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12 papers found.
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An operator basis for the Standard Model with an added scalar singlet

Motivated by the possible di-gamma resonance at 750 GeV, we present a basis of effective operators for the Standard Model plus a scalar singlet at dimensions 5, 6, and 7. We point out that an earlier list at dimensions 5 and 6 contains two redundant operators at dimension 5.

On the structure of anomalous composite Higgs models

We describe the anomaly structure of a composite Higgs model in which the SO(5) / SO(4) coset structure of the minimal model is extended by an additional, non-linearly realised \(U(1)_{\eta }\). In addition, we show that the effective Lagrangian admits a term that, like the Wess–Zumino–Witten term in the chiral Lagrangian for QCD, is not invariant under the non-linearly realised...

Linear flavour violation and anomalies in B physics

We propose renormalizable models of new physics that can explain various anomalies observed in decays of B-mesons to electron and muon pairs. The new physics states couple to linear combinations of Standard Model fermions, yielding a pattern of flavour violation that gives a consistent fit to the gamut of flavour data. Accidental symmetries prevent contributions to baryon- and...

Composite leptoquarks and anomalies in B-meson decays

We attempt to explain recent anomalies in semileptonic B decays at LHCb via a composite Higgs model, in which both the Higgs and an SU(2) L -triplet leptoquark arise as pseudo-Goldstone bosons of the strong dynamics. Fermion masses are assumed to be generated via the mechanism of partial compositeness, which largely determines the leptoquark couplings and implies non-universal...

Search strategies for top partners in composite Higgs models

Ben Gripaios Thibaut Muller M.A. Parker Dave Sutherland Cavendish Laboratory J.J. Thomson Avenue Cambridge U.K. E-mail: dws @cam.ac.uk We consider how best to search for top partners in generic

Composite leptoquarks at the LHC

Ben Gripaios 0 0 CERN PH-TH, Geneva 23, 1211 Switzerland If electroweak symmetry breaking arises via strongly-coupled physics, the observed suppression of flavour-changing processes suggests that

Partially supersymmetric composite Higgs models

Michele Redi 0 Ben Gripaios 0 0 CERN, PH-TH, CH-1211, Geneva 23, Switzerland We study the idea of the Higgs as a pseudo-Goldstone boson within the framework of partial supersymmetry in Randall

Reconstruction of Higgs bosons in the di-tau channel via 3-prong decay

We propose a method for reconstructing the mass of a particle, such as the Higgs boson, decaying into a pair of τ leptons, of which one subsequently undergoes a 3-prong decay. The kinematics is solved using information from the visible decay products, the missing transverse momentum, and the 3-prong τ decay vertex, with the detector resolution taken into account using a...

Polynomials, Riemann surfaces, and reconstructing missing-energy events

We consider the problem of reconstructing energies, momenta, and masses in collider events with missing energy, along with the complications introduced by combinatorial ambiguities and measurement errors. Typically, one reconstructs more than one value and we show how the wrong values may be correlated with the right ones. The problem has a natural formulation in terms of the...

Flavourful production at hadron colliders

We ask what new states may lie at or below the TeV scale, with sizable flavour-dependent couplings to light quarks, putting them within reach of hadron colliders via resonant production, or in association with Standard Model states. In particular, we focus on the compatibility of such states with stringent flavour-changing neutral current and electric-dipole moment constraints...

Searching for third-generation composite leptoquarks at the LHC

Fermion masses may arise via mixing of elementary fermions with composite fermions of a strong sector in scenarios of strongly-coupled electroweak symmetry breaking. The strong sector may contain leptoquark states with masses as light as several hundred GeV. In the present study we focus on the scalar modes of such leptoquarks since their bosonic couplings are determined...