Extracting the low-energy constant L_(0)^(r)at three flavors from pion-kaon scattering  

作　　者：Chaitra Kalmahalli Guruswamy Ulf-G Meißner Chien-Yeah Seng 

机构地区：[1]Helmholtz-Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics,Universität Bonn,D-53115 Bonn,Germany [2]Institute for Advanced Simulation,Institut für Kernphysik and Jülich Center for Hadron Physics,Forschungszentrum Jülich,D-52425 Jülich,Germany [3]Tbilisi State University,0186 Tbilisi,Georgia

出　　处：《Communications in Theoretical Physics》2022年第6期61-65,共5页理论物理通讯（英文版）

基　　金：supported in part by the DFG(Projektnummer 196253076—TRR 110);the NSFC(Grant No.11621131001)through the funds provided to the Sino-German CRC 110‘Symmetries and the Emergence of Structure in QCD’;by the Alexander von Humboldt Foundation through the Humboldt Research Fellowship;by the Chinese Academy of Sciences(CAS)through a President’s International Fellowship Initiative(PIFI)(Grant No.2018DM0034);by the Volkswagen Stiftung(Grant No.93562);by the EU Horizon 2020 research and innovation programme,STRONG-2020 project under grant agreement No.824093。

摘　　要：based on our analysis of the contributions from the connected and disconnected contraction diagrams to the pion-kaon scattering amplitude,we provide the first determination of the only free low-energy constant at O(p^(4)),known as L_(0)^(r),in SU(4|1)Partially-Quenched Chiral Perturbation theory using the data from the Extended Twisted Mass collaboration,L_(0)^(r)(μ=M_(ρ))=0.77(20)(25)(7)(7)(2)·10^(-3).The theory uncertainties originate from the unphysical scattering length,the physical low-energy constants,the higher-order chiral corrections,the(lattice)meson masses and the pion decay constant,respectively.

关 键 词：lattice QCD partially quenched chiral perturbation theory pion-kaon scattering 

分 类 号：O572.33[理学—粒子物理与原子核物理]