Speaker
Description
The Relativistic Heavy Ion Collider (RHIC) is the world’s only polarized proton collider, capable of reaching center of mass energies up to 510 GeV. The STAR experiment has been carrying out a cold QCD program, to gain deeper insight into the spin structure and dynamics of the proton. The collection of longitudinally polarized data concluded in 2015. One of the goals of this data is to study the gluon helicity distribution function (∆g($x$)), by measuring the longitudinal double-spin asymmetry (A$_{LL}$) of jets. Measurements were taken at √s = 200 GeV and 510 GeV with different topological configurations in pseudorapidity (η), to maximize the kinematic coverage in momentum fraction ($x$) down to ~0.01 and to better constrain the shape of ∆g($x$). On the other side, the transversely polarized proton collisions at RHIC enable the studies of the transverse spin structure, such as the transversity and Sivers distributions, as well as polarized fragmentation functions. These studies can be used to test universality, and given STAR’s wide kinematic range, also aid in constraining transverse momentum dependent evolution effects. In this talk, we present the recent STAR measurements for longitudinal and transverse polarization, besides selected unpolarized results. STAR is currently installing a suite of new sub-detectors in the forward region (2.5 < η < 4). How those upgrades will supplement previous STAR measurements will also be briefly discussed.
Details
Amilkar Quintero
Post Doc
Temple University
USA
| Is this abstract from experiment? | Yes |
|---|---|
| Name of experiment and experimental site | STAR |
| Is the speaker for that presentation defined? | Yes |
| Internet talk | Maybe |
