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A reminder all, TODAY we will hear from <span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Abhishek Mohapatra of Duke University in the semester's first High Energy seminar. Please
join us!</span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><br>
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Monday, September 16th</div>
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3:30 PM</div>
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Room 4138, Physics Research Building</div>
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Speaker: Dr. Abhishek Mohapatra</div>
<div style="margin: 0px; font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255)">
Title: Double Heavy Baryons and Corrections to Heavy Quark-Diqquark Symmetry</div>
<div style="margin: 0px; font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255)">
Abstract: Doubly heavy baryons (QQq) and singly heavy antimesons $( \bar{Q} q)$ are related by the heavy quark-diquark (HQDQ) symmetry because in the heavy quark limit, the light degrees of freedom in both the hadrons are expected to be in identical configurations.
Hyperfine splittings of the ground states in both systems are nonvanishing at ${\cal O}(1 / m_Q)$ in the heavy quark mass expansion and HQDQ symmetry relates the hyperfine splittings in the two sectors. In this talk, I will point out the existence of both
perturbative and nonperturbative corrections to leading hyperfine splitting from HQDQ symmetry. The perturbative correction scales in powers of $\alpha_S$ and nonperturbative correction scales in powers of $\Lambda_QCD/m_Q$. In the extreme heavy quark limit
in which the potential between the quarks in the diquark is Coulombic, the perturbative correction to the hyperfine splittings is only a few percents or smaller for values of $\alpha_S$ relevant to doubly charm and doubly bottom systems. We also argue that
nonperturbative corrections to the prediction for the hyperfine splittings are suppressed by $(Ë_QCD/m_Q)^2$ which leads to hyperfine splitting corrections of order 10% in the charm sector and smaller in heavier systems. Eventually, I will compare my results
to the lattice calculations for hyperfine splittings.</div>
<div style="margin: 0px; font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255)">
<br>
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<div style="margin: 0px; font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255)">
-Brian</div>
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</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Francis, Brian<br>
<b>Sent:</b> Monday, September 9, 2019 8:37 AM<br>
<b>To:</b> 'physics-all@lists.osu.edu' <physics-all@lists.osu.edu><br>
<b>Subject:</b> HET/HEE Seminar September 16th: Abhishek Mohapatra</font>
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Hello everyone,</div>
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One week from today we will begin the High Energy seminar series with Abhishek Mohapatra of Duke University. Please join us for our first seminar of the semester, and give Dr. Mohapatra a warm welcome!</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Monday, September 16th</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
3:30 PM</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Room 4138, Physics Research Building</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Speaker: Dr. Abhishek Mohapatra</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Title: Double Heavy Baryons and Corrections to Heavy Quark-Diqquark Symmetry</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Abstract: Doubly heavy baryons (QQq) and singly heavy antimesons $( \bar{Q} q)$ are related by the heavy quark-diquark (HQDQ) symmetry because in the heavy quark limit, the light degrees of freedom in both the hadrons are expected to be in identical configurations.
Hyperfine splittings of the ground states in both systems are nonvanishing at ${\cal O}(1 / m_Q)$ in the heavy quark mass expansion and HQDQ symmetry relates the hyperfine splittings in the two sectors. In this talk, I will point out the existence of both
perturbative and nonperturbative corrections to leading hyperfine splitting from HQDQ symmetry. The perturbative correction scales in powers of $\alpha_S$ and nonperturbative correction scales in powers of $\Lambda_QCD/m_Q$. In the extreme heavy quark limit
in which the potential between the quarks in the diquark is Coulombic, the perturbative correction to the hyperfine splittings is only a few percents or smaller for values of $\alpha_S$ relevant to doubly charm and doubly bottom systems. We also argue that
nonperturbative corrections to the prediction for the hyperfine splittings are suppressed by $(Ë_QCD/m_Q)^2$ which leads to hyperfine splitting corrections of order 10% in the charm sector and smaller in heavier systems. Eventually, I will compare my results
to the lattice calculations for hyperfine splittings.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
-Brian</div>
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