Quark masses in Higgs production with a jet veto

Many experimental analyses separate events into exclusive jet bins, using a jet algorithm to cluster the final state and then veto on jets. Jet clustering induces logarithmic dependence on the jet radius R in the cross section for exclusive jet bins, a dependence that is poorly controlled due to the non-global nature of the clustering. At jet radii of experimental interest, the leading order (LO) clustering effects are numerically significant, but the higher order effects are currently unknown. We rectify this situation by calculating the most important part of the next-to-leading order (NLO) clustering logarithms of R for any 0-jet process, which enter as O(α 3 s ) corrections to the cross section. The calculation blends subtraction methods for NLO calculations with factorization properties of QCD and soft-collinear effective theory (SCET). We compare the size of the known LO and new NLO clustering logarithms and find that the impact of the NLO terms on the 0-jet cross section in Higgs production is small. This brings clustering effects under better control and may be used to improve uncertainty estimates on cross sections with a jet veto.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Jet veto clustering logarithms beyond leading order

Alioli

Walsh

2014

“…The core element of our estimate of uncertainty in the jet-vetoed cross section is the JVE method [23]. The premise of the method is that the zero-jet cross section is given by the product of the total cross section and jet-veto efficiency and that the uncertainties in -2 -…”

Section: Updated Jet-veto Efficiency Methods At Fixed Ordermentioning

confidence: 99%

“…The impact of top quark effects on the leading jet's transverse momentum at NLO has been studied through a 1/m t expansion [20]. Different prescriptions have been proposed to include top and bottom effects in analytic resummations [21][22][23] as well as parton-shower simulations, e.g. in (N)NLO+PS generators [24][25][26].…”

Section: Jhep04(2016)049mentioning

confidence: 99%

Jet-vetoed Higgs cross section in gluon fusion at N3LO+NNLL with small-R resummation

Banfi

Caola

Dreyer

et al. 2016

Self Cite

We present new results for the jet-veto efficiency and zero-jet cross section in Higgs production through gluon fusion. We incorporate the N 3 LO corrections to the total cross section, the NNLO corrections to the 1-jet rate, NNLL resummation for the jet p t and LL resummation for the jet radius dependence. Our results include known finite-mass corrections and are obtained using the jet-veto efficiency method, updated relative to earlier work to take into account what has been learnt from the new precision calculations that we include. For 13 TeV collisions and using our default choice for the renormalisation and factorisation scales, µ 0 = m H /2, the matched prediction for the jet-veto efficiency increases the pure N 3 LO prediction by about 2% and the two have comparable uncertainties. Relative to NNLO+NNLL results, the new prediction is 2% smaller and the uncertainty reduces from about 10% to a few percent. Results are also presented for the central scale µ 0 = m H .

“…Very high logarithmic accuracy (N 3 LL) was achieved using Soft Collinear Effective Theory (SCET) for particular event shapes in e + e − collisions [51,52]. Inter-jet radiation and in particular its response to the presence of a jet veto has also received a lot of attention both from the theoretical [53][54][55][56][57][58][59] and experimental [60][61][62][63] communities, primarily in the context of Higgs-boson studies [64][65][66][67][68][69][70]. All-order analytical calculations have been performed recently for an increasing number of jet-substructure observables, including jet masses [71][72][73][74], other jet shapes [75][76][77][78][79], sub-jet multiplicity [80] and grooming algorithms [81][82][83].…”

Section: Jhep02(2015)106mentioning

confidence: 99%

Soft evolution of multi-jet final states

Gerwick

Schumann

Höche

et al. 2015

We present a new framework for computing resummed and matched distributions in processes with many hard QCD jets. The intricate color structure of soft gluon emission at large angles renders resummed calculations highly non-trivial in this case. We automate all ingredients necessary for the color evolution of the soft function at next-toleading-logarithmic accuracy, namely the selection of the color bases and the projections of color operators and Born amplitudes onto those bases. Explicit results for all QCD processes with up to 2 → 5 partons are given. We also devise a new tree-level matching scheme for resummed calculations which exploits a quasi-local subtraction based on the Catani-Seymour dipole formalism. We implement both resummation and matching in the Sherpa event generator. As a proof of concept, we compute the resummed and matched transverse-thrust distribution for hadronic collisions.