Resummation prediction on Higgs and vector boson associated production with a jet veto at the LHC

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.

Section: Jhep06(2014)028mentioning

confidence: 82%

Section: Jhep06(2014)028mentioning

confidence: 99%

High precision predictions for exclusive V H production at the LHC

Liu

2014

“…(1.1) can be systematically summed up to all orders in α s . This resummation for jet vetoes in hadronic collisions has been well-developed in the context of Drell-Yan and Higgs production [14,[16][17][18][19][20][21][22][23][24][25][26][27][28][29], and the same methods have also been used to study diboson processes [30][31][32][33][34][35].…”

Section: Jhep07(2016)119mentioning

confidence: 99%

Impact of jet veto resummation on slepton searches

Tackmann

Waalewijn

Zeune

2016

Several searches for new physics at the LHC require a fixed number of signal jets, vetoing events with additional jets from QCD radiation. As the probed scale of new physics gets much larger than the jet-veto scale, such jet vetoes strongly impact the QCD perturbative series, causing nontrivial theoretical uncertainties. We consider slepton pair production with 0 signal jets, for which we perform the resummation of jet-veto logarithms and study its impact. Currently, the experimental exclusion limits take the jet-veto cut into account by extrapolating to the inclusive cross section using parton shower Monte Carlos. Our results indicate that the associated theoretical uncertainties can be large, and when taken into account have a sizeable impact already on present exclusion limits. This is improved by performing the resummation to higher order, which allows us to obtain accurate predictions even for high slepton masses. For the interpretation of the experimental results to benefit from improved theory predictions, it would be useful for the experimental analyses to also provide limits on the unfolded visible 0-jet cross section.

“…However, since gluon 3 must be collinear with gluon 1, θ 13 θ i3 and 12) and thus the eikonal factor reduces to (using the collinear limit)…”

Section: Jhep03(2014)119mentioning

confidence: 99%

“…Exclusive jet cross sections, such as the H + 0-jet cross section in which there are no jets with p T > p cut T , play a key role in channels where the Higgs cannot be reconstructed and jet binning is an effective discriminant between various Standard Model backgrounds. The uncertainty in theoretical predictions of these exclusive jet cross sections can be substantial, and accurately predicting these cross sections and providing robust estimates of their uncertainty is the focus of considerable effort [1][2][3][4][5][6][7][8][9][10][11][12]. A good example is the H → W W * → + − νν channel, where a fixed order analysis of the exclusive 0-jet and 1-jet cross sections have theoretical uncertainties of O(17%) and O(30%) respectively and dominate the systematic uncertainties in the measurement [13,14].…”

Section: Introductionmentioning

confidence: 99%

Jet veto clustering logarithms beyond leading order

Alioli

Walsh

2014

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.