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Articles 31 - 60 of 118
Full-Text Articles in Physical Sciences and Mathematics
A Dynamical Analysis Of The Kepler-80 System Of Five Transiting Planets, Mariah G. Macdonald, Darin A. Ragozzine
A Dynamical Analysis Of The Kepler-80 System Of Five Transiting Planets, Mariah G. Macdonald, Darin A. Ragozzine
Aerospace, Physics, and Space Science Faculty Publications
Kepler has discovered hundreds of systems with multiple transiting exoplanets which hold tremendous potential both individually and collectively for understanding the formation and evolution of planetary systems. Many of these systems consist of multiple small planets with periods less than ~50 days known as Systems with Tightly spaced Inner Planets, or STIPs. One especially intriguing STIP, Kepler-80 (KOI-500), contains five transiting planets: f, d, e, b, and c with periods of 1.0, 3.1, 4.6, 7.1, and 9.5 days, respectively. We provide measurements of transit times and a transit timing variation (TTV) dynamical analysis. We find that TTVs cannot reliably detect …
Search For Two Higgs Bosons In Final States Containing Two Photons And Two Bottom Quarks In Proton-Proton Collisions At 8 Tev, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, Daniel Noonan, Tuhin S. Roy, Francisco X. Yumiceva
Search For Two Higgs Bosons In Final States Containing Two Photons And Two Bottom Quarks In Proton-Proton Collisions At 8 Tev, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, Daniel Noonan, Tuhin S. Roy, Francisco X. Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
A search is presented for the production of two Higgs bosons in final states containing two photons and two bottom quarks. Both resonant and nonresonant hypotheses are investigated. The analyzed data correspond to an integrated luminosity of 19.7 fb-1 of proton-proton collisions at s=8 TeV collected with the CMS detector. Good agreement is observed between data and predictions of the standard model (SM). Upper limits are set at 95% confidence level on the production cross section of new particles and compared to the prediction for the existence of a warped extra dimension. When the decay to two Higgs bosons is …
Search For Higgs Boson Off-Shell Production In Proton-Proton Collisions At 7 And 8 Tev And Derivation Of Constraints On Its Total Decay Width, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Search For Higgs Boson Off-Shell Production In Proton-Proton Collisions At 7 And 8 Tev And Derivation Of Constraints On Its Total Decay Width, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search is presented for the Higgs boson off-shell production in gluon fusion and vector boson fusion processes with the Higgs boson decaying into a W+W− pair and the W bosons decaying leptonically. The data observed in this analysis are used to constrain the Higgs boson total decay width. The analysis is based on the data collected by the CMS experiment at the LHC, corresponding to integrated luminosities of 4.9 fb−1 at a centre-of-mass energy of 7 TeV and 19.4 fb−1 at 8 TeV, respectively. An observed (expected) upper limit on the off-shell Higgs boson event yield normalised to the …
Measurement Of The Differential Cross Sections For Top Quark Pair Production As A Function Of Kinematic Event Variables In Pp Collisions At Square Root Of S = 7 And 8 Tev, V. Khachatryan, A. M. Sirunyan, A. R. Tumasyan, Marc M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, Daniel Noonan, Tuhin S. Roy, Francisco X. Yumiceva
Measurement Of The Differential Cross Sections For Top Quark Pair Production As A Function Of Kinematic Event Variables In Pp Collisions At Square Root Of S = 7 And 8 Tev, V. Khachatryan, A. M. Sirunyan, A. R. Tumasyan, Marc M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, Daniel Noonan, Tuhin S. Roy, Francisco X. Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
Measurements are reported of the normalized differential cross sections for top quark pair production with respect to four kinematic event variables: the missing transverse energy; the scalar sum of the jet transverse momentum (pT); the scalar sum of the pT of all objects in the event; and the pT of leptonically decaying W bosons from top quark decays. The data sample, collected using the CMS detector at the LHC, consists of 5.0 fb-1 of proton-proton collisions at s=7 TeV and 19.7 fb-1 at s=8 TeV. Top quark pair events containing one electron or muon are selected. The results are presented …
Directed Feedback For Simulation-Based Training In Robot-Assisted Minimally Invasive Surgery, Anand Malpani
Directed Feedback For Simulation-Based Training In Robot-Assisted Minimally Invasive Surgery, Anand Malpani
Link Foundation Modeling, Simulation and Training Fellowship Reports
Surgical educators have recommended the need for objective and automated teaching tools for technical skills training. Current training platforms provide automated or manual global assessments that are based on postoperative performance review. Approaches like these lack task segment specific feedback that informs the trainee of where, why and what went wrong that led to the lower performance scores, if at all. Coaching with targeted feedback is crucial not only for new trainees, but also equally critical for experienced surgeons to retain their skills and maintain higher levels of performance. The objective of my thesis project is to develop a virtual …
Search For S Channel Single Top Quark Production In Pp Collisions At √S = 7 And 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Search For S Channel Single Top Quark Production In Pp Collisions At √S = 7 And 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search is presented for single top quark production in the s channel in proton-proton collisions with the CMS detector at the CERN LHC in decay modes of the top quark containing a muon or an electron in the final state. The signal is extracted through a maximum-likelihood fit to the distribution of a multivariate discriminant defined using boosted decision trees to separate the expected signal contribution from background processes. The analysis uses data collected at centre-of-mass energies of 7 and 8 TeV and corresponding to integrated luminosities of 5.1 and 19.7 fb−1, respectively. The measured cross sections of 7.1 …
An Analysis Of The Moisture And Moist Static Energy Budgets In Amip Simulations, Kristine Adelaide Boykin
An Analysis Of The Moisture And Moist Static Energy Budgets In Amip Simulations, Kristine Adelaide Boykin
Theses and Dissertations
An analysis of the second phase of the Atmospheric Model Intercomparison Project (AMIP) simulations has been conducted to understand the physical processes that control precipitation in the tropics. This is achieved primarily through the analysis of the moisture and moist static energy budgets. Overall, there is broad agreement between the simulated and observed precipitation, although specific tropical regions such as the Maritime Continent poses challenges to these simulations. The models in general capture the latitudinal distribution of precipitation and key precipitating regions including the Inter-Tropical Convergence Zone (ITCZ) and the Asian Monsoon. The simulations portrayed the global patterns of evaporation …
Azimuthal Decorrelation Of Jets Widely Separated In Rapidity In Pp Collisions At √S = 7 Tev, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Azimuthal Decorrelation Of Jets Widely Separated In Rapidity In Pp Collisions At √S = 7 Tev, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
The decorrelation in the azimuthal angle between the most forward and the most backward jets (Mueller-Navelet jets) is measured in data collected in pp collisions with the CMS detector at the LHC at s=7 TeV. The measurement is presented in the form of distributions of azimuthal-angle differences, Δϕ, between the Mueller-Navelet jets, the average cosines of (π − Δϕ), 2(π − Δϕ), and 3(π − Δϕ), and ratios of these cosines. The jets are required to have transverse momenta, pT, in excess of 35 GeV and rapidities, |y|, of less than 4.7. The results are presented as a function of …
Azimuthal Decorrelation Of Jets Widely Separated In Rapidity In Pp Collisions At √S = 7 Tev, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Azimuthal Decorrelation Of Jets Widely Separated In Rapidity In Pp Collisions At √S = 7 Tev, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
The decorrelation in the azimuthal angle between the most forward and the most backward jets (Mueller-Navelet jets) is measured in data collected in pp collisions with the CMS detector at the LHC at s=7 TeV. The measurement is presented in the form of distributions of azimuthal-angle differences, Δϕ, between the Mueller-Navelet jets, the average cosines of (π − Δϕ), 2(π − Δϕ), and 3(π − Δϕ), and ratios of these cosines. The jets are required to have transverse momenta, pT, in excess of 35 GeV and rapidities, |y|, of less than 4.7. The results are presented as a function of …
Evidence For Exclusive Γγ → W+ W− Production And Constraints On Anomalous Quartic Gauge Couplings In Pp Collisions At √S = 7 And 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Evidence For Exclusive Γγ → W+ W− Production And Constraints On Anomalous Quartic Gauge Couplings In Pp Collisions At √S = 7 And 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search for exclusive or quasi-exclusive γγ → W+W− production, via pp → p(*)W+W−p(*) → p(*)μ±e∓p(*) at √s = 8 TeV, is reported using data corresponding to an integrated luminosity of 19.7 fb−1. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum pT(μ±e∓) > 30 GeV, and no associated charged particles detected from the same vertex. The 8 TeV results are combined with the previous 7 TeV results (obtained for 5.05 fb−1 of data). In the signal region, 13 (2) events are observed over an expected background of 3.9 ± 0.6 (0.84 ± 0.15) events …
Search For Supersymmetry In Pp Collisions At √S = 13 Tev In The Single-Lepton Final State Using The Sum Of Masses Of Large-Radius Jets, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Search For Supersymmetry In Pp Collisions At √S = 13 Tev In The Single-Lepton Final State Using The Sum Of Masses Of Large-Radius Jets, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
Results are reported from a search for supersymmetric particles in proton-proton collisions in the final state with a single, high transverse momentum lepton; multiple jets, including at least one b-tagged jet; and large missing transverse momentum. The data sample corresponds to an integrated luminosity of 2.3 fb−1 at √s = 13 TeV, recorded by the CMS experiment at the LHC. The search focuses on processes leading to high jet multiplicities, such as gluino pair production with g˜→tt¯χ˜10. The quantity MJ, defined as the sum of the masses of the large-radius jets in the event, is used in conjunction with other …
Measurement Of The T T ¯ Production Cross Section In The Eμ Channel In Proton-Proton Collisions At √S = 7 And 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Measurement Of The T T ¯ Production Cross Section In The Eμ Channel In Proton-Proton Collisions At √S = 7 And 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
The inclusive cross section for top quark pair production is measured in proton-proton collisions at s=7 and 8 TeV, corresponding to 5.0 and 19.7 fb−1, respectively, with the CMS experiment at the LHC. The cross sections are measured in the electron-muon channel using a binned likelihood fit to multi-differential final state distributions related to identified b quark jets and other jets in the event. The measured cross section values are 173.6 ± 2.1(stat)− 4.0 + 4.5(syst) ± 3.8(lumi)pb at s=7 TeV, and 244.9 ± 1.4(stat)− 5.5 + 6.3(syst) ± 6.4(lumi)pb at s=8 TeV, in good agreement with QCD calculations at …
Search For Direct Pair Production Of Scalar Top Quarks In The Single- And Dilepton Channels In Proton-Proton Collisions At √S= 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Search For Direct Pair Production Of Scalar Top Quarks In The Single- And Dilepton Channels In Proton-Proton Collisions At √S= 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
Results are reported from a search for the top squark t ˜ 1, the lighter of the two supersymmetric partners of the top quark. The data sample corresponds to 19.7 fb−1 of proton-proton collisions at s=8 TeV collected with the CMS detector at the LHC. The search targets t˜1→bχ˜1± and t˜1→t(∗)χ˜10 decay modes, where χ˜1± and χ˜10 are the lightest chargino and neutralino, respectively. The reconstructed final state consists of jets, b jets, missing transverse energy, and either one or two leptons. Leading backgrounds are determined from data. No significant excess in data is observed above the expectation from standard …
Surface Cooling Due To Precipitation In The Tropics, Camila Gomes Martins Ramos
Surface Cooling Due To Precipitation In The Tropics, Camila Gomes Martins Ramos
Theses and Dissertations
Precipitation is an important component of the global hydrological cycle. It affects the upper ocean salinity by adding freshwater to the ocean. In addition, precipitation plays a role in cooling the ocean and land surfaces, when the temperature of the raindrops is lower than the temperature of the surface. However, the surface cooling due to precipitation (QP) remains an overlooked feature and is not included in the Intergovernmental Panel on Climate Change (IPCC) models. One might expect that heavy precipitation events may lead to large QP, which can impact the surface temperature, surface energy balance, and local- to regional-scale circulations. …
Simulating Bottom Reflectance Retrievals Using An Analytical Solution For The Two-Flow Irradiance Models, Tyler A. Rotkiske
Simulating Bottom Reflectance Retrievals Using An Analytical Solution For The Two-Flow Irradiance Models, Tyler A. Rotkiske
Theses and Dissertations
Existing analytical solutions to the two-flow irradiance equations are used to obtain new relations for simulating hyperspectral bottom reflectance signatures. Synthetic bottom reflectance signatures are compared to measured bottom reflectance signatures in order to test the model equation limitations of the formulations. Measured hyperspectral bottom reflectance signatures for a dead reef, Elkhorn coral, seagrass and sand, sand, and turtle grass are used. Estimated collimated and diffuse irradiances are inputs needed to run model formulations. Also, specific absorption, specific backscattering coefficients, and water depth for ocean, coastal, and estuarine waters are used as inputs to simulate bottom reflectance retrievals. The specific …
Search For The Associated Production Of A Higgs Boson With A Single Top Quark In Proton-Proton Collisions At √S= 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Search For The Associated Production Of A Higgs Boson With A Single Top Quark In Proton-Proton Collisions At √S= 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
This paper presents the search for the production of a Higgs boson in association with a single top quark (tHq), using data collected in proton-proton collisions at a center-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb−1. The search exploits a variety of Higgs boson decay modes resulting in final states with photons, bottom quarks, and multiple charged leptons, including tau leptons, and employs a variety of multivariate techniques to maximize sensitivity to the signal. The analysis is optimized for the opposite sign of the Yukawa coupling to that in the standard model, corresponding to a …
Search For Pair-Produced Vectorlike B Quarks In Proton-Proton Collisions At Square Root Of S = 8 Tev, V. Khachatryan, A. M. Sirunyan, A. R. Tumasyan, W. Adam, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D. Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva
Search For Pair-Produced Vectorlike B Quarks In Proton-Proton Collisions At Square Root Of S = 8 Tev, V. Khachatryan, A. M. Sirunyan, A. R. Tumasyan, W. Adam, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D. Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
A search for the production of a heavy B quark, having electric charge -1/3 and vector couplings to W, Z, and H bosons, is carried out using proton-proton collision data recorded at the CERN LHC by the CMS experiment, corresponding to an integrated luminosity of 19.7 fb-1. The B quark is assumed to be pair produced and to decay in one of three ways: to tW, bZ, or bH. The search is carried out in final states with one, two, and more than two charged leptons, as well as in fully hadronic final states. Each of the channels in the …
A Deep Search For Additional Satellites Around The Dwarf Planet Haumea, Luke D. Burkhart, Darin Ragozzine, Michael E. Brown
A Deep Search For Additional Satellites Around The Dwarf Planet Haumea, Luke D. Burkhart, Darin Ragozzine, Michael E. Brown
Aerospace, Physics, and Space Science Faculty Publications
Haumea is a dwarf planet with two known satellites, an unusually high spin rate, and a large collisional family, making it one of the most interesting objects in the outer solar system. A fully self-consistent formation scenario responsible for the satellite and family formation is still elusive, but some processes predict the initial formation of many small moons, similar to the small moons recently discovered around Pluto. Deep searches for regular satellites around Kuiper belt objects are difficult due to observational limitations, but Haumea is one of the few for which sufficient data exist. We analyze Hubble Space Telescope (HST) …
Analysis Tools And Defense Mechanisms For Dos Hash Attacks, Pratick Henry Bakhtiani
Analysis Tools And Defense Mechanisms For Dos Hash Attacks, Pratick Henry Bakhtiani
Theses and Dissertations
This thesis focuses on creating tools for the gathering and management of data for analyzing Denial of Service attacks on the advertisement-based synchronization mechanism used in the DirectDemocracyP2P application. In this report we present two tools that were developed as part of this eort: AttackerClient and Decoding and Distribution. These tools are used to perform the attack and analyze the captured network packets of the attack data, storing them in a database. The Decoding and Distribution tool can distinguish between dierent types of messages. It can also assemble fragmented messages from UDP chunks. The created tools help to manage a …
Search For Supersymmetry In Pp Collisions At Square Root Of S = 8 Tev In Final States With Boosted W Bosons And B Jets Using Razor Variables, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, Daniel Noonan, Tuhin S. Roy, Francisco X. Yumiceva
Search For Supersymmetry In Pp Collisions At Square Root Of S = 8 Tev In Final States With Boosted W Bosons And B Jets Using Razor Variables, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, Daniel Noonan, Tuhin S. Roy, Francisco X. Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
A search for supersymmetry in hadronic final states with highly boosted W bosons and b jets is presented, focusing on compressed scenarios. The search is performed using proton-proton collision data at a center-of-mass energy of 8 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 19.7 fb-1. Events containing candidates for hadronic decays of boosted W bosons are identified using jet substructure techniques, and are analyzed using the razor variables MR and R2, which characterize a possible signal as a peak on a smoothly falling background. The observed event yields in the signal regions …
Measurement Of The Top Quark Mass Using Charged Particles In Pp Collisions At Square Root Of S = 8 Tev, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, Daniel Noonan, Tuhin S. Roy, Francisco X. Yumiceva
Measurement Of The Top Quark Mass Using Charged Particles In Pp Collisions At Square Root Of S = 8 Tev, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, Daniel Noonan, Tuhin S. Roy, Francisco X. Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
A novel technique for measuring the mass of the top quark that uses only the kinematic properties of its charged decay products is presented. Top quark pair events with final states with one or two charged leptons and hadronic jets are selected from the data set of 8 TeV proton-proton collisions, corresponding to an integrated luminosity of 19.7 fb-1. By reconstructing secondary vertices inside the selected jets and computing the invariant mass of the system formed by the secondary vertex and an isolated lepton, an observable is constructed that is sensitive to the top quark mass that is expected to …
Dynamic Flaring Non-Potential Fields On Quiet Sun Networks Scales, David L. Chesney, Hakeem M. Oluseyi, Norton B. Orange
Dynamic Flaring Non-Potential Fields On Quiet Sun Networks Scales, David L. Chesney, Hakeem M. Oluseyi, Norton B. Orange
Aerospace, Physics, and Space Science Faculty Publications
We report on the identification of dynamic flaring non-potential structures on quiet Sun (QS) supergranular network scales. Data from the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory allow for the high spatial and temporal resolution of this diverse class of compact structures. The rapidly evolving nonpotential events presented here, with lifetimes <10 minutes, are on the order of 10″ in length. Thus, they contrast significantly with well-known active region (AR) non-potential structures such as high-temperature X-ray and EUV sigmoids (>100″) and micro-sigmoids (>10″) with lifetimes on the order of hours to days. The photospheric magnetic field environment derived from the Helioseismic and Magnetic Imager shows a lack of evidence for these flaring non-potential fields being associated with significant concentrations of bipolar magnetic elements. Of much …
Geological Conditions Required For The Fluvial Erosion Of Titan’S Impact Craters, Rebeca M. Kinser
Geological Conditions Required For The Fluvial Erosion Of Titan’S Impact Craters, Rebeca M. Kinser
Theses and Dissertations
In comparison to other icy satellites, Titan has a small number of impact craters on its surface. Its dense atmosphere screens smaller impactors from the surface, but this alone does not account for the lack of impact craters, especially at large diameters. This suggests that Titan has a relatively young surface and/or erosional processes have effectively removed craters from its surface. For example, fluvial erosion could degrade craters such that they would be unrecognizable from an orbiting spacecraft such as Cassini. The amount of erosion, however, will depend on a number of factors including the geological and meteorological conditions of …
Search For Heavy Majorana Neutrinos In E±E±+ Jets And E±Μ±+ Jets Events In Proton-Proton Collisions At √S = 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Search For Heavy Majorana Neutrinos In E±E±+ Jets And E±Μ±+ Jets Events In Proton-Proton Collisions At √S = 8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search is performed for heavy Majorana neutrinos (N) decaying into a W boson and a lepton using the CMS detector at the Large Hadron Collider. A signature of two jets and either two same sign electrons or a same sign electron-muon pair is searched for using 19.7 fb-1 of data collected during 2012 in proton-proton collisions at a centre-of-mass energy of 8TeV. The data are found to be consistent with the expected standard model (SM) background and, in the context of a Type-1 seesaw mechanism, upper limits are set on the cross section times branching fraction for production of …
Measurement Of Top Quark Polarisation In T-Channel Single Top Quark Production, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Measurement Of Top Quark Polarisation In T-Channel Single Top Quark Production, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A first measurement of the top quark spin asymmetry, sensitive to the top quark polarisation, in t-channel single top quark production is presented. It is based on a sample of pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb−1. A high-purity sample of t-channel single top quark events with an isolated muon is selected. Signal and background components are estimated using a fit to data. A differential cross section measurement, corrected for detector effects, of an angular observable sensitive to the top quark polarisation is performed. The differential distribution is used to …
Double Power Laws In The Event-Integrated Solar Energetic Particle Spectrum, Lulu Zhao, Ming Zhang, Hamid K. Rassoul
Double Power Laws In The Event-Integrated Solar Energetic Particle Spectrum, Lulu Zhao, Ming Zhang, Hamid K. Rassoul
Aerospace, Physics, and Space Science Faculty Publications
A double power law or a power law with exponential rollover at a few to tens of MeV nucleon−1 of the eventintegrated differential spectra has been reported in many solar energetic particle (SEP) events. The rollover energies per nucleon of different elements correlate with a particleʼs charge-to-mass ratio (Q/A). The probable causes are suggested as residing in shock finite lifetimes, shock finite sizes, shock geometry, and an adiabatic cooling effect. In this work, we conduct a numerical simulation to investigate a particleʼs transport process in the inner heliosphere. We solve the focused transport equation using a time-backward Markov stochastic approach. …
Efficient Geometric Probabilities Of Multi-Transiting Exoplanetary Systems From Corbits, Joshua Brakensiek, Darin Ragozzine
Efficient Geometric Probabilities Of Multi-Transiting Exoplanetary Systems From Corbits, Joshua Brakensiek, Darin Ragozzine
Aerospace, Physics, and Space Science Faculty Publications
NASA’s Kepler Space Telescope has successfully discovered thousands of exoplanet candidates using the transit method, including hundreds of stars with multiple transiting planets. In order to estimate the frequency of these valuable systems, it is essential to account for the unique geometric probabilities of detecting multiple transiting extrasolar planets around the same parent star. In order to improve on previous studies that used numerical methods, we have constructed an efficient, semi-analytical algorithm called the Computed Occurrence of Revolving Bodies for the Investigation of Transiting Systems (CORBITS), which, given a collection of conjectured exoplanets orbiting a star, computes the probability that …
Measurement Of The Top Quark Mass Using Proton-Proton Data At Square Root Of (S) = 7 And 8 Tev, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, Daniel Noonan, Tuhin S. Roy, Francisco X. Yumiceva
Measurement Of The Top Quark Mass Using Proton-Proton Data At Square Root Of (S) = 7 And 8 Tev, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, Daniel Noonan, Tuhin S. Roy, Francisco X. Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
A new set of measurements of the top quark mass are presented, based on the proton-proton data recorded by the CMS experiment at the LHC at s=8 TeV corresponding to a luminosity of 19.7 fb-1. The top quark mass is measured using the lepton+jets, all-jets and dilepton decay channels, giving values of 172.35±0.16(stat)±0.48(syst) GeV, 172.32±0.25(stat)±0.59(syst) GeV, and 172.82±0.19(stat)±1.22(syst) GeV, respectively. When combined with the published CMS results at s=7 TeV, they provide a top quark mass measurement of 172.44±0.13(stat)±0.47(syst) GeV. The top quark mass is also studied as a function of the event kinematical properties in the lepton+jets decay channel. …
Erratum To: Comparison Of The Z/Γ* + Jets To Γ + Jets Cross Sections In Pp Collisions At S√=8, The Cms Collaboration, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Marcus Hohlmann, Himali Kalakhety, Darren Mareskas-Palcek, Tuhin Roy, Francisco Yumiceva
Erratum To: Comparison Of The Z/Γ* + Jets To Γ + Jets Cross Sections In Pp Collisions At S√=8, The Cms Collaboration, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Marcus Hohlmann, Himali Kalakhety, Darren Mareskas-Palcek, Tuhin Roy, Francisco Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
An error was found in the published version in the top right plots in figure 2 and figure 3. In both cases the normalization of the photon plots is incorrect by the factor of the luminosity of 19.7. The corrected figures are shown below. The physics conclusion of the paper remains unchanged, since the ratio plots are unaffected.
Reverberation Mapping Of The Dusty Torus In Active Galactic Nuclei, Erich Franz Geisert
Reverberation Mapping Of The Dusty Torus In Active Galactic Nuclei, Erich Franz Geisert
Theses and Dissertations
The Dusty Torus is a structure that is believed to exist in Active Galactic Nuclei. The Torus is physically too small to be spatially resolved, so Reverberation Mapping can be performed in order to replace spatial resolution with temporal resolution, yielding observations that can unravel the mystery of the Dusty Torus. One of the unknowns about the Torus is how the dust is distributed. The two competing theories are that either the dust resides in discrete clouds or that there is a solid wall of dust. This thesis presents the results of a year long observation program, starting in August …