Neutral-strange-particle production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi /><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ne</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>20</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>pN</mml:mi></mml:math>interactions at 300 GeV

Yuldashev, B. S.; Aliev, Sh.; Alimov, M. A.; Artykov, Kh. Kh.; Edgorov, S.O.; Inogamov, Sh.V.; Khaneles, A. V.; Kosonowski, E. A.; Lutpullaev, S. L.; Rasulov, N.; Rodionova, T. P.; Turdaliev, K.T.; Turumov, E.; Yuldashev, A. A.; Loveless, R.; Reeder, D.

doi:10.1103/physrevd.43.2792

Cited by 20 publications

(11 citation statements)

References 40 publications

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“…The one measured first was the transverse SSA in processes like pp → Λ ↑ X, which in collinear twist-3 factorization involve twist-3 FFs. For some time it has been observed that hyperons produced in unpolarized hadronic collisions exhibit sizable asymmetries towards large x F values [585,586,587,588,589,590,591,592,593], similar to the transverse SSAs discussed in Sec. 4.5.4.…”

Section: Ffs For Polarized Hadronsmentioning

confidence: 67%

Parton fragmentation functions

Metz

Vossen

2016

Progress in Particle and Nuclear Physics

187

169

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The field of fragmentation functions of light quarks and gluons is reviewed. In addition to integrated fragmentation functions, attention is paid to the dependence of fragmentation functions on transverse momenta and on polarization degrees of freedom. Higher-twist and di-hadron fragmentation functions are considered as well. Moreover, the review covers both theoretical and experimental developments in hadron production in electron-positron annihilation, deep-inelastic lepton-nucleon scattering, and proton-proton collisions.

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Section: Ffs For Polarized Hadronsmentioning

confidence: 67%

Parton fragmentation functions

Metz

Vossen

2016

Progress in Particle and Nuclear Physics

187

169

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“…Fig. 3 contains the Λ/Σ 0 ratio observed in p Be (open triangle) [28] and p Ne (open circle) [29] collisions. The open square is a very recent result [30] from the STAR Collaboration at RHIC obtained for d Au collisions at √ s=200 GeV.…”

Section: Pacs 1375ev Hyperon-nucleon Interactions -1420jn Hyperomentioning

confidence: 99%

“…[25]. The open triangle and open circle are ratios measured in p Be [28] and p Ne [29] collisions, respectively. The open square is the result from a d Au experiment [30].…”

Section: Pacs 1375ev Hyperon-nucleon Interactions -1420jn Hyperomentioning

confidence: 99%

Phenomenology of the Λ/Σproduction ratio in pp collisions

et al. 2006

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Abstract. We show that the recently measured asymmetry in helicity-angle spectra of the Λ-hyperons produced in the reaction pp→K + Λp reaction and the energy dependence of the total pp→K + Λp cross section can be explained consistently by the same Λp final-state interaction. Assuming that there is no final-state interaction in the Σ 0 p channel, as suggested by the available data, we can also reproduce the energy dependence of the Λ/Σ 0 production ratio and, in particular, the rather large ratio observed near the reaction thresholds. The nominal ratio of the Λ and Σ 0 production amplitudes squared, i.e. when disregarding the final-state interaction, turns out to be about 3, which is in line with hyperon production data from proton and nuclear targets available at high energies. One of the surprising results observed at the COSY accelerator facility is the large ratio of the pp→K + Λp to pp→K + Σ 0 p cross sections near the reaction thresholds [1,2]. This ratio is as large as 28 [1] at very low energies and eventually approaches values around 3 with increasing energy. In the last few years several theoretical studies [3,4,5,6,7,8] appeared where different production scenarios were considered in order to describe simultaneously both the pp→K + Λp and pp→K + Σ 0 p reaction cross sections and, thus, the Λ/Σ 0 ratio. These included π, K as well as heavier meson exchanges, intermediate baryonic resonances coupled to the K + Λ and K + Σ 0 channels as well as the Λp and Σ 0 p final-state interaction (FSI). But, as summarized in Refs. [2,9], none of these models is able to reproduce the energy dependence of the Λ/Σ 0 ratio convincingly. A basic problem is that the relevance of the FSI on one hand side, and the interplay between the different baryonic resonances on the other side can not be resolved from considering only the total reaction cross section. Therefore, in the present paper we follow a different strategy. We look not only at the total cross sections but also at differential observables because some of them do allow to distinguish between effects from the FSI and baryonic resonances, as we pointed out recently [10]. Moreover, for the reaction pp→K + Λp data for the relevant observables are already available in the literature [11]. Note that our study is completely phenomenological in the sense that we do not consider any specific reaction mechanism. But we take into account the effects from the Λp final-state interaction. We will argue that the differential data of Ref. PACS[11] strongly support the interpretation of the measured energy-dependence of the total pp→K + Λp cross section in terms of FSI effects. At the same time, and in view of the lack of any visible FSI effects in the reaction pp→K, we come to the conclusion that the energy-dependence of the Λ/Σ 0 cross section ratio could likewise be governed primarily by FSI effects in the pp→K + Λp channel. The role of the Λp FSI in describing the pp→K + Λp cross section near the reaction threshold was already addressed after the first experiments of the COSY-...

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“…Specifically, when colliding protons with a beryllium target and detecting Λ hyperons, it was found that the Λ's show a transverse polarization asymmetry (often denoted as A N ), which is largest (up to 30%) for polarization perpendicular to the reaction plane and vanishes in the reaction plane [1]. This pioneering measurement was followed by a number of corresponding experiments which, in particular, also covered different kinematic ranges [2][3][4][5][6][7][8][9][10][11]. Some of the earlier data are reviewed in [12,13].…”

Section: Introductionmentioning

confidence: 99%

Twist-3 fragmentation contribution to polarized hyperon production in unpolarized hadronic collisions

Koike¹,

Metz

Pitonyak

et al. 2017

Phys. Rev. D

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It has been known for a long time that hyperons produced in hadronic collisions are polarized perpendicular to the production plane of the reaction. This effect cannot be described by using twist-2 collinear parton correlators only. Here we compute the contribution of twist-3 fragmentation functions to the production of transversely polarized hyperons in unpolarized proton-proton collisions in the framework of collinear factorization. By taking into account the relations among the relevant twist-3 fragmentation functions which follow from the QCD equation of motion and the Lorentz invariance property of the correlators, we present the leading-order cross section for this term.

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Neutral-strange-particle production inpNe20andpNinteractions at 300 GeV

Cited by 20 publications

References 40 publications

Parton fragmentation functions

Parton fragmentation functions

Phenomenology of the Λ/Σproduction ratio in pp collisions

Twist-3 fragmentation contribution to polarized hyperon production in unpolarized hadronic collisions

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