[A1n_d2n] Fw: [eicug-users] CTEQ Webinar on the new SeaQuest results on March 24th

[Xiaochao Zheng]

________________________________
From: Bernd Surrow <surrow at temple.edu>
Sent: Thursday, March 18, 2021 11:46 AM
To: eicug-users at eicug.org <eicug-users at eicug.org>
Subject: [eicug-users] CTEQ Webinar on the new SeaQuest results on March 24th


Dear Colleagues,

We are pleased to announce the first CTEQ Webinar (via Zoom and YouTube Live) with Paul Reimer giving a
colloquium-level talk on the recent SeaQuest results that were published in Nature. Please feel free to forward
this email to anyone who may be interested.

Thank you,

Pavel and Huey-Wen

——————————————————————————————————————————————————————
Date/Time: March 24th 8:30AM CDT/9:30AM EDT

Speaker: Paul Reimer (Argonne National Laboratory)

Title: The asymmetry in the antimatter of the proton

Abstract:

For over 40 years we have understood protons as bound states of quarks and gluons interacting through the strong force,
described by Quantum Chromodynamics (QCD). At large energy scales, perturbative QCD successfully describes the strong
interaction, yet our understanding of the dynamics that form a physical proton from quarks and gluons is, at best, poor. Both
experiment and theory fail to explain basic properties including the proton spin, mass, or the flavor composition of the antiquark
sea. Contrary to naive assumptions, a remarkable asymmetry between the anti-down d and anti-up u quarks has been observed.
This asymmetry cannot be generated through perturbative QCD and demonstrates that at any energy scale, there is a fundamental
anti-quark component in the proton. The Drell-Yan reaction is uniquely sensitive to antiquark distributions of the interacting hadrons
because the reaction requires an anti-quark in one of the initial state hadrons. With the kinematics of the SeaQuest spectrometer,
it is particularly sensitive to the anti-quarks of the target nuclei. The E906/SeaQuest collaboration has measured the ratio of
deuterium to hydrogen Drell-Yan cross sections. From these data, we have extracted the ratio of \bar d/\bar u, as a function of the
fraction of the proton's momentum that is carried by the interacting quark, xBj.  These data extend the range of previous measurements
to larger xBj. I will also highlight other continuing analyses future Drell-Yan measurements at Fermilab.

Zoom Webinar Link
https://msu.zoom.us/j/98237446129<https://urldefense.proofpoint.com/v2/url?u=https-3A__msu.zoom.us_j_98237446129&d=DwMF-g&c=CJqEzB1piLOyyvZjb8YUQw&r=h0ddwZahF7UudlBHJ5C8U0UdF0FQd7mWAANW-z6-AOM&m=AM3q_6PiFUxHqIW7wrfHhqzUOqgiYkIeGH2REbsiRfw&s=s_V_CfiHgipgXz0ISoXx1-0asddKiN06ALqK-jjyH2E&e=> (passcode: 416959)

YouTube Live:
https://youtu.be/GAdQDhvyI8w<https://urldefense.proofpoint.com/v2/url?u=https-3A__youtu.be_GAdQDhvyI8w&d=DwMF-g&c=CJqEzB1piLOyyvZjb8YUQw&r=h0ddwZahF7UudlBHJ5C8U0UdF0FQd7mWAANW-z6-AOM&m=AM3q_6PiFUxHqIW7wrfHhqzUOqgiYkIeGH2REbsiRfw&s=rnlWxDyXCsCTezTYt8GO9AD-UddBQ5j-xmxvv1WZO50&e=>
——————————————————————————————————————————————————————

Prof. Huey-Wen Lin (she/her/hers)
Department of Physics and Astronomy & Computational Mathematics, Science and Engineering
Michigan State University

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