131 research outputs found
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 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
cm at 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
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