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Avakian, H.

doi:10.1007/978-3-319-50699-9_54

Cited by 6 publications

(27 citation statements)

References 53 publications

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“…SIDIS at JLab and EIC momentum at EIC will extend (see Fig. 2) measurements at JLab12 [67] to significantly higher P hT and lower x and will provide access to studies of TMDs beyond the valence region. A much higher Q 2 range accessible at EIC would allow for studies of the Q 2 -dependence of different higher twist spin-azimuthal asymmetries (Fig 2), which, apart from providing important information on quark-gluon correlations are needed for understanding of possible corrections from higher twists to leading twist observables.…”

Section: Pos(spin2018)171mentioning

confidence: 93%

“…Projections for the resulting P hT -dependence of the double spin asymmetries for all three pions are shown in Fig. 1 for a NH 3 target [11,13]. Integrated over transverse momentum, the data will also be used to extract the k T -integrated standard PDFs.…”

Section: Pos(spin2018)171mentioning

confidence: 99%

“…A p Siv Figure 1: Kinematical coverage of JLab12 and two options of EIC (left) and projections for CLAS12 measurements of double-spin asymmetry A 1 for pion production as a function of P hT compared to published data from CLAS [50], and Q 2 -dependence of the Sivers asymmetry for ep → e π + X, compared to HERMES, COMPASS and future EIC measurements using the EIC [51] configuration with 4 GeV electrons and 60 GeV protons (100 days at 10 34 cm −2 sec −1 ) [13].…”

Section: Q 2 (Gev 2 )mentioning

confidence: 99%

“…A much higher Q 2 range accessible at EIC would allow for studies of the Q 2 -dependence of different higher twist spin-azimuthal asymmetries (Fig 2), which, apart from providing important information on quark-gluon correlations are needed for understanding of possible corrections from higher twists to leading twist observables. LU for positive pion production, using 4 GeV electrons and 60 GeV protons (100 days at 10 34 cm −2 sec −1 ), as a function of P hT (left) and Q 2 (right) compared to published data from CLAS [58] and HERMES [59] and projected CLAS12 [67] in one x, z bin (0.2 < x < 0.3, 0.5 < z < 0.55).…”

Section: Pos(spin2018)171mentioning

confidence: 99%

“…At JLab all 3 halls are involved in 3D structure studies [3] including the HMS and Super HMS at Hall C [4,5,6], the BigBite and Super BigBite, as well as, the SoLID detector at Hall A [7,8,9], and CLAS12 at Hall B [10,11]. Several experiments are already approved to study in details the azimuthal modulations in SIDIS for different hadron types, targets, and polarizations in a broad kinematic range [10,11,12,13,8,5,7,9]. The experimental investigation of medium modification of quark fragmentation and spin-orbit correlation will be also extensively pursued at the upgraded Jefferson Lab facility, for which several related experimental proposals already exist [14,15].…”

Section: Introductionmentioning

confidence: 99%

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3D structure from JLab12 to EIC

Avakian¹

2019

Proceedings of 23rd International Spin Physics Symposium — PoS(SPIN2018)

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Understanding the dynamics of partons in general, and non perturbative sea, in particular, will be crucial for the understanding of strong interactions. Correlations of the spin of the target or/and the momentum and the spin of quarks, combined with final state interactions define the azimuthal distributions of produced particles. Production of correlated hadron pairs, in addition, will play an increasingly important role in the interpretation of pion electroproduction data. Studies of the nucleon structure beyond the traditional leading twist and current fragmentation, provide qualitatively new tools to study the nucleon structure and extension of large x region well covered by JLab, to large Q 2 at EIC will be very important in interpretation of the data from JLab. The large acceptance of the EIC combined with clear separation of target and current fragmentation regions will also provide a unique possibility to study the nucleon structure in the target fragmentation region and correlations of target and current fragmentation regions.

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Section: Pos(spin2018)171mentioning

confidence: 93%

Section: Pos(spin2018)171mentioning

confidence: 99%

Section: Q 2 (Gev 2 )mentioning

confidence: 99%

Section: Pos(spin2018)171mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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3D structure from JLab12 to EIC

Avakian¹

2019

Proceedings of 23rd International Spin Physics Symposium — PoS(SPIN2018)

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The twist-three distribution e(x,k⊥) in a light-front model

Pasquini

Rodini

2019

Physics Letters B

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We discuss the twist-three, unpolarized, chiral-odd, transverse momentum dependent parton distribution (TMD) e q (x, k ⊥ ) within a light-front model. We review a model-independent decomposition of this TMD, which follows from the QCD equations of motion and is given in terms of a leading-twist mass term, a pure interaction-dependent contribution, and singular terms. The leading-twist and pure twist-three terms are represented in terms of overlap of light-front wave functions (LFWFs), taking into account the Fock states with three valence quark (3q) and three-quark plus one gluon (3q + g). The 3q and 3q + g LFWFs with total orbital angular momentum zero are modeled using a parametrization derived from the conformal expansion of the proton distribution amplitudes, with parameters fitted to reproduce available phenomenological information on the unpolarized leading-twist quark and gluon collinear parton distributions. Numerical predictions for both the quark TMD e q (x, k ⊥ ) and the collinear parton distribution e q (x) are presented, discussing the role of the quark-gluon correlations in the proton. * Electronic address: barbara.pasquini@pv.infn.it † Electronic address: simone.rodini01@ateneopv.it (LFWFs), that provide a convenient framework for modelling parton distribution functions [38][39][40]. We focus on the twist-three, unpolarized, chiral-odd quark TMD e q (x, k ⊥ ) [6], which is constructed as overlap integrals between LFWFs with the minimum (valence) and next-to-minimum (one extra gluon) parton content. The LFWFs are modeled in the same spirit of Ref. [41], where the calculation was restricted to the leading-twist PDFs and to the twist-three polarized structure function g q 2 (x). In particular, we consider only the Fock states with zero partons' orbital angular momentum, which are expected to be the dominant contribution for unpolarized distribution functions. These LFWF components for the 3q and 3q + g Fock states are related, in the light-front limit (zero transverse separation), to the nucleon twist-three and twist-four distribution amplitudes (DAs), respectively. We then use the lattice and QCD sum rule results for the proton DAs as guideline to parametrize the dependence of the LFWFs on the longitudinal momenta of the partons. For the dependence on the partons' transverse momentum k ⊥ we adopt a Gaussian form, modified according to the Brodsky-Huang-Lepage prescription [42] to take into account a non-vanishing mass of the partons. The mass of the partons along with the other parameters modelling the proton DAs are then fitted to reproduce the results for the quark and gluon unpolarized twist-two PDFs from available phenomenological parametrizations. Having specified the LFWFs, we calculate the e q (x, k ⊥ ) TMD and e q (x) PDF, discussing the role of the twist-two and the genuine twist-three contributions, and compare our predictions with available phenomenological information.The work is organized as follows: in Sec. II we introduce the definitions of the unpolarized twist-two TMDs of quark and g...

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Experimental results on TMDs

Avakian

Contalbrigo

2016

Eur. Phys. J. A

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QCD factorisation for semi-inclusive deep inelastic scattering at low transverse momentum in the current-fragmentation region has been established recently, providing a rigorous basis to study the Transverse Momentum Dependent distribution and fragmentation functions (TMDs) of partons from Semi-Inclusive DIS data using different spin-dependent and spin-independent observables. The main focus of the experiments were the measurements of various single-and double-spin asymmetries in hadron electro-production (ep ↑ → ehX) with unpolarised, longitudinally and transversely polarised targets. The joint use of a longitudinally polarised beam and longitudinally and transversely polarised targets allowed to measure double-spin asymmetries (DSA) related to leading-twist distribution functions describing the transverse momentum distribution of longitudinally and transversely polarised quarks in a longitudinally and transversely polarised nucleons (helicity and worm-gear TMDs). The single-spin asymmetries (SSA) measured with transversely polarised targets, provided access to specific leading-twist parton distribution functions: the transversity, the Sivers function and the so-called "pretzelosity" function. In this review we present the current status and some future measurements of TMDs worldwide.

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Cited by 6 publications

References 53 publications

3D structure from JLab12 to EIC

3D structure from JLab12 to EIC

The twist-three distribution e(x,k⊥) in a light-front model

Experimental results on TMDs

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