HET/HEE Seminar September 16th: Abhishek Mohapatra

[Francis, Brian]

A reminder all, TODAY we will hear from Abhishek Mohapatra of Duke University in the semester's first High Energy seminar. Please join us!

Monday, September 16th
3:30 PM
Room 4138, Physics Research Building

Speaker: Dr. Abhishek Mohapatra
Title: Double Heavy Baryons and Corrections to Heavy Quark-Diqquark Symmetry
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 $(Λ_QCD/m_Q)^2$ 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.

-Brian

________________________________
From: Francis, Brian
Sent: Monday, September 9, 2019 8:37 AM
To: 'physics-all at lists.osu.edu' <physics-all at lists.osu.edu>
Subject: HET/HEE Seminar September 16th: Abhishek Mohapatra

Hello everyone,

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!

Monday, September 16th
3:30 PM
Room 4138, Physics Research Building

Speaker: Dr. Abhishek Mohapatra
Title: Double Heavy Baryons and Corrections to Heavy Quark-Diqquark Symmetry
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 $(Λ_QCD/m_Q)^2$ 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.

-Brian
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osu.edu/pipermail/physics-staff-df/attachments/20190916/b82cf1a4/attachment.html>