| Autor: |
Alvarez-Ruso L., Ledwig T., Camalich J. Martin, Vacas M.J. Vicente |
| Jazyk: |
angličtina |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
EPJ Web of Conferences, Vol 73, p 04015 (2014) |
| Druh dokumentu: |
article |
| ISSN: |
2100-014X |
| DOI: |
10.1051/epjconf/20147304015 |
| Popis: |
The chiral behavior of the nucleon mass is studied within the covariant SU(2) baryon chiral perturbation theory up to order p4. Lattice QCD data for the ensembles of 2 and 2 + 1 flavors are separately fitted, paying special attention to explicit Δ(1232) degrees of freedom, finite volume corrections and finite spacing effects. In the case of the 2 flavor ensemble, we fit simultaneously nucleon mass data together with new and updated data for the σπN term both in their dimensionless forms and determine a Sommer-scale of r0 = 0.493(23) fm. We obtain low-energy constants of natural size that are compatible with the rather linear pion-mass dependence observed in lattice QCD and report a preliminary updated value of σπN = 43(5)(4) MeV for the 2 flavor case and σπN = 52(3)(8) MeV for 2 + 1 flavor case. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
