Search for scalar leptoquarks and T-odd quarks in the acoplanar jet topology using 2.5 fb-1 of p over(p, ̄) collision data at sqrt(s) = 1.96 TeV

TLDR: In this paper, a search for new physics in the acoplanar jet topology has been performed in 2.5 fb(-1) of data from p (p) over bar collisions at root s = 1.96 TeV, recorded by the DO detector at the Fermilab Tevatron Collider.

About: This article is published in Physics Letters B.The article was published on 2008-10-23 and is currently open access. It has received 28 citations till now. The article focuses on the topics: Leptoquark & Tevatron.

Figures

Table 2 For each optimized event selection, information on the signal for which it was optimized (MLQ or (MQ̃ ,MÃH ), and nominal NLO cross section), lower values of HT and /ET selection criteria, the number of events observed, the number of events expected from SM backgrounds, the number of events expected from signal, and the 95% C.L. signal cross section upper limit. The first uncertainty is statistical and the second one is systematic

Fig. 3. For the T-quark search, expected and observed 95% C.L. excluded regions in the Q̃ – ÃH mass plane. The dark shaded region is the observed exclusion for the minimal signal cross section hypothesis. The light shaded band shows the effect on the observed exclusion coming from the theoretical uncertainty on the signal cross section. The full and dotted black lines are the observed and expected limits, respectively, for the nominal cross section hypothesis. The hatched region is excluded by LEP [8]. The region below the horizontal dashed line (MÃH < 80 GeV) is excluded by SM precision measurements [7].

Fig. 2. For the leptoquark search, observed (circles) and expected (triangles) 95% C.L. upper limits on scalar leptoquark production cross sections. The limits obtained with the low mass and high mass selections are shown separately. The nominal production cross sections are also shown for β = 0, with shaded bands corresponding to the PDF and renormalization and factorization scale uncertainties.

Table 1 Number of events observed, expected from background and signal MC simulations, and signal efficiencies for MLQ = 200 GeV at the various stages of the analysis. The QCD multijet contribution is not included in the background contribution. The quoted uncertainties are the combined statistical and systematic uncertainties

Fig. 1. Distribution of the number of jets (a) and distributions of /ET (b) and HT (c) before the final optimization of the cuts on these two quantities; for data (points with error bars), for SM background (full histogram with shaded band corresponding to the total uncertainty), and for signal MC (dashed histogram). The signal drawn corresponds to pair production of scalar leptoquarks with MLQ = 200 GeV.

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The authors thank M. Carena, J. Hubisz, and M. Perelstein for their valuable help with the LHT model, the staffs at Fermilab and collaborating institutions, and acknowledge support from the DOE and NSF (USA); CEA and CNRS/IN2P3 (France); FASI, Rosatom and RFBR (Russia); CNPq, FAPERJ, FAPESP and FUNDUNESP (Brazil); DAE and DST (India); Colciencias (Colombia); CONACyT (Mexico); KRF and KOSEF (Korea); CONICET and UBACyT (Argentina); FOM (The Netherlands); STFC (United Kingdom); MSMT and GACR (Czech Republic); CRC Program, CFI, NSERC and WestGrid Project (Canada); BMBF and DFG (Germany); SFI (Ireland); The SwedishResearch Council (Sweden); CAS and CNSF (China); and the Alexander von Humboldt Foundation (Germany).