8,950 research outputs found
Collider constraints and new tests of color octet vectors
We analyze the collider sensitivity for new colored resonances in ,
, and final states. While searches in the single production
channel are model-dependent, the pair production rate is model independent and
the existing and searches impose strong constraints on the
relevant branching fractions, where or . We point out the missing,
complementary searches in the mixed decay modes, ,
, and . We propose analysis strategies for
the and decays and find their sensivity
surpasses that of existing searches when the decay widths to tops and light
jets are comparable. If no other decays are present, collective lower limits on
the resonance mass can be set at 1.5~TeV using 37~fb of 13~TeV data.Comment: 22 pages, 3 figures, 2 table
Stellar Wakes from Dark Matter Subhalos
We propose a novel method utilizing stellar kinematic data to detect low-mass
substructure in the Milky Way's dark matter halo. By probing characteristic
wakes that a passing dark matter subhalo leaves in the phase space distribution
of ambient halo stars, we estimate sensitivities down to subhalo masses or below. The detection of such subhalos would have implications
for dark-matter and cosmological models that predict modifications to the
halo-mass function at low halo masses. We develop an analytic formalism for
describing the perturbed stellar phase-space distributions, and we demonstrate
through simulations the ability to detect subhalos using the phase-space model
and a likelihood framework. Our method complements existing methods for
low-mass subhalo searches, such as searches for gaps in stellar streams, in
that we can localize the positions and velocities of the subhalos today.Comment: 6 + 3 pages, 1 + 2 figures, code available at:
https://github.com/bsafdi/stellarWake
Pilk Richard Viidalepa perekonnaloole
Richard Viidalepp (Widebaum before Estonianising his name, and later Viidebaum; Jan. 23, 1904 - June 3, 1986), the famous Estonian folklorist, was born in the Jalapuu farm in the village of Nurmsi in Central Estonia. The same farm was the home of Urve Buschmann, the author of the article and R. Viidalepp's niece. On the basis of the 1722 list of inhabitants in the Särgavere estate and the registers of the Järva Peetri congregation, the documented genealogy of Viidalepp's family starts with Jüri Jalapuu and his wife Els (?1730-?1761). In more recent registers their son Jüri (?1771-1843) already appears under the name Widebaum. The family was a typical Estonian family, including farmers, handicraftsmen, inventive technicians, later also intellectuals and artists. Some emigrated (the Finnish and American branches of the Viidebaums) and some were deported to Siberia. The fate of family members and descriptions of family history are illustrated by Richard Viidalepp's letters and family photographs. The last Viidalepps born in the Jalapuu farm moved to Tallinn in 1950
Der natürliche Fluß und seine Veränderung durch den Menschen : dargestellt am Beispiel Oberweser
Am Beispiel der Oberweser zwischen Beverungen und Holzminden wird die weitestgehende Zerstörung eines natürlichen Flußsystems durch den Menschen aufgezeigt. Die für den Naturzustand typischen Gewässerstrukturen wie Stromspaltungen, Uferabbrüche, Kolke und Flachwasserstellen werden eingehend charakterisiert und die Geschichte ihrer Beseitigung beschrieben. Ein Vergleich zwischen ursprünglicher und heutiger Flußlandschaft verdeutlicht die durch das Wirken des Menschen verursachten tiefgreifenden Veränderungen im "Ökosystem Fluß". Es zeigt sich, daß der wesentliche Eingriff des Menschen auf den Fluß heute darin besteht, daß sich die Wirkungen nacheinander folgender Hochwasser nicht mehr summieren können
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