[Jlab-seminars] Physics Seminar: Kalyan Allada; "Study of 3D Partonic Structure of Nucleon"

[Stephanie Tysor]

*Physics Seminar*

*Kalyan Allada*

*Massachusetts Institute of Technology*


**

/"Study of 3D Partonic Structure of Nucleon"/

Abstract//


Our understanding of the nucleon spin structure is still far from 
complete. Although we know much about quark's momentum and helicity 
distributions, we are just beginning to understand quark's transverse 
spin distribution inside a nucleon. Quark transverse-spin and 
transverse-momentum effects were observed in a variety of processes in 
high energy e-p and p-p reactions. Semi-inclusive Deep Inelastic 
Scattering (SIDIS) process is one of the powerful ways to measure these 
effects, and it also allows us to cleanly separate different terms 
associated with them in the cross section. In particular, the single and 
double spin asymmetries obtained from SIDIS reaction on a polarized 
nucleon target are sensitive to the transverse-momentum dependent parton 
distribution functions (TMDs). I will present some recent results of 
transverse spin asymmetries in both SIDIS and inclusive single-hadron 
production reactions, along with unpolarized SIDIS cross-sections 
obtained from the 6 GeV Hall A transversity experiment at JLab. These 
asymmetries were measured in the valence-x region for charged hadrons 
using a polarized helium-3 target. I will also describe our studies for 
the future precision experiments at JLab using polarized proton/helium-3 
targets and the proposed Solenoidal Large Intensity Device (SoLID) in 
Hall-A. These experiments will cover a wide range of kinematics in all 
four dimensions (x,Q^^2 ,p_T,z) which is very crucial for extracting 
TMDs and to provide a 3D partonic picture of the nucleon in the momentum 
space.

*Thursday, October 6, 2016*

*9:00 am*

*CEBAF Room L102*

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