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Apr 13 – 16, 2021
US/Eastern timezone

First Analysis of the World Polarized DIS Data in the Small-x Dipole Formalism

Apr 16, 2021, 1:30 PM
20m

Speaker

Matthew Sievert (Brookhaven National Laboratory)

Description

We present a Monte-Carlo-based analysis in the Jefferson Lab Angular Momentum (JAM) Collaboration framework of the combined world polarized deep-inelastic scattering (DIS) data at moderately small values of the Bjorken $x$ variable using spin-dependent quark dipoles. We demonstrate that the world data on the double-spin asymmetries $A_{||}$ and $A_1$ at $x<0.1$ can be successfully described in this framework with Born-level initial conditions and in the limit of a large number of quark colors. This is the first ever phenomenological demonstration that global polarized DIS data at small $x$ can be fit solely by evolving spin-dependent quark dipoles. In addition, we assess the impact of the data to be collected at the Electron-Ion Collider on our knowledge of these observables, including the potential role of parity-violating DIS.

Primary authors

Daniel Adamiak (The Ohio State University) Yuri Kovchegov (The Ohio State University) Wally Melnitchouk (Jefferson Lab) Daniel Pitonyak (Lebanon Valley College) Nobuo Sato (ODU) Matthew Sievert (Brookhaven National Laboratory)

Presentation materials