Abstract
We present a next-to-leading order accurate simulation of t-channel single-top plus jet production matched to parton showers via the Powheg method. The calculation underlying the simulation is enhanced with a process-specific implementation of the multi-scale improved NLO (Minlo) method, such that it gives physical predictions all through phase space, including regions where the jet additional to the t-channel single-top process is unresolved. We further describe a tuning procedure for the Minlo Sudakov form factor, fitting the coefficient of the first subleading term in its exponent using an artificial neural-network. The latter tuning, implemented as a straightforward event-by-event reweighting, renders the Minlo simulation NLO accurate for t-channel single-top observables, in addition to those of the analogous single-top plus jet process.
Highlights
Is predicted to have a cross section of 832+−4406 pb [4,5,6,7]
We present a next-to-leading order accurate simulation of t-channel single-top plus jet production matched to parton showers via the Powheg method
In this work we have developed a new next-to-leading order (NLO) accurate simulation of t-channel single-top plus jet production, with matching to parton showers via the Powheg method
Summary
Is predicted to have a cross section of 832+−4406 pb [4,5,6,7]. by the end of Run II of the LHC, later this year, 100 million top pairs will have been produced by this mechanism. Experimental analysis of t-channel single-top production is difficult at the LHC due to the large background from ttand W +jets events. Even so, this process has been measured and studied by both ATLAS [22,23,24,25,26,27] and CMS [28,29,30,31,32,33,34] at 7, 8 and 13 TeV. Ground-breaking work in the last four years has seen the accuracy of fixed order perturbative predictions for t-channel single-top production further extended to next-to-next-to-leading order (NNLO) [43,44,45], in the approximation in which one neglects O(αS2) colour suppressed interference terms
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