Universal Unitarity Triangle 2016 and the tension between ΔMs,d and εK in CMFV models
Blanke, Monika; Buras, Andrzej J.
Abstract (englisch):
Motivated by the recently improved results from the Fermilab Lattice and MILC Collaborations on the hadronic matrix elements entering (Formula presented.) in (Formula presented.) – (Formula presented.) mixing, we determine the universal unitarity triangle (UUT) in models with constrained minimal flavour violation (CMFV). Of particular importance are the very precise determinations of the ratio (Formula presented.) and of the angle (Formula presented.). They follow in this framework from the experimental values of (Formula presented.) and of the CPasymmetry (Formula presented.). As in CMFV models the new contributions to meson mixings can be described by a single flavouruniversal variable S(v), we next determine the CKM matrix elements (Formula presented.) , (Formula presented.) , (Formula presented.) and (Formula presented.) as functions of S(v) using the experimental value of (Formula presented.) as input. The lower bound on S(v) in these models, derived by us in 2006, implies then upper bounds on these four CKM elements and on the CPviolating parameter (Formula presented.) , which turns out to be significantly below its experimental value. This strategy avoids the use of treelevel determinations of (Formula presented.) and (Formula presented.) , which are presently subject to considerable uncertainties. On the other hand, if (Formula presented.) is used instead of (Formula presented.) as input, (Formula presented.) are found to be significantly above the data. In this manner we point out that the new lattice data have significantly sharpened the tension between (Formula presented.) and (Formula presented.) within the CMFV framework. This implies the presence of new physics contributions beyond this framework that are responsible for the breakdown of the flavour universality of the function S(v). We also present the implications of these results for (Formula presented.) , (Formula presented.) and (Formula presented.) within the Standard Model. © 2016, The Author(s).
Zugehörige Institution(en) am KIT 
Institut für Kernphysik (IKP) Institut für Theoretische Teilchenphysik (TTP)

Publikationstyp 
Zeitschriftenaufsatz 
Jahr 
2016 
Sprache 
Englisch 
Identifikator 
DOI: 10.1140/epjc/s1005201640446
ISSN: 14346044, 14346052
URN: urn:nbn:de:swb:90549010
KITopen ID: 1000054901 
HGFProgramm 
51.01.01; LK 01 
Erschienen in 
The European physical journal / C 
Band 
76 
Heft 
4 
Seiten 
Article no. 197 
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