Gluon and Wilson loop TMDs for hadrons of spin ≤ 1

Boer, Daniël; Cotogno, Sabrina; Daal, Tom van; Mulders, P.J.; Signori, Andrea; Zhou, Ya-jin

doi:10.1007/jhep10(2016)013

Cited by 97 publications

(152 citation statements)

References 58 publications

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“…If P 2 hT Q 2 , TMD factorization can be applied and the process is sensitive to TMDs [2]. If polarization is taken into account, several TMDs can be introduced [7,[9][10][11][12]. Attempts to extract some of them have already been presented in the past [13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production

Bacchetta

Delcarro

Pisano

et al. 2017

J. High Energ. Phys.

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205

239

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We present an extraction of unpolarized partonic transverse momentum distributions (TMDs) from a simultaneous fit of available data measured in semi-inclusive deep-inelastic scattering, Drell-Yan and Z boson production. To connect data at different scales, we use TMD evolution at next-to-leading logarithmic accuracy. The analysis is restricted to the low-transverse-momentum region, with no matching to fixed-order calculations at high transverse momentum. We introduce specific choices to deal with TMD evolution at low scales, of the order of 1 GeV 2 . This could be considered as a first attempt at a global fit of TMDs.

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Section: Introductionmentioning

confidence: 99%

Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production

Bacchetta

Delcarro

Pisano

et al. 2017

J. High Energ. Phys.

Self Cite

205

239

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“…The notation here for f 1 , f 1LL and g 1 is the same as in Refs. [28,29], while δG(x) is named h 1T T in those works. The Mellin moments of this equation are related to the reduced matrix elements of local operators:…”

Section: Soffer-like Inequalitymentioning

confidence: 99%

Erratum: Gluonic transversity from lattice QCD [Phys. Rev. D 94 , 014507 (2016)]

Detmold¹,

Shanahan²

2017

Phys. Rev. D

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We present an exploratory study of the gluonic structure of the φ meson using lattice QCD (LQCD). This includes the first investigation of gluonic transversity via the leading moment of the twist-two double-helicity-flip gluonic structure function ∆(x, Q 2 ). This structure function only exists for targets of spin J ≥ 1 and does not mix with quark distributions at leading twist, thereby providing a particularly clean probe of gluonic degrees of freedom. We also explore the gluonic analogue of the Soffer bound which relates the helicity flip and non-flip gluonic distributions, finding it to be saturated at the level of 80%. This work sets the stage for more complex LQCD studies of gluonic structure in the nucleon and in light nuclei where ∆(x, Q 2 ) is an 'exotic glue' observable probing gluons in a nucleus not associated with individual nucleons.

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“…In addition, several spin-dependent gluon TMDs inside a spin-1 target that could persist in the small-x limit are identified in ref. [51]. It would be very interesting to test these theoretical expectations at RHIC, LHC or a future EIC.…”

Section: Jhep10(2017)196mentioning

confidence: 95%

Suppression of maximal linear gluon polarization in angular asymmetries

Boer

Mulders

Zhou

et al. 2017

J. High Energ. Phys.

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Abstract:We perform a phenomenological analysis of the cos 2φ azimuthal asymmetry in virtual photon plus jet production induced by the linear polarization of gluons in unpolarized pA collisions. Although the linearly polarized gluon distribution becomes maximal at small x, TMD evolution leads to a Sudakov suppression of the asymmetry with increasing invariant mass of the γ * -jet pair. Employing a small-x model input distribution, the asymmetry is found to be strongly suppressed under TMD evolution, but still remains sufficiently large to be measurable in the typical kinematical region accessible at RHIC or LHC at moderate photon virtuality, whereas it is expected to be negligible in Z/W -jet pair production at LHC. We point out the optimal kinematics for RHIC and LHC studies, in order to expedite the first experimental studies of the linearly polarized gluon distribution through this process. We further argue that this is a particularly clean process to test the k t -resummation formalism in the small-x regime.

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Gluon and Wilson loop TMDs for hadrons of spin ≤ 1

Cited by 97 publications

References 58 publications

Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production

Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production

Erratum: Gluonic transversity from lattice QCD [Phys. Rev. D 94 , 014507 (2016)]

Suppression of maximal linear gluon polarization in angular asymmetries

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