Fragmentation contribution to the transverse single-spin asymmetry in proton–proton collisions

Metz, Andreas; Pitonyak, Daniel

doi:10.1016/j.physletb.2013.05.043

Cited by 93 publications

(68 citation statements)

References 132 publications

(183 reference statements)

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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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“…In practical calculation these FFs may be set to zero in the Wandzura-Wilczek approximation [39]. However, recent studies [40][41][42] on the contributions of the chirally and time-reversal odd FFs to the SSA in proton-proton collisions within the collinear twist-3 factorization, show that the fragmentation contributions from three parton correlation could still be sizeable. In the light of those studies, it is possible that the contributions in SIDIS to the sin φ S and sin(2φ h −φ S ) asymmetries from the chiraland T-odd FFH might also be non-negligible.…”

Section: Introductionmentioning

confidence: 99%

Transverse single-spin asymmetries of pion production in semi-inclusive DIS at subleading twist

Mao

Lü

2014

Phys. Rev. D

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We study the single-spin asymmetries with the sin φS and sin(2φ h − φS) angular dependences for charged and neutral pions produced in semi-inclusive deep inelastic scattering on the transversely polarized proton target. The theoretical interpretations of the two asymmetries are presented in terms of the convolution of the twist-3 quark transverse momentum dependent distributions and twist-2 fragmentation functions. Specifically, we investigate the role of the distributions fT , hT and h ⊥ T in the sin φS asymmetry, as well as the role of the distributions f ⊥ T , hT and h ⊥ T in the sin(2φ h −φS) asymmetry. We calculate these distributions in a spectator-diquark model and predict the corresponding asymmetries for the first time, considering the kinematics at HERMES, JLab and COMPASS. The numerical estimates show that the asymmetries are sizable, and the dominant contribution to the sin φS asymmetry comes from the T-odd distribution fT , while f ⊥ T gives the main contribution to the sin(2φ h − φS) asymmetry. The future measurements on these asymmetries can shed light on the information of twist-3 transverse momentum dependent distributions.

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“…These effects appear in the form of a twist-3 distribution function or a twist-3 fragmentation function in the spin-dependent cross section. So far the complete twist-3 cross section for p ↑ p → πX has been derived [4,5,6,7,8,9] and the RHIC data for this process [10] has been analyzed [11]. However, for pp → Λ ↑ X, complete twist-3 cross section is not yet available.…”

Section: Introductionmentioning

confidence: 99%

Twist-3 approach to hyperon polarization in unpolarized proton-proton collision

Yabe¹,

Koike²,

Yoshida³

2016

Proceedings of XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2016)

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We study the transverse polarization of hyperons produced in high-energy unpolarized protonproton collisions in the framework of the collinear factorization. This phenomenon is a twist-3 observable which receives contributions from a twist-3 distribution and a twist-3 fragmentation function. We focus on the former contribution and derive the corresponding leading-order cross section. For the soft-gluon-pole contribution, we develop the "master formula" which reduces the partonic cross section to a certain 2 → 2 parton scattering cross section and thus simplifies the calculation greatly. We also calculate the soft-fermion-pole contribution for the first time and show that it vanishes in all channels.

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Fragmentation contribution to the transverse single-spin asymmetry in proton–proton collisions

Cited by 93 publications

References 132 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 of pion production in semi-inclusive DIS at subleading twist

Twist-3 approach to hyperon polarization in unpolarized proton-proton collision

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