期刊
PHYSICAL REVIEW LETTERS
卷 119, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.062002
关键词
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资金
- National Science Foundation [NSF PHY11-25915]
- U.S. Department of Energy [DE-AC02-05CH11231, DE-SC001347, DE-SC00-10337, DE-FG02-00ER41132, DE-FG02-04ER41302, DE-AC05-06OR23177]
- Office of Science of the U.S. Department of Energy [AC05-00OR22725]
- National Science Foundation Continuing [PHY1206498]
- USQCD SciDAC project
- U.S. Department of Energy Early Career Research Award [DE-SC0010495, DE-SC0011090]
- Department of Energy (DOE) [DE-FG02-00ER41132]
- joint City College of New York-RIKEN Brookhaven Research Center fellowship
- U.S. National Science Foundation [PHY15-15738]
- DOE [DE-FG02-00ER41132]
- USQCD Scientific Discovery through the Advanced Computing (SciDAC) project - U.S. Department of Energy, Office of Science, Offices of Advanced Scientific Computing Research, Nuclear Physics and High Energy Physics
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC05-06OR23177]
- U.S. Department of Energy (DOE) [DE-FG02-00ER41132] Funding Source: U.S. Department of Energy (DOE)
The nuclear matrix element determining the pp -> de(+)v fusion cross section and the Gamow-Teller matrix element contributing to tritium beta decay are calculated with lattice quantum chromodynamics for the first time. Using a new implementation of the background field method, these quantities are calculated at the SU(3) flavor-symmetric value of the quark masses, corresponding to a pion mass of m(pi) similar to 806 MeV. The Gamow-Teller matrix element in tritium is found to be 0.979(03)(10) at these quark masses, which is within 2 sigma of the experimental value. Assuming that the short-distance correlated two-nucleon contributions to the matrix element (meson-exchange currents) depend only mildly on the quark masses, as seen for the analogous magnetic interactions, the calculated pp -> de(+)v transition matrix element leads to a fusion cross section at the physical quark masses that is consistent with its currently accepted value. Moreover, the leading two-nucleon axial counterterm of pionless effective field theory is determined to be L-1,L-A = 3.9(0.2)(1.0)(0.4)(0.9) fm(3) at a renormalization scale set by the physical pion mass, also agreeing within the accepted phenomenological range. This work concretely demonstrates that weak transition amplitudes in few-nucleon systems can be studied directly from the fundamental quark and gluon degrees of freedom and opens the way for subsequent investigations of many important quantities in nuclear physics.
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