Zobrazeno 1 - 10
of 2 257
pro vyhledávání: '"A. Gröber"'
We investigate models that can induce significant modifications to the couplings of first- and second-generation quarks with Higgs bosons. Specifically, we identify all simplified models featuring two vector-like quark states which can lead to substa
Externí odkaz:
http://arxiv.org/abs/2410.08272
We consider the renormalization group equations within the Standard Model Effective Field Theory and compute two-loop contributions proportional to the top quark Yukawa coupling for the operator generating an effective Higgs-gluon coupling, focusing
Externí odkaz:
http://arxiv.org/abs/2408.03252
Autor:
Di Noi, Stefano, Gröber, Ramona, Heinrich, Gudrun, Lang, Jannis, Scyboz, Ludovic, Vitti, Marco
The calculation of contributions from the chromomagnetic and four-top-quark-operators within Standard Model Effective Field Theory (SMEFT) to Higgs boson pair production in gluon fusion is presented, in combination with NLO QCD corrections. Here we f
Externí odkaz:
http://arxiv.org/abs/2407.04747
We present the virtual corrections due to the top-quark loops for the process $gg \to ZZ$ at next-to-leading order in QCD. The associated two-loop box diagrams are computed using a small-transverse-momentum expansion. Our results are then merged with
Externí odkaz:
http://arxiv.org/abs/2404.15113
Autor:
Di Noi, Stefano, Gröber, Ramona
We present a method which relies on loop contributions from four-top SMEFT operators to single Higgs observables to contrain their Wilson coefficients. Such loop-induced terms have a non-trivial interplay with the extraction of the trilinear Higgs co
Externí odkaz:
http://arxiv.org/abs/2401.05173
Autor:
Di Noi, Stefano, Gröber, Ramona
We study the effects of renormalisation group running of the Wilson coefficients in Standard Model Effective Field Theory, using the process $pp \to t \bar{t}h$ as a showcase. We consider both strong and top Yukawa running effects, since the latter c
Externí odkaz:
http://arxiv.org/abs/2312.11327
We calculate the four-top quark operator contributions to Higgs production via gluon fusion in the Standard Model Effective Field Theory. The four-top operators enter for the first time via two-loop diagrams. Due to their chiral structure they contai
Externí odkaz:
http://arxiv.org/abs/2310.18221
We present a new Monte Carlo code for Higgs boson pair production at next-to-leading order in the POWHEG-BOX Monte Carlo approach. The code is based on analytic results for the two loop virtual corrections which include the full top quark mass depend
Externí odkaz:
http://arxiv.org/abs/2309.10525
Yukawa couplings of the first quark generation are notoriously difficult to constrain due to their small values within the Standard Model. Here we propose Higgs off-shell production, with the Higgs boson decaying to four leptons, as a probe of the up
Externí odkaz:
http://arxiv.org/abs/2304.09772
Autor:
Alasfar, Lina, Cadamuro, Luca, Dimitriadi, Christina, Ferrari, Arnaud, Gröber, Ramona, Heinrich, Gudrun, Carlson, Tom Ingebretsen, Lang, Jannis, Ördek, Serhat, Sánchez, Laura Pereira, Scyboz, Ludovic, Sjölin, Jörgen
Higgs boson pair production is traditionally considered to be of particular interest for a measurement of the trilinear Higgs self-coupling. Yet it can offer insights into other couplings as well, since - in an effective field theory (EFT) parameteri
Externí odkaz:
http://arxiv.org/abs/2304.01968