Semi-inclusive deep inelastic scattering at small transverse momentum

Bacchetta, Alessandro; Diehl, Markus; Goeke, K.; Metz, Andreas; Mulders, P.J.; Schlegel, Marc

doi:10.1088/1126-6708/2007/02/093

Cited by 740 publications

(1,348 citation statements)

References 72 publications

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“…These modulations are a function of the azimuthal angles of the final state hadron momentum about the virtual photon direction, as well as that of the target polarization (see e.g., ref. [8] for a review). TMD PDFs enter the SIDIS cross section in momentum space convoluted with transverse momentum dependent fragmentation functions (TMD FFs).…”

Section: Jhep10(2011)021mentioning

confidence: 99%

Bessel-weighted asymmetries in semi-inclusive deep inelastic scattering

Boer

Gamberg

Musch

et al. 2011

J. High Energ. Phys.

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The concept of weighted asymmetries is revisited for semi-inclusive deep inelastic scattering. We consider the cross section in Fourier space, conjugate to the outgoing hadron's transverse momentum, where convolutions of transverse momentum dependent parton distribution functions and fragmentation functions become simple products. Individual asymmetric terms in the cross section can be projected out by means of a generalized set of weights involving Bessel functions. Advantages of employing these Bessel weights are that they suppress (divergent) contributions from high transverse momentum and that soft factors cancel in (Bessel-)weighted asymmetries. Also, the resulting compact expressions immediately connect to previous work on evolution equations for transverse momentum dependent parton distribution and fragmentation functions and to quantities accessible in lattice QCD. Bessel-weighted asymmetries are thus model independent observables that augment the description and our understanding of correlations of spin and momentum in nucleon structure.

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Section: Jhep10(2011)021mentioning

confidence: 99%

Bessel-weighted asymmetries in semi-inclusive deep inelastic scattering

Boer

Gamberg

Musch

et al. 2011

J. High Energ. Phys.

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“…Expressions of azimuthal asymmetries in terms of TMDs for such processes can be found in refs. [19,20] (SIDIS), refs. [21][22][23] (DY), and refs.…”

Section: Introduction and Formalismmentioning

confidence: 99%

Towards a first estimate of the gluon Sivers function from A N data in pp collisions at RHIC

D’Alesio

Murgia

Pisano

2015

J. High Energ. Phys.

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Within a generalized parton model approach, with inclusion of spin and intrinsic transverse momentum effects, we show how the latest, highly precise, midrapidity data on the transverse single spin asymmetry measured in pp → π 0 X by the PHENIX Collaboration at RHIC [1], can be used to get a first estimate on the still poorly known gluon Sivers distribution. To this end we also adopt the present information on the quark Sivers functions, as extracted from semi-inclusive deeply inelastic scattering data. This analysis updates a previous study by some of us where a first bound on this distribution was obtained [2].

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“…For the description of a spin-1/2 target, eight independent TMDs can be introduced (at leading twist) [22][23][24][25]. At present, there exist explicit formulas for the evolution of two of them: the unpolarized TMD, f 1 (x, k T ), and the Sivers function, f ⊥ 1T (x, k T ).…”

Section: Introductionmentioning

confidence: 99%