Jet veto clustering logarithms beyond leading order

142

182

As hadron collider physics continues to push the boundaries of precision, it becomes increasingly important to have methods for predicting properties of jets across a broad range of jet radius values R, and in particular for small R. In this paper we resum all leading logarithmic terms, α n s ln n R 2 , in the limit of small R, for a wide variety of observables. These include the inclusive jet spectrum, jet vetoes for Higgs physics and jet substructure tools. Some of the quantities that we consider are relevant also for heavyion collisions. Furthermore, we examine and comment on the underlying order-by-order convergence of the perturbative series for different R values. Our results indicate that small-R effects can be substantial. Phenomenological studies will appear in a forthcoming companion paper.

Section: Jhep04(2015)039contrasting

confidence: 71%

Section: B2 Fixed-order Cross Checksmentioning

confidence: 99%

Small-radius jets to all orders in QCD

Dasgupta

Dreyer

Salam

et al. 2015

142

182

“…A systematic study on the jet veto clustering effects up to O(α 3 s ) in the small-jet-radius limit was carried out in ref. [30].…”

Section: Jhep06(2014)028mentioning

confidence: 99%

High precision predictions for exclusive V H production at the LHC

Liu

2014

We present a resummation-improved prediction for pp → V H + 0 jets at the Large Hadron Collider. We focus on highly-boosted final states in the presence of jet veto to suppress the tt background. In this case, conventional fixed-order calculations are plagued by the existence of large Sudakov logarithms α n s log m (p veto T /Q) for Q ∼ m V + m H which lead to unreliable predictions as well as large theoretical uncertainties, and thus limit the accuracy when comparing experimental measurements to the Standard Model. In this work, we show that the resummation of Sudakov logarithms beyond the next-tonext-to-leading-log accuracy, combined with the next-to-next-to-leading order calculation, reduces the scale uncertainty and stabilizes the perturbative expansion in the region where the vector bosons carry large transverse momentum. Our result improves the precision with which Higgs properties can be determined from LHC measurements using boosted Higgs techniques.

“…(C.1), with tabulated coefficients for n f = 4, 5 in table 7 (the second order coefficient was also calculated in ref. [37]). The quantity t(R 0 , R, p t ) is an integral of the coupling over scales related to the allowed emission angles, defined specifically as…”

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

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 .