1,721,041 research outputs found
Planar master integrals for the two-loop light-fermion electroweak corrections to Higgs plus jet production
No full textWe present the analytic computation of the planar master integrals which occurs in the calculation of the two-loop light fermion electroweak corrections to the production of a Higgs boson in association with a jet in gluon-gluon fusion channel. The complete dependence on the electroweak-boson mass has been taken into account. The evaluation of the master integrals is done using the differential equation method with the canonical basis approach. The solution is given as a series expansion in the dimensional regularization parameter up to weight four. The coefficients in the expansion are given in terms of multiple-polylogarithms
Next-to-leading order corrections to light-quark mixed QCD-EW contributions to Higgs boson production
Full text linkWe present for the first time the exact next-to-leading-order QCD corrections to the light-quark part of the mixed QCD-EW contributions to Higgs production via gluon fusion at the Large Hadron Collider, for a center-of-mass energy of 13 TeV, with exact EW-boson mass dependence. The relevant two-loop real-emission matrix element is computed using a dynamic one-dimensional series expansion strategy whose stability and speed allows for a numerical phase-space integration using local IR subtraction counterterms. For the choice of renormalization (μR) and factorization (μF) scales, μR=μF=MH, we find σgg→H+X(αs2α2+αs3α2)=1.467(2)-14.6%+18.7%(μR var)±2% (PDF) pb, which we use to provide the best result, including an estimate of suppressed contributions: σpp→H+X(EW,best)=2.11±0.28 (theory) pb
Binary mixtures of biomass and inert components in fluidized beds: Experimental and neural network exploration
No full textIn light of the little understanding of the hydrodynamics of multicomponent particle beds involving biomass, a detailed investigation has been performed, which combines well-known experimental and theoretical approaches, relying, respectively, on conventional pressure drop methods and artificial neural network (ANN) techniques. Specific research tasks related to this research includes: i. to experimentally investigate by means of visual observation the mixing and segregation behavior of selected binary mixtures by varying the biomass size and shape as well as the properties (size and density) of the granular solids in cold flow experiments; ii. to carry out a systematic experimental investigation on the effect of the biomass weight and volume fractions on the characteristic velocities (i.e., complete fluidization velocities and minimum slugging velocity) of the investigated binary mixtures in order to select the critical weight fraction of biomass in the mixtures beyond which the fluidization properties deteriorate (e.g., channelling, segregation, slugging); iii. to analyze the results obtained in about 80 cold flow experiments by means of ANN techniques in order to scrutinize the key factors that influence the behavior and the characteristic properties of binary mixtures. Experimental results suggest that the bed components’ density difference prevails over the size difference in determining the mixing/segregation behavior of binary fluidized bed, whereas the velocities of minimum and complete fluidization increased with the increase of the biomass weight fraction in the bed. The training of ANNs demonstrated good performances for both outputs (Umf and Ucf), in particular, best predictions have been obtained for Umf with a MAPE < 4% (R2 = 0.98), while for Ucf the best ANN returned a MAPE of about 7% (R2 = 0.93). The analysis on the importance of single input on ANN predictions confirms the importance of particle density of the bed components. However, unexpected results showed that morphological features of biomass have a limited importance on Ucf
Non-planar two-loop Feynman integrals contributing to Higgs plus jet production
No full textThis is a contribution to the proceedings of the 2018 “Loops and Legs” conference. It is based on a talk by HF on ongoing work on the non-planar Feynman integrals contributing to H + j production at Next-to Leading order in QCD, retaining the complete dependence on the mass of the top-quark. The various non-planar sectors are discussed along with the elliptic structures that appear
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Next-to-leading-order QCD corrections to Higgs production in association with a jet
Full text linkWe compute the next-to-leading-order (NLO) QCD corrections to the Higgs pT distribution in Higgs production in association with a jet via gluon fusion at the LHC, with exact dependence on the mass of the quark circulating in the heavy-quark loops. The NLO corrections are presented including the top-quark mass, and for the first time, the bottom-quark mass as well. Further, besides the on-shell mass scheme, we consider for the first time a running mass renormalisation scheme. The computation is based on amplitudes which are valid for arbitrary heavy-quark masses
Planar master integrals for the two-loop light-fermion electroweak corrections to Higgs plus jet production
Full text linkWe present the analytic calculation of the planar master integrals which contribute to compute the two-loop light-fermion electroweak corrections to the production of a Higgs boson in association with a jet in gluon-gluon fusion. The complete dependence on the electroweak-boson mass is retained. The master integrals are evaluated by means of the differential equations method and the analytic results are expressed in terms of multiple polylogarithms up to weight four
- …
