Z′ discovery potential at the LHC in the minimal B–L extension of the standard model

Abstract

We present the Large Hadron Collider (LHC) discovery potential in the Z ′ sector of a U (1) B−L enlarged Standard Model (that also includes three heavy Majorana neutrinos and an additional Higgs boson) for √ s = 7, 10 and 14 TeV centre-of-mass (CM) energies, considering both theThe comparison of the (irreducible) backgrounds with the expected backgrounds for the DØ experiment at the Tevatron validates our simulation. We propose an alternative analysis that has the potential to improve the DØ sensitivity. Electrons provide a higher sensitivity to smaller couplings at small Z ′ B−L boson masses than do muons. The resolutions achievable may allow the Z ′ B−L boson width to be measured at smaller masses in the case of electrons in the final state. The run of the LHC at √ s = 7 TeV, assuming at most L ∼ 1 fb −1 , will be able to give similar results to those that will be available soon at the Tevatron in the lower mass region, and to extend them for a heavier M Z ′ .

Sensitivity toZ-prime and nonstandard neutrino interactions from ultralow threshold neutrino-nucleus coherent scattering

“…Still, the coherency boost at very low recoil thresholds can allow for exquisite statistical sensitivity to the Z scale. Projected 95% confidence limits on the Z mass at the √ s = 13/14 TeV LHC with a few (1-3) hundreds of events per femtobarn of luminosity are in the range of 5 to 6 TeV [44,45] for the described benchmark scenarios. Limits for the B − L model go as (6,5,4.4) TeV for couplings g of (0.4,0.2,0.1), respectively.…”

Early (and later) LHC search strategies for broad dimuon resonances

“…The range of invariant masses that we consider is 300 GeV to 4 TeV. 5 We have not included detector smearing effects. A discussion of the effects of including detector smearing and varying the bin size (justifying a binned analysis) is found in the Appendices.…”

“…3 The only rigorous constraint on Z ′ couplings comes from anomaly cancelation requirements. These can be satisfied in myriad ways -for instance, by the presence of hidden exotic states -but the simplest are "minimal models", which consist purely of couplings to the SM plus right-handed neutrinos [3,5]. The minimal models allow us to adequately study the various Z ′ possibilities in a systematic way without introducing too many additional parameters, and we will restrict our attention to these.…”

“…Our analysis follows others who have investigated the LHC reach of Z ′ gauge bosons during the √ s = 7 TeV run with various integrated luminosities [1,2,3,4,5]. We extend these analyses to include searches for RS KK gravitons, and widen the study to include stronglycoupled, broad resonances.…”

Gauge origin ofMparity and theμterm in supersymmetry

“…The reach at the LHC for a B − L Z is studied in Ref. [18] and the effects of SUSY decays are shown in Ref. [19].…”