Adelaide Research & Scholarship
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https://hdl.handle.net/2440/76744
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| Type: | Journal article |
| Title: | Strong contribution to octet baryon mass splittings |
| Author: | Shanahan, P. Thomas, A. Young, R. |
| Citation: | Physics Letters B: Nuclear Physics and Particle Physics, 2013; 718(3):1148-1153 |
| Publisher: | Elsevier Science BV |
| Issue Date: | 2013 |
| ISSN: | 0370-2693 1873-2445 |
| Statement of Responsibility: | P.E. Shanahan, A.W. Thomas, R.D. Young |
| Abstract: | We calculate the md-mu contribution to the mass splittings in baryonic isospin multiplets using SU(3) chiral perturbation theory and lattice QCD. Fitting isospin-averaged perturbation theory functions to PACS-CS and QCDSF-UKQCD Collaboration lattice simulations of octet baryon masses, and using the physical light-quark mass ratio mu/md as input, allows Mn-Mp, Mσ--Mσ+ and MΞ--MΞ0 to be evaluated from the full SU(3) theory. The resulting values for each mass splitting are consistent with the experimental values after allowing for electromagnetic corrections. In the case of the nucleon, we find Mn-Mp=2.9±0.4 MeV, with the dominant uncertainty arising from the error in mu/md. © 2012 Elsevier B.V. |
| Keywords: | Isospin breaking Baryon mass splittings Charge symmetry breaking SU(3) chiral perturbation theory |
| Rights: | Copyright © 2012 Elsevier B.V. All rights reserved. |
| DOI: | 10.1016/j.physletb.2012.11.072 |
| Published version: | http://dx.doi.org/10.1016/j.physletb.2012.11.072 |
| Appears in Collections: | Aurora harvest 4 Special Research Centre for the Subatomic Structure of Matter publications |
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