Nucleon strangeness polarization from $$\varLambda /\bar{\varLambda }$$ hyperon production in polarized proton–proton collision at RHIC

Liu, Xiaonan; Ma, Bo-Qiang

doi:10.1140/epjc/s10052-019-6916-z

Cited by 8 publications

(5 citation statements)

References 83 publications

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“…These experiments also suggest a strange quark contribution to the intrinsic spin, ΔΣ s þ . Phenomenological analyses point to a negative value but the error is large, giving values of ΔΣ s þ ranging from −0.120ð81Þ [10,14,16,17] to −0.026ð22Þ [18]. We use the shorthand notation q þ ¼ q þq to denote the sum from quark and antiquark contributions to the intrinsic spin and momentum fraction.…”

Section: Introductionmentioning

confidence: 99%

Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass

et al. 2020

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We evaluate the gluon and quark contributions to the spin of the proton using an ensemble of gauge configurations generated at physical pion mass. We compute all valence and sea quark contributions to high accuracy. We perform a nonperturbative renormalization for both quark and gluon matrix elements. We find that the contribution of the up, down, strange, and charm quarks to the proton intrinsic spin is 1 2 P q¼u;d;s;c ΔΣ q þ ¼ 0.191ð15Þ and to the total spin P q¼u;d;s;c J q þ ¼ 0.285ð45Þð10Þ. The gluon contribution to the spin is J g ¼ 0.187ð46Þð10Þ yielding J ¼ J q þ J g ¼ 0.473ð71Þð14Þ confirming the spin sum. The momentum fraction carried by quarks in the proton is found to be 0.618(60) and by gluons 0.427(92), the sum of which gives 1.045(118) confirming the momentum sum rule. All scale and scheme dependent quantities are given in the MS scheme at 2 GeV.

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Section: Introductionmentioning

confidence: 99%

Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass

et al. 2020

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“…Note that the ρϕ channel cross section is expected to be very small, vanishing if the strange sea of the nucleon is symmetric (see however Refs. [28,29]).…”

Section: A Isospin Relationsmentioning

confidence: 99%

Diffractive two-meson electroproduction with a nucleon and deuteron target

2020

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The diffractive electro-or photoproduction of two mesons separated by a large rapidity gap gives access to generalized parton distributions (GPDs) in a very specific way. First, these reactions allow us to easily access the chiral-odd transversity quark GPDs by selecting one of the produced vector mesons to be transversely polarized. Second, they are only sensitive to the so-called Efremov-Radyushkin-Brodsky-Lepage region where GPDs are not much constrained by forward quark distributions. Third, the skewness parameter ξ is not related to the Bjorken x Bj variable, but to the size of the rapidity gap. We analyze different channels (ρ 0 L ρ L=T , ρ 0 L ω L=T and ρ 0 L π production) on nucleon and deuteron targets. The analysis is performed in the kinematical domain where a large momentum transfer from the photon to the diffractively produced vector meson introduces a hard scale (the virtuality of the exchanged hard Pomeron). This enables the description of the hadronic part of the process in the framework of collinear factorization of GPDs. We show that the unpolarized cross sections depend very much on the parametrizations of both chiral-even and chiral-odd quark distributions of the nucleon, as well as on the shape of the meson distribution amplitudes. The rates are shown to be in the range of the capacities of a future electron-ion collider.

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“…Note that the ρφ channel cross section is expected to be very small, vanishing if the strange sea of the nucleon is symmetric (see however Refs. [28,29]).…”

Section: Considered Reactions and Model Inputs A Isospin Relationsmentioning

confidence: 99%

Diffractive two-meson electroproduction with a nucleon and deuteron target

Cosyn,

Pire,

Szymanowski

2020

Preprint

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Nucleon strangeness polarization from $$\varLambda /\bar{\varLambda }$$ hyperon production in polarized proton–proton collision at RHIC

Cited by 8 publications

References 83 publications

Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass

Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass

Diffractive two-meson electroproduction with a nucleon and deuteron target

Diffractive two-meson electroproduction with a nucleon and deuteron target

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