Lattice QCD calculations with chiral fermions of the πN sigma term σπN and strangeness sigma term σsN including chiral interpolation with continuum and volume corrections are provided in this work, with the excited-state contaminations subtracted properly. We calculate the scalar matrix element for the light/strange quark directly and find σπN=45.9(7.4)(2.8) MeV, with the disconnected insertion part contributing 20(12)(4)%, and σsN=40.2(11.7)(3.5) MeV, which is somewhat smaller than σπN. The ratio of the strange/light scalar matrix elements is y=0.09(3)(1).
|Journal||Physical Review D|
|State||Published - Sep 8 2016|
Bibliographical noteFunding Information:
We thank the RBC and UKQCD collaborations for providing us their DWF gauge configurations. This work is supported in part by U.S. DOE Grant No.DE-SC0013065. A.A. is supported in part by National Science Foundation CAREER Grant No.PHY-1151648 and by U.S. DOE Grant No.DE-FG02-95ER40907. Y.Y. also thanks the Department of Energys Institute for Nuclear Theory at the University of Washington for its partial support and hospitality. This research used 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 under Contract No.DE-AC05-00OR22725.
© 2016 American Physical Society.
ASJC Scopus subject areas
- Nuclear and High Energy Physics