Three-gluon contribution to the single spin asymmetry for light hadron production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math>collision

Beppu, Hiroo; Kanazawa, Koichi; Koike, Yasuhiro; Yoshida, Shinsuke

doi:10.1103/physrevd.89.034029

Cited by 46 publications

(59 citation statements)

References 42 publications

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“…Much theoretical work has been performed over the years to develop the collinear twist-3 formalism needed to describe these proton-proton SSAs [14][15][16][17][19][20][21][22][23][24][25][26][27][28][29][30][31] and DSAs [32][33][34][35][36][37][38], including recent extensions to include fragmentation effects [26,27,29,30,38] and tri-gluon correlations [31,37,[39][40][41][42]. Nevertheless, whether this framework can provide a * tuf29138@temple.edu † koike@phys.sc.niigata-u.ac.jp ‡ metza@temple.edu § dpitonyak@quark.phy.bnl.gov ¶ marc.schlegel@uni-tuebingen.de definitive explanation of these observables (especially SSAs) remains an open question.…”

Section: Introductionmentioning

confidence: 99%

Operator constraints for twist-3 functions and Lorentz invariance properties of twist-3 observables

et al. 2016

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We investigate the behavior under Lorentz tranformations of perturbative coefficient functions in a collinear twist-3 formalism relevant for high-energy observables including transverse polarization of hadrons. We argue that those perturbative coefficient functions can, a priori, acquire quite different yet Lorentz-invariant forms in various frames. This somewhat surprising difference can be traced back to a general dependence of the perturbative coefficient functions on lightcone vectors which are introduced by the twist-3 factorization formulae and which are frame-dependent. One can remove this spurious frame dependence by invoking so-called Lorentz invariance relations (LIRs) between twist-3 parton correlation functions. Some of those relations for twist-3 distribution functions were discussed in the literature before. In this paper we derive the corresponding LIRs for twist-3 fragmentation functions. We explicitly demonstrate that these LIRs remove the lightcone vector dependence by considering transverse spin observables in the single-inclusive production of hadrons in leptonnucleon collisions, N → hX. With the LIRs in hand, we also show that twist-3 observables in general can be written solely in terms of three-parton correlation functions.

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Section: Introductionmentioning

confidence: 99%

Operator constraints for twist-3 functions and Lorentz invariance properties of twist-3 observables

et al. 2016

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“…The first term in (1), where collinear twist-3 correlators appear for the transversely polarized proton, has been studied extensively. 5,[12][13][14]17,19 The second term in (1), which involves collinear twist-3 functions for the unpolarized proton, was shown to be small. 20 For the third term in (1), in which collinear twist-3 functions enter for the outgoing (unpolarized) hadron, the complete analytical result was obtained only recently.…”

Section: Collinear Twist-3 Formalismmentioning

confidence: 99%

“…Experimental measurements of TSSAs in single-inclusive hadron production in proton-(anti)proton collisions (denoted by A N ) continued to be sizable. [6][7][8][9][10] This led to much (still ongoing) theoretical work on these and similar observables -see, e.g., [4,5,[11][12][13][14][15][16][17]. In Sec.…”

Section: Introductionmentioning

confidence: 99%

Transverse Single-Spin Asymmetries in Proton-Proton Collisions Within Collinear Factorization

Pitonyak

Kanazawa

Koike

et al. 2015

Int. J. Mod. Phys. Conf. Ser.

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We provide a new analysis within collinear factorization of transverse single-spin asymmetries (TSSAs) in high transverse momentum charged and neutral pion production in pp collisions at the Relativistic Heavy Ion Collider (RHIC). This study incorporates the so-called twist-3 fragmentation term and shows that one can describe RHIC data through this mechanism. Moreover, by fixing other non-perturbative inputs through extractions of transverse momentum dependent functions in e + e − → h 1 h 2 X and semi-inclusive deep-inelastic scattering (SIDIS), we provide for the first time a consistency between certain spin/azimuthal asymmetries in all three reactions (i.e., pp, e + e − , and SIDIS).

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“…In the 1990s this CT3 approach was worked out in more detail for proton-proton collisions [16,17,18,19]. Over the last decade, several other analyses furthered the development of this formalism -see [20,21,22,23,24,25,26,27,28,29] and references therein. Nevertheless, also in the 1990s it was put forth that these TSSAs had another origin due to the transverse momentum dependence of partons -see [30,31,32,33,34] and references therein.…”

Section: Introductionmentioning

confidence: 99%

A_N in Single-Inclusive Particle Production from Proton-Proton Collisions

Pitonyak¹,

Koike²,

Kanazawa³

et al. 2016

Proceedings of QCD Evolution 2015 — PoS(QCDEV2015)

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We analyze the cause of transverse single-spin asymmetries (TSSAs) in pion and direct photon production from proton-proton (pp) collisions. Two main approaches are used to describe these observables: collinear twist-3 (CT3) factorization and the Generalized Parton Model (GPM). We argue that within the CT3 framework, the fragmentation term can describe very well TSSAs in high transverse momentum charged and neutral pion production in pp collisions at the Relativistic Heavy Ion Collider (RHIC). In addition, TSSAs in direct photon production can be a rich source of information; namely, one can cleanly access the Qiu-Sterman function, test the process dependence of the Sivers function, and distinguish between the CT3 and GPM formalisms.

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Three-gluon contribution to the single spin asymmetry for light hadron production inppcollision

Cited by 46 publications

References 42 publications

Operator constraints for twist-3 functions and Lorentz invariance properties of twist-3 observables

Operator constraints for twist-3 functions and Lorentz invariance properties of twist-3 observables

Transverse Single-Spin Asymmetries in Proton-Proton Collisions Within Collinear Factorization

A_N in Single-Inclusive Particle Production from Proton-Proton Collisions

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