Systematic approach to inclusive lepton pair production in hadronic collisions

Lam, C. S.; Tung, Wu‐Ki

doi:10.1103/physrevd.18.2447

Cited by 217 publications

(306 citation statements)

References 22 publications

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“…A general relation by Lam and Tung [98,99,100], analogous to the Callan-Gross relation in DIS, is expected to hold in any reference frame: λ = 1 − 2ν. This relation is not modified by first-order QCD corrections [100], but can be influenced by parton intrinsic motions and other nonperturbative effects.…”

Section: Drell-yan Processesmentioning

confidence: 99%

Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

181

100

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In this article we review the present understanding of azimuthal and single spin asymmetries for inclusive and semi-inclusive particle production in unpolarized and polarized hadronic collisions at high energy and moderately large transverse momentum. After summarizing the experimental information available, we discuss and compare the main theoretical approaches formulated in the framework of perturbative QCD. We then present in some detail a generalization of the parton model with inclusion of spin and intrinsic transverse momentum effects. In this context, we extensively discuss the phenomenology of azimuthal and single spin asymmetries for several processes in different kinematical configurations. A comparison with the predictions of other approaches, when available, is also given. We finally emphasize some relevant open points and challenges for future theoretical and experimental investigation.

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Section: Drell-yan Processesmentioning

confidence: 99%

Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

181

100

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“…In this paper we perform calculations in a frame with the Z axis anti-parallel to the target's momentum and the Y axis orthogonal to the reaction plane (in [5] this frame is called the t-channel helicity frame). In order to avoid the helicity frame dependence one introduces invariant structure functions, T i .…”

Section: Jhep05(2015)087mentioning

confidence: 99%

“…. , 4, describing proton interactions with a virtual photon which mediates the lepton pair production [5,6]. All structure functions T i may be decomposed into twist-series using the Operator Product Expansion (OPE), in which the leading twist-two contributions may be computed using standard parton densities and the (unknown) higher twist terms are suppressed by negative powers of the process hard scale.…”

Section: Jhep05(2015)087mentioning

confidence: 99%

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Twist expansion of Drell-Yan structure functions in color dipole approach

Motyka

Sadzikowski

Stebel

2015

J. High Energ. Phys.

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The forward Drell-Yan process at the LHC probes the proton structure at a very small Bjorken-x and moderate hard scales. In this kinematical domain higher twist effects may be significant and introduce sizeable corrections to the standard leading twist description. We study the forward Drell-Yan process beyond the leading twist approximation within the color dipole model framework that incorporates multiple scattering effects. We derive the Mellin representation of the forward Drell-Yan impact factors for fully differential cross-sections. These results combined with the color dipole cross-section of the saturation model are used to perform the twist expansion of the Drell-Yan structure functions at arbitrary transverse momentum q T of the Drell-Yan pair and also of the structure functions integrated over q T . We also investigate the Lam-Tung relation, find that it is broken at twist 4 and provide explicit estimates for the breaking term.

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“…These coefficient functions may be conveniently expressed in terms of hadronic helicity structure functions [39],…”

Section: The Angular Distribution Of the Lepton Pairsmentioning

confidence: 99%

Instantons in lepton pair production

2006

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We consider QCD instanton-induced contributions to lepton pair production in hadron-hadron collisions. We relate these contributions to those known from deep inelastic scattering and demonstrate that they can be calculated reliably for sufficiently large momentum transfer. We observe that the instanton contribution to the angular distribution of the lepton pairs at finite momentum transfer strongly violates the Lam-Tung relation-a relation between coefficient functions of the angular distribution which is valid within the framework of ordinary perturbation theory. The drastic violation of this relation, as seen in experimental data, might be related to such instanton-induced effects.

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Systematic approach to inclusive lepton pair production in hadronic collisions

Cited by 217 publications

References 22 publications

Azimuthal and single spin asymmetries in hard scattering processes

Azimuthal and single spin asymmetries in hard scattering processes

Twist expansion of Drell-Yan structure functions in color dipole approach

Instantons in lepton pair production

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