TY  - CONF
AU  - Schönning, Karin
TI  - The OZI Rule and Spin Alignment of Vector Mesons at COMPASS
IS  - DESY-PROC-2014-04
CY  - Hamburg
PB  - Deutsches Elektronen-Synchrotron, DESY
M1  - PUBDB-2015-05678
M1  - DESY-PROC-2014-04
SP  - 165-168
PY  - 2014
AB  - 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.
T2  - Panic2014
CY  - 25 Aug 2014 - 29 Aug 2014, Hamburg (Germany)
Y2  - 25 Aug 2014 - 29 Aug 2014
M2  - Hamburg, Germany
KW  - spin: alignment (autogen)
KW  - p: beam (autogen)
KW  - baryon resonance: production (autogen)
KW  - spin: density matrix (autogen)
KW  - Iizuka-Okubo-Zweig rule: violation (autogen)
KW  - cross section: ratio: measured (autogen)
KW  - hydrogen: liquid: target (autogen)
KW  - diffraction: production (autogen)
KW  - vector meson (autogen)
KW  - COMPASS (autogen)
KW  - spectrometer (autogen)
KW  - kinematics (autogen)
KW  - structure (autogen)
KW  - Feynman (autogen)
LB  - PUB:(DE-HGF)8 ; PUB:(DE-HGF)15
DO  - DOI:10.3204/DESY-PROC-2014-04/36
UR  - https://bib-pubdb1.desy.de/record/291944
ER  -