Simulations of supercollider physics

Abstract

The Standard Model of particle physics makes it possible to simulate complete events for physics signatures and their backgrounds in high energy collisions. Knowledge of how the produced particles interact with the materials in a detector makes it possible to simulate the response of any particular detector design to these events and so determine whether the detector could observe the signal. The combination of these techniques has played an important role in the design of new detectors, particularly those for hadron supercolliders where the high rates and small signal cross sections make the experiments very difficult. The technique is reviewed here and illustrated using the simulations of the GEM detector proposed for the Superconducting Super Collider. Although the simulations and results described here are somewhat detector-specific, we believe that they can serve as a useful model for this component of detector design for future hadron supercolliders.

Search for physics beyond the standard model in final states with a lepton and missing transverse energy in proton-proton collisions ats=8 TeV

“…The limit on Λ is calculated to be 11.3 TeV in the electron and 10.9 TeV in the muon channel. In the considered model, the contact interaction must be flavor symmetric for Λ < 500 TeV [2]. Combining both channels, a limit on Λ of 12.4 TeV is observed, and 13.6 TeV is expected.…”

“…It has the same coupling strength to fermions as the W-boson, and its decay width is determined by its mass. Helicity-non-conserving contact interaction model [2] CTEQ6L1 PDFs [48]. A W 0 -boson mass-dependent Kfactor is used to correct for next-to-next-to-leading-order (NNLO) QCD cross sections, calculated using FEWZ [49,50].…”

“…The CI between two quarks, a neutrino, and a charged lepton is described by the helicitynonconserving (HNC) model [2]. The corresponding cross section is σ CI→μν ¼ ðπŝÞ=ð12Λ 4 Þ, whereŝ is the center-ofmass energy of the partons.…”

“…Additionally, events are allowed to include an arbitrary number of jets, as they may originate from initial state radiation. Interpretations of the observations are made in the context of various theoretical models: the sequential standard model (SSM) with a W 0 -boson [1], a helicitynonconserving contact interaction model (HNC-CI) [2], a DM model with a DM particle recoiling against a W-boson [3][4][5], namely the sequential standard model with same-sign couplings (SSMS) and the sequential standard model with opposite-sign couplings (SSMO) [6][7][8], split universal extra dimensions (split-UED) [9,10], and a TeV −1 model [11][12][13][14], the latter two predicting an additional spatial dimension.…”

Non-Resonance Searches with Lepton

“…The combination of electron and muon chan- Figure 3. Another reinterpretation can be done in terms of four-fermion CI of Helicity-Non-Conserving model [11], providing a limit on the preon binding energy scale Λ. The limit on Λ is calculated to be 8.7 TeV as shown in Figure 4.…”