منابع مشابه
Decay Probability Ratio of Pentaquark Θ State
The pentaquark state of Θ+(uudds) has been observed to decay with two decay modes: Θ+ → nK+ and Θ+ → pK0. The decay probability ratio of the two decay modes is studied with general symmetry consideration of isospin, spin, and parity. We arrive at a result of the ratio Γ(Θ →nK) Γ(Θ+→pK0) = (α−β) 2 (α+β)2 (1 k2 )2L+1, which is valid for the Θ+ state to be a pure isoscalar or isovector state, or a...
متن کاملPentaquark State for the Clas Collaboration
Recent reports about the Θ + (formerly known as Z +), a pentaquark state, have awakened public opinion. We report our findings in search of a Θ ++ state in the reaction γp→ Θ ++ K − from our analysis of CLAS data. The existence or nonexistence of this state might resolve the question of the isotensor states. ++ The constituent quark model does not exclude penta-quark systems. So far only bound ...
متن کاملMagnetic Moment of The Θ Pentaquark State
We have calculated the magnetic moment of the recently observed Θ+ pentaquark state in the framework of the light cone QCD sum rules using the photon distribution amplitudes. We find that μΘ+ = (0.12± 0.06)μN , which is quite small. We also compare our result with predictions of other groups. PACS number: 12.39.Mk, 12.38.Lg, 12.40.Yx
متن کاملMagnetic moment of the pentaquark Θ(1540) as diquark-diquark-antiquark state with QCD sum rules
In this article, we study the magnetic moment of the pentaquark state Θ+(1540) as diquark-diquark-antiquark ([ud][ud]s̄) state with the QCD sum rules in the external weak electromagnetic field (EFSR) and the light-cone QCD sum rules (LCSR) respectively. The numerical results indicate the magnetic moment is about μΘ+ = −(0.11 ± 0.02)μN for the EFSR and μΘ+ ≈ −(0.1−0.5)μN for the LCSR. As the valu...
متن کاملThe volume dependence of spectral weights and the pentaquark state
Before studying the pentaquark system we examine the spectral weights of the two lowest scattering states in the two-pion system in the isospin I=2 channel on lattices of size 163 ×32, 243 ×32 and 323 ×64 at β = 6.0 in the quenched theory. We find that the spectral weights scale with the volume for large time separations. Therefore very accurate data are necessary in order that the spectral wei...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2005
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.71.062202