Higgs coupling to either the top quark (as in the case of gluon– Lead to a final state involving two Higgs bosons. On λor on new physics effects in general.Īnalogously to single-Higgs production, several channels can Will be needed in order to be able to extract valuable information In any case, precise predictions for rates and distributions Mea-surement of the H H production cross sections will necessitateĬonsiderable integrated luminosity even at 14 TeV centre-of-massĮnergy. So unless new physics produces sizableĮn-hancements (something quite possible in several scenarios), a Unfortu-nately, in the SM the rates for Higgs pair production at the LHC are Possi-bilities for probing higher-dimensional interactions as well as theĮxistence of heavier states coupled to the Higgs. Self-coupling λ, but it also provides one with a wealth of Only it is the simplest production process that is sensitive to the In this context, Higgs pair production could play a key role. Tential, and of where the scale Λcharacterising such an EFT might Therefore provide a key indication of the structure of the scalar Information on the Higgs three- and four-point interactions could Theory (EFT) lagrangian with an SU(2)L × U (1) Y symmetry. Oper-ators of dimension less than or equal to four of an effective field In fact, advantageous) to consider the SM as the subset of Of dark matter) as well as theoretical arguments (such as Raison d’être once experimental indications (such as the existence fixes the value of this self coupling in the scalar potential whoseįorm, in turn, is determined by the global symmetries and the No information, however, has been collected so far The measured couplings toįermions and vector bosons agree within 10–20% with the SM Strengths of the Higgs boson couplings are uniquely determined by Higgs symmetry breaking mechanism of SU(2)L × U (1) Y as Ob-served at the LHC is the one predicted by the Brout–Englert– Present LHC data provide evidence that the scalar particle #5 letter words nlo license#This is an open access article under the CC BY license We show that for allĬhannels in general, and for gluon–gluon fusion and top-pair associated production in particular, NLOĬorrections reduce the theoretical uncertainties, and are needed in order to arrive at reliable predictionsįor total rates as well as for distributions. Is needed in order to improve upon the infinite-top-mass limit, our predictions are obtained in a fullyĪutomatic way within the publicly available framework. With the exception of the gluon–gluon fusion process, for which a special treatment All these results are at the NLOĪccuracy in QCD, and matched to parton showers by means of the method hence, they areįully differential. We present predictions for the SM-Higgs-pair production channels of relevance at the LHC: gluon–gluonįusion, VBF, and top-pair, W, Z and single-top associated production. Torriellid ,Ī PH Department, TH Unit, CERN, CH-1211 Geneva 23, Switzerlandī SLAC, National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025-7090, USAĬ Centre for Cosmology, Particle Physics and Phenomenology (CP3), Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgiumĭ Institut für Theoretische Physik, Universität Zürich, CH-8057 Zürich, SwitzerlandĮ Sorbonne Universités, UPMC Univ. Higgs pair production at the LHC with NLO and parton-shower effects R.
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