1. 3D Parton Distributions: path to the LHC
The goal:
address unresolved issues of the physics of the transverse structure of the nucleon
define what unique insights the LHC data can offer to improve the knowledge of TMDs and, where the knowledge of 3D PDFs can be necessary to achieve high-precision results demanded by the search for new physics

2. Proton structure Fundamentals of theory
Define the origin of the orbital momentum and transverse motion of partons
How to parameterize the non perturbative dynamics (TMD,GPD,GTMDs,FF,..)?
Factorization
Universality
Evolution
Quark-gluon correlations
Lattice studies
......
Modeling and Phenomenology
Input for simulations
Studies of model dependence
Studies of Radiative corrections
May 2016
FNAL
JPARC
BNL
EIC
LNF Nov 29

3. Spin and azimuthal asymmetries in pp and ep
Large transverse single-spin effects were observed, in p+p collisions
Large cosf modulations observed by EMC in p+p h1
EMC ( ) P1

4. Single-Spin Asymmetries in electroproduction
HERMES note
LNF Nov 29

5. SSAs: Black Swans of Nucleon Structure
rarity: it is an outlier, as it lies outside the realm of regular expectations, because nothing in the past can convincingly point to its possibility.
it carries an extreme impact.
retrospective (not prospective) predictability: in spite of its outlier status, human nature makes us concoct explanations for its occurrence after the fact, making it explainable and predictable.
One single observation can invalidate a general statement derived from millennia of confirmatory sightings of millions of white swans. All you need is one single (ugly) black bird.

6. TMD Topical Theory Collaboration
Coordinated Theoretical Approach to Transverse Momentum Dependent Hadron Structure in QCD (TMD Collaboration)
Principal Investigator/Project Director: Jianwei Qiu
BNL
MIT
LBNL
PSU-Berks
U Maryland
U Kentucky
JLAB
U Arizona
U Virginia
ODU
LANL
Duke U
NMSU
One of three DOE supported Topical Theory Collaborations
Has 4 National Labs + 9 Universities ($2,226K from DOE Nuclear Theory)

7. European projects (ERC & INFN grants)
ERC Advanced Grant: QWORK
PI: Piet Mulders (VU/Nikhef)
Topics: TMDs with focus on polarized gluons, diffraction.
REF (Resummation, Evolution, Factorization) Meetings involving physicists at DESY, Oxford, Nikhef/VU/, Paris, Madrid, Pavia
PI: Alessandro Bacchetta
Budget: 1.5 M€
3 staff members, 3 post-docs, and 3 PhD students
Institutions: Pavia University and INFN
NINPHA ( INFN National Initiative):
Coordinator: M. Boglione
(Pavia, Torino, Cagliari, Rome, Genova, Perugia (about 25 people involved, most devoted to TMDs).

8. JLab12 GeV Approved Experiments by Physics Topics

9. LHC PT-distributions
Studies of PT-distributions of hadrons at LHC will contribute to better knowledge of initial transverse momentum distributions of partons, and may in turn improve the description of observed PT-distributions of hadrons at LHC

10. Enthusiasm Initiative
Focus on increasing theoretical and experimental support for the nucleon 3D PDF programs worldwide
Combining experiment, lattice, theory to pin down the 3D structure of nucleon
Identify common interests of 3D PDF & LHC communities
Enthusiasm
Initiative
HAVE A VERY PRODUCTIVE WEEK!
LNF Nov 29

11. Support slides
LNF Nov 29

12. TMD Topical Theory Collaboration
Objectives/Deliverables – 3D Confined Motion:
Unique three pronged scientific effort: (1) theory, (2) phenomenology and (3) lattice QCD, to explore 3D hadron structure – 3D confined motion!
Matching x-section to parton motion
– QCD factorization
Parton motion vs. probing scale
– QCD quantum evolution
– RHIC Run17 – W program
Lattice QCD calculation of TMDs
– QCD 1st principle prediction?
Fast software to extract TMDs
– Service to community
JLab12 data, …
Sivers
function
Density distribution of an unpolarized
quark in a proton moving in z direction
and polarized in y-direction
LNF Nov 29

13. Three stages for new phenomena
Any unexplained phenomenon passes through three stages before the reality of it is accepted.
During the first stage it is considered laughable.
During the second stage, it is adamantly opposed.
Finally, during the third stage, it is accepted as self-evident.
Arthur Schopenhauer
LNF Nov 29