Search for pentaquarks at Belle
نویسنده
چکیده
Abstract We search for the strange pentaquark Θ+ using kaon interactions in the material of the Belle detector. No signal is observed in the pKS final state, while in the pK − final state we observe ∼ 1.6 · 104 Λ(1520) → pK decays. We set an upper limit on the ratio of Θ+ to Λ(1520) yields σ(Θ+)/σ(Λ(1520)) < 2% at 90% CL, assuming that the Θ+ is narrow. We also report on searches for strange and charmed pentaquarks in B meson decays. These results are obtained from a 155 fb data sample collected with the Belle detector near the Υ(4S) resonance, at the KEKB asymmetric energy e+e− collider.
منابع مشابه
Experimental Search for Pentaquarks
The experimental evidence for pentaquarks, both old and new, is discussed. Constraints due toKN scattering data from previous decades is first reviewed, followed by experiments with positive evidence and those with null results. Finally, the problem of the narrow width of the Θ pentaquark is discussed, along with theoretical implications.
متن کاملSearch for Pentaquarks in the Hadronic Decays of the Z Boson with the DELPHI detector at LEP
The quark model does not exclude pentaquark systems. Recent controversial evidence for such states has been published, in particular for a strange pentaquark Θ 1540 , for a double-strange state called Ξ 1862 and for a charmed state Θc 3100 0. Such states should be produced in e e annihilations in Z decays. In this paper a search for pentaquarks using the DELPHI detector is described. Preliminar...
متن کاملPentaquarks and new hadron spectroscopy at BABAR
Recent results on the search for pentaquarks and on charmonium spectroscopy at BABAR are reviewed. The latter includes the observation of the puzzling new state X(3872) → J/ψ π π− in B decays, and the searches for X(3872) in two-body B decays and initial state radiation events. Contributed to the Proceedings of the XI International Conference on Elastic and Diffractive Scattering, 5/15/2005—20/...
متن کاملar X iv : h ep - e x / 05 03 04 7 v 1 2 6 M ar 2 00 5 Belle Preprint 2005 - 13 KEK Preprint 2005 - 4
The angular distributions of the baryon-antibaryon low-mass enhancements seen in the charmless three-body baryonic B decays B+ → pp̄K+, B0 → pp̄K0 S , and B0 → pΛ̄π are reported. A quark fragmentation interpretation is supported, while the gluonic resonance picture is disfavored. Searches for the Θ+ and Θ++ pentaquarks in the relevant decay modes and possible glueball states G with 2.2 GeV/c2 < Mp...
متن کاملSearch for charmed pentaquarks in high energy neutrino interactions
Several experiments have reported the existence of a bound state of five quarks with s̄ content, knows as Θ. However, the existence of pentaquark states with charm quark content is still controversial. In this paper we focus on weakly decaying charmed pentaquarks and show how they can be searched for in high energy anti-neutrino interactions. We discuss their possible mass and branching ratios a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004