Single-particle and collective motions from nuclear many-body correlation (PCM2025)

Charge symmetry breaking effects with ω-ρ0 mixing

5 Mar 2025, 15:22

1m

Main Lecture Hall (University of Aizu)

Poster session

Speaker

Yusuke Tanimura (Soongsil University)

Description

One of the primary goals of nuclear physics is to achieve a unified understanding of baryon-baryon interactions based on flavor symmetry and its breaking. Charge symmetry breaking (CSB) represents a part of the flavor symmetry that is violated by nuclear forces, leading to differences in neutron-neutron and proton-proton interactions, as well as in neutron-Lambda and proton-Lambda interactions. The CSB effects are indeed observed in the mirror binding energy differences of both normal nuclei and hypernuclei [1-3].

In this work, we introduce CSB through $\omega$-${\rho }^0$ mixing [4] within a relativistic mean-field model, along with corrections for electromagnetic (EM) interactions (such as the EM form factors of nucleons and vacuum polarization). An advantage of our model is its applicability to hypernuclei on an equal footing with normal nuclei. In this talk, we focus on normal nuclei and examine the effects of $\omega$-${\rho }^0$ mixing on observables such as binding energy and charge radius. We also compare the CSB strength in our model with that of Skyrme-type CSB models.

[1] Nolen and Schiffer, Ann. Rev. Nucl. Sci. 19, 471 (1969).
[2] Botta, AIP Conf. Proc. 2130, 030003 (2019).
[3] Brown, Phys. Lett. B483, 49 (2000).
[4] Coleman and Glashow, Phys. Rev. Lett. 6, 423 (1961).