548 research outputs found
Study of narrow baryon resonance decaying into in -interactions at with SVD-2
The inclusive reaction was studied at IHEP accelerator
with proton beam using SVD-2 detector. Two different samples of
, statistically independent and belonging to different phase space
regions were used in the analyses and a narrow baryon resonance with the mass
was observed in both samples of the
dataComment: 3 pages, 6 figures, to be published in the Proceedings of the XXXIII
International Conference of High Energy Physics (ICHEP'06), Moscow, 200
Absence of evidence for pentaquarks on the lattice
We study the question of whether or not QCD predicts a pentaquark state. We
use the improved, fixed point lattice QCD action which has very little
sensitivity to the lattice spacing and also allows us to reach light quark
masses. The analysis was performed on a single volume of size with lattice spacing of fm. We use the
correlation matrix method to identify the ground and excited states in the
isospin 0, negative parity channel. In the quenched approximation where
dynamical quark effects are omitted, we do not find any evidence for a
pentaquark resonance in QCD.Comment: 17 pages, 5 figures replaced with revised versio
How to measure the parity of the in collisions
Triggered by a recent paper by Thomas, Hicks and Hosaka, we investigate which
observables can be used to determine the parity of the from the
reaction near its production threshold. In
particular, we show that the sign of the spin correlation coefficient
for small excess energies yields the negative of the parity of the .
The argument relies solely on the Pauli principle and parity conservation and
is therefore model--independent.Comment: References completed, discussion on possible influence of background
added; conclusions unchange
Some (further) Comments on the Theta(1540) Pentaquark
Additional broader I=0 states in the KN channel near (1540) are
expected in many models, making the absence of any signature in the
K-deuteron scattering data even more puzzling.
In an ideal "three-body" picture the is viewed as two compact
ud(1)ud(2) color diquarks and an quark. A "QCD-type"
inequality involving , the mass of the L=1 excitation and that of a new I=0 tetraquark vector meson then follows.
The inequality suggests a very light new vector meson, and is violated.
We note that "associated production" of the pentaquark with another
quadriquark or anti-pentaquark may be favored. This along with some estimates
of the actual production cross sections suggest that the can be found
in BaBar or Belle e-e colliders.Comment: 6 page
Positive parity pentaquark towers in large Nc QCD
We construct the complete set of positive parity pentaquarks, which
correspond in the quark model to {\bar s} q^{Nc+1} states with one unit of
orbital angular momentum L=1. In the large Nc limit they fall into the K=1/2
and K=3/2 irreps (towers) of the contracted SU(4)c symmetry. We derive
predictions for the mass spectrum and the axial couplings of these states at
leading order in 1/Nc. The strong decay width of the lowest-lying positive
parity exotic state is of order O(1/Nc), such that this state is narrow in the
large Nc limit. Replacing the antiquark with a heavy antiquark {\bar Q}
q^{Nc+1}, the two towers become degenerate, split only by O(1/mQ) hyperfine
interactions. We obtain predictions for the strong decay widths of heavy
pentaquarks to ordinary baryons and heavy H(*)_{\bar Q} mesons at leading order
in 1/Nc and 1/mQ.Comment: 21 pages, 2 figures, 5 table
The collective quantization of three-flavored Skyrmions revisited
A self-consistent large approach is developed for the collective
quantization of SU(3) flavor hedgehog solitons, such as the Skyrmion. The key
to this analysis is the determination of all of the zero modes associated with
small fluctuations around the hedgehog. These are used in the conventional way
to construct collective coordinates. This approach differs from previous work
in that it does not implicitly assume that each static zero mode is associated
with a dynamical zero mode. It is demonstrated explicitly in the context of the
Skyrmion that there are fewer dynamical zero modes than static ones due to the
Witten-Wess-Zumino term in the action. Group-theoretic methods are employed to
identify the physical states resulting from canonical quantization of the
collectively rotating soliton. The collective states fall into representations
of SU(3) flavor labeled by and are given by
where is the spin of the collective state. States with
strangeness do not arise as collective states from this procedure; thus
the (pentaquark) resonance does not arise as a collective
excitation in models of this type.Comment: 12 pages; uses package "youngtab
KKbar photoproduction from protons
We study the contribution of the Drell mechanism driven by K^+ and K^-
exchange to the reaction gamma N -> KKbar N. Our calculation implements the
full KN and KbarN reaction amplitudes in the form of partial wave amplitudes
taken from a meson-exchange model (KN) and a partial wave analysis (KbarN),
respectively. Comparing our results to data of the LAMP2 collaboration we
observe that the Drell mechanism alone cannot describe the large Lambda(1520)
photoproduction rate observed experimentally. We argue that the discrepancy
could be due to significant contributions from K*-meson exchange with
subsequent excitation of the Lambda(1520) resonance. After adding such
contributions to our model a good agreement of the LAMP2 experiment is
achieved. When applying the same model to the recent SAPHIR data we find an
excellent description of the K^+p spectrum and can determine the parameters of
the Lambda(1600) P01 resonance, M_R = 1617 +/- 2 MeV and Gamma_R = 117 +/- 4
MeV, from the K^-p mass distribution.Comment: updated version, analysis of new CLAS data included, 11 pages, 11
figure
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