# Nuclear Physics & RIKEN Theory Seminar

## "Quantum anomalous energy and proton mass decomposition"

#### Presented by Dr Yizhuang Liu, Regensburg

Friday, March 5, 2021, 9:15 am — Videoconference / Virtual Event (see link below)

Abstract: I will discuss issues related to the proton mass decomposition and in particular, the role played by the anomalous term.

I will first show that the form of the mass decomposition crucially depends on the regularization scheme, or more precisely , depends on whether there is a cutoff in temporal direction.

I will show that in symmetric cutoff theory, the existence of an anomalous term is manifest and can be traced back to the construction of isotropic cutoff theory.

Then I will use 1+1 non-linear sigma model in large N limit as an example to demonstrate the above points by studying the mass structure in various cutoff schemes.

I will argue that the mass generation through trace anomaly can be viewed as dynamical higgs effect.

Finally, I will comment on the possibility of probing the gluon content of nucleon through photo production of Ji/Psi.

Hosted by: Yoshitaka Hatta

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