Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session 2WFB: Hadron Structure IV |
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Chair: Wally Melnitchouk, Jefferson Laboratory Room: Hilton King's 2 |
Tuesday, October 23, 2018 4:00PM - 4:30PM |
2WFB.00001: Generalized parton distributions for the deep QCD structure of the nucleon and its transitions Invited Speaker: Kazuhiro Tanaka We introduce the generalized parton distributions (GPDs) of the nucleon and the transition GPDs, and summarize the physical meanings as well as important properties implied directly and indirectly from their QCD definitions. Hard nucleon scattering/transition processes to probe those GPDs relevant to ongoing and future experiments are explained and some illustrative examples are presented, demonstrating what deep structure of the nucleon, and its transitions to other baryons, are about to be revealed through theoretical and experimental efforts toward those processes. We also briefly mention a recent topic on the gravitational form factors parameterizing the nucleon matrix element of the QCD energy-momentum tensor, and their relations to the GPDs, such that the measurements of the GPDs allow the determination of the behaviors of gravitational form factors. |
Tuesday, October 23, 2018 4:30PM - 5:00PM |
2WFB.00002: Higher twist fragmentation functions related to the spin asymetries Invited Speaker: Shinsuke Yoshida The large single-transverse spin asymmetries(SSAs) were first observed in pion production and polarized lambda production in '70s. Because the conventional perturbative QCD calculation failed to predict such large asymmetries in high energy hadron scatterings, the development of the perturbative QCD framework was needed to describe the large SSAs. The higher twist approach in the collinear factorization framework have been well developed in the past decades as a successful framework to reproduce the large SSAs observed in the hadronic scattering processes like proton-proton collision in RHIC. The origin of the SSA has been a controversial issue. Much theoretical effort has been devoted in order to answer the question "Which is dominant, the distribution contribution or the fragmentation contribution ?". Recent numerical simulations suggested that the fragmentation contribution can be a dominant source of the large SSAs. This result motivated a lot of theoretical work to calculate an accurate magnitude of the fragmentation contribution in order to clarify the origin of the SSAs observed in both the pion production and the polarized lambda production. In this talk, I will present recent significant theoretical developments in the perturbative QCD calculation for the higher twist fragmentation contributions, leading-order result for the spin-dependent cross section, scale evolution equations of the twist-3 fragmentation functions and the first calculation of the next-leading order contribution to the cross section. |
Tuesday, October 23, 2018 5:00PM - 5:30PM |
2WFB.00003: Fragmentation of hadrons in jets - theory Invited Speaker: Felix Ringer Collimated jets of hadrons and their substructure play a crucial role at present day and future collider experiments such as the LHC, RHIC and the EIC. One of the most frequently studied observables is the energy distribution of hadrons inside jets. On the one hand, identified hadrons can be used to precisely map out the energy distribution inside jets both in the longitudinal and transverse direction with respect to the jet axis. On the other hand, new insights into the QCD hadronization mechanism can be obtained allowing for precise extractions of fragmentation functions. By studying hadrons inside a reconstructed jet, these new observables capture additional information about the final state event topology compared to traditional hadron spectra. In this talk, I review the significant progress that has been made recently from the theoretical side. |
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