[Jlab-seminars] Today's Physics Seminar: Arun Tadepalli; Anti-quark structure of Nucleons and Nuclei at the SeaQuest Experiment

[Stephanie Tysor]

Physics Seminar
Arun Tadepalli

Rutgers University

Anti-quark structure of Nucleons and Nuclei at the SeaQuest Experiment

Abstract:

SeaQuest is a fixed target experiment aimed at studying the anti-quark structure of nucleons and nuclei. The experiment uses a 120 GeV/c proton beam extracted from the Main Injector at Fermilab to collide with several cryogenic (liquid hydrogen and liquid deuterium) and solid targets (carbon, iron and tungsten). To specifically probe the anti-quark structure, SeaQuest takes advantage of the Drell-Yan process in which, quark from one hadron annihilates with an anti-quark from another hadron, producing a virtual photon which eventually decays into a dilepton. The SeaQuest forward spectrometer is designed to detect such dimuons. Ratio of cross-sections of the interaction of proton beam on liquid deuterium and liquid hydrogen targets allows SeaQuest to map out dbar(x)/ubar(x) up to a region of ~0.45 in Bjorken-x, thereby enriching our understanding of the nucleon sea. Similarly, ratio of cross sections of carbon, iron, and tungsten to liquid deuterium will help map out the anti-shadowing and EMC region thereby shedding light on the nuclear dependence of anti-quarks in nuclei. After a brief commissioning run, the experiment began data taking in 2013 and successfully finished in 2017. Current status of the measurements and their impact on understanding the anti-quark structure of nucleons and nuclei will be presented in this talk.



Wednesday, January 23, 2019
2:00pm
CEBAF Center F113




Stephanie Tysor
Thomas Jefferson National Accelerator Facility
Physics Division
Hall A Administrative Assistant
(office)757-269-6005<callto:757-269-6005> (fax)757-269-5235<callto:757-269-5235>

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