Physics case for quarkonium studies at the Electron Ion Collider
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDSโ
Engineering topics
Metz, Andreas
Publications and source records attributed to Metz, Andreas.
Shedding light on shadow generalized parton distributions
The feasibility of extracting generalized parton distributions (GPDs) from deeply virtual Compton scattering (DVCS) data has recently been questioned because of the existence of an infinite set of so-called โshadow GPDsโ (SGPDs). These SGPDs depend on the process and manifest as multiple solutions (at a fixed scale ๐ 2 ) to the inverse problem that needs to be solved to infer GPDs from DVCS data. SGPDs therefore pose a significant challenge for extracting GPDs from DVCS data. With this motivation we study the extent to which QCD evolution can provide constraints on SGPDs. This is possible because the known classes of SGPDs begin to contribute to observables after evolution, and can then be constrained (at the input scale ๐$^{2}_{0}$) by data that has a finite ๐ 2 range. The impact that SGPDs could have on determining the total angular momentum, pressure and sheer force distributions, and tomography is also discussed. We find that ๐ 2 evolution, given empirical data over a wide range of skewness (๐ ) and ๐ 2 scales, constrains the SGPDs studied at low ๐ฅ and low ๐. If this finding generalizes to all SGPDsโand we have not been able to find any SGPDs with qualitatively different behaviorโthen this potentially makes extraction of GPDs from DVCS possible over a limited range of ๐ฅ and ๐.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDSโ
The case for an EIC Theory Alliance: Theoretical Challenges of the EIC
We outline the physics opportunities provided by the Electron Ion Collider (EIC). These include the study of the parton structure of the nucleon and nuclei, the onset of gluon saturation, the production of jets and heavy flavor, hadron spectroscopy and tests of fundamental symmetries. We review the present status and future challenges in EIC theory that have to be addressed in order to realize this ambitious and impactful physics program, including how to engage a diverse and inclusive workforce. In order to address these many-fold challenges, we propose a coordinated effort involving theory groups with differing expertise is needed. We discuss the scientific goals and scope of such an EIC Theory Alliance.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDSโ
The gravitational form factors of the electron in quantum electrodynamics
Not Available
73 NUCLEAR PHYSICS AND RADIATION PHYSICSโ
The Case for an EIC Theory Alliance
This documents outlines the case for the creation of an EIC Theory Alliance. The EIC will be a unique and versatile facility that will enable the understanding of some of the most compelling questions in the physics of the strong nuclear force. To fully exploit the potential of the EIC, a focused theory effort will be required. The goal of the EIC Theory Alliance is to provide support and stewardship of the theory effort in EIC physics, broadly defined, over the lifetime of the facility. It will promote EIC theory and contribute to workforce development through: support of graduate students; EIC Theory Fellowships for postdocs; bridge positions at universities; and short and long term visitor programs to enhance collaboration between groups. In addition, the alliance will organize topical schools and workshops. The EIC Theory Alliance will be a decentralized organization, open to participation by anyone in the community who is interested in EIC physics, i.e., it will be a membership organization, where members elect an executive board which will effectively run the alliance. The executive board will determine the major scientific thrusts of the theory alliance, make decisions regarding at which universities bridge faculty positions will be created, and serve as a search committee for EIC-related positions. Furthermore, the executive board will coordinate the organization of workshops and schools related to the research activities of the alliance. In addition, the EIC theory alliance will seek out and nurture international cooperation to maximally leverage the available funding. The EIC theory alliance has a wider range of physics goals and longer lifetime, commensurate with that of the EIC research program, than individual nuclear theory topical collaborations. The structure of the EIC Theory Alliance will build on previous examples of successful alliances in nuclear theory.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDSโ