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27 results on '"Johansson, Tord"'

1. 4D Track Reconstruction on Free-Streaming Data at PANDA at FAIR

Author

Taylor, Jenny, Papenbrock, Michael, Stockmanns, Tobias, Kliemt, Ralf, Johansson, Tord, Akram, Adeel, and Schönning, Karin

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

A new generation of experiments is being developed, where the challenge of separating rare signal processes from background at high intensities requires a change of trigger paradigm. At the future PANDA experiment at FAIR, hardware triggers will be abandoned and instead a purely software-based system will be used. This requires novel reconstruction methods with the ability to process data from many events simultaneously. A 4D tracking algorithm based on the cellular automaton has been developed which will utilize the timing information from detector signals. Simulation studies have been performed to test its performance on the foreseen free-streaming data from the PANDA detector. For this purpose, a quality assurance procedure for tracking on free-streaming data was implemented in the PANDA software. The studies show that at higher interaction rates, 4D tracking performs better than the 3D algorithm in terms of efficiency, 84% compared to 77%. The fake track suppression is also greatly improved, compared to the 3D tracking with roughly a 50% decrease in the ghost rate.

Published
2024

2. Vacuum Predictions and Measurements for an Internal Pellet Target

Author

Lehmann, Inti, Nordhage, Orjan, Friden, Carl-Johan, Norman, Gunar, Ekstrom, Curt, Johansson, Tord, and Wiedner, Ulrich

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment, Physics - Accelerator Physics
Abstract

Measurements with low Z targets at internal experiments typically imply a gas load which deteriorates the ring vacuum. Future experiments need reliable estimates for the expected vacuum conditions in order to design 4-pi detectors closely surrounding the interaction area. We present a method for the calculation of the resulting vacuum of such a complex system using a Pellet Target. In order to test the method, a vacuum system with diagnostic tools has been set up and a Pellet Target was operated under realistic conditions. The results for the absolute vacuum agree within factors of two with the expected pressures., Comment: 11 pages, 3 figures, submitted to Elsevier Vacuum

Published
2007
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3. String model description of polarisation and angular distributions in pbar p -> Lambdabar Lambda at low energies

Author

Pomp, Stephan, Ingelman, Gunnar, Johansson, Tord, and Ohlsson, Staffan

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

The observed polarisation of Lambda hyperons from the inclusive pA -> Lambda X reaction at high energies has previously been well described within the Lund string model through polarised ss quark pair production in the string breaking hadronisation process. This model is here applied to the exclusive pbar p -> Lambdabar Lambda reaction at low energies and compared to available data sets down to an incident beam momentum of 1.835 GeV/c. This required an extension of the diquark scattering model to involve three components: an isotropic part relevant close to threshold, a spectator part and a forward scattering part as in pA -> Lambda X at high energies. The observed angular distributions are then reproduced and, for momentum transfers above |t'| = 0.2 GeV^2, agreement with the measured polarisation is also obtained., Comment: 12 pages, 4 figures, submitted to Eur. Phys. J. A

Published
2002
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4. Hyperon signatures in the PANDA experiment at FAIR

Author

Abazov, Viktor, Abramov, Victor, Achenbach, Patrick, Afedulidis, Orestis, Ahrens, Lennart, Akram, Adeel, Al-Turany, Mohammad, Albrecht, Malte, Alexeev, Gennady, Ali, Ahmed, Alicke, Anna, Amsler, Claude, Antokhin, Evgeny, Appagere, Gandharva, Augustin, Ingo, Azizi, Kazem, Balanutsa, Pavel, Balashoff, Alexander, Barnyakov, Alexander Yu., Barucca, Gianni, Belias, Anastasios, Beloborodov, Konstantin, Bergert, Roman, Bianconi, Andrea, Bleser, Sebastian, Blinov, Alexander E., Blinov, Vladimir E., Bloms, Johannes, Boca, Gianluigi, Bodenschatz, Simon, Boelger, Niels, Böhm, Merlin, Böhm, Ralph, Bökelmann, Stephan, Bölting, Michael, Bonaventura, Daniel, Boukharov, Alexander, Bracco, Gianangelo, Bragadireanu, Mario, Brand, Philipp, Brinkmann, Kai-Thomas, Brück, Lisa, Bukharova, Marina, Bukreeva, Sofia, Bumrungkoh, Denchay, Bussa, Maria Pia, Calen, Hans, Calvo, Daniela, Capozza, Luigi, Caselle, Michele, Cederwall, Bo, Chauhan, Vinee, Chernetsky, Viacheslav, Chilingaryan, Suren, Coen, Sebastian, Corell, Oliver, Crede, Volker, Dav`ı, Fabrizio, de Boer, Remco, De Remigis, Paolo, Demekhin, Alexey, Denig, Achim, Denizli, Haluk, Deppe, Harald, Derichs, Artur, Diehl, Stefan, Dippel, Lara, Dobbs, Sean, Dodokhov, Valery Kh., Dolgolenko, Anatoly, Domagala, Mariusz, Monasterio, Maria Doncel, Dormenev, Valery, Dosdall, Rene, Dritschler, Timo, Duda, Daniel, Düren, Michael, Dzhygadlo, Roman, Efremov, Alexander, Eick, Hanna, Er, Nuray, Erlen, Thorsten, Erokhin, Alexandr, Esmail, Waleed, Eugenio, Paul, Eyrich, Wolfgang, Falk, Aniko, Fedorets, Pavel, Fedotov, Gleb, Feldbauer, Florian, Ferapontov, Valeri, Filippi, Alessandra, Filo, Grzegorz, Finger Jr, Michael, Finger, Miroslav, Fink, Mario, Firlej, Miroslaw, Fiutowski, Tomasz, Flemming, Holger, Frech, Jens, Frenkel, Celina Marie, Fritsch, Miriam, Galoyan, Aida, Gandhi, Keval, Gerasimov, Alexander, Gerhardt, Andreas, Giebenhain, Kim Tabea, Glaab, Daniel, Glazier, Derek, Glennemeier-Marke, Simon, Goldenbaum, Frank, Golovanov, Georgy, Golubev, Alexander, Goncharenko, Yury, Götzen, Klaus, Gou, Boxing, Gumbert, Katja, Hagdorn, Rene, Hahn, Christopher, Hammann, Christian, Hartmann, Jan, Heine, Greta, Heinsius, Fritz-Herbert, Heinz, Andreas, Held, Thomas, Herold, Christoph, Hetz, Benjamin, Himmelreich, Mathilde, Hoek, Matthias, Hofmann, Jan, Holtmann, Tobias, Hölzken, Fabian, Huang, Guang Shun, Idzik, Marek, Ireland, David, Jary, Vladimir, Jiang, Peiyong, Jiang, Zhu, Johansson, Tord, Kalita, Kushal, Kalugin, Nikita, Kannika, Jakapat, Kantsyrev, Alexey, Karabowicz, Radoslaw, Käser, Alexander, Kazlou, Dzmitry, Kegel, Sophie, Keshk, Iman, Kesik, Grazina, Keskin, Umut, Ketzer, Bernhard, Khalid, Faiza, Khoukaz, Alfons, Klasen, Roman, Kliemt, Ralf, Kobdaj, Chinorat, Koch, Helmut, Koch, Stefan, Kohlen, Jonas, Kononov, Sergey, Kopf, Bertram, Kopmann, Andreas, Korchak, Oleksandr, Korcyl, Grzegorz, Korcyl, Krzysztof, Korzhik, Mikhail, Kosinski, Tymoteusz, Kozak, Natalia, Krauss, Steffen, Kravchenko, Evgeniy A., Kripko, Aron, Kristi, Nikolai, Kunze, Marcel, Kupsc, Andrzej, Kurilla, Udo, Küßner, Meike, Kutuzov, Sergey, Kuyanov, Ivan A., Kveton, Antonin, Ladygina, Elena, Lalik, Rafal, Lancioni, Giovanni, Lattery, Mark, Lauth, Werner, Lebiedowicz, Piotr, Lehmann, Albert, Lehmann, Dorothee, Lehmann, Inti, Leithoff, Hans Heinrich, Levin, Andrei, Li, Jinxin, Liang, Yutie, Limphirat, Ayut, Linzen, Lukas, Lisowski, Edward, Liu, Beijiang, Liu, Chunxiu, Liu, Dong, Liu, Zhenan, Loehner, Herbert, Lucherini, Vincenzo, Lühning, Jost, Luschevskaya, Elena, Lynen, Uli, Maas, Frank, Maldaner, Stephan, Malige, Akshay, Malyshev, Oleg, Manaenkov, Sergey, Manasatitpong, Keerati, Mannweiler, Christian, Marciniewski, Pawel, Marcisovsky, Michal, Marton, Johann, Maslova, Eseniya, Matusiak, Michal, Matveev, Vladimir A., Mazza, Giovanni, Melnychuk, Dmytro, Mengucci, Paolo, Merkel, Harald, Messchendorp, Johan, Micha lek, Mateusz, Miehling, Daniel, Miklukho, Oleg, Minaev, Nikolay, Missevitch, Oleg, Mochalov, Vasiliy V., Moiseev, Vyacheslav, Molenda, Aleksandra, Montalto, Luigi, Moron, Jakub, Morozov, Dmitry, Motzko, Christof, Müller, Ulrich, Müllers, Johannes, Nasawad, Thanachot, Natali, Pier Paolo, Nerling, Frank, Nogach, Larisa, Noll, Oliver, Novikov, Konstantin, Novy, Josef, Nowakowski, Krzysztof, Olgun, Asiye Tugba, Orfanitski, Sergey, Orsich, Pavel, Orth, Herbert, Panjushkin, Vsevolod, Pankonin, Sven, Panyuschkina, Alena, Paone, Nicola, Papenbrock, Michael, Pelizäus, Marc, Peng, Hai Ping, Perez-Andrade, Gabriela, Peter, Marvin, Peters, Klaus, Petersen, Jannik, Piskun, Alexey A., Pivovarov, Sergey, Pochodzalla, Josef, Pongampai, Surachai, Poznanski, Piotr, Prasuhn, Dieter, Prochazka, Ivan, Przygoda, Witold, Pyata, Evgeniy, Pysz, Krzysztof, lazek, Joanna P., Qi, Hang, Quin, Jiajia, Rai, Ajay Kumar, Rathod, Narendra, Reeh, Andreas, Regina, Jenny, Reher, Jan, Reicherz, Gerhard, Rieger, Jana, Rigato, Valentino, Rinaldi, Daniele, Ritman, James, Rocco, Elena, Piñeiro, David Rodríguez, Rosner, Christoph, Ryazantsev, Andrey, Ryzhikov, Sergey, Sachs, Matthias, Salisbury, Ben, Samartsev, Alexander, Scalise, Lorenzo, Schadmand, Susan, Schäfer, Wolfgang, Schepers, Georg, Schlimme, Soeren, Schmidt, Christian Joachim, Schmidt, Christoph, Schmidt, Mustafa, Schmitt, Lars, Schnier, Claudius, Schönning, Karin, Schubert, René, Schupp, Falk, Schwarz, Carsten, Schwiening, Joachim, Sefzick, Thomas, Seifen, Tobias, Seitz, Bjoern, Semenov, Pavel A., Seth, Kam, Sfienti, Concettina, Shein, Igor, Shen, Xiaoyan, Shimanski, Stepan, Simantathammakul, Tawanchat, Skachkova, Anna N., Slunecka, Miloslav, Smyrski, Jerzy, Snoeyink, Mark, Sobol, Bartosz, Spataro, Stefano, Stavinskiy, Alexey Valentinovich, Steinacher, Michael, Steinen, Marcell, Stepanov, Vladimir, Stockmanns, Tobias, Straube, Marcel, Strickert, Marc, Strokovsky, Evgeny A., Sun, Shengsen, Sun, Yan Kun, Suzuki, Ken, Swientek, Krzysztof, Szczurek, Antoni, Takatsch, Chris N., Tarasiuk, Jerzy, Täschner, Alexander, Tavukoglu, Zeynep, Tegner, Per-Erik, Terlecki, Przemyslaw, Thoma, Ulrike, Tikhonov, Yury, Tokmenin, Valery, Tomasek, Lukas, Tomasi-Gustafsson, Egle, Traxler, Michael, Triffterer, Tobias, Tröll, Nils, Uzhinsky, Vladimir, Varentsov, Victor, Vasiliev, Alexander N., Veretennikov, Denis, Verkheev, Alexander, Vestrick, Sophia, Virius, Miroslav, Vishnevsky, Evgeny, Vodopianov, Alexander, Volf, Michal, Voss, Bernd, Wang, Fei, Wasem, Thomas, Watts, Daniel, Weidner, Frederik, Welde, Leonard, Wendlandt, Katharina, Wenzel, Christopher, Wettig, Vincent, Wieczorek, Peter, Wiedner, Ulrich, Wintz, Peter, Wolf, Yannic, Wolff, Sahra, Wolke, Magnus, Wongprachanukul, Narupon, Wronka, Slawomir, Xiao, Ting, Xu, Huagen, Yakutin, Alexander, Yerlikaya, Seda, Yilmaz, Ali, Yu, Chunxu, Zakrzewski, Tomasz, Zaunick, Hans-Georg, Zhang, Xiao, Zhao, Guang, Zhao, Jingzhou, Zhdanov, Andrey, Zheng, Bo, Zhou, Xiao Rong, Zhu, Wenjing, Zhuravlev, Nikolai I., Zimmermann, Iris, Ziyu, Zhang, and Zwieglinski, Boguslaw

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

We present a detailed simulation study of the signatures from the sequential decays of the triple-strange pbar p -> {\Omega}+{\Omega}- -> K+{\Lambda}barK- {\Lambda} -> K+pbar{\pi}+K-p{\pi}- process in the PANDA central tracking system with focus on hit patterns and precise time measurement. We present a systematic approach for studying physics channels at the detector level and develop input criteria for tracking algorithms and trigger lines. Finally, we study the beam momentum dependence on the reconstruction efficiency for the PANDA detector.

Published
2023
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5. PANDA Phase One

Author

Barucca, G., Akram, Adeel, Calén, Hans, Ikegami Andersson, Walter, Johansson, Tord, Kupsc, Andrzej, Marciniewski, Pawel, Papenbrock, Michael, Regina, Jenny, Rieger, Jana, Schönning, Karin, Wolke, Magnus, and Ryan, Sinead M.

Subjects
Subatomär fysik, Physics::Instrumentation and Detectors, Subatomic Physics, Acceleratorfysik och instrumentering, Nuclear Experiment, Accelerator Physics and Instrumentation
Abstract

The Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, provides unique possibilities for a new generation of hadron-, nuclear- and atomic physics experiments. The future antiProton ANnihilations at DArmstadt (PANDA or PANDA) experiment at FAIR will offer a broad physics programme, covering different aspects of the strong interaction. Understanding the latter in the non-perturbative regime remains one of the greatest challenges in contemporary physics. The antiproton-nucleon interaction studied with PANDA provides crucial tests in this area. Furthermore, the high-intensity, low-energy domain of PANDA allows for searches for physics beyond the Standard Model, e.g. through high precision symmetry tests. This paper takes into account a staged approach for the detector setup and for the delivered luminosity from the accelerator. The available detector setup at the time of the delivery of the first antiproton beams in the HESR storage ring is referred to as the Phase One setup. The physics programme that is achievable during Phase One is outlined in this paper. For complete list of authors see http://dx.doi.org/10.1140/epja/s10050-021-00475-y

Published
2021

6. Measurements of e(+) e(-) -> eta(c)pi(+)pi(-)pi(0), eta(c)pi(+)pi(-), and eta(c)pi(0)gamma at √s from 4.18 to 4.60 GeV, and search for a Z(c) state close to the D(D)over-bar threshold decaying to eta(c)pi at √s=4.23 GeV

Author

Ablikim, M., Adlarson, Patrik, Biernat, Jacek, Ikegami Andersson, Walter, Johansson, Tord, Kupsc, Andrzej, Pettersson, Joachim, Schönning, Karin, Thorén, Viktor, Wolke, Magnus, and Zou, J. H.

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

We study eta(c) production at center-of-mass energies root s from 4.18 to 4.60 GeV in e(+)e(-) annihilation data collected with the BESIII detector operating at the BEPCII storage ring, corresponding to 7.3 fb(-1) of integrated luminosity. We measure the cross sections of the three different exclusive reactions e(+)e(-) -> eta(c)pi(+)pi(-)pi(0), e(+)e(-) -> eta(c)pi(+)pi(-), and e(+)e(-) -> eta(c)pi(0)gamma. We find significant eta(c) production in e(+)e(-) -> eta(c)pi(+)pi(-)pi(0) at root s of 4.23 GeV and 4.26 GeV and observe a significant energy-dependent Born cross section that we measure to be consistent with the production via the intermediate Y(4260) resonance. In addition, we perform a search for a charmoniumlike Z(c) state close to the D (D) over bar threshold that decays to eta(c)pi, involving ground state charmonium, and observe no signal. Corresponding upper limits on the cross section of eta(c) and Z(c) production am provided, where the yields are not found to be significant. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.103.032006

Published
2021

7. Observation of a structure in e(+)e(-) -> phi eta ' at root s from 2.05 to 3.08 GeV

Author

Ablikim, M., Adlarson, Patrik, Biernat, Jacek, Ikegami Andersson, Walter, Johansson, Tord, Kupsc, Andrzej, Papenbrock, Michael, Pettersson, Joachim, Schönning, Karin, Thorén, Viktor, Wolke, Magnus, and Zou, J. H.

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

The process e(+)e(-) -> phi eta' has been studied for the first time in detail using data sample collected with the BESIII detector at the BEPCII collider at center of mass energies from 2.05 to 3.08 GeV. A resonance with quantum numbers J(PC) = 1(--) is observed with mass M = (2177.5 +/- 4.8(stat) +/- 19.5(syst))MeV/c(2) and width Gamma = (149.0 +/- 15.6(stat) +/- 8.9(syst)) MeV with a statistical significance larger than 10 sigma, including systematic uncertainties. If the observed structure is identified with the phi(2170), then the ratio of partial width between the phi eta' by BESIII and phi eta by BABAR is (B-phi eta(R)Gamma(R)(ee))1(B-phi eta'(R)Gamma(R)(ee)) = 0.23 +/- 0.10(stat) +/- 0.18(syst), which is smaller than the prediction of the s (s) over barg hybrid models by several orders of magnitude. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.102.012008

Published
2020

8. First Observation of D+ -> eta mu(+)nu(mu) and Measurement of Its Decay Dynamics

Author

Ablikim, M., Adlarson, Patrik, Biernat, Jacek, Ikegami Andersson, Walter, Johansson, Tord, Kupsc, Andrzej, Pettersson, Joachim, Schönning, Karin, Thorén, Viktor, Wolke, Magnus, and Zou, J. H.

Subjects
Subatomär fysik, Subatomic Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

By analyzing a data sample corresponding to an integrated luminosity of 2.93 fb(-1) collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we measure for the first time the absolute branching fraction of the D+ -> eta mu(+) nu(mu) decay to be BD+ ->eta mu+nu mu = (10.4 +/- 1.0(stat) +/- 0.5(syst)) x 10(-4). Using the world averaged value of BD+ ->eta e+nu e, the ratio of the two branching fractions is determined to be = BD+ ->eta mu+nu mu/BD+ ->eta e+nu e =0.91 +/- 0.13((stat+syst)), which agrees with the theoretical expectation of lepton flavor universality within uncertainty. By studying the differential decay rates in five four-momentum transfer intervals, we obtain the product of the hadronic form factor f(+)(eta)(0) and the c -> d Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cd vertical bar to be f(+)(eta)(0)vertical bar V-cd vertical bar = 0.087 +/- 0.008(stat) +/- 0.002(syst). Taking the input of vertical bar V-cd vertical bar from the global fit in the standard model, we determine f(+)(eta)(0) = 0.39 +/- 0.04(stat) +/- 0.01(syst). On the other hand, using the value of f(+)(eta)(0) calculated in theory, we find vertical bar V-cd vertical bar= 0.242 +/- 0.022(stat )+/- 0.006(syst) +/- 0.033(theory). For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.124.231801

Published
2020

9. Search for η mesic 3He with the WASA-at-COSY facility in the pd -> 3He2γ and pd -> 3He6γ reaction

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bass, S. D., Berlowski, M., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Czerwinski, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell, Goldenbaum, F., Goswami, A., Grigoryev, K., Heijkenskjöld, Lena, Hejny, V., Hirenzaki, S., Jarczyk, L., Johansson, Tord, Kamys, B., Kelkar, N. G., Kemmerling, G., Khreptak, A., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., Morsch, H. -P, Moskal, P., Ohm, H., Parol, W., del Rio, E. Perez, Piskunov, N. M., Prasuhn, D., Pszczel, Damian, Pysz, K., Ritman, J., Roy, A., Rundel, O., Sawant, S., Schadmand, S., Schatti-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., Stroeher, H., Szczurek, A., Trzcinski, A., Wolke, Magnus, Wronska, A., Wuestner, P., Yamamoto, A., Zabierowski, J., Zielinski, M. J., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.

Subjects
Subatomär fysik, Nuclear Theory, Subatomic Physics, eta-meson, High Energy Physics::Experiment, Nuclear Experiment, eta-mesic nuclei
Abstract

We report on the experimental search for the bound state of an eta meson and He-3 nucleus performed using the WASA-at-COSY detector setup. In order to search for the eta-mesic nucleus decay, the pd -> (3)He2(gamma) and pd -> (3)He6 gamma channels have been analysed. These reactions manifest the direct decay of the ti meson bound in a He-3 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 a He-3-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 He-3 nucleus formation followed by the eta meson decay which varies between 2 nb and 15 nb depending on possible bound state parameters.

Published
2020

10. Observation and study of the decay J/psi -> phi eta eta '

Author

Ablikim, M., Ikegami Andersson, Walter, Johansson, Tord, Kupsc, Andrzej, Li, Cui, Papenbrock, Michael, Pettersson, Joachim, Schönning, Karin, Wolke, Magnus, and Zou, J. H.

Subjects
Subatomär fysik, Subatomic Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We report the observation and study of the decay J/psi -> phi eta eta' phi eta eta' using 1.3 x 10(9) J/psi events collected with the BESIII detector. Its branching fraction, including all possible intermediate states, is measured to be (2.32 +/- 0.06 +/- 0.16) x 10(-4). We also report evidence for a structure, denoted as X, in the phi eta' mass spectrum in the 2.0-2.1 GeV/c(2) region. Using two decay modes of the eta' meson (gamma pi(+)pi(-) and eta pi(+)pi(-)), a simultaneous fit to the Ore mass spectra is performed. Assuming the quantum numbers of the X to be J(P) = 1(-), its significance is found to be 4.4 sigma, with a mass and width of (2002.1 +/- 27.5 +/- 21.4) MeV/c(2) and (129 +/- 17 +/- 9) MeV, respectively, and a product branching fraction B(J/psi -> eta X) x B(X -> phi eta') = (9.8 +/- 1.2 +/- 1.7) x 10(-5). Alternatively, assuming J(P) = 1(+), the significance is 3.8 sigma, with a mass and width of (2062.8 +/- 13.1 +/- 7.2) MeV/c(2) and (177 +/- 36 +/- 35) MeV, respectively, and a product branching fraction B(J/psi -> eta X)x B(X -> phi eta') = (9.6 +/- 1.4 +/- 2.0) x 10(-5). The angular distribution of J/psi -> eta X is studied and the two J(P) assumptions of the X cannot be clearly distinguished due to the limited statistics. In all measurements the first uncertainties are statistical and the second systematic. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.112008

Published
2019

11. Determination of the Pseudoscalar Decay Constant f(Ds)(+) via D-s(+) -> mu(+)nu(mu)

Author

Ablikim, M., Andersson, Walter Ikegami, Johansson, Tord, Kupsc, Andrzej, Li, Cui, Papenbrock, Michael, Pettersson, Joachim, Schönning, Karin, Wolke, Magnus, and Zou, J. H.

Subjects
Subatomär fysik, High Energy Physics::Phenomenology, Subatomic Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Using a 3.19 fb(-1) data sample collected at an e(+)e(-) center-of-mass energy of E-cm = 4.178 GeV with the BESIII detector, we measure the branching fraction of the leptonic decay D-s(+) -> mu(+)nu(mu) to be BDs+ -> mu+nu mu = (5.49 +/- 0.16(stat) +/- 0.15(syst)) x 10(-3). Combining our branching fraction with the masses of the D-s(+) and mu(+) and the lifetime of the D-s(+), we determine f(Ds+)vertical bar V-cs vertical bar = 246.2 +/- 3.6(stat) +/- 3.5(syst) MeV. Using the c -> s quark mixing matrix element vertical bar V-cs vertical bar determined from a global standard model fit, we evaluate the D-s(+) decay constant f(Ds+) = 252.9 +/- 3.7(stat) +/- 3.6(syst) MeV. Alternatively, using the value of f(Ds+) calculated by lattice quantum chromodynamics, we find vertical bar V-cs vertical bar = 0.985 +/- 0.014(stat) +/- 0.014(syst). These values of BDs+ -> mu+nu mu, f(Ds+)vertical bar V-cs vertical bar, f(Ds+) and vertical bar V-cs vertical bar are each the most precise results to date. For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.122.071802

Published
2019

12. Technical design report for the (P)over-barANDA Barrel DIRC detector

Author

Singh, B., Calén, Hans, Andersson, Walter Ikegami, Johansson, Tord, Kupsc, Andrzej, Marciniewski, Pawel, Papenbrock, Michael, Pettersson, Joachim, Schönning, Karin, Wolke, Magnus, Gålnander, Björn, and Zmeskal, J.

Subjects
Subatomär fysik, PANDA experiment, hadron physics, Subatomic Physics, High Energy Physics::Experiment, ring imaging Cherenkov detector, Nuclear Experiment, particle identification, DIRC counter
Abstract

The (P) over bar ANDA (anti-Proton ANnihiliation at DArmstadt) experiment will be one of the four flagship experiments at the new international accelerator complex FAIR (Facility for Antiproton and Ion Research) in Darmstadt, Germany. (P) over bar ANDA will address fundamental questions of hadron physics and quantum chromodynamics using high-intensity cooled antiproton beams with momenta between 1.5 and 15 GeV/c and a design luminosity of up to 2 x 10(32) cm(-2) S-1. Excellent particle identification (PID) is crucial to the success of the (P) over bar ANDA physics program. Hadronic PID in the barrel region of the target spectrometer will be performed by a fast and compact Cherenkov counter using the detection of internally reflected Cherenkov light (DIRC) technology. It is designed to cover the polar angle range from 22 degrees to 140 degrees and will provide at least 3 standard deviations (s.d.) pi/K separation up to 3.5 GeV/c, matching the expected upper limit of the final state kaon momentum distribution from simulation. This documents describes the technical design and the expected performance of the (P) over bar ANDA Barrel DIRC detector. The design is based on the successful BaBar DIRC with several key improvements. The performance and system cost were optimized in detailed detector simulations and validated with full system prototypes using particle beams at GSI and CERN. The final design meets or exceeds the PID goal of clean pi/K separation with at least 3 s.d. over the entire phase space of charged kaons in the Barrel DIRC. For complete list of authors see http://dx.doi.org/10.1088/1361-6471/aade3d

Published
2019

13. Measurements of weak decay asymmetries of Lambda(+)(c) -> pK(S)(0), Lambda pi(+), Sigma(+)pi(0), and Sigma(0)pi(+)

Author

Ablikim, M., Adlarson, Patrik, Biernat, Jacek, Ikegami Andersson, Walter, Johansson, Tord, Kupsc, Andrzej, Li, Cui, Papenbrock, Michael, Pettersson, Joachim, Schönning, Karin, Thorén, Viktor, Wolke, Magnus, and Zou, J. H.

Subjects
Subatomär fysik, Subatomic Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Using e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (-)(c). production from a 567 pb(-1) data sample collected by BESIII at 4.6 GeV, a full angular analysis is carried out simultaneously on the four decay modes of Lambda(+)(c) -> pK(S)(0), Lambda pi(+), Sigma(+)pi(0), and Sigma(0)pi(+). For the first time, the Lambda(+)(c) transverse polarization is studied in unpolarized e(+)e(-) collisions, where a nonzero effect is observed with a statistical significance of 2.1 sigma. The decay asymmetry parameters of the Lambda(+)(c) weak hadronic decays into pK(S)(0), Lambda pi(+), Sigma(+)pi(0), and Sigma(0)pi(+) are measured to be 0.18 +/- 0.43(stat) +/- 0.14(syst), -0.80 +/- 0.11(stat) +/- 0.02(syst), -0.57 +/- 0.10(stat) +/- 0.07(syst), and -0.73 +/- 0.17(stat) +/- 0.07(syst), respectively. In comparison with previous results, the measurements for the Lambda pi(+) and Sigma(+)pi(0) modes are consistent but with improved precision, while the parameters for the pK(S)(0) and Sigma(+)pi(0) modes are measured for the first time. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.100.072004

Published
2019

14. Measurement of the absolute branching fractions of Lambda(+)(c) -> Lambda eta pi(+) and Sigma(1385) (+) eta

Author

Ablikim, M., Andersson, Walter Ikegami, Johansson, Tord, Kupsc, Andrzej, Li, Cui, Papenbrock, Michael, Pettersson, Joachim, Schönning, Karin, Wolke, Magnus, and Zou, J. H.

Subjects
Subatomär fysik, Subatomic Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We study the decays Lambda(+)(c) -> Lambda eta pi(+) and Sigma(1385)(+)eta based on Lambda(+)(c)(Lambda) over bar (c) pairs produced in e(+)e(-) collisions at a center-of-mass energy of root s = 4.6 GeV, corresponding to an integrated luminosity of 567 pb(-1). The data sample was accumulated with the BESIII detector at the BEPCII collider. The branching fractions are measured to be beta(Lambda(+)(c) -> Lambda eta pi(+)) = (1.84 +/- 0.21 (stat) +/- 0.15(syst))% and B(Lambda(+)(c) -> Sigma(1385)(+) eta) = (0.91 +/- 0.18 (stat) +/- 0.09 (syst))%, constituting the most precise measurements to date. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.032010

Published
2019

15. Observation of e(+) e(-) -> eta Y(2175) at center-of-mass energies above 3.7 GeV

Author

Ablikim, M., Andersson, Walter Ikegami, Johansson, Tord, Kupsc, Andrzej, Li, Cui, Papenbrock, Michael, Pettersson, Joachim, Schönning, Karin, Wolke, Magnus, and Zou, J. H.

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

The state Y(2175) is observed in the process e(+)e(-) -> eta Y(2175) with a statistical significance larger than 10 standard deviations using the data collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies between 3.7 and 4.6 GeV. This is the first observation of the Y(2175) in this process. The mass and width of the Y(2175) are determined to be (2135 +/- 8 +/- 9) MeV/e(2) and (104 +/- 24 +/- 12) MeV, respectively, and the production cross section (sigma) of e(+)e(-) -> eta Y(2175) -> eta phi f(0)(980) -> eta phi pi(+)pi(-) is at the several hundred femtobarn level. No significant signal for the process e(+)e(-) -> eta'Y(2175) is observed and the upper limit on sigma(e(+)e(-) -> eta'Y(2175))/sigma(e(+)e(-) -> eta Y(2175)) is estimated to be 0.43 at the 90% confidence level. We also search for psi(3686) -> eta Y(2175). No significant signal is observed, indicating a strong suppression relative to the corresponding J/psi decay, in violation of the "129% rule". For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.012014

Published
2019

16. Study of the Dalitz decay J/psi -> e(+)e(-)eta

Author

Ablikim, M., Andersson, Walter Ikegami, Johansson, Tord, Kupsc, Andrzej, Li, Cui, Papenbrock, Michael, Pettersson, Joachim, Schönning, Karin, Wolke, Magnus, and Zou, J. H.

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

We study the electromagnetic Dalitz decay J/psi -> e(+)e(-)eta and search for dielectron decays of a dark gauge boson (gamma') in J/psi -> gamma'eta with the two q decay modes eta -> gamma gamma and eta -> pi(+)pi(-)pi(0) using (1310.6 +/- 7.0) x 10(6) J/psi events collected with the BESIII detector. The branching fraction of J/psi -> e(+)e(-)eta is measured to be (1.43 +/- 0.04(stat) +/- 0.06(syst)) x 10(-5), with a precision that is improved by a factor of 1.5 over the previous BESIII measurement. The corresponding dielectron invariant mass dependent modulus square of the transition form factor is explored for the first time, and the pole mass is determined to be Lambda = 2.84 +/- 0.11(stat) +/- 0.08(syst) GeV/c(2). We find no evidence of gamma' production and set 90% confidence level upper limits on the product branching fraction B(J/psi -> gamma'eta) x B(gamma' -> e(+)e(-)) as well as the kinetic mixing strength between the standard model photon and gamma' in the mass range of 0.01 For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.99.012006

Published
2019

17. Measurement of the Dynamics of the Decays D-s(+ )-> eta(('))e(+)nu(e)

Author

Ablikim, M., Andersson, Walter Ikegami, Johansson, Tord, Kupsc, Andrzej, Li, Cui, Papenbrock, Michael, Pettersson, Joachim, Schönning, Karin, Wolke, Magnus, and Zou, J. H.

Subjects
Subatomär fysik, High Energy Physics::Phenomenology, Subatomic Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Using e(+)e(-) annihilation data corresponding to an integrated luminosity of 3.19 fb(-1) collected at a center-of-mass energy of 4.178 GeV with the BESIII detector, we measure the absolute branching fractions BDs+->eta e+nu e = (2.323 +/- 0.063(stat) +/- 0.063(syst))% and BDs+->eta'e+nu e = (0.824 +/- 0.073(stat) +/- 0.027(syst))% via a tagged analysis technique, where one D-s is fully reconstructed in a hadronic mode. Combining these measurements with previous BESIII measurements of B-D+->eta(')e+(nu e),the eta - eta' mixing angle in the quark flavor basis is determined to be phi(P) = (40.1 +/- 2.1(stat) +/- 0.7(syst))degrees. From the first measurements of the dynamics of Ds+ -> eta(')e(+)nu(e) decays, the products of the hadronic form factors f(+)(eta('))(0) and the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cs vertical bar are determined with different form factor parametrizations. For the two-parameter series expansion, the results are f(+)(eta) (0) vertical bar V-cs vertical bar = 0.4455 +/- 0.0053(stat) +/- 0.0044(syst) and f(+)(eta)' (0) vertical bar V-cs vertical bar and = 0.477 +/- 0.049(stat) +/- 0.011(syst). For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.122.121801

Published
2019

18. Search for the decay eta ' -> gamma gamma eta (Search for the decay η′→γγη)

Author

Ablikim, M., Adlarson, Patrik, Biernat, Jacek, Ikegami Andersson, Walter, Johansson, Tord, Kupsc, Andrzej, Li, Cui, Papenbrock, Michael, Pettersson, J., Schönning, Karin, Thorén, Viktor, Wolke, Magnus, and Zou, J. H.

Subjects
Subatomär fysik, Astrophysics::High Energy Astrophysical Phenomena, Subatomic Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Using a data sample of 1.31 x 10(9) J/psi events collected with the BESIII detector, a search for eta' -> gamma gamma eta via J/psi ->gamma eta' is performed for the first time. No significant eta' signal is observed in the gamma gamma eta invariant mass spectrum, and the branching fraction of eta' -> gamma gamma eta is determined to be less than 1.33 x 10(-4) at the 90% confidence level. For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.100.052015

Published
2019

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

Author

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

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

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

Published
2018

20. Observation of psi(3686) -> eta ' e(+)e(-)

Author

Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Alekseev, M., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Bai, Y., Bakina, O., Ferroli, R. Baldini, Ban, Y., Begzsuren, K., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, P. L., Chen, S. J., Chen, X. R., Chen, Y. B., Cheng, W., Chu, X. K., Cibinetto, G., Cossio, F., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dou, Z. L., Du, S. X., Duan, P. F., Fang, J., Fang, S. S., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garillon, B., Garzia, I., Gilman, A., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, Y. T., Guo, A. Q., Guo, R. P., Guo, Y. P., Guskov, A., Haddadi, Z., Han, S., Hao, X. Q., Harris, F. A., He, K. L., He, X. Q., Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, H. M., Hu, J. F., Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Huang, X. T., Huang, X. Z., Huang, Z. L., Hussain, T., Andersson, Walter Ikegami, Irshad, M., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Jin, Y., Johansson, Tord, Julin, A., Kalantar-Nayestanaki, N., Kang, X. S., Kavatsyuk, M., Ke, B. C., Khan, T., Khoukaz, A., Kiese, P., Kiuchi, R., Kliemt, R., Koch, L., Kolcu, O. B., Kopf, B., Kornicer, M., Kuemmel, M., Kuessner, M., Kupsc, Andrzej, Kurth, M., Kuhn, W., Lange, J. S., Lara, M., Larin, P., Lavezzi, L., Leithoff, H., Li, Cui, Li, Cheng, Li, D. M., Li, F., Li, F. Y., Li, G., Li, H. B., Li, H. J., Li, J. C., Li, J. W., Li, Jin, Li, K. J., Li, Kang, Li, Ke, Li, Lei, Li, P. L., Li, P. R., Li, Q. Y., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Z. B., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Liao, L. Z., Libby, J., Lin, C. X., Lin, D. X., Liu, B., Liu, B. J., Liu, C. X., Liu, D., Liu, D. Y., Liu, F. H., Liu, Fang, Liu, Feng, Liu, H. B., Liu, H. L., Liu, H. M., Liu, Huanhuan, Liu, Huihui, Liu, J. B., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L. D., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Z. A., Liu, Zhiqing, Long, Y. F., Lou, X. C., Lu, H. J., Lu, J. G., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, X. L., Lusso, S., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, T., Ma, X. N., Ma, X. Y., Ma, Y. M., Maas, F. E., Maggiora, M., Malik, Q. A., Mangoni, A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Min, J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales, C. Morales, Muchnoi, N. Yu., Muramatsu, H., Mustafa, A., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Papenbrock, Michael, Patteri, P., Pelizaeus, M., Pellegrino, J., Peng, H. P., Peng, Z. Y., Peters, K., Pettersson, Joachim, Ping, J. L., Ping, R. G., Pitka, A., Poling, R., Prasad, V., Qi, H. R., Qi, M., Qi, T. Y., Qian, S., Qiao, C. F., Qin, N., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Richter, M., Ripka, M., Rivetti, A., Rolo, M., Rong, G., Rosner, Ch., Sarantsev, A., Savrie, M., Schnier, C., Schönning, Karin, Shan, W., Shan, X. Y., Shao, M., Shen, C. P., Shen, P. X., Shen, X. Y., Sheng, H. Y., Shi, X., Song, J. J., Song, W. M., Song, X. Y., Sosio, S., Sowa, C., Spataro, S., Sun, G. X., Sun, J. F., Sun, L., Sun, S. S., Sun, X. H., Sun, Y. J., Sun, Y. K., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tan, Y. T., Tang, C. J., Tang, G. Y., Tang, X., Tapan, I., Tiemens, M., Tsednee, B., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, Dan, Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, Meng, Wang, P., Wang, P. L., Wang, W. P., Wang, X. F., Wang, Y., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. Y., Wang, Zongyuan, Weber, T., Wei, D. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, Magnus, Wu, L. H., Wu, L. J., Wu, Z., Xia, L., Xia, Y., Xiao, D., Xiao, Y. J., Xiao, Z. J., Xie, Y. G., Xie, Y. H., Xiong, X. A., Xiu, Q. L., Xu, G. F., Xu, J. J., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, F., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y. H., Yang, Y. X., Yang, Yifan, Yang, Z. Q., Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, J. S., Yuan, C. Z., Yuan, Y., Yuncu, A., Zafar, A. A., Zeng, Y., Zeng, Z., Zhang, B. X., Zhang, B. Y., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, K., Zhang, L., Zhang, T. J., Zhang, X. Y., Zhang, Y., Zhang, Y. H., Zhang, Y. T., Zhang, Yang, Zhang, Yao, Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, Q., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhou, Xiaoyu, Zhou, Xu, Zhu, A. N., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zou, B. S., and Zou, J. H.

Subjects
Dalitz decay, Subatomär fysik, e(+)e(-) Annihilation, Subatomic Physics, BESIII, High Energy Physics::Experiment, Nuclear Experiment, Charmonium
Abstract

Using a data sample of 448.1 x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay psi(3686) -> eta'e(+)e(-), with significances of 7.0 sigma and 6.3 sigma when reconstructing the eta' meson via its decay modes eta' -> gamma pi(+)pi(-) and eta' -> pi(+)pi(-) eta (eta -> gamma gamma), respectively. The weighted average branching fraction is determined to be B(psi(3686) -> eta'e(+)e(-)) = (1.90 +/- 0.25 +/- 0.11) x 10(-6), where the first uncertainty is statistical and the second systematic.

Published
2018

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

Author

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

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

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

Published
2018

22. Measurements of the branching fractions for the semileptonic decays D-s(+) -> phi e(+)v(e), phi mu(+)v(mu), eta mu(+)v(mu) and eta 'mu(+)v(mu)

Author

Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Bai, Y., Bakina, O., Ferroli, R. Baldini, Ban, Y., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chu, X. K., Cibinetto, G., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dorjkhaidav, O., Dou, Z. L., Du, S. X., Duan, P. F., Fang, J., Fang, S. S., Fang, X., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garzia, I., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, S., Gu, Y. T., Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Haddadi, Z., Han, S., Hao, X. Q., Harris, F. A., He, K. L., He, X. Q., Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, C., Hu, H. M., Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Huang, X. T., Huang, X. Z., Huang, Z. L., Hussain, T., Ikegami Andersson, Walter, Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Jin, Y., Johansson, Tord, Julin, A., Kalantar-Nayestanaki, N., Kang, X. L., Kang, X. S., Kavatsyuk, M., Ke, B. C., Khan, T., Khoukaz, A., Kiese, P., Kliemt, R., Koch, L., Kolcu, O. B., Kopf, B., Kornicer, M., Kuemmel, M., Kuhlmann, M., Kupsc, Andrzej, Kuehn, W., Lange, J. S., Lara, M., Larin, P., Lavezzi, L., Leithoff, H., Leng, C., Li, C., Li, Cheng, Li, D. M., Li, F., Li, F. Y., Li, G., Li, H. B., Li, H. J., Li, J. C., Li, Jin, Li, K., Li, K. J., Li, Lei, Li, P. L., Li, P. R., Li, Q. Y., Li, T., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Z. B., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Lin, D. X., Liu, B., Liu, B. J., Liu, C. X., Liu, D., Liu, F. H., Liu, Fang, Liu, Feng, Liu, H. B., Liu, H. H., Liu, H. M., Liu, J. B., Liu, J. P., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L. D., Liu, P. L., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Z. A., Liu, Zhiqing, Long, Y. F., Lou, X. C., Lu, H. J., Lu, J. G., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, X. L., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, T., Ma, X. N., Ma, X. Y., Ma, Y. M., Maas, F. E., Maggiora, M., Magnoni, A. S., Malik, Q. A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Min, J., Min, T. J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales, C. Morales, Morello, G., Muchnoi, N. Yu., Muramatsu, H., Musiol, P., Mustafa, A., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Papenbrock, Michael, Patteri, P., Pelizaeus, M., Pellegrino, J., Peng, H. P., Peters, K., Pettersson, Joachim, Ping, J. L., Ping, R. G., Poling, R., Prasad, V., Qi, H. R., Qi, M., Qian, S., Qiao, C. F., Qin, N., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Richter, M., Ripka, M., Rolo, M., Rong, G., Rosner, Ch., Ruan, X. D., Sarantsev, A., Savrie, M., Schnier, C., Schoenning, Karin, Shan, W., Shao, M., Shen, C. P., Shen, P. X., Shen, X. Y., Sheng, H. Y., Song, J. J., Song, W. M., Song, X. Y., Sosio, S., Sowa, C., Spataro, S., Sun, G. X., Sun, J. F., Sun, L., Sun, S. S., Sun, X. H., Sun, Y. J., Sun, Y. K., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tang, C. J., Tang, G. Y., Tang, X., Tapan, I., Tiemens, M., Tsednee, B. T., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, Dan, Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, P., Wang, P. L., Wang, W. P., Wang, X. F., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. H., Wang, Z. Y., Weber, T., Wei, D. H., Wei, J. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, Magnus, Wu, L. H., Wu, L. J., Wu, Z., Xia, L., Xia, Y., Xiao, D., Xiao, H., Xiao, Y. J., Xiao, Z. J., Xie, Y. G., Xie, Y. H., Xiong, X. A., Xiu, Q. L., Xu, G. F., Xu, J. J., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y. H., Yang, Y. X., Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, J. S., Yuan, C. Z., Yuan, Y., Yuncu, A., Zafar, A. A., Zeng, Y., Zeng, Z., Zhang, B. X., Zhang, B. Y., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, K., Zhang, L., Zhang, S. Q., Zhang, X. Y., Zhang, Y., Zhang, Y. H., Zhang, Y. T., Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, W. J., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhou, Y. X., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zou, B. S., and Zou, J. H.

Subjects
Astronomi, astrofysik och kosmologi, Astronomy, Astrophysics and Cosmology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

By analyzing 482 pb(-1) of e(+) e(-) collision data collected at the center-of-mass energy root s = 4.009 GeV with the BESIII detector, we measure the branching fractions for the semi-leptonic decays D-s(+) -> phi e(+)v(e), phi mu(+)v(mu), eta mu(+)v(mu) and eta'mu(+)v(mu) to be B(D-s(+) -> phi e(+)v(e)) = (2.26 +/- 0.45 +/- 0.09)%, B(D-s(+) -> phi mu+v(mu)) = (1.94 +/- 0.53 +/- 0.09)%, B(D-s(+) -> eta mu(+)v(mu)) = (2.42 +/- 0.46 +/- 011)% and B(D-s(+) -> eta'mu(+)v(mu)) = (1.06 +/- 0.54 +/- 0.07)%, where the first and second uncertainties are statistical and systematic, respectively. The branching fractions for the three semi-muonic decays D-s(+) -> phi mu(+)v(mu), eta mu(+)v(mu) and eta'mu(+)v(mu) are determined for the first time and that of D-s(+) -> phi e(+)v(e) is consistent with the world average value within uncertainties.

Published
2018

23. Measurements of the branching fractions of the singly Cabibbo-suppressed decays D0 →ωη, η (′)π0 and η (′)η

Author

Ablikim, M., Achasov, M. N., Ahmed, S., Albayrak, O., Albrecht, M., Ambrose, D. J., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Bakina, O., Ferroli, R. Baldini, Ban, Y., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, P. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chu, X. K., Cibinetto, G., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dou, Z. L., Du, S. X., Duan, P. F., Fang, J., Fang, S. S., Fang, X., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garzia, I., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, S., Gu, Y. T., Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Haddadi, Z., Hafner, A., Han, S., Hao, X. Q., Harris, F. A., He, K. L., He, X. Q., Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, C., Hu, H. M., Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Huang, X. T., Huang, X. Z., Huang, Z. L., Hussain, T., Andersson, Walter Ikegami, Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Johansson, Tord, Julin, A., Kalantar-Nayestanaki, N., Kang, X. L., Kang, X. S., Kavatsyuk, M., Ke, B. C., Khan, T., Kiese, P., Kliemt, R., Kloss, B., Kolcu, O. B., Kopf, B., Kornicer, M., Kupsc, Andrzej, Kuhn, W., Lange, J. S., Lara, M., Larin, P., Lavezzi, L., Leithoff, H., Leng, C., Li, Cui, Li, Cheng, Li, D. M., Li, F., Li, F. Y., Li, G., Li, H. B., Li, H. J., Li, J. C., Li, Jin, Li, Kang, Li, Ke, Li, Lei, Li, P. L., Li, P. R., Li, Q. Y., Li, T., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Z. B., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Lin, D. X., Liu, B., Liu, B. J., Liu, C. X., Liu, D., Liu, F. H., Liu, Fang, Liu, Feng, Liu, H. B., Liu, H. M., Liu, Huanhuan, Liu, Huihui, Liu, J. B., Liu, J. P., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L. D., Liu, P. L., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Z. A., Liu, Zhiqing, Loehner, H., Long, Y. F., Lou, X. C., Lu, H. J., Lu, J. G., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, T., Luo, X. L., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, T., Ma, X. N., Ma, X. Y., Ma, Y. M., Maas, F. E., Maggiora, M., Malik, Q. A., Mao, Y. J., Mao, Z. P., Marcello, S., Messchendorp, J. G., Mezzadri, G., Min, J., Min, T. J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales, C. Morales, Morello, G., Muchnoi, N. Yu., Muramatsu, H., Musiol, P., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Papenbrock, Michael, Patteri, P., Pelizaeus, M., Pellegrino, J., Peng, H. P., Peters, K., Pettersson, Joachim, Ping, J. L., Ping, R. G., Poling, R., Prasad, V., Qi, H. R., Qi, M., Qian, S., Qiao, C. F., Qin, J. J., Qin, N., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Ripka, M., Rong, G., Rosner, Ch., Sarantsev, A., Savrie, M., Schnier, C., Schönning, Karin, Shan, W., Shao, M., Shen, C. P., Shen, P. X., Shen, X. Y., Sheng, H. Y., Song, J. J., Song, W. M., Song, X. Y., Sosio, S., Spataro, S., Sun, G. X., Sun, J. F., Sun, S. S., Sun, X. H., Sun, Y. J., Sun, Y. K., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tang, C. J., Tang, X., Tapan, I., Thorndike, E. H., Tiemens, M., Tsednee, B., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, Dan, Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, Meng, Wang, P., Wang, P. L., Wang, W. P., Wang, X. F., Wang, Y., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. H., Wang, Z. Y., Wang, Zongyuan, Weber, T., Wei, D. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, Magnus, Wu, L. H., Wu, L. J., Wu, Z., Xia, L., Xia, Y., Xiao, D., Xiao, H., Xiao, Y. J., Xiao, Z. J., Xie, Y. G., Xie, Y. H., Xiong, X. A., Xiu, Q. L., Xu, G. F., Xu, J. J., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y. H., Yang, Y. X., Yang, Yifan, Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, J. S., Yuan, C. Z., Yuan, Y., Yuncu, A., Zafar, A. A., Zallo, A., Zeng, Y., Zeng, Z., Zhang, B. X., Zhang, B. Y., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, K., Zhang, L., Zhang, S. Q., Zhang, X. Y., Zhang, Y. H., Zhang, Y. T., Zhang, Yang, Zhang, Yao, Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, W. J., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhou, Y. X., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zotti, L., Zou, B. S., and Zou, J. H.

Subjects
Subatomär fysik, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Subatomic Physics, High Energy Physics::Experiment, ddc:530, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear Experiment, Astrophysics::Galaxy Astrophysics, NO
Abstract

Physical review / D D 97(5), 052005 (2018). doi:10.1103/PhysRevD.97.052005, By analyzing a data sample of 2.93 fb$^{-1}$ collected at $\sqrt s=$ 3.773 GeV with the BESIII detector operated at the BEPCII storage rings, we measure the branching fractions ${\mathcal B}(D^0\to\omega\eta)=(2.15\pm0.17_{\rm stat.}\pm0.15_{\rm sys.})\times 10^{-3}$, ${\mathcal B}(D^0\to\eta\pi^0)=(0.58\pm0.05_{\rm stat.}\pm0.05_{\rm sys.})\times 10^{-3}$, ${\mathcal B}(D^0\to\eta^\prime\pi^0)=(0.93\pm0.11_{\rm stat.}\pm0.09_{\rm sys.})\times 10^{-3}$, ${\mathcal B}(D^0\to\eta\eta)=(2.20\pm0.07_{\rm stat.}\pm0.06_{\rm sys.})\times 10^{-3}$ and ${\mathcal B}(D^0\to\eta^\prime\eta)=(0.94\pm0.25_{\rm stat.}\pm0.11_{\rm sys.})\times 10^{-3}$. We note that ${\mathcal B}(D^0\to \omega\eta)$ is measured for the first time and that ${\mathcal B}(D^0\to \eta\eta)$ is measured with much improved precision., Published by Inst.189733, Melville, NY

Published
2018

24. Measurement of the matrix elements for the decays eta' -> eta pi(+) pi(-) and eta' -> eta pi(0)pi(0)

Author

Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Bai, Y., Bakina, O., Ferroli, R. Baldini, Ban, Y., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chu, X. K., Cibinetto, G., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dorjkhaidav, O., Dou, Z. L., Du, S. X., Duan, P. F., Fang, J., Fang, S. S., Fang, X., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garzia, I., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, S., Gu, Y. T., Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Haddadi, Z., Han, S., Hao, X. Q., Harris, F. A., He, K. L., He, X. Q., Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, C., Hu, H. M., Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Huang, X. T., Huang, X. Z., Huang, Z. L., Hussain, T., Andersson, Walter Ikegami, Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Jin, Y., Johansson, Tord, Julin, A., Kalantar-Nayestanaki, N., Kang, X. L., Kang, X. S., Kavatsyuk, M., Ke, B. C., Khan, T., Khoukaz, A., Kiese, P., Kliemt, R., Koch, L., Kolcu, O. B., Kopf, B., Kornicer, M., Kuemmel, M., Kuhlmann, M., Kupsc, Andrzej, Kuehn, W., Lange, J. S., Lara, M., Larin, P., Lavezzi, L., Leithoff, H., Leng, C., Li, Cui, Li, Cheng, Li, D. M., Li, F., Li, F. Y., Li, G., Li, H. B., Li, H. J., Li, J. C., Li, Jin, Li, K., Li, K. J., Li, Lei, Li, P. L., Li, P. R., Li, Q. Y., Li, T., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Z. B., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Lin, D. X., Liu, B., Liu, B. J., Liu, C. X., Liu, D., Liu, F. H., Liu, Fang, Liu, Feng, Liu, H. B., Liu, H. H., Liu, H. M., Liu, J. B., Liu, J. P., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L. D., Liu, P. L., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Z. A., Liu, Zhiqing, Long, Y. F., Lou, X. C., Lu, H. J., Lu, J. G., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, X. L., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, T., Ma, X. N., Ma, X. Y., Ma, Y. M., Maas, F. E., Maggiora, M., Magnoni, A. S., Malik, Q. A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Min, J., Min, T. J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales, C. Morales, Morello, G., Muchnoi, N. Yu., Muramatsu, H., Mustafa, A., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Papenbrock, Michael, Patteri, P., Pelizaeus, M., Pellegrino, J., Peng, H. P., Peters, K., Pettersson, Joachim, Ping, J. L., Ping, R. G., Poling, R., Prasad, V., Qi, H. R., Qi, M., Qian, S., Qiao, C. F., Qin, N., Qin, X., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Richter, M., Ripka, M., Rolo, M., Rong, G., Rosner, Ch., Ruan, X. D., Sarantsev, A., Savrie, M., Schnier, C., Schönning, Karin, Shan, W., Shao, M., Shen, C. P., Shen, P. X., Shen, Y., Sheng, H. Y., Song, J. J., Song, W. M., Song, X. Y., Sosio, S., Sowa, C., Spataro, S., Sun, G. X., Sun, J. F., Sun, L., Sun, S. S., Sun, X. H., Sun, Y. J., Sun, Y. K., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tang, C. J., Tang, G. Y., Tang, X., Tapan, I., Tiemens, M., Tsednee, B. T., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, Dan, Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, P., Wang, P. L., Wang, W. P., Wang, X. F., Wang, Y., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. H., Wang, Z. Y., Weber, T., Wei, D. H., Wei, J. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, Magnus, Wu, L. H., Wu, L. J., Wu, Z., Xia, L., Xia, Y., Xiao, D., Xiao, H., Xiao, Y. J., Xiao, Z. J., Xie, Y. G., Xie, Y. H., Xiong, X. A., Xiu, Q. L., Xu, G. F., Xu, J. J., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y. H., Yang, Y. X., Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, J. S., Yuan, C. Z., Yuan, Y., Yuncu, A., Zafar, A. A., Zeng, Y., Zeng, Z., Zhang, B. X., Zhang, B. Y., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, K., Zhang, L., Zhang, S. Q., Zhang, X. Y., Zhang, Y., Zhang, Y. H., Zhang, Y. T., Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, W. J., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhou, Y. X., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zou, B. S., and Zou, J. H.

Subjects
Subatomär fysik, Subatomic Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Based on a sample of 1.31 x 10(9) J/psi events collected with the BESIII detector, the matrix elements for the decays eta' -> eta pi(+) pi(-) and eta' -> eta pi(0)pi(0) are determined using 351,016 eta' -> (eta -> gamma gamma)pi' pi(-) and 56,249 eta' -> (eta -> gamma gamma)pi(0) pi(0) events with background levels less than 1%. Two commonly used representations are used to describe the Dalitz plot density. We find that an assumption of a linear amplitude does not describe the data well. A small deviation of the obtained matrix elements between eta' -> eta pi(+) pi(-) and eta' -> eta pi(0)pi(0) is probably caused by the mass difference between charged and neutral pions or radiative corrections. No cusp structure in eta' -> eta pi(0)pi(0) is observed.

Published
2018

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

Author

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

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

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

Published
2016

26. Measurement of the branching fractions of D-s(+) -> eta ' X and D-s(+) -> eta 'rho(+) in e(+)e(-) -> Ds+Ds

Author

Ablikim, M., Achasov, M. N., Ai, X. C., Albayrak, O., Albrecht, M., Ambrose, D. J., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Ferroli, R. Baldini, Ban, Y., Bennett, D. W., Bennett, J. V., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, H. Y., Chen, J. C., Chen, M. L., Chen, S. J., Chen, X., Chen, X. R., Chen, Y. B., Cheng, H. P., Chu, X. K., Cibinetto, G., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Du, S. X., Duan, P. F., Eren, E. E., Fan, J. Z., Fang, J., Fang, S. S., Fang, X., Fang, Y., Fava, L., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. Y., Gao, Y., Gao, Z., Garzia, I., Geng, C., Goetzen, K., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, Y. T., Guan, Y. H., Guo, A. Q., Guo, L. B., Guo, Y., Guo, Y. P., Haddadi, Z., Hafner, A., Han, S., Han, Y. L., Hao, X. Q., Harris, F. A., He, K. L., He, Z. Y., Held, T., Heng, Y. K., Hou, Z. L., Hu, C., Hu, H. M., Hu, J. F., Hu, T., Hu, Y., Huang, G. M., Huang, G. S., Huang, H. P., Huang, J. S., Huang, X. T., Huang, Y., Hussain, T., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, L. L., Jiang, L. W., Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Johansson, Tord, Julin, A., Kalantar-Nayestanaki, N., Kang, X. L., Kang, X. S., Kavatsyuk, M., Ke, B. C., Kiese, P., Kliemt, R., Kloss, B., Kolcu, O. B., Kopf, B., Kornicer, M., Kuehn, W., Kupsc, Andrzej, Lange, J. S., Lara, M., Larin, P., Leng, C., Li, Cui, Li, C. H., Li, Cheng, Li, D. M., Li, F., Li, G., Li, H. B., Li, J. C., Li, Jin, Li, K., Li, Lei, Li, P. R., Li, T., Li, W. D., Li, W. G., Li, X. L., Li, X. M., Li, X. N., Li, X. Q., Li, Z. B., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Lin, D. X., Liu, B. J., Liu, C. X., Liu, F. H., Liu, Fang, Liu, Feng, Liu, H. B., Liu, H. H., Liu, H. M., Liu, J., Liu, J. B., Liu, J. P., Liu, J. Y., Liu, K., Liu, K. Y., Liu, L. D., Liu, P. L., Liu, Q., Liu, S. B., Liu, X., Liu, X. X., Liu, Y. B., Liu, Z. A., Liu, Zhiqiang, Liu, Zhiqing, Loehner, H., Lou, X. C., Lu, H. J., Lu, J. G., Lu, R. Q., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, T., Luo, X. L., Lv, M., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, Q. M., Ma, T., Ma, X. N., Ma, X. Y., Maas, F. E., Maggiora, M., Mao, Y. J., Mao, Z. P., Marcello, S., Messchendorp, J. G., Min, J., Min, T. J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales, C. Morales, Moriya, K., Muchnoi, N. Yu., Muramatsuau, H., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Patteri, P., Pelizaeus, M., Peng, H. P., Peters, K., Pettersson, Joachim, Ping, J. L., Ping, R. G., Poling, R., Prasad, V., Pu, Y. N., Qi, M., Qian, S., Qiao, C. F., Qin, L. Q., Qin, N., Qin, X. S., Qin, Y., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Ren, H. L., Ripka, M., Rong, G., Rosner, Ch., Ruan, X. D., Santoro, V., Sarantsev, A., Savrie, M., Schönning, Karin, Schumann, S., Shan, W., Shao, M., Shen, C. P., Shen, P. X., Shen, X. Y., Sheng, H. Y., Song, W. M., Song, X. Y., Sosio, S., Spataro, S., Sun, G. X., Sun, J. F., Sun, S. S., Sun, Y. J., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tang, C. J., Tang, X., Tapan, I., Thorndike, E. H., Tiemens, M., Ullrich, M., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, P., Wang, P. L., Wang, S. G., Wang, W., Wang, X. F., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. H., Wang, Z. Y., Weber, T., Wei, D. H., Wei, J. B., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, Magnus, Wu, L. H., Wu, Z., Xia, L. G., Xia, Y., Xiao, D., Xiao, Z. J., Xie, Y. G., Xiu, Q. L., Xu, G. F., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y., Yang, Y. X., Ye, H., Ye, M., Ye, M. H., Yin, J. H., Yu, B. X., Yu, C. X., Yu, H. W., Yu, J. S., Yuan, C. Z., Yuan, W. L., Yuan, Y., Yuncu, A., Zafar, A. A., Zallo, A., Zeng, Y., Zhang, B. X., Zhang, B. Y., Zhang, C., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J. J., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, K., Zhang, L., Zhang, S. H., Zhang, X. Y., Zhang, Y., Zhang, Y. N., Zhang, Y. H., Zhang, Y. T., Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, Q. W., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, W. J., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, Li, Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhu, K., Zhu, K. J., Zhu, S., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zotti, L., Zou, B. S., and Zou, J. H.

Subjects
D-s, Physical Sciences, BESIII, Fysik, High Energy Physics::Experiment, Branching fractions, Nuclear Experiment
Abstract

We study D-s(+) decays to final states involving the eta' with a 482 pb(-1) data sample collected at root s = 4.009 GeV with the BESIII detector at the BEPCII collider. We measure the branching fractions B(D-s(+) -> eta'X) = (8.8 +/- 1.8 +/- 0.5)% and B(D-s(+) > eta'rho(+)) = (5.8 +/- 1.4 +/- 0.4)% where the first uncertainty is statistical and the second is systematic. In addition, we estimate an upper limit on the non-resonant branching ratio B(D-s(+) -> eta'pi(+)pi(0)) < 5.1% at the 90% confidence level. Our results are consistent with CLEO's recent measurements and help to resolve the disagreement between the theoretical prediction and CLEO's previous measurement of B(D-s(+) -> eta'rho(+)).

Published
2015

27. Charge symmetry breaking in dd -> He-4 pi(0) with WASA-at-COSY

Author

Adlarson, Patrik, Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, M., Calén, Hans, Ciepal, I., Clement, H., Coderre, D., Czerwinski, E., Demmich, K., Doroshkevich, E., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., Foehl, K., Fransson, Kjell E. I., Goldenbaum, F., Goslawski, P., Goswami, A., Grigoryev, K., Gullström, Carl-Oscar, Hanhart, C., Hauenstein, F., Heijkenskjöld, Lena, Hejny, V., Höistad, Bo, Huesken, N., Jarczyk, L., Johansson, Tord, Kamys, B., Kemmerling, G., Khan, F. A., Khoukaz, A., Kirillov, D. A., Kistryn, S., Kleines, H., Klos, B., Krzemien, W., Kulessa, P., Kupsc, Andrzej, Kuzmin, A., Lalwani, K., Lersch, D., Lorentz, B., Magiera, A., Maier, R., Marciniewski, Pawel, Marianski, B., 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, Damian, Pyszw, K., Pyszniak, Andrzej, 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., Stroher, H., Szczurek, A., Taschner, A., Trzcinski, A., Varma, R., Wolke, Magnus, Wronska, A., Wustner, P., Wurm, P., Yamamoto, A., Yurev, L., Zabierowski, J., Zielinski, M. J., Zink, A., Zlomanczuk, Jozef, Zupranski, P., and Zurek, M.

Subjects
Nuclear Theory, Charge symmetry breaking, Physical Sciences, Fysik, Pion production, Nuclear Experiment, Deuteron-deuteron interactions
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 -> He-4 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(d) = 1.2GeV/c using the WASA-at-COSY facility. The total cross section amounts to sigma(tot) =(118 +/- 18(stat) +/- 13(sys) +/- 8(ext)) p band first data on the differential cross section are consistent with s-wave pion production.

Published
2014

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