arXiv subjects

Alexander M. Segner

Publications and source records attributed to Alexander M. Segner.

3 recordsLinked to original sources

arXiv2023

Precision Determination of Baryon Masses including Isospin-breaking

We give an update on an ongoing project in which we calculate the masses of octet and decuplet baryons including isospin-breaking effects. To this end, we employ single- and two-state-fits to effective masses up to leading order in the expansion in isospin-breaking parameters. In order to remove subjective bias on asymptotic masses we furthermore compute an AIC-based model-average of our fits, for which we show results on ensembles at lattice spacings of 0.064 fm and 0.076 fm with corresponding pion masses ranging from 220 MeV to 360 MeV.

hep-lat↗

arXiv2022

Setting the Scale Using Baryon Masses with Isospin-Breaking Corrections

We present the status of an ongoing project aimed at the inclusion of isospin-breaking corrections arising from the non-degeneracy of the light quark masses and electromagnetic interactions in calculations of the low-lying octet and decuplet baryon masses. Our ultimate goal is to perform a precision determination of the lattice scale including isospin-breaking effects. We apply the perturbative formalism to isospin-symmetric $N_f=2+1$ CLS ensembles. We show results on baryon masses up to leading order in isospin-breaking corrections on two ensembles with $m_\pi\approx290\,\text{MeV}$ and $m_\pi\approx215\,\text{MeV}$ at a lattice spacing of $a\approx0.076\,\text{fm}$.

hep-lat↗

arXiv2021

Isospin-breaking Effects in Octet and Decuplet Baryon Masses

We present work designed to compute baryon masses on $N_f = 2 + 1$ CLS ensembles including isospin-breaking effects due to non-degenerate light quark masses and electromagnetic interactions. These effects are determined at leading order via a perturbative expansion around the iso-symmetric theory. We furthermore apply a group-theoretical operator construction for the various interpolators describing the different members of the baryon octet and decuplet based on a classification by spin, parity, and flavor content.

hep-lat↗