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We explore the complete cross-section for the production of unpolarized hadrons in semi-inclusive deep-inelastic scattering up to power-suppressed $\mathcal{O}(1/Q^2)$ terms in the Wandzura-Wilczek-type (WW-type) approximation, which…

High Energy Physics - Phenomenology · Physics 2019-07-30 S. Bastami , H. Avakian , A. V. Efremov , A. Kotzinian , B. U. Musch , B. Parsamyan , A. Prokudin , M. Schlegel , G. Schnell , P. Schweitzer , K. Tezgin

We study the polar and azimuthal decay angular distributions of $J/\psi$ mesons produced in semi-inclusive, deep-inelastic electron-proton scattering. For the description of the quarkonium formation mechanism, we adopt the framework of…

High Energy Physics - Phenomenology · Physics 2022-03-23 Umberto D'Alesio , Luca Maxia , Francesco Murgia , Cristian Pisano , Sangem Rajesh

We investigate the semi-inclusive deep inelastic scattering off a tensor-polarized spin-1 target, focusing on the production of an unpolarized hadron. The complete differential cross section is expressed in terms of 23 structure functions,…

High Energy Physics - Phenomenology · Physics 2025-12-12 Jing Zhao , Alessandro Bacchetta , Shunzo Kumano , Tianbo Liu , Ya-jin Zhou

Semi-inclusive deep inelastic scattering off nuclei is a unique process to study the parton propagation mechanism and its modification induced by the presence of the nuclear medium. It allows us to probe the medium properties, particularly…

High Energy Physics - Phenomenology · Physics 2024-09-20 Raphaël Dupré , Federico Ceccopieri

We present a study on the double longitudinal-spin asymmetry of dihadron production in semi-inclusive deep inelastic scattering, in which the total transverse momentum of the final-state hadron pairs is integrated out. In particular, we…

High Energy Physics - Phenomenology · Physics 2019-11-06 Wei Yang , Hui Li , Zhun Lu

Recently HERMES has observed an azimuthal asymmetry in electro-production of neutral pions in semi-inclusive deep-inelastic scattering of unpolarized positrons off longitudinally polarized protons. This asymmetry (like those observed in the…

High Energy Physics - Phenomenology · Physics 2008-11-26 A. V. Efremov , K. Goeke , P. Schweitzer

The cross section for semi-inclusive deep inelastic scattering can be decomposed in terms of 18 structure functions. At low transverse momentum of the detected hadron, the structure functions can be expressed in terms of…

High Energy Physics - Phenomenology · Physics 2008-11-26 Alessandro Bacchetta

The transverse single-spin asymmetry for $\rho^0$ production in semi-inclusive deep inelastic scattering was recently reported by the COMPASS Collaboration. Using the Sivers functions extracted from pion and kaon productions, we perform a…

High Energy Physics - Phenomenology · Physics 2025-06-27 Yongjie Deng , Tianbo Liu , Ya-jin Zhou

We demonstrate a factorization formula for semi-inclusive deep-inelastic scattering with hadrons in the current fragmentation region detected at low transverse momentum. To facilitate the factorization, we introduce the transverse-momentum…

High Energy Physics - Phenomenology · Physics 2011-08-01 Xiangdong Ji , Jian-ping Ma , Feng Yuan

In the leading order of QCD parton model of Semi Inclusive Deep Inelastic Scattering (SIDIS) the double spin asymmetry $A_{LT}$ arises due to the longitudinal polarization of quarks in the transversely polarized nucleon. The corresponding…

High Energy Physics - Phenomenology · Physics 2008-11-26 A. Kotzinian , B. Parsamyan , A. Prokudin

We compare the relative importance of different mechanisms for polarized $J/\psi$ production in semi-inclusive deep inelastic scattering processes at large $Q^2$. The transverse momentum dependent (TMD) factorization framework and…

High Energy Physics - Phenomenology · Physics 2024-04-30 Marston Copeland , Sean Fleming , Rohit Gupta , Reed Hodges , Thomas Mehen

It is shown that the azimuthal dependence of the distribution of hadrons in a quark jet is a probe of the transverse spin of the quark initiating the jet. This results in a new spin-dependent fragmentation function that acts at the twist-2…

High Energy Physics - Phenomenology · Physics 2009-10-22 John Collins

Semi-Inclusive Deep Inelastic Scattering (SIDIS) is a key tool for exploring the three-dimensional structure of the nucleon through Transverse Momentum Dependent parton distributions and fragmentation functions. While leading-power…

High Energy Physics - Phenomenology · Physics 2026-01-28 Ian Balitsky , Alexei Prokudin

We study the single-transverse spin asymmetry in semi-inclusive hadron production in deep inelastic scattering. We derive the leading contribution to the asymmetry at moderate transverse momentum $P_{h\perp}$ of the produced hadron in terms…

High Energy Physics - Phenomenology · Physics 2008-11-26 Xiangdong Ji , Jian-Wei Qiu , Werner Vogelsang , Feng Yuan

We study the $\sin2\phi_h$ azimuthal asymmetry of charged and neutral pion productions off the longitudinally polarized nucleon targets in semi-inclusive deeply inelastic scattering (SIDIS) process within the transverse momentum…

High Energy Physics - Phenomenology · Physics 2022-08-24 Hui Li , Zhun Lu

The distribution of the azimuthal angle for the charged hadrons has been studied in the hadronic centre-of-mass system for neutral current deep inelastic positron-proton scattering with the ZEUS detector at HERA. Measurements of the…

High Energy Physics - Experiment · Physics 2012-08-27 ZEUS Collaboration

A QCD analysis of the world data on polarized deep inelastic scattering is presented in leading and next-to-leading order. New parameterizations are derived for the quark and gluon distributions for the kinematic range $x \epsilon…

High Energy Physics - Phenomenology · Physics 2016-09-06 J. Blümlein , H. Böttcher

The target fragmentation region of semi-inclusive deep inelastic scattering is described at leading twist, taking beam and target polarizations into account. The formalism of polarized and transverse-momentum dependent fracture functions is…

High Energy Physics - Phenomenology · Physics 2011-04-20 Mauro Anselmino , Vincenzo Barone , Aram Kotzinian

Recent data from semi-inclusive deep inelastic scattering collected by the HERMES collaboration allow for the first time to discuss how the transverse-momentum dependence of unpolarized distribution and fragmentation functions is affected…

High Energy Physics - Phenomenology · Physics 2015-06-17 Andrea Signori , Alessandro Bacchetta , Marco Radici

The spin-dependent cross sections for semi-inclusive lepton-nucleon scattering are derived in the framework of collinear factorization, including the effects of masses of the target and produced hadron at finite momentum transfer squared…

High Energy Physics - Phenomenology · Physics 2015-10-28 J. V. Guerrero , J. J. Ethier , A. Accardi , S. W. Casper , W. Melnitchouk
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