Nucleon Charges from 2+1+1-flavor HISQ and 2+1-flavor clover lattices
Precise estimates of the nucleon charges gA, gS and gT are needed in many phenomenological analyses of SM and BSM physics. In this talk, we present results from two sets of calculations using clover fermions on 9 ensembles of 2+1+1-flavor HISQ and 4 ensembles of 2+1-flavor clover lattices. In addition, we show that high statistics can be obtained cost-effectively using the truncated solver method with bias correction and the coherent source sequential propagator technique. By performing simulations at 4–5 values of the source-sink separation tsep, we demonstrate control over excited-state contamination using 2- and 3-state fits. Using the high-precision 2+1+1-flavor data, we perform a simultaneous fit in a, Mπ and MπL to obtain our final results for the charges.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program
- Contributing Organization:
- PNDME and NME Collaborations
- Grant/Contract Number:
- AC52-06NA25396; AC05-00OR22725
- OSTI ID:
- 1356141
- Report Number(s):
- LA-UR-16-29008
- Journal Information:
- PoS Proceedings of Science, Vol. 157; Conference: 34. Annual international symposium on lattice field theory (LATTICE2016), Southampton (United Kingdom), 24-30 Jul 2016; ISSN 1824-8039
- Publisher:
- SISSACopyright Statement
- Country of Publication:
- United States
- Language:
- English
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