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Title: Short-distance matrix elements for D 0 -meson mixing from N f = 2 + 1 lattice QCD

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 N f=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 M π≈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 $$\overline{MS}$$-NDR scheme using the choice of evanescent operators proposed by Beneke et al., evaluated at 3 GeV, $$\langle$$D 0|O i|$$\bar{D}$$ 0 $$\rangle$$={0.0805(55)(16),-0.1561(70)(31),0.0464(31)(9),0.2747(129)(55),0.1035(71)(21)} GeV 4 (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 D 0 mixing, finding lower limits of about 10–50×10 3 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.
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Publication Date:
Report Number(s):
FERMILAB-PUB-17-196-T; arXiv:1706.04622
Journal ID: ISSN 2470-0010; PRVDAQ; 1605395; TRN: US1801814
Grant/Contract Number:
AC02-07CH11359; FG02-91ER40628; FC02-06ER41446; PHY13-16748; PHY14-17805; FG02-13ER41976; FG02-13ER42001; FG02-91ER40661; SC0010120; SC0010005; SC0012704; PCIG10-GA-2011-303781; PHY10-67881; PHY14-14614; PHY16-20625; SC0015655
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 3; Journal ID: ISSN 2470-0010
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); European Union (EU); National Science Foundation (NSF)
Contributing Orgs:
Fermilab Lattice and MILC Collaborations
Country of Publication:
United States
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1423574