Colliders and cosmology

Olive, Keith A.

doi:10.1140/epjc/s10052-008-0738-8

Cited by 6 publications

(5 citation statements)

References 177 publications

(166 reference statements)

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“…Even within this assumption, these are significant model dependence. Therefore, model independent calculation of π 0 → γ * γ * transition form factor is a valuable step toward the precise test of the Standard Model [9].…”

Section: Introductionmentioning

confidence: 99%

$π^0$ to two-photon decay in lattice QCD

Shintani¹,

Aoki²,

Hashimoto³

et al. 2009

Preprint

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We calculate the neutral pion (π 0 ) to off-shell two photon (γ * γ * ) transition form factor in lattice QCD. The transition form factor can be extracted from the three-point function of the form (axial-vector)-(vector)-(vector) as a function of off-shell two-photon momentum. Since the axialanomaly plays an important role in the π 0 → γγ decay process, we employ the overlap fermion, which preserves the exact chiral symmetery on the lattice. After extrapolating to the chiral and the vanishing photon momentum limit with a fit function based on vector meson dominance (VMD) model, we find that the Adler-Bell-Jackiw anomaly is correctly reproduced.

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Section: Introductionmentioning

confidence: 99%

$π^0$ to two-photon decay in lattice QCD

Shintani¹,

Aoki²,

Hashimoto³

et al. 2009

Preprint

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“…This is a quite common action in supersymmetric models, e.g. precise (g − 2) µ analysis is very important for pinning down parameter space for supersymmetry collider searches [47,48]. These kind of analysis are less popular in GUT models (it is justified if a decoupling of heavy states occurs).…”

Section: Discussionmentioning

confidence: 99%

Left-right symmetry at LHC and precise 1-loop low energy data

Chakrabortty

Gluza

Sevillano

et al. 2012

J. High Energ. Phys.

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Despite many tests, even the Minimal Manifest Left-Right Symmetric Model (MLRSM) has never been ultimately confirmed or falsified. LHC gives a new possibility to test directly the most conservative version of left-right symmetric models at so far not reachable energy scales. If we take into account precise limits on the model which come from low energy processes, like the muon decay, possible LHC signals are strongly limited through the correlations of parameters among heavy neutrinos, heavy gauge bosons and heavy Higgs particles. To illustrate the situation in the context of LHC, we consider the "golden" process pp → e + N . For instance, in a case of degenerate heavy neutrinos and heavy Higgs masses at 15 TeV (in agreement with FCNC bounds) we get σ(pp → e + N ) > 10 fb at √ s = 14 TeV which is consistent with muon decay data for a very limited W 2 masses in the range (3008 GeV, 3040 GeV). Without restrictions coming from the muon data, W 2 masses would be in the range (1.0 TeV, 3.5 TeV). Influence of heavy Higgs particles themselves on the considered LHC process is negligible (the same is true for the light, SM neutral Higgs scalar analog). In the paper decay modes of the right-handed heavy gauge bosons and heavy neutrinos are also discussed. Both scenarios with typical see-saw lightheavy neutrino mixings and the mixings which are independent of heavy neutrino masses are considered. In the second case heavy neutrino decays to the heavy charged gauge bosons not necessarily dominate over decay modes which include only light, SM-like particles.

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“…An alternative option which has attracted much attention in recent years is to take the gravitino as the LSP, another logical possibility within the context of gravity mediated supersymmetry breaking, see for instance. 8 In this presentation we put the focus on a different kind of scenarios where the SUSY breaking and its mediation to the supersymmetric standard model is realized through some gauge interactions, 9-1718-20 The models originating from this class of gauge mediated susy breaking (GMSB) scenarios are phenomenologically as compelling as the gravity mediated ones, and have similar theoretical uncertainties. An important difference however is that here the gravitino is very light and necessarily the LSP, rather than this being a possibility among others.…”

Section: Supersymmetric Extensionsmentioning

confidence: 99%

“…1. Ω non-th G h 2 is often taken as the main source of gravitino abundance in scenarios of gravitino DM with m G > ∼ 150GeV (motivated by gravity mediation), 8 forgetting altogether the uncertainties from Ω th G h 2 . We stress here that in GMSB scenarios one cannot play successfully a similar game since, due to the lightness of the gravitino, the above Ω non-th G h 2 cannot account alone for the observations as illustred in Fig.…”

Section: The Cosmological Set-upmentioning

confidence: 99%