13997029
Lepton jets in (supersymmetric) electroweak processes
We consider some of the recent proposals in which weak-scale dark matter is accompanied by a GeV scale dark sector that could produce spectacular lepton-rich events at the LHC. Since much of the collider phenomenology is only weakly model dependent it is possible to arrive at generic predictions for the discovery potential of future experimental searches. We concentrate on the production of dark states through Z0 bosons and electroweak-inos at the Tevatron or LHC, which are the cleanest channels for probing the dark sector. We properly take into account the effects of dark radiation and dark cascades on the formation of lepton jets. Finally, we present a concrete definition of a lepton jet and suggest several approaches for inclusive experimental searches.
16835697
Anomalies in Fermionic UV Completions of Little Higgs Models
We consider fermionic UV completions of little Higgs models and their associated T-parity-violating anomalous vertices. In particular, we investigate strategies to avoid such parity-violating anomalies. We show that it is unlikely a QCD-like UV completion could be used to implement a model with anomaly-free global symmetry groups. This is because the vacuum state is unlikely to achieve the necessary alignment. However, we will see that certain multi-link moose models, although anomalous, possess a modified form of T-parity that leads to a stable particle. Finally, we briefly discuss a discriminant for detecting anomalous decays at colliders.
125375882
A REVIEW OF SPIN DETERMINATION AT THE LHC
We review the prospects of direct spin determination of new particles which may be discovered at the LHC. We discuss the general framework and the different channels which contain spin information. The experimental challenges associated with such measurements are briefly discussed and the most urgent unresolved problems are emphasized.
123311038
A fifth force and the mediation of supersymmetry breaking
In this talk I will discuss a new mechanism for the mediation of supersymmetry breaking [1]. It relies on the existence of a fifth force, or what is more often refer to as a Z′ gauge‐boson. The existence of supersymmetry and an extra gauge‐boson is well motivated by the type of high‐energy theories (GUT models and string constructions) considered in the literature. The fact that neither has yet been seen is a possible hint that the two are linked and the present work is an attempt at exploring this connection.
14441164
Capture of Inelastic Dark Matter in the Sun
We consider the capture of dark matter in the Sun by inelastic scattering against nuclei as in the inelastic dark matter scenario. We show that, assuming a WIMP-nucleon cross-section of σn = 10−40 cm2 the resulting capture rate and density are sufficiently high so that current bounds on the muon neutrino flux from the Sun rule out any appreciable annihilation branching ratio of WIMPs into W+W−, Z0Z0, τ+τ−, t and neutrinos. Slightly weaker bounds are also available for annihilations into b and c. Annihilations into lighter particles that may produce neutrinos, such as μ+μ−, pions and kaons are unconstrained since those stop in the Sun before decaying. Interestingly enough, this is consistent with some recent proposals motivated by the PAMELA results for the annihilation of WIMPs into light bosons which subsequently decay predominantly into light leptons and pions.
119203743
RECAST — extending the impact of existing analyses
Searches for new physics by experimental collaborations represent a significant investment in time and resources. Often these searches are sensitive to a broader class of models than they were originally designed to test. We aim to extend the impact of existing searches through a technique we call recasting. A framework designed to facilitate the usage of this technique, called RECAST, is presented. We illustrate the issues and subtleties involved through several examples, including new results obtained from the reanalysis of archived LEP data. Website:www.recast.it
121839880
The influence of the nuclear medium on K+ total cross sections
Abstract The study of the K + total cross sections on a wide range of nuclei has revealed important modifications of the free-space K + -nucleon interaction when the nucleon is embedded in a nucleus. Data indicating such an effect were first obtained in a comparison of the total cross sections on carbon and deuterium. In this letter we report new measurements on 6 Li, silicon, and calcium, and demonstrate that the previously reported modifications occur quite generally.