3,092 research outputs found
Collider phenomenology of technihadrons in the Technicolor Straw Man Model
No full textWe discuss the phenomenology of the lightest SU(3)C singlet and nonsinglet technihadrons in the straw man model of low-scale technicolor (TCSM). The technihadrons are assumed to be those arising in top-color-assisted technicolor models in which top-color is broken by technifermion condensates. We improve upon the description of the color-singlet sector presented in our earlier paper introducing the TCSM [K. Lane, Phys. Rev. D 60, 075007 (1999)]. These improvements are most important for subprocess energies well below the masses of the ρT and ωT vector technihadrons and, therefore, apply especially to e^+e^− colliders such as CERN LEP and a low-energy linear collider. In the color-octet sector, we consider mixing of the gluon, the coloron V8 from top-color breaking, and four isosinglet color-octet technirho mesons ρT8. We assume, as expected in walking technicolor, that these ρT8 decay into ¯qq,gg, and gπT final states, but not into πTπT, where πT is a technipion. All the TCSM production and decay processes discussed here are included in the event generator PYTHIA. We present several simulations appropriate for the Fermilab Tevatron collider, and suggest benchmark model lines for further experimental investigation.Published versio
Active Faulting in the Northern Walker Lane and Post-Earthquake Reconnaissance in the Central Walker Lane, Nevada and Eastern California
No full textThe Walker Lane is a region of diverse tectonic activity situated along the Pacific-North American plate boundary. Unmapped and under characterized faults within the northern Walker Lane are associated with large uncertainties in the location and frequency of potential earthquakes in the greater Reno, Nevada metropolitan area. Mapping of primary and secondary earthquake features in post-event studies help understand the location of faulting and amount of damage associated with earthquakes in the central Walker Lane. Two fault systems in the northern Walker Lane are the Petersen Mountain fault located in the North Valleys region of Reno, and the Bonham Ranch fault in the Smoke Creek Desert of Pleistocene Lake Lahontan in the northern Walker Lane. A paleoseismic trench was excavated across the Petersen Mountain fault to document evidence for faulting and determine the timing of earthquake events. Optically stimulated luminescence dating methods were applied to faulted alluvial fan deposits exposed in the trench. For the Bonham Ranch fault, Uncrewed Aerial Vehicle (UAV) flight surveys were conducted in three locations to investigate differences between topographic scarps formed by tectonic displacement and shoreline processes. Cross cutting relations between the different scarp types combined with stratigraphic observations from outcrops were used to assess the timing of tectonic displacement across the fault. Additionally, UAV surveys were conducted during post-earthquake rapid response reconnaissance in the central Walker Lane immediately following the 15 May 2020 M6.4 Monte Cristo, Nevada and 8 July 2021 M6.0 Antelope Valley, California earthquakes. The drone flights assisted ground crews in determining where to look for surface rupture, earthquake secondary effects, and associated damage. These data provided insight into the amount and style of surface deformation immediately following the earthquake events, and the locations of faulting in the central Walker Lane. These studies help answer questions pertaining to the locations and effects of earthquakes in these regions. By incorporating UAV technology into tectonic studies, hi-res aerial images for mapping and Structure From Motion models can be created, and result in a permanent archive of post-earthquake surface damage as well as provide means to measure paleo and modern surface rupture offsets applicable to seismic hazard characterization
Symmetry breaking and generational mixing in top-color-assisted technicolor
No full textFirst author draf
Prenatal care advice to see a dentist: results from a population-based study
No full textMeredith L. Vandermeer (Department of Public Health, Oregon State University), Kenneth D. Rosenberg (Office of Family Health, Oregon Department of Human Services), Alfredo P. Sandoval (Oregon Health & Science University).Title from PDF caption (viewed on August 14, 2020).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Case study in dimensional deconstruction
No full textWe test dimensional deconstruction on a model of Arkani-Hamed, Cohen, and Georgi that is predicted to have a naturally light composite Higgs boson, i.e., one whose mass M is much less than its binding scale Λ, and whose quartic coupling λ is large, so that its vacuum expectation value v∼M/√λ≪Λ also. We consider two different underlying dynamics—UV completions—at the scale Λ for this model. We find that the expectation from dimensional deconstruction is not realized and that low-energy details depend crucially on the UV completion. In one case, M≪Λ and λ≪1; hence, v∼Λ. In the other, λ can be large or small, but then so is M, and v is still O(Λ).First author draf
Charmonium levels near threshold and the narrow state X(3872)->pi(+)pi(-)J/psi
No full textWe explore the influence of open-charm channels on charmonium properties and profile the 1^3D2, 1^3D3, and 2^1P1 charmonium candidates for X(3872). The favored candidates, the 1^3D2 and 1^3D3 levels, both have prominent radiative decays. The 1^3D2 might be visible in the D0D*0 channel, while the dominant decay of the 1^3D3 state should be into D¯D. We propose that additional discrete charmonium levels can be discovered as narrow resonances of charmed and anticharmed mesons.First author draf
Kenneth Burke, music, and rhetoric
No full textMy dissertation focuses on the important but largely unexplored intersection between Kenneth Burke's interest in music and his rhetorical theory. Throughout his life, Burke expressed a deep interest in reviewing, writing, and playing a variety of musical genres, and my examination focuses primarily on music reviews Burke wrote for The Nation in the 1930s, correspondence he kept with friend and musical composer Louis Calabro in 1961, and music journals and compositions Burke wrote throughout his life.^Based on my analysis of these artifacts, my dissertation a) shows how Burke's interest in music substantially influenced his rhetorical ideas; b) reveals a Burkean theory of multimodality through the incorporation of recent multimodal scholars such as Kristie Fleckenstein and Richard Lanham; c) understands Burke's view on nonlinguistic language by aligning him with language theorists such as Susanne Langer and Ernst Cassirer; and finally, d) shows how Burke himself employed rhetorical principles in his musical and multimodal works. In Chapter one, I outline my project, which employs a rhetorical history methodology. This methodology allows me not only to examine historical approaches to multimodality but also to argue for its value in current approaches. Drawing on four of Kenneth Burke's music reviews in The Nation, I argue in Chapter two that the shifting music scene of the 1930s heavily influenced Burke's development of the key concept secular conversion" in Permanence and Change.^In Chapter three, I focus on Burke's later Nation reviews to recreate the important socio-political role music was serving in Burke's rhetorical theory as WW II approached. Chapter four more fully examines Burke's views on music as a symbol system through his 1961 correspondence with Bennington colleague and music composer Louis Calabro. In the final chapter, I shift from examining Burke as a music critic and language theorist to examining Burke the musician and multimodal composer. Burke's musical compositions reveal an enactment his rhetorical theory in a nonlinguistic symbolic system"--Abstract
A composite Higgs model with minimal fine-tuning: the large-N and weak-technicolor limit
No full textWe suggest a criterion to minimize the amount of fine-tuning in a composite Higgs model. The paradigm of this type of model is the top-condensate model of Bardeen-Hill-Lindner. Although “minimally fine-tuned,” this model fails to account correctly for the masses of the top quark and the 125 GeV Higgs boson. We propose a generalization of the Bardeen-Hill-Lindner model that employs finely tuned extended technicolor plus technicolor (TC) interactions. The additional freedom of this model may accommodate both mt(173) and MH(125). This paper studies the large-NTC and -NC limit of this model in which technicolor is weak and does not contribute to electroweak symmetry breaking. Refinements including walking-TC dynamics and a renormalization-group analysis of mt and MH will appear in a subsequent paper. A likely generic signal of this model is enhanced production of longitudinally polarized weak bosons, alone and in association with H(125).I have benefited from many conversations with Chris Hill and others, including T. Appelquist, G. Burdman, R. S. Chivukula, E. Eichten, A. Martin, E. Pilon and B. Zhou. I gratefully acknowledge the support of this project by the Labex ENIGMASS during 2013 and 2014. I also thank Laboratoire d'Annecy-le-Vieux de Physique Theorique (LAPTh) for its hospitality and the CERN Theory Group for support and hospitality during this research. My research is supported in part by the U.S. Department of Energy under Grant No. DE-SC0010106. (Labex ENIGMASS; CERN Theory Group; DE-SC0010106 - U.S. Department of Energy)First author draf
Top quarks and flavor physics
No full textBecause of the top quark’s very large mass, about 175 GeV, it now provides the best window into flavor physics. Thus, pair production of top quarks at the Fermilab Tevatron collider is the best probe of this physics until the CERN Large Hadron collider (LH) turns on in the next century. I discuss aspects of the mass and angular distributions that can be measured in tt¯ production with the coming large data samples from the Tevatron and even larger ones from the LHC.First author draf
CP violation and mixing in technicolor models
No full textVacuum alignment in technicolor models provides an attractive origin for the quarks' CP violation and, possibly, a natural solution for the strong-CP problem of QCD. We discuss these topics in this paper. Then we apply them to determine plausible mixing matrices for left and right-handed quarks. These matrices determine the Cabibbo-Kobayashi-Maskawa matrix as well as new mixing angles and phases that are observable in extended technicolor (ETC) and topcolor (TC2) interactions. We determine the contributions of these new interactions to CP-violating and mixing observables in the K0, Bd and Bs systems. Consistency with mixing and CP violation in the K0 system requires assuming that ETC interactions are electroweak generation-conserving even if technicolor has a walking gauge coupling. Large ETC gauge boson masses and small intergenerational mixing then result in negligibly small ETC contributions to B-meson mixing and CP violation and to Re(ϵ′/ϵ). We confirm our earlier strong lower bounds on TC2 gauge boson masses from Bd–¯¯¯Bd mixing. We then pay special attention to the possibility that current experiments indicate a deviation from standard model expectations of the values of sin2β measured in Bd→J/ψKS, ϕKS, η′KS, and πKS, studying the ability of TC2 to account for these. We also determine the TC2 contribution to ΔMBs and to Re(ϵ′/ϵ), and find them to be appreciable.First author draf
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