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Acharya, NR; Guo, FK; Meissner, UG; Seng, CY
Constraints on disconnected contributions in pi pi scattering
AbstractThe accuracy of the lattice QCD computation of hadron-hadron scattering at low isospin depends critically on the ability to compute correlation functions with fermionic disconnected Wick contractions. This happens, for instance, in isospin I = 0 pi pi scattering, which receives contributions from rectangular and vacuum types of contractions among other easier calculable ones. Combining Luscher's formula and partially-quenched chiral perturbation theory, we provide precise theory predictions of the discrete energy levels extracted from specific linear combinations of lattice correlation functions corresponding to various types of contractions. Expressions are provided for extracting the unphysical low-energy constants in the partially-quenched chiral perturbation theory from the energy levels for these contractions. The predictions for the rectangular and vacuum contractions may serve as solid tests of the accuracy for existing and future lattice studies of pi pi scattering.
Subject AreaPhysics
MOST Discipline CataloguePhysics, Particles & Fields
Indexed BySCIE
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.[Acharya, N. Ripunjay
2.Meissner, Ulf-G.
3.Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany
4.Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany
5.Chinese Acad Sci, CAS Key Lab Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China
6.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
7.[Meissner, Ulf-G.] Forschungszentrum Julich, Inst Adv Simulat, Inst Kernphys, D-52425 Julich, Germany
8.[Meissner, Ulf-G.] Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany
9.[Meissner, Ulf-G.] Tbilisi State Univ, Tbilisi 0186, Rep of Georgia
Recommended Citation
GB/T 7714
Acharya, NR,Guo, FK,Meissner, UG,et al. Constraints on disconnected contributions in pi pi scattering[J]. JOURNAL OF HIGH ENERGY PHYSICS,2019(4):165.
APA Acharya, NR,Guo, FK,Meissner, UG,&Seng, CY.(2019).Constraints on disconnected contributions in pi pi scattering.JOURNAL OF HIGH ENERGY PHYSICS(4),165.
MLA Acharya, NR,et al."Constraints on disconnected contributions in pi pi scattering".JOURNAL OF HIGH ENERGY PHYSICS .4(2019):165.
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