99 research outputs found
Prospects for constrained supersymmetry at TeV and TeV proton-proton super-colliders
Discussions are underway for a high-energy proton-proton collider. Two
preliminary ideas are the TeV HE-LHC and the TeV
VLHC. With Bayesian statistics, we calculate the probabilities that the LHC,
HE-LHC and VLHC discover SUSY in the future, assuming that nature is described
by the CMSSM and given the experimental data from the LHC, LUX and Planck. We
find that the LHC with /fb at TeV has a -
probability of discovering SUSY. Should that run fail to discover SUSY, the
probability of discovering SUSY with /fb is merely -. Were SUSY
to remain undetected at the LHC, the HE-LHC would have a - probability
of discovering SUSY with /fb. The VLHC, on the other hand, ought to be
definitive; the probability of it discovering SUSY, assuming that the CMSSM is
the correct model, is .Comment: 21 pages, 5 figures. Matches version published in Eur.Phys.J. C.
Results and conclusions unchange
Examining a right-handed quark mixing matrix with -tags at the LHC
Encouraged by a hint in a search for right-handed bosons at the LHC, we
investigate whether the unitarity of a right-handed quark mixing matrix and the
equality of the left- and right-handed quark mixing matrices could be tested at
the LHC. We propose a particular test, involving counting the numbers of
-tags in the final state, and simulate the test at the event level with
Monte-Carlo tools for the forthcoming TeV LHC run. We find that
testing unitarity with 20/fb will be challenging; our test successfully rejects
unitarity if the right-handed quark mixing matrix is non-unitary, but only in
particular cases. On the other hand, our test may provide the first opportunity
to test the unitarity of a right-handed quark mixing matrix and with 3000/fb
severely constrains possible departures from unitarity in the latter. We refine
our previous work, testing the equality of quark mixing matrices, with full
collider simulation. With 20/fb, we are sensitive to mixing angles as small as
, and with 3000/fb, angles as small as , confirming our
preliminary analysis. We briefly investigate testing the unitarity of the SM
CKM matrix with a similar method by studying semileptonic production,
concluding that systematics make it particularly difficult.Comment: 20 pages, 5 figures, matches version to appear in Nuclear Physics
Is the CNMSSM more credible than the CMSSM?
With Bayesian statistics, we investigate the full parameter space of the
constrained "next-to-minimal" supersymmetric Standard Model (CNMSSM) with
naturalness priors, which were derived in a previous work. In the past, most
Bayesian analyses of the CNMSSM ignored naturalness of the electroweak (EW)
scale by making prejudicial assumptions for parameters defined at the EW scale.
We test the CNMSSM against the CMSSM with Bayesian evidence, which, with
naturalness priors, incorporates a penalty for fine-tuning of the EW scale.
With the evidence, we measure credibility with respect to all measurements,
including the EW scale and LHC direct searches. We find that the evidence in
favor of the CNMSSM versus the CMSSM is "positive" to "strong" but that if one
ignores the -problem, the evidence is "barely worth mentioning" to
"positive." The -problem significantly influences our findings. Unless one
considers the -problem, the evidence in favor of the CNMSSM versus the
CMSSM is at best "positive," which is two grades below "very strong." We,
furthermore, identify the most probable regions of the CMSSM and CNMSSM
parameter spaces and examine prospects for future discovery at hadron
colliders.Comment: 28 pages, 11 color figures. Closely matches version published in
Eur.Phys.J. C. Minor changes to title and abstract, and additional
information about scanning settings. Conclusions unchange
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