منابع مشابه
Are There S=-2 Pentaquarks?
Recent evidence for pentaquark baryons in the channels Ξ − π − , Ξ − π + and their anti-particles claimed by the NA49 collaboration is critically confronted with the vast amount of existing data on Ξ spectroscopy which was accumulated over the past decades. It is shown that the claim is at least partially inconsistent with these data. In addition two further exotic channels of the pentaquark ty...
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Pentaquark states with strangeness S = +1 and IJπ = 0 2 ± ,1 1 2 ± ,0 2 ± ,1 2 ± are investigated using the QCD sum rule technique. Throughout the calculation, we emphasize the importance of the establishment of a valid Borel window, which corresponds to a region of the Borel mass, where the operator product expansion (OPE) converges and the presumed ground state pole dominates the sum rules. W...
متن کاملThere are two 2–twist-spun trefoils
We give a short proof inspired by Carter et al [1] that the 2–twist-spun trefoil is not isotopic to its orientation reverse. The proof uses a computer calculation of the third homology group of the three colour rack. We also give a new proof using the same calculation of the well-known fact that the left and right trefoil knots are not isotopic. AMS Classification 57Q45; 57M25, 57M27
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By assuming a mass formula for the spectrum of the Y = 2 pentaquarks, where the chromo-magnetic interaction plays a main role, and identifying the lightest state with the Θ + (1540), we predict a spectrum in good agreement with the few I = 0 and I = 1 candidates proposed in the past.
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2004
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s2004-01952-8