Decuplet baryons in nuclear and hyperonic medium
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Decuplet baryons in nuclear and hyperonic medium Harpreet Singha , Arvind Kumarb , Harleen Dahiyac Department of Physics, Dr. B R Ambedkar National Institute of Technology Jalandhar, Jalandhar, Punjab 144011, India Received: 23 August 2019 / Accepted: 11 April 2020 © Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Masses and the magnetic moments of baryon decuplet are evaluated in the symmetric nuclear and hyperonic matter at finite temperature using a chiral SU(3) quark mean field model approach. The decuplet baryon masses considerably decrease with the rise in the baryonic density of the medium. With the increase in strangeness (more number of hyperons as compared to nucleons) fraction, the non-strange baryons show an increase in their masses, whereas the strange baryons show a decrease. The contributions coming from the valence quarks, quark sea and the orbital angular momentum of the quark sea have been considered to calculate net magnetic moment. The magnetic moments of decuplet baryons are found to show a considerable increase with the baryonic density of the medium since constituent quark magnetic moment and the quark spin polarizations show significant variation in the nuclear medium especially in the low temperature and baryonic density regime. The increase is however quantitatively less as compared to the case of octet baryon members. With the inclusion of hyperons along with nucleons, the non-strange baryons show a decrease in the magnitude of their effective magnetic moments, whereas the strange baryons show an increase. The strangeness fraction of the medium is found to largely affect the valence quark magnetic moment and quark sea magnetic moment of the baryons. 1 Introduction The study of fundamental baryonic properties has been a significant topic in particle physics for decades. The static properties of baryons such as magnetic moments, charge radii and form factors have central importance for the study of the internal structure of baryons. The magnetic moment is one of the important structural properties which gives better insight into baryon structure and can provide valuable understanding of the mechanism of strong interaction at low energies, i.e., in the non-perturbative regime of QCD (Quantum Chromo Dynamics) [1]. Since Coleman and Glashow [2,3] predicted the magnetic moments of baryon octet, a lot of progress has been observed in both the theoretical paradigm and experimental verification for the study of baryon magnetic moments [4]. The magnetic moments of octet baryons in free space have been widely studied in different theoretical frameworks [5–11]. On the experimental side, seven of octet baryon magnetic moments are measured with about 1%
a e-mail: [email protected] b e-mails: [email protected]; [email protected] (corresponding author) c e-mail: [email protected]
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accuracy, whereas the transition magnetic moment for 0 → is known within 5
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