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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Wilkinson, Ellie V <evwilk@wm.edu><br>
<b>Sent:</b> Friday, February 21, 2020 1:21 PM<br>
<b>To:</b> physics2017@physics.wm.edu <physics2017@physics.wm.edu><br>
<b>Cc:</b> undergrads2017@physics.wm.edu <undergrads2017@physics.wm.edu><br>
<b>Subject:</b> [EXTERNAL] Physics Colloquium for Monday, February 24, "Searching for exotic forms of hadronic matter at the COMPASS experiment" - Boris Grube</font>
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<b><u><span style="font-size:13.0pt; font-family:"Times New Roman",serif">Physics Colloquium</span></u></b><span style="font-size:13.0pt; font-family:"Times New Roman",serif">
<b>Boris Grube</b> [Host: D. Armstrong]<br>
Monday, February 24, 2020 Technical University of Munich<br>
4:00 PM <i><u>“Searching for exotic forms of hadronic matter at the COMPASS experiment”<br>
</u></i>Small Hall 111<i>
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ABSTRACT:</b><br>
Quantum Chromodynamics (QCD) describes the interaction of quarks via the exchange of gluons. A remarkable feature of QCD is that also the gluons, i.e. the force mediators, carry the charges of the strong interaction and hence do self-interact. At low energies,
this leads to the phenomenon of confinement, e.g. the entrapment of quarks and gluons into composite particles, the hadrons.</span></p>
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<span style="font-size:13.0pt; font-family:"Times New Roman",serif"> </span></p>
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<span style="font-size:13.0pt; font-family:"Times New Roman",serif">Although the QCD equations are simple to write down, they are very hard to solve in the confinement regime. A quantitative understanding of the phenomenon of confinement still poses considerable
theoretical and experimental challenges and is one of the key issues in particle physics.</span></p>
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<span style="font-size:13.0pt; font-family:"Times New Roman",serif">The study of the excitation spectrum of hadrons has provided essential clues that helped to develop QCD, but also still leaves a number of deep puzzles. In the constituent quark model, hadrons
are either combinations of three quarks, which are called baryons, or quark-antiquark states, which are called mesons. However, QCD in principle allows for more complicated hadronic states like multi-quark states (e.g. molecule-like objects), states with excited
gluonic fields (hybrids), or even purely gluonic bound states (glueballs).</span></p>
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<span style="font-size:13.0pt; font-family:"Times New Roman",serif">The hunt for these so-called exotic hadrons is a world-wide experimental effort. The COMPASS experiment at CERN has collected world-leading datasets that allow us to study the spectrum of mesons
that are composed of the three lightest quarks (up, down, and strange) with unprecedented detail and precision. I will present selected results from the analysis of these data with a focus on the search for exotic mesons.<br>
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</span><b><span style="font-size:12.0pt; font-family:"Times New Roman",serif"> Open to the public<br>
</span></b><i><span style="font-size:12.0pt; font-family:"Times New Roman",serif"> ***Cookies & Coffee will be served in Small Hall 122 at 3:30***</span></i></p>
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<span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:#1F4E79">Cheers,</span></p>
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<span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:#1F4E79">Ellie Wilkinson</span></p>
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<span style="font-size:12.0pt; font-family:"Times New Roman",serif; color:#1F4E79">William & Mary Physics<br>
Administrative Coordinator</span><span style="color:#1F4E79"></span></p>
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