submitted to acta physica slovaca 1 – 6 WASA at COSY
نویسنده
چکیده
The Wide Angle Shower Apparatus (WASA) has been transferred from the storage ring CELSIUS (TSL, Uppsala, Sweden) to the cooler synchrotron COSY (FZ Jülich, Germany). In this presentation, the status and planning of the WASAatCOSY project are reported. The main physics aspects are rare decays of η and η' mesons and isospin violation in deuteron-deuteron interactions.
منابع مشابه
ar X iv : h ep - t h / 02 07 15 4 v 1 1 6 Ju l 2 00 2 submitted to acta physica slovaca 1 – 8 MANIFESTLY GAUGE INVARIANT COMPUTATIONS
Using a gauge invariant exact renormalization group, we show how to compute the effective action, and extract the physics, whilst manifestly preserving gauge invariance at each and every step. As an example we give an elegant computation of the one-loop SU(N) YangMills beta function, for the first time at finite N without any gauge fixing or ghosts. It is also completely independent of the deta...
متن کاملsubmitted to acta physica slovaca 1 – 6 Discussion
Discussion of the η → π 0 γγ decay within a chiral unitary approach We improve the calculations of the η → π 0 γγ decay within the context of meson chiral lagrangians. We use a chiral unitary approach for the meson-meson interaction, thus generating the a0(980) resonance and fixing the longstanding sign ambiguity on its contribution. This also allows us to calculate the loops with one vector me...
متن کاملsubmitted to acta physica slovaca BERRY PHASE DUE TO QUANTUM MEASUREMENTS ∗
The usual, “static” version of the quantum Zeno effect consists in the hindrance of the evolution of a quantum systems due to repeated measurements. There is however a “dynamic” version of the same phenomenon, first discussed by von Neumann in 1932 and subsequently explored by Aharonov and Anandan, in which a system is forced to follow a given trajectory. A Berry phase appears if such a traject...
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The reaction dd → 3Henπ0 has been measured at a beam momentum of pd = 1.2 GeV/c using the WASA-at-COSY facility. For the first time data on the total cross section as well as differential distributions were obtained. The data are described with a phenomenological approach based on the combination of a quasi-free model and a partial wave expansion model for the three-body reaction.
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The light scalar mesons a0/ f0(980) are being investigated at COSY-Jülich by detecting the strong decays into KK̄ and πη /ππ as well as radiative decays into vector mesons. Selected results are discussed with emphasis on recent measurements at the ANKE and WASA spectrometers.
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