A search for resonances in K−p interactions at 3.95 GeV/c

Radial excitations of the decuplet baryons

“…Note that the presented values are obtained taking the average of the corresponding values obtained via two different sum rules presented in Eq. (20). The two some rules' predictions differ with amount of maximally 5% with each other that we have included in the errors.…”

“…As is seen from Eq. (20) in order to obtain the numerical values of the mass and residue of the radial excitations of the decuplet baryons, we need to have the values of the mass and residue of the ground states. Because of this, firstly, we calculate the mass and residue of the ground state particles by choosing an appropriate threshold s 0 according to the standard prescriptions.…”

“…For this aim the sum rules in Eq. (20) are used. When taking into account the contributions of the radial excitations, the continuum threshold should be changed compared to the previous case.…”

“…This consistency suggests that the Ξ(1950) state can be assigned as the first excited state of the ground state Ξ(1530). For more information about Ξ(1950) state see for instance [18][19][20][21][22][23][24] and references therein.…”

Are there S = -2 pentaquarks?

“…In this context, some of the negative experiences accumulated in the past with lowstatistics, low-significance hadron spectroscopy, are recalled. Figure 2: Summary of data on Ξ − π +0 -spectroscopy a) [24,17,27], b) [13,29], c) [28,18,15], d) [22,23]. Figure 4: a) Summary of high statistics data on Ξ − π + -spectroscopy [8,9,11,12]; b) deviation from a straight line fit to the data (excluding the Ξ * (1530)) in units of sigma.…”