The Pentaquark Candidates in the Dynamical Diquark Picture

By R. Lebed. 2015

245 citations recorded by the source corpus.

Abstract Starting with the dynamical picture of the exotic c c ¯ -containing states XYZ as the confinement-induced hadronization of a rapidly separating pair of a compact diquark and antidiquark, we describe the pentaquark candidates P c + ( 4380 ) and P c + ( 4450 ) in terms of a confined but rapidly separating color-antitriplet diquark cu and color-triplet “triquark” c ¯ ( u d ) . This separation explains the relatively small P c + widths, despite these 5-quark systems lying far above both the J / ψ p and Λ c D ¯ ( ⁎ ) 0 thresholds. The P c + states are predicted to form isospin doublets with neutral partners P c 0 .

Subfields: Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/4c19369012d548ed4f16012f61cff6de644eb020

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In Atomic and Molecular Physics, and Optics

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Citations in the corpus

Multiquark States (2017, background): “It was suggested that momentary separation of c and c̄, followed by immediate hadronization, can be a result of a production mechanism pushing them in opposite directions [173].”
Observation of $J/\psi p$ Resonances Consistent with Pentaquark States in $\Lambda_b^0 \to J/\psi K^- p$ Decays (2015, background): “It should also be noted that the explanation of the pentaquarks in terms of a confined, yet rapidly separating, uc diquark and c(ud) pair does not have this difficulty [84].”
Heavy-quark QCD exotica (2016, methodology): “The pentaquarks Pc can be constructed by an extension of the dynamical diquark attraction [55] to the color-triplet attraction of triquarks, c̄3̄(qq)3̄ → [c̄(qq)]3, thus describing the Pc as diquark-triquark states.”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, background): “This seems to indicate that diquarks play a role in their structure [474,645]; it is hard to accommodate orbitally excited states in the framework of a bound state of color neutral hadrons.”
Nonstandard heavy mesons and baryons: Experimental evidence (2017, background): “and the four states seen decaying to J/ψφ (329; 389), and provide a common origin for the Pc(4380) and Pc(4450) pentaquarks that can accommodate their opposite parities (390; 391).”
Exotics: Heavy pentaquarks and tetraquarks (2017, background): “Another possibility is via the sequential formation of compact color triplets, making up diquark-triquark systems, yielding also color-singlet states [382, 383].”
Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarks (2019, background): “[15] R.”
Hadronic molecules (2017, background): “…2016b), pionnucleon reactions (Kim et al., 2016; Lin et al., 2017; Liu 16 and Oka, 2016b), or search for their strange (Chen et al., 2016d; Feijoo et al., 2015, 2016; Lu et al., 2016b; Ramos et al., 2016), neutral (Lebed, 2015; Lü et al., 2016) and bottomonium (Xiao and Meißner, 2015) partners.”
Multiquark Resonances (2016, background): “A diquark-diquark-antiquark description has been proposed in [121, 395, 396] (see also Section 4.”
Exotic Hadrons from Heavy Ion Collisions (2017, background): “After the observation of the two P + c structures, many theoretical works appeared proposing various explanations for these structures [191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209].”
The hidden-charm pentaquark and tetraquark states (2016, background): “[393], which was based upon a mechanism proposed to study tetraquark states [394].”