32 v 1 2 3 Ja n 20 06 Search for Θ + via π − p → K − X reaction near production threshold
نویسندگان
چکیده
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 1530MeV/c 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 → KΘ reaction which is 4.3μb at 90% confidence level assuming that Θ is produced isotropically in the center of mass system. PACS: 12.39.Mk; 13.75.-n, 13.75.Gx; 14.20.-c
منابع مشابه
0 60 10 32 v 2 2 4 Fe b 20 06 Search for Θ + via π − p → K − X reaction near production threshold
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 1530MeV/c 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 ...
متن کاملar X iv : h ep - e x / 06 01 02 0 v 1 1 3 Ja n 20 06 ISR PHYSICS AT BABAR
We present a review of BaBar results on e+e-annihilations into exclusive hadronic final states using the initial state radiation technique. Cross sections over the √ s range from threshold to 4.5 GeV, with very small point-to-point systematic errors, are presented for the 3π, 2(π + π −), 3(π + π −), 2(π + π −)2π 0 , K + K − π + π − , 2(K + K −) and p¯ p final states. The proton form factor and ...
متن کاملX iv : n uc l - ex / 0 11 20 12 v 3 1 4 Ja n 20 02 Analyzing power of the ~ pp → ppπ 0 reaction at beam energy of 390 MeV
The analyzing power of pp → ppπ 0 reaction has been measured at the beam energy of 390 MeV. The missing mass technique of final protons has been applied to identify the π 0 production event. The dependences of the analyzing power on the pion emission-angle and the relative momentum of the protons have been obtained. The angular dependence could be decomposed by the Legendre polynomial and the r...
متن کاملar X iv : h ep - p h / 04 01 07 2 v 3 2 3 Ja n 20 04 Cavendish - HEP -
The narrow width of the exotic narrow baryon resonance Θ might be explained by mixing between the two nearly degenerate states that arise in models with two diquarks and an antiquark. The only open Θ decay channel is KN . When two states both coupled to a single dominant decay mode are mixed by the loop diagram via this decay mode, diagonalization of the loop diagram decouples one mass eigensta...
متن کاملar X iv : h ep - p h / 04 01 07 2 v 1 1 1 Ja n 20 04 Cavendish - HEP - 04 / 03 The narrow width of the Θ + - a possible explanation
The narrow width of the exotic narrow baryon resonance Θ might be explained by mixing between the two nearly degenerate states that arise in models with two diquarks and an antiquark. The only open Θ decay channel is KN . When two states both coupled to a single dominant decay mode are mixed by the loop diagram via this decay mode, diagonalization of the loop diagram decouples one mass eigensta...
متن کامل