The theory and phenomenology of polarized deep inelastic scattering

Anselmino, M.; Ефремов, А. В.; Leader, Elliot

doi:10.1016/0370-1573(95)00011-5

Cited by 399 publications

(388 citation statements)

References 101 publications

Supporting

Mentioning

375

Contrasting

Unclassified

Order By: Relevance

“…In this case two twist-three effects could contribute: the twist-three chiral-odd distribution φ (3) a/p (x 1 , x 2 ), coupled with a twist-two unpolarized PDF and a twist-two chiral-odd fragmentation function (analogous to the twist-two transversity PDF); a twist-three chiral-even FF, that, following the same notation adopted in Eq. (24), would read D (3) c→Λ ↑ (z 1 , z 2 ), coupled with two twist-two unpolarized PDF's. The first contribution has been studied in Ref.…”

Section: Twist-three Effects In Collinear Pqcdmentioning

confidence: 99%

“…The first contribution has been studied in Ref. [197], where by adopting a simple ansatz on φ (3) a/p (x 1 , x 2 ), namely a proportionality relation with the chiral-odd transversity distribution, the main features of the data are reproduced, although some discrepancies still remain.…”

Section: Twist-three Effects In Collinear Pqcdmentioning

confidence: 99%

“…The rich, low-energy aspects of topics iii) and iv), which may be confronted only with nonperturbative approaches, will also remain uncovered. A comprehensive overview on these subjects and on related topics can be found in several review papers, addressing both their theoretical and experimental aspects [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. Here we will focus on the high-energy regime and the treatment in the context of pQCD approaches of transverse SSA's and, marginally, of the transverse polarization of spin 1/2 particles in unpolarized processes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

181

100

View full text Add to dashboard Cite

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.

show abstract

Section: Twist-three Effects In Collinear Pqcdmentioning

confidence: 99%

Section: Twist-three Effects In Collinear Pqcdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

181

100

View full text Add to dashboard Cite

show abstract

“…These days much attention is attracted to the nucleon's spin-dependent Structure Functions (SF), g N 1,2 (see e.g. review [1] and references therein). The SFs, g 1,2 , is the simplest example of the spin-dependent SFs, which exist for all targets with a nonzero spin, starting s = 1/2.…”

Section: Introductionmentioning

confidence: 99%

Relativistic calculation of structure functions b1,2(x) of the deuteron

Umnikov

1997

Physics Letters B

View full text Add to dashboard Cite

show abstract

“…The authors in Refs. [8,9] have shown that it is necessary to include the "twist-3" gluon term (i.e. the transverse momentum) and use the equation of motion to achieve a gauge invariant final result.…”

mentioning

confidence: 99%

Twist-3 and quark mass contributions to the polarized nucleon structure function g2(x,Q2)

Yang¹,

Yu²

1998

Physics Letters B

View full text Add to dashboard Cite

Quark mass effects are clarified in the parton model approach to the transversely polarized nucleon structure function. The special propagator technique is employed to obtain manifestly gauge invariant results and extract the buried short-distance contributions inside the soft part after momentum factorization in the collinear expansion approach. A generalized massive special propagator for a massive quark is constructed. We identify the corresponding matrix elements of the transversely polarized structure function in deep inelastic scatterings by the massive special propagator technique.Typeset using REVT E X * Email address: kcyang@phys.sinica.edu.tw † Email address: PHHLYU@ccvax.sinica.edu.tw 1The naive parton model that built upon massless free partons had proved itself tremendously successful towards the understanding of spin averaged high energy processes. However, a lot of interesting physics and even possible spin dependent new physics are washed out during the averaging procedure. Following the advances of experimental techniques and facilities, both polarized probe and target become more popular. The EMC data [1] on longitudinally polarized deeply inelastic scattering (DIS) experiments had already provided us lots of surprises and insights into the nuclear structure in the past decade. Spin physics has therefore become one of the most fascinating subjects towards the understanding of the quark and gluon dynamics inside hadrons. High precision data along with state-of-the-art higher order perturbative QCD (pQCD) computation enable us to test the standard model to high accuracy. However, in DIS, where most spin data exist, much work on the subject has concentrated on the leading twist contributions which measure the helicity of the quark constituents. Recently, results in the DIS transversely polarized structure function g T (x, Q 2 ) were reported and have shown a non-negligible contribution [2]. g T contains a chiral even part which measures the quark transverse spin asymmetry and a chiral odd part which is described by the quark transversity distribution [3,4] in the nucleon. Extensive study is expected to be performed at DESY, CERN and SLAC.Quark transverse spin is famous for its conceptual difficulties and confusions in the literature [3,[5][6][7]. As emphasized in Ref. [6], quark transverse spin is a fundamental degree of freedom, and the transversity parton distribution which measures the quark helicity-flip in the helicity basis is well-defined even for massless partons. To see its partonic probabilistic interpretation one has to go to transverse spin eigenstate where transversity becomes diagonal. It simply measures the difference of oppositely transverse polarized quarks inside the nucleon. Using an anti-quark probe as in the Drell-Yan process, the transversity is a leading twist effect and is a naturally large quantity. It is important to note that helicity and chirality are identical for "good" light cone component of the Dirac field. Since in DIS, the virtual photon is a chirally inv...

show abstract

The theory and phenomenology of polarized deep inelastic scattering

Abstract: Comprehensive review paper on the theory and phenomenology of polarized deep inelastic scattering, to appear in Physics ReportsComment: 113 pages, latex, 40 figures not included (hard copies available via mail upon request to anselmino@to.infn.it

Cited by 399 publications

References 101 publications

Azimuthal and single spin asymmetries in hard scattering processes

Azimuthal and single spin asymmetries in hard scattering processes

Relativistic calculation of structure functions b1,2(x) of the deuteron

Twist-3 and quark mass contributions to the polarized nucleon structure function g2(x,Q2)

Contact Info

Product

Resources

About