2006
DOI: 10.1063/1.2220285
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The Rise and Fall of Pentaquarks in Experiments

Abstract: Abstract.Experimental evidence for and against the existence of pentaquarks has accumulated rapidly in the last three years. If they exist, they would be dramatic examples of hadronic states beyond our well-tested and successful particle models. The positive evidence suggests existence of baryonic objects with widths of at most a few MeV, some displaying exotic quantum numbers, such as baryons with strangeness S = +1. The non-observations of these states have often come from reaction channels very different fr… Show more

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Cited by 19 publications
(19 citation statements)
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“…Multiple entries for a single event, which occur when more than one pion candidate passes the track selection criteria, were suppressed by limiting the angular separation of the B 0 s candidate and the charged track. 20 The resultant B 0 s π ± invariant mass spectrum, shown in Fig. 24a, has a narrow structure that is approximately 60 MeV above the m Bs + m π threshold.…”
Section: B Bottommentioning
confidence: 98%
“…Multiple entries for a single event, which occur when more than one pion candidate passes the track selection criteria, were suppressed by limiting the angular separation of the B 0 s candidate and the charged track. 20 The resultant B 0 s π ± invariant mass spectrum, shown in Fig. 24a, has a narrow structure that is approximately 60 MeV above the m Bs + m π threshold.…”
Section: B Bottommentioning
confidence: 98%
“…However, the Roper width is not the only problem posed for the pentaquark interpretation. There is also the problem that recent experimental results have not confirmed previous claims concerning the existence of pentaquark states [46]. A different analysis argues that the Roper width can be reproduced in a model where the Roper wave function has a 30% admixture of a qqqqq component [47].…”
Section: B Q 2 Dependence Of the Axial N → Form Factorsmentioning
confidence: 89%
“…A feature of interest is that the step in C S per unit strangeness for "decuplet", δ 10 = (N − 1)/[(N + 1)(N + 9)], is greater than that for "antidecuplet", δ 10 = N/[(N + 3)(N + 9)], although they coincide for N = 3, and we do not consider the case of N = 1 6 . It can be seen also from Tables 1,2 that the parameter for expansion C S = (α/N)[1 + β/N + ...] is ∼ 7/N, 9/N, 11/N, 13/N, ..., for the "octet", "decuplet", "{27}" and "{35}"-plets, so, it increases with increasing values of (p, q) defining the multiplet [8].…”
Section: Strangeness Contents Of Baryons For Arbitrary Number Of Colorsmentioning
confidence: 99%
“…in [5,6]. Consideration of baryon states in the present paper is relevant independently on particular values of masses, widths and other properties of exotic baryon states measured experimentally.…”
mentioning
confidence: 99%