2005
DOI: 10.1088/0954-3899/31/7/010
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Azimuthal asymmetries in unpolarized Drell–Yan events on nuclear targets

Abstract: We show that for Drell-Yan events by unpolarized hadronic projectiles and nuclear targets, azimuthal asymmetries can arise from the nuclear distortion of the hadronic projectile wave function, typically a spin-orbit effect occurring on the nuclear surface. The asymmetry depends on quantities that enter also the spin asymmetry in the corresponding Drell-Yan event on polarized free nucleonic targets. Hence, this study can be of help in exploring the spin structure of the nucleon, in particular the transverse spi… Show more

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Cited by 7 publications
(8 citation statements)
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References 43 publications
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“…The second one involves the transversity distribution h 1 and the Boer-Mulders function h ⊥ 1 , a TMD distribution which is most likely responsible for the violation of the Lam-Tung sum rule in the corresponding anomalous cos 2φ asymmetry of the unpolarized Drell-Yan cross section [15]. Hence, a simultaneous measurement of unpolarized and single-polarized Drell-Yan cross sections would allow to extract all the unknowns from data [17,18]. Both h 1 and h ⊥ 1 describe the distribution of transversely polarized partons; but the former applies to transversely polarized parent hadrons, while the latter to unpolarized ones.…”
Section: Introductionmentioning
confidence: 99%
“…The second one involves the transversity distribution h 1 and the Boer-Mulders function h ⊥ 1 , a TMD distribution which is most likely responsible for the violation of the Lam-Tung sum rule in the corresponding anomalous cos 2φ asymmetry of the unpolarized Drell-Yan cross section [15]. Hence, a simultaneous measurement of unpolarized and single-polarized Drell-Yan cross sections would allow to extract all the unknowns from data [17,18]. Both h 1 and h ⊥ 1 describe the distribution of transversely polarized partons; but the former applies to transversely polarized parent hadrons, while the latter to unpolarized ones.…”
Section: Introductionmentioning
confidence: 99%
“…Next, we evolve these distributions from Q 2 0 = 0.1 GeV 2 to Q 2 = 16 GeV 2 with a (polarized) DGLAP NLO kernel. Then, we fit each result with different 3-parameter forms N i x αi (1 − x) βi , i = 1 − 3, and we replace them in the corresponding x-dependent part of the parametrizations (16) and (26). The calculation of c BM 3 then develops in the same way up to the first line of Eq.…”
Section: The Boer-mulders Effectmentioning
confidence: 99%
“…The second one involves the yet poorly known transversity distribution h 1 and the Boer-Mulders function h ⊥ 1 , a TMD distribution which is most likely responsible for the violation of the previously mentioned Lam-Tung sum rule [23]. Hence, a simultaneous measurement of unpolarized and single-polarized Drell-Yan cross sections would allow to extract all the above partonic densities from data [25,26]. Both h 1 and h ⊥ 1 describe the distribution of transversely polarized partons; but the former applies to transversely polarized parent hadrons, while the latter to unpolarized ones.…”
Section: Introductionmentioning
confidence: 99%
“…The model yields a nontrivial time evolution of vertices' properties and scale-free behavior for the weight, strength, and degree distributions. In the paper [19], Bianconi has presented a model with co-evolution of link weight and strength. In his weighted fitness network model, the fitness of node and link and results in the structural phase transition of the network are introduced.…”
Section: Introductionmentioning
confidence: 99%