Zobrazeno 1 - 10
of 87
pro vyhledávání: '"Ledwig T."'
Publikováno v:
EPJ Web of Conferences, Vol 73, p 04015 (2014)
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(1
Externí odkaz:
https://doaj.org/article/ee014370a4e2445393d542dde353d8ea
The nucleon mass and pion-nucleon sigma term from a chiral analysis of Nf = 2 lattice QCD world data
Publikováno v:
EPJ Web of Conferences, Vol 66, p 06001 (2014)
We investigate the pion-mass dependence of the nucleon mass within the covariant SU(2) baryon chiral perturbation theory up to order p4 with and without explicit Δ (1232) degrees of freedom. We fit lattice QCD data from several collaborations for 2
Externí odkaz:
https://doaj.org/article/152348a526e243e6864956fab207c4ef
Treating the strange quark mass as a heavy scale compared to the light quark mass, we perform a matching of the nucleon mass in the SU(3) sector to the two-flavor case in covariant baryon chiral perturbation theory. The validity of the $19$ low-energ
Externí odkaz:
http://arxiv.org/abs/1606.03820
Publikováno v:
Phys. Rev. D 93, 094018 (2016)
We calculate the neutral pion photoproduction on the proton near threshold in covariant baryon chiral perturbation theory, including the $\Delta(1232)$ resonance as an explicit degree of freedom, up to chiral order $p^{7/2}$ in the $\delta$ counting.
Externí odkaz:
http://arxiv.org/abs/1602.08967
We investigate the neutral pion photoproduction on the proton near threshold in covariant chiral perturbation theory with the explicit inclusion of Delta degrees of freedom. This channel is specially sensitive to chiral dynamics and the advent of ver
Externí odkaz:
http://arxiv.org/abs/1412.4083
Publikováno v:
Phys. Rev. D 90, 114020 (2014)
The analysis of hadronic interactions with effective field theory techniques is complicated by the appearance of a large number of low-energy constants, which are usually fitted to data. On the other hand, the large-$N_c$ limit imposes natural short-
Externí odkaz:
http://arxiv.org/abs/1407.3750
Publikováno v:
Phys. Rev. D 90, 054502 (2014)
The octet-baryon axial-vector charges and the g1/f1 ratios measured in the semileptonic hyperon decays are studied up to O(p^3) using the covariant baryon chiral perturbation theory with explicit decuplet contributions. We clarify the role of differe
Externí odkaz:
http://arxiv.org/abs/1405.5456
We investigate the pion-mass dependence of the nucleon mass within the covariant SU(2) baryon chiral perturbation theory up to order p4 with and without explicit Delta(1232) degrees of freedom. We fit lattice QCD data from several collaborations for
Externí odkaz:
http://arxiv.org/abs/1402.1031
The pion-mass dependence of the nucleon mass within the covariant SU(2) baryon chiral perturbation theory both without and with explicit Delta(1232) degrees of freedom up to order p^4 is investigated. By fitting to lattice QCD data in 2 and 2+1 flavo
Externí odkaz:
http://arxiv.org/abs/1304.0483
An expansion of the electromagnetic form factors of the nucleon and Delta(1232) in small momentum transfer and pion mass is performed in a manifestly-covariant EFT framework consistent with chiral symmetry and analyticity. We present the expressions
Externí odkaz:
http://arxiv.org/abs/1108.2523