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1. K+Λ(1405) photoproduction at the BGO-OD experiment

Author

Scheluchin Georg, Alef Stefan, Bauer Patrick, Beck Reinhard, Braghieri Alessandro, Cole Philip, Di Salvo Rachele, Elsner Daniel, Fantini Alessia, Freyermuth Oliver, Ghio Francesco, Gridnev Anatoly, Hammann Daniel, Hannappel Jürgen, Jude Thomas, Kohl Katrin, Kozlenko Nikolay, Lapik Alexander, Sandri Paolo Levi, Lisin Valery, Mandaglio Giuseppe, Messi Roberto, Moricciani Dario, Nedorezov Vladimir, Novinsky Dmitry, Pedroni Paolo, Polonski Andrei, Reitz Björn-Eric, Romaniuk Mariia, Schmieden Hartmut, Sumachev Victorin, Tarakanov Viacheslav, and Tillmanns Christian

Subjects
Physics, QC1-999
Abstract

Since the discovery of the Λ(1405), it remains poorly described by conventional constituent quark models, and it is a candidate for having an “exotic” meson-baryon or “penta-quark” structure, similar to states recently reported in the hidden charm sector. The Λ(1405) can be produced in the reaction γp K+Λ(1405). The pure I=0 decay mode into Σ0π0 is prohibited for the mass-overlapping Σ(1385). Combining a large aperture forward magnetic spectrometer and a central BGO crystal calorimeter, the BGO-OD experiment is ideally suited to measure this decay with the K+ in the forward direction. Preliminary results are presented. *Supported by DFG (PN 388979758, 405882627)

Published
2020
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2. Strangeness Photoproduction at the BGO-OD experiment

Author

Jude Thomas, Alef Stefan, Bauer Patrick, Beck Reinhard, Braghieri Alessandro, Cole Philip, Di Salvo Rachele, Elsner Daniel, Fantini Alessia, Freyermuth Oliver, Ghio Francesco, Gridnev Anatoly, Hammann Daniel, Hannappel Jürgen, Kohl Katrin, Kozlenko Nikolay, Lapik Alexander, Levi Sandri Paolo, Lisin Valery, Mandaglio Giuseppe, Messi Roberto, Moricciani Dario, Nedorezov Vladimir, Novinsky Dmitry, Pedroni Paolo, Polonski Andrei, Reitz Björn-Eric, Romaniuk Mariia, Scheluchin Georg, Schmieden Hartmut, Sumachev Victorin, Tarakanov Viacheslav, and Tillmanns Christian

Subjects
Physics, QC1-999
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating low momentum transfer processes due to the acceptance and high momentum resolution at forward angles. In particular, this enables the investigation of strangeness photoproduction where t-channel exchange mechanisms play an important role. This also allows access to low momentum exchange kinematics where extended, molecular structure may manifest in reaction mechanisms. First key results at low t indicate a cusp-like structure in K+Σ0 photoproduction at W = 1900 MeV, line shapes and differential cross sections for K+Λ(1405)→ K+Σ0π0, and a peak structure in K0SΣ0 photoproduction. The peak in the K0SΣ0 channel appears consistent with meson-baryon generated states, where equivalent models have been used to describe the PC pentaquark candidates in the heavy charmed quark sector.

Published
2020
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3. η’ beam asymmetry at threshold using the BGO-OD experiment

Author

Alef Stefan, Bauer Patrick, Beck Reinhard, Braghieri Alessandro, Cole Philip, Di Salvo Rachele, Elsner Daniel, Fantini Alessia, Freyermuth Oliver, Ghio Francesco, Gridnev Anatoly, Hammann Daniel, Hannappel Jürgen, Jude Thomas, Kohl Katrin, Kozlenko Nikolay, Lapik Alexander, Levi Sandri Paolo, Lisin Valery, Mandaglio Giuseppe, Messi Roberto, Moricciani Dario, Nedorezov Vladimir, Novinsky Dmitry, Pedroni Paolo, Polonski Andrei, Reitz Björn-Eric, Romaniuk Mariia, Scheluchin Georg, Schmieden Hartmut, Sumachev Victorin, Tarakanov Viacheslav, and Tillmanns Christian

Subjects
Physics, QC1-999
Abstract

The unexpected nodal structure of the beam asymmetry recently reported by the GRAAL collaboration in η′ photoproduction very close to threshold could be explained by a previously unobserved narrow resonance. The BGO-OD experiment is ideally suited to verify this measurement via the detection of forward going charged particles which in the threshold region of interest allows the identification of the reaction γp → η′ p solely based on the proton going in the forward direction. This yields unprecedented statistics if, in the missing mass analysis of the η′ meson, the background can be sufficiently well controlled. Preliminary results using a linearly polarised photon beam are shown. The reaction γp → η′ p was identified in the BGO forward spectrometer, with simulated data used to seperate signal and background.

Published
2020
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4. K0SΣ0 photoproduction at the BGO-OD experiment

Author

Kohl Katrin, Alef Stefan, Bauer Patrick, Beck Reinhard, Braghieri Alessandro, Cole Philip, Di Salvo Rachele, Elsner Daniel, Fantini Alessia, Freyermuth Oliver, Oliver Francesco, Gridnev Anatoly, Hammann Daniel, Hannappel Jürgen, Jude Thomas, Kozlenko Nikolay, Lapik Alexander, Levi Sandri Paolo, Lisin Valery, Mandaglio Giuseppe, Messi Roberto, Moricciani Dario, Nedorezov Vladimir, Novinsky Dmitry, Pedroni Paolo, Polonski Andrei, Reitz Björn-Eric, Romaniuk Mariia, Scheluchin Georg, Schmieden Hartmut, Sumachev Victorin, Tarakanov Viacheslav, and Tillmanns Christian

Subjects
Physics, QC1-999
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon via meson photoproduction. The setup with a BGO calorimeter surrounding the target and an open dipole spectrometer covering the for ward region is ideally suited for investigating low momentum transfer processes, in particular in strangeness photoproduction. The associated photoproduction of K0S and hyperons is essential to understand the role of K* exchange mech anisms. A cusp-like structure observed in the yp → K0SΣ+ reaction at the K* threshold is described by models including dynamically generated resonances from vector meson-baryon interactions. Such interactions are pre dicted to give a peak like structure in K0SΣ0 photoproduction off the neutron. A very preliminary cross section is determined and compared to the prediction, the results appear to support the model

Published
2020
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5. Strangeness photoproduction at the BGO-OD experiment

Author

Scheluchin, Georg, Alef, Stefan, Bauer, Patrick, Beck, Reinhard, Braghieri, Alessandro, Cole, Philip, Di Salvo, Rachele, Elsner, Daniel, Fantini, Alessia, Freyermuth, Oliver, Ghio, Francesco, Gridnev, Anatoly, Hammann, Daniel, Hannappel, Jürgen, Jude, Thomas, Kohl, Katrin, Kozlenko, Nikolay, Lapik, Alexander, Sandri, Paolo Levi, Lisin, Valery, Mandaglio, Giuseppe, Messi, Roberto, Moricciani, Dario, Nedorezov, Vladimir, Novinsky, Dmitry, Pedroni, Paolo, Polonski, Andrei, Reitz, Björn-Eric, Romaniuk, Mariia, Schmieden, Hartmut, Sumachev, Victorin, Tarakanov, Viacheslav, and Tillmanns, Christian

Subjects
Nuclear Experiment
Abstract

The BGO-OD experiment at the University of Bonn's ELSA accelerator facility in Germany is ideally suited to investigate photoproduction at extreme forward angles. It combines a highly segmented BGO electromagnetic calorimeter at central angles and an open dipole magnetic spectrometer in the forward direction. This allows the detection of forward going kaons, and complex final states of mixed charge from hyperon decays. Current projects at the BGO-OD experiment include strangeness production of $\gamma p \rightarrow K^+ \Lambda/\Sigma^0$ at forward angles, $K^0\Sigma^0$ with a deuteron target and $K^+\Lambda(1405)$ line shape and cross section measurements., Comment: Contribution to the proceedings of "HADRON2019: 18th International Conference on Hadron Spectroscopy and Structure", limited to 5 pages

Published
2020

6. $K^+\Lambda$(1405) photoproduction at the BGO-OD experiment

Author

Scheluchin, Georg, Alef, Stefan, Bauer, Patrick, Beck, Reinhard, Braghieri, Alessandro, Cole, Philip, Di Salvo, Rachele, Elsner, Daniel, Fantini, Alessia, Freyermuth, Oliver, Ghio, Francesco, Gridnev, Anatoly, Hammann, Daniel, Hannappel, Jürgen, Jude, Thomas, Kohl, Katrin, Kozlenko, Nikolay, Lapik, Alexander, Sandri, Paolo Levi, Lisin, Valery, Mandaglio, Giuseppe, Messi, Roberto, Moricciani, Dario, Nedorezov, Vladimir, Novinsky, Dmitry, Pedroni, Paolo, Polonski, Andrei, Reitz, Björn-Eric, Romaniuk, Mariia, Schmieden, Hartmut, Sumachev, Victorin, Tarakanov, Viacheslav, and Tillmanns, Christian

Subjects
Nuclear Experiment
Abstract

Since the discovery of the $\Lambda(1405)$, it remains poorly described by conventional constituent quark models, and it is a candidate for having an "exotic" meson-baryon or "penta-quark" structure, similar to states recently reported in the hidden charm sector. The $\Lambda(1405)$ can be produced in the reaction $\gamma p \rightarrow K^+\Lambda(1405)$. The pure I=0 decay mode into $\Sigma^0\pi^0$ is prohibited for the mass-overlapping $\Sigma(1385)$. Combining a large aperture forward magnetic spectrometer and a central BGO crystal calorimeter, the BGO-OD experiment is ideally suited to measure this decay with the $K^+$ in the forward direction. Preliminary results are presented. *Supported by DFG (PN 388979758, 405882627)., Comment: Contribution to the proceedings of "NSTAR2019: 12th International Workshop on the Physics of Excited Nucleons"

Published
2020

7. Information and Communication Technology as A Requirement for Successful Implementation of Education Managerial Functions

Author

Gridnev Anatoly Nikolaevich

Abstract

Working with information plays an important role in the management of any educational institution. The Deputy Director in carrying out information and analysis activities must process large amounts of material. The use of information technology helps make this job easier. This article describes the project on the use of information and communication technologies in the management of additional educational organizations for children and analyzes the main directions of informatization in the management of educational institutions. The effectiveness of the use of information technology in managerial activities based on the use of computer technology has been revealed. Managerial activities of the head include processing a large amount of information. For this information to really help make the right management decisions, it must be objective, arrive on time, and reflect the dynamics of change in management objects. In addition, we need technology that managers can use to process this information quickly and accurately, with minimal effort and time. However, in practice, a number of contradictions are revealed; between the need for computerized management of additional education centers and the ability of educational institutions the development management information systems; between the need to build a computerized management process based on scientific systems and their actual implementation through the development of individual areas - the constituent elements of the system (technical equipment, software, training, etc.), between the need to organize management using new information technologies and the level of training of teaching staff that is not adequate for working with modern software. The object of the study is ICT in the management activities of the leadership of an educational institution. The subject of the work is the process of informing the management of educational institutions. The aim of this work is to develop a variant of the management of educational institutions based on the use of information and communication technologies. This method of work. During the study, a complex of different methods was used: the object of research was studied by the method of systems analysis, the method of excluded and included observations, the study of documents governing the management of educational institutions, expert judgments, and sociological surveys. The practical significance of this work lies in the development of the project.

Published
2022
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8. A new Time-of-flight detector for the R$$^3$$B setup

Author

Heil, M., Kelić-Heil, A., Bott, L., Almusidi, T., Alvarez-Pol, H., Atar, L., Atkins, L., Aumann, T., Benlliure, J., Boretzky, K., Brückner, B., Cabanelas, P., Caesar, C., Casarejos, E., Cederkall, J., Chulkov, L., Corsi, A., Dueñas, J., Erbacher, P., Rodriguez, S. Escribano, Falduto, A., Feijoo, M., Frotscher, A., Frühauf, J., Gašparić, I., Borge, M. J. G., Gerbig, J., Gernhäuser, R., Gilbert, M., Glorius, J., Gnoffo, B., Göbel, K., Caamaño, D. Gonzalez, Grein, A., Hartig, A.-L., Heggen, H., Heine, M., Heinz, A., Holl, M., Homm, I., Horvat, A., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kamenyero, A., Khodaparast, A., Kiselev, O., Klenze, P., Knösel, M., Koch, K., Körper, D., Kröll, T., Kurtulgil, D., Kurz, N., Löher, B., Langer, C., Lehr, C., Litvinov, Y., Liu, H., Morales, S. Murillo, Nácher, E., Nilsson, T., Park, J., Paschalis, S., Pellegri, L., Perea, A., Petri, M., Pohl, T., Ponnath, L., Popočovski, R., Reifarth, R., Rhee, H.-B., Sanchez, J. L. Rodriguez, Rossi, D., Sürder, C., Sánchez-Benítez, A. M., Savran, D., Scheit, H., Simon, H., Slavkovská, Z., Storck-Dutine, S., Sun, Y., Törnqvist, H. T., Tanaka, J., Tengblad, O., Thomas, B., Varga, L., Volknandt, M., Wagner, V., Wamers, F., Zanetti, L., Aliotta, Marialuisa, Alkhazov, Georgy, Almusidi, Tahani, Alvarez-Pol, Hector, André, Paul, Assié, Marlène, Atar, Leyla, Atkins, Liam, Audouin, Laurent, Aumann, Thomas, Authelet, Gilles, Ayyad, Yassid, Bajzek, Martin, Barriere, Antoine, Beceiro-Novo, Saul, Belogurov, Sergey, Bemmerer, Daniel, Benlliure, Jose, Bertulani, Carlos, Bezbakh, Andrey, Blanchon, Guillaume, Boos, Carl Georg, Boretzky, Konstanze, Borge, Maria J., Borzov, Ivan, Bott, Lukas, Brückner, Benjamin, Cabanelas Eiras, Pablo, Caesar, Christoph, Calinescu, Stefana, Casarejos, Enrique, Catford, Wilton, Cederkall, Joakim, Chatillon, Audrey, Cherciu, Madalin Ilie, Chishti, M Majid Rauf, Chulkov, Leonid, Cirstian, Andreea, Corsi, Anna, Cortina-Gil, Dolores, Cravo, Edgar, Crespo, Raquel, Danilov, Andrey, de Angelis, Giacomo, De Filippo, Enrico, Diaz-Torres, Alexis, Dickel, Timo, Dobrovolsky, Alexander, Doornenbal, Pieter, Duer, Meytal, Egelhof, Peter, Elekes, Zoltan, Enders, Joachim, Erbacher, Philipp, Escribano Rodriguez, Sonia, Fahlander, Claes, Falduto, Ashton, Feijoo, Martina, Fernandez Ruiz, Daniel, Fomichev, Andrey, Fulop, Zsolt, Galaviz Redondo, Daniel, Galiana, Elisabet, García, Gabriel, García Távora, Vicente, Gasparic, Igor, Ge, Zhuang, Geissel, Hans, Geraci, Elena, Gerl, Jürgen, Gernhäuser, Roman, Gillibert, Alain, Glorius, Jan, Gnoffo, Brunilde, Göbel, Kathrin, Golovkov, Mikhail, Golovtsov, Victor, Golubev, Pavel, González Caamaño, David, Gorshkov, Alexander, Graña González, Antia, Gridnev, Anatoly, Gruzinskii, Nikolai, Guimaraes, Valdir, Harakeh, Muhsin N., Hartig, Anna-Lena, Heftrich, Tanja, Heggen, Henning, Heil, Michael, Heinz, Andreas, Hen, Or, Henrich, Corinna, Henriques, Ana, Hensel, Thomas, Holl, Matthias, Homm, Ilja, Horvat, Andrea, Horváth, Ákos, Hucka, Jan-Paul, Inglessi, Alexander, Jedele, Andrea, Jelavic Malenica, Desa, Jenegger, Tobias, Ji, Liancheng, Johansson, Håkan, Jonson, Björn, Jurado, Beatriz, Kahlbow, Julian, Kalantar-Nayestanaki, Nasser, Kamenyero, Armel, Kazantseva, Erika, Kelic-Heil, Aleksandra, Khanzadeev, Alexey, Kiselev, Oleg, Klenze, Philipp, Knyazev, Alexander, Koch, Karsten, Kogimtzis, Moschos, Kokubun, Kei, Korolev, Guerman, Körper, Daniel, Korsheninnikov, Alexey, Korten, Wolfram, Kozlenko, Nikolai, Krasilovskaja, Sabina, Kresan, Dmytro, Krivshich, Anatoly, Kröll, Thorsten, Krupko, Sergey, Kudaibergenova, Eleonora, Kunne Sohler, Dorottya, Kurtulgil, Deniz, Kurz, Nikolaus, Kuzmin, Evgeny, Kuznetsov, Viacheslav, Labiche, Marc, Lagni, Andrea, Langer, Christoph, Lányi, Zsombor, Lazarus, Ian, Le Fèvre, Arnaud, Leifels, Yvonne, Lepine-Szily, Alinka, Lewitowicz, Marek, Lihtar, Ivana, Linh, Bui, Litvinov, Yuri, Liu, Hongna, Löher, Bastian, Lommel, Bettina, Lorenz, Enis, Lukasik, Jerzy, Macchiavelli, Augusto, Maev, Evgeny, Maillertet, Charles, Maisuzenko, Dmitrii, Maj, Adam, Martorana, Nunzia Simona, Mauss, Benoît, Mayri, Christophe, Milhomens da Fonseca, Leandro, Morfouace, Pierre, Mozumdar, Nikhil, Mücher, Dennis, Murillo Morales, Silvia, Nacher, Enrique, Nikolskii, Evgenii, Nilsson, Thomas, Nociforo, Chiara, Nolden, Fritz, Nyman, Göran, Obertelli, Alexandre, Pagano, Emanuele Vincenzo, Panin, Valerii, Park, Joochun, Paschalis, Stefanos, Pei, Junchen, Perea, Angel, Petri, Marina, Piasetzky, Eli, Pietri, Stephane, Pirrone, Sara, Politi, Giuseppe, Pollacco, Emauel, Ponnath, Lukas, Potlog, Petru-Mihai, Prajapat, Rinku, Pritula, Roman, Qi, Hang, Rappold, Christophe, Reifarth, Rene, Revel, Aldric, Rhee, Han-Bum, Risitano, Fabio, Rodriguez Sanchez, Jose Luis, Rose, Luke, Rossi, Dominic, Rudigier, Matthias, Russotto, Paolo, Sánchez-Benítez, Ángel-Miguel, Sanjari, Shahab, Santamaria, Clementine, Sarantsev, Victor, Savran, Deniz, Scheidenberger, Christoph, Scheit, Heiko, Schmidt, Konrad, Simon, Haik, Simon, Johannes, Slavkovská, Zuzana, Slepnev, Roman, Sorlin, Olivier, Sousa, Tomás, Spiridon, Alexandra, Stan, Emil, Stanoiu, Mihai, Stefanescu, Alexandra, Stefanescu, Ionut, Storck-Dutine, Sonja, Stott, Aaron, Sun, Baohua, Sun, Yelei, Sürder, Christian, Taieb, Julien, Tanaka, Junki, Tanihata, Isao, Taniuchi, Ryo, Tengblad, Olof, Terekhin, Pavel, Teubig, Pamela, Törnqvist, Hans, Trache, Livius, Trautmann, Wolfgang, Trimarchi, Marina, Typel, Stefan, Uesaka, Tomohiro, Unsworth, Carl, Uvarov, Lev, Vandebrouck, Marine, Varga, Laszlo, Velardita, Simone, Velho, Paulo, Vencelj, Matjaz, Volknandt, Meiko, Volkov, Sergei, von Tresckow, Martin, Wagner, Andreas, Wamers, Felix, Wang, Yanzhao, Whitehead, Matthew, Wienholtz, Frank, Wimmer, Kathrin, Winkler, Martin, Xarepe, Manuel, Ye, Yanlin, Zacarias, Sabrina, Zamora Cardona, Juan Carlos, Zhang, Wei, Zhdanov, Andrei, Zhukov, Mikhail, Zilges, Andreas, Zuber, Kai, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), R3B, Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, Ministerio de Ciencia e Innovación (España), Xunta de Galicia, Agencia Estatal de Investigación (España), Swedish Research Council, Science and Technology Facilities Council (UK), Royal Society (UK), Projekt DEAL, Energy and Sustainability Research Institute Groni, and Nuclear Energy

Subjects
Nuclear and High Energy Physics, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Abstract

19 pags., 16 figs., 8 tabs., We present the design, prototype developments and test results of the new time-of-flight detector (ToFD) which is part of the R3B experimental setup at GSI and FAIR, Darmstadt, Germany. The ToFD detector is able to detect heavy-ion residues of all charges at relativistic energies with a relative energy precision σΔE/ ΔE of up to 1% and a time precision of up to 14 ps (sigma). Together with an elaborate particle-tracking system, the full identification of relativistic ions from hydrogen up to uranium in mass and nuclear charge is possible., This work received support from BMBF (05P19RFFN1, 05P15RDFN1, 05P19RDFN1) and HIC for FAIR. J.P. has been supported by the Institute for Basic Science (IBS-R031-D1). E.C. has been supported by the Ministry of Science and Innovation in Spain (PGC2018-099746-B-C22). J.L.R.S. thanks the support from the Regional Government of Galicia under the program of postdoctoral fellowships ED481B-2017-002 and ED481D-2021-018. O.T. has been supported by AEI/FEDER, UE project No. PID2019-104390GB-I00. G.B., A.H., H.T.J., B.J. and T.N. have been supported by the Swedish Research Council under contract 2017-03839. This work was supported by the Royal Society and UK STFC awards ST/L005727/1, ST/P003885/1.

Published
2022
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10. Strangeness photoproduction at the BGO-OD experiment

Author

Scheluchin, Georg, primary, Alef, Stefan, additional, Bauer, Patrick, additional, Beck, Reinhard, additional, Braghieri, Alessandro, additional, Cole, Philip, additional, Di Salvo, Rachele, additional, Elsner, Daniel, additional, Fantini, Alessia, additional, Freyermuth, Oliver, additional, Ghio, Francesco, additional, Gridnev, Anatoly, additional, Hammann, Daniel, additional, Hannappel, Jürgen, additional, Jude, Thomas, additional, Kohl, Katrin, additional, Kozlenko, Nikolay, additional, Lapik, Alexander, additional, Sandri, Paolo Levi, additional, Lisin, Valery, additional, Mandaglio, Giuseppe, additional, Messi, Roberto, additional, Moricciani, Dario, additional, Nedorezov, Vladimir, additional, Novinsky, Dmitry, additional, Pedroni, Paolo, additional, Polonski, Andrei, additional, Reitz, Björn-Eric, additional, Romaniuk, Mariia, additional, Schmieden, Hartmut, additional, Sumachev, Victorin, additional, Tarakanov, Viacheslav, additional, and Tillmanns, Christian, additional

Published
2020
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11. K+Λ(1405) photoproduction at the BGO-OD experiment.

Author

Beck, R., Thiel, A., Thoma, U., Wunderlich, Y., Scheluchin, Georg, Alef, Stefan, Bauer, Patrick, Beck, Reinhard, Braghieri, Alessandro, Cole, Philip, Di Salvo, Rachele, Elsner, Daniel, Fantini, Alessia, Freyermuth, Oliver, Ghio, Francesco, Gridnev, Anatoly, Hammann, Daniel, Hannappel, Jürgen, Jude, Thomas, and Kohl, Katrin

Subjects
QUARK models, MESONS, CALORIMETERS, OPTICAL apertures, SPECTROMETRY
Abstract

Since the discovery of the Λ(1405), it remains poorly described by conventional constituent quark models, and it is a candidate for having an "exotic" meson-baryon or "penta-quark" structure, similar to states recently reported in the hidden charm sector. The Λ(1405) can be produced in the reaction γp K+Λ(1405). The pure I=0 decay mode into Σ0π0 is prohibited for the mass-overlapping Σ(1385). Combining a large aperture forward magnetic spectrometer and a central BGO crystal calorimeter, the BGO-OD experiment is ideally suited to measure this decay with the K+ in the forward direction. Preliminary results are presented. *Supported by DFG (PN 388979758, 405882627) [ABSTRACT FROM AUTHOR]

Published
2020
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12. Strangeness Photoproduction at the BGO-OD experiment.

Author

Beck, R., Thiel, A., Thoma, U., Wunderlich, Y., Jude, Thomas, Alef, Stefan, Bauer, Patrick, Beck, Reinhard, Braghieri, Alessandro, Cole, Philip, Di Salvo, Rachele, Elsner, Daniel, Fantini, Alessia, Freyermuth, Oliver, Ghio, Francesco, Gridnev, Anatoly, Hammann, Daniel, Hannappel, Jürgen, Kohl, Katrin, and Kozlenko, Nikolay

Subjects
PHOTON beams, CALORIMETERS, MESONS, BARYONS, PENTAQUARK
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating low momentum transfer processes due to the acceptance and high momentum resolution at forward angles. In particular, this enables the investigation of strangeness photoproduction where t-channel exchange mechanisms play an important role. This also allows access to low momentum exchange kinematics where extended, molecular structure may manifest in reaction mechanisms. First key results at low t indicate a cusp-like structure in K+Σ0 photoproduction at W = 1900 MeV, line shapes and differential cross sections for K+Λ(1405)→ K+Σ0π0, and a peak structure in K0SΣ0 photoproduction. The peak in the K0SΣ0 channel appears consistent with meson-baryon generated states, where equivalent models have been used to describe the PC pentaquark candidates in the heavy charmed quark sector. [ABSTRACT FROM AUTHOR]

Published
2020
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13. K0SΣ0 photoproduction at the BGO-OD experiment.

Author

Beck, R., Thiel, A., Thoma, U., Wunderlich, Y., Kohl, Katrin, Alef, Stefan, Bauer, Patrick, Beck, Reinhard, Braghieri, Alessandro, Cole, Philip, Di Salvo, Rachele, Elsner, Daniel, Fantini, Alessia, Freyermuth, Oliver, Oliver, Francesco, Gridnev, Anatoly, Hammann, Daniel, Hannappel, Jürgen, Jude, Thomas, and Kozlenko, Nikolay

Subjects
EARLY Learning Skills Analysis, PHOTON beams, PARTICLES (Nuclear physics), CALORIMETERS, HYPERONS
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon via meson photoproduction. The setup with a BGO calorimeter surrounding the target and an open dipole spectrometer covering the for ward region is ideally suited for investigating low momentum transfer processes, in particular in strangeness photoproduction. The associated photoproduction of K0S and hyperons is essential to understand the role of K* exchange mech anisms. A cusp-like structure observed in the yp → K0SΣ+ reaction at the K* threshold is described by models including dynamically generated resonances from vector meson-baryon interactions. Such interactions are pre dicted to give a peak like structure in K0SΣ0 photoproduction off the neutron. A very preliminary cross section is determined and compared to the prediction, the results appear to support the model [ABSTRACT FROM AUTHOR]

Published
2020
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14. η' beam asymmetry at threshold using the BGO-OD experiment.

Author

Beck, R., Thiel, A., Thoma, U., Wunderlich, Y., Alef, Stefan, Bauer, Patrick, Beck, Reinhard, Braghieri, Alessandro, Cole, Philip, Di Salvo, Rachele, Elsner, Daniel, Fantini, Alessia, Freyermuth, Oliver, Ghio, Francesco, Gridnev, Anatoly, Hammann, Daniel, Hannappel, Jürgen, Jude, Thomas, Kohl, Katrin, and Kozlenko, Nikolay

Subjects
ATOMIC beams, PHOTON beams, PHOTONS, SPECTROMETRY, CHARGED particle accelerators
Abstract

The unexpected nodal structure of the beam asymmetry recently reported by the GRAAL collaboration in η′ photoproduction very close to threshold could be explained by a previously unobserved narrow resonance. The BGO-OD experiment is ideally suited to verify this measurement via the detection of forward going charged particles which in the threshold region of interest allows the identification of the reaction γp → η′ p solely based on the proton going in the forward direction. This yields unprecedented statistics if, in the missing mass analysis of the η′ meson, the background can be sufficiently well controlled. Preliminary results using a linearly polarised photon beam are shown. The reaction γp → η′ p was identified in the BGO forward spectrometer, with simulated data used to seperate signal and background. [ABSTRACT FROM AUTHOR]

Published
2020
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15. Experiment EPECUR for High Precision Measurements of the Pion Proton Cross Section in the Second Resonance Region

Author

Kalinkin, Dmitry Vasil’evich, primary, Alekseev, Igor Genadievich, additional, Andreev, Vladimir Anatolievich, additional, Bordyzhin, Igor Genadievich, additional, Filimonov, Evgeny Andreevich, additional, Golubev, Vyacheslav Vasil'evich, additional, Gridnev, Anatoly Borisovich, additional, Konovalova, Elena Aleksandrovna, additional, Koroleva, Lidia Ivanovna, additional, Kozlenko, Nikolay Georgievich, additional, Kozlov, Vladimir Sergeevich, additional, Krivshich, Anatoly Grigor'evich, additional, Kuznetsov, Vyacheslav Aleksandrovich, additional, Morozov, Boris Vladimirovich, additional, Nesterov, Vyacheslav Mikhailovich, additional, Novinsky, Dmitry Valer'evich, additional, Ryltsov, Vladislav Vladimirovich, additional, Sadler, Michael, additional, Shurigyn, Boris Mikhailovich, additional, Sulimov, Aleksandr Dmitrievich, additional, Sumachev, Viktorin Vladislavovich, additional, Svirida, Dimirty, additional, Tarakanov, Vyacheslav Ivanovich, additional, and Trautman, Vladimir Yur’evich, additional

Published
2014
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