Have Pentaquark States Been seen?

Abstract

The status of the search for pentaquark baryons is reviewed in light of new results from the first two dedicated experiments from CLAS at Jefferson Lab and of new analyses from several laboratories on the $Thet{a}^{+}(1540)$. Evidence for and against two heavier pentaquark states is also discussed.

Added some references, corrected typos

References in corpus (4)

• The pentaquark in K-plus-d total cross section data
• Analysis of Theta^+ production in K^+Xe collisions
• Search for the Phi(1860) Pentaquark at COMPASS
• A Phenomenological Lagrangian Approach to Two Kaon Photoproduction and Pentaquark Searches

Cited by in corpus (17)

• Results from the N* program at JLab
• Improvement of the Theta+ width estimation method on the Light Cone
• Observation of a narrow structure in p(gamma,K_s)X via interference with phi-meson production
• Formation of a narrow baryon resonance with positive strangeness in K^+ collisions with Xe nuclei
• An explanation why the Theta+ is seen in some experiments and not in others
• A possible explanation why the Theta+ is seen in some experiments and not in others
• Theta+ formation in inclusive gamma D -> pK- X
• K*-couplings for the antidecuplet excitation
• A Search for Sigma^0_5, N^0_5 and Theta^++ Pentaquark States
• On strange SU(3) partners of Theta+
• Tetraquarks and Pentaquarks in String Models
• Systematic study of pentaquark states: $qqq-q\bar{q}$ configuration
• Calculating loops without loop calculations: NLO computation of pentaquark correlators
• Testing the bootstrap constraints in the strange sector
• Observation of a narrow baryon resonance with positive strangeness formed in $K^{+}$Xe collisions
• Importance of Mixing for Exotic Baryons
• Experimental search for radiative decays of the pentaquark baryon Θ^+(1540)