Polarization observables in the reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mi>NN</mml:mi><mml:mi>φ</mml:mi></mml:math>

Титов, А. И.; Kämpfer, B.; Shklyar, V.

doi:10.1103/physrevc.59.999

Cited by 20 publications

(29 citation statements)

References 34 publications

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“…(25) in Ref. [9]. The above equations lead to the ratio f 0 /f 1 = 3 and to the ratio of singlet to triplet cross sections…”

Section: A Fixing Parametersmentioning

confidence: 99%

“…1 In [9] we used a convention with ξ 2 pn = ξ 4 pn = 2, which, however, does not change our threshold prediction for the ratio of the total cross sections in pn and pp interaction made there without the final state interactions.…”

Section: Basic Amplitudesmentioning

confidence: 99%

“…The spin density defines the angular distribution in φ → e + e − and φ → K + K − decays, which has a simple form in a system where the φ meson is at rest (for details see [9]). The decay angles Θ, Φ are defined as polar and azimuthal angles of the direction of flight of one of the decay particles in the φ meson's rest frame.…”

Section: Observablesmentioning

confidence: 99%

“…The early theoretical studies [8,9] show, indeed, that predictions for hadronic observables are very sensitive to the parameters of the monopole form factors which can not be fixed unambiguously without adjustments relying on the corresponding experimental data. In our case one can rely on the recent measurement of the ratio of the total cross sections of φ and ω production in pp reactions studied by the DISTO Collaboration at SATURNE at T lab = 2.85 GeV as well as on the φ angular distribution in the pp → ppφ reaction [10] and on the total cross section [11].…”

Section: Introductionmentioning

confidence: 99%

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Production of φ mesons in near-threshold π

Титов¹,

Kämpfer²,

Reznik³

2000

EPJ A

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We analyze the production of φ mesons in πN and N N reactions in the nearthreshold region, using throughout the conventional "non-strange" dynamics based on such processes which are allowed by the non-ideal ω − φ mixing.We show that the occurrence of the direct φN N interaction may show up in different unpolarized and polarization observables in πN → N φ reactions.We find a strong non-trivial difference between observables in the reactions pp → ppφ and pn → pnφ caused by the different role of the spin singlet and triplet states in the entrance channel. A series of predictions for the experimental study of this effect is presented.

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“…(25) in Ref. [9]. The above equations lead to the ratio f 0 /f 1 = 3 and to the ratio of singlet to triplet cross sections…”

Section: A Fixing Parametersmentioning

confidence: 99%

Section: Basic Amplitudesmentioning

confidence: 99%

Section: Observablesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Production of φ mesons in near-threshold π

Титов¹,

Kämpfer²,

Reznik³

2000

EPJ A

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“…We may refer [10] for modifications of the rule. Apart from looking for the strange quark content of the nucleon in the initial state, attention has also been focused on resonance contributions [11,12,13] to vector meson production in N N collisions. The constituent quark models [14] predict highly excited N * states which have not been seen in πN scattering.…”

mentioning

confidence: 99%

ω production inppcollisions

et al. 2005

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A model-independent irreducible tensor formalism which has been developed earlier to analyze measurements of p p → pp π• , is extended to present a theoretical discussion of p p → pp ω and of ω polarization in pp → pp ω and in p p → pp ω. The recent measurement of unpolarized differential cross section for pp → pp ω is analyzed using this theoretical formalism.PACS numbers: 13.75. Cs, 13.88.+e, 24.70.+s, 25.40.Ve Experimental study of meson production in N N collisions has attracted considerable interest during the last decade and a half. The early measurements of total crosssection [1] for pion production were found surprisingly to be more than a factor of 5 than the theoretical predictions [2]. At c.m. energies close to threshold, the relative kinetic energies between the particles in the final state are small and an analysis involves, therefore, only a few partial waves. On the other hand, a large momentum transfer is involved when an additional particle is produced in the final state, thus making the reaction sensitive to the features of the N N interaction at short distances where the nucleons start to overlap. When a heavier meson like ω is produced, the overlapping region corresponds [3] to a distance of about 0.2f m. It is also known that the short range part of the N N interaction is dominated by the ω exchange [4]. Consequently, a variety of theoretical models have been proposed [5] not only to bridge the gap between theory and experiment, but also to test results of QCD based discussions of the N N interaction. According to the OZI rule [6], φ production relative to ω production is suppressed in the absence of strange quarks in the initial state. This ratio R has been measured [7], in view of the dramatic violations [8] observed inpp collisions, and compared to the theoretical estimate [9] of 4.2×10 −3 after correcting for the available phase space. We may refer [10] for modifications of the rule. Apart from looking for the strange quark content of the nucleon in the initial state, attention has also been focused on resonance contributions [11,12,13] to vector meson production in N N collisions. The constituent quark models [14] predict highly excited N * states which have not been seen in πN scattering. This " missing resonance problem " [15] has also catalyzed the experimental study of ω meson production in the hope that the missing resonances may couple more strongly or even exclusively to the ωN channel in comparison to the πN channel, although ωN decay modes of resonances have not been observed [16]. Also the cross-sections of vector meson production enter as inputs into transport models for dilepton emission in heavy ion collisions which may in turn be used to study the off-shell ω production and medium modifications of the widths and masses of the resonances [13].Meson production in N N collisions involves also spin state transitions of the N N system, which do not occur in elastic N N scattering. In pp → ppπ 0 , for example, the transition of the pp system at threshold is from an initial sp...

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

Adolph¹,

Akhunzyanov²,

Alexeev

et al. 2014

Nuclear Physics B

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Exclusive production of the isoscalar vector mesons ωand φis measured with a 190GeV/cproton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable xFof the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xFand on the invariant mass MpVof the system formedby fast proton pfastand vector meson Vis discussed in terms of diffractive production of pfastVresonances in competition with central production. The measurement of the spin density matrix element ρ00of 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 xFand on MpVare found. Most of the observations can be traced back to the existence of several excited baryon states contributing to ωproduction which are absent in the case of the φmeson. Removing the low-mass MpVresonant region, the OZI rule is found to be violated by a factor of eight, independently of xF

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Polarization observables in the reactionNN→NNφ

Cited by 20 publications

References 34 publications

Production of φ mesons in near-threshold π

Production of φ mesons in near-threshold π

ω production inppcollisions

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

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