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 1WHA: Hadron Structure I |
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Chair: Anselm Vossen, Duke University Room: Hilton Kohala 4 |
Tuesday, October 23, 2018 9:00AM - 9:30AM |
1WHA.00001: Investigating Hadronization and Nucleon Structure Through Hadrons Within Jets from Proton-Proton Collisions Invited Speaker: James Drachenberg Over the last decade, theoretical and experimental engagement have unlocked tantalizing opportunities for new insight into QCD and nucleon structure. The production of hadrons within jets has been proposed as a new probe to investigate these phenomena in proton+proton collisions, e.g. to provide further insight into distributions such as quark transversity and gluon fragmentation functions. Recent data from polarized proton collisions have yielded the first observations of transverse single-spin asymmetries in the azimuthal distributions of hadrons within jets, sensitive to transversity and the Collins fragmentation function. Recent unpolarized datasets promise improved constraints on collinear and TMD fragmentation functions. These and additional datasets pave the way for new global analyses to expand the frontier of knowledge of QCD, nucleon structure, and hadronization. |
Tuesday, October 23, 2018 9:30AM - 10:00AM |
1WHA.00002: Overview of fragmentation function measurements Invited Speaker: Guan Yinghui Fragmentation functions describe how quasi-free, high energetic partons fragment into a number of confined final state hadrons. The precise knowledge of fragmentation functions is necessary for our understanding of hard scattering processes. Studying electron-positron annihilation provides the cleanest access to fragmentation functions. This talk will give an overview of the latest experimental results about fragmentation functions, such as the measurement of transverse polarization of lambda hyperons, invariant-mass and fractional-energy dependence of inclusive production of di-hardons and the production rate of hyperons and charmed baryons. An outlook towards the study of hadronization at the Belle II experiment which will take data at SuperKEKB will also be presented. |
Tuesday, October 23, 2018 10:00AM - 10:30AM |
1WHA.00003: Progress on eRHIC Design Invited Speaker: Ferdinand Joachim Willeke The nuclear physics community endorses strongly the construction of an Electron Ion Collider (EIC). The US nuclear physics community published a White Paper [1] which requires an EIC with a luminosity of 1033cm-2s-1 - 1034cm-2s-1, a center of mass energy range of 29-140 GeV, high longitudinal spin polarization of ~70% in both hadron and electron beams, and a large detector acceptance. BNL is proposing eRHIC which makes use on the existing RHIC ion-ion collider complex with the addition of an 5-18 GeV electron storage ring and an 18 GeV rapid cycling injector synchrotron. A SLAC-type polarized electron source provides the polarized electron bunches for the electron storage ring. The design parameters ask for 1-2.5 amps of electron beam current and 1 amp of hadron beam current. Both beams are flat in collisions (horizontal size larger than the vertical one) and the beam-beam parameters correspond to values as have been demonstrated in Hadron-Hadron collision (hadron beam-beam tune shift Dn =0.012) and lepton-lepton collisions (Dn =0.1) respectively. The electron storage ring needs superconducting cavities with variable coupling high power input couplers. The most challenging feature of eRHIC is strong hadron cooling which is based on micro-bunched coherent electron cooling, a novel electron cooling technique. This is required to reach the highest luminosity of 1034cm-2s-1. Without cooling the luminosity still reaches 4.4 x 1033cm-2s-1, well within the range given by the White Paper. The design team has completed the preconceptual design, the conceptual design process is underway. The present paper gives an overview and reports on the status of eRHIC development [1] A. Accardi et al., “Electron Ion Collider: The Next QCD Frontier,” Eur. Phys. J., vol. A52, no. 9, p. 268, 2016 |
Tuesday, October 23, 2018 10:30AM - 11:00AM |
1WHA.00004: COFFEE BREAK
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