%0 Conference Paper
%A Schönning, Karin
%T The OZI Rule and Spin Alignment of Vector Mesons at COMPASS
%N DESY-PROC-2014-04
%C Hamburg
%I Deutsches Elektronen-Synchrotron, DESY
%M PUBDB-2015-05678
%M DESY-PROC-2014-04
%P 165-168
%D 2014
%X The reaction p p → p V p (V = ω, ϕ) has been studied with the COMPASS spectrometer in 2008 and 2009, using a 190 GeV/c proton beam impinging on a liquid hydrogen target.The measured cross section ratio ratio violates the OZI prediction by a factor of  ≈ 4. Its kinematic dependence of the Feynman x<sub>F</sub> and the M<sub>pV</sub> mass is discussed in terms of diffractive production of baryon resonances in competition with central production. The M<sub>pω</sub> spectrum has a rich structure, indicating the importance of baryon resonances decaying into pω, in sharp contrast to the structureless M<sub>pϕ</sub> spectrum. Outside the resonant region, the OZI violation factor is about 8, independently of x<sub>F</sub>.The spin density matrix element ρ<sub>00</sub> of the vector mesons is studied in selected reference frames. Dependences of the vector meson spin alignment on x<sub>F</sub> and M<sub>pV</sub> are found.
%B Panic2014
%C 25 Aug 2014 - 29 Aug 2014, Hamburg (Germany)
Y2 25 Aug 2014 - 29 Aug 2014
M2 Hamburg, Germany
%K spin: alignment (autogen)
%K p: beam (autogen)
%K baryon resonance: production (autogen)
%K spin: density matrix (autogen)
%K Iizuka-Okubo-Zweig rule: violation (autogen)
%K cross section: ratio: measured (autogen)
%K hydrogen: liquid: target (autogen)
%K diffraction: production (autogen)
%K vector meson (autogen)
%K COMPASS (autogen)
%K spectrometer (autogen)
%K kinematics (autogen)
%K structure (autogen)
%K Feynman (autogen)
%F PUB:(DE-HGF)8 ; PUB:(DE-HGF)15
%9 Contribution to a conference proceedingsInternal Report
%R 10.3204/DESY-PROC-2014-04/36
%U https://bib-pubdb1.desy.de/record/291944