000291944 001__ 291944
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000291944 0247_ $$2datacite_doi$$a10.3204/DESY-PROC-2014-04/36
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000291944 0881_ $$aDESY-PROC-2014-04
000291944 088__ $$2DESY$$aDESY-PROC-2014-04
000291944 1001_ $$aSchönning, Karin$$b0
000291944 1112_ $$aPanic2014$$cHamburg$$d2014-08-25 - 2014-08-29$$gPanic2014$$wGermany
000291944 245__ $$aThe OZI Rule and Spin Alignment of Vector Mesons at COMPASS
000291944 260__ $$aHamburg$$bDeutsches Elektronen-Synchrotron, DESY$$c2014
000291944 300__ $$a165-168
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000291944 520__ $$aThe reaction $p p \rightarrow p V p$ ($V$ = $\omega$, $\phi$) 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 $\approx$4. Its kinematic dependence of the Feynman $x_F$ and the $M_{pV}$ mass is discussed in terms of diffractive production of baryon resonances in competition with central production. The $M_{p\omega}$ spectrum has a rich structure, indicating the importance of baryon resonances decaying into $p\omega$, in sharp contrast to the structureless $M_{p\phi}$ spectrum. Outside the resonant region, the OZI violation factor is about 8, independently of $x_F$.The spin density matrix element $\rho_{00}$ of the vector mesons is studied in selected reference frames. Dependences of the vector meson spin alignment on $x_F$ and $M_{pV}$ are found.
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000291944 650_7 $$2autogen$$aspin: alignment
000291944 650_7 $$2autogen$$ap: beam
000291944 650_7 $$2autogen$$abaryon resonance: production
000291944 650_7 $$2autogen$$aspin: density matrix
000291944 650_7 $$2autogen$$aIizuka-Okubo-Zweig rule: violation
000291944 650_7 $$2autogen$$across section: ratio: measured
000291944 650_7 $$2autogen$$ahydrogen: liquid: target
000291944 650_7 $$2autogen$$adiffraction: production
000291944 650_7 $$2autogen$$avector meson
000291944 650_7 $$2autogen$$aCOMPASS
000291944 650_7 $$2autogen$$aspectrometer
000291944 650_7 $$2autogen$$akinematics
000291944 650_7 $$2autogen$$astructure
000291944 650_7 $$2autogen$$aFeynman
000291944 693__ $$0EXP:(DE-MLZ)NOSPEC-20140101$$5EXP:(DE-MLZ)NOSPEC-20140101$$eNo specific instrument$$x0
000291944 7001_ $$0P:(DE-HGF)0$$aCOMPASS Collaboration$$b1$$eCollaboration Author
000291944 773__ $$a10.3204/DESY-PROC-2014-04/36
000291944 7870_ $$0PUBDB-2015-03603$$aSchmidt, Alexander et.al.$$dHamburg : Deutsches Elektronen-Synchrotron, DESY, Hamburg, 2014$$iIsPartOf$$rDESY-PROC-2014-04$$tProceedings, 20th International Conference on Particles and Nuclei (PANIC 14)
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