Spin and Orbital Angular Momentum of Quarks and Gluons in the Nucleon

25 août 2014, 09:00 → 29 août 2014, 18:00 Europe/Rome

Understanding the internal structure of the proton is a crucial challenge for QCD, and one important aspect of this is to understand how the spin of the nucleon is built up from the angular momentum of its quarks and gluons. This, it has turned out, is a very subtle and controversial issue.

The aim of this workshop is to bring together the main actors in the field of the proton spin decomposition to summarize the recent progress and discuss the remaining controversial points.

Main Topics

• Introduction to quark and gluon angular momentum
• Spin decompositions and sum rules
• Gauge independence of matrix elements
• Angular momentum, GPDs and TMDs
• Angular momentum in phenomenological models
• Angular momentum on the lattice
• Angular momentum via TMD and GPD measurements in DIS and SIDIS
• Angular momentum via TMD measurements in hadronic collisions

Key speakers include

Alessandro Bacchetta (Pavia University & INFN)
Les Bland (Brookhaven National Laboratory)
Matthias Burkhardt (New Mexico State University)
Xiang-Song Chen (Huazhong University)
Nicole D’Hose (IRFU/SPhN Saclay)
Charles Hyde (Old Dominion University)
Keh-Fei Liu (Kentucky University)
Barbara Pasquini (Pavia University & INFN)
Masashi Wakamatsu (Osaka University)


Organizers

Mauro Anselmino (Torino University & INFN)
Elliot Leader (Imperial College)
Cédric Lorcé (IPN, Orsay and IFPA, Liège)

Poster

lun. 25 août

09:00 → 09:35 Registration

09:35 → 09:40 Welcome

09:40 → 10:40 The current status of nucleon spin decomposition problem

Orateur: Prof. Masashi Wakamatsu (Osaka University)

Slides Wakamatsu.pdf

10:40 → 11:00 Discussion

11:00 → 11:30 Coffee break

11:30 → 12:30 How to test gauge independence of matrix elements

Orateur: Prof. Xiang-Song Chen (Sichuan University)

Slides Chen.pdf

12:30 → 12:50 Discussion

12:50 → 14:30 Lunch break

14:30 → 15:30 ECT* Colloquium: Introduction to quark and gluon angular momentum

Orateur: Dr Cédric Lorcé (Liège University)

Slides Lorce.pptx

15:30 → 16:10 Angular momentum in light-front dynamics

Short talk

Orateur: Prof. Ben Bakker

Slides Bakker.pdf

16:10 → 16:30 Discussion

16:30 → 17:00 Coffee break

17:00 → 18:00 Spin and orbital angular momenta in optics and electromagnetism

Orateur: Prof. Konstantin Bliokh

Slides Bliokh.pdf

18:00 → 18:20 Discussion

19:00 → 21:00 Dinner at ECT*

mar. 26 août

09:00 → 10:00 What is quark orbital angular momentum?

Orateur: Prof. Matthias Burkardt (New Mexico State University)

Slides Burkardt.pdf

10:00 → 10:40 Angular momenta from GPDs

Short talk

Orateur: Prof. Peter Kroll

Slides Kroll.pdf

10:40 → 11:00 Discussion

11:00 → 11:30 Coffee break

11:30 → 12:30 Experimental study of Generalized Parton Distributions at Jefferson Lab

Orateur: Prof. Charles Hyde (Old Dominion University)

Slides Hyde.pdf

12:30 → 12:50 Discussion

12:50 → 14:30 Lunch break

14:30 → 15:10 Observability of quark and gluon orbital angular momentum

Short talk

Orateur: Prof. Simonetta Liuti

Slides Liuti.pptx

15:10 → 15:50 Quark orbital angular momentum with experimental prospects

Short talk

Orateur: Dr Aurore Courtoy

Slides Courtoy.pdf

15:50 → 16:10 Discussion

16:10 → 16:40 Coffee break

16:40 → 17:20 Quark orbital angular momentum from physical observables

Short talk

Orateur: Prof. Bo-Qiang Ma

Slides Ma.pdf

17:20 → 17:40 Discussion

mer. 27 août

09:00 → 10:00 Angular momentum in phenomenological models

Orateur: Prof. Barbara Pasquini (Universita' di Pavia)

Slides Pasquini.pdf

10:00 → 10:40 Wigner distributions and orbital angular momentum of the quarks

Short talk

Orateur: Prof. Asmita Mukherjee

Slides Mukherjee.pdf

10:40 → 11:00 Discussion

11:00 → 11:30 Coffe break

11:30 → 12:30 Angular momentum and TMDs

Orateur: Prof. Alessandro Bacchetta (University of Pavia)

Slides Bacchetta.pdf

12:30 → 12:50 Discussion

12:50 → 14:30 Lunch break

jeu. 28 août

09:00 → 10:00 Proton spin components from lattice calculation

Orateur: Prof. Keh-Fei Liu (University of Kentucky)

Slides Liu.pdf

10:00 → 10:40 EIC project in China

Short talk

Orateur: Prof. Fan Wang

Slides Wang.ppt

10:40 → 11:00 Discussion

11:00 → 11:30 Coffee break

11:30 → 12:30 Overview of spin angular momentum via TMD measurements in DIS and SIDIS

Orateur: Prof. Gunar Schnell

Slides Schnell.pdf

12:30 → 12:50 Discussion

12:50 → 14:30 Lunch break

14:30 → 15:30 Overview of orbital angular momentum via TMD measurements in hadronic collisionss

Orateur: Prof. Les Bland (Brookhaven National Laboratory)

Slides Bland.ppt

15:30 → 16:10 Spin-orbit interactions, TMDs and Bessel weighted asymmetries

Short talk

Orateur: Prof. Leonard Gamberg

Slides Gamberg.pdf

16:10 → 16:30 Discussion

16:30 → 17:00 Coffee break

17:00 → 17:40 Single-spin asymmetries in deep-inelastic processes

Short talk

Orateur: Dr Marc Schlegel

Slides Schlegel.pdf

17:40 → 18:20 SSA at small x and the anomalous magnetic moment

Short talk

Orateur: Dr Jian Zhou

Slides Zhou.ppt

18:20 → 18:40 Discussion

20:00 → 23:00 Social dinner

ven. 29 août

09:00 → 09:40 Probing Angular Momenta : GTMDs and Observables

Short talk

Orateur: Prof. Gary Goldstein

Slides Goldstein.pdf

09:40 → 10:20 Transverse spin sum rules

Short talk

Orateur: Prof. Daniël Boer

Slides Boer.pdf

10:20 → 11:00 Orbital Chromodynamics and the Pion Tornado

Short talk

Orateur: Prof. Dennis Sivers

Slides Sivers.pptx

11:00 → 11:20 Discussion

11:20 → 11:50 Coffee break

11:50 → 12:25 Summary of the workshop

Orateur: Prof. Elliot Leader

Slides Leader.pdf

12:25 → 12:45 General discussion

12:45 → 12:50 Conclusion and farewell

Short talk

12:50 → 14:30 Farewell lunch