25th International Spin Symposium (SPIN 2023)

Session

Joint GPD/Future

Sep 26, 2023, 9:22 AM

Meeting Room 3-4 (Durham Convention Center)

Conveners

Joint GPD/Future: Joint GPD/Future I

• Jan Matoušek (Charles University (Prague, CZ))

Joint GPD/Future: Joint GPD Future II

• Charlotte Van Hulse (UAH)

185. Threshold charmonium photoproduction with GlueX

Lubomir Pentchev (Jefferson Lab)

9/26/23, 9:22 AM

Future Facilities and Experiments

Talk

We report the total and differential cross sections for $J/\psi$ photoproduction with the large acceptance GlueX spectrometer at the 12 GeV JLab accelerator over the full near-threshold kinematic region. The GlueX experiment uses tagged linearly-polarized photon beam from coherent Bremsstrahlung off thin diamond. The charmonium photoproduction near threshold, under certain assumptions...

108. Deep Exclusive Meson Production as a probe to the puzzle of $\Lambda$ hyperon polarization

Zhoudunming Tu (BNL)

9/26/23, 9:44 AM

3D Structure of the Nucleon: GPDs and Form Factors

Talk

In the 1970s, the unexpected discovery of transverse $\Lambda$ polarization in unpolarized proton-Beryllium collisions marked the beginning of investigating spin phenomena in high-energy physics. Over the past 50 years, similar transverse $\Lambda$ polarization has been observed in various collision systems, including hadron-hadron collisions, lepton-hadron deep inelastic scattering, and...

42. Opportunities with the polarized internal target at EIC

Dr Bogdan Wojtsekhowski (Jefferson Lab)

9/26/23, 10:06 AM

3D Structure of the Nucleon: GPDs and Form Factors

Talk

A fixed target experiment, HERACLES, similar to HERMES but with 500 times higher figure-of-merit, at EIC will allow a big advance in hadron physics. The internal target with the polarized hadron beam has an important physics program. The high intensity photon beam will allow to study photo-production of the excited states and recently discovered XYZ states. We will present the analysis of...

157. Exclusive Lepton Pair Production at the Electron-Ion Collider

Krzysztof Piotrzkowski (AGH UST)

9/26/23, 11:00 AM

3D Structure of the Nucleon: GPDs and Form Factors

Talk

The two-photon exclusive production of lepton pairs at the Electron-Ion Collider will open interesting research directions thanks to a very high luminosity and clean experimental conditions. A survey of the scientific potential of such studies is reported. In particular, we consider unique measurements of the proton elastic electromagnetic...

109. Future measurements of TCS at JLab Hall C

Debaditya Biswas (Virginia Tech)

9/26/23, 11:22 AM

3D Structure of the Nucleon: GPDs and Form Factors

Talk

In this talk, we will discuss future experiments we are developing for measuring Timelike Compton Scattering (TCS) at JLab Hall C. The first experiment will measure transversely polarized target spin asymmetries off a NH$_{3}$ target. The second one is using an unpolarized hydrogen target and a circularly polarized photon beam, aiming at a high statistics measurement of TCS unpolarized and...

90. Can we measure Double DVCS at JLab and the EIC?

Victor Martinez-Fernandez (National Centre for Nuclear Research (NCBJ))

9/26/23, 11:44 AM

3D Structure of the Nucleon: GPDs and Form Factors

Talk

Generalized parton distributions (GPDs) are off-forward matrix elements of quark and gluon operators that enclose information on the total angular momentum of partons, and so on the spin of hadrons (cf. EMC measurements and spin puzzle). In addition, GPDs enable tomography of the nucleon allowing to study spatial distribution of partons as a function of their momentum. To access GPDs one needs...

72. DDVCS experiment in Hall A at Jefferson Lab

Marie BOER (Virginia Tech)

9/26/23, 12:06 PM

3D Structure of the Nucleon: GPDs and Form Factors

Talk

Double deeply virtual Compton scattering (DDVCS), corresponding to the scattering of a virtual photon off a quark, followed by the emission of a photon of a different virtuality (decaying into leptons), allows for a unique access to the Generalized Parton Distributions (GPDs) in the ERBL region. The main advantage of DDVCS is enabling the decorrelation between the x and $\xi$ dependence of...

218. GPDs at future JLab, complementarity with EIC

Francois-Xavier Girod (UConn)

3D Structure of the Nucleon: GPDs and Form Factors

Talk

Generalized Parton Distributions (GPDs) parameterize the non-perturbative part of the amplitudes for deep exclusive hadronic processes, and encode partonic information simultaneously in longitudinal momentum and transverse impact parameter position.
Particular interest in accessing GPDs comes from the information they contain on the quark and gluon energy momentum tensors, potentially...