We present the calculation of the decay Hbbj at next-to-next-to-leading order (NNLO) accuracy in QCD. We treat the bottom quarks as massless with a non-zero Higgs Yukawa coupling y(b). We consider contributions in which the Higgs boson couples directly to bottom quarks, i.e. our predictions are accurate to order O. We calculate the various components needed to construct the NNLO contribution, including an independent calculation of the two-loop amplitudes. We compare our results for the two-loop amplitudes to an existing calculation finding agreement. We present additional checks on our two-loop expression using the known infrared factorization properties as the emitted gluon becomes soft or collinear. We use our results to construct a Monte Carlo implementation of Hbj and present jet rates and differential distributions in the Higgs rest frame using the Durham jet algorithm.
Lin, Joshua
Freytsis, Marat
Moult, Ian
Nachman, Benjamin
High-p(T) Higgs production at hadron colliders provides a direct probe of the internal structure of the gg H loop with the channel at the LHC within the realm of possibility. In order to enhance the sensitivity to this process, we develop a two-stream convolutional neural network, with one stream acting on jet information and one using global event properties. The neural network significantly increases the discovery potential of a Higgs signal, both for high-p(T) Standard Model production as well for possible beyond the Standard Model contributions. Unlike most studies for boosted hadronically decaying massive particles, the boosted Higgs search is unique because double b-tagging rejects nearly all background processes that do not have two hard prongs. In this context which goes beyond state-of-the-art two-prong tagging the network is studied to identify the origin of the additional information leading to the increased significance. The procedures described here are also applicable to related final states where they can be used to identify additional sources of discrimination power that are not being exploited by current techniques.
Cullen, Jonathan M.
Pecjak, Benjamin D.
Scott, Darren J.
We calculate the full set of next-to-leading order (NLO) corrections to h -> b (b) over bar decay in the dimension-6 Standard Model Effective Field Theory (SMEFT). Our calculation forms the basis for precision studies of this decay mode in effective field theory, providing analytic and numerical results for contributions of the 45 dimension-6 operators appearing at NLO. On the technical side, we discuss several complications in NLO SMEFT computations which have not yet been addressed in the literature. These include subtleties in Higgs-Z mixing, electric charge renormalization, and especially the treatment of tadpoles in SMEFT. In particular, we highlight the role of decoupling relations in eliminating potentially large tadpole corrections to the decay rate in hybrid renormalization schemes which employ the (MS) over bar scheme for some Standard Model parameters (such as the b-quark mass and electric charge) and the on-shell scheme for others.
The synthesis of aurachin B, an antibiotic that features a C3-oxygen-substituted quinoline N-oxide nucleus bearing a farnesyl side chain at C4, was accomplished in 60% overall yield from o-nitrotoluene by a concise five-step sequence. An enantioselective synthesis of aurachin H was also achieved for the first time in only two steps from an optically active epoxy iodide.
The synthesis of aurachin B, an antibiotic that features a C3-oxygen-substituted quinoline N-oxide nucleus bearing a farnesyl side chain at C4, was accomplished in 60% overall yield from o-nitro-toluene by a concise five-step sequence. An enantioselective synthesis of aurachin H was also achieved for the first time in only two steps from an optically active epoxy iodide.
Cvetkovic-Ilic, Dragana S.
Mosic, Dijana
Wei, Yimin
In this paper we characterize the sets of all B is an element of B(H) such that A rho B and the sets of all B is an element of B(H) such that B rho A, where A is an element of B(H) is given and rho is an element of {<=3D(-) , <=3D(*) , <=3D(#) , <=3D(circle plus)}. (C) 2015 Elsevier Inc. All rights reserved.