101 research outputs found
Multi-W Events at LHC from a Warped Extra Dimension with Custodial Symmetry
Randall-Sundrum models based on SU(2)_L * SU(2)_R with custodial symmetry are
compelling frameworks for building alternative models of electroweak symmetry
breaking. A particular feature of these models is the likely presence of light
Kaluza-Klein fermions related to the right-handed top quark. These can be as
light as a few hundred GeV and still compatible with EW precision constraints.
In this article, we study the detectability of four-W final states at the LHC,
which arise from the pair-production and tW decay of light Kaluza-Klein bottom
quarks as well as light Kaluza-Klein quarks carrying electric charge 5/3.Comment: 17 pages, 26 figure
BlackMax: A black-hole event generator with rotation, recoil, split branes and brane tension
We present a comprehensive black-hole event generator, BlackMax, which
simulates the experimental signatures of microscopic and Planckian black-hole
production and evolution at the LHC in the context of brane world models with
low-scale quantum gravity. The generator is based on phenomenologically
realistic models free of serious problems that plague low-scale gravity, thus
offering more realistic predictions for hadron-hadron colliders. The generator
includes all of the black-hole graybody factors known to date and incorporates
the effects of black-hole rotation, splitting between the fermions, non-zero
brane tension and black-hole recoil due to Hawking radiation (although not all
simultaneously).
The generator can be interfaced with Herwig and Pythia.Comment: 32 pages, 61 figures, webpage
http://www-pnp.physics.ox.ac.uk/~issever/BlackMax/blackmax.htm
Manual of BlackMax, a black-hole event generator with rotation, recoil, split branes, and brane tension
This is the users manual of the black-hole event generator BlackMax, which
simulates the experimental signatures of microscopic and Planckian black-hole
production and evolution at proton-proton, proton-antiproton and
electron-positron colliders in the context of brane world models with low-scale
quantum gravity. The generator is based on phenomenologically realistic models
free of serious problems that plague low-scale gravity. It includes all of the
black-hole gray-body factors known to date and incorporates the effects of
black-hole rotation, splitting between the fermions, non-zero brane tension and
black-hole recoil due to Hawking radiation (although not all simultaneously).Comment: 21 pages, 9 figures, Manual for BlackMax, a black-hole event
generato
Red Supergiant Candidates for Multimessenger Monitoring of the Next Galactic Supernova
We compile a catalog of 598 highly probable and 79 likely red supergiants
(RSGs) of the Milky Way, which represents the largest list of Galactic RSG
candidates to date. We matched distances measured by Gaia DR3, 2MASS
photometry, and a 3D Galactic dust map to obtain luminous bright late-type
stars. Determining the stars' bolometric luminosities and effective
temperatures, we compared to Geneva stellar evolution tracks to determine
likely RSG candidates, and quantified contamination using a catalog of Galactic
AGB in the same luminosity-temperature space. We add details for common or
interesting characteristics of RSG, such as multi-star system membership,
variability, and classification as a runaway. As potential future core-collapse
supernova (SN) progenitors, we studied the ability of the catalog to inform the
Supernova Early Warning System (SNEWS) coincidence network made to automate
pointing, and show that for 3D position estimates made possible by neutrinos,
the number of progenitor candidates can be significantly reduced, improving our
ability to observe the progenitor pre-explosion and the early phases of the
core-collapse supernova.Comment: 21 pages, 10 figures, 5 table. Comments welcom
Ancestral roles of the Fam20C family of secreted protein kinases revealed in C. elegans.
Fam20C is a secreted protein kinase mutated in Raine syndrome, a human skeletal disorder. In vertebrates, bone and enamel proteins are major Fam20C substrates. However, Fam20 kinases are conserved in invertebrates lacking bone and enamel, suggesting other ancestral functions. We show that FAMK-1, the Caenorhabditis elegans Fam20C orthologue, contributes to fertility, embryogenesis, and development. These functions are not fulfilled when FAMK-1 is retained in the early secretory pathway. During embryogenesis, FAMK-1 maintains intercellular partitions and prevents multinucleation; notably, temperature elevation or lowering cortical stiffness reduces requirement for FAMK-1 in these contexts. FAMK-1 is expressed in multiple adult tissues that undergo repeated mechanical strain, and selective expression in the spermatheca restores fertility. Informatic, biochemical, and functional analysis implicate lectins as FAMK-1 substrates. These findings suggest that FAMK-1 phosphorylation of substrates, including lectins, in the late secretory pathway is important in embryonic and tissue contexts where cells are subjected to mechanical strain
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Application of PC's and Linux to the CDF Run II level-3 trigger
For Run II, the CDF Level-3 trigger must provide a sustained input bandwidth of at least 45 MBytes/set and will require processing power of at least 45000 MIPS to perform the necessary reconstruction and filtering of events. We present a distributed, scalable architecture using commod- ity hardware running the Linux operating system. I/O and CPU intensive functions are separated into two types of nodes; �converter� nodes receive event fragments via ATM from Level 2 computers and distribute complete events to �processor� nodes via multiple fast ethernets. We present re- sults from a small-scale prototype roughly equivalent to a 1/16th vertical slice of the final system. With this hardware we have demonstrated the capability of sustained I/O rates of 15 MBytes/set, more then three times the required baseline performance. We discuss PC hardware and Linux software issues and modifications for real time performance
The Habitable Exoplanet Observatory (HabEx) Mission Concept Study Final Report
The Habitable Exoplanet Observatory, or HabEx, has been designed to be the Great Observatory of the 2030s. For the first time in human history, technologies have matured sufficiently to enable an affordable space-based telescope mission capable of discovering and characterizing Earthlike planets orbiting nearby bright sunlike stars in order to search for signs of habitability and biosignatures. Such a mission can also be equipped with instrumentation that will enable broad and exciting general astrophysics and planetary science not possible from current or planned facilities. HabEx is a space telescope with unique imaging and multi-object spectroscopic capabilities at wavelengths ranging from ultraviolet (UV) to near-IR. These capabilities allow for a broad suite of compelling science that cuts across the entire NASA astrophysics portfolio. HabEx has three primary science goals: (1) Seek out nearby worlds and explore their habitability; (2) Map out nearby planetary systems and understand the diversity of the worlds they contain; (3) Enable new explorations of astrophysical systems from our own solar system to external galaxies by extending our reach in the UV through near-IR. This Great Observatory science will be selected through a competed GO program, and will account for about 50% of the HabEx primary mission. The preferred HabEx architecture is a 4m, monolithic, off-axis telescope that is diffraction-limited at 0.4 microns and is in an L2 orbit. HabEx employs two starlight suppression systems: a coronagraph and a starshade, each with their own dedicated instrument
The Habitable Exoplanet Observatory (HabEx) Mission Concept Study Final Report
The Habitable Exoplanet Observatory, or HabEx, has been designed to be the
Great Observatory of the 2030s. For the first time in human history,
technologies have matured sufficiently to enable an affordable space-based
telescope mission capable of discovering and characterizing Earthlike planets
orbiting nearby bright sunlike stars in order to search for signs of
habitability and biosignatures. Such a mission can also be equipped with
instrumentation that will enable broad and exciting general astrophysics and
planetary science not possible from current or planned facilities. HabEx is a
space telescope with unique imaging and multi-object spectroscopic capabilities
at wavelengths ranging from ultraviolet (UV) to near-IR. These capabilities
allow for a broad suite of compelling science that cuts across the entire NASA
astrophysics portfolio. HabEx has three primary science goals: (1) Seek out
nearby worlds and explore their habitability; (2) Map out nearby planetary
systems and understand the diversity of the worlds they contain; (3) Enable new
explorations of astrophysical systems from our own solar system to external
galaxies by extending our reach in the UV through near-IR. This Great
Observatory science will be selected through a competed GO program, and will
account for about 50% of the HabEx primary mission. The preferred HabEx
architecture is a 4m, monolithic, off-axis telescope that is
diffraction-limited at 0.4 microns and is in an L2 orbit. HabEx employs two
starlight suppression systems: a coronagraph and a starshade, each with their
own dedicated instrument.Comment: Full report: 498 pages. Executive Summary: 14 pages. More information
about HabEx can be found here: https://www.jpl.nasa.gov/habex
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