Flavor physics in the LHC era: The role of the lattice

John W Laiho, Enrico Lunghi, Ruth S. Van de Water

Research output: Contribution to journalConference article

2 Scopus citations

Abstract

We discuss the present status of global fits to the CKM unitary triangle using the latest experimental and theoretical constraints. For the required nonperturbative weak matrix elements, we use three-flavor lattice QCD averages from www.latticeaverages.org; these have been updated from Ref. [1] to reflect all available lattice calculations as of the “End of 2011.” Because of the greater than 3σ disagreement between the extraction of |Vub| from inclusive and exclusive semileptonic b → u`ν (` = e, µ) decays, particular emphasis is given to a clean fit in which we remove the information from these decays. Given current theoretical and experimental inputs, we observe an approximately 3σ tension in the CKM unitarity triangle that may indicate the presence of new physics in the quark-flavor sector. Using a model-independent parameterization of new-physics effects, we test the compatibility of the data with scenarios in which the new physics is in kaon mixing, in B-mixing, or in B → τν decay. We find that scenarios with new physics in B → τν decay or B-mixing are approximately equally preferred. If we interpret these results in terms of contributions to ∆S = 2 and ∆B = 2 four-fermion operators, we find that the preferred scale of new physics (with Standard-Model like couplings) is in the few hundred GeV range.

Original languageEnglish (US)
JournalProceedings of Science
Volume139
StatePublished - Jan 1 2011
Externally publishedYes
Event29th International Symposium on Lattice Field Theory, Lattice 2011 - Squaw Valley, Lake Tahoe, United States
Duration: Jul 10 2011Jul 16 2011

ASJC Scopus subject areas

  • General

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