Transverse spin effects in hard semi-inclusive collisions

Anselmino, M.; Mukherjee, Asmita; Vossen, A.

doi:10.1016/j.ppnp.2020.103806

Cited by 50 publications

(34 citation statements)

References 278 publications

(584 reference statements)

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“…See refs. [11,12] for reviews of (TMD) FFs. TMD FFs are the final-state counter parts of TMD parton distribution functions (PDFs), which describe the intrinsic transverse momentum of partons inside nucleons.…”

Section: Introductionmentioning

confidence: 99%

Joint thrust and TMD resummation in electron-positron and electron-proton collisions

Makris

Ringer

Waalewijn

2021

J. High Energ. Phys.

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We present the framework for obtaining precise predictions for the transverse momentum of hadrons with respect to the thrust axis in e+e− collisions. This will enable a precise extraction of transverse momentum dependent (TMD) fragmentation functions from a recent measurement by the Belle Collaboration. Our analysis takes into account, for the first time, the nontrivial interplay between the hadron transverse momentum and the cut on the thrust event shape. To this end, we identify three different kinematic regions, derive the corresponding factorization theorems within Soft Collinear Effective Theory, and present all ingredients needed for the joint resummation of the transverse momentum and thrust spectrum at NNLL accuracy. One kinematic region can give rise to non-global logarithms (NGLs), and we describe how to include the leading NGLs. We also discuss alternative measurements in e+e− collisions that can be used to access the TMD fragmentation function. Finally, by using crossing symmetry, we obtain a new way to constrain TMD parton distributions, by measuring the displacement of the thrust axis in ep collisions.

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Section: Introductionmentioning

confidence: 99%

Joint thrust and TMD resummation in electron-positron and electron-proton collisions

Makris

Ringer

Waalewijn

2021

J. High Energ. Phys.

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“…In SIDIS processes where the leading hadron is a spinless hadron such as a pion or kaon, two TMD-FFs describe a quark fragmenting into a hadron at the leading twistthe unpolarized fragmentation function, and the Collins function (Collins, 1993) characterizing the correlation between the transverse spin of the fragmenting quark with the transverse momentum of the leading hadron. For more details about this subject, we refer to a recent review by Anselmino, Mukherjee, and Vossen (Anselmino et al, 2020).…”

Section: B Three-dimensional Parton Distributionsmentioning

confidence: 99%

The proton charge radius

Gao,

Vanderhaeghen

2021

Preprint

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Nucleons (protons and neutrons) are the building blocks of atomic nuclei, and are responsible for more than 99% of the visible matter in the universe. Despite decades of efforts in studying its internal structure, there are still a number of puzzles surrounding the proton such as its spin, and charge radius. Accurate knowledge about the proton charge radius is not only essential for understanding how quantum chromodynamics (QCD) works in the non-perturbative region, but also important for bound state quantum electrodynamics (QED) calculations of atomic energy levels. It also has an impact on the Rydberg constant, one of the most precisely measured fundamental constants in nature. This article reviews the latest situation concerning the proton charge radius in light of the new experimental results from both atomic hydrogen spectroscopy and electron scattering measurements, with particular focus on the latter. We also present the related theoretical developments and backgrounds concerning the determination of the proton charge radius using different experimental techniques. We discuss upcoming experiments, and briefly mention the deuteron charge radius puzzle at the end. CONTENTS I. Introduction 1 II. The Proton Charge Radius Puzzle 3 A. Before the millennium 3 B. After the millennium 3 III. Elastic Electron-Proton Scattering 3 A. Introduction to Electron-Proton Scattering and Proton Electromagnetic Form Factors 3 B. Three-dimensional parton distributions 5 C. The nucleon transverse charge densities 7 D. GPDs and quark densities in longitudinal momentum and transverse position in a proton 10 E. Radii of quark distributions in a proton 12 F. Unpolarized electron-proton elastic scattering 16 G. Double-Polarization Elastic Electron-Proton Scattering 17 1. Spin-Dependent Asymmetry from p( e, e )p 17 2. Recoil Proton Polarization from p( e, e p) 18 H. Two-Photon-Exchange Contribution to Electron-Proton Scattering 18 I. Radiative Corrections in Electron Scattering 20 J. The Extraction of the Proton Charge Radius from Proton Electric Form Factor 21 IV. Atomic Hydrogen Spectroscopy 21 V. Modern lepton scattering experiments 24 A. Mainz 2010 24 B. JLab recoil polarization experiment 24 C. Mainz ISR measurements 24 D. The PRad experiment at JLab 25 E. Proton charge radius from modern analyses of proton electric form factor data 29 VI. Modern spectroscopic measurements 31 A. Muonic hydrogen spectroscopic experiments 31 B. Ordinary Hydrogen spectroscopic experiments 33 VII. Ongoing and upcoming experiments 35 A. The MUSE experiment at PSI 35 B. The COMPASS++/AMBER Experiment at CERN 35 C. The PRad-II experiment at Jefferson Lab 36 D. Future electron scattering experiments at Mainz 38 E. The ULQ 2 experiment at Tohoku University 39 VIII. The deuteron charge radius 39 IX. Conclusions 42 X. Acknowledgments 42 References 43

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“…TMD physics is now facing a new, more sophisticated stage, progressing more and more from the initial semiqualitative level to a very detailed quantitative one, comparable in accuracy to the collinear pQCD analysis of PDFs and FFs, at least for some processes. It is not possible in this short overview to fully account for this activity, for which we address the reader to dedicated reviews [3][4][5][6][7]. In the sequel, we briefly outline some of the more interesting facets of the TMD approach currently under active investigation.…”

Section: The Transverse Momentum Dependent Approachmentioning

confidence: 99%

Investigating the Transverse Momentum Dependent Gluon Sivers Function in Quarkonium Production at pp Colliders

2021

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In this contribution, we will present a short overview of the transverse momentum dependent (TMD) approach as a tool for studying the 3-dimensional structure of hadrons in high-energy (un)polarized hadron collisions. We will then summarize the present status of a running research programme that aims at constraining the poorly known transverse momentum dependent gluon Sivers function, through the study of single spin asymmetries in quarkonium (mainly J/ψ), pion, and D-meson production in polarized proton-proton collisions at RHIC. Finally, we will shortly discuss perspectives for this field of research, emphasizing in particular its role in the physics programme of LHC in the fixed-target setup and NICA-SPD at JINR.

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Transverse spin effects in hard semi-inclusive collisions

Cited by 50 publications

References 278 publications

Joint thrust and TMD resummation in electron-positron and electron-proton collisions

Joint thrust and TMD resummation in electron-positron and electron-proton collisions

The proton charge radius

Investigating the Transverse Momentum Dependent Gluon Sivers Function in Quarkonium Production at pp Colliders

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