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Contents : Wednesday HK 61: Fundamental Symmetries Time: Wednesday 16:30 18:45 Group Report Location: H-ZO 70 HK 61.1 We 16:30 H-ZO 70 TRI P facility for the study of fundamental interaction and symmetries P.D. Shidling G.S. Giri K. Jungmann W.L. Kruithof M. Sohani D.J. van der Hoek O.O. Versolato L. Willmann and H.W. Wilschut KVI University of Groningen The Netherlands Rare and short lived radioactive isotopes provide unique possibility for the study of fundamental interaction and symmetries. At TRI P different radioactive isotopes are produced in inverse kinematics mode. Dual magnetic separator is used for separating fast radioactive isotopes of interest from the primary beam. For example 21 Na are produced with a yield of 104 /s/pnA(of primary beam) in the 20 Ne (2 H n)21 Na reaction. Produced fast radioactive isotopes are converted into low energy ion beams in thermal ionizer. This allows one to collect e ciently and transport the ions into magneto-Optical Trap (MOT) and ions are neutralized in MOT chamber. We will measure - energy and angular correlation measurement in decay for 21 Na. From this measurement deviation from the weak interaction (V-A type) can be studied. One of the other measurements which are of our particular interest is search of permanent electric dipole moment and to improve the value for parity non conservation in Ra. Di erent radium isotopes have been produced in inverse kinematics. 213 Ra has been produced with a typical yield of 103 /s/pnA (Pb beam) in 206 Pb (12 C 5n) 213 Ra reaction. A procedure to trap Ra e ectively has been successfully developed by the rst time trapping of Ba. Details on the facility and new technological approaches for several units of the TRI P facility will be presented. HK 61.2 We 17:00 1000 : 1. Im Vortrag werden die Testmessungen vorgestellt und die erreichten Emp ndlichkeiten diskutiert. 1 P.G. Harris C.A. Baker K. Green et al. Phys. Rev. Lett. 82(1999) 904 2 K. Green P.G. Harris P. Iaydjiev et al. Nucl. Instr. and Meth. A 404(1998) 381 HK 61.4 We 17:30 H-ZO 70 Measurement of the cross section e+ e + 0 0 via Radiative Return at BaBar Andreas Hafner Miriam Fritsch and Achim Denig Universit t Mainz a We present a measurement of the cross section of the exclusive hadronic reaction e+ e + 0 0 with the Babar detector at PEP-II an e+e- collider running at the xed CMS energy of 10.6 GeV. Events with photon emission in the initial state (ISR) are used lowering the e ective CMS energy of the hadronic system and allowing for a measurement of the entire energy range 4.5 GeV (so-called Radiative Return). The preliminary precision of the measurement has a systematic uncertainty of ca. 8% and will be further reduced in near future. The measurement is also interesting from the hadron spectroscopy point-of-view we see a dominance of the 0 and a1(1260) intermediate states and we can extract for the rst time the branching ratio of the J/ + 0 0 decay. Cross section measurements of this kind are needed as input for a precise theoretical prediction of the anomalous magnetic moment of the muon. A comparison of the theory prediction with the direct measurement of the muon anomaly allows a unique precision test of the Standard Model of particle physics. H-ZO 70 Wigner and Serber symmetries for Nucleon-Nucleon Interactions and the large Nc limit. Alvaro Calle Cordon and Enrique Ruiz Arriola Universidad de Granada Granada Spain Wigner symmetry in nuclear physics provides a unique example of a non-perturbative long distance symmetry a symmetry strongly broken at short distances. We analyse the consequences of such a concept within the framework of One Boson Exchange Potentials in NN scattering and keeping the leading Nc contributions. Phenomenologically successful relations between singlet 1 S0 and triplet 3 S1 scattering phase shifts are provided in the entire elastic region. We establish symmetry breaking relations among non-central phase shifts which are successfully ful lled by even-L partial waves and strongly violated by odd-L partial waves in full agreement with large Nc requirements. The Serber force has relative orbital parity symmetry and requires the vanishing NN interactions in partial waves with odd angular momentum. We illustrate how is well ful lled for spin triplet states and violated for even singlet states. We show that interpreted as a long distance symmetry this feature can be made plausible from a large Nc perspective. A prerequisite for this is the identity of the scalar and vector meson resonance masses. While these masses arise as poles on the Second Riemann in scattering we nd that within the large Nc expansion the corresponding Yukawa masses correspond instead to their location as Breit-Wigner resonances. HK 61.5 We 17:45 H-ZO 70 Investigations of t

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