Magnetic moment of theΘ+pentaquark state

Abstract

We have calculated the magnetic moment of the recently observed Θ + pentaquark in the framework of the light cone QCD sum rules using the photon distribution amplitudes. We find that µ Θ + = (0.12 ± 0.06)µ N , which is quite small. We also compare our result with predictions of other groups.

Production of the Pentaquark Exotic Baryon $Xi_5$ in $bar{K}N$ Scattering: $bar{K}N o KXi_5$ and $bar{K}N o K^{*}Xi_5$

“…We see that the total cross sections are almost a hundred times smaller than that for the positive-parity Ξ 5 . The difference between the results of the two parities is even more pronounced than in the previously investigated reactions such as γN, KN and NN scattering [15,16,17,18,19,20,21,24,25,26,27,28,29,30], where typically the difference was about order of ten. In the present reaction, the interference between the s-and u-channels becomes important in addition to the kinematical effect in the p-wave coupling for the positive-parity (but not in the s-wave for the negative-parity), which is proportional to σ · q enhancing the amplitude at high momentum transfers.…”

“…For example, the chiral soliton model [2,4], the diquark model [5], the chiral potential model [6], and constituent quark models with spin-flavor interactions [10,11,12] prefer the positive-parity for the Θ + , whereas the QCD sum rule approach [7,8] 1 and the quenched lattice QCD [13,14] have supported the negative-parity. In the meanwhile, various reactions for the Θ + production [15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30] has been investigated, where the determination of the parity of Θ + has been emphasized. In many cases, the total cross sections of the positive-parity Θ + production is typically about ten times larger than those of the negative-parity one.…”

“…The experimental observation of the Θ + performed by the LEPS collaboration at SPring-8 [1], which is motivated by Diakonov et al [2], have paved the way for intensive studies on the exotic five-quark baryon states, also known as pentaquarks, experimentally [3] as well as theoretically [2,4,5,6,7,8,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]. As a consequence of the finding of the Θ + , the existence of other pentaquark baryons such as the N 5 , Σ 5 and Ξ 5 , which have been also predicted theoretically, has been anticipated.…”

Octet, decuplet, and antidecuplet magnetic moments in the chiral quark soliton model reexamined

“…The magnetic moments of the positive-parity pentaquarks have been studied by a number of authors in different models [26,27,28,29,30]. The results are displayed in Table V.…”

Heavy and light pentaquark effective chiral Lagrangian

“…Interested readers are referred to Refs. [47,52,58,59,60] for details. Here we list the results only.…”