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- W2148089083 abstract "We point out that in the case of a heavy top quark T, present in the Littlest Higgs model (LH), and the t-T mixing parameter x_L > 0.90 the contribution to B^0_{d,s}-bar B^0_{d,s} mixing from box diagrams with two T exchanges cannot be neglected. Although formally O(v^4/f^4) with v = 246 GeV and f > 1 TeV, this contribution increases linearly with x_T = m_T^2/M^2_W and with x_T = O(f^2/v^2) constitutes effectively an O(v^2/f^2) correction. For x_L ~ 1, this contribution turns out to be more important than the genuine O(v^2/f^2) corrections. In particular it is larger than the recently calculated O(v^2/f^2) contribution of box diagrams with a single T exchange that increases only logarithmically with x_T. For x_L = 0.95 and f/v = 5,10,15, the short distance function S governing the B^0_{d,s}-bar B^0_{d,s} mixing mass differences Delta M_{d,s} receives 56%, 15% and 7% enhancements relative to its Standard Model (SM) value, implying a suppression of the CKM element V_td and an enhancement of Delta M_s. The short distance functions X and Y, relevant for rare K and B decays, increase only logarithmically with x_T. With the suppressed V_td, K->pinubarnu and B_d->mu^+mu^- decays are only insignificantly modified with respect to the SM, while the branching ratio Br(B_s->mu^+mu^-) receives 66%, 19% and 9% enhancements for x_L = 0.95 and f/v = 5,10,15, respectively. Similar enhancement is found for Br(B_s->mubarmu)/Br(B_d->mubarmu)." @default.
- W2148089083 created "2016-06-24" @default.
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- W2148089083 date "2005-01-25" @default.
- W2148089083 modified "2023-09-27" @default.
- W2148089083 title "Non-decoupling effects of the heavy T in the B0(d,s) - anti- B0(d,s) mixing and rare K and B decays" @default.
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