Some (further) Comments on the Theta(1540) Pentaquark

Abstract

Additional broader I=0 states in the KN channel near ${\Theta }^{+}$(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 $\Theta$ is viewed as two compact ud(1)ud(2) $\bar{3}$ color diquarks and an $\bar{s}$ quark. A "QCD-type" inequality involving $m({\Theta }^{+}),m(\Lambda )$, the mass of the $\Lambda (1/2^{-})$ 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 $\Theta$ can be found in BaBar or Belle e${}^{+}$-e${}^{-}$ colliders.

arXiv comment6 pages

References in corpus (26)

• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Diquarks and Exotic Spectroscopy
• Exotic Anti-Decuplet of Baryons: Prediction from Chiral Solitons
• Observation of an Exotic $S=+1$ Baryon in Exclusive Photoproduction from the Deuteron
• Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei
• Evidence for the positive-strangeness pentaquark ${\Theta }^{+}$ in photoproduction with the SAPHIR detector at ELSA
• Observation of an Exotic Baryon with S=+1 in Photoproduction from the Proton
• Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
• A Diquark-Triquark Model for the KN Pentaquark
• K+ nucleon scattering and exotic S=+1 Baryons
• Stable $uudd\bar{s}$ pentaquarks in the constituent quark model
• Experimental Limits on the Width of the Reported Theta(1540)+
• Phenomenology of the Pentaquark Antidecuplet
• Z^* Resonances: Phenomenology and Models
• Interpretation of the Theta+ as an isotensor pentaquark with weakly decaying partners
• QCD Inequalities
• Influence of a Z+(1540) resonance on K+N scattering
• Pentaquark states in a chiral potential
• ${\Theta }^{+}$ in a chiral constituent quark model and its interpolating fields
• Positive Parity Pentaquarks Pragmatically Predicted
• Pentaquark Theta+, constituent quark structures, and prediction of charmed Theta(c)^0 and bottomed Theta(b)^+
• A study of pentaquark $\Theta$ state in the chiral SU(3) quark model
• The $J=3/2$ ${\Theta }^{\ast }$ partner to the $\Theta (1540)$ baryon
• QCD inequalities for the nucleon mass and the free energy of baryonic matter
• Pentaquark spectrum in string dynamics
• The Narrow Theta(1543)--A QCD Dilemma: Tube or Not Tube?

Cited by in corpus (2)

• The Physics of the B Factories
• Search for the pentaquark candidate ${\Theta }^{+}$(1540) in the hyperon beam experiment WA89