About: Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions

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About: Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Exclusive production of the isoscalar vector mesons ω and ϕ is measured with a 190 GeV/c190 GeV/c proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable xFxF of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xFxF and on the invariant mass MpVMpV of the system formed by fast proton pfastpfast and vector meson V is discussed in terms of diffractive production of pfastVpfastV resonances in competition with central production. The measurement of the spin density matrix element ρ00ρ00 of the vector mesons in different selected reference frames provides another handle to distinguish the contributions of these two major reaction types. Again, dependences of the alignment on xFxF and on MpVMpV are found. Most of the observations can be traced back to the existence of several excited baryon states contributing to ω production which are absent in the case of the ϕ meson. Removing the low-mass MpVMpV resonant region, the OZI rule is found to be violated by a factor of eight, independently of xFxF. Exclusive production of the isoscalar vector mesons ω and ϕ is measured with a 190 GeV/c190 GeV/c proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable xFxF of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xFxF and on the invariant mass MpVMpV of the system formed by fast proton pfastpfast and vector meson V is discussed in terms of diffractive production of pfastVpfastV resonances in competition with central production. The measurement of the spin density matrix element ρ00ρ00 of the vector mesons in different selected reference frames provides another handle to distinguish the contributions of these two major reaction types. Again, dependences of the alignment on xFxF and on MpVMpV are found. Most of the observations can be traced back to the existence of several excited baryon states contributing to ω production which are absent in the case of the ϕ meson. Removing the low-mass MpVMpV resonant region, the OZI rule is found to be violated by a factor of eight, independently of xFxF. (en)
Title	Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions (en)
skos:prefLabel	Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions (en)
skos:notation	RIV/68407700:21340/14:00218823!RIV15-MSM-21340___
http://linked.open...avai/riv/aktivita	I P S
http://linked.open...avai/riv/aktivity	I, P(LG13031), S
http://linked.open...iv/cisloPeriodika	září
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Virius, Miroslav Jarý, Vladimír Nový, Josef
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	České vysoké učení technické v Praze / Fakulta jaderná a fyzikálně inženýrská
http://linked.open...dnocenehoVysledku	46635
http://linked.open...ai/riv/idVysledku	RIV/68407700:21340/14:00218823
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Iizuka-Okubo-Zweig rule:violation; proto beam; vector meson; isoscalar; diffraction; spin:alignment; liquid target; ross section ratio; spin: density matrix (en)
http://linked.open.../riv/klicoveSlovo	diffraction Iizuka-Okubo-Zweig rule:violation isoscalar liquid target proto beam ross section ratio spin: density matrix spin:alignment vector meson
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[07C77A88772F]
http://linked.open...i/riv/nazevZdroje	Nuclear Physics B
http://linked.open...in/vavai/riv/obor	BF
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	209 (xsd:int)
http://linked.open...vavai/riv/projekt	Collaboration of the Czech Republic with CERN
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	886
http://linked.open...iv/tvurceVysledku	Virius, Miroslav Jarý, Vladimír Nový, Josef Adolph, C.
http://linked.open...ain/vavai/riv/wos	000341344500035
issn	0550-3213
number of pages	24 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.nuclphysb.2014.07.020
http://localhost/t...ganizacniJednotka	21340

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