Scalar Mesons in B-decays

We summarize some persistent problems in scalar spectroscopy and discuss what could be learned here from charmless B-decays. Recent experimental results are discussed in comparison with theoretical expectations: a simple model based on penguin dominance leads to various symmetry relations in good agreement with recent data; a factorisation approach yields absolute predictions of rates. For more details, see Ref. 1.Comment: Plenary talk (W.O.) at XI International Conference on Hadron Spectroscopy (Hadron05), Rio de Janeiro, Aug. 21-26, 2005, to be publ. by AIP, 13 pages, 4 figure

Gluonic Meson Production

The existence of glueballs is predicted in QCD, the lightest one with quantum numbers J^{PC}=0^{++}, but different calculations do not well agree on its mass in the range below 1800 MeV. Several theoretical schemes have been proposed to cope with the experimental data which often have considerable uncertainties. Further experimental studies of the scalar meson sector are therefore important and we discuss recent proposals to study leading clusters in gluon jets and charmless B-decays to serve this purpose.Comment: Talk at Ringberg Workshop "New Trens in HERA Physics 2003", Sept.28-Oct.3, 2003 (by W.O.), to appear in Proceedings, 12 pages, 2 figure

Neutrino dipole moments and charge radii in noncommutative space-time

In this paper we obtain a bound $\Lambda_{\rm NC} < 150$ TeV on the scale of space-time noncommutativity considering photon-neutrino interactions. We compute "star-dipole moments" and "star-charge radii" originating from space-time noncommutativity and compare them with the dipole moments calculated in the neutrino-mass extended standard model (SM). The computation depends on the nature of the neutrinos, Dirac versus Majorana, their mass and the energy scale. We focus on Majorana neutrinos. The "star-charge radius" is found to be $r^* = \sqrt{|_{\rm NC}|} =|3\sum_{i=1}^3 ({\theta}^{0i})^2|^{1/4} < 1.6 \times 10^{-19}$ cm at $\Lambda_{\rm NC} = 150$ TeV.Comment: 6 pages; v2: references added, major revisions, much higher bound on NC scale obtained; v3: electromagnetic properties of neutrino in neutrino-mass extended Standard Model discussed in detail, presentation and Title improve