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Charged fermions below 100 GeV

AbstractHow light can a fermion be if it has unit electric charge? We revisit the lore that LEP robustly excludes charged fermions lighter than about 100 GeV. We review LEP chargino searches, and find them to exclude charged fermions lighter than 90 GeV, assuming a higgsino-like cross section. However, if the charged fermion couples to a new scalar, destructive interference among...

Unification and new particles at the LHC

Precision gauge coupling unification is one of the primary quantitative successes of low energy or split supersymmetry. Preserving this success puts severe restrictions on possible matter and gauge sectors that might appear at collider-accessible energies. In this work we enumerate new gauge sectors which are compatible with unification, consisting of horizontal gauge groups...

A pseudoscalar decaying to photon pairs in the early LHC Run 2 data

In this paper we explore the possibility of a pseudoscalar resonance to account for the 750 GeV diphoton excess observed both at ATLAS and at CMS. We analyze the ingredients needed from the low energy perspective to obtain a sufficiently large diphoton rate to explain the signal while avoiding constraints from other channels. Additionally, we point out composite Higgs models in...

Neutralino dark matter at 14 TeV and 100 TeV

Matthew Low 0 Lian-Tao Wang 0 0 Department of Physics, Enrico Fermi Institute, and Kavli Institute for Cosmological Physics, University of Chicago , Chicago, IL 60637, U.S.A In recent years the

The importance of accounting for larval detectability in mosquito habitat-association studies

Background Mosquito habitat-association studies are an important basis for disease control programmes and/or vector distribution models. However, studies do not explicitly account for incomplete detection during larval presence and abundance surveys, with potential for significant biases because of environmental influences on larval behaviour and sampling efficiency. Methods Data...

Effect of Geolocators on Migration and Subsequent Breeding Performance of a Long-Distance Passerine Migrant

Geolocators are small light-weight data loggers used to track individual migratory routes, and their use has increased exponentially in birds. However, the effects of geolocators on individual performance are still poorly known. We studied geolocator effects on a long-distance migrating passerine bird, the northern wheatear (Oenanthe oenanthe L.). We asked the general question of...

Pileup per particle identification

We propose a new method for pileup mitigation by implementing “pileup per particle identification” (PUPPI). For each particle we first define a local shape α which probes the collinear versus soft diffuse structure in the neighborhood of the particle. The former is indicative of particles originating from the hard scatter and the latter of particles originating from pileup...

The persistence of the snow petrel (Pagodroma nivea) in Dronning Maud Land (Antarctica) for over 37,000 years

Go ran Thor 0 Matthew Low 0 0 G. Thor (&) M. Low Department of Ecology, Swedish University of Agricultural Sciences , PO Box 7044, 750 07 Uppsala, Sweden Two samples of snow petrel Pagodroma nivea

Malaria-Infected Female Collared Flycatchers (Ficedula albicollis) Do Not Pay the Cost of Late Breeding

Life-history theory predicts that the trade-off between parasite defense and other costly traits such as reproduction may be most evident when resources are scarce. The strength of selection that parasites inflict on their host may therefore vary across environmental conditions. Collared flycatchers (Ficedula albicollis) breeding on the Swedish island Öland experience a seasonal...

Food availability and offspring demand influence sex-specific patterns and repeatability of parental provisioning

Few studies have examined interactions between resource availability, life-history traits and sexual conflict on species-specific provisioning rates, and within-individual variation of parental care. To this end, we used 1129 nest observation periods from 118 nests across 4 populations to examine how parental nest visitation varied according to sex, food availability, and...

The energetic cost of mate guarding is correlated with territorial intrusions in the New Zealand stitchbird

Male stitchbirds (hihi) Notiomystis cincta attempt to minimize paternity losses by engaging in intense mate guarding centered on the fertile period of their social mate. While this strategy is directed at preventing intruding extrapair males from successfully achieving forced copulation with their female, it is likely to be energetically costly because of the large amount of time...

Contrast in Edge Vegetation Structure Modifies the Predation Risk of Natural Ground Nests in an Agricultural Landscape

Nest predation risk generally increases nearer forest-field edges in agricultural landscapes. However, few studies test whether differences in edge contrast (i.e. hard versus soft edges based on vegetation structure and height) affect edge-related predation patterns and if such patterns are related to changes in nest conspicuousness between incubation and nestling feeding. Using...