Top-quark physics: Status and prospects

Abstract

After the discovery of the top quark more than 20 years ago, its properties have been studied in great detail both in production and in decay. Increasingly sophisticated experimental results from the Fermilab Tevatron and from Run 1 and Run 2 of the LHC at CERN are complemented by very precise theoretical predictions in the framework of the standard model of particle physics and beyond. In this article the current status of top-quark physics is reviewed, focusing on experimental results, and a perspective of top-quark physics at the LHC and at future colliders is given.

Symbolic expressions for fully differential single top quark production cross section and decay width of polarized top quark in the presence of anomalous Wtb couplings

“…3) using the CompHEP program [39] and show the same multidimensional distributions in the top rest frame taking all the angles with respect to the d-quark momentum ( Fig. 4) and restore angle φ using an expression (6). Note that the anomalous couplings are included both in the top quark production and decay process.…”

NNLO soft function for top quark pair production at small transverse momentum

“…where the colour structure is encoded in the w (1) ij matrices defined as where µ 2 e γ E 4π comes from renormalization of the strong coupling, see Eq. (2.68), and the remaining prefactors arise from the Fourier transform and azimuthal averaging.…”

“…where [48] g (1) ij ( , p, p i , p j ) = − 1 2 α s 2π 4π e γ E 2(p i · p j )µ 2 2(p i · p)2(p j · p) ij , were derived in Refs. [47,48], and they depend solely on the rescaling-invariant variables…”

“…One of the most important classes of measurements studied at the Large Hadron Collider (LHC) concern processes which involve the production of the top quark. Of particular interest is topanti-top production, which is relevant both in studies of properties of the Standard Model, as well as in searches for new physics, as it forms significant backgrounds to many signatures [1].…”

The effect of the anomalous Wtb interactions on spin correlations in t-channel single top quark production with subsequent decay

“…However, most likely, the SM is a kind of effective field theory working (and working amazingly well) at the energy range determined by the electroweak (EW) energy scale. The top quark being the heaviest found fundamental particle with closest to the EW scale mass is a promising place to search for possible deviations from the SM (see, recent reviews on top quark [1][2][3][4][5]. In particular such deviations may be related to a presence of the top quark anomalous couplings which are usually parametrizes in terms of a number of the gauge invariant dimension 6 operators [6][7][8][9][10] …”