[Theory-seminars] Fwd: Physics Colloquium Friday, November 21, 2014 - “The E-906/SeaQuest Experiment at Fermilab” - Dr. Markus Diefenthaler

[Mary Fox]

-------- Original Message --------
Subject: 	Physics Colloquium Friday, November 21, 2014 - “The 
E-906/SeaQuest Experiment at Fermilab” - Dr. Markus Diefenthaler
Date: 	Mon, 17 Nov 2014 17:32:04 +0000
From: 	Wilkinson, Eleonor V <evwilk at wm.edu>
To: 	'physics0607 at physics.wm.edu' <physics0607 at physics.wm.edu>
CC: 	'undergrads0607 at physics.wm.edu' <undergrads0607 at physics.wm.edu>



*_PHYSICS COLLOQUIUM_*

Friday, November 21, 2014

4:00 PM

Small Hall, Room 111

*Dr. Markus Diefenthaler *[Host: W. Deconinck]

University of Illinois-Urbana

*Title of Talk:*

/"The E-906/SeaQuest Experiment at Fermilab" /

*Abstract:*

The nucleon is one the the fundamental building blocks of the visible 
universe. But many of its properties and how those properties can be 
deduced from its inner structure are not well understood. Deep-inelastic 
scattering (DIS) experiments have revealed that the inner structure of 
the nucleon consists of relativistic quarks that exchange gluons, and 
have established quantum chromodynanics (QCD) as the theory of the 
strong interaction between quarks and gluons. Due to the confinement 
feature of the strong interaction and the relativistic nature of the 
system, we cannot yet explain many properties of the nucleon from first 
principles. Our knowledge of the inner structure of the nucleon is to a 
large extent based on the measurement of electroweak processes such as 
DIS or the Drell-Yan process, which can be interpreted within QCD.

The E-906/SeaQuest experiment at Fermilab continues a series of 
Drell-Yan measurements to explore the antiquark content of the nucleon 
and to study the modifications to nucleon structure when the nucleon is 
embedded into a nuclei. To extend existing measurements to larger values 
of Bjorken-x - the momentum fraction of a quark within the nucleon - a 
120 GeV proton beam extracted from Fermilab’s main injector is used, 
resulting in 50 times more luminosity than previous experiments and 
enabling access to values of x up to 0.9.

An overview will be presented of the key physics goals of the SeaQuest 
collaboration: These include investigation of the dramatic dbar/ubar 
flavor asymmetry in the nucleon sea and its behavior at high x; study of 
the EMC effect in Drell-Yan scattering and the unexpected absence of any 
antiquark excess in existing data; and measurements of the angular 
dependence of the Drell-Yan process, sensitive to spin-orbit 
correlations within the nucleon. Updates to the SeaQuest experiment with 
polarized beam (E-1027) and target (E-1039) will allow us to study the 
quarks' spin-orbit correlations within the nucleon and to provide 
complementary information to existing data from DIS. The talk will 
conclude with a status report on the ongoing data taking and analysis of 
this new experiment.

*/*Cookies & coffee will be served in Room 122 at 3:30 PM/*

******

*Eleonor V. Wilkinson*

Administrative & Office Specialist

The College of William & Mary-Physics
Small Hall, Room 123
300 Ukrop Way
Williamsburg, VA 23185

Telephone: 757-221-3503

Fax: 757-221-3540



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