Abstract
We propose a novel technique for the combination of multi-jet merged simulations in the five-flavor scheme with calculations for the production of b-quark associated final states in the four-flavor scheme. We show the equivalence of our algorithm to the FONLL method at the fixed-order and logarithmic accuracy inherent to the matrix-element and parton-shower simulation employed in the multi-jet merging. As a first application we discuss Zbb production at the Large Hadron Collider.
Highlights
Measurements involving heavy-flavor (HF) production are a vital component of the physics program at the Large Hadron Collider (LHC)
Building upon the established merging algorithms for multijet matrix elements and parton showers, we propose a technique to include massive matrix elements for heavy-quark production, effectively leading to an MC simulation in a variable-flavor-number scheme, which we call fusing
The overlap between the five- and four-flavor scheme calculations is removed based on a parton-shower interpretation of the full parton evolution from the hard scale to the parton shower cutoff
Summary
Measurements involving heavy-flavor (HF) production are a vital component of the physics program at the Large Hadron Collider (LHC). To increase the accuracy of heavy-flavor production Monte Carlo samples, two approaches have been studied in the literature: the matching of NLO QCD calculations in the four-flavor scheme (4FS) to parton showers using one of the common NLO þ PS matching formalisms [39,40,41,42,43]. This method has been used to simulate, for example, the pp → Vbb process class [44,45,46,47] and the pp → ttbb process [48,49,50]. V, we demonstrate an implementation of the new method within the Sherpa event generator using pp → Zbbproduction as a test case
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