Impact of jet veto resummation on slepton searches

Abstract

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.

Sleptons without hadrons

“…Among the several promising lines of such investigations are those that consider the impact of jet vetoes (i.e., the rejection of events featuring jets with a transverse momentum greater than some threshold p Veto T [15- * Electronic address: fuks@lpthe.jussieu.fr † Electronic address: knordstrom@lpthe.jussieu.fr ‡ Electronic address: richard.ruiz@uclouvain.be § Electronic address: sophie.williamson@kit.edu 19]) in measurements of and searches for heavy, colorless SM [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] and beyond the SM [35][36][37][38][39][40][41][42] states. Interestingly, recent studies of multilepton searches for heavy, colorless exotic particles have demonstrated that dynamic jet vetoes can significantly improve discovery potential [41,42].…”

Safe jet vetoes

“…In addition, for color-singlet processes occurring at a mass scale Q, vetoes give rise to logarithmic dependencies on p Veto T of the form α s (p Veto T ) log(Q 2 /p Veto 2 necessary to reproduce EW data. Moreover, the effectiveness of vetoes in searches for new high-mass particles is considerably hindered by the higher predisposition of higher mass objects to generate QCD radiation than lighter objects [15,16].…”

Doubly charged Higgs boson production at hadron colliders

“…Following signifiant improvements in modeling soft jet activity in both color-singlet and QCD processes, the use of jet vetoes in direct searches for new phenomena is becoming increasingly standard at the LHC, as shown, for example, in Refs. [47][48][49][95][96][97]. With the TypeI-ISeesaw libraries it is possible to predict jet veto cross sections for triplet scalars up to NLO+NNLL(veto) using the MadGraph5 aMC@NLO-SCET formalism of Refs.…”