We propose a strategy to access the qq component of the resonance in lattice QCD. Through a mixed action formalism (overlap valence on domain wall sea), the energy of the qq component is derived at dierent valence quark masses, and shows a linear dependence on m2π. The slope is determined to be c1=0:505(3)GeV-1, from which the valence πρ sigma term is extracted to be δ(val) πρ = 9:82(6) MeV using the Feynman-Hellman theorem. At the physical pion mass, the mass of the qq component is interpolated to be mρ=775:9±6:0±1:8 MeV, which is close to the ρ resonance mass. We also obtain the leptonic decay constant of the qq component to be fρ- =208:5±5:5±0:9 MeV, which can be compared with the experimental value f exp ρ ≈221 MeV through the relation fexp ρ = p Zρfρ ±, with Zρ≈1:13 being the on-shell wavefunction renormalization ofρ owing to the ρ-π interaction. We emphasize that mρ and fρ of the qq component, which are obtained for the first time from QCD, can be taken as the input parameters of ρ in eective field theory studies where ρ acts as a fundamental degree of freedom.
|Journal||Chinese Physics C|
|State||Published - May 2018|
Bibliographical noteFunding Information:
Received 8 March 2018, Published online 27 April 2018 ∗ Supported in part by the U.S. DOE Grant No. DE-SC0013065, the National Nature Science Foundation of China (NSFC) (11335001, 11575196, 11575197, 11621131001) (CRC110 by DFG and NSFC), A. A. is supported in part by the National Science Foundation CAREER (PHY-1151648) and by U.S. DOE (DE-FG02-95ER40907), Y. C. thanks the CAS Center for Excellence in Particle Physics (CCEPP) for their support, this research used the resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy (DE-AC05-00OR22725) 1) E-mail: email@example.com Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd
© 2018 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
- leptonic decay constant
- ρ resonance
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Astronomy and Astrophysics