Full analysis of general non-standard tbW couplings

Full analysis of general non - standard tbW couplings

Possible non-standard couplings which could contribute to the t → bW process are studied based on the effective-Lagrangian approach. The corresponding effective Lagrangian consists of four kinds of dimension-6 effective operators, each of which has an independent coupling constant. In this analysis, all those couplings are treated as complex numbers and constraints on them are estimated by usin...

→ tt̄H with Non - standard Higgs Boson Couplings

Analysis of tbW and ttZ couplings from CLEO and LEP/SLC data

We update the constraints on anomalous dimension four t-b-W and t-t-Z couplings by using CLEO b → sγ and LEP/SLC precision Z-pole data. It is found that the data imposes very stringent bounds on them. Moreover, the 2σ pull from SM predictions of ALR(hadrons), Ab and AFB(b) have little chance of being explained by the strongly constrained anomalous couplings. PACS numbers: 14.65.Ha, 12.39.Fe, 12...

Full algebra of generalized functions and non-standard asymptotic analysis

We construct an algebra of generalized functions endowed with a canoni­ cal embedding of the space of Schwartz distributions. We offer a solution to the problem of multiplication of Schwartz distributions similar to but different from Colombeau’s solution. We show that the set of scalars of our algebra is an algebraically closed field unlike its counterpart in Colombeau theory, which is a ring ...

Tests of non-standard electroweak couplings of right-handed quarks

The standard model can be interpreted as the leading order of a Low-Energy Effective Theory (LEET) invariant under a higher non linearly realized symmetry Snat ⊃ SU(2)W × U(1)Y equipped with a systematic power counting. Within the minimal version of this “not quite decoupling” LEET, the dominant non-standard effect appears at next-to-leading order (NLO) and is a modification of the couplings of...