Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Oliver Bär"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 8, Pp 1-22 (2023)
Abstract Multi-particle states with additional pions are expected to result in a difficult-to-control excited-state contamination in lattice simulations. We show that heavy meson chiral perturbation theory can be employed to estimate the contaminatio
Externí odkaz:
https://doaj.org/article/c7c253057c954118865e7baae99eaac5
Autor:
Haris Colic, Oliver Bär
Publikováno v:
Physical Review
The nucleon-pion-state contribution to QCD two-point and three-point functions relevant for lattice calculations of the nucleon electromagnetic form factors are studied in chiral perturbation theory. To leading order the results depend on a few exper
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::834b45109dacce146ca915992202f804
http://repo.scoap3.org/api
http://repo.scoap3.org/api
Autor:
Oliver Bär
Publikováno v:
Physical Review
The RQCD collaboration proposed a projection method to remove the excited state contamination in lattice OCD calculations of nuclear form factors. The effectiveness of this method in removing the two-particle nucleon-pion-state contamination is exami
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c8c5dd3199fd76066d73fc7435bf1339
https://doi.org/10.1103/physrevd.101.034515
https://doi.org/10.1103/physrevd.101.034515
Autor:
Oliver Bär
Publikováno v:
Physical Review
The nucleon-pion-state contribution in the QCD 3-point function of the pseudoscalar density is calculated to leading order in chiral perturbation theory. It predicts a nucleon-pion-state contamination in lattice estimates for the pseudoscalar form fa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cec7d4b22c06e58074a2e67e2a26c57e
https://doi.org/10.1103/physrevd.100.054507
https://doi.org/10.1103/physrevd.100.054507
Autor:
Oliver Bär
Publikováno v:
Physical Review
The nucleon-pion-state contribution to QCD two-point and three-point functions used in lattice calculations of the nucleon axial form factors are studied in chiral perturbation theory. For small quark masses this contribution is expected to be the do
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::445d7fa40c8a607ab0d250b670670fa8
https://doi.org/10.1103/physrevd.99.054506
https://doi.org/10.1103/physrevd.99.054506
Autor:
Oliver Bär
Publikováno v:
Physical Review
The three-particle $N\pi\pi$-state contribution to the QCD two-point function of standard nucleon interpolating fields is computed to leading order in chiral perturbation theory. Using the experimental values for two low-energy coefficients the impac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::84c319552caefb03f2b1626cbbd19666
https://doi.org/10.1103/physrevd.97.094507
https://doi.org/10.1103/physrevd.97.094507
Autor:
Oliver Bär
Publikováno v:
EPJ Web of Conferences, Vol 175, p 01007 (2018)
Multi-particle states with additional pions are expected to be a non-negligible source of the excited-state contamination in lattice simulations at the physical point. It is shown that baryon chiral perturbation theory (ChPT) can be employed to calcu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::afa36ba79a06c59c33f56cbb663deb23
http://arxiv.org/abs/1708.00380
http://arxiv.org/abs/1708.00380
Autor:
Oliver Bär
Publikováno v:
Physical Review D. 94
We employ leading order covariant chiral perturbation theory to compute the nucleon-pion-state contribution to the 3-point correlation functions one typically measures in lattice QCD to extract the isovector nucleon charges $g_A,g_T$ and $g_S$. We es
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9094c0daa2955523963df89ac8738976
https://doi.org/10.1103/physrevd.94.054505
https://doi.org/10.1103/physrevd.94.054505
Autor:
Oliver Bär
We employ chiral perturbation theory to calculate the nucleon-pion-state contribution to the 3-point correlation functions measured in lattice QCD to compute various moments of parton distribution functions (quark momentum fraction, helicity and tran
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a225e1a7fb21ba13b419df70bffb68ed
Autor:
Oliver Bär
We study the nucleon-pion-state contribution to the QCD two-point function of the standard nucleon interpolating fields. For sufficiently small quark masses these two-particle states are expected to have a smaller total energy than the single-particl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b537a48bd47731d44470f1bd4a3a7c6a