PARTICLEFACE 2019

Session

Session 2

2

26 Feb 2019, 11:30

Room E10B (Department of Physics (University of Coimbra))

46. Uncovering new physics with precision

Heidi Angelika Rzehak (Syddansk Universitet (DK))

26/02/2019, 11:30

The discovery of a Higgs boson in 2012 offers a new opportunity to explore physics beyond the Standard Model. Measuring the properties of the discovered Higgs boson and comparing the results to theory predictions can shed light on the underlying theory of nature. High experimental accuracy but also precise theoretical input are needed for this endeavour.

In the talk, I will discuss direct...

43. Precise predictions for the $t\bar{t}\gamma/t\bar{t}$ cross section ratio at the LHC

Giuseppe Bevilacqua (MTA-DE)

26/02/2019, 12:00

We study the ratio of the cross sections for $t\bar{t}\gamma$ and $t\bar{t}$ production at the LHC. We argue that, due to correlations between the theoretical uncertainties in the numerator and in the denominator, a very precise determination of this observable can be achieved at NLO QCD accuracy, with an uncertainty comparable to that of typical NNLO QCD computations. Thus, the ratio has an...

59. Universal four-dimensional representation of $H \to \gamma \gamma$ at two loops through the Loop-Tree Duality

Félix Driencourt-Mangin (IFIC, UV-CSIC)

26/02/2019, 12:30

We extend useful properties of the $H\to\gamma\gamma$ unintegrated dual amplitudes from one- to two-loop level, using the Loop-Tree Duality formalism. In particular, we show that the universality of the functional form - regardless of the nature of the internal particle - still holds at this order. We also present an algorithmic way to renormalise two-loop amplitudes, by locally cancelling the...