Transverse spin observables in hard-scattering hadronic processes within collinear factorization

Pitonyak, Daniel

doi:10.1142/s0217751x16300490

Cited by 20 publications

(20 citation statements)

References 223 publications

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“…Let us first review the current situation for this observable, which receives contributions from all three terms in Eq. (1). That is, the full result involves twist-3 functions from (i) the transversely polarized proton, (ii) the unpolarized proton, and (iii) the (unpolarized) final-state pion.…”

Section: Introductionmentioning

confidence: 99%

Phenomenological constraints on A in p↑p→πX from Lorentz invariance relations

et al. 2017

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We present a new analysis of A N in p ↑ p → π X within the collinear twist-3 factorization formalism. We incorporate recently derived Lorentz invariance relations into our calculation and focus on input from the kinematical twist-3 functions, which are weighted integrals of transverse momentum dependent (TMD) functions. In particular, we use the latest extractions of the Sivers and Collins functions with TMD evolution to compute certain terms in A N . Consequently, we are able to constrain the remaining contributions from the lesser known dynamical twist-3 correlators. (Daniel Pitonyak), prokudin@jlab.org (Alexei Prokudin) 1 One could also have C transversely polarized instead of A.2 Studies of the contribution to A N from the convolution of the transversity and Collins TMD functions in the framework of the so-called Generalized Parton Model are presented in Ref. [58]. 3 The dynamical FFs are complex, and we indicate their real and imaginary parts by and superscripts, respectively. 4 Of course there are still uncertainties in these TMD inputs because they are not well-constrained in the forward x F region where A N is large. 5 Note from our discussion before that we can never write the entire cross section only in terms of kinematical functions.

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Section: Introductionmentioning

confidence: 99%

Phenomenological constraints on A in p↑p→πX from Lorentz invariance relations

et al. 2017

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“…We refer the reader to Ref. [56] for a more comprehensive review of this topic. In the collinear twist-3 approach, one writes the differential cross section for p ↑ p → C X as…”

Section: Ssas Within Collinear Factorizationmentioning

confidence: 99%

Connections between TMDs and collinear twist-3 functions within the context of single-spin asymmetries

Pitonyak

Metz

Prokudin³

2018

Proceedings of QCD Evolution 2017 — PoS(QCDEV2017)

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We review the theoretical framework underlying the description of transverse single-spin asymmetries (SSAs) for both collinear and transverse-momentum-dependent (TMD) processes. For the latter, we discuss modifications to the widely used CSS formalism that are needed to address certain issues that have arisen in TMD analyses. After these improvements, one can derive rigorous relations between collinear and TMD functions. Moreover, we show how both collinear and TMD SSA observables are driven by multi-parton correlations, which allows for a future global extraction to be performed including data from both types of measurements.

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“…[12](see recent reviews Refs. [40,41]). In order to take into account multiple gluon rescattering effect on target side, the similar hybrid approach also can be applied in the fragmentation case [37].…”

Section: The Computation Ofmentioning

confidence: 99%

Single spin asymmetries in forward p−p/A collisions revisited: The role of color entanglement

Zhou

2017

Phys. Rev. D

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We calculate the single transverse spin asymmetries(SSA) for forward inclusive particle production in pp and pA collisions using a hybrid approach. It is shown that the Sivers type contribution to the SSA drops out due to color entanglement effect, whereas the fragmentation contribution to the spin asymmetry is not affected by color entanglement effect. This finding offers a natural solution for the sign mismatch problem.PACS numbers: Keywords:I. Introduction. -During the past three decades, the studies of transverse single spin asymmetries in high energy scatterings have greatly deepened our understanding of some central aspects of Quantum Chromodynamics(QCD) factorization theorem, among which the universality issue attracted a lot of attentions. Within transverse momentum dependent(TMD) factorization framework [1], a TMD distribution, known as the Sivers function f ⊥ 1T [2] was proposed to account for the observed large SSAs. It has been found that the Sivers function reverses sign between the semi-inclusive deeply inelastic scattering(SIDIS) and the Drell-Yan process [3][4][5]. The discovery of such novel and unique universality property has stimulated a lot of theoretical progress over the past decade. The preliminary results from the STAR collaboration and the COMPASS collaboration [6,7] seem to confirm the sign change. This is undoubtedly one of the most remarkable achievements in high energy spin physics.However, the situation with the SSA for the forward inclusive hadron production in pp collisions(denoted as A N ) p ↑ p → hX is more complicated. Due to the lack of an additional hard scale, it is more appropriate to compute this observable using the collinear twist-3 approach [8][9][10][11][12] instead of TMD factorization. Phenomenologically, it was also studied in the generalized parton model [13,14]. The twist-3 effects leading to the SSA can be factorized into various three-parton correlation functions. One of these is the Qiu-Sterman function T F [9] which can be related to the Sivers function [15],

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Transverse spin observables in hard-scattering hadronic processes within collinear factorization

Cited by 20 publications

References 223 publications

Phenomenological constraints on A in p↑p→πX from Lorentz invariance relations

Phenomenological constraints on A in p↑p→πX from Lorentz invariance relations

Connections between TMDs and collinear twist-3 functions within the context of single-spin asymmetries

Single spin asymmetries in forward p−p/A collisions revisited: The role of color entanglement

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