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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F14%3A10284906%21RIV15-MSM-11320___
rdf:type
n10:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1016/j.nuclphysb.2014.07.020
dcterms:description
Exclusive production of the isoscalar vector mesons omega and phi is measured with a 190 GeV/c proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable x(F) of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xF and on the invariant mass M-pV of the system formed by fast proton p(fast) and vector meson V is discussed in terms of diffractive production of p(fast) V resonances in competition with central production. The measurement of the spin density matrix element rho(00) 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 x(F) and on M-pV are found. Most of the observations can be traced back to the existence of several excited baryon states contributing to omega production which are absent in the case of the phi meson. Removing the low-mass M-pV resonant region, the OZI rule is found to be violated by a factor of eight, independently of x(F). (C) 2014 CERN for the benefit of the COMPASS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). Exclusive production of the isoscalar vector mesons omega and phi is measured with a 190 GeV/c proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable x(F) of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xF and on the invariant mass M-pV of the system formed by fast proton p(fast) and vector meson V is discussed in terms of diffractive production of p(fast) V resonances in competition with central production. The measurement of the spin density matrix element rho(00) 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 x(F) and on M-pV are found. Most of the observations can be traced back to the existence of several excited baryon states contributing to omega production which are absent in the case of the phi meson. Removing the low-mass M-pV resonant region, the OZI rule is found to be violated by a factor of eight, independently of x(F). (C) 2014 CERN for the benefit of the COMPASS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/).
dcterms:title
Spin alignment and violation of the OZI rule in exclusive omega and phi production in pp collisions Spin alignment and violation of the OZI rule in exclusive omega and phi production in pp collisions
skos:prefLabel
Spin alignment and violation of the OZI rule in exclusive omega and phi production in pp collisions Spin alignment and violation of the OZI rule in exclusive omega and phi production in pp collisions
skos:notation
RIV/00216208:11320/14:10284906!RIV15-MSM-11320___
n3:aktivita
n9:P
n3:aktivity
P(LG13031), P(LO1212)
n3:cisloPeriodika
September
n3:dodaniDat
n12:2015
n3:domaciTvurceVysledku
n4:9679707 n4:9376062 n4:6050816 n4:3967379
n3:druhVysledku
n14:J
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
46636
n3:idVysledku
RIV/00216208:11320/14:10284906
n3:jazykVysledku
n17:eng
n3:klicovaSlova
pi; nucleon; polarization; selection rule; experimental tests; meson production; zweig-iizuka rule; low-energy photoproduction; proton-proton collisions
n3:klicoveSlovo
n5:zweig-iizuka%20rule n5:meson%20production n5:proton-proton%20collisions n5:low-energy%20photoproduction n5:experimental%20tests n5:nucleon n5:polarization n5:selection%20rule n5:pi
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[72015CF17C63]
n3:nazevZdroje
Nuclear Physics B
n3:obor
n6:BF
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
209
n3:projekt
n18:LG13031 n18:LO1212
n3:rokUplatneniVysledku
n12:2014
n3:svazekPeriodika
886
n3:tvurceVysledku
Boer, M. Bedfer, Y. Bernhard, J. Bordalo, P. Alexeev, M. G. Finger, Miroslav Sulc, M. Srnka, A. Bisplinghoff, J. Slunecka, M. Virius, M. Badelek, B. Alexeev, G. D. Anosov, V. Adolph, C. Andrieux, V. Jary, V. Matoušek, Jan Bodlák, Martin Finger, Michael Steiger, L. Bressan, A. Bradamante, F. Novy, J.
n3:wos
000341344500035
s:issn
0550-3213
s:numberOfPages
24
n15:doi
10.1016/j.nuclphysb.2014.07.020
n8:organizacniJednotka
11320