High Energy Physics Seminar next week - Rong

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_*
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*Tuesday, 20 October *2026, at *16:00* - *L. Stasi* Seminar Room 
-*https://indico.ictp.it/event/11506/*


Junchen Rong (École Polytechnique, Paris)


*“Probing the QCD Conformal Window with Four-Quark Operators"*
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_*Abstract*_

Consider QCD with gauge group SU(Nc) and Nf massless quark flavors. In 
the Veneziano limit (Nc and Nf tend to infinity with Nf/Nc fixed),  
Nf/Nc becomes a continuous parameter. For small ε = 11/2 − Nf/Nc, the 
theory flows to the weakly coupled Caswell-Banks–Zaks infrared fixed 
point. One proposed mechanism for the loss of conformality at larger ε 
is a merger with another fixed point, after which the two move into the 
complex plane. This mechanism has also been conjectured to mark the 
onset of chiral symmetry breaking. We calculate the scaling dimensions 
of four-quark operators in the Veneziano limit up to fourth order in ε, 
using their approach to marginality to test the fixed-point merger 
scenario. I will discuss results from several resummation techniques and 
their implications for the lower edge of the QCD conformal window.

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*To attend via Zoom kindly register here:*
https://zoom.us/meeting/register/eYe6RwPyRAKTZq4WvBTr8A