LHC prospects in searches for neutral scalars in pp → γγ + jet

Abstract

At hadron colliders the γγ+jet channel provides larger signal-to-background ratio in comparison with inclusive γγ channel in hunting for scalars uncharged under the SM gauge group. At NLO in QCD perturbation theory we evaluate selfconsistently the signal significance for the SM Higgs boson production in γγ + jet channel at LHC. Three-body final state kinematics allows for refined cuts. The adjustment of these cuts increases the signal significance upto the level of inclusive channel. Applying a justified simple rescaling procedure to the results obtained for SM Higgs boson, we estimate the LHC prospects in searches for radion and sgoldstino in γγ + jet channel. We have found that this channel is comparable with γγ channel in searches for new physics and deserves further detailed investigations. IntroductionWith a lack of deeper understanding of strong interactions, search for signal events in hadron collisions is somewhat ambiguous due to the uncertainties in the prediction of the cross section of background processes. In case of large number of background events the theoretical uncertainties in QCD predictions can result in swamping the signal. Thus at hadron colliders among various channels of the same signal significance the most favorable are those with large signal-to-background ratio.In this paper we study the LHC prospects in searches for Standard Model (SM) Higgs boson, radion and sgoldstino in γγ + jet channel. In comparison with inclusive γγ channel, which has almost the same signal significance, γγ + jet channel exhibits larger signal-to-background ratio and, consequently, stronger possibility to have control over QCD background. Though the signal cross section is smaller in the channel with a high energy jet than in the inclusive channel, rich 3-body kinematics in the final state affords an opportunity to reduce the background significantly.The γγ + jet channel has been extensively investigated as a channel where SM Higgs boson with mass in the range 100 − 140 GeV should be discovered at LHC.

Sgoldstino-Higgs mixing in models with low-scale supersymmetry breaking

“…Among the most interesting signatures of these models are gravitino pair production at particle collisions [26][27][28][29][30][31][32][33] and decays [34][35][36][37], new contributions to FCNC decays of mesons, baryons, heavy quarks and leptons with sgoldstinos in final states [38][39][40][41][42][43]. The collider phenomenology of sgoldstinos with masses at hundred GeV scale has been studied in [44][45][46][47].…”

“…It has been previously studied in refs. [35,[44][45][46][47] but without including effects of its possible mixing with the Higgs boson. As we find this mixing can be extremely important.…”

Monophoton signals in light gravitino production at $$e^+ e^-$$ e + e - colliders

“…Finally, we note that collider signatures of sgoldstinos have been studied in [58][59][60][61][62][63][64][65][66][67][68][69], and our model file can be also applied for such sgoldstino phenomenology. Table 3.…”

On the sgoldstino interpretation of the diphoton excess

“…Interactions of the latter with the Standard Model particles are determined by soft supersymmetry breaking parameters and suppressed by the supersymmetry breaking scale √ F . Collider phenomenology of sgoldstinos with masses of order electroweak scale have been discussed for instance in [10,11,12,13,14,15,16,17,18]. In Refs.…”