Search for Theta+ via K+p -> pi+X reaction with a 1.2 GeV/c K+ beam

Abstract

The Theta+ was searched for via the K+p -> pi+X reaction using the 1.2 GeV/c K+ beam at the K6 beam line of the KEK-PS 12 GeV Proton Synchrotron. In the missing mass spectrum of the K+p -> pi+X reaction, no clear peak structure was observed. Therefore a 90 % C.L. upper limit of 3.5 ub/sr was derived for the differential cross section averaged over 2degree to 22degree in the laboratory frame of the K+p -> pi+Theta+ reaction. This upper limit is much smaller than the theoretical calculation for the t-channel process where a K0* is exchanged. From the present result, either the t-channel process is excluded or the coupling constant of g_{K*NΘ} is quite small.

11pages, 13figures

References in corpus (34)

• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Diquarks and Exotic Spectroscopy
• Observation of an Exotic $S=+1$ Baryon in Exclusive Photoproduction from the Deuteron
• Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei
• Evidence for the positive-strangeness pentaquark ${\Theta }^{+}$ in photoproduction with the SAPHIR detector at ELSA
• Observation of an Exotic Baryon with S=+1 in Photoproduction from the Proton
• Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
• A Diquark-Triquark Model for the KN Pentaquark
• Evidence for a narrow baryonic state decaying to K0s-p and K0s-pbar in deep inelastic scattering at HERA
• Evidence for a narrow resonance at 1530 MeV/c2 in the K0 p - system of the reaction pp --> Sigma+ K0 p from the COSY-TOF experiment
• Evidence for formation of a narrow pKshort resonance with mass near 1533 MeV in neutrino interactions
• K+ nucleon scattering and exotic S=+1 Baryons
• Experimental Limits on the Width of the Reported Theta(1540)+
• Search for the Pentaquark State in $\psi (2S)$ and $J/\psi$ Decays to $K_S^{0}p{K}^{-}\bar{n}$ and $K_S^0\bar{p}{K}^{+}n$
• Experimental Search for Pentaquarks
• Search for the ${\Theta }^{+}$ pentaquark in the reaction $\gamma d\to p{K}^{-}{K}^{+}n$
• Search for ${\Theta }^{+}(1540)$ pentaquark in high statistics measurement of $\gamma p\to {\bar{K}}^0{K}^{+}n$ at CLAS
• Limits for the central production of Theta^+ and Xi^{--} pentaquarks in 920 GeV pA collisions
• Search for the ${\bar{\Theta }}^{-}\to$ K${}^{-}$ $\bar{n}$ with PHENIX
• Exotic Theta^+ baryon production induced by a photon and a pion
• Cross sections for pentaquark baryon production from protons in reactions induced by hadrons and photons
• High Statistics Search for the Theta+(1.54) Pentaquark State
• Further evidence for formation of a narrow baryon resonance with positive strangeness in K+ collisions with Xe nuclei
• Pentaquark Searches at CDF
• Search for Theta+ via pi- p --> K- X reaction near production threshold
• Observation of narrow baryon resonance decaying into $p{K}_s^0$ in pA-interactions at $70GeV/c$ with SVD-2 setup
• Determining the ${\Theta }^{+}$ quantum numbers through the $K^{+}p\to {\pi }^{+}{K}^{+}n$ reaction
• Improved study of a possible Theta+ production in the pp -> p K0 sigma+ reaction with the COSY-TOF spectrometer
• Theta^+ baryon production in KN and NN reactions
• Observation of S=+1 narrow resonances in the system $K_s^{0}p$ from p+$C_3{H}_8$ collision at 10 GeV/c
• Pentaquarks: Review on Models and Solitonic Calculations of Antidecuplet Magnetic Moments
• $\Theta +$: Another Explanation and Prediction
• Phenomenological study of two-meson couplings of Theta+
• Four- and Five-Body Scattering Calculations

Cited by in corpus (8)

• Evidence of the Θ^+ in the γd \to K^+K^-pn reaction
• Search for the ${\Theta }^{+}$ pentaquark via the ${\pi }^{-}p\to K^{-}X$ reaction at 1.92 GeV/$c$
• Present status on experimental search for pentaquarks
• High-resolution search for the ${\Theta }^{+}$ pentaquark via a pion-induced reaction at J-PARC
• Axial-vector transitions and strong decays of the baryon antidecuplet in the self-consistent SU(3) chiral quark-soliton model
• Spin-3/2 Pentaquark in QCD Sum Rules
• Photoproduction of the Theta^+ and its vector and axial-vector structure
• Photoproduction of Theta^+(1540,1/2^+) reexamined with new theoretical information