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We discuss the single transverse-spin asymmetry (SSA) to be observed in the $D$-meson production with large transverse-momentum in semi-inclusive DIS (SIDIS), $e p^\uparrow \rightarrow e D X$. This contribution is embodied as a twist-3…

High Energy Physics - Phenomenology · Physics 2011-07-19 Hiroo Beppu , Yuji Koike , Kazuhiro Tanaka , Shinsuke Yoshida

There have been numerous attempts, in the last decades, to understand the origin of the unexpectedly large transverse single-spin asymmetry ($A_{N}$) observed in inclusive hadron productions at forward rapidities in transversely polarized…

Nuclear Experiment · Physics 2023-07-13 Xilin Liang

We study the single spin asymmetry (SSA) induced by purely gluonic correlation inside a nucleon, in particular, by the three-gluon correlation functions in the transversely polarized nucleon, $p^\uparrow$. This contribution is embodied as a…

High Energy Physics - Phenomenology · Physics 2015-05-20 Hiroo Beppu , Yuji Koike , Kazuhiro Tanaka , Shinsuke Yoshida

We study an exotic type of single spin asymmetry in unpolarized electron-proton scattering, in which the outgoing electron momentum exhibits a left-right asymmetry relative to the transverse spin of the leading baryon $B$ in the target…

High Energy Physics - Phenomenology · Physics 2026-02-10 Yoshitaka Hatta , Oleg V. Teryaev

We revisit the analysis of transverse single-spin asymmetries $A_N$ in lepton-nucleon scattering where only a single pion is detected in the final state, $\ell\,N^\uparrow\to h\, X$. This observable is the Electron-Ion Collider (EIC)…

High Energy Physics - Phenomenology · Physics 2024-04-02 Sophia Fitzgibbons , Michel Malda , Jacob Marsh , Daniel Pitonyak , Penn Smith

We investigate the single-spin asymmetry for the single-inclusive production of hadrons and jets in collisions of transversely polarized nucleons and unpolarized leptons, $\ell N^\uparrow \to (h\,\mathrm{or\,jet})X$. We compute the…

High Energy Physics - Phenomenology · Physics 2025-12-19 Daniel Rein , Marc Schlegel , Patrick Tollkühn , Werner Vogelsang

We calculate the transverse single-spin asymmetry (SSA) for $J/\psi$ production in proton-proton collisions, within non-relativistic QCD, employing the transverse momentum dependent, generalized parton model, which includes both spin and…

High Energy Physics - Phenomenology · Physics 2019-10-23 Umberto D'Alesio , Francesco Murgia , Cristian Pisano , Sangem Rajesh

We show that in the Mclerran-Venugopalan model, an axial asymmetrical valence quark distributions in the transverse plane of a transversely polarized proton can give rise to a spin dependent odderon. Such polarized odderon is responsible…

High Energy Physics - Phenomenology · Physics 2014-05-07 Jian Zhou

Within the framework of a simple model, we study single-spin asymmetries for pion production in hadron-hadron collisions at high-energies with one hadron polarised. The asymmetries are generated via a mechanism of final (initial) state…

High Energy Physics - Phenomenology · Physics 2011-09-13 Azad Ahmedov , Igor V. Akushevich , Eduard A. Kuraev , Philip G. Ratcliffe

Single transverse spin asymmetry for the pion production in pp and ep collisions is studied in the framework of collinear factorization. The soft-gluon pole contributions with twist-3 distribution and fragmentation functions are identified…

High Energy Physics - Phenomenology · Physics 2009-11-07 Yuji Koike

We analyze the single transverse-spin asymmetry (SSAs) for inclusive hadron production in the $pp$ collision at RHIC based on the twist-3 mechanism in QCD. As an origin of SSAs, we take into account of all kinds of pole contributions…

High Energy Physics - Phenomenology · Physics 2014-11-21 Koichi Kanazawa , Yuji Koike

We study the twist-three fragmentation function contribution to the single transverse spin asymmetries in inclusive hadron production in pp collisions, pp->h+X. In particular, we evaluate the so-called derivative contribution which…

High Energy Physics - Phenomenology · Physics 2014-11-20 Zhongbo Kang , Feng Yuan , Jian Zhou

We present a phenomenological approach to the description of single transverse spin asymmetries (STSA) in inclusive hadron production. It generalizes the pQCD formalism for high energies and large p_T inclusive hadron production processes,…

High Energy Physics - Phenomenology · Physics 2007-05-23 M. Anselmino , M. Boglione , F. Murgia

Establishing the twist-3 formalsim for the single transverse spin asymmetry, we present a complete single-spin-dependent cross section for SIDIS, $ep^\uparrow\to e\pi X$, associated with the twist-3 distribution for the transversely…

High Energy Physics - Phenomenology · Physics 2008-11-26 Hisato Eguchi , Yuji Koike , Kazuhiro Tanaka

We study the single transverse-spin asymmetry for inclusive light-hadron productions in the proton-proton collision, $\pphx$ ($h=\pi,K,\eta$), for the RHIC kinematics based on the twist-3 mechanism in the collinear factorization. The…

High Energy Physics - Phenomenology · Physics 2011-06-24 Koichi Kanazawa , Yuji Koike

We show that measurements of single-spin asymmetries (SSAs) in charged current weak interaction processes such as deep inelastic neutrino scattering on a polarized target and inclusive $W$ production in polarized hadron-hadron collisions…

High Energy Physics - Phenomenology · Physics 2009-09-11 Stanley J. Brodsky , Dae Sung Hwang , Ivan Schmidt

The single-spin asymmetry and hadron polarization data are analyzed in the framework of a phenomenological effective-color-field model. Global analysis of the single-spin effects in hadron production is performed for h+h, h+A, A+A and…

High Energy Physics - Phenomenology · Physics 2009-10-08 V. V. Abramov

Our understanding of the transverse spin structure of hadrons might definitely get improved by the information we gather on transverse momentum dependent (TMD) distributions. These new functions could also be crucial for a description of…

High Energy Physics - Phenomenology · Physics 2008-11-26 U. D'Alesio , F. Murgia

Absorptive corrections, known to suppress proton-neutron transitions with large fractional momentum $z\to1$ in pp collisions, become dramatically strong on a nuclear target, and push the partial cross sections of leading neutron production…

High Energy Physics - Phenomenology · Physics 2017-02-27 B. Z. Kopeliovich , I. K. Potashnikova , Ivan Schmidt

We study weighted azimuthal single spin asymmetries in hadron-hadron scattering using the diagrammatic approach at leading order and assuming factorization. The effects of the intrinsic transverse momenta of the partons are taken into…

High Energy Physics - Phenomenology · Physics 2009-11-11 A. Bacchetta , C. J. Bomhof , P. J. Mulders , F. Pijlman