Evidence for Exotic Meson Production in the Reaction
نویسندگان
چکیده
The ? system has been studied in the reaction ? p ! ? p at 18 GeV=c. A large asymmetry in the angular distribution is observed indicating interference between L-even and L-odd partial waves. The a 2 (1320) is observed in the
منابع مشابه
Meson B fragmentation function with consideration of mass corrections
Study of B meson (meson with the bottom quark flavor) in Large Hadron Collider (LHC) is of special importance so that the detector LHCb is devoted to investigate these types of mesons. For this reason, in this paper we will study the production process of this meson in a phenomenological approach using the experimental data from electron-positron annihilation. In this regards, we shall calculat...
متن کامل(T/E) SEARCH FOR BACKWARDS-PRODUCED EXOTIC MESON RESONANCES IN 8.4 GeV/c fi+p INTERACTIONS*
Results are reported from a hybrid experiment designed to search for backwards-produced charge = +2 exotic meson resonances by investigating the reaction fi+ + p -t X -I-+ + n(forward) at 8.4 GeV/c. The data reported here correspond to approximately 30 events per microbarn. No clear evidence for narrow exotic mesons was found for masses < 3.0 GeV in the decay modes accessible for study which in...
متن کاملAMPLITUDE ANALYSIS OF REACTIONS π−p → ηπ−p AND π−p → ηπn MEASURED ON POLARIZED TARGET AND THE EXOTIC 1−+ MESON
Recently several experimental groups analysed data on πp → ηπp and πp → ηπn reactions with exotic 1 P -wave and found a conflicting evidence for an exotic meson I = 11(1405). High statistics data on these reactions are presently analysed by BNL E852 Collaboration. All these analyses are based on the crucial assumption that the production amplitudes do not depend on nucleon spin. This assumption...
متن کاملExotic hybrid mesons in hard electroproduction
We estimate the sizeable cross section for deep exclusive electroproduction of an exotic J = 1 hybrid meson in the Bjorken regime. The production amplitude scales like the one for usual meson electroproduction, i.e. as 1/Q. This is due to the non-vanishing leading twist distribution amplitude for the hybrid meson, which may be normalized thanks to its relation to the energy momentum tensor and ...
متن کاملPhoto - Excitation of Hyperons and Exotic Baryon in Γn → Kkn ∗
We investigate the reaction of γN → KKN focusing on the photoproduction of Λ(1520) and putative exotic Θ(1540). We consider various background production mechanisms including the production of vector mesons, tensor mesons, and other Λ and Σ hyperons. We discuss the angular distribution of Λ(1520) photoproduc-tion cross section and the radiative decays of Λ(1520). We also discuss what we expect ...
متن کاملCharge exchange ρπ photoproduction and implications for searches of exotic meson
We analyze the processes ~γ + p → ρ0π+n at low momentum transfer focusing on a possibility of production of an exotic JPC = 1−+ meson state. In particular we discuss polarization observables and conclude that linear photon polarization is instrumental for separating of the exotic wave. PACS number(s): 12.39.Mk, 12.40.Nn, 13.60.Le, 13.88+e
متن کامل