A
bstract
We describe a proposal to add a set of very forward detectors to the CMS experiment for the high-luminosity era of the Large Hadron Collider to search for beyond the standard model ...long-lived particles, such as dark photons, heavy neutral leptons, axion-like particles, and dark Higgs bosons. The proposed subsystem is called
FACET
for
F
orward-
A
perture
C
MS
E
x
T
ension, and will be sensitive to any particles that can penetrate at least 50 m of magnetized iron and decay in an 18 m long, 1 m diameter vacuum pipe. The decay products will be measured in detectors using identical technology to the planned CMS Phase-2 upgrade.
This is a collection of papers presented by the JEM-EUSO Collaboration at the 38th International Cosmic Ray Conference (Nagoya, Japan, July 26-August 3, 2023)
This review summarizes the state of the art in searches for supersymmetry at colliders on the eve of the Large Hadron Collider era. Supersymmetry is unique among extensions of the standard model in ...being motivated by naturalness, dark matter, and force unification, both with and without gravity. At the same time, weak-scale supersymmetry encompasses a wide range of experimental signals that are also found in many other frameworks. Motivations for supersymmetry are recalled and the various models and their distinctive features are reviewed. Searches for neutral and charged Higgs bosons and standard-model superpartners at the high energy frontier are summarized comprehensively, considering both canonical and noncanonical supersymmetric models, and including results from the LEP collider at CERN, HERA at DESY, and the Fermilab Tevatron.
The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) is designed to accurately observe ultra-high-energy cosmic rays (UHECRs) and cosmic neutrinos from space with sensitivity over the full ...celestial sky. POEMMA will observe the extensive air showers (EASs) from UHECRs and UHE neutrinos above 20 EeV via air fluorescence. Additionally, POEMMA will observe the Cherenkov signal from upward-moving EASs induced by Earth-interacting tau neutrinos above 20 PeV. The POEMMA spacecraft are designed to quickly re-orientate to follow up transient neutrino sources and obtain unparalleled neutrino flux sensitivity. Developed as a NASA Astrophysics Probe-class mission, POEMMA consists of two identical satellites flying in loose formation in 525 km altitude orbits. Each POEMMA instrument incorporates a wide field-of-view (45\(^\circ\)) Schmidt telescope with over 6 m\(^2\) of collecting area. The hybrid focal surface of each telescope includes a fast (1~\(\mu\)s) near-ultraviolet camera for EAS fluorescence observations and an ultrafast (10~ns) optical camera for Cherenkov EAS observations. In a 5-year mission, POEMMA will provide measurements that open new multi-messenger windows onto the most energetic events in the universe, enabling the study of new astrophysics and particle physics at these otherwise inaccessible energies.
The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) is designed to identify the sources of Ultra-High-Energy Cosmic Rays (UHECRs) and to observe cosmic neutrinos, both with full-sky coverage. ...Developed as a NASA Astrophysics Probe-class mission, POEMMA consists of two spacecraft flying in a loose formation at 525 km altitude, 28.5 deg inclination orbits. Each spacecraft hosts a Schmidt telescope with a large collecting area and wide field of view. A novel focal plane is optimized to observe both the UV fluorescence signal from extensive air showers (EASs) and the beamed optical Cherenkov signals from EASs. In POEMMA-stereo fluorescence mode, POEMMA will measure the spectrum, composition, and full-sky distribution of the UHECRs above 20 EeV with high statistics along with remarkable sensitivity to UHE neutrinos. The spacecraft are designed to quickly re-orient to a POEMMA-limb mode to observe neutrino emission from Target-of-Opportunity (ToO) transient astrophysical sources viewed just below the Earth's limb. In this mode, POEMMA will have unique sensitivity to cosmic neutrino tau events above 20 PeV by measuring the upward-moving EASs induced by the decay of the emerging tau leptons following the interactions of neutrino tau inside the Earth.
In southeastern Wyoming, high winds and highly erodible soils can result in serious wind erosion during the transition from
alfalfa to corn. Irrigated corn production into alfalfa sod with no-till ...field preparation using early preplant applied combinations
of cyanazine or metohchlor plus atrazine and dicamba was compared to conventional moldboard plow based field preparation which
employed combinations of cyanazine or metolachlor plus atrazine at planting. Dicamba was applied as needed for alfalfa escapes.
Alfalfa stand was reduced 69% and 98% for no-till and plow systems, respectively. Differences in alfalfa stand reduction did
not impact grain yield. Four year (1987-90) means were 10.5 and 10.0 Mg ha â1 (171 and 162 bu acrt â1 ) for no-till and plow treatments, respectively. The complete removal of alfalfa was not necessary.
Manganese (Mn) is an essential trace element which, upon excessive exposure, produces a neurological syndrome similar to chronic Parkinson's disease in animals and humans. Previous work demonstrated ...that Mn was more potent than other transition metals in stimulating dopamine (DA) auto-oxidation. In these experiments, DA was incubated under physiological conditions in the presence and absence of Mn for up to 60 min. 6-Hydroxydopamine (6-OHDA) was produced in the presence of Mn, while the incubation mixture without Mn showed no DA oxidation. 6-Hydroxydopamine is a neurotoxicant which exerts its effects by destroying DA nerve terminals in the CNS. Therefore, this work suggests that the Mn catalyzed increase in DA auto-oxidation could be linked mechanistically to the appearance of Mn-induced neurotoxic effects.
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