections and underpredict substantially the measured total cross section. An isotensor $\Delta N$ dibaryon resonance with $I(J^P) = 2(1^+)$ produced associatedly with a pion is able to overcome these deficiencies. Such a dibaryon was predicted by Dyson and Xuong and more recently calculated by Gal and Garcilazo.

Published
2018
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16. An Isotensor Dibaryon in the $pp \to pp\pi^+\pi^-$ Reaction?

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., Heijkenskjöld, L., Hejny, V., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khoukaz, A., Khreptak, O., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krzemień, W., Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., 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., Ritman, J., Roy, A., Rudy, Z., Rundel, O., Sawant, S., Schadmand, S., Schätti--Ozerianska, I., Sefzick, T., Serdyuk, V., Shwartz, B., 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., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Exclusive measurements of the quasi-free $pp \to pp\pi^+\pi^-$ reaction have been carried out at WASA@COSY by means of $pd$ collisions at $T_p$ = 1.2 GeV. Total and differential cross sections have been extracted covering the energy region $T_p = 1.08 - 1.36$ GeV, which is the region of $N^*(1440)$ and $\Delta(1232)\Delta(1232)$ resonance excitations. Calculations describing these excitations by $t$-channel meson exchange are at variance with the measured differential cross sections and underpredict substantially the experimental total cross section. An isotensor $\Delta N$ dibaryon resonance with $I(J^P) = 2(1^+)$ produced associatedly with a pion is able to overcome these deficiencies., Comment: arXiv admin note: substantial text overlap with arXiv:1803.03192

Published
2018
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17. 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
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18. 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
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19. 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
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20. 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

21. 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
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22. Feasibility study for the measurement of $\pi N$ TDAs at PANDA in $\bar{p}p\to J/\psi\pi^0$

Author

PANDA Collaboration, Singh, B., Erni, W., Krusche, B., Steinacher, M., Walford, N., Liu, H., Liu, Z., Liu, B., Shen, X., Wang, C., Zhao, J., Albrecht, M., Erlen, T., Fink, M., Heinsius, F. H., Held, T., Holtmann, T., Jasper, S., Keshk, I., Koch, H., Kopf, B., Kuhlmann, M., Kümmel, M., Leiber, S., Mikirtychyants, M., Musiol, P., Mustafa, A., Pelizäus, M., Pychy, J., Richter, M., Schnier, C., Schröder, T., Sowa, C., Steinke, M., Triffterer, T., Wiedner, U., Ball, M., Beck, R., Hammann, C., Ketzer, B., Kube, M., Mahlberg, P., Rossbach, M., Schmidt, C., Schmitz, R., Thoma, U., Urban, M., Walther, D., Wendel, C., Wilson, A., Bianconi, A., Bragadireanu, M., Caprini, M., Pantea, D., Patel, B., Czyzycki, W., Domagala, M., Filo, G., Jaworowski, J., Krawczyk, M., Lisowski, E., Lisowski, F., Michałek, M., Poznański, P., Płażek, J., Korcyl, K., Kozela, A., Kulessa, P., Lebiedowicz, P., Pysz, K., Schäfer, W., Szczurek, A., Fiutowski, T., Idzik, M., Mindur, B., Przyborowski, D., Swientek, K., Biernat, J., Kamys, B., Kistryn, S., Korcyl, G., Krzemien, W., Magiera, A., Moskal, P., Pyszniak, A., Rudy, Z., Salabura, P., Smyrski, J., Strzempek, P., Wronska, A., Augustin, I., Böhm, R., Lehmann, I., Marinescu, D. Nicmorus, Schmitt, L., Varentsov, V., Al-Turany, M., Belias, A., Deppe, H., Veis, N. Divani, Dzhygadlo, R., Ehret, A., Flemming, H., Gerhardt, A., Götzen, K., Gromliuk, A., Gruber, L., Karabowicz, R., Kliemt, R., Krebs, M., Kurilla, U., Lehmann, D., Löchner, S., Lühning, J., Lynen, U., Orth, H., Patsyuk, M., Peters, K., Saito, T., Schepers, G., Schmidt, C. J., Schwarz, C., Schwiening, J., Täschner, A., Traxler, M., Ugur, C., Voss, B., Wieczorek, P., Wilms, A., Zühlsdorf, M., Abazov, V., Alexeev, G., Arefiev, V. A., Astakhov, V., Barabanov, M. Yu., Batyunya, B. V., Davydov, Y., Dodokhov, V. Kh., Efremov, A., Fechtchenko, A., Fedunov, A. G., Galoyan, A., Grigoryan, S., Koshurnikov, E. K., Lobanov, Y. Yu., Lobanov, V. I., Makarov, A. F., Malinina, L. V., Malyshev, V., Olshevskiy, A. G., Perevalova, E., Piskun, A. A., Pocheptsov, T., Pontecorvo, G., Rodionov, V., Rogov, Y., Salmin, R., Samartsev, A., Sapozhnikov, M. G., Shabratova, G., Skachkov, N. B., Skachkova, A. N., Strokovsky, E. A., Suleimanov, M., Teshev, R., Tokmenin, V., Uzhinsky, V., Vodopianov, A., Zaporozhets, S. A., Zhuravlev, N. I., Zinchenko, A., Zorin, A. G., Branford, D., Glazier, D., Watts, D., Böhm, M., Britting, A., Eyrich, W., Lehmann, A., Pfaffinger, M., Uhlig, F., Dobbs, S., Seth, K., Tomaradze, A., Xiao, T., Bettoni, D., Carassiti, V., Ramusino, A. Cotta, Dalpiaz, P., Drago, A., Fioravanti, E., Garzia, I., Savrie, M., Akishina, V., Kisel, I., Kozlov, G., Pugach, M., Zyzak, M., Gianotti, P., Guaraldo, C., Lucherini, V., Bersani, A., Bracco, G., Macri, M., Parodi, R. F., Biguenko, K., Brinkmann, K. T., Di Pietro, V., Diehl, S., Dormenev, V., Drexler, P., Düren, M., Etzelmüller, E., Galuska, M., Gutz, E., Hahn, C., Hayrapetyan, A., Kesselkaul, M., Kühn, W., Kuske, T., Lange, J. S., Liang, Y., Metag, V., Moritz, M., Nanova, M., Nazarenko, S., Novotny, R., Quagli, T., Reiter, S., Riccardi, A., Rieke, J., Rosenbaum, C., Schmidt, M., Schnell, R., Stenzel, H., Thöring, U., Ullrich, T., Wagner, M. N., Wasem, T., Wohlfahrt, B., Zaunick, H. G., Tomasi-Gustafsson, E., Ireland, D., Rosner, G., Seitz, B., Deepak, P. N., Kulkarni, A., Apostolou, A., Babai, M., Kavatsyuk, M., Lemmens, P. J., Lindemulder, M., Loehner, H., Messchendorp, J., Schakel, P., Smit, H., Tiemens, M., van der Weele, J. C., Veenstra, R., Vejdani, S., Dutta, K., Kalita, K., Kumar, A., Roy, A., Sohlbach, H., Bai, M., Bianchi, L., Büscher, M., Cao, L., Cebulla, A., Dosdall, R., Gillitzer, A., Goldenbaum, F., Grunwald, D., Herten, A., Hu, Q., Kemmerling, G., Kleines, H., Lai, A., Lehrach, A., Nellen, R., Ohm, H., Orfanitski, S., Prasuhn, D., Prencipe, E., Pütz, J., Ritman, J., Schadmand, S., Sefzick, T., Serdyuk, V., Sterzenbach, G., Stockmanns, T., Wintz, P., Wüstner, P., Xu, H., Zambanini, A., Li, S., Li, Z., Sun, Z., Rigato, V., Isaksson, L., Achenbach, P., Corell, O., Denig, A., Distler, M., Hoek, M., Karavdina, A., Lauth, W., Merkel, H., Müller, U., Pochodzalla, J., Sanchez, S., Schlimme, S., Sfienti, C., Thiel, M., Ahmadi, H., Ahmed, S., Bleser, S., Capozza, L., Cardinali, M., Dbeyssi, A., Deiseroth, M., Feldbauer, F., Fritsch, M., Fröhlich, B., Kang, D., Khaneft, D., Klasen, R., Leithoff, H. H., Lin, D., Maas, F., Maldaner, S., Martínez, M., Michel, M., Espí, M. C. Mora, Morales, C. Morales, Motzko, C., Nerling, F., Noll, O., Pflüger, S., Pitka, A., Piñeiro, D. Rodríguez, Sanchez-Lorente, A., Steinen, M., Valente, R., Weber, T., Zambrana, M., Zimmermann, I., Fedorov, A., Korjik, M., Missevitch, O., Boukharov, A., Malyshev, O., Marishev, I., Balanutsa, V., Balanutsa, P., Chernetsky, V., Demekhin, A., Dolgolenko, A., Fedorets, P., Gerasimov, A., Goryachev, V., Chandratre, V., Datar, V., Dutta, D., Jha, V., Kumawat, H., Mohanty, A. K., Parmar, A., Roy, B., Sonika, G., Fritzsch, C., Grieser, S., Hergemöller, A. K., Hetz, B., Hüsken, N., Khoukaz, A., Wessels, J. P., Khosonthongkee, K., Kobdaj, C., Limphirat, A., Srisawad, P., Yan, Y., Barnyakov, A. Yu., Barnyakov, M., Beloborodov, K., Blinov, V. E., Bobrovnikov, V. S., Kuyanov, I. A., Martin, K., Onuchin, A. P., Serednyakov, S., Sokolov, A., Tikhonov, Y., Blinov, A. E., Kononov, S., Kravchenko, E. A., Atomssa, E., Kunne, R., Ma, B., Marchand, D., Ramstein, B., van de Wiele, J., Wang, Y., Boca, G., Costanza, S., Genova, P., Montagna, P., Rotondi, A., Abramov, V., Belikov, N., Bukreeva, S., Davidenko, A., Derevschikov, A., Goncharenko, Y., Grishin, V., Kachanov, V., Kormilitsin, V., Levin, A., Melnik, Y., Minaev, N., Mochalov, V., Morozov, D., Nogach, L., Poslavskiy, S., Ryazantsev, A., Ryzhikov, S., Semenov, P., Shein, I., Uzunian, A., Vasiliev, A., Yakutin, A., Roy, U., Yabsley, B., Belostotski, S., Gavrilov, G., Izotov, A., Manaenkov, S., Miklukho, O., Veretennikov, D., Zhdanov, A., Bäck, T., Cederwall, B., Makonyi, K., Preston, M., Tegner, P. E., Wölbing, D., Rai, A. K., Godre, S., Calvo, D., Coli, S., De Remigis, P., Filippi, A., Giraudo, G., Lusso, S., Mazza, G., Mignone, M., Rivetti, A., Wheadon, R., Amoroso, A., Bussa, M. P., Busso, L., De Mori, F., Destefanis, M., Fava, L., Ferrero, L., Greco, M., Hu, J., Lavezzi, L., Maggiora, M., Maniscalco, G., Marcello, S., Sosio, S., Spataro, S., Balestra, F., Iazzi, F., Introzzi, R., Lavagno, A., Olave, J., Birsa, R., Bradamante, F., Bressan, A., Martin, A., Calen, H., Andersson, W. Ikegami, Johansson, T., Kupsc, A., Marciniewski, P., Papenbrock, M., Pettersson, J., Schönning, K., Wolke, M., Galnander, B., Diaz, J., Chackara, V. Pothodi, Chlopik, A., Kesik, G., Melnychuk, D., Slowinski, B., Trzcinski, A., Wojciechowski, M., Wronka, S., Zwieglinski, B., Bühler, P., Marton, J., Steinschaden, D., Suzuki, K., Widmann, E., Zmeskal, J., and Semenov-Tian-Shansky, K. M.

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

The exclusive charmonium production process in $\bar{p}p$ annihilation with an associated $\pi^0$ meson $\bar{p}p\to J/\psi\pi^0$ is studied in the framework of QCD collinear factorization. The feasibility of measuring this reaction through the $J/\psi\to e^+e^-$ decay channel with the PANDA (AntiProton ANnihilation at DArmstadt) experiment is investigated. Simulations on signal reconstruction efficiency as well as the background rejection from various sources including the $\bar{p}p\to\pi^+\pi^-\pi^0$ and $\bar{p}p\to J/\psi\pi^0\pi^0$ reactions are performed with PandaRoot, the simulation and analysis software framework of the PANDA experiment. It is shown that the measurement can be done at PANDA with significant constraining power under the assumption of an integrated luminosity attainable in four to five months of data taking at the maximum design luminosity., Comment: 25 pages, 22 figures

Published
2016
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23. 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
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24. Feasibility studies of time-like proton electromagnetic form factors at PANDA at FAIR

Author

PANDA Collaboration, Singh, B., Erni, W., Krusche, B., Steinacher, M., Walford, N., Liu, B., Liu, H., Liu, Z., Shen, X., Wang, C., Zhao, J., Albrecht, M., Erlen, T., Fink, M., Heinsius, F., Held, T., Holtmann, T., Jasper, S., Keshk, I., Koch, H., Kopf, B., Kuhlmann, M., Kümmel, M., Leiber, S., Mikirtychyants, M., Musiol, P., Mustafa, A., Pelizäus, M., Pychy, J., Richter, M., Schnier, C., Schröder, T., Sowa, C., Steinke, M., Triffterer, T., Wiedner, U., Ball, M., Beck, R., Hammann, C., Ketzer, B., Kube, M., Mahlberg, P., Rossbach, M., Schmidt, C., Schmitz, R., Thoma, U., Urban, M., Walther, D., Wendel, C., Wilson, A., Bianconi, A., Bragadireanu, M., Caprini, M., Pantea, D., Patel, B., Czyzycki, W., Domagala, M., Filo, G., Jaworowski, J., Krawczyk, M., Lisowski, F., Lisowski, E., Michałek, M., Poznański, P., Płażek, J., Korcyl, K., Kozela, A., Kulessa, P., Lebiedowicz, P., Pysz, K., Schäfer, W., Szczurek, A., Fiutowski, T., Idzik, M., Mindur, B., Przyborowski, D., Swientek, K., Biernat, J., Kamys, B., Kistryn, S., Korcyl, G., Krzemien, W., Magiera, A., Moskal, P., Pyszniak, A., Rudy, Z., Salabura, P., Smyrski, J., Strzempek, P., Wronska, A., Augustin, I., Böhm, R., Lehmann, I., Marinescu, D. Nicmorus, Schmitt, L., Varentsov, V., Al-Turany, M., Belias, A., Deppe, H., Dzhygadlo, R., Ehret, A., Flemming, H., Gerhardt, A., Götzen, K., Gromliuk, A., Gruber, L., Karabowicz, R., Kliemt, R., Krebs, M., Kurilla, U., Lehmann, D., Löchner, S., Lühning, J., Lynen, U., Orth, H., Patsyuk, M., Peters, K., Saito, T., Schepers, G., Schmidt, C. J., Schwarz, C., Schwiening, J., Täschner, A., Traxler, M., Ugur, C., Voss, B., Wieczorek, P., Wilms, A., Zühlsdorf, M., Abazov, V., Alexeev, G., Arefiev, V. A., Astakhov, V., Barabanov, M. Yu., Batyunya, B. V., Davydov, Y., Dodokhov, V. Kh., Efremov, A., Fechtchenko, A., Fedunov, A. G., Galoyan, A., Grigoryan, S., Koshurnikov, E. K., Lobanov, Y. Yu., Lobanov, V. I., Makarov, A. F., Malinina, L. V., Malyshev, V., Olshevskiy, A. G., Perevalova, E., Piskun, A. A., Pocheptsov, T., Pontecorvo, G., Rodionov, V., Rogov, Y., Salmin, R., Samartsev, A., Sapozhnikov, M. G., Shabratova, G., Skachkov, N. B., Skachkova, A. N., Strokovsky, E. A., Suleimanov, M., Teshev, R., Tokmenin, V., Uzhinsky, V., Vodopianov, A., Zaporozhets, S. A., Zhuravlev, N. I., Zorin, A. G., Branford, D., Glazier, D., Watts, D., Böhm, M., Britting, A., Eyrich, W., Lehmann, A., Pfaffinger, M., Uhlig, F., Dobbs, S., Seth, K., Tomaradze, A., Xiao, T., Bettoni, D., Carassiti, V., Ramusino, A. Cotta, Dalpiaz, P., Drago, A., Fioravanti, E., Garzia, I., Savrie, M., Akishina, V., Kisel, I., Kozlov, G., Pugach, M., Zyzak, M., Gianotti, P., Guaraldo, C., Lucherini, V., Bersani, A., Bracco, G., Macri, M., Parodi, R. F., Biguenko, K., Brinkmann, K., Di Pietro, V., Diehl, S., Dormenev, V., Drexler, P., Düren, M., Etzelmüller, E., Galuska, M., Gutz, E., Hahn, C., Hayrapetyan, A., Kesselkaul, M., Kühn, W., Kuske, T., Lange, J. S., Liang, Y., Metag, V., Nanova, M., Nazarenko, S., Novotny, R., Quagli, T., Reiter, S., Rieke, J., Rosenbaum, C., Schmidt, M., Schnell, R., Stenzel, H., Thöring, U., Ullrich, M., Wagner, M. N., Wasem, T., Wohlfahrt, B., Zaunick, H., Ireland, D., Rosner, G., Seitz, B., Deepak, P. N., Kulkarni, A., Apostolou, A., Babai, M., Kavatsyuk, M., Lemmens, P. J., Lindemulder, M., Loehner, H., Messchendorp, J., Schakel, P., Smit, H., Tiemens, M., van der Weele, J. C., Veenstra, R., Vejdani, S., Dutta, K., Kalita, K., Kumar, A., Roy, A., Sohlbach, H., Bai, M., Bianchi, L., Büscher, M., Cao, L., Cebulla, A., Dosdall, R., Gillitzer, A., Goldenbaum, F., Grunwald, D., Herten, A., Hu, Q., Kemmerling, G., Kleines, H., Lehrach, A., Nellen, R., Ohm, H., Orfanitski, S., Prasuhn, D., Prencipe, E., Pütz, J., Ritman, J., Schadmand, S., Sefzick, T., Serdyuk, V., Sterzenbach, G., Stockmanns, T., Wintz, P., Wüstner, P., Xu, H., Zambanini, A., Li, S., Li, Z., Sun, Z., Rigato, V., Isaksson, L., Achenbach, P., Corell, O., Denig, A., Distler, M., Hoek, M., Karavdina, A., Lauth, W., Merkel, H., Müller, U., Pochodzalla, J., Sanchez, S., Schlimme, S., Sfienti, C., Thiel, M., Ahmadi, H., Ahmed, S., Bleser, S., Capozza, L., Cardinali, M., Dbeyssi, A., Deiseroth, M., Feldbauer, F., Fritsch, M., Fröhlich, B., Jasinski, P., Kang, D., Khaneft, D., Klasen, R., Leithoff, H. H., Lin, D., Maas, F., Maldaner, S., Marta, M., Michel, M., Espí, M. C. Mora, Morales, C. Morales, Motzko, C., Nerling, F., Noll, O., Pflüger, S., Pitka, A., Piñeiro, D. Rodríguez, Sanchez-Lorente, A., Steinen, M., Valente, R., Weber, T., Zambrana, M., Zimmermann, I., Fedorov, A., Korjik, M., Missevitch, O., Boukharov, A., Malyshev, O., Marishev, I., Balanutsa, V., Balanutsa, P., Chernetsky, V., Demekhin, A., Dolgolenko, A., Fedorets, P., Gerasimov, A., Goryachev, V., Chandratre, V., Datar, V., Dutta, D., Jha, V., Kumawat, H., Mohanty, A. K., Parmar, A., Roy, B., Sonika, G., Fritzsch, C., Grieser, S., Hergemöller, A., Hetz, B., Hüsken, N., Khoukaz, A., Wessels, J. P., Khosonthongkee, K., Kobdaj, C., Limphirat, A., Srisawad, P., Yan, Y., Barnyakov, M., Barnyakov, A. Yu., Beloborodov, K., Blinov, A. E., Blinov, V. E., Bobrovnikov, V. S., Kononov, S., Kravchenko, E. A., Kuyanov, I. A., Martin, K., Onuchin, A. P., Serednyakov, S., Sokolov, A., Tikhonov, Y., Atomssa, E., Kunne, R., Marchand, D., Ramstein, B., van de Wiele, J., Wang, Y., Boca, G., Costanza, S., Genova, P., Montagna, P., Rotondi, A., Abramov, V., Belikov, N., Bukreeva, S., Davidenko, A., Derevschikov, A., Goncharenko, Y., Grishin, V., Kachanov, V., Kormilitsin, V., Levin, A., Melnik, Y., Minaev, N., Mochalov, V., Morozov, D., Nogach, L., Poslavskiy, S., Ryazantsev, A., Ryzhikov, S., Semenov, P., Shein, I., Uzunian, A., Vasiliev, A., Yakutin, A., Tomasi-Gustafsson, E., Roy, U., Yabsley, B., Belostotski, S., Gavrilov, G., Izotov, A., Manaenkov, S., Miklukho, O., Veretennikov, D., Zhdanov, A., Makonyi, K., Preston, M., Tegner, P., Wölbing, D., Bäck, T., Cederwall, B., Rai, A. K., Godre, S., Calvo, D., Coli, S., De Remigis, P., Filippi, A., Giraudo, G., Lusso, S., Mazza, G., Mignone, M., Rivetti, A., Wheadon, R., Balestra, F., Iazzi, F., Introzzi, R., Lavagno, A., Olave, J., Amoroso, A., Bussa, M. P., Busso, L., De Mori, F., Destefanis, M., Fava, L., Ferrero, L., Greco, M., Hu, J., Lavezzi, L., Maggiora, M., Maniscalco, G., Marcello, S., Sosio, S., Spataro, S., Birsa, R., Bradamante, F., Bressan, A., Martin, A., Calen, H., Andersson, W. Ikegami, Johansson, T., Kupsc, A., Marciniewski, P., Papenbrock, M., Pettersson, J., Schönning, K., Wolke, M., Galnander, B., Diaz, J., Chackara, V. Pothodi, Chlopik, A., Kesik, G., Melnychuk, D., Slowinski, B., Trzcinski, A., Wojciechowski, M., Wronka, S., Zwieglinski, B., Bühler, P., Marton, J., Steinschaden, D., Suzuki, K., Widmann, E., and Zmeskal, J.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Simulation results for future measurements of electromagnetic proton form factors at \PANDA (FAIR) within the PandaRoot software framework are reported. The statistical precision with which the proton form factors can be determined is estimated. The signal channel $\bar p p \to e^+ e^-$ is studied on the basis of two different but consistent procedures. The suppression of the main background channel, $\textit{i.e.}$ $\bar p p \to \pi^+ \pi^-$, is studied. Furthermore, the background versus signal efficiency, statistical and systematical uncertainties on the extracted proton form factors are evaluated using two different procedures. The results are consistent with those of a previous simulation study using an older, simplified framework. However, a slightly better precision is achieved in the PandaRoot study in a large range of momentum transfer, assuming the nominal beam conditions and detector performance.

Published
2016

25. 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
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26. 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
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27. Kaon pair production in proton-nucleus collisions at 2.83 GeV kinetic energy

Author

Kiselev, Yu. T., Hartmann, M., Polyanskiy, A., Paryev, E. Ya., Barsov, S., Buescher, M., Dymov, S., Gebel, R., Hejny, V., Kacharava, A., Keshelashvili, I., Lorentz, B., Maeda, Y., Merzliakov, S., Mikirtytchiants, S., Ohm, H., Serdyuk, V., Sibirtsev, A., Sinitsyna, V. Y., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Yu., Wilkin, C., Wuestner, P., and Ye, Q. J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The production of non-phi K+K- pairs by protons of 2.83 GeV kinetic energy on C, Cu, Ag, and Au targets has been investigated using the COSY-ANKE magnetic spectrometer. The K- momentum dependence of the differential cross section has been measured at small angles over the 0.2--0.9 GeV/c range. The comparison of the data with detailed model calculations indicates an attractive K- -nucleus potential of about -60 MeV at normal nuclear matter density at a mean momentum of 0.5 GeV/c. However, this approach has difficulty in reproducing the smallness of the observed cross sections at low K- momenta., Comment: 7 pages, 5 figures, 1 table

Published
2015
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28. Measurement of the $np \to np\pi^0\pi^0$ Reaction in Search for the Recently Observed $d^*(2380)$ Resonance

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., Doroshkevich, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. --O., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Höistad, B., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., 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., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., Shwartz, B., 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., Wagner, G. J., 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

Exclusive measurements of the quasi-free $np \to np\pi^0\pi^0$ reaction have been performed by means of $dp$ collisions at $T_d$ = 2.27 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region $\sqrt s$ = (2.35 - 2.46) GeV, which includes the region of the ABC effect and its associated $d^*(2380)$ resonance. Adding the $d^*$ resonance amplitude to that for the conventional processes leads to a reasonable description of the data. The observed resonance effect in the total cross section is in agreement with the predictions of F\"aldt and Wilkin as well Albadajedo and Oset. The ABC effect, {\it i.e.} the low-mass enhancement in the $\pi^0\pi^0$-invariant mass spectrum, is found to be very modest - if present at all, which might pose a problem to some of its interpretations.

Published
2014
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29. Experimental access to Transition Distribution Amplitudes with the \={P}ANDA experiment at FAIR

Author

PANDA Collaboration, Singh, B. P., Erni, W., Keshelashvili, I., Krusche, B., M. Steinacher, Liu, B., Liu, H., Liu, Z., Shen, X., Wang, C., J. Zhao, Albrecht, M., Fink, M., Heinsius, F. H., Held, T., Holtmann, T., Koch, H., Kopf, B., Kümmel, M., Kuhl, G., Kuhlmann, M., Leyhe, M., Mikirtychyants, M., Musiol, P., Mustafa, A., Pelizäus, M., Pychy, J., Richter, M., Schnier, C., Schröder, T., Sowa, C., Steinke, M., Triffterer, T., Wiedner, U., Beck, R., Hammann, C., Kaiser, D., Ketzer, B., Kube, M., Mahlberg, P., Rossbach, M., Schmidt, C., Schmitz, R., Thoma, U., Walther, D., Wendel, C., Wilson, A., Bianconi, A., Bragadireanu, M., Caprini, M., Pantea, D., Pietreanu, D., Vasile, M. E., Patel, B., Kaplan, D., Brandys, P., Czyzewski, T., Czyzycki, W., Domagala, M., Hawryluk, M., Filo, G., Krawczyk, M., Kwiatkowski, D., Lisowski, E., Lisowski, F., Fiutowski, T., Idzik, M., Mindur, B., Przyborowski, D., Swientek, K., Czech, B., Kliczewski, S., Korcyl, K., Kozela, A., Kulessa, P., Lebiedowicz, P., Malgorzata, K., Pysz, K., Schäfer, W., Siudak, R., Szczurek, A., Biernat, J., Jowzaee, S., Kamys, B., Kistryn, S., Korcyl, G., Krzemien, W., Magiera, A., Moskal, P., Palka, M., Psyzniak, A., Rudy, Z., Salabura, P., Smyrski, J., Strzempek, P., Wrońska, A., Augustin, I., Lehmann, I., Nicmorus, D., Schepers, G., Schmitt, L., Al-Turany, M., Cahit, U., Capozza, L., Dbeyssi, A., Deppe, H., Dzhygadlo, R., Ehret, A., Flemming, H., Gerhardt, A., Götzen, K., Karabowicz, R., Kliemt, R., Kunkel, J., Kurilla, U., Lehmann, D., Lühning, J., Maas, F., Morales, C. Morales, Espí, M. C. Mora, Nerling, F., Orth, H., Peters, K., Pineiro, D. Rodríguez, Saito, N., Saito, T., Lorente, A. Sánchez, Schmidt, C. J., Schwarz, C., Schwiening, J., Traxler, M., Valente, R., Voss, B., Wieczorek, P., Wilms, A., Zühlsdorf, M., Abazov, V. M., Alexeev, G., Arefiev, A., Astakhov, V. I., Barabanov, M. Yu., Batyunya, B. V., Davydov, Yu. I., Dodokhov, V. Kh., Efremov, A. A., Fedunov, A. G., Festchenko, A. A., Galoyan, A. S., Grigoryan, S., Karmokov, A., Koshurnikov, E. K., Lobanov, V. I., Lobanov, Yu. Yu., Makarov, A. F., Malinina, L. V., Malyshev, V. L., Mustafaev, G. A., Olshevskiy, A., Pasyuk, M. A., Perevalova, E. A., Piskun, A. A., Pocheptsov, T. A., Pontecorvo, G., Rodionov, V. K., Rogov, Yu. N., Salmin, R. A., Samartsev, A. G., Sapozhnikov, M. G., Shabratova, G. S., Skachkov, N. B., Skachkova, A. N., Strokovsky, E. A., Suleimanov, M. K., Teshev, R. Sh., Tokmenin, V. V., Uzhinsky, V. V., Vodopyanov, A. S., Zaporozhets, S. A., Zhuravlev, N. I., Zorin, A. G., Branford, D., Glazier, D., Watts, D., Woods, P., Britting, A., Eyrich, W., Lehmann, A., Uhlig, F., Dobbs, S., Seth, K., Tomaradze, A., Xiao, T., Bettoni, D., Carassiti, V., Ramusino, A. Cotta, Dalpiaz, P., Drago, A., Fioravanti, E., Garzia, I., Savriè, M., Stancari, G., Akishina, V., Kisel, I., Kulakov, I., Zyzak, M., Arora, R., Bel, T., Gromliuk, A., Kalicy, G., Krebs, M., Patsyuk, M., Zuehlsdorf, M., Bianchi, N., Gianotti, P., Guaraldo, C., Lucherini, V., Pace, E., Bersani, A., Bracco, G., Macri, M., Parodi, R. F., Bianco, S., Bremer, D., Brinkmann, K. T., Diehl, S., Dormenev, V., Drexler, P., Düren, M., Eissner, T., Etzelmüller, E., Föhl, K., Galuska, M., Gessler, T., Gutz, E., Hayrapetyan, A., Hu, J., Kröck, B., Kühn, W., Kuske, T., Lange, S., Liang, Y., Merle, O., Metag, V., Mülhheim, D., Münchow, D., Nanova, M., Novotny, R., Pitka, A., Quagli, T., Rieke, J., Rosenbaum, C., Schnell, R., Spruck, B., Stenzel, H., Thöring, U., Ullrich, M., Wasem, T., Werner, M., Zaunick, H. G., Ireland, D., Rosner, G., Seitz, B., Deepak, P. N., Kulkarni, A. V., Apostolou, A., Babai, M., Kavatsyuk, M., Lemmens, P., Lindemulder, M., Löhner, H., Messchendorp, J., Schakel, P., Smit, H., van der Weele, J. C., Tiemens, M., Veenstra, R., Vejdani, S., Kalita, K., Mohanta, D. P., Kumar, A., Roy, A., Sahoo, R., Sohlbach, H., Büscher, M., Cao, L., Cebulla, A., Deermann, D., Dosdall, R., Esch, S., Georgadze, I., Gillitzer, A., Goerres, A., Goldenbaum, F., Grunwald, D., Herten, A., Hu, Q., Kemmerling, G., Kleines, H., Kozlov, V., Lehrach, A., Leiber, S., Maier, R., Nellen, R., Ohm, H., Orfanitski, S., Prasuhn, D., Prencipe, E., Ritman, J., Schadmand, S., Schumann, J., Sefzick, T., Serdyuk, V., Sterzenbach, G., Stockmanns, T., Wintz, P., Wüstner, P., Xu, H., Li, S., Li, Z., Sun, Z., Rigato, V., Fissum, S., Hansen, K., Isaksson, L., Lundin, M., Schröder, B., Achenbach, P., Bleser, S., Cardinali, M., Corell, O., Deiseroth, M., Denig, A., Distler, M., Feldbauer, F., Fritsch, M., Jasinski, P., Hoek, M., Kangh, D., Karavdina, A., Lauth, W., Leithoff, H., Merkel, H., Michel, M., Motzko, C., Müller, U., Noll, O., Plueger, S., Pochodzalla, J., Sanchez, S., Schlimme, S., Sfienti, C., Steinen, M., Thiel, M., Weber, T., Zambrana, M., Dormenev, V. I., Fedorov, A. A., Korzihik, M. V., Missevitch, O. V., Balanutsa, P., Balanutsa, V., Chernetsky, V., Demekhin, A., Dolgolenko, A., Fedorets, P., Gerasimov, A., Goryachev, V., Varentsov, V., Boukharov, A., Malyshev, O., Marishev, I., Semenov, A., Konorov, I., Paul, S., Grieser, S., Hergemöller, A. K., Khoukaz, A., Köhler, E., Täschner, A., Wessels, J., Dash, S., Jadhav, M., Kumar, S., Sarin, P., Varma, R., Chandratre, V. B., Datar, V., Dutta, D., Jha, V., Kumawat, H., Mohanty, A. K., Roy, B., Yan, Y., Chinorat, K., Khanchai, K., Ayut, L., Pornrad, S., Barnyakov, A. Y., Blinov, A. E., Blinov, V. E., Bobrovnikov, V. S., Kononov, S. A., Kravchenko, E. A., Kuyanov, I. A., Onuchin, A. P., Sokolov, A. A., Tikhonov, Y. A., Atomssa, E., Hennino, T., Imre, M., Kunne, R., Galliard, C. Le, Ma, B., Marchand, D., Ong, S., Ramstein, B., Rosier, P., Tomasi-Gustafsson, E., Van de Wiele, J., Boca, G., Costanza, S., Genova, P., Lavezzi, L., Montagna, P., Rotondi, A., Abramov, V., Belikov, N., Bukreeva, S., Davidenko, A., Derevschikov, A., Goncharenko, Y., Grishin, V., Kachanov, V., Kormilitsin, V., Melnik, Y., Levin, A., Minaev, N., Mochalov, V., Morozov, D., Nogach, L., Poslavskiy, S., Ryazantsev, A., Ryzhikov, S., Semenov, P., Shein, I., Uzunian, A., Vasiliev, A., Yakutin, A., Yabsley, B., Bäck, T., Cederwall, B., Makónyi, K., Tegnér, P. E., von Würtemberg, K. M., Belostotski, S., Gavrilov, G., Izotov, A., Kashchuk, A., Levitskaya, O., Manaenkov, S., Miklukho, O., Naryshkin, Y., Suvorov, K., Veretennikov, D., Zhadanov, A., Rai, A. K., Godre, S. S., Duchat, R., Amoroso, A., Bussa, M. P., Busso, L., De Mori, F., Destefanis, M., Fava, L., Ferrero, L., Greco, M., Maggiora, M., Maniscalco, G., Marcello, S., Sosio, S., Spataro, S., Zotti, L., Calvo, D., Coli, S., De Remigis, P., Filippi, A., Giraudo, G., Lusso, S., Mazza, G., Mingnore, M., Rivetti, A., Wheadon, R., Balestra, F., Iazzi, F., Introzzi, R., Lavagno, A., Younis, H., Birsa, R., Bradamante, F., Bressan, A., Martin, A., Clement, H., Gålnander, B., Balkeståhl, L. Caldeira, Calén, H., Fransson, K., Johansson, T., Kupsc, A., Marciniewski, P., Pettersson, J., Schönning, K., Wolke, M., Zlomanczuk, J., Díaz, J., Ortiz, A., Vinodkumar, P. C., Parmar, A., Chlopik, A., Melnychuk, D., Slowinski, B., Trzcinski, A., Wojciechowski, M., Wronka, S., Zwieglinski, B., Bühler, P., Marton, J., Suzuki, K., Widmann, E., Zmeskal, J., Fröhlich, B., Khaneft, D., Lin, D., Zimmermann, I., and Semenov-Tian-Shansky, K.

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

Baryon-to-meson Transition Distribution Amplitudes (TDAs) encoding valuable new information on hadron structure appear as building blocks in the collinear factorized description for several types of hard exclusive reactions. In this paper, we address the possibility of accessing nucleon-to-pion ($\pi N$) TDAs from $\bar{p}p \to e^+e^- \pi^0$ reaction with the future \={P}ANDA detector at the FAIR facility. At high center of mass energy and high invariant mass squared of the lepton pair $q^2$, the amplitude of the signal channel $\bar{p}p \to e^+e^- \pi^0$ admits a QCD factorized description in terms of $\pi N$ TDAs and nucleon Distribution Amplitudes (DAs) in the forward and backward kinematic regimes. Assuming the validity of this factorized description, we perform feasibility studies for measuring $\bar{p}p \to e^+e^- \pi^0$ with the \={P}ANDA detector. Detailed simulations on signal reconstruction efficiency as well as on rejection of the most severe background channel, i.e. $\bar{p}p \to \pi^+\pi^- \pi^0$ were performed for the center of mass energy squared $s = 5$ GeV$^2$ and $s = 10$ GeV$^2$, in the kinematic regions $3.0 < q^2 < 4.3$ GeV$^2$ and $5 < q^2 < 9$ GeV$^2$, respectively, with a neutral pion scattered in the forward or backward cone $| \cos\theta_{\pi^0}| > 0.5 $ in the proton-antiproton center of mass frame. Results of the simulation show that the particle identification capabilities of the \={P}ANDA detector will allow to achieve a background rejection factor of $5\cdot 10^7$ ($1\cdot 10^7$) at low (high) $q^2$ for $s=5$ GeV$^2$, and of $1\cdot 10^8$ ($6\cdot 10^6$) at low (high) $q^2$ for $s=10$ GeV$^2$, while keeping the signal reconstruction efficiency at around $40\%$. At both energies, a clean lepton signal can be reconstructed with the expected statistics corresponding to $2$ fb$^{-1}$ of integrated luminosity. (.../...), Comment: 19 pages, 7 figures (some multiple), 2 tables (each double), preprint of an article for epj - v2

Published
2014

30. ABC Effect and Resonance Structure in the Double-Pionic Fusion to $^3$He

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., Doroshkevich, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. --O., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Höistad, B., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., 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., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., Shwartz, B., 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., Wagner, G. J., Wolke, M., Wrońska, A., Wüstner, P., Wurm, P., Yamamoto, A., Yurev, L., Zabierowski, J., Zieliński, M. J., Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Exclusive and kinematically complete measurements of the double pionic fusion to $^3$He have been performed in the energy region of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the $\pi\pi$-invariant mass spectrum. The experiments were carried out with the WASA detector setup at COSY. Similar to the observations in the basic $pn \to d \pi^0\pi^0$ reaction and in the $dd \to ^4$He$\pi^0\pi^0$ reaction, the data reveal a correlation between the ABC effect and a resonance-like energy dependence in the total cross section. Differential cross sections are well described by the hypothesis of $d^*$ resonance formation during the reaction process in addition to the conventional $t$-channel $\Delta\Delta$ mechanism. The deduced $d^*$ resonance width can be understood from collision broadening due to Fermi motion of the nucleons in initial and final nuclei.

Published
2014
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31. Neutron-Proton Scattering in the Context of the $d^*$(2380) Resonance

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Büscher, M., Calén, H., Ciepał, I., Clement, H., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. --O., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Hodana, M., Höistad, B., Hüsken, N., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, S., Kleines, H., Kłos, B., Krapp, M., Krzemień, W., Kulessa, P., Kupść, 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., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., 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., Wagner, G. J., Wolke, M., Wrońska, A., Wüstner, P., Wurm, P., Yamamoto, A., Yurev, L., Zabierowski, J., Zieliński, M. J., Zink, A., Złomańczuk, J., {Ż}uprański, P., {Ż}urek, M., Workman, R. L., Briscoe, W. J., and Strakovsky, I. I.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

New data on quasifree polarized neutron-proton scattering, in the region of the recently observed $d^*$ resonance structure, have been obtained by exclusive and kinematically complete high-statistics measurements with WASA at COSY. This paper details the determination of the beam polarization, checks of the quasifree character of the scattering process, on all obtained $A_y$ angular distributions and on the new partial-wave analysis, which includes the new data producing a resonance pole in the $^3D_3$-$^3G_3$ coupled partial waves at ($2380\pm10 - i40\pm5$) MeV -- in accordance with the $d^*$ dibaryon resonance hypothesis. The effect of the new partial-wave solution on the description of total and differential cross section data as well as specific combinations of spin-correlation and spin-transfer observables available from COSY-ANKE measurements at $T_d$ = 2.27 GeV is discussed.

Published
2014
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32. Charge Symmetry Breaking in dd->4He{\pi}0 with WASA-at-COSY

Author

Collaboration, 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., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. -O., Hanhart, C., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Höistad, B., Hüsken, N., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., 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., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., Shwartz, B., 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., Wurm, P., Yamamoto, A., Yurev, L., Zabierowski, J., Zieliński, M. J., Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment
Abstract

Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUMF and IUCF are currently used to develop a consistent description of CSB within the framework of chiral perturbation theory. In this work the experimental studies on the reaction dd->4He{\pi}0 have been extended towards higher excess energies in order to provide information on the contribution of p-waves in the final state. For this, an exclusive measurement has been carried out at a beam momentum of p=1.2 GeV/c using the WASA-at-COSY facility. The total cross section amounts to sigma(tot) = (118 +- 18(stat) +- 13(sys) +- 8(ext)) pb and first data on the differential cross section are consistent with s-wave pion production., Comment: 14 pages, 5 figures

Published
2014
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33. Measurement of the $\eta\to\pi^+\pi^-\pi^0$ Dalitz plot distribution

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., Doroshkevich, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. -O., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Hodana, M., Höistad, B., Hüsken, N., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., 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., Martemyanov, B. V., Meißner, U. -G., Mikirtychiants, M., Morsch, H. -P., Moskal, P., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., Shwartz, B., 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., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zieliński, M. J., Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Dalitz plot distribution of the $\eta\to\pi^+\pi^-\pi^0$ decay is determined using a data sample of $1.2\cdot 10^7$ $\eta$ mesons from $pd\to ^3\textrm{He}\eta$ reaction at 1 GeV collected by the WASA detector at COSY., Comment: 13 pages, 6 figures

Published
2014
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34. Evidence for a New Resonance from Polarized Neutron-Proton Scattering

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Ciepa, H. Calen. I., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoyev, K., Gullstroem, C. -O., Hauenstein, F., Heijkenskjoeld, L., Hejny, V., Hodana, M., Hoistad, B., Huesken, N., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirrilov, D. A., Kistryn, S., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Marianski, B., Mikirtychiants, M., Morsch, H. -P., Moskal, P., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pysniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., 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., Wagner, G. J., Wolke, M., Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yurev, L., Zabierowski, J., Zielinski, M. J., Zink, A., Zlomanczuk, J., Zupranski, P., Zurek, M., Workman, R. L., Briscoe, W. J., and Strakovsky, I. I.

Subjects
Nuclear Experiment
Abstract

Exclusive and kinematically complete high-statistics measurements of quasifree polarized $\vec{n}p$ scattering have been performed in the energy region of the narrow resonance structure $d^*$ with $I(J^P) = 0(3^+)$, $M \approx$ 2380 MeV/$c^2$ and $\Gamma \approx$ 70 MeV observed recently in the double-pionic fusion channels $pn \to d\pi^0\pi^0$ and $pn \to d\pi^+\pi^-$. The experiment was carried out with the WASA detector setup at COSY having a polarized deuteron beam impinged on the hydrogen pellet target and utilizing the quasifree process $\vec{d}p \to np + p_{spectator}$. That way the $np$ analyzing power $A_y$ was measured over a large angular range. The obtained $A_y$ angular distributions deviate systematically from the current SAID SP07 NN partial-wave solution. Incorporating the new $A_y$ data into the SAID analysis produces a pole in the $^3D_3 - ^3G_3$ waves as expected from the $d^*$ resonance hypothesis.

Published
2014
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35. Cross section ratio and angular distributions of the reaction p + d -> 3He + eta at 48.8 MeV and 59.8 MeV excess energy

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Büscher, M., Calén, H., Ciepał, I., Clement, H., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. -O., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Hodana, M., Höistad, B., Hüsken, N., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, S., Kłos, B., Kleines, H., Krapp, M., Krzemień, W., Kulessa, P., Kupść, 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., Passfeld, A., del Rio, E. Perez, Piskunov, N. M., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Sefzick, T., Serdyuk, V., 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., Wagner, G. J., Węglorz, W., Wolke, M., Wrońska, A., Wüstner, P., Wurm, P., Yamamoto, A., Yurev, L., Zabierowski, J., Zieliński, M. J., Zink, A., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment
Abstract

We present new data for angular distributions and on the cross section ratio of the p + d -> 3He + eta reaction at excess energies of Q = 48.8 MeV and Q = 59.8 MeV. The data have been obtained at the WASA-at-COSY experiment (Forschungszentrum J\"ulich) using a proton beam and a deuterium pellet target. While the shape of obtained angular distributions show only a slow variation with the energy, the new results indicate a distinct and unexpected total cross section fluctuation between Q = 20 MeV and Q = 60 MeV, which might indicate the variation of the production mechanism within this energy interval., Comment: 9 pages, 9 figures

Published
2014
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36. EuPRAXIA Conceptual Design Report

Author

Assmann, R. W., Weikum, M. K., Akhter, T., Alesini, D., Alexandrova, A. S., Anania, M. P., Andreev, N. E., Andriyash, I., Artioli, M., Aschikhin, A., Audet, T., Bacci, A., Barna, I. F., Bartocci, S., Bayramian, A., Beaton, A., Beck, A., Bellaveglia, M., Beluze, A., Bernhard, A., Biagioni, A., Bielawski, S., Bisesto, F. G., Bonatto, A., Boulton, L., Brandi, F., Brinkmann, R., Briquez, F., Brottier, F., Bründermann, E., Büscher, M., Buonomo, B., Bussmann, M. H., Bussolino, G., Campana, P., Cantarella, S., Cassou, K., Chancé, A., Chen, M., Chiadroni, E., Cianchi, A., Cioeta, F., Clarke, J. A., Cole, J. M., Costa, G., Couprie, M. -E., Cowley, J., Croia, M., Cros, B., Crump, P. A., D’Arcy, R., Dattoli, G., Del Dotto, A., Delerue, N., Del Franco, M., Delinikolas, P., De Nicola, S., Dias, J. M., Di Giovenale, D., Diomede, M., Di Pasquale, E., Di Pirro, G., Di Raddo, G., Dorda, U., Erlandson, A. C., Ertel, K., Esposito, A., Falcoz, F., Falone, A., Fedele, R., Ferran Pousa, A., Ferrario, M., Filippi, F., Fils, J., Fiore, G., Fiorito, R., Fonseca, R. A., Franzini, G., Galimberti, M., Gallo, A., Galvin, T. C., Ghaith, A., Ghigo, A., Giove, D., Giribono, A., Gizzi, L. A., Grüner, F. J., Habib, A. F., Haefner, C., Heinemann, T., Helm, A., Hidding, B., Holzer, B. J., Hooker, S. M., Hosokai, T., Hübner, M., Ibison, M., Incremona, S., Irman, A., Iungo, F., Jafarinia, F. J., Jakobsson, O., Jaroszynski, D. A., Jaster-Merz, S., Joshi, C., Kaluza, M., Kando, M., Karger, O. S., Karsch, S., Khazanov, E., Khikhlukha, D., Kirchen, M., Kirwan, G., Kitégi, C., Knetsch, A., Kocon, D., Koester, P., Kononenko, O. S., Korn, G., Kostyukov, I., Kruchinin, K. O., Labate, L., Le Blanc, C., Lechner, C., Lee, P., Leemans, W., Lehrach, A., Li, X., Li, Y., Libov, V., Lifschitz, A., Lindstrøm, C. A., Litvinenko, V., Lu, W., Lundh, O., Maier, A. R., Malka, V., Manahan, G. G., Mangles, S. P. D., Marcelli, A., Marchetti, B., Marcouillé, O., Marocchino, A., Marteau, F., Martinez de la Ossa, A., Martins, J. L., Mason, P. D., Massimo, F., Mathieu, F., Maynard, G., Mazzotta, Z., Mironov, S., Molodozhentsev, A. Y., Morante, S., Mosnier, A., Mostacci, A., Müller, A. -S., Murphy, C. D., Najmudin, Z., Nghiem, P. A. P., Nguyen, F., Niknejadi, P., Nutter, A., Osterhoff, J., Oumbarek Espinos, D., Paillard, J. -L., Papadopoulos, D. N., Patrizi, B., Pattathil, R., Pellegrino, L., Petralia, A., Petrillo, V., Piersanti, L., Pocsai, M. A., Poder, K., Pompili, R., Pribyl, L., Pugacheva, D., Reagan, B. A., Resta-Lopez, J., Ricci, R., Romeo, S., Rossetti Conti, M., Rossi, A. R., Rossmanith, R., Rotundo, U., Roussel, E., Sabbatini, L., Santangelo, P., Sarri, G., Schaper, L., Scherkl, P., Schramm, U., Schroeder, C. B., Scifo, J., Serafini, L., Sharma, G., Sheng, Z. M., Shpakov, V., Siders, C. W., Silva, L. O., Silva, T., Simon, C., Simon-Boisson, C., Sinha, U., Sistrunk, E., Specka, A., Spinka, T. M., Stecchi, A., Stella, A., Stellato, F., Streeter, M. J. V., Sutherland, A., Svystun, E. N., Symes, D., Szwaj, C., Tauscher, G. E., Terzani, D., Toci, G., Tomassini, P., Torres, R., Ullmann, D., Vaccarezza, C., Valléau, M., Vannini, M., Vannozzi, A., Vescovi, S., Vieira, J. M., Villa, F., Wahlström, C. -G., Walczak, R., Walker, P. A., Wang, K., Welsch, A., Welsch, C. P., Weng, S. M., Wiggins, S. M., Wolfenden, J., Xia, G., Yabashi, M., Zhang, H., Zhao, Y., Zhu, J., and Zigler, A.

Published
2020
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37. Erratum to: EuPRAXIA Conceptual Design Report: Eur. Phys. J. Special Topics 229, 3675-4284 (2020), https://doi.org/10.1140/epjst/e2020-000127-8

Author

Assmann, R. W., Weikum, M. K., Akhter, T., Alesini, D., Alexandrova, A. S., Anania, M. P., Andreev, N. E., Andriyash, I., Artioli, M., Aschikhin, A., Audet, T., Bacci, A., Barna, I. F., Bartocci, S., Bayramian, A., Beaton, A., Beck, A., Bellaveglia, M., Beluze, A., Bernhard, A., Biagioni, A., Bielawski, S., Bisesto, F. G., Bonatto, A., Boulton, L., Brandi, F., Brinkmann, R., Briquez, F., Brottier, F., Bründermann, E., Büscher, M., Buonomo, B., Bussmann, M. H., Bussolino, G., Campana, P., Cantarella, S., Cassou, K., Chancé, A., Chen, M., Chiadroni, E., Cianchi, A., Cioeta, F., Clarke, J. A., Cole, J. M., Costa, G., Couprie, M. -E., Cowley, J., Croia, M., Cros, B., Crump, P. A., D’Arcy, R., Dattoli, G., Del Dotto, A., Delerue, N., Del Franco, M., Delinikolas, P., De Nicola, S., Dias, J. M., Di Giovenale, D., Diomede, M., Di Pasquale, E., Di Pirro, G., Di Raddo, G., Dorda, U., Erlandson, A. C., Ertel, K., Esposito, A., Falcoz, F., Falone, A., Fedele, R., Ferran Pousa, A., Ferrario, M., Filippi, F., Fils, J., Fiore, G., Fiorito, R., Fonseca, R. A., Franzini, G., Galimberti, M., Gallo, A., Galvin, T. C., Ghaith, A., Ghigo, A., Giove, D., Giribono, A., Gizzi, L. A., Grüner, F. J., Habib, A. F., Haefner, C., Heinemann, T., Helm, A., Hidding, B., Holzer, B. J., Hooker, S. M., Hosokai, T., Hübner, M., Ibison, M., Incremona, S., Irman, A., Iungo, F., Jafarinia, F. J., Jakobsson, O., Jaroszynski, D. A., Jaster-Merz, S., Joshi, C., Kaluza, M., Kando, M., Karger, O. S., Karsch, S., Khazanov, E., Khikhlukha, D., Kirchen, M., Kirwan, G., Kitégi, C., Knetsch, A., Kocon, D., Koester, P., Kononenko, O. S., Korn, G., Kostyukov, I., Kruchinin, K. O., Labate, L., Le Blanc, C., Lechner, C., Lee, P., Leemans, W., Lehrach, A., Li, X., Li, Y., Libov, V., Lifschitz, A., Lindstrøm, C. A., Litvinenko, V., Lu, W., Lundh, O., Maier, A. R., Malka, V., Manahan, G. G., Mangles, S. P. D., Marcelli, A., Marchetti, B., Marcouillé, O., Marocchino, A., Marteau, F., Martinez de la Ossa, A., Martins, J. L., Mason, P. D., Massimo, F., Mathieu, F., Maynard, G., Mazzotta, Z., Mironov, S., Molodozhentsev, A. Y., Morante, S., Mosnier, A., Mostacci, A., Müller, A. -S., Murphy, C. D., Najmudin, Z., Nghiem, P. A. P., Nguyen, F., Niknejadi, P., Nutter, A., Osterhoff, J., Oumbarek Espinos, D., Paillard, J. -L., Papadopoulos, D. N., Patrizi, B., Pattathil, R., Pellegrino, L., Petralia, A., Petrillo, V., Piersanti, L., Pocsai, M. A., Poder, K., Pompili, R., Pribyl, L., Pugacheva, D., Reagan, B. A., Resta-Lopez, J., Ricci, R., Romeo, S., Rossetti Conti, M., Rossi, A. R., Rossmanith, R., Rotundo, U., Roussel, E., Sabbatini, L., Santangelo, P., Sarri, G., Schaper, L., Scherkl, P., Schramm, U., Schroeder, C. B., Scifo, J., Serafini, L., Sharma, G., Sheng, Z. M., Shpakov, V., Siders, C. W., Silva, L. O., Silva, T., Simon, C., Simon-Boisson, C., Sinha, U., Sistrunk, E., Specka, A., Spinka, T. M., Stecchi, A., Stella, A., Stellato, F., Streeter, M. J. V., Sutherland, A., Svystun, E. N., Symes, D., Szwaj, C., Tauscher, G. E., Terzani, D., Toci, G., Tomassini, P., Torres, R., Ullmann, D., Vaccarezza, C., Valléau, M., Vannini, M., Vannozzi, A., Vescovi, S., Vieira, J. M., Villa, F., Wahlström, C. -G., Walczak, R., Walker, P. A., Wang, K., Welsch, A., Welsch, C. P., Weng, S. M., Wiggins, S. M., Wolfenden, J., Xia, G., Yabashi, M., Zhang, H., Zhao, Y., Zhu, J., and Zigler, A.

Published
2020
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38. Measurement of the $pn \to pp\pi^0\pi^-$ Reaction in Search for the Recently Observed Resonance Structure in $d\pi^0\pi^0$ and $d\pi^+\pi^-$ systems

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Büscher, M., Calén, H., Ciepał, I., Clement, H., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. --O., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Hinterberger, F., Hodana, M., Höistad, B., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, S., Klaja, J., Kleines, H., Kłos, B., Krapp, M., Krzemień, W., Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Mikirtychiants, M., Morsch, H. --P., Moskal, P., Nandi, B. K., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Pluciński, P., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schmidt, A., Schadmand, S., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Tolba, T., Trzciński, A., Varma, R., Wagner, G. J., Węglorz, W., Wolke, M., Wrońska, A., Wüstner, P., Wurm, P., Yamamoto, A., Yuan, X., Zabierowski, J., Zheng, C., Zieliński, M. J., Zipper, W., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment
Abstract

Exclusive measurements of the quasi-free $pn \to pp\pi^0\pi^-$ reaction 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 $\sqrt s$ = (2.35 - 2.46) GeV, which includes the region of the ABC effect and its associated resonance structure. No ABC effect, {\it i.e.} low-mass enhancement is found in the $\pi^0\pi^-$-invariant mass spectrum -- in agreement with the constraint from Bose statistics that the isovector pion pair can not be in relative s-wave. At the upper end of the covered energy region $t$-channel processes for Roper, $\Delta(1600)$ and $\Delta\Delta$ excitations provide a reasonable description of the data, but at low energies the measured cross sections are much larger than predicted by such processes. Adding a resonance amplitude for the resonance at $m$=~2.37 GeV with $\Gamma$ =~70 MeV and $I(J^P)=~0(3^+)$ observed recently in $pn \to d\pi^0\pi^0$ and $pn \to d\pi^+\pi^-$ reactions leads to an agreement with the data also at low energies.

Published
2013
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39. Investigation of the dd -> 3He n \pi 0 reaction with the FZ J\'ulich WASA-at-COSY facility

Author

Collaboration, WASA-at-COSY, Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berłowski, M., Bhatt, H., Büscher, M., Calén, H., Ciepał, I., Clement, H., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. --O., Hanhart, C., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Hinterberger, F., Hodana, M., Höistad, B., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, S., Klaja, J., Kleines, H., Kłos, B., Krapp, M., Krzemień, W., Kulessa, P., Kupść, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Mikirtychiants, M., Morsch, H. --P., Moskal, P., Nandi, B. K., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N. M., Pluciński, P., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schmidt, A., Schadmand, S., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Tolba, T., Trzciński, A., Varma, R., Wagner, G. J., Węglorz, W., Wolke, M., Wrońska, A., Wüstner, P., Wurm, P., Yamamoto, A., Yuan, X., Zabierowski, J., Zheng, C., Zieliński, M. J., Zipper, W., Złomańczuk, J., Żuprański, P., and Żurek, M.

Subjects
Nuclear Experiment
Abstract

An exclusive measurement of the dd -> 3He n \pi 0 reaction was carried at a beam momentum of p = 1.2 GeV/c using the WASA-at-COSY facility. For the first time data on the total cross section as well as differential distributions were obtained. The data are described with a phenomenological approach based on a combination of a quasi-free model and a partial wave expansion for three-body reaction. The total cross section is found to be \sigma(tot) = (2.89 +- 0.01(stat) +- 0.06(sys) +- 0.29(norm)) \mu b. The contribution of the quasi-free processes (with the neutron being target or beam spectator) accounts for 38% of the total cross section and dominates the differential distributions in specific regions of the phase space. The remaining part of the cross section can be described within a partial wave decomposition indicating the significance of p-wave contributions in the final state., Comment: 9 pages, 7 figures

Published
2013
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40. Search for a dark photon in the $\pi^0 \to e^+e^-\gamma$ decay

Author

Collaboration, 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., Coderre, D., Czerwiński, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, C. -O., Hauenstein, F., Heijkenskjöld, L., Hejny, V., Hinterberger, F., Hodana, M., Höistad, B., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Kłos, B., Krapp, M., Krzemień, W., Kulessa, P., Kupść, A., Kuzmin, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Mariański, B., Meißner, U. -G., Mikirtychiants, M., Morsch, H. -P., Moskal, P., Nandi, B. K., Ohm, H., Ozerianska, I., del Rio, E. Perez, Piskunov, N., Pluciński, P., Podkopał, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Shwartz, B., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Tolba, T., Trzciński, A., Varma, R., Wagner, G. J., Wȩglorz, W., Wirzba, A., Wolke, M., Wrońska, A., Wüstner, P., Wurm, P., Yamamoto, A., Zabierowski, J., Zieliński, M. J., Zipper, W., Złomańczuk, J., Żuprański, P., and Żurek, M.

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

The presently world largest data sample of pi0 --> gamma e+e- decays containing nearly 5E5 events was collected using the WASA detector at COSY. A search for a dark photon U produced in the pi0 --> gamma U --> gamma e+e- decay from the pp-->pp\pi^0 reaction was carried out. An upper limit on the square of the U-gamma mixing strength parameter epsilon^2 of 5e-6 at 90% CL was obtained for the mass range 20 MeV

Published
2013
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42. Search for the eta-mesic 4He with WASA-at-COSY detector

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Buescher, M., Calen, H., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullstroem, C. -O., Hauenstein, F., Heijkenskjoeld, L., Hejny, V., Hinterberger, F., Hodana, M., Hoeistad, B., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Marianski, B., Mikirtychiants, M., Morsch, H. -P., Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Ozerianska, I., del Rio, E. Perez, Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Weglorz, W., Wolke, M., Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, J., Zupranski, P., and Zurek, M.

Subjects
Nuclear Experiment
Abstract

An exclusive measurement of the excitation function for the dd->3Heppi- reaction was performed at the Cooler Synchrotron COSY-Juelich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 GeV/c to 2.400 GeV/c crossing the kinematic threshold for the eta meson production in the dd->4He-eta reaction at 2.336 GeV/c. The corresponding excess energy with respect to the 4He-eta system varied from -51.4MeV to 22MeV. The integrated luminosity in the experiment was determined using the dd->3Hen reaction. The shape of the excitation function for the dd->3Heppi- was examined. No signal of the 4He-eta bound state was observed. An upper limit for the cross-section for the bound state formation and decay in the process dd->(4He-eta)bound->3Heppi- was determined on the 90% confidence level and it varies from 20nb to 27nb for the bound state width ranging from 5MeV to 35MeV, respectively., Comment: 8 pages, 9 figures

Published
2013
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43. Ring Rolling of IN 718 for Critical Engine Applications

Author

Büscher, M., Witulski, T., Ott, Eric, editor, Liu, Xingbo, editor, Andersson, Joel, editor, Bi, Zhongnan, editor, Bockenstedt, Kevin, editor, Dempster, Ian, editor, Groh, Jon, editor, Heck, Karl, editor, Jablonski, Paul, editor, Kaplan, Max, editor, Nagahama, Daisuke, editor, and Sudbrack, Chantal, editor

Published
2018
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44. Isospin Decomposition of the Basic Double-Pionic Fusion in the Region of the ABC Effect

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Büscher, M., Calen, H., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Föhl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullstrom, C. -O., Hauenstein, F., Heijkenskjol, L., Hejny, V., Hinterberger, F., Hodana, M., Hoistad, B., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krapp, M., Krzemien, W., Kulessa, P., Kupsc, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Marianski, B., Mikirtychiants, M., Morsch, H. -P., Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Ozerianska, I., del Rio, E. Perez, Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Sefzick, T., Serdyuk, V., Shah, N., Siemaszko, M., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Stephan, E., Sterzenbach, G., Stockhorst, H., Ströher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Wkeglorz, W., Wolke, M., Wronska, A., Wüstner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, J., Zupranski, P., and Zurek, M.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Exclusive and kinematically complete high-statistics measurements of the basic double pionic fusion reactions pn -> dpi0pi0, pn -> d pi+pi- and pp -> dpi+pi0 have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given by the dpi0pi0 channel exhibits the ABC effect, i.e. a low-mass enhancement in the pipi-invariant mass distribution, as well as the associated resonance structure in the total cross section, the isovector part given by the dpi+pi0 channel shows a smooth behavior consistent with the conventional t-channel Delta Delta process. The dpi+pi- data are very well reproduced by combining the data for isovector and isoscalar contributions, if the kinematical consequences of the isospin violation due to different masses for charged and neutral pions are taken into account.

Published
2012
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45. Technical Design Report for the: PANDA Micro Vertex Detector

Author

PANDA Collaboration, Erni, W., Keshelashvili, I., Krusche, B., Steinacher, M., Heng, Y., Liu, Z., Liu, H., Shen, X., Wang, Q., Xu, H., Albrecht, M., Becker, J., Eickel, K., Feldbauer, F., Fink, M., Friedel, P., Heinsius, F. H., Held, T., Koch, H., Kopf, B., Leyhe, M., Motzko, C., Pelizäus, M., Pychy, J., Roth, B., Schröder, T., Schulze, J., Steinke, M., Trifterer, T., Wiedner, U., Zhong, J., Beck, R., Becker, M., Bianco, S., Brinkmann, K. -Th., Hammann, C., Hinterberger, F., Jäkel, R., Kaiser, D., Kliemt, R., Koop, K., Schmidt, C., Schnell, R., Thoma, U., Vlasov, P., Wendel, C., Winnebeck, A., Würschig, Th., Zaunick, H. -G., Bianconi, A., Bragadireanu, M., Caprini, M., Ciubancan, M., Pantea, D., Tarta, P. -D, De Napoli, M., Giacoppo, F., Rapisarda, E., Sfienti, C., Fiutowski, T., Idzik, N., Mindur, B., Przyborowski, D., Swientek, K., Bialkowski, E., Budzanowski, A., Czech, B., Kliczewski, S., Kozela, A., Kulessa, P., Lebiedowicz, P., Malgorzata, K., Pysz, K., Schäfer, W., Siudak, R., Szczurek, A., Brandys, P., Czyzewski, T., Czyzycki, W., Domagala, M., Hawryluk, M., Filo, G., Kwiatkowski, D., Lisowski, E., Lisowski, F., Bardan, W., Gil, D., Kamys, B., Kistryn, St., Korcyl, K., Krzemieñ, W., Magiera, A., Moskal, P., Rudy, Z., Salabura, P., Smyrski, J., Wroñska, A., Al-Turany, M., Arora, R., Augustin, I., Deppe, H., Dutta, D., Flemming, H., Götzen, K., Hohler, G., Karabowicz, R., Lehmann, D., Lewandowski, B., Lühning, J., Maas, F., Orth, H., Peters, K., Saito, T., Schepers, G., Schmidt, C. J., Schmitt, L., Schwarz, C., Schwiening, J., Voss, B., Wieczorek, P., Wilms, A., Abazov, V. M., Alexeev, G. D., Arefiev, V. A., Astakhov, V. I., Barabanov, M. Yu., Batyunya, B. V., Davydov, Yu. I., Dodokhov, V. Kh., Efremov, A. A., Fedunov, A. G., Feshchenko, A. A., Galoyan, A. S., Grigoryan, S., Karmokov, A., Koshurnikov, E. K., Lobanov, V. I., Lobanov, Yu. Yu., Makarov, A. F., Malinina, L. V., Malyshev, V. L., Mustafaev, G. A., Olshevski, A. G., Pasyuk, M. A., Perevalova, E. A., Piskun, A. A., Pocheptsov, T. A., Pontecorvo, G., Rodionov, V. K., Rogov, Yu. N., Salmin, R. A., Samartsev, A. G., Sapozhnikov, M. G., Shabratova, G. S., Skachkova, A. N., Skachkov, N. B., Strokovsky, E. A., Suleimanov, M. K., Teshev, R. Sh., Tokmenin, V. V., Uzhinsky, V. V., Vodopyanov, A. S., Zaporozhets, S. A., Zhuravlev, N. I., Zorin, A. G., Branford, D., Glazier, D., Watts, D., Woods, P., Britting, A., Eyrich, W., Lehmann, A., Uhlig, F., Dobbs, S., Metreveli, Z., Seth, K., Tann, B., Tomaradze, A., Bettoni, D., Carassiti, V., Dalpiaz, P., Drago, A., Fioravanti, E., Garzia, I., Negrini, M., Savriè, M., Stancari, G., Dulach, B., Gianotti, P., Guaraldo, C., Lucherini, V., Pace, E., Bersani, A., Macri, M., Marinelli, M., Parodi, R. F., Dormenev, V., Drexler, P., Düren, M., Eisner, T., Foehl, K., Hayrapetyan, A., Koch, P., Krïoch, B., Kühn, W., Lange, S., Liang, Y., Liu, M., Merle, O., Metag, V., Moritz, M., Nanova, M., Novotny, R., Spruck, B., Stenzel, H., Strackbein, C., Thiel, M., Clarkson, T., Euan, C., Hill, G., Hoek, M., Ireland, D., Kaiser, R., Keri, T., Lehmann, I., Livingston, K., Lumsden, P., MacGregor, D., McKinnon, B., Montgomery, R., Murray, M., Protopopescu, D., Rosner, G., Seitz, B., Yang, G., Babai, M., Biegun, A. K., Glazenborg-Kluttig, A., Guliyev, E., Jothi, V. S., Kavatsyuk, M., Lemmens, P., Löhner, H., Messchendorp, J., Poelman, T., Smit, H., van der Weele, J. C., Sohlbach, H., Büscher, M., Dosdall, R., Dzhygadlo, R., Esch, S., Gillitzer, A., Goldenbaum, F., Grunwald, D., Jha, V., Kemmerling, G., Kleines, H., Lehrach, A., Maier, R., Mertens, M., Ohm, H., Pohl, D. L., Prasuhn, D., Randriamalala, T., Ritman, J., Roeder, M., Sterzenbach, G., Stockmanns, T., Wintz, P., Wüstner, P., Kisiel, J., Li, S., Li, Z., Sun, Z., Fissum, K., Hansen, K., Isaksson, L., Lundin, M., Schröder, B., Achenbach, P., Denig, A., Distler, M., Fritsch, M., Kangh, D., Karavdina, A., Lauth, W., Michel, M., Espi, M. C. Mora, Pochodzalla, J., Sanchez, S., Sanchez-Lorente, A., Weber, T., Dormenev, V. I., Fedorov, A. A., Korzhik, M. V., Missevitch, O. V., Balanutsa, V., Chernetsky, V., Demekhin, A., Dolgolenko, A., Fedorets, P., Gerasimov, A., Goryachev, V., Boukharov, A., Malyshev, O., Marishev, I., Semenov, A., Varma, R., Ketzer, B., Konorov, I., Mann, A., Neubert, S., Paul, S., Vandenbroucke, M., Zhang, Q., Khoukaz, A., Rausmann, T., Täschner, A., Wessels, J., Baldin, E., Kotov, K., Peleganchuk, S., Tikhonov, Yu., Hennino, T., Imre, M., Kunne, R., Galliard, C. Le, Normand, J. P. Le, Marchand, D., Maroni, A., Ong, S., Pouthas, J., Ramstein, B., Rosier, P., Sudol, M., Theneau, C., Tomasi-Gustafsson, E., Van de Wiele, J., Zerguerras, T., Boca, G., Braghieri, A., Costanza, S., Fontana, A., Genova, P., Lavezzi, L., Montagna, P., Rotondi, A., Buda, V., Abramov, V. V., Davidenko, A. M., Derevschikov, A. A., Goncharenko, Y. M., Grishin, V. N., Kachanov, V. A., Konstantinov, D. A., Kormilitsin, V. A., Matulenko, Y. A., Melnik, Y. M., Meschanin, A. P., Minaev, N. G., Mochalov, V. V., Morozov, D. A., Nogach, L. V., Nurushev, S. B., Ryazantsev, A. V., Semenov, P. A., Soloviev, L. F., Uzunian, A. V., Vasiliev, A. N., Yakutin, A. E., Belostotski, S., Gavrilov, G., Itzotov, A., Kisselev, A., Kravchenko, P., Manaenkov, S., Miklukho, O., Naryshkin, Y., Veretennikov, D., Vikhrov, V., Zhadanov, A., Bäck, T., Cederwall, B., Bargholtz, C., Gerén, L., Tegnér, P. E., Thørngren, P., von Würtemberg, K. M., Fava, L., Alberto, D., Amoroso, A., Bussa, M. P., Busso, L., De Mori, F., Destefanis, M., Ferrero, L., Greco, M., Kugathasan, T., Maggiora, M., Marcello, S., Sosio, S., Spataro, S., Calvo, D., Coli, S., De Remigis, P., Filippi, A., Giraudo, G., Lusso, S., Mazza, G., Mignone, M., Rivetti, A., Wheadon, R., Zotti, L., Morra, O., Iazzi, F., Lavagno, A., Quarati, P., Szymanska, K., Birsa, R., Bradamante, F., Bressan, A., Martin, A., Clement, H., Galnander, B., Calén, H., Fransson, K., Johansson, T., Kupsc, A., Marciniewski, P., Thomé, E., Wolke, M., Zlomanczuk, J., Díaz, J., Ortiz, A., Buda, P., Dmowski, K., Korzeniewski, R., Przemyslaw, D., Slowinski, B., Borsuk, S., Chlopik, A., Guzik, Z., Kopec, J., Kozlowski, T., Melnychuk, D., Plominski, M., Szewinski, J., Traczyk, K., Zwieglinski, B., Bühler, P., Gruber, A., Kienle, P., Marton, J., Widmann, E., and Zmeskal, J.

Subjects
Physics - Instrumentation and Detectors
Abstract

This document illustrates the technical layout and the expected performance of the Micro Vertex Detector (MVD) of the PANDA experiment. The MVD will detect charged particles as close as possible to the interaction zone. Design criteria and the optimisation process as well as the technical solutions chosen are discussed and the results of this process are subjected to extensive Monte Carlo physics studies. The route towards realisation of the detector is outlined., Comment: 189 pages, 225 figures, 41 tables

Published
2012

46. ABC Resonance Structure in the Double-Pionic Fusion to 4He

Author

Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bednarski, T., Bergmann, F. S., Berlowski, M., Bhatt, H., Brinkmann, K. T., Buescher, M., Calen, H., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, K., Goldenbaum, F., Goslawski, P., Grigoryev, K., Gullstroem, C. O., Hauenstein, F., Heijkenskjold, L., Hejny, V., Hinterberger, F., Hodana, M., Hoistad, B., Husmann, C., Jany, A., Jany, B. R., Jarczyk, L., Johansson, T., Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kistryn, S., Klaja, J., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, A., Lalwani, K., Lersch, D., Li, L., Lorentz, B., Magiera, A., Maier, R., Marciniewski, P., Marianski, B., Mikirtychiants, M., Morsch, H. P., Moskal, P., Nandi, B. K., Niedzwiecki, S., Ohm, H., Ozerianska, I., Pauly, C., del Rio, E. Perez, Petukhov, Y., Plucinski, P., Podkopal, P., Prasuhn, D., Pricking, A., Pszczel, D., Pysz, K., Pyszniak, A., Redmer, C. F., Ritman, J., Roy, A., Rudy, Z., Sawant, S., Schadmand, S., Schmidt, A., Serdyuk, V., Shah, N., Siudak, R., Skorodko, T., Skurzok, M., Smyrski, J., Sopov, V., Stassen, R., Stepaniak, J., Sterzenbach, G., Stockhorst, H., Stroeher, H., Szczurek, A., Tolba, T., Trzcinski, A., Varma, R., Vlasov, P., Wagner, G. J., Wkeglorz, W., Wolke, M., Wronska, A., Wuestner, P., Wurm, P., Yamamoto, A., Yuan, X., Yurev, L., Zabierowski, J., Zheng, C., Zielinski, M. J., Zipper, W., Zlomanczuk, J., and Zupranski, P.

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

Exclusive and kinematically complete high-statistics measurements of the double pionic fusion reaction $dd \to ^4$He$\pi^0\pi^0$ have been performed in the energy range 0.8 - 1.4 GeV covering thus the region of the ABC effect, which denotes a pronounced low-mass enhancement in the $\pi\pi$-invariant mass spectrum. The experiments were carried out with the WASA detector setup at COSY. Similar to the observation in the basic $pn \to d \pi^0\pi^0$ reaction, the data reveal a correlation between the ABC effect and a resonance-like energy dependence in the total cross section. The maximum occurs at m=2.37 GeV + 2$m_N$, i.e. at the same position as in the basic reaction. The observed resonance width $\Gamma \approx$ 160 MeV can be understood from broadening due to Fermi motion of the nucleons in initial and final nuclei together with collision damping. Differential cross sections are described equally well by the hypothesis of a $pn$ resonance formation during the reaction process.

Published
2012
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47. Technical Design Report for the: PANDA Straw Tube Tracker

Author

PANDA Collaboration, Erni, W., Keshelashvili, I., Krusche, B., Steinacher, M., Heng, Y., Liu, Z., Liu, H., Shen, X., Wang, Q., Xu, H., Aab, A., Albrecht, M., Becker, J., Csapó, A., Feldbauer, F., Fink, M., Friedel, P., Heinsius, F. H., Held, T., Klask, L., Koch, H., Kopf, B., Leiber, S., Leyhe, M., Motzko, C., Pelizäus, M., Pychy, J., Roth, B., Schröder, T., Schulze, J., Sowa, C., Steinke, M., Trifterer, T., Wiedner, U., Zhong, J., Beck, R., Bianco, S., Brinkmann, K. T., Hammann, C., Hinterberger, F., Kaiser, D., Kliemt, R., Kube, M., Pitka, A., Quagli, T., Schmidt, C., Schmitz, R., Schnell, R., Thoma, U., Vlasov, P., Walther, D., Wendel, C., Würschig, T., Zaunick, H. G., Bianconi, A., Bragadireanu, M., Caprini, M., Pantea, D., Pantelica, D., Pietreanu, D., Serbina, L., Tarta, P. D., Kaplan, D., Fiutowski, T., Idzik, M., Mindur, B., Przyborowski, D., Swientek, K., Czech, B., Kistryn, M., Kliczewski, S., Kozela, A., Kulessa, P., Lebiedowicz, P., Pysz, K., Schäfer, W., Siudak, R., Szczurek, A., Jowzaee, S., Kajetanowicz, M., Kamys, B., Kistryn, S., Korcyl, G., Korcyl, K., Krzemien, W., Magiera, A., Moskal, P., Palka, M., Rudy, Z., Salabura, P., Smyrski, J., Wrońska, A., Augustin, I., Lehmann, I., Nimorus, D., Schepers, G., Al-Turany, M., Arora, R., Deppe, H., Flemming, H., Gerhardt, A., Götzen, K., Jordi, A. F., Kalicy, G., Karabowicz, R., Lehmann, D., Lewandowski, B., Lühning, J., Maas, F., Orth, H., Patsyuk, M., Peters, K., Saito, T., Schmidt, C. J., Schmitt, L., Schwarz, C., Schwiening, J., Traxler, M., Voss, B., Wieczorek, P., Wilms, A., Zühlsdorf, M., Abazov, V. M., Alexeev, G., Arefiev, A., Astakhov, V. I., Barabanov, M. Yu., Batyunya, B. V., Davydov, Yu. I., Dodokhov, V. Kh., Efremov, A. A., Fedunov, A. G., Festchenko, A. A., Galoyan, A. S., Grigoryan, S., Karmokov, A., Koshurnikov, E. K., Lobanov, V. I., Lobanov, Yu. Yu., Makarov, A. F., Malinina, L. V., Malyshev, V. L., Mustafaev, G. A., Olshevskiy, A., Pasyuk, M. A., Perevalova, E. A., Piskun, A. A., Pocheptsov, T. A., Pontecorvo, G., Rodionov, V. K., Rogov, Yu. N., Salmin, R. A., Samartsev, A. G., Sapozhnikov, M. G., Shabratova, G. S., Skachkova, A. N., Skachkov, N. B., Strokovsky, E. A., Suleimanov, M. K., Teshev, R. Sh., Tokmenin, V. V., Uzhinsky, V. V., Vodopyanov, A. S., Zaporozhets, S. A., Zhuravlev, N. I., Zorin, A. G., Branford, D., Glazier, D., Watts, D., Woods, P., Britting, A., Eyrich, W., Lehmann, A., Uhlig, F., Dobbs, S., Metreveli, Z., Seth, K., Tomaradze, A., Xiao, T., Bettoni, D., Carassiti, V., Ramusino, A. Cotta, Dalpiaz, P., Drago, A., Fioravanti, E., Garzia, I., Savriè, M., Stancari, G., Bianchi, N., Gianotti, P., Guaraldo, C., Lucherini, V., Orecchini, D., Pace, E., Bersani, A., Bracco, G., Macri, M., Parodi, R. F., Bremer, D., Dormenev, V., Drexler, P., Düren, M., Eissner, T., Föhl, K., Galuska, M., Gessler, T., Hayrapetyan, A., Hu, J., Koch, P., Kröck, B., Kühn, W., Lange, S., Liang, Y., Merle, O., Metag, V., Moritz, M., Münchow, D., Nanova, M., Novotny, R., Spruck, B., Stenzel, H., Ullrich, T., Werner, M., Euan, C., Hoek, M., Ireland, D., Keri, T., Montgomery, R., Protopopescu, D., Rosner, G., Seitz, B., Babai, M., Glazenborg-Kluttig, A., Kavatsyuk, M., Lemmens, P., Lindemulder, M., Löhner, H., Messchendorp, J., Moeini, H., Schakel, P., Schreuder, F., Smit, H., Tambave, G., van der Weele, J. C., Veenstra, R., Sohlbach, H., Büscher, M., Deermann, D., Dosdall, R., Esch, S., Gillitzer, A., Goldenbaum, F., Grunwald, D., Henssler, S., Herten, A., Hu, Q., Kemmerling, G., Kleines, H., Kozlov, V., Lehrach, A., Maier, R., Mertens, M., Ohm, H., Orfanitski, S., Prasuhn, D., Randriamalala, T., Ritman, J., Schadmand, S., Serdyuk, V., Sterzenbach, G., Stockmanns, T., Wintz, P., Wüstner, P., Kisiel, J., Li, S., Li, Z., Sun, Z., Rigato, V., Fissum, S., Hansen, K., Isaksson, L., Lundin, M., Schröder, B., Achenbach, P., Bleser, S., Cahit, U., Cardinali, M., Denig, A., Distler, M., Fritsch, M., Kangh, D., Karavdina, A., Lauth, W., Merkel, H., Michel, M., Espi, M. C. Mora, Müller, U., Pochodzalla, J., Prometeusz, J., Sanchez, S., Sanchez-Lorente, A., Schlimme, S., Sfienti, C., Thiel, M., Weber, T., Dormenev, V. I., Fedorov, A. A., Korzhik, M. V., Missevitch, O. V., Balanutsa, V., Chernetsky, V., Demekhin, A., Dolgolenko, A., Fedorets, P., Gerasimov, A., Goryachev, V., Varentsov, V., Boukharov, A., Malyshev, O., Marishev, I., Semenov, A., Böhmer, F., Dørheim, S., Ketzer, B., Paul, S., Hergemöller, A. K., Khoukaz, A., Köhler, E., Täschner, A., Wessels, J., Varma, R., Chaterjee, A., Jha, V., Kailas, S., Roy, B., Yan, Y., Chinorat, K., Khanchai, K., Ayut, L., Pomrad, S., Baldin, E., Kotov, K., Peleganchuk, S., Tikhonov, Yu., Boucher, J., Chambert, V., Dbeyssi, A., Hennino, T., Imre, M., Kunne, R., Galliard, C. Le, Ma, B., Marchand, D., Maroni, A., Ong, S., Ramstein, B., Rosier, P., Sudol, M., Tomasi-Gustafsson, E., Van de Wiele, J., Boca, G., Braghieri, A., Costanza, S., Genova, P., Lavezzi, L., Montagna, P., Rotondi, A., Abramov, V., Belikov, N., Davidenko, A., Derevschikov, A., Goncharenko, Y., Grishin, V., Kachanov, V., Konstantinov, D., Kormilitsin, V., Melnik, Y., Levin, A., Minaev, N., Mochalov, V., Morozov, D., Nogach, L., Poslavskiy, S., Ryazantsev, A., Ryzhikov, S., Semenov, P., Shein, I., Uzunian, A., Vasiliev, A., Yakutin, A., Bäck, T., Cederwall, B., Makónyi, K., Tegnér, P. E., von Würtemberg, K. M., Belostotski, S., Gavrilov, G., Itzotov, A., Kashchuk, A., Kisselev, A., Kravchenko, P., Levitskaya, O., Manaenkov, S., Miklukho, O., Naryshkin, Y., Veretennikov, D., Vikhrov, V., Zhadanov, A., Alberto, D., Amoroso, A., Bussa, M. P., Busso, L., De Mori, F., Destefanis, M., Fava, L., Ferrero, L., Greco, M., Maggiora, M., Marcello, S., Sosio, S., Spataro, S., Zotti, L., Calvo, D., Coli, S., De Remigis, P., Filippi, A., Giraudo, G., Lusso, S., Mazza, G., Morra, O., Rivetti, A., Wheadon, R., Iazzi, F., Lavagno, A., Younis, H., Birsa, R., Bradamante, F., Bressan, A., Martin, A., Clement, H., Galander, B., Balkeståhl, L. Caldeira, Calén, H., Fransson, K., Johansson, T., Kupsc, A., Marciniewski, P., Thomé, E., Wolke, M., Zlomanczuk, J., Díaz, J., Ortiz, A., Dmowski, K., Duda, P., Korzeniewski, R., Slowinski, B., Chlopik, A., Guzik, Z., Kosinski, K., Melnychuk, D., Wasilewski, A., Wojciechowski, M., Wronka, S., Wysocka, A., Zwieglinski, B., Bühler, P., Hartman, O., Kienle, P., Marton, J., Suzuki, K., Widmann, E., and Zmeskal, J.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

This document describes the technical layout and the expected performance of the Straw Tube Tracker (STT), the main tracking detector of the PANDA target spectrometer. The STT encloses a Micro-Vertex-Detector (MVD) for the inner tracking and is followed in beam direction by a set of GEM-stations. The tasks of the STT are the measurement of the particle momentum from the reconstructed trajectory and the measurement of the specific energy-loss for a particle identification. Dedicated simulations with full analysis studies of certain proton-antiproton reactions, identified as being benchmark tests for the whole PANDA scientific program, have been performed to test the STT layout and performance. The results are presented, and the time lines to construct the STT are described., Comment: accepted for publication on EPJA

Published
2012
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48. The production of K+K- pairs in proton-proton collisions at 2.83 GeV

Author

Ye, Q. J., Hartmann, M., Maeda, Y., Barsov, S., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gao, H., Gebel, R., Hejny, V., Kacharava, A., Keshelashvili, I., Kiselev, Yu. T., Khoukaz, A., Koptev, V. P., Kulessa, P., Kulikov, A., Lorentz, B., Mersmann, T., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Paryev, E. Ya., Polyanskiy, A., Serdyuk, V., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Yu., Wilkin, C., and Wuestner, P.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Differential and total cross sections for the pp -> ppK+K- reaction have been measured at a proton beam energy of 2.83 GeV using the COSY-ANKE magnetic spectrometer. Detailed model descriptions fitted to a variety of one-dimensional distributions permit the separation of the pp -> pp phi cross section from that of non-phi production. The differential spectra show that higher partial waves represent the majority of the pp -> pp phi total cross section at an excess energy of 76 MeV, whose energy dependence would then seem to require some s-wave phi-p enhancement near threshold. The non-phi data can be described in terms of the combined effects of two-body final state interactions using the same effective scattering parameters determined from lower energy data., Comment: 12 pages, 12 figures, 3 tables

Published
2012
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49. Momentum dependence of the phi-meson nuclear transparency

Author

Hartmann, M., Kiselev, Yu. T., Polyanskiy, A., Paryev, E. Ya., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gebel, R., Hejny, V., Kaempfer, B., Keshelashvili, I., Koptev, V., Lorentz, B., Maeda, Y., Magas, V. K., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Roca, L., Schade, H., Serdyuk, V., Sibirtsev, A., Sinitsyna, V. Y., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Yu., Wilkin, C., Wuestner, P., and Ye, Q. J.

Subjects
Nuclear Experiment
Abstract

The production of phi mesons in proton collisions with C, Cu, Ag, and Au targets has been studied via the phi -> K+K- decay at an incident beam energy of 2.83 GeV using the ANKE detector system at COSY. For the first time, the momentum dependence of the nuclear transparency ratio, the in-medium phi width, and the differential cross section for phi meson production at forward angles have been determined for these targets over the momentum range of 0.6 - 1.6 GeV/c. There are indications of a significant momentum dependence in the value of the extracted phi width, which corresponds to an effective phi-N absorption cross section in the range of 14 - 21 mb., Comment: 9 pages, 5 figures

Published
2012
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50. Luminosity determination for the pd reaction at 2.14 GeV with WASA-at-COSY

Author

Zheng, C., Buescher, M., Fedorets, P., Hejny, V., Stroeher, H., Xu, H., and Yuan, X.

Subjects
Nuclear Experiment, Physics - Accelerator Physics
Abstract

The luminosity for a WASA-at-COSY experiment involving the pd reaction at 2.14 GeV proton-beam energy is determined by the forward pd elastic scattering, which yields an average beam-on-target value of [5.2\pm0.3(stat)\pm0.3(syst)]*10^{30} s^{-1}cm^{-2}. In addition, the forward pd elastic-scattering angular distribution is obtained with four-momentum transfer squared -t between 0.16 (GeV/c)^{2} and 0.78 (GeV/c)^{2} at this beam energy, which is compared with other experimental data and the pd double scattering model., Comment: 5 pages, 6 figures

Published
2011
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