# Nuclear Physics Seminars

Join Zoom Meeting:
##### Meeting ID: 3993936949

Tuesday, September 29, 2020
3:30 PM
Online, Room via Zoom
Note special room.

## "Measurement of flavor asymmetry of light antiquarks in the proton at Fermilab SeaQuest "

Kenichi Nakano , Tokyo Tech
[Host: Dustin Keller]
ABSTRACT:
The proton is commonplace in the world but contains rich information about how matter is constructed by the strong force.  It is described by the parton picture, namely a system made of quarks, antiquarks and gluons, when it is observed in short range such as high-energy scattering.  The proton is the best object to investigate the dynamics of the strong force (i.e. QCD) since it is the simplest stable system bound by the strong force.  Particularly the antiquarks in the proton are of great interest because they are all dynamically created by the strong force.  They are thus sensitive to mechanisms beyond the simple quark model where the proton is composed of only three quarks.

SeaQuest is a fixed-target experiment using the 120-GeV proton beam at Fermilab.  It detects the Drell-Yan process in proton + proton and proton + deuteron scatterings; quark + antiquarks -> gamma^* -> mu^+ + mu^-. It primarily aims at measuring the flavor asymmetry of light antiquarks, namely the difference between antiup and antidown quarks in their distributions in the proton.  Several mechanisms that can induce this asymmetry have been theoretically proposed.

In this seminar, the physics motivation and the measurement principle of SeaQuest are explained.  Then the detector construction, data analysis and experimental results are presented.

To add a speaker, send an email to phys-speakers@Virginia.EDU. Please include the seminar type (e.g. Nuclear Physics Seminars), date, name of the speaker, title of talk, and an abstract (if available).