Short-distance matrix elements for D0-meson mixing from Nf=2+1 lattice QCD

作     者：A. Bazavov C. Bernard C. M. Bouchard C. C. Chang C. DeTar D. Du A. X. El-Khadra E. D. Freeland E. Gámiz Steven Gottlieb U. M. Heller A. S. Kronfeld J. Laiho P. B. Mackenzie E. T. Neil J. N. Simone R. Sugar D. Toussaint R. S. Van de Water R. Zhou 

作者机构：Department of Computational Mathematics Science and Engineering Department of Physics and Astronomy Michigan State University East Lansing Michigan 48824 USA Department of Physics Washington University St. Louis Missouri 63130 USA School of Physics and Astronomy University of Glasgow Glasgow G12 8QQ United Kingdom Department of Physics University of Illinois Urbana Illinois 61801 USA Fermi National Accelerator Laboratory Batavia Illinois 60510 USA Department of Physics and Astronomy University of Utah Salt Lake City Utah 84112 USA Department of Physics Syracuse University Syracuse New York 13244 USA Liberal Arts Department School of the Art Institute of Chicago Chicago Illinois 60603 USA CAFPE and Departamento de Física Teórica y del Cosmos Universidad de Granada 18071 Granada Spain Department of Physics Indiana University Bloomington Indiana 47405 USA American Physical Society Ridge New York 11961 USA Institute for Advanced Study Technische Universität München 85748 Garching Germany Department of Physics University of Colorado Boulder Colorado 80309 USA RIKEN-BNL Research Center Brookhaven National Laboratory Upton New York 11973 USA Department of Physics University of California Santa Barbara California 93016 USA Department of Physics University of Arizona Tucson Arizona 85721 USA 

出 版 物：《Physical Review D》 (Phy. Rev. D)

年 卷 期：2018年第97卷第3期

页      面：034513-034513页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：Fermi Research Alliance, LLC, (DE-AC02-07CH11359) German Excellence Initiative National Institute for Computational Science Texas Advanced Computing Center URA National Science Foundation, NSF, (1414614, DE-FC02-06ER41446, DE-FG02-13ER41976, DE-FG02-13ER42001, DE-FG02-91ER40628, DE-FG02-91ER40661, DE-SC0010005, DE-SC0010120, DE-SC0015655, PHY10-67881, PHY13-16748, PHY14-14614, PHY14-17805, PHY16-20625) National Science Foundation, NSF U.S. Department of Energy, USDOE, (DE-SC0012704) U.S. Department of Energy, USDOE Office of Science, SC High Energy Physics, HEP Seventh Framework Programme, FP7, (291763) Seventh Framework Programme, FP7 National Energy Research Scientific Computing Center, NERSC European Commission, EC, (PCIG10-GA-2011-303781) European Commission, EC Ministerio de Economía y Competitividad, MINECO, (FPA2013-47836-C-1-P) Ministerio de Economía y Competitividad, MINECO Seventh Framework Programme, FP7 Junta de Andalucía, (FQM-101, FQM-6552) Junta de Andalucía 

主　　题：Flavor changing neutral currents Form factors Charmed mesons Lattice QCD 

摘      要：We calculate in three-flavor lattice QCD the short-distance hadronic matrix elements of all five ΔC=2 four-fermion operators that contribute to neutral D-meson mixing both in and beyond the Standard Model. We use the MILC Collaboration’s Nf=2+1 lattice gauge-field configurations generated with asqtad-improved staggered sea quarks. We also employ the asqtad action for the valence light quarks and use the clover action with the Fermilab interpretation for the charm quark. We analyze a large set of ensembles with pions as light as Mπ≈180 MeV and lattice spacings as fine as a≈0.045 fm, thereby enabling good control over the extrapolation to the physical pion mass and continuum limit. We obtain for the matrix elements in the MS¯−NDR scheme using the choice of evanescent operators proposed by Beneke et al., evaluated at 3 GeV, ⟨D0|Oi|D¯0⟩={0.0805(55)(16),−0.1561(70)(31),0.0464(31)(9),0.2747(129)(55),0.1035(71)(21)} GeV4 (i=1–5). The errors shown are from statistics and lattice systematics, and the omission of charmed sea quarks, respectively. To illustrate the utility of our matrix-element results, we place bounds on the scale of CP-violating new physics in D0 mixing, finding lower limits of about 10–50×103 TeV for couplings of O(1). To enable our results to be employed in more sophisticated or model-specific phenomenological studies, we provide the correlations among our matrix-element results. For convenience, we also present numerical results in the other commonly used scheme of Buras, Misiak, and Urban.