3rd Proton Mass Workshop: Origin and Perspective - Welcome
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3rd Proton Mass Workshop: Origin and Perspective
Welcome
Ian Cloet
Argonne National Laboratory
Organizers: Ian Cloet, Xiangdong Ji, Zein-Eddine Meziani, and Jianwei Qiu
14−16 January 2021
Why are we here?
Derek Leinweber (Adelaide)
• We are here to discuss one of the most fundamental questions in
strong interaction physics: How does the proton get its mass?
• Intimately connected to the origin of the visible
universe
• The proton contains an uncountable number
of quarks, anti-quarks, and gluons
• However, even if the quarks are massless (chiral
limit) the proton only gets around 5% lighter
(sigma terms)
• The proton gets the vast bulk of its mass from the field energies of the
quarks and gluons it contains
• Deeply connected with emergent phenomena of color confinement and
dynamical chiral symmetry breaking – entwined with the trace anomaly⟨N��T `
`
��N⟩= 2m2
N ,⟨𝜋��T `
`
��𝜋⟩ = 2m2𝜋
chiral limit−→ 0
Finding the Right Questions
• Progress can be accelerated and focused with the right questions.
Formulating and refining these questions is a goal for the meeting.
• On the workshop website we have outlined many related questions:
• What determines the QCD scale and how does it affect the visible
universe?
• What is the role of the trace anomaly in QCD? Does it reflect both
color confinement and dimensional transmutation?
• What is the role and interplay between chiral symmetry breaking and
color confinement in determining hadron masses?
• Can nucleon TMDs reveal the temperature at which
the nucleon is formed?
• What is the interplay between the Higgs and QCD
mass generation mechanisms?
• Can lattice QCD calculate the mass distribution in
the nucleon?
• These questions need to be distilled and likely new
questions added
How did we get here?
The 1st proton mass workshop “The Proton Mass: At the heart
of most visible matter” was held at Temple University on 28-29
March 2016. Organizers: Zein-Eddine Meziani and Jianwei Qiu
https://phys.cst.temple.edu/~meziani/proton-mass-workshop-2016
ECT*EUROPEAN CENTRE FOR THEORETICAL STUDIES
IN NUCLEAR PHYSICS AND RELATED AREASTRENTO, ITALY
Institutional Member of the European Expert Committee NUPECC
Castello di Trento (“Trint”), watercolor 19.8 x 27.7, painted by A. Dürer on his way back from Venice (1495). British Museum, London
The Proton Mass: At the Heart of Most Visible MatterTrento, April 3 - 7, 2017
Main TopicsHadron mass decomposition in terms of constituents:
Uniqueness of the decomposition, Quark mass, and quark and gluon energy contribution, Anomaly contribution, ...Hadron mass calculations:
Lattice QCD (total & individual mass components), Approximated analytical methods, Phenomenological model approaches, ...Experimental access to hadron mass components:
Exclusive heavy quarkonium production at threshold, nuclear gluonometry through polarized nuclear structure function, …
Confirmed speakers and participantsAlexandrou Constantia (Cyprus University), Brodsky Stan (SLAC), Burkardt Matthias (New Mexico State University), Chen Jian-Ping (Jefferson Lab),
Chudakov Eugene (Jefferson Lab), Cloët Ian (Argonne National Lab), de Teramond Guy (University Costa Rica), Deshpande Abhay (Stony Brook University), Eichmann Gernot (Giessen University), Hafidi Kawtar (Argonne National Lab), Hoelbling Christian (University of Wuppertal), Lin Huey-Wen (Michigan State University),
Liu Keh-Fei (University of Kentucky), Lorcé Cédric (École Polytechnique, Palaiseau), Mulders Piet (Vrije University of Amsterdam), Papavassiliou Joannis (Valencia University), Pascalutsa Vladimir (Johannes Gutenberg University of Mainz), Richards David (Jefferson Lab), Roberts Craig (Argonne National Lab),
Slifer Karl (University of New Hampshire), Mauro Anselmino (University of Torino & INFN), Bob Jaffe (Massachusetts Institute of Technology), Dima Kharzeev (Stony Brook University), Xiangdong Ji (University of Maryland).
Organizers Zein-Eddine Meziani (Temple University)
Barbara Pasquini (University of Pavia)Jianwei Qiu (Jefferson Lab)
Marc Vanderhaeghen (Universität Mainz)
Director of the ECT*: Professor Jochen Wambach (ECT*)
The ECT* is sponsored by the “Fondazione Bruno Kessler” in collaboration with the “Assessorato alla Cultura” (Provincia Autonoma di Trento),funding agencies of EU Member and Associated States and has the support of the Department of Physics of the University of Trento.
For local organization please contact: Gianmaria Ziglio - ECT* Secretariat - Villa Tambosi - Strada delle Tabarelle 286 - 38123 Villazzano (Trento) - ItalyTel.:(+39-0461) 314721 Fax:(+39-0461) 314750, E-mail: ect@ectstar.eu or visit http://www.ectstar.eu
The 2nd proton mass
workshop was held at
the ECT* on 3-7 April
2017. Organizers:
Zein-Eddine Meziani,
Barbara Pasquini,
Jianwei Qiu, and Marc
Vanderhaeghen
https://indico.jlab.
org/event/194/overview
NAS Assessment of a U.S.
based Electron Ion Collider
identified three high-priority
science questions (2018):
How does the mass of the nu-
cleon arise?
How does the spin of the nu-
cleon arise?
What are the emergent proper-
ties of dense systems of gluons?
Where are we going?
We will hold the 4th proton mass workshop at the Institute for Nuclear
Physics, titled Origin of the Visible Universe: Unraveling the Proton
Mass (20-77W), on 6-10 December 2021 [postponed from May 2020].
Organizers: Ian Cloet, Zein-Eddine Meziani, and Barbara Pasquini.
https://www.int.washington.edu/PROGRAMS/20-77W/
• A key goal of this workshop is to produce a White Paper
with the working title “Proton Mass: Origin and Perspective”
• We have a standing invitation to publish in the journal Report
on Progress in Physics
• The following people have agreed to serve as an Editor and
contribute to this publication: Constantia Alexandrou, Ian Cloet,
Xiangdong Ji, Dima Kharzeev, Zein-Eddine Meziani, Jen-Chieh
Peng, Jianwei Qiu, & Marc Vanderhaeghen
• We invite you to contribute a one-page write-up on your research and ideas related to the origin
of hadron mass. More on this at the end of the workshop. In the meantime, we invite you to send
key question(s) that you think best illuminate the origin of the proton mass (icloet@anl.gov)
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