Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session D09: Meson Electro- and Photo-production
3:30 PM–5:18 PM,
Saturday, April 13, 2019
Sheraton
Room: Governor's Square 11
Sponsoring
Units:
DNP GHP
Chair: Latifa Elouadrhiri, Jefferson Lab
Abstract: D09.00002 : Onset of the Color Transparency (CT) in Protons at 12 GeV in Hall C at Jefferson Lab (JLab)*
3:42 PM–3:54 PM
View Presentation Abstract
Presenter:
Deepak K Bhetuwal
(Mississippi State University)
Author:
Deepak K Bhetuwal
(Mississippi State University)
Collaboration:
Thanks to Prof. Dipangkar Dutta for his kind help throughout, Dr. Holly Szumila-Vance, Dr. Latiful Kabir, John Matter and to the entire CT collaboration team for their continuous support.
CT is a unique prediction of QCD where the final (and/or initial) state interactions of hadrons with the nuclear medium are suppressed for exclusive processes at high momentum transfers. While this phenomenon has been observed for mesons, there has never been a conclusive observation for baryons. A clear signal of CT for baryons would be the first evidence of baryons fluctuating to a small size in the nucleus, and the onset would show the transition from partonic picture to quark-gluon degrees of freedom.
The experiment E12-06-107 searching for the onset of CT in protons, was completed in Hall C at JLab using the recently upgraded 12 GeV e- beam. It used HMS and new SHMS spectrometers in coincidence to measure the 12C(e,e’p) proton knockout reaction. Data were collected on a 12C target over the range of Q2 = 8 – 14.3 (GeV/c)2 covering the region where a previous A(p,2p) experiment at BNL had observed an enhancement. Additional data on a 1H target were collected to determine the elementary process. A rise in the Proton Transparency (PT) as a function of Q2 is predicted to be a signature of the onset of CT.
This talk will summarize the status of the analysis and present preliminary results on hydrogen normalization and nuclear transparency.
*U.S. DOE Grant # DE-FG02-07ER41528
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