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pro vyhledávání: '"Bar, Oliver"'
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 contamination due to
Externí odkaz:
http://arxiv.org/abs/2306.02703
Multi-particle states with additional pions are expected to result in a non-negligible excited-state contamination in lattice simulations. We show that heavy meson chiral perturbation theory can be employed to calculate the contamination due to two-p
Externí odkaz:
http://arxiv.org/abs/2210.06857
Nucleon-pion-state contamination in lattice computations of the nucleon electromagnetic form factors
Autor:
Bar, Oliver, Colic, Haris
The nucleon-pion-state contributions 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 expe
Externí odkaz:
http://arxiv.org/abs/2109.14930
Autor:
Bar, Oliver, Colic, Haris
Publikováno v:
Phys. Rev. D 103, 114514 (2021)
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:
http://arxiv.org/abs/2104.00329
Autor:
Bar, Oliver
Publikováno v:
Phys. Rev. D 101, 034515 (2020)
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:
http://arxiv.org/abs/1912.05873
Autor:
Bar, Oliver
The $N\pi$-state contribution to nucleon 3-pt functions involving the pseudoscalar density $P(x)$ and the time component $A_4(x)$ of the axial vector current are computed to LO in ChPT. In case of the latter the $N\pi$ contribution is O($M_N$) enhanc
Externí odkaz:
http://arxiv.org/abs/1907.03284
Autor:
Bar, Oliver
Publikováno v:
Phys. Rev. D 100, 054507 (2019)
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:
http://arxiv.org/abs/1906.03652
Autor:
Bar, Oliver
Publikováno v:
Phys. Rev. D 99, 054506 (2019)
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:
http://arxiv.org/abs/1812.09191
Autor:
Bar, Oliver
The nucleon-pion-state contribution to QCD two- and three-point functions used in the calculation of the axial form factors of the nucleon are studied in chiral perturbation theory. For physically small quark masses the nucleon-pion states are expect
Externí odkaz:
http://arxiv.org/abs/1808.08738
Autor:
Bar, Oliver
Publikováno v:
Phys. Rev. D 97, 094507 (2018)
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:
http://arxiv.org/abs/1802.10442