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P. Adlarson
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P. Adlarson
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Nuclear Experiment (28)
 
High Energy Physics - Experiment (16)
 
High Energy Physics - Phenomenology (4)
 
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Publications Authored By P. Adlarson

The double-polarization observable $E$ and the helicity-dependent cross sections $\sigma_{1/2}$ and $\sigma_{3/2}$ have been measured for the first time for single $\pi^{0}$ photoproduction from protons and neutrons bound in the deuteron at the electron accelerator facility MAMI in Mainz, Germany. The experiment used a circularly polarized photon beam and a longitudinally polarized deuterated butanol target. The reaction products, recoil nucleons and decay photons from the $\pi^0$ meson were detected with the Crystal Ball and TAPS electromagnetic calorimeters. Read More

Exclusive measurements of the quasi-free $pn \to pp\pi^-$ and $pp \to pp\pi^0$ reactions have been performed by means of $pd$ collisions at $T_p$ = 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region $T_p = 0. Read More

The reactions $\gamma p\to \eta p$ and $\gamma p\to \eta' p$ have been measured from their thresholds up to the center-of-mass energy $W=1.96$GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections were obtained with unprecedented accuracy, providing fine energy binning and full production-angle coverage. Read More

The Dalitz decay pi^0 -> e^+e^-gamma has been measured in the gamma p -> pi^0 p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the pi^0 electromagnetic transition form factor, a_pi = 0.030+/-0. Read More

The search for 4He-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd->3He n pi0 and dd->3He p pi- processes. The beam momentum was varied continuously between 2.127 GeV/c and 2. Read More

Using the production reactions $pd\to {}^3\mbox{He}\,\omega$ and $pp\to pp\omega$, the Dalitz plot distribution for the $\omega \to \pi^+ \pi^- \pi^0$ decay is studied with the WASA detector at COSY, based on a combined data sample of $ (4.408\pm 0.042) \times 10^4$ events. Read More

The Dalitz decays eta -> e^+e^-g and omega -> pi^0 e^+e^- have been measured in the g p -> eta p and g p -> omega p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the electromagnetic transition form factor of eta, Lambda^{-2}_eta=(1.97+/-0. Read More

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

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

The WASA-at-COSY experiment has collected $3\times10^{7}$ events with $\eta$-mesons produced via the reaction $pd\rightarrow{^{3}\textrm{He}}\eta$ at $\textrm{T} = 1.0 \textrm{GeV}$. Using this data set, we evaluate the branching ratios of the decays $\eta\to\pi^{+}\pi^{-}\gamma$, $\eta\to e^{+}e^{-}\gamma$, $\eta\to\pi^{+}\pi^{-}e^{+}e^{-}$ and $\eta\to e^{+}e^{-}e^{+}e^{-}$. Read More

Differential cross sections for the gamma p -> pi^0 p reaction have been measured with the A2 tagged-photon facilities at the Mainz Microtron, MAMI C, up to the center-of-mass energy W=1.9 GeV. The new results, obtained with a fine energy and angular binning, increase the existing quantity of pi^0 photoproduction data by ~47%. Read More

The MesonNet International Workshop was held in the Laboratori Nazionali di Frascati from September the 29th to October the 1st, 2014, being the concluding meeting of the MesonNet research network within EU HadronPhysics3 project. MesonNet is a research network focused on light meson physics gathering experimentalist and theoreticians from Europe and abroad. An overview of the research projects related to the scope of the network is presented in these mini-proceedings. Read More

Exclusive measurements of the quasi-free $np \to np\pi^0\pi^0$ reaction have been performed by means of $dp$ collisions at $T_d$ = 2.27 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region $\sqrt s$ = (2. Read More

Exclusive and kinematically complete measurements of the double pionic fusion to $^3$He have been performed in the energy region of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the $\pi\pi$-invariant mass spectrum. The experiments were carried out with the WASA detector setup at COSY. Similar to the observations in the basic $pn \to d \pi^0\pi^0$ reaction and in the $dd \to ^4$He$\pi^0\pi^0$ reaction, the data reveal a correlation between the ABC effect and a resonance-like energy dependence in the total cross section. Read More

2014Aug
Authors: P. Adlarson1, W. Augustyniak2, W. Bardan3, M. Bashkanov4, F. S. Bergmann5, M. Berłowski6, H. Bhatt7, M. Büscher8, H. Calén9, I. Ciepał10, H. Clement11, D. Coderre12, E. Czerwiński13, K. Demmich14, E. Doroshkevich15, R. Engels16, A. Erven17, W. Erven18, W. Eyrich19, P. Fedorets20, K. Föhl21, K. Fransson22, F. Goldenbaum23, P. Goslawski24, A. Goswami25, K. Grigoryev26, C. --O. Gullström27, F. Hauenstein28, L. Heijkenskjöld29, V. Hejny30, M. Hodana31, B. Höistad32, N. Hüsken33, A. Jany34, B. R. Jany35, L. Jarczyk36, T. Johansson37, B. Kamys38, G. Kemmerling39, F. A. Khan40, A. Khoukaz41, D. A. Kirillov42, S. Kistryn43, H. Kleines44, B. Kłos45, M. Krapp46, W. Krzemień47, P. Kulessa48, A. Kupść49, K. Lalwani50, D. Lersch51, B. Lorentz52, A. Magiera53, R. Maier54, P. Marciniewski55, B. Mariański56, M. Mikirtychiants57, H. --P. Morsch58, P. Moskal59, H. Ohm60, I. Ozerianska61, E. Perez del Rio62, N. M. Piskunov63, P. Podkopał64, D. Prasuhn65, A. Pricking66, D. Pszczel67, K. Pysz68, A. Pyszniak69, C. F. Redmer70, J. Ritman71, A. Roy72, Z. Rudy73, S. Sawant74, S. Schadmand75, T. Sefzick76, V. Serdyuk77, R. Siudak78, T. Skorodko79, M. Skurzok80, J. Smyrski81, V. Sopov82, R. Stassen83, J. Stepaniak84, E. Stephan85, G. Sterzenbach86, H. Stockhorst87, H. Ströher88, A. Szczurek89, A. Täschner90, A. Trzciński91, R. Varma92, G. J. Wagner93, M. Wolke94, A. Wrońska95, P. Wüstner96, P. Wurm97, A. Yamamoto98, L. Yurev99, J. Zabierowski100, M. J. Zieliński101, A. Zink102, J. Złomańczuk103, P. {Ż}uprański104, M. {Ż}urek105, R. L. Workman106, W. J. Briscoe107, I. I. Strakovsky108
Affiliations: 1WASA-at-COSY Collaboration, 2WASA-at-COSY Collaboration, 3WASA-at-COSY Collaboration, 4WASA-at-COSY Collaboration, 5WASA-at-COSY Collaboration, 6WASA-at-COSY Collaboration, 7WASA-at-COSY Collaboration, 8WASA-at-COSY Collaboration, 9WASA-at-COSY Collaboration, 10WASA-at-COSY Collaboration, 11WASA-at-COSY Collaboration, 12WASA-at-COSY Collaboration, 13WASA-at-COSY Collaboration, 14WASA-at-COSY Collaboration, 15WASA-at-COSY Collaboration, 16WASA-at-COSY Collaboration, 17WASA-at-COSY Collaboration, 18WASA-at-COSY Collaboration, 19WASA-at-COSY Collaboration, 20WASA-at-COSY Collaboration, 21WASA-at-COSY Collaboration, 22WASA-at-COSY Collaboration, 23WASA-at-COSY Collaboration, 24WASA-at-COSY Collaboration, 25WASA-at-COSY Collaboration, 26WASA-at-COSY Collaboration, 27WASA-at-COSY Collaboration, 28WASA-at-COSY Collaboration, 29WASA-at-COSY Collaboration, 30WASA-at-COSY Collaboration, 31WASA-at-COSY Collaboration, 32WASA-at-COSY Collaboration, 33WASA-at-COSY Collaboration, 34WASA-at-COSY Collaboration, 35WASA-at-COSY Collaboration, 36WASA-at-COSY Collaboration, 37WASA-at-COSY Collaboration, 38WASA-at-COSY Collaboration, 39WASA-at-COSY Collaboration, 40WASA-at-COSY Collaboration, 41WASA-at-COSY Collaboration, 42WASA-at-COSY Collaboration, 43WASA-at-COSY Collaboration, 44WASA-at-COSY Collaboration, 45WASA-at-COSY Collaboration, 46WASA-at-COSY Collaboration, 47WASA-at-COSY Collaboration, 48WASA-at-COSY Collaboration, 49WASA-at-COSY Collaboration, 50WASA-at-COSY Collaboration, 51WASA-at-COSY Collaboration, 52WASA-at-COSY Collaboration, 53WASA-at-COSY Collaboration, 54WASA-at-COSY Collaboration, 55WASA-at-COSY Collaboration, 56WASA-at-COSY Collaboration, 57WASA-at-COSY Collaboration, 58WASA-at-COSY Collaboration, 59WASA-at-COSY Collaboration, 60WASA-at-COSY Collaboration, 61WASA-at-COSY Collaboration, 62WASA-at-COSY Collaboration, 63WASA-at-COSY Collaboration, 64WASA-at-COSY Collaboration, 65WASA-at-COSY Collaboration, 66WASA-at-COSY Collaboration, 67WASA-at-COSY Collaboration, 68WASA-at-COSY Collaboration, 69WASA-at-COSY Collaboration, 70WASA-at-COSY Collaboration, 71WASA-at-COSY Collaboration, 72WASA-at-COSY Collaboration, 73WASA-at-COSY Collaboration, 74WASA-at-COSY Collaboration, 75WASA-at-COSY Collaboration, 76WASA-at-COSY Collaboration, 77WASA-at-COSY Collaboration, 78WASA-at-COSY Collaboration, 79WASA-at-COSY Collaboration, 80WASA-at-COSY Collaboration, 81WASA-at-COSY Collaboration, 82WASA-at-COSY Collaboration, 83WASA-at-COSY Collaboration, 84WASA-at-COSY Collaboration, 85WASA-at-COSY Collaboration, 86WASA-at-COSY Collaboration, 87WASA-at-COSY Collaboration, 88WASA-at-COSY Collaboration, 89WASA-at-COSY Collaboration, 90WASA-at-COSY Collaboration, 91WASA-at-COSY Collaboration, 92WASA-at-COSY Collaboration, 93WASA-at-COSY Collaboration, 94WASA-at-COSY Collaboration, 95WASA-at-COSY Collaboration, 96WASA-at-COSY Collaboration, 97WASA-at-COSY Collaboration, 98WASA-at-COSY Collaboration, 99WASA-at-COSY Collaboration, 100WASA-at-COSY Collaboration, 101WASA-at-COSY Collaboration, 102WASA-at-COSY Collaboration, 103WASA-at-COSY Collaboration, 104WASA-at-COSY Collaboration, 105WASA-at-COSY Collaboration, 106SAID Data Analysis Center, 107SAID Data Analysis Center, 108SAID Data Analysis Center

New data on quasifree polarized neutron-proton scattering, in the region of the recently observed $d^*$ resonance structure, have been obtained by exclusive and kinematically complete high-statistics measurements with WASA at COSY. This paper details the determination of the beam polarization, checks of the quasifree character of the scattering process, on all obtained $A_y$ angular distributions and on the new partial-wave analysis, which includes the new data producing a resonance pole in the $^3D_3$-$^3G_3$ coupled partial waves at ($2380\pm10 - i40\pm5$) MeV -- in accordance with the $d^*$ dibaryon resonance hypothesis. The effect of the new partial-wave solution on the description of total and differential cross section data as well as specific combinations of spin-correlation and spin-transfer observables available from COSY-ANKE measurements at $T_d$ = 2. Read More

Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUMF and IUCF are currently used to develop a consistent description of CSB within the framework of chiral perturbation theory. In this work the experimental studies on the reaction dd->4He{\pi}0 have been extended towards higher excess energies in order to provide information on the contribution of p-waves in the final state. Read More

2014Jun

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

Exclusive and kinematically complete high-statistics measurements of quasifree polarized $\vec{n}p$ scattering have been performed in the energy region of the narrow resonance structure $d^*$ with $I(J^P) = 0(3^+)$, $M \approx$ 2380 MeV/$c^2$ and $\Gamma \approx$ 70 MeV observed recently in the double-pionic fusion channels $pn \to d\pi^0\pi^0$ and $pn \to d\pi^+\pi^-$. The experiment was carried out with the WASA detector setup at COSY having a polarized deuteron beam impinged on the hydrogen pellet target and utilizing the quasifree process $\vec{d}p \to np + p_{spectator}$. That way the $np$ analyzing power $A_y$ was measured over a large angular range. Read More

2014Feb

We present new data for angular distributions and on the cross section ratio of the p + d -> 3He + eta reaction at excess energies of Q = 48.8 MeV and Q = 59.8 MeV. Read More

2013Jun

Exclusive measurements of the quasi-free $pn \to pp\pi^0\pi^-$ reaction have been performed by means of $pd$ collisions at $T_p$ = 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region $\sqrt s$ = (2. Read More

2013Apr

An exclusive measurement of the dd -> 3He n \pi 0 reaction was carried at a beam momentum of p = 1.2 GeV/c using the WASA-at-COSY facility. For the first time data on the total cross section as well as differential distributions were obtained. Read More

2013Apr

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

2013Jan
Authors: P. Adlarson1, W. Augustyniak2, W. Bardan3, M. Bashkanov4, T. Bednarski5, F. S. Bergmann6, M. Berlowski7, H. Bhatt8, M. Buescher9, H. Calen10, H. Clement11, D. Coderre12, E. Czerwinski13, K. Demmich14, E. Doroshkevich15, R. Engels16, W. Erven17, W. Eyrich18, P. Fedorets19, K. Foehl20, K. Fransson21, F. Goldenbaum22, P. Goslawski23, A. Goswami24, K. Grigoryev25, C. -O. Gullstroem26, F. Hauenstein27, L. Heijkenskjoeld28, V. Hejny29, F. Hinterberger30, M. Hodana31, B. Hoeistad32, A. Jany33, B. R. Jany34, L. Jarczyk35, T. Johansson36, B. Kamys37, G. Kemmerling38, F. A. Khan39, A. Khoukaz40, S. Kistryn41, J. Klaja42, H. Kleines43, B. Klos44, M. Krapp45, W. Krzemien46, P. Kulessa47, A. Kupsc48, K. Lalwani49, D. Lersch50, L. Li51, B. Lorentz52, A. Magiera53, R. Maier54, P. Marciniewski55, B. Marianski56, M. Mikirtychiants57, H. -P. Morsch58, P. Moskal59, B. K. Nandi60, S. Niedzwiecki61, H. Ohm62, I. Ozerianska63, E. Perez del Rio64, P. Plucinski65, P. Podkopal66, D. Prasuhn67, A. Pricking68, D. Pszczel69, K. Pysz70, A. Pyszniak71, C. F. Redmer72, J. Ritman73, A. Roy74, Z. Rudy75, S. Sawant76, S. Schadmand77, A. Schmidt78, T. Sefzick79, V. Serdyuk80, N. Shah81, M. Siemaszko82, R. Siudak83, T. Skorodko84, M. Skurzok85, J. Smyrski86, V. Sopov87, R. Stassen88, J. Stepaniak89, E. Stephan90, G. Sterzenbach91, H. Stockhorst92, H. Stroeher93, A. Szczurek94, T. Tolba95, A. Trzcinski96, R. Varma97, P. Vlasov98, G. J. Wagner99, W. Weglorz100, M. Wolke101, A. Wronska102, P. Wuestner103, P. Wurm104, A. Yamamoto105, X. Yuan106, L. Yurev107, J. Zabierowski108, C. Zheng109, M. J. Zielinski110, W. Zipper111, J. Zlomanczuk112, P. Zupranski113, M. Zurek114
Affiliations: 1WASA-at-COSY collaboration, 2WASA-at-COSY collaboration, 3WASA-at-COSY collaboration, 4WASA-at-COSY collaboration, 5WASA-at-COSY collaboration, 6WASA-at-COSY collaboration, 7WASA-at-COSY collaboration, 8WASA-at-COSY collaboration, 9WASA-at-COSY collaboration, 10WASA-at-COSY collaboration, 11WASA-at-COSY collaboration, 12WASA-at-COSY collaboration, 13WASA-at-COSY collaboration, 14WASA-at-COSY collaboration, 15WASA-at-COSY collaboration, 16WASA-at-COSY collaboration, 17WASA-at-COSY collaboration, 18WASA-at-COSY collaboration, 19WASA-at-COSY collaboration, 20WASA-at-COSY collaboration, 21WASA-at-COSY collaboration, 22WASA-at-COSY collaboration, 23WASA-at-COSY collaboration, 24WASA-at-COSY collaboration, 25WASA-at-COSY collaboration, 26WASA-at-COSY collaboration, 27WASA-at-COSY collaboration, 28WASA-at-COSY collaboration, 29WASA-at-COSY collaboration, 30WASA-at-COSY collaboration, 31WASA-at-COSY collaboration, 32WASA-at-COSY collaboration, 33WASA-at-COSY collaboration, 34WASA-at-COSY collaboration, 35WASA-at-COSY collaboration, 36WASA-at-COSY collaboration, 37WASA-at-COSY collaboration, 38WASA-at-COSY collaboration, 39WASA-at-COSY collaboration, 40WASA-at-COSY collaboration, 41WASA-at-COSY collaboration, 42WASA-at-COSY collaboration, 43WASA-at-COSY collaboration, 44WASA-at-COSY collaboration, 45WASA-at-COSY collaboration, 46WASA-at-COSY collaboration, 47WASA-at-COSY collaboration, 48WASA-at-COSY collaboration, 49WASA-at-COSY collaboration, 50WASA-at-COSY collaboration, 51WASA-at-COSY collaboration, 52WASA-at-COSY collaboration, 53WASA-at-COSY collaboration, 54WASA-at-COSY collaboration, 55WASA-at-COSY collaboration, 56WASA-at-COSY collaboration, 57WASA-at-COSY collaboration, 58WASA-at-COSY collaboration, 59WASA-at-COSY collaboration, 60WASA-at-COSY collaboration, 61WASA-at-COSY collaboration, 62WASA-at-COSY collaboration, 63WASA-at-COSY collaboration, 64WASA-at-COSY collaboration, 65WASA-at-COSY collaboration, 66WASA-at-COSY collaboration, 67WASA-at-COSY collaboration, 68WASA-at-COSY collaboration, 69WASA-at-COSY collaboration, 70WASA-at-COSY collaboration, 71WASA-at-COSY collaboration, 72WASA-at-COSY collaboration, 73WASA-at-COSY collaboration, 74WASA-at-COSY collaboration, 75WASA-at-COSY collaboration, 76WASA-at-COSY collaboration, 77WASA-at-COSY collaboration, 78WASA-at-COSY collaboration, 79WASA-at-COSY collaboration, 80WASA-at-COSY collaboration, 81WASA-at-COSY collaboration, 82WASA-at-COSY collaboration, 83WASA-at-COSY collaboration, 84WASA-at-COSY collaboration, 85WASA-at-COSY collaboration, 86WASA-at-COSY collaboration, 87WASA-at-COSY collaboration, 88WASA-at-COSY collaboration, 89WASA-at-COSY collaboration, 90WASA-at-COSY collaboration, 91WASA-at-COSY collaboration, 92WASA-at-COSY collaboration, 93WASA-at-COSY collaboration, 94WASA-at-COSY collaboration, 95WASA-at-COSY collaboration, 96WASA-at-COSY collaboration, 97WASA-at-COSY collaboration, 98WASA-at-COSY collaboration, 99WASA-at-COSY collaboration, 100WASA-at-COSY collaboration, 101WASA-at-COSY collaboration, 102WASA-at-COSY collaboration, 103WASA-at-COSY collaboration, 104WASA-at-COSY collaboration, 105WASA-at-COSY collaboration, 106WASA-at-COSY collaboration, 107WASA-at-COSY collaboration, 108WASA-at-COSY collaboration, 109WASA-at-COSY collaboration, 110WASA-at-COSY collaboration, 111WASA-at-COSY collaboration, 112WASA-at-COSY collaboration, 113WASA-at-COSY collaboration, 114WASA-at-COSY collaboration

An exclusive measurement of the excitation function for the dd->3Heppi- reaction was performed at the Cooler Synchrotron COSY-Juelich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 GeV/c to 2. Read More

2012Dec

Exclusive and kinematically complete high-statistics measurements of the basic double pionic fusion reactions pn -> dpi0pi0, pn -> d pi+pi- and pp -> dpi+pi0 have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given by the dpi0pi0 channel exhibits the ABC effect, i.e. Read More

2012Jun

Exclusive and kinematically complete high-statistics measurements of the double pionic fusion reaction $dd \to ^4$He$\pi^0\pi^0$ have been performed in the energy range 0.8 - 1.4 GeV covering thus the region of the ABC effect, which denotes a pronounced low-mass enhancement in the $\pi\pi$-invariant mass spectrum. Read More

These are the proceedings of the second PrimeNet Workshop, held in September 26-28, 2011, at the campus of Forschungszentrum J\"{u}lich, Germany. This workshop is part of the activities in the project "Study of Strongly Interacting Matter" (acronym HadronPhysics2), which is an integrating activity of the Seventh Framework Program of EU. This HP2 project contains several activities, one of them being the network PrimeNet having the focus on Meson Physics in Low-Energy QCD. Read More

2011Jul
Authors: P. Adlarson, C. Adolph, W. Augustyniak, W. Bardan, M. Bashkanov, T. Bednarski, F. S. Bergmann, M. Berłowski, H. Bhatt, K. -T. Brinkmann, M. Büscher, H. Calén, H. Clement, D. Coderre, E. Czerwiński, E. Doroshkevich, R. Engels, W. Erven, W. Eyrich, P. Fedorets, K. Föhl, K. Fransson, F. Goldenbaum, P. Goslawski, K. Grigoryev, C. -O. Gullström, C. Hanhart, L. Heijkenskjöld, J. Heimlich, V. Hejny, F. Hinterberger, M. Hodana, B. Höistad, M. Jacewicz, A. Jany, B. R. Jany, L. Jarczyk, T. Johansson, B. Kamys, G. Kemmerling, O. Khakimova, A. Khoukaz, S. Kistryn, J. Klaja, H. Kleines, B. Kłos, F. Kren, W. Krzemień, P. Kulessa, A. Kupść, K. Lalwani, S. Leupold, B. Lorentz, A. Magiera, R. Maier, B. Mariański, P. Marciniewski, U. -G. Meißner, M. Mikirtychiants, H. -P. Morsch, P. Moskal, B. K. Nandi, S. Niedźwiecki, H. Ohm, A. Passfeld, C. Pauly, E. Perez del Rio, T. Petri, Y. Petukhov, N. Piskunov, P. Pluciński, P. Podkopał, A. Povtoreyko, D. Prasuhn, A. Pricking, K. Pysz, A. Pyszniak, T. Rausmann, C. F. Redmer, J. Ritman, A. Roy, Z. Rudy, S. Sawant, S. Schadmand, A. Schmidt, T. Sefzick, V. Serdyuk, N. Shah, M. Siemaszko, R. Siudak, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, G. Sterzenbach, H. Stockhorst, F. Stollenwerk, A. Szczurek, A. Täschner, C. Terschlüsen, T. Tolba, A. Trzciński, R. Varma, P. Vlasov, G. J. Wagner, W. Węglorz, A. Winnemöller, A. Wirzba, M. Wolke, A. Wrońska, P. Wüstner, P. Wurm, X. Yuan, L. Yurev, J. Zabierowski, C. Zheng, M. J. Zieliński, W. Zipper, J. Złomańczuk, P. Żuprański

An exclusive measurement of the decay eta --> pi+ pi- gamma has been performed at the WASA facility at COSY. The eta mesons were produced in the fusion reaction pd --> 3He X at a proton beam momentum of 1.7 GeV/c. Read More

2011Jul

The reaction pp->pppi0pi0 has been investigated at a beam energy of 1.4 GeV using the WASA-at-COSY facility. The total cross section is found to be (324 +- 21_systematic +- 58_normalization) mub. Read More

2011Apr
Authors: P. Adlarson, C. Adolph, W. Augustyniak, V. Baru, M. Bashkanov, F. S. Bergmann, M. Berlowski, H. Bhatt, K. -T. Brinkmann, M. Buescher, H. Calen, H. Clement, D. Coderre, E. Czerwinski, E. Doroshkevich, C. Ekstrom, R. Engels, W. Erven, W. Eyrich, P. Fedorets, K. Foehl, K. Fransson, F. Goldenbaum, P. Goslawski, K. Grigoryev, V. Grishina, C. -O. Gullstrom, J. Hampe, C. Hanhart, L. Heijkenskj, V. Hejny, F. Hinterberger, M. Hodana, B. Hoistad, M. Jacewicz, M. Janusz, A. Jany, B. R. Jany, L. Jarczyk, J. Jaus, T. Johansson, B. Kamys, G. Kemmerling, O. Khakimova, A. Khoukaz, S. Kistryn, J. Klaja, H. Kleines, B. Klos, F. Kren, W. Krzemien, P. Kulessa, S. Kullander, A. Kupsc, K. Lalwani, B. Lorentz, A. Magiera, R. Maier, P. Marciniewski, B. Marianski, M. Mikirtychiants, P. Moskal, H. -P. Morsch, B. K. Nandi, H. Ohm, A. Passfeld, C. Pauly, E. Perez del Rio, Y. Petukhov, N. Piskunov, P. Plucinski, P. Podkopal, A. Povtoreyko, D. Prasuhn, A. Pricking, K. Pysz, T. Rausmann, C. F. Redmer, J. Ritman, A. Roy, R. J. M. Y. Ruber, Z. Rudy, S. Schadmand, A. Schmidt, W. Schroeder, T. Sefzick, V. Serdyuk, N. Shah, M. Siemaszko, R. Siudak, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, G. Sterzenbach, H. Stockhorst, H. Stroeher, A. Szczurek, A. Taeschner, T. Tolba, A. Trzcinski, R. Varma, P. Vlasov, G. J. Wagner, W. Weglorz, A. Winnemoeller, A. Wirzba, M. Wolke, A. Wronska, P. Wuestner, P. Wurm, L. Yurev, J. Zabierowski, M. J. Zielinski, W. Zipper, J. Zlomanczuk, P. Zupranski

We report on a high-statistics measurement of the basic double pionic fusion reaction $pn \to d\pi^0\pi^0$ over the energy region of the so-called ABC effect, a pronounced low-mass enhancement in the $\pi\pi$-invariant mass spectrum. The measurements were performed with the WASA detector setup at COSY. The data reveal the ABC effect to be associated with a Lorentzian shaped energy dependence in the integral cross section. Read More

One of the objectives of the physics programme of the WASA-at-COSY facility is to study the isospin violating eta hadronic decays into pi+pi-pi0$ systems driven by the term of QCD Lagrangian which depends on the d and u quark mass difference. These studies can be made in terms of the Dalitz plot parameters describing the density population which is proportional to the square of the amplitude |A(x,y)|^2. This contribution describes the current status of the analysis of the eta->pi+pi-pi0 decay in the pd->3He eta and as well in the pp->pp eta reaction with WASA-at-COSY. Read More