Search for Θ+ via π−p→K−X reaction near production threshold

2006/01/31 by K. Miwa, J. K. Ahn, K. Aoki +19 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex

paper · pdf · doi:10.1016/j.physletb.2006.02.048

published as Phys.Lett.B635:72-79,2006 · 12pages, 6figures, to be published in Physics Letters B

arxiv created 2006/02/24 · openalex publication_date 2006/03/04 · arxiv updated 2009/12/01 · openalex created_date 2017/08/31 · openalex updated_date 2026/05/01

Abstract

We have searched for Θ⁺ via π^-p → K^-X reaction using 1.87 and 1.92 GeV/c π^- beam at the K2 beam line of the KEK 12 GeV Proton Synchrotron. In the missing mass spectrum at beam momentum of 1.92 GeV/c, a bump has been found at 1530 MeV/c² which is consistent with the mass reported by several experiments. The statistical significance of this bump, however, is only 2.5-2.7σ. Therefore we have derived the upper limit of Θ⁺ production cross section via π^-p → K^-Θ⁺ reaction which is 4.3μb at 90% confidence level assuming that Θ⁺ is produced isotropically in the center of mass system.

Citations

• ExoticΘ+baryon production induced by a photon and a pion
• Diquarks and Exotic Spectroscopy
• Pentaquark Searches at CDF
• Limits for the Central Production ofΘ+andΞ--Pentaquarks in 920-GeV pA Collisions

Cited by

• Magnetic and Axial-Vector Transitions of the Baryon Antidecuplet